CA2093193C - Energy supply system - Google Patents
Energy supply systemInfo
- Publication number
- CA2093193C CA2093193C CA002093193A CA2093193A CA2093193C CA 2093193 C CA2093193 C CA 2093193C CA 002093193 A CA002093193 A CA 002093193A CA 2093193 A CA2093193 A CA 2093193A CA 2093193 C CA2093193 C CA 2093193C
- Authority
- CA
- Canada
- Prior art keywords
- power
- heat
- energy supply
- supply system
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
- H01M8/0612—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants from carbon-containing material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/008—Systems for storing electric energy using hydrogen as energy vector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/40—Combination of fuel cells with other energy production systems
- H01M2250/402—Combination of fuel cell with other electric generators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/40—Combination of fuel cells with other energy production systems
- H01M2250/405—Cogeneration of heat or hot water
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04037—Electrical heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/10—Applications of fuel cells in buildings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
An energy supply system for supplying, in system interconnection, power received at a power receiving equipment from a power plant and power generated by a fuel cell to a power consuming installation, and supplying heat generated by the fuel cell to a heat consuming installation. This system includes an operation amount computing device for computing an amount of operation of the fuel cell to minimize an equation y=aXL+bXM+cXN, in response to an energy demand of the power consuming installation and heat consuming installation. A control device controls the fuel cell to satisfy the amount of operation computed. The system supplies energy in optimal conditions with respect to the cost borne by an energy consumer, consumption of primary energy, and release of environmental pollutants.
Energy is effectively used from the standpoint of the energy consumer and a national point of view.
Energy is effectively used from the standpoint of the energy consumer and a national point of view.
Description
ENERGY SUPPLY SYSTEM
BACKGROUND OF THE INVENTION
(1 ) Field of the Invention The present invention relates to an energy supply system for supplying energy in an optimal condition to energy consumers for consumption of heat and elect~icity in heating water, cooking, lighting, cooling and heating spaces, and operating apparatus and equipment for various other purposes.
BACKGROUND OF THE INVENTION
(1 ) Field of the Invention The present invention relates to an energy supply system for supplying energy in an optimal condition to energy consumers for consumption of heat and elect~icity in heating water, cooking, lighting, cooling and heating spaces, and operating apparatus and equipment for various other purposes.
(2) Description of the Prior Art l 0 In supplying heat and electricity as noted above, heat is produced mainly by burning a gas while electricity is transmitled from power plants. With the diffusion of air-conditioners, the demand for commercial electricity reaches itsmaximum during the hours from 11:00 to 17:00 in summer. Electric power companies must install power generating cquipment and transmitting 1 5 equipment to meet the peak power demand during such a short time in such a brief period of the year.
However, difficulties have been encounlerQd in bullding new power plarlls in that local communities tend to oppose thermal power plants mainly on the grounds of the problem of pollu~ion, and nuclear power plants mainly from 2 0 the safety point of view. Power use patterns fluctuate throughout the year, with the consurnption maximizing during a limited period of time in summer.
~.
Even if new power plants are built, the annual availability factor is very low.
Consequently, it is uneconomical since new power plants will have an extremely low use efficiency for the plant investment required.
On the other hand, the demand for lown gas reaches Its maximum in winter and its minimum in summer. Town gas companies must install production equipment and supply equipment to meet the maximum demand in winter. Such equipment suffers a very low availability factor through the 5 year, particularly in summer.
Thus, there is a need for development of an energy supply system, which will allow power companies and town gas companies to make effective use of their respective facilities.
Systems for supplying energy to such energy consumers who consume 1 0 heat and electricity include what is known as a cogeneration system. The cogeneration system supplies commercial electric power (the power supplied from power suppliers for payment), the power obtained by driving a generator with a gas engine or gas turbine, and the waste heat from these machines.
The above cogeneration system has a high energy use efficiency to provide the advantages of low energy cost, reduced contract demand and leveled quantity of electricity. However, only an operation to minimize fuel consumption or a rated operation has been kept in view in driving the generator with the gas engines or gas turbines. The syslem has not been 2 0 run, taking efficiency of the entire system into account, or from a national point of view.
SUMMARY OF THE INVENTION
The present invention has been made having regard to the state of the art 2 5 noted above. An object of the present invention, therefore, is to provide an energy supply syslem which makes effective use of energy and takes preservation of the environment into account from a consumers' standpoint as well as a national point of view.
Other objects of the invention will be apparent ~rom the following 5 description.
The above object is fulfilled, according to the present invention, by an energy supply system having a power receiving equipment for receiving electric power from a power plant, an in-system power generating device for generating power and heat by using at least some fuel received at a fuel 10 receiving device, a power supplying device for supplying, in system interconnection, the power received at the power receiving equipment and the power generated by the in-system power generating device to a power consuming installation, and a heat supplying device for supplying the heat generated by the in-system power generating device to a heat consuming 15 installation. The energy supply system comprises an amount of operation computing device for computing an amount of operation of the in-system power generating device to minimize an equation "y" set out hereunder when meeting an energy demand of an energy consumer, and a control device for controlling the in-system power generating device to satisfy the amount of 2 0 operation computed by the amount of operation computing device;
y = a XL +b XM +c XN , where "a", "b" and "c" are weighting coefficients a >=0, b >=0 and c >=0, which do not become zero at the same time, the coefficients "a", "b" and "c" being 2 5 determinable by an assessor according to a selected mode of assessment, but a XL, b XM and c XN being impossible to assess without being placed in the order as in the embodimen~ since "L", "M" and "N" are different in order and unit, "L" is an energy cost borne by the energy consumer when the energy S demand is met, "M" is a calculated total quantity of primary energy consumed to meet lhe energy demand, and "N" is a calculated total quantity of environmental pollutants released when the energy demand is met.
With the energy supply system according to the present invention, the control device controls the in-system power generating device to operate in an optimal condition with respect to the cost borne by the energy consumer, consumption of primary energy, and release of environmental pollutants. In this way, the energy consumer requiring heat and electricity is supplied with 1 5 a necessary quantity of heat and an appropriate quantity of electricity. In the process of supplying the heat and power, the power obtained through generation of the heat is added to the power received from the power plant.
Thus, with the energy supply system according to the present invention, the in-system power generating device is operable in an optimal condition 2 0 with respect to the cost borne by the energy consumer, consumption of primary energy, and release of environmental pollutants, to supply heat and power to the energy consumer. This system is capable of a comprehensive improvement in energy efficiency not only with the in-system power generating device but with addition of commercial electricity. This system 2 S lightens the burden on the energy consumer, lessens the necessity for new generating and transmitting facilities, and reduces release of environmental pollutants. That is, this energy supply system realizes effective use of energy from the standpoint of the energy consumer and from a national point of view, while contributing toward preservation of the environment.
The energy supply system according to the present invention may further comprise an in-system heat generating device besides the in-system power generating device, wherein the heat generated by the in-system heat generating device also is supplied to the heat consuming installation.
The in-system heat generating device is operable to supply heat in the 1 0 event of a regular or temporary increase in the heat demand. This allows the in-system power generating device to have a reduced size, thereby enabling an economical system design and operation.
The heat generated by the in-system heat generating device is used when the heat demand increases temporarily and the heat load of the heat 1 5 consuming installation exceeds the quantity of heat available from the in-system power generating device. This is economical in that a small in-system power generating device is sufficient, instead of necessitating an in-system power generating device capable of meeting a maximum heat demand.
2 0 The energy supply system according to the present invention may further comprise a combustible gas receiving device, wherein a customer heat consuming installation is provided as an energy consuming installation of the energy consumer to use as a heat source a combustible gas received at the combustible gas receiving device and/or the power or the heat, the energy 2 5 demand including a demand of the customer heat consuming installation.
20931g3 With this construction, the system may be oplimized from economic and national points of view also where the energy consumer has a consuming installation which directly uses a combustible gas as a heat source.
Where the energy consumer has an energy consuming installation 5 adapted to use power, heat and combustible gas, an optimal amount of operation of the in-system power generating device may be computed after determining a priority order of use.
Then, the in-system power generating device is operated in the cornputed optimal amount. The energy cor-suming installations of the energy consumer 10 are driven under this condition and under central control (a local control being possible where little load variation occurs).
Thus, the optimization may include the energy consuming installations adapted to use power and heat as well.
The consumption of primary energy refers to consumption at the power 15 plant, the in-system power generating device, and combustible gas consuming equipment (excluding the in-system power genera~ing device) to meet the energy demand of the enorgy consumer. Ths combustible gas consuming equipment refers generally to equipment such as a boiler or other in-system heat generating device (not including the in-system power 2 0 generating device) and the energy consumer's dryer or other customer heat consuming installation that consumes a combustible gas. However, these pieces of equipment may be replaced with the customer heat consuming installation for the sake of simplicity.
The electric power consuming installation refers to an installation that 2 5 uses AC and/or DC.
The heat consuming inslallation refers to an installation that uses warm water and/or steam. Warm water andlor steam are used for directly supplying warm water or as heat source for heating spaces or for an absorption heater/cooler, or as heat source for chemical or mechanical 5 equipment.
The energy demand refers to demands for electric power and heat. The energy demand may be determined by a well-known method. That is, electric power may be measured with a wattmeter. Heat may be measured by W X(lo -Ir ) in the case of a recirculating syslem where a warm fluid is 1 0 supplied from a fuel cell and relurned thereto after its heat is radiated from a heat consuming installation.
In the above expression, "W" is a flow rate of the warm fluid (kglh), and "I!' is an enthalpy (kcal/kg). IF the fluid undergoes no phase change and no change in specific heat "C" (kcal/kgC), W XC X( To -Tr ), where "T" is a 1 S temperature (C), is established. The subscript "o" represents an output from the energy supply system, and the subscript "r" a return from the energy supply system.
Primary energy includes fossil energy such as LNG (liquefied natural gas), coal and petroleum, atomic energy such as uranium, and hydraulic energy 2 0 from a hydropower generating plant.
Where only fossil fuels such as LNG, naphtha, heavy oil and coal are considered, and a plurality of such fuels are used, "M", or consumption of primary energy, may be evaluated in ~erms of one of the fuels. The conversion may be based on calories, weighting according to fuel qualities, 2 5 or purchase prices. When evaluating nuclear power generation also, a fissionable material may be converted for equivalence to LNG with respect to cost or the like. Selection of the fuel for use in the evaluation is arbitrary.
Primary energy consumption at a hydropower generating plant normally is negligible.
"N", or environmenlal pollu~an~s, may be exemplified by C02, NOx and SOx. Assess,oent thereof may be made by N = W1 [C02I + W2[NOxI +
W3[SOxI, where W1, W2 and W3 are weighting coefficients. When only C02 is considered, the coefficients may be W1=1, W2=0 and W3-0. When only NOx is considered, the coefficients may be W1=0, W2=l and W3=0. When 1 0 only SOx is considered, the coefficients may be Wl=O, W2=0 and W3=1.
The pollutant for use in the assessment may be selected according to circumstances.
The system may be constructed and controlled with the above expression "y" modified as y=aXL, i.e. taking only energy cost into account. In this case, 1 5 heat and electricity may be supplied to the energy consumer to meet its energy demand in such a way as to minimize the cost borne by the energy consumer.
Thus, it is exceedingly economical in that the energy demand is met with a minimum cost borne by the energy consumer.
2 0 The system may be constructed and controlled with the above expression "y" modified as y--bXM, i.e. taking only a total consumption of primary energy into account. In this case, heat and electrici~y may be supplied to the energy consumer to meet its energy demand in such a way as to minimize a calculated total quantily of primary energy consumption including quantities 20931~3 of primary energy consumed at the power plant, in-system power generating devices and combustible gas consuming equipment.
Since the energy demand ;s met in such a way as to minimize a calculated total quantity of primary energy consumption including quantities 5 of prirnary energy consumed at the power plant, in-system power generating devices and the like, energy sources and other resources may be saved significantly at the national level.
The system may be constructed and controlled with the above expression "y" modified as y-cXN, i.e. taking only a total release quantity of I O environmer~al pollutants into accoùnt. In this case, heat and electricity may be supplied to the energy consumer to meet its energy demand in such a way as to minimize a calculated total quantity of environmental pollutants including quantities of environmental pollutants released from the power plant, in-system power generating devices and combustible gas consuming 1 5 equipment.
Since the energy demand is met in such a way as to minimize a calculated total quantity of environmental pollutants including quantities of environmental pollutants released from the power plant, in-system power generating devices and the like, environmental pollution may be prevented 2 0 on global scale.
The system may be constructed and controlled with regard to y=aXL+bXM, y=bXM+cXN, or y=aXL+cXN. These are all special cases included in the invention considering y=aXL+bXM+cXN. In these special cases, y=aXL+bXM+cXN may be set to the system, with zero assigned to an g unnecessary coé`fficient or coefficients, or an expression not including an unused term may be stored in memory in advance.
The in-system power generating device may comprise a fuel cell for producing electric power and heat, or an apparatus for producing power and S heat by using a gas engine or gas turbine to drive a generalor.
The fuel cell may be the phosphate type, solid electrolyte type or fused carbonate type. The phosphate type, which causes a reaction between hydrogen and oxygen, has already been put to practical use and may be applied directly to this system.
Normally, this in-system power generating device is installed adjacen~ to a site of energy consumption by the energy consumer.
In recent years, progress has been made in the research on the phosphate type fuel cell which uses hydrogen and oxygen as raw materials to output electric power and waste heat. A fuel cell outputting approximately 1 5 200kw has reached the stage of practical use. With respect to input energy, the power plant is about 40% efficient, while the fuel cell has a power generating efficiency of about 40% and a heat generating efficiency of about 40/0. Thus, the fuel cell is attracting attention as a new energy supply system. With the fuel cell used as the in-system power generating device, 2 0 the energy consumer may be supplied with the heat obtained from the fuel cell and the power oblained from the fuel cell and power plant.
Where the in-system power generating device uses a gas engine or gas turbine to drive a generator for generating power and heat, its main component is the gas engine or gas turbine which has a rough and severe 2 5 drive. This gives rise to the a number of disadvantages such as its operation .
209~193 requires careful attention, ils maintenance requires skill, its generating efficiency is low, and it produces NOx. These disadvantages are diminished where a fuel cell is used as the in-system power generating device as noted above. In addition, the fuel cell produces water from the reaction between 5 hydrogen and oxygen, and this water may also be used to advantage.
The energy supply system may further comprise a heat storage for storing, in the form of warm water, superfluous heat generated by the in-system power generating device, and a heat replenishing device for supplying the heat stored in the storage device to the heat consuming installation at a time 10 of heat shortage. Where a rated capacity of the in-system power generating device is determined from a heat load, the in-system power generating device may have a reduced rated capacity since the heat load is leveled.
Thus, the heat made superfluous at normal times may be stored for use when the heat demand temporarily increases. This is economical in that a 15 small in-system power generating device is sufficient, instead of necessitating an in-system power generating device capable of meeting a maximum heat demand.
Heat shortages may be covered by thermal conversion of superfluous electric power, such as by using a heater or other electricity-to-heat 2 0 converting device.
Then, the heat obtained from the thermal conversion of superfluous power by the electricity-to-heat converting device is supplemented when the heat demand temporarily increases and the heat load of the heat consuming equipment becomes greater than the heat available from the in-system 2 5 power generator device. This is economical in that a small in-system power ` ` 20q3 I q3 generating device is sufficient, instead of necessit~ g~ in-system power generating device capable of meeting a maximum heat demand.
The energy supply system may further comprise a power storage for storing the power supplied from the power receiving equipment or part of the power generated by the in-system power generating device at a time of low power demand, and a power replenishing device for supplying the power stored in the power storage to the power cor~suming installation. This enables leveling of a demand for commercial electricity. Where a rated capacity of the fuel cell is determined from a power load, the fuel cell may have a reduced rated capacity.
Thus, the power stored in the power storage may be used to compensate for a shortage when the power demand temporarily increases. This is economical in that sufficient power to meet a maximum power demand need not be received at the power receiving equipment, thereby achieving a reduced contract demand.
The energy supply system may further comprise a back-current device for causing a back current of part of the power generated by the in-system power generating device to the external power plant when the power generated by the in-system power generating device exceeds a power demand.
2 0 With this construction, when heat is in great demand and superfluous power is generated by the in-system power generating device, the power may be transmitted in the back current to the external power plant for effective use. This improves the energy efficiency of the entire system to contribute toward promotion of the national economy.
Hydrogen gas may be received at a fuel gas receiving device to be used as the fuel for the fuel cell. However, it is more economical to receive a hydrocarbon fuel (e.g. methane, propane or butane) at the fuel receiving device, and produce hydrogen gas therefrom at a ref.ormer to be used as the 5 fuel for the fuel cell.
When the hydrocarbon fuel is used to operate the fuel cell, hydrogen gas may be obtained from the reformer to be used as the fuel for the fuel cell.
Thus, it is sufficient to supply the hydrocarbon fuel for operation of the fuel cell, which promotes applicability.
1 0 The energy supply system may further comprise a gas storage for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power when the fuel cell is driven in a high-load condition to meet a thermal demand though electric power is superfluous. The hydrogen gas stored may be supplied to 15 the fuel cell.
Where a hydrocarbon fuel is received as the fuel for the fuel cell, this may be used as a raw material for producing hydrogen gas at the reformer. The hydrogen gas produced may be supplied lo the fuel cell.
Then, the hydrogen gas generated by superfluous power may be stored in 2 0 the gas storage to be used as the fuel for the in-system power generating device. This allows a reduced quantity of fuel to be received at the fuel receiving device, thereby saving resources.
The hydrogen gas produced by reforming hydrocarbon may be stored for use at high load times.
The energy supply system may further comprise a solar cell connected to the power consuming installation. Thus, power obtained therefrom may be supplied to the power consuming instailation.
Since the power obtained from the solar cell is supplied to the power 5 consuming installation, a si~nificant reduction is achieved in the quantity ofpower received at the power receiving installation and in the quantity of power to be obtained from the in-system power generating device.
BRIEF Di--SCRlPTlON OF THE DRAWINGS
1 0 For the purpose of illustrating the invention, there are shown in the drawings several forms which are presen~ly preferred, it being understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.
Fig. 1 is a block diagram of an energy supply system according to the 15 present invention.
Fig. Z is a block diagram of a control system.
Fig. 3 is a graph showing a correlalion between an overall index and an amount of operation of a fuel cell.
Fig. 4 is a graph showing a heat energy demand pattern in a comparative 2 0 example.
Fig. 5 is a graph showing electricity demand patterns in the comparative example.
Fig. 6 is a graph showing an operating pattern of the fuel cell.
Fig. 7 is a graph showing a pattern of commercial electricity intake.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present inven~ion for supplying energy in an optimal manner will be described with reference to an embodiment as illustrated in the drawings.
However, the technical scope of the invention is not limited to this embodiment.
Referring to the block diagram in Fig. 1, an energy consumer has an electric power consuming installation 3 including a group of DC equipment 1, a group of AC equipment 2, and an electric heater/cooler 4a which is one type of AC equipment; a heat consuming installation 6 including an absorption heater/cooler 4b and a water bath 5; and a customer heat consuming installation 52 such as a dryer using a combustible gas, power or heat as a heat source. Energy is supplied to the consumer from an energy box 7 having an energy supply system according to the present invention.
The energy box 7 herein refers to a combination of a piece of power 1 5 receiving equipment 8, a fuel receiving device 9, an in-system power generator 10 such as a fuel cell, an in-system heat generator such as a boiler, a computer 11 acting as a computing device, and a control unit, which combination forms the core of the present invention. These devices are not necessarily contained in a box or a chamber.
2 0 Electricity is transmitted from an external power plant to the power receiving equipment 8 having a wattmeter (not shown), a circuit breaker and the like. The group of AC equipment 2 is connected to the power receiving equipment 8 through system wiring 13a and l 3d. The group of DC
equipment 1 is connected to the power receiving equipment 8 through a 2 5 system wiring 13e having an AC-to-DC converter 14.
Town gas having methane as its main component is received at the fuel receiving device 9 having a gas meter (not shown~, a cutoff valve and the like. The town gas received is reformed into hydrogen gas by using water vapor in the presence of a catalyst. The town gas may be used also as a fuel for heating a reformer 15 and as a boiler fuel as described hereinafter. The hydrogen gas obtained is supplied to a fuel eleclrode of the fuel cell 10 through a flow regulator valve 17. ~he fuel cell lO receives air at an air electrode thereof from an air blower (not shown). The fuel cell 10 generates electricity through a reaction between hydrogen and oxygen. At the same l O time, water is collected (though not shown) while heat is collected in the foJm of warm water and/or vapor by an waste heat collector 19.
The fuel cell 10 has an output wiring 13b connected to a DC-to-AC
inverter 20. The inverter 20 is connected through a system wiring 13c to the system wiring 13a. Thus, the power output of the fuel cell 10 is in system l S interconnection with the power received by the power receiving equipment 8.
This provides a power supplying device for supplying the power generated by the fuel cell 10 to the power consuming installa~ion 3. The power outpu~ of the fuel cell 10 may be supplied to ~he DC consuming equipmen~ without passing it through the inverter.
2 0 This system interconnection, when ~he power generated by the fuel cell 10 exceeds a power demand of the power consuming installation 3, allows part of the power generated by the fuel cell 10 to be flowed back to a commercial power supplier.
At times of low power demand, superfluous power may be used in 2 5 electrolysis of water to generate hydr~gen gas and oxygen gas. This 21)93193 hydrogen gas may be s~ored in a gas storage 22 to be used as a fuel for the fuel cell 10. This is effective when it is difficult to operate the fuel cell 10under a low load condition or when the back-current to the power supplier is difficult for various reasons.
S Further, a power storage (not shown) may be connected to the output wiring 13b to store superfluous power for use at times of power shortage.
The waste heat collector 19 and absorption heater/cooler 4b are interconnected through a vapor collecting piping 26a and a condensed water re~urn piping 26b. Thus, heating and cooling are effected by means of the I 0 vapor obtained from the waste heat collector 19. A boiler 28 is connected to the vapor collecting piping 26a through a second control valve 27a. Thus, when a heat load of the absorption heater/cooler 4b forming part of the heat consuming installation 6 is greater than a quantity of heat produced from the fuel cell 10, compensation may be made for the heat shortage.
I 5 The waste heat collector 19 has a warm water collecting piping 32 including a second heat exchanger 33. The water bath 5 is connected to a secondary piping 34 connected to a first heat exc~langer 29 and the second heat exchanger 33. Thus, the vapor and warm water obtained from the waste heat collector 19 may be used to supply high-temperature water.
2 0 An electric;ty-to-heat converting device such as a heater may be used, when the heat load of the heat consuming installation 6 is greater than the quantity of heat produced from the fuel cell 10, to compensate for the heat shortage with the superfluous power or with thermal conversion of the power received at the power receiving equipment 8.
20g3193 A heat storage (not shown) may be provided for the waste heat collector 19 to store superfluous heat produced from the fuel cell 10. This provides a heat replenishing device for supplying the heat stored in the heat storage to - the heat consuming installation 6 at times of heat shortage.
S Further, part of the heat output of ~he boiler 28 may be stored for use at times of heat shortage.
The system wiring 1 3b may receive electricity generated by a solar cell (not shown) and a wind power generator (not shown).
The energy consumer has the customer heat consuming installation 52 I O using a combustible gas as a heat source. Where this customer heat consuming installation 52 is a dryer or the like adapted to use electricity and heat as heat sources also, the system may be constructed to supply electricity and heat to the customer heat consuming installation 52 along with the combustible gas supplied from a combustible gas receiving device 50 15 through a piping 51. Then, the least costly energy rnay be used in accordance with operating conditions, or the entire system including the customer heat consuming installation 52 may be operated with an objective function "y" set to an optimal condition.
The combustible gas received at the combustible gas receiving device 50 2 0 may be used as a fuel for the boiler 28 and as a combustion gas for the reformer 15. Where this combustible gas is the same as the fuel received at the fuel receiving device 9 (e.g. town gas having methane as the main component), one of the fuel receiving devices 9 and the combustible gas receiving device 50 may act also as the other to allow omission of the latter.
Fig. 2 is a block diagram showing a control system. The load of the in-system generator may be determined by the following methods:
~ 1) A method in which a load for minimizing the objective function "y" is determined beforehand by macroscopically seeing operations over a unit 5 time (e.g. one day), and the system is run under the load determined.
Variations in power load are dealt with by means of electricity intake, and those in heat load by means of the boiler.
(2) A method in which a power load and a heat load measured are stored in a memory, and rates of change are determined from the power load and 1 0 the heat load a unit time before (e.g. 30 minutes before) and a current power load and a current heat load, to estimate an energy demand for a next unit time. Operating conditions to meet the estimated demand and minimize an objective expression "y" are determined, and the system is run under these conditions for the next unit time.
1 5 (3) A method in which an energy demand pattern at every hour of a past period (e.g. the previous day, or one week before), and an energy demand for a next unit time (e.g. 30 minutes) is estimated from the demand pattern and based on a current energy demand. Operating conditions to meet the estimated demand and minimize the objective expression "y" are 2 0 determined, and the systern is run under these conditions for the next unit time.
Controls by the method (2) above will be described with reference to Fig.
2.
An energy demand estimating device 43 estimates an energy demand 2 5 occurring ~t time from now, frorn a current energy demand of the power consuming installation 3, heat consuming installation 6 and customer heat consuming installation 52 measured and computed by an energy demand computing device 42, an energy demand 41 the ~t time before, and an energy demand pattern 40 for the ~t time (control unit time) from now as stored in a memory 45. The estimated energy demand is input to a computing device 46 for computing an amount of operation of the fuel cell 10 acting as the in-system generator, to minimize the objective function "y"
under the condition of the estimated energy demand. A control unit 47 controls the fuel flow regulator valve 17 connected to the fuel cell 10, and I 0 controls and selects the type of energy (electricity, heat or combustible gas) used by each energy consuming installation of the energy consumer. These devices are operable under remote control by the computer 11 using a comrnunication line. Coefficients "a", "b" and "c" are set through a coefficientsetter 44 to meet the demand of the energy consumer. The memory 45 1 5 stores an objective function y=aXL+bXM~cXN.
The operating conditions, i.e. cost minimum, primary energy minimum, and environmental pollutant minimum, or any combination thereof, may be determined prior to operation of the system and may be changed during operation.
2 0 The coefficients "a", "b" and "c" rnay be rnanually set or changed through the coefficient setter 44 which may be included in the energy box 7.
Alternatively, signals may be transmitted through a communication line to the coefficient setter 44 from outside the energy box 7 or the system to set or change these coefficients.
~Og~193 When NOx level exceeds a reference level in or around a location of energy consumption, for example, il is conceivable ~o change, upon a governmental order, ~o an operation for environmental pollutant minimum, and especially NOx minimum.
The amount of operation compuling device46 computes an arnount of operation of the fuel cell 10 at from now to minimize the expression "y", based on the energy demand estimated by the energy demand estimating device 43 of the power consuming installation 3, heat consuming installation 6 and customer heat consuming installation 52 as well as the expression "y"
1 0 stored in the memory 45.
The control unit 47 controls the fuel flow regulator valve 17 and other components to secure the amount of operation of lhe fuel cell 10 computed by the amount of operation computing device 46.
There inevitably occurs an error between estimated energy demand and 1 5 actual consumption. Where this error occurs with the heat consuming installation 6, for example, and where the heat piping 34is maintained at a fixed return temperature, the control unit 47 may be operated in response to a decrease in the return temperature, to open the fuel flow regular valve l7 to a larger extent or ~o open the fuel valve of the boiler 28 to a larger extent for 2 0 an increased boiler output.
Such an arithmetic operation and storage are carried out by the computer 11.
With the foregoing construction, the fuel cell 10 may be operated in an optimal condition with respect to energy efficiency, in response to the energy 20931~3 demand of the power consuming installation 3 and heat consuming installation 6.
In the above embodiment, the expression "y" providing the objective function is y=aXL+bXM+cXN. It is also in accordance with the present S invention to employ y=aXL, y=bXM, y=cXN, y=aXL+bXM, y=aXL+cXN, or y=bXM+cXN.
cCOMPARATlVE EXPERIMENT>
Comparative experiment carried out on the energy supply system according to the present invention will be described next.
l O The experiment has been based on the following premises:
(1) The external energy received by the energy box 7 comprises commercial electricity and the fuel for the fuel cell.
(2) The electricity generated by the fuel cell 10 is supplied to the energy consumer.
I 5 (3) The heat generated by the fuel cell 10 is supplied to the energy consumer as a heat source for the water bath and absorption heaterlcooler.
(4) Electricity (4-1) 75% of the commercial electricity used is generated at a power plant using LNG as fuel. The calorific value of LNG is 13X106Kcal/ton. The 2 0 gasified form of LNG is natural gas. The term LNG as used in this specification includes LNG and natural gas for expediency. A quantity of CO2 generated is calculated by regarding LNG as methane.
(4-2) The overall efficiency of commercial electricity is 36% (= generating efficiency 0.4 X transmitting efficiency 0.9).
2 5 (4-3) The performance coefficient of electrical cooling equipment is 2.5.
2~931~13 (4-4) To supply 1 kwh power, the power plant, with the calorific value of LNG at 13X106Kcal/ton = 13X106T860 = 1.512X104kwh/ton, consumes LNG in the quantity of 1 kw~0.36: (1.512X104) = 1.837X10-4 tons, S produces COz in the quantity of 1.837X10-4tons X 44/16 = 5.05X10-4tons, and produces NOx in the quantity of 1.837X10-4tonsX0.48X10-3ton/ton = 8.82X10-~tons.
Assuming that 75% of electric~y is generated at an LNG ~hermal power l 0 plant, the above values become as follows:
LNG: 1.837X10-4tons X 0.75 = 1.378X10-4tons;
CO2: 5.05X10-4tons X 0.75 = 3.79X10-4tons;
NOx: 8.82X10-3tons X 0.75 = 6.62X10-8tons = 6.62X10-5kg .
(4-5) The unit price of commercial electricity is 15yen/kwh.
1 5 (5) Fuel Cell (5-1) The performance coefficient of the absorption air-conditioner is 1Ø
(5-2) The fuel cell is a phospha~e type fuel cell with power gen~raling efficiency at 40% and heat generating efficiency at 40%. In this embodiment, the efficiency is fixed regardless of load factor. However, the efficiency may 2 0 be a function of load factor.
(5-3) LNG is used as fuel gas for the fuel cell. Its unit price is 7.5yen/kwh (= 96yen/m3).
(5-4) To generale 1 kwh power, the fuel cell consumes LNG in the quantity of 1kwh~0.4.(1.512X104)kwh/ton =
2 5 1.653X10-4tons, and produces CO2 in the quantity of 1.653X10-4tons X44/16 = 4.55X10-4tons but does not produce NOx.
(6) Gas Boiler (6-1) To generate 1kwh calorie, the gas boiler, with its thermal efficiency at 5 0.8, consumes LNG in the quantity of 1kwh+0.8~(1.512X104)kwh/ton =
8.27X10-5tons, produces C02 in the quantity of 8.27X10-5tons X44/16 = 2.27X10-4tons, and I O produces NOx in the quantity of 8.27X10-5tons X1.44X10-3ton/ton =
1.191 X10-7tons = 11.91 X10-5kg.
FIRST COMPARATIVE EXPERIMENT
In the first experiment, the time period (12:00 to 13:00) which records a maximum power demand in the year was considered.
I 5 A consumer (total floor area: 2000m2) was assumed who consumed a total electric power of 180kwh with a power load exciuding space cooling (e.g. driving power, lighting and so on) at 144kwh, a cooling power load at 36kwh (corresponding to 36X2.5=9Okwh in terms 2 0 of space cooling), and a heat load for a warm water supply corresponding to 2kwh (corresponding to 2Ø8=2.5kwh in terms of boiler inpul).
Environmental pollution was assessed with reFerence to NOx only.
In a comparative example for the first experirnent, commercial electricity 2 5 was used as the energy for the loads except space cooling (e.g. driving power, lighting and so on), a heat pump air-conditioner driven by commercial electricity was used for space cooling purposes, and a boiler fueled by town gas was used for warm water supplying and space heating purposes.
The cost "L" (yen) of using these energy sources is;
L=180X15+2.5X7.5=2720(yen).
Tracing back to primary energy in this case, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consurned in supplying the energy to be consumed in one hour is, since the heat energy generated from 1 ton of LNG
is 1.512X104 (kwh/ton - LNG);
I O M = (180kwh~0.36XO.75+2.5~ ~ (1.512XtO4kwh/ton - LNG) - 2.50X10-2 (ton- LNG).
Where environmental pollution is assessed with reference to NOx only, the quantity "N" of nitrogen oxides (NOx) released in the course of conversion from the primary energy, supply and consumption of these 1 S energy forms is, since nitrogen oxides (NOx) are released in 6.62X10-8 (tons) when 1 kwh commercial electricity is generated, and the quantity of nitrogen oxides (NOx) in exhaust gas from the boiler fueled by town gas is 11.91X10-8 tons per kwh boiler output;
N = 180 X 6.62 X 10-8 + 2 X 11.91 X 10-8 = 1 .215X10-5(ton - NOx).
2 0 A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained by substituting, in the foregoing expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c-2.0X104 (1/ton), as follows:
y=4.0X10~4X2719+80X2.50X10~2+2.0X104Xl.215X10-5=
1.088+2.0+0.243=3.33.
In the energy supply system according to the present invention, on the other hand, an overall index Is obtained as in the above case, using the amount of operalion ~xu (kwh) of th~ fuel cell as a parameter.
First, where 0~=x<=2, the heat exhausted from the fuel cell is used as part S of the heat energy {corresponding to "x" (kwh)~ for warm water supplying and space heating purposes, the boiler fueled by town gas is used for the remainder, and the electricity generated by the fuel cell is used to cover the amo~nt corresponding to ~xu (kwh) in the power demand. The order in which the heat and electricity are generated by the fuel cell is optional. It is assumed here that the heat generated by the fuel cell is used first for the warm water supply and then for the space cooling, with the electric power used for purposes other than the space cooling.
The cost "L"(yen) of using these energy sources is;
L = (1 80-x~ X 15 + (2-x) ~ 0.8 X 7.5 + x t 0.7 X 7.5 = 2719 - 5.63x (yen).
I S Therefore, if x=2, the cost is 2710 yen.
Ttacin~ back to primary energy, the quantity of fossil fuel (in terrns of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
M = {(180-x)~0.36X0.75+(2-x).0 8+x/0 4} . (1 512X104) = 2.50X10-2 2 () -5.51 X1 0-5x Therefore, if x=2, the quantity is 2 50X1 o-2.
The quantity "N" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, as well as supply and consumption of these energy forms is;
2 S N = (180-x) X 6 62 X 10-8 + (2-x) X 11 91 X 10 B = 1 21~X10-5-1 853X10-7x.
Therefore, if x=2, thequantity is 1.178X10-5.
A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients S a=4.0X10-4 (1/yen), b=80 ~11ton) and c=2.0X104 (1/ton), as follows:
y = 3.33 - 0.01037x.
If x=0, y=3.33. If x=2, y=3.31.
Next, where 2C=X<=92, the heat exhausted from the fuel cell is used as sole heat energy for the warm water supplyiny and space hea~ing purposes, I 0 the absorption heater/cooler driven by the exhaust heat from the fuel cell to provide part of space cooling energy {(x-2)/2.5}, and the elec~ric power generated by the fuel cell is used to cover the amount corresponding to "x"
(kwh) in the power demand.
The cost "L" (yen) of using these energy sources is;
l S L = {(144-x)+35-(x-2)~2.5} X 15 + x+ 0.4 X 7.5 = 2712 - 2.25x (yen).
Therefore, if x=2, the cost is 2710 yen. If x=92, the cost is 2505 yen.
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
2 0 M = 1{(144-x)+36-(x-2)~2.5} ~ 0.36 X 0.75 + x t 0.4] + (1.512X104) =
2.49X10-2-2.76X1 o-5x.
Therefore, if x=2, the quantity is 2.48X10-2. If x=92, the quantity is 2.24X10-2.
The quantity "N" (in tons) of nitrogen oxides ~NOx) reieased in the course of conversion from the primary energy, as well as supply and consumption of these energy forms is;
N= l{(144-x)+36-(x-2)~2.5} X 6.62 X 10-8 = 1.197X10-5-9.27X10-8x.
Therefore, if x=2, the quantity is 1 .178X10-5. If x=92, the quantity is 3.44X1 o-6.
A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c=2.0X104 (1/ton), as follows:
y = 3.32 - 4.96X1 o-3x.
If x=2, y=3.31. If x=92, y=2.86.
Next, where 92~=x<=144, the heat exhausted from the fuel cell is used as sole heat energy for the warm water supplying and space heating purposes, 1 5 the absorption heater/cooler driven by the exhaust heat from the fuel cell to provide all the space cooling energy, and the electric power generated by the fuel cell is used to cover the amount corresponding to "x" (kwh) in lhe power demand. Superfluous exhaust energy is left unused.
The cost "L" (yen) of using these energy sources is;
2 0 L = (144-x) X 15 + x ~ 0.4 X 7.5 = 2160 + 3.75x (yen).
Therefore, if x=92, the cost is 2510 yen. If x=144, the cost is 2700 yen.
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
2 5 M = ~(144-X)+0.36XO.75+XfO.4} f (1 .512X104) = 1.984X10-2+2.76X10-5x.
~D9~1~3 Therefore, if x=92, the quantity is 2.24X10-2. If x=144, the quantity is 2.38X10-2.
The quantity "N" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, as well as supply and consumption of S these energy forms is;
N = (144-x) X 6.62 X 10-8 = 9.53 X 104 - 6.62 X 10-8x.
Therefore, if x=92, the quantity is 3.44X1 o-6. If x=144, the quantity is -2.80X10-9.
A dimensionless overall index providing the objective function for l 0 optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c=2.0X104 (1/ton), as follows:
y = 2.64 + 2.38X10-3x.
If x=92, y=2.86. If x=144, y=2.98.
l S Fig. 3 shows a graph plotted using the overall index for the range x = 0 to 144 as function of "x".
It will be seen from the results that the expression -y" is minimized when x=92, i.e. in the condition in which the fuel cell is operated at 92kwh to produce the exhaust heat just covering all the heat energy for warm water 2 0 supplying and space heating purposes and the space cooling energy. This condition is optimal.
The operation in this condition during the one hour from 12:00 to 13:00 produces the following results, in relation to the comparative example:
the energy cost is 2510 ~ 2720 X 100 - 92.3%, 2 5 the quantity of fossil fuel is 2.24 X 1 o-2, 2.50 X 1 o-2 X 100 = 89.6%, and the quantity of nitrogen oxides (NOx) is 3.44 X 1 o-6 + 1.215 X 10-5 X 100 =
28.3%.
Thus, this embodiment achieves reductions in the energy cost, primary energy and environmental pollutants.
SECOND COMPARATIVE EXPERIMENT
In the second comparative experiment, a day (in summer) which records a maximum power demand of the year was considered.
Fig. 4 shows a demand pattern of heat energy for warm water supply on such a day. Fig. 5 shows demand patterns of electricity and of space cooling 1 0 energy on the same day.
The cost UL" (yen) of using these energy sources in these patterns is;
L = 2042 X 15 + 28 ~ 0.8 X 7.5 = 30900 (yen), where "2042" is the electric power demand for the day derived from Fig. 7, and "28" is the heat demand for the day derived from Fig. 6, both in kwh.
l 5 Tracing back to primary energy in this case, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
M= (2042+0.36X0.75+28) + (1.512X104) = 0.283 (ton - LNG).
The quantity "N" ~in tons) of nitrogen oxides (NOx) released in the course 2 0 of conversion from the primary energy, supply and consumption of these energy forms is;
N = 2042 X 6.62 X 1 o~8 + 28 X 11.91 X 1 o-s = 1.385X10-4 (ton - NOx).
In the energy supply system according to the present invention, on the other hand, the operating condition of the fuel cell was optimized in 2 5 accordance with the energy demand patterns shown in Figs. 4 and 5, by the same computing method as in the first comparative example. Results were obtained as shown in the fuel cell operating pattern in Fig. 6 and the commercial electricity intake pattern in Fig. 7.
The cost "L" (yen) of using energy based on these patterns is;
S L = 796 X 15 + 898 + 0.4 X 7.5 = 28800 (yen).
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one llour is;
M= (796~0.36X0.75~898Ø4) ~ (1.512X104) = 0.258.
I 0 The quantity HN" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, supply and consumption of these energy forms is;
N = 796 X 6.62 X 10-8 = 5.27X10-5.
These results show that on the day which records the maximum power I S demand of the year;
the energy cost is 28800 + 30900 X 100 = 93.2%, the quantity of fossil fuel is 0.258 . 2.285 X 100 = 91.2%, and the quantity of nitrogen oxides (NOx) is 5.27 X 10-5 + 1.385 X 10-4 X 100 =
38.1 %, 2 0 with respect to the comparative example. Thus, this embodiment achieves improvelnent in energy eHiciency.
Since the maximum power intake is drastically reduced from 180kwh to 57kwh, the contract demand may be diminished from 200kwh to 100kwh.
Moreover, ~he commercial electricity intake pattern is leveled to make a great contribution toward improvement in the availability factor of commercial electricity generating facilities.
In the described embodiment, LNG is used as primary energy. It is possible to use fossil energy derived from LNG, coal or petroleum, atomic 5 energy from uranium, or hydraulic energy from hydropower generating plants, or a combination of some of these energy forms. In such a case, the cost of energy, the quantity of fuel in terms of LNG, and the quantities of C02 and NOx may be computed accordingly.
The foregoing embodiment may include a boiler or a cold nuclear fusion l O apparatus added to the system to act as an in-systern heat generator for meeting heat shortages when the heat load of the heat consuming equipment is greater than the heat generated by the in-system power generator. Needless to say, a boiler is usable as an in-system heat generator. Fuels usable for the boiler include natural gas, town gas, heavy 1 5 oil, light oil, coal and city waste. The boiler may be a heat recovery boiler provided for a city waste incinerator. The in-system heat generator may be a heat exchanger using, as a heat source, a warm fluid such as steam or warm water produced by a separate boilef. A cold nuclear fusion apparatus has been attracting attention since 1989 when Fleismann and Pons, and Jones 2 0 et al reported cold nuclear fusion.
For example, PCT WO 90/10935 discloses a method and apparatus for generating a large quantity of heat by nuclear fusion. According to this publication, an electrolysis of heavy water is carried out using platinum or thelike as the anode and palladium or the like as tl1e cathode, wherein nuclear 2 5 fusion is caused with a significant probability by filling the crystal lattice of "-palladium with heavy water atoms to make atomic nuclei of heavy water anomalously approach one another. The quantity of heat thereby generated exceeds the energy required for the electrolysis. Thus, a cold nuclear fusion apparatus may be used as a heat generator in the system according to the 5 present invention.
In this way, a boiler or a cold nuclear fusion apparatus may be used to meet heat shortages when the heat load of the heat consuming equipment is greater than the heat generated by the in-system power generator.
The heat derived from the boiler may be used when the heat load of the 10 heat consuming equipment temporarily exceeds the heat generated by the in-system power generator. The cold nuclear fusion apparatus may be used in the event of regular heat shortages.
Then, the heat obtained from the boiler or low nuclear fusion apparatus is supplemented when the heat demand temporarily increases and the heat 1 5 load of the heat consuming equipment becomes greater than the heat available from the in-system power generator. This is economical in that a small in-syslelrl power gerl~ralor is suf~icienl, inslead of necessilatirlg an in-system power generator capable of meeting the maximum heal demand.
Setting of coefficients"a", "b" and "c" to the expression "y" (initial setting 2 0 and setting changes) and operation controls may be provided from a central control unit (central control room, central control panel or the like) through wiring such as an exclusive communication line, telephone line, power line or CAlV, or by radio. Such controls include selection of energy consuming installations (power consuming equipment or heat consuming equipment) used by the energy consumer, energy selection (electricity or heat), load control, and control of varied devices such as valves.
This allows the coefficient setting and operation controls to be effected from a remote location, thereby controlling the system in a subtle and precise 5 manner for its optimal operation.
An absorption heater/cooler may be installed adjacent the in-system generator, such as a cogeneration system using an engine or a turbine, a fuel cell or the like, to use the heat generated by the in-system generator as aheat source. Warm or cold water or warm or cold air thereby produced may 1 0 be supplied to the energy consumer through piping or ducting. This is merely a question of thermal conversion or location for installing or a thermal converter, and therefore is one form of the present invention.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, 1 5 reference should be made to the appended claims, rather than to the foregoing specification, as indicating the scope of the invention.
However, difficulties have been encounlerQd in bullding new power plarlls in that local communities tend to oppose thermal power plants mainly on the grounds of the problem of pollu~ion, and nuclear power plants mainly from 2 0 the safety point of view. Power use patterns fluctuate throughout the year, with the consurnption maximizing during a limited period of time in summer.
~.
Even if new power plants are built, the annual availability factor is very low.
Consequently, it is uneconomical since new power plants will have an extremely low use efficiency for the plant investment required.
On the other hand, the demand for lown gas reaches Its maximum in winter and its minimum in summer. Town gas companies must install production equipment and supply equipment to meet the maximum demand in winter. Such equipment suffers a very low availability factor through the 5 year, particularly in summer.
Thus, there is a need for development of an energy supply system, which will allow power companies and town gas companies to make effective use of their respective facilities.
Systems for supplying energy to such energy consumers who consume 1 0 heat and electricity include what is known as a cogeneration system. The cogeneration system supplies commercial electric power (the power supplied from power suppliers for payment), the power obtained by driving a generator with a gas engine or gas turbine, and the waste heat from these machines.
The above cogeneration system has a high energy use efficiency to provide the advantages of low energy cost, reduced contract demand and leveled quantity of electricity. However, only an operation to minimize fuel consumption or a rated operation has been kept in view in driving the generator with the gas engines or gas turbines. The syslem has not been 2 0 run, taking efficiency of the entire system into account, or from a national point of view.
SUMMARY OF THE INVENTION
The present invention has been made having regard to the state of the art 2 5 noted above. An object of the present invention, therefore, is to provide an energy supply syslem which makes effective use of energy and takes preservation of the environment into account from a consumers' standpoint as well as a national point of view.
Other objects of the invention will be apparent ~rom the following 5 description.
The above object is fulfilled, according to the present invention, by an energy supply system having a power receiving equipment for receiving electric power from a power plant, an in-system power generating device for generating power and heat by using at least some fuel received at a fuel 10 receiving device, a power supplying device for supplying, in system interconnection, the power received at the power receiving equipment and the power generated by the in-system power generating device to a power consuming installation, and a heat supplying device for supplying the heat generated by the in-system power generating device to a heat consuming 15 installation. The energy supply system comprises an amount of operation computing device for computing an amount of operation of the in-system power generating device to minimize an equation "y" set out hereunder when meeting an energy demand of an energy consumer, and a control device for controlling the in-system power generating device to satisfy the amount of 2 0 operation computed by the amount of operation computing device;
y = a XL +b XM +c XN , where "a", "b" and "c" are weighting coefficients a >=0, b >=0 and c >=0, which do not become zero at the same time, the coefficients "a", "b" and "c" being 2 5 determinable by an assessor according to a selected mode of assessment, but a XL, b XM and c XN being impossible to assess without being placed in the order as in the embodimen~ since "L", "M" and "N" are different in order and unit, "L" is an energy cost borne by the energy consumer when the energy S demand is met, "M" is a calculated total quantity of primary energy consumed to meet lhe energy demand, and "N" is a calculated total quantity of environmental pollutants released when the energy demand is met.
With the energy supply system according to the present invention, the control device controls the in-system power generating device to operate in an optimal condition with respect to the cost borne by the energy consumer, consumption of primary energy, and release of environmental pollutants. In this way, the energy consumer requiring heat and electricity is supplied with 1 5 a necessary quantity of heat and an appropriate quantity of electricity. In the process of supplying the heat and power, the power obtained through generation of the heat is added to the power received from the power plant.
Thus, with the energy supply system according to the present invention, the in-system power generating device is operable in an optimal condition 2 0 with respect to the cost borne by the energy consumer, consumption of primary energy, and release of environmental pollutants, to supply heat and power to the energy consumer. This system is capable of a comprehensive improvement in energy efficiency not only with the in-system power generating device but with addition of commercial electricity. This system 2 S lightens the burden on the energy consumer, lessens the necessity for new generating and transmitting facilities, and reduces release of environmental pollutants. That is, this energy supply system realizes effective use of energy from the standpoint of the energy consumer and from a national point of view, while contributing toward preservation of the environment.
The energy supply system according to the present invention may further comprise an in-system heat generating device besides the in-system power generating device, wherein the heat generated by the in-system heat generating device also is supplied to the heat consuming installation.
The in-system heat generating device is operable to supply heat in the 1 0 event of a regular or temporary increase in the heat demand. This allows the in-system power generating device to have a reduced size, thereby enabling an economical system design and operation.
The heat generated by the in-system heat generating device is used when the heat demand increases temporarily and the heat load of the heat 1 5 consuming installation exceeds the quantity of heat available from the in-system power generating device. This is economical in that a small in-system power generating device is sufficient, instead of necessitating an in-system power generating device capable of meeting a maximum heat demand.
2 0 The energy supply system according to the present invention may further comprise a combustible gas receiving device, wherein a customer heat consuming installation is provided as an energy consuming installation of the energy consumer to use as a heat source a combustible gas received at the combustible gas receiving device and/or the power or the heat, the energy 2 5 demand including a demand of the customer heat consuming installation.
20931g3 With this construction, the system may be oplimized from economic and national points of view also where the energy consumer has a consuming installation which directly uses a combustible gas as a heat source.
Where the energy consumer has an energy consuming installation 5 adapted to use power, heat and combustible gas, an optimal amount of operation of the in-system power generating device may be computed after determining a priority order of use.
Then, the in-system power generating device is operated in the cornputed optimal amount. The energy cor-suming installations of the energy consumer 10 are driven under this condition and under central control (a local control being possible where little load variation occurs).
Thus, the optimization may include the energy consuming installations adapted to use power and heat as well.
The consumption of primary energy refers to consumption at the power 15 plant, the in-system power generating device, and combustible gas consuming equipment (excluding the in-system power genera~ing device) to meet the energy demand of the enorgy consumer. Ths combustible gas consuming equipment refers generally to equipment such as a boiler or other in-system heat generating device (not including the in-system power 2 0 generating device) and the energy consumer's dryer or other customer heat consuming installation that consumes a combustible gas. However, these pieces of equipment may be replaced with the customer heat consuming installation for the sake of simplicity.
The electric power consuming installation refers to an installation that 2 5 uses AC and/or DC.
The heat consuming inslallation refers to an installation that uses warm water and/or steam. Warm water andlor steam are used for directly supplying warm water or as heat source for heating spaces or for an absorption heater/cooler, or as heat source for chemical or mechanical 5 equipment.
The energy demand refers to demands for electric power and heat. The energy demand may be determined by a well-known method. That is, electric power may be measured with a wattmeter. Heat may be measured by W X(lo -Ir ) in the case of a recirculating syslem where a warm fluid is 1 0 supplied from a fuel cell and relurned thereto after its heat is radiated from a heat consuming installation.
In the above expression, "W" is a flow rate of the warm fluid (kglh), and "I!' is an enthalpy (kcal/kg). IF the fluid undergoes no phase change and no change in specific heat "C" (kcal/kgC), W XC X( To -Tr ), where "T" is a 1 S temperature (C), is established. The subscript "o" represents an output from the energy supply system, and the subscript "r" a return from the energy supply system.
Primary energy includes fossil energy such as LNG (liquefied natural gas), coal and petroleum, atomic energy such as uranium, and hydraulic energy 2 0 from a hydropower generating plant.
Where only fossil fuels such as LNG, naphtha, heavy oil and coal are considered, and a plurality of such fuels are used, "M", or consumption of primary energy, may be evaluated in ~erms of one of the fuels. The conversion may be based on calories, weighting according to fuel qualities, 2 5 or purchase prices. When evaluating nuclear power generation also, a fissionable material may be converted for equivalence to LNG with respect to cost or the like. Selection of the fuel for use in the evaluation is arbitrary.
Primary energy consumption at a hydropower generating plant normally is negligible.
"N", or environmenlal pollu~an~s, may be exemplified by C02, NOx and SOx. Assess,oent thereof may be made by N = W1 [C02I + W2[NOxI +
W3[SOxI, where W1, W2 and W3 are weighting coefficients. When only C02 is considered, the coefficients may be W1=1, W2=0 and W3-0. When only NOx is considered, the coefficients may be W1=0, W2=l and W3=0. When 1 0 only SOx is considered, the coefficients may be Wl=O, W2=0 and W3=1.
The pollutant for use in the assessment may be selected according to circumstances.
The system may be constructed and controlled with the above expression "y" modified as y=aXL, i.e. taking only energy cost into account. In this case, 1 5 heat and electricity may be supplied to the energy consumer to meet its energy demand in such a way as to minimize the cost borne by the energy consumer.
Thus, it is exceedingly economical in that the energy demand is met with a minimum cost borne by the energy consumer.
2 0 The system may be constructed and controlled with the above expression "y" modified as y--bXM, i.e. taking only a total consumption of primary energy into account. In this case, heat and electrici~y may be supplied to the energy consumer to meet its energy demand in such a way as to minimize a calculated total quantily of primary energy consumption including quantities 20931~3 of primary energy consumed at the power plant, in-system power generating devices and combustible gas consuming equipment.
Since the energy demand ;s met in such a way as to minimize a calculated total quantity of primary energy consumption including quantities 5 of prirnary energy consumed at the power plant, in-system power generating devices and the like, energy sources and other resources may be saved significantly at the national level.
The system may be constructed and controlled with the above expression "y" modified as y-cXN, i.e. taking only a total release quantity of I O environmer~al pollutants into accoùnt. In this case, heat and electricity may be supplied to the energy consumer to meet its energy demand in such a way as to minimize a calculated total quantity of environmental pollutants including quantities of environmental pollutants released from the power plant, in-system power generating devices and combustible gas consuming 1 5 equipment.
Since the energy demand is met in such a way as to minimize a calculated total quantity of environmental pollutants including quantities of environmental pollutants released from the power plant, in-system power generating devices and the like, environmental pollution may be prevented 2 0 on global scale.
The system may be constructed and controlled with regard to y=aXL+bXM, y=bXM+cXN, or y=aXL+cXN. These are all special cases included in the invention considering y=aXL+bXM+cXN. In these special cases, y=aXL+bXM+cXN may be set to the system, with zero assigned to an g unnecessary coé`fficient or coefficients, or an expression not including an unused term may be stored in memory in advance.
The in-system power generating device may comprise a fuel cell for producing electric power and heat, or an apparatus for producing power and S heat by using a gas engine or gas turbine to drive a generalor.
The fuel cell may be the phosphate type, solid electrolyte type or fused carbonate type. The phosphate type, which causes a reaction between hydrogen and oxygen, has already been put to practical use and may be applied directly to this system.
Normally, this in-system power generating device is installed adjacen~ to a site of energy consumption by the energy consumer.
In recent years, progress has been made in the research on the phosphate type fuel cell which uses hydrogen and oxygen as raw materials to output electric power and waste heat. A fuel cell outputting approximately 1 5 200kw has reached the stage of practical use. With respect to input energy, the power plant is about 40% efficient, while the fuel cell has a power generating efficiency of about 40% and a heat generating efficiency of about 40/0. Thus, the fuel cell is attracting attention as a new energy supply system. With the fuel cell used as the in-system power generating device, 2 0 the energy consumer may be supplied with the heat obtained from the fuel cell and the power oblained from the fuel cell and power plant.
Where the in-system power generating device uses a gas engine or gas turbine to drive a generator for generating power and heat, its main component is the gas engine or gas turbine which has a rough and severe 2 5 drive. This gives rise to the a number of disadvantages such as its operation .
209~193 requires careful attention, ils maintenance requires skill, its generating efficiency is low, and it produces NOx. These disadvantages are diminished where a fuel cell is used as the in-system power generating device as noted above. In addition, the fuel cell produces water from the reaction between 5 hydrogen and oxygen, and this water may also be used to advantage.
The energy supply system may further comprise a heat storage for storing, in the form of warm water, superfluous heat generated by the in-system power generating device, and a heat replenishing device for supplying the heat stored in the storage device to the heat consuming installation at a time 10 of heat shortage. Where a rated capacity of the in-system power generating device is determined from a heat load, the in-system power generating device may have a reduced rated capacity since the heat load is leveled.
Thus, the heat made superfluous at normal times may be stored for use when the heat demand temporarily increases. This is economical in that a 15 small in-system power generating device is sufficient, instead of necessitating an in-system power generating device capable of meeting a maximum heat demand.
Heat shortages may be covered by thermal conversion of superfluous electric power, such as by using a heater or other electricity-to-heat 2 0 converting device.
Then, the heat obtained from the thermal conversion of superfluous power by the electricity-to-heat converting device is supplemented when the heat demand temporarily increases and the heat load of the heat consuming equipment becomes greater than the heat available from the in-system 2 5 power generator device. This is economical in that a small in-system power ` ` 20q3 I q3 generating device is sufficient, instead of necessit~ g~ in-system power generating device capable of meeting a maximum heat demand.
The energy supply system may further comprise a power storage for storing the power supplied from the power receiving equipment or part of the power generated by the in-system power generating device at a time of low power demand, and a power replenishing device for supplying the power stored in the power storage to the power cor~suming installation. This enables leveling of a demand for commercial electricity. Where a rated capacity of the fuel cell is determined from a power load, the fuel cell may have a reduced rated capacity.
Thus, the power stored in the power storage may be used to compensate for a shortage when the power demand temporarily increases. This is economical in that sufficient power to meet a maximum power demand need not be received at the power receiving equipment, thereby achieving a reduced contract demand.
The energy supply system may further comprise a back-current device for causing a back current of part of the power generated by the in-system power generating device to the external power plant when the power generated by the in-system power generating device exceeds a power demand.
2 0 With this construction, when heat is in great demand and superfluous power is generated by the in-system power generating device, the power may be transmitted in the back current to the external power plant for effective use. This improves the energy efficiency of the entire system to contribute toward promotion of the national economy.
Hydrogen gas may be received at a fuel gas receiving device to be used as the fuel for the fuel cell. However, it is more economical to receive a hydrocarbon fuel (e.g. methane, propane or butane) at the fuel receiving device, and produce hydrogen gas therefrom at a ref.ormer to be used as the 5 fuel for the fuel cell.
When the hydrocarbon fuel is used to operate the fuel cell, hydrogen gas may be obtained from the reformer to be used as the fuel for the fuel cell.
Thus, it is sufficient to supply the hydrocarbon fuel for operation of the fuel cell, which promotes applicability.
1 0 The energy supply system may further comprise a gas storage for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power when the fuel cell is driven in a high-load condition to meet a thermal demand though electric power is superfluous. The hydrogen gas stored may be supplied to 15 the fuel cell.
Where a hydrocarbon fuel is received as the fuel for the fuel cell, this may be used as a raw material for producing hydrogen gas at the reformer. The hydrogen gas produced may be supplied lo the fuel cell.
Then, the hydrogen gas generated by superfluous power may be stored in 2 0 the gas storage to be used as the fuel for the in-system power generating device. This allows a reduced quantity of fuel to be received at the fuel receiving device, thereby saving resources.
The hydrogen gas produced by reforming hydrocarbon may be stored for use at high load times.
The energy supply system may further comprise a solar cell connected to the power consuming installation. Thus, power obtained therefrom may be supplied to the power consuming instailation.
Since the power obtained from the solar cell is supplied to the power 5 consuming installation, a si~nificant reduction is achieved in the quantity ofpower received at the power receiving installation and in the quantity of power to be obtained from the in-system power generating device.
BRIEF Di--SCRlPTlON OF THE DRAWINGS
1 0 For the purpose of illustrating the invention, there are shown in the drawings several forms which are presen~ly preferred, it being understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.
Fig. 1 is a block diagram of an energy supply system according to the 15 present invention.
Fig. Z is a block diagram of a control system.
Fig. 3 is a graph showing a correlalion between an overall index and an amount of operation of a fuel cell.
Fig. 4 is a graph showing a heat energy demand pattern in a comparative 2 0 example.
Fig. 5 is a graph showing electricity demand patterns in the comparative example.
Fig. 6 is a graph showing an operating pattern of the fuel cell.
Fig. 7 is a graph showing a pattern of commercial electricity intake.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present inven~ion for supplying energy in an optimal manner will be described with reference to an embodiment as illustrated in the drawings.
However, the technical scope of the invention is not limited to this embodiment.
Referring to the block diagram in Fig. 1, an energy consumer has an electric power consuming installation 3 including a group of DC equipment 1, a group of AC equipment 2, and an electric heater/cooler 4a which is one type of AC equipment; a heat consuming installation 6 including an absorption heater/cooler 4b and a water bath 5; and a customer heat consuming installation 52 such as a dryer using a combustible gas, power or heat as a heat source. Energy is supplied to the consumer from an energy box 7 having an energy supply system according to the present invention.
The energy box 7 herein refers to a combination of a piece of power 1 5 receiving equipment 8, a fuel receiving device 9, an in-system power generator 10 such as a fuel cell, an in-system heat generator such as a boiler, a computer 11 acting as a computing device, and a control unit, which combination forms the core of the present invention. These devices are not necessarily contained in a box or a chamber.
2 0 Electricity is transmitted from an external power plant to the power receiving equipment 8 having a wattmeter (not shown), a circuit breaker and the like. The group of AC equipment 2 is connected to the power receiving equipment 8 through system wiring 13a and l 3d. The group of DC
equipment 1 is connected to the power receiving equipment 8 through a 2 5 system wiring 13e having an AC-to-DC converter 14.
Town gas having methane as its main component is received at the fuel receiving device 9 having a gas meter (not shown~, a cutoff valve and the like. The town gas received is reformed into hydrogen gas by using water vapor in the presence of a catalyst. The town gas may be used also as a fuel for heating a reformer 15 and as a boiler fuel as described hereinafter. The hydrogen gas obtained is supplied to a fuel eleclrode of the fuel cell 10 through a flow regulator valve 17. ~he fuel cell lO receives air at an air electrode thereof from an air blower (not shown). The fuel cell 10 generates electricity through a reaction between hydrogen and oxygen. At the same l O time, water is collected (though not shown) while heat is collected in the foJm of warm water and/or vapor by an waste heat collector 19.
The fuel cell 10 has an output wiring 13b connected to a DC-to-AC
inverter 20. The inverter 20 is connected through a system wiring 13c to the system wiring 13a. Thus, the power output of the fuel cell 10 is in system l S interconnection with the power received by the power receiving equipment 8.
This provides a power supplying device for supplying the power generated by the fuel cell 10 to the power consuming installa~ion 3. The power outpu~ of the fuel cell 10 may be supplied to ~he DC consuming equipmen~ without passing it through the inverter.
2 0 This system interconnection, when ~he power generated by the fuel cell 10 exceeds a power demand of the power consuming installation 3, allows part of the power generated by the fuel cell 10 to be flowed back to a commercial power supplier.
At times of low power demand, superfluous power may be used in 2 5 electrolysis of water to generate hydr~gen gas and oxygen gas. This 21)93193 hydrogen gas may be s~ored in a gas storage 22 to be used as a fuel for the fuel cell 10. This is effective when it is difficult to operate the fuel cell 10under a low load condition or when the back-current to the power supplier is difficult for various reasons.
S Further, a power storage (not shown) may be connected to the output wiring 13b to store superfluous power for use at times of power shortage.
The waste heat collector 19 and absorption heater/cooler 4b are interconnected through a vapor collecting piping 26a and a condensed water re~urn piping 26b. Thus, heating and cooling are effected by means of the I 0 vapor obtained from the waste heat collector 19. A boiler 28 is connected to the vapor collecting piping 26a through a second control valve 27a. Thus, when a heat load of the absorption heater/cooler 4b forming part of the heat consuming installation 6 is greater than a quantity of heat produced from the fuel cell 10, compensation may be made for the heat shortage.
I 5 The waste heat collector 19 has a warm water collecting piping 32 including a second heat exchanger 33. The water bath 5 is connected to a secondary piping 34 connected to a first heat exc~langer 29 and the second heat exchanger 33. Thus, the vapor and warm water obtained from the waste heat collector 19 may be used to supply high-temperature water.
2 0 An electric;ty-to-heat converting device such as a heater may be used, when the heat load of the heat consuming installation 6 is greater than the quantity of heat produced from the fuel cell 10, to compensate for the heat shortage with the superfluous power or with thermal conversion of the power received at the power receiving equipment 8.
20g3193 A heat storage (not shown) may be provided for the waste heat collector 19 to store superfluous heat produced from the fuel cell 10. This provides a heat replenishing device for supplying the heat stored in the heat storage to - the heat consuming installation 6 at times of heat shortage.
S Further, part of the heat output of ~he boiler 28 may be stored for use at times of heat shortage.
The system wiring 1 3b may receive electricity generated by a solar cell (not shown) and a wind power generator (not shown).
The energy consumer has the customer heat consuming installation 52 I O using a combustible gas as a heat source. Where this customer heat consuming installation 52 is a dryer or the like adapted to use electricity and heat as heat sources also, the system may be constructed to supply electricity and heat to the customer heat consuming installation 52 along with the combustible gas supplied from a combustible gas receiving device 50 15 through a piping 51. Then, the least costly energy rnay be used in accordance with operating conditions, or the entire system including the customer heat consuming installation 52 may be operated with an objective function "y" set to an optimal condition.
The combustible gas received at the combustible gas receiving device 50 2 0 may be used as a fuel for the boiler 28 and as a combustion gas for the reformer 15. Where this combustible gas is the same as the fuel received at the fuel receiving device 9 (e.g. town gas having methane as the main component), one of the fuel receiving devices 9 and the combustible gas receiving device 50 may act also as the other to allow omission of the latter.
Fig. 2 is a block diagram showing a control system. The load of the in-system generator may be determined by the following methods:
~ 1) A method in which a load for minimizing the objective function "y" is determined beforehand by macroscopically seeing operations over a unit 5 time (e.g. one day), and the system is run under the load determined.
Variations in power load are dealt with by means of electricity intake, and those in heat load by means of the boiler.
(2) A method in which a power load and a heat load measured are stored in a memory, and rates of change are determined from the power load and 1 0 the heat load a unit time before (e.g. 30 minutes before) and a current power load and a current heat load, to estimate an energy demand for a next unit time. Operating conditions to meet the estimated demand and minimize an objective expression "y" are determined, and the system is run under these conditions for the next unit time.
1 5 (3) A method in which an energy demand pattern at every hour of a past period (e.g. the previous day, or one week before), and an energy demand for a next unit time (e.g. 30 minutes) is estimated from the demand pattern and based on a current energy demand. Operating conditions to meet the estimated demand and minimize the objective expression "y" are 2 0 determined, and the systern is run under these conditions for the next unit time.
Controls by the method (2) above will be described with reference to Fig.
2.
An energy demand estimating device 43 estimates an energy demand 2 5 occurring ~t time from now, frorn a current energy demand of the power consuming installation 3, heat consuming installation 6 and customer heat consuming installation 52 measured and computed by an energy demand computing device 42, an energy demand 41 the ~t time before, and an energy demand pattern 40 for the ~t time (control unit time) from now as stored in a memory 45. The estimated energy demand is input to a computing device 46 for computing an amount of operation of the fuel cell 10 acting as the in-system generator, to minimize the objective function "y"
under the condition of the estimated energy demand. A control unit 47 controls the fuel flow regulator valve 17 connected to the fuel cell 10, and I 0 controls and selects the type of energy (electricity, heat or combustible gas) used by each energy consuming installation of the energy consumer. These devices are operable under remote control by the computer 11 using a comrnunication line. Coefficients "a", "b" and "c" are set through a coefficientsetter 44 to meet the demand of the energy consumer. The memory 45 1 5 stores an objective function y=aXL+bXM~cXN.
The operating conditions, i.e. cost minimum, primary energy minimum, and environmental pollutant minimum, or any combination thereof, may be determined prior to operation of the system and may be changed during operation.
2 0 The coefficients "a", "b" and "c" rnay be rnanually set or changed through the coefficient setter 44 which may be included in the energy box 7.
Alternatively, signals may be transmitted through a communication line to the coefficient setter 44 from outside the energy box 7 or the system to set or change these coefficients.
~Og~193 When NOx level exceeds a reference level in or around a location of energy consumption, for example, il is conceivable ~o change, upon a governmental order, ~o an operation for environmental pollutant minimum, and especially NOx minimum.
The amount of operation compuling device46 computes an arnount of operation of the fuel cell 10 at from now to minimize the expression "y", based on the energy demand estimated by the energy demand estimating device 43 of the power consuming installation 3, heat consuming installation 6 and customer heat consuming installation 52 as well as the expression "y"
1 0 stored in the memory 45.
The control unit 47 controls the fuel flow regulator valve 17 and other components to secure the amount of operation of lhe fuel cell 10 computed by the amount of operation computing device 46.
There inevitably occurs an error between estimated energy demand and 1 5 actual consumption. Where this error occurs with the heat consuming installation 6, for example, and where the heat piping 34is maintained at a fixed return temperature, the control unit 47 may be operated in response to a decrease in the return temperature, to open the fuel flow regular valve l7 to a larger extent or ~o open the fuel valve of the boiler 28 to a larger extent for 2 0 an increased boiler output.
Such an arithmetic operation and storage are carried out by the computer 11.
With the foregoing construction, the fuel cell 10 may be operated in an optimal condition with respect to energy efficiency, in response to the energy 20931~3 demand of the power consuming installation 3 and heat consuming installation 6.
In the above embodiment, the expression "y" providing the objective function is y=aXL+bXM+cXN. It is also in accordance with the present S invention to employ y=aXL, y=bXM, y=cXN, y=aXL+bXM, y=aXL+cXN, or y=bXM+cXN.
cCOMPARATlVE EXPERIMENT>
Comparative experiment carried out on the energy supply system according to the present invention will be described next.
l O The experiment has been based on the following premises:
(1) The external energy received by the energy box 7 comprises commercial electricity and the fuel for the fuel cell.
(2) The electricity generated by the fuel cell 10 is supplied to the energy consumer.
I 5 (3) The heat generated by the fuel cell 10 is supplied to the energy consumer as a heat source for the water bath and absorption heaterlcooler.
(4) Electricity (4-1) 75% of the commercial electricity used is generated at a power plant using LNG as fuel. The calorific value of LNG is 13X106Kcal/ton. The 2 0 gasified form of LNG is natural gas. The term LNG as used in this specification includes LNG and natural gas for expediency. A quantity of CO2 generated is calculated by regarding LNG as methane.
(4-2) The overall efficiency of commercial electricity is 36% (= generating efficiency 0.4 X transmitting efficiency 0.9).
2 5 (4-3) The performance coefficient of electrical cooling equipment is 2.5.
2~931~13 (4-4) To supply 1 kwh power, the power plant, with the calorific value of LNG at 13X106Kcal/ton = 13X106T860 = 1.512X104kwh/ton, consumes LNG in the quantity of 1 kw~0.36: (1.512X104) = 1.837X10-4 tons, S produces COz in the quantity of 1.837X10-4tons X 44/16 = 5.05X10-4tons, and produces NOx in the quantity of 1.837X10-4tonsX0.48X10-3ton/ton = 8.82X10-~tons.
Assuming that 75% of electric~y is generated at an LNG ~hermal power l 0 plant, the above values become as follows:
LNG: 1.837X10-4tons X 0.75 = 1.378X10-4tons;
CO2: 5.05X10-4tons X 0.75 = 3.79X10-4tons;
NOx: 8.82X10-3tons X 0.75 = 6.62X10-8tons = 6.62X10-5kg .
(4-5) The unit price of commercial electricity is 15yen/kwh.
1 5 (5) Fuel Cell (5-1) The performance coefficient of the absorption air-conditioner is 1Ø
(5-2) The fuel cell is a phospha~e type fuel cell with power gen~raling efficiency at 40% and heat generating efficiency at 40%. In this embodiment, the efficiency is fixed regardless of load factor. However, the efficiency may 2 0 be a function of load factor.
(5-3) LNG is used as fuel gas for the fuel cell. Its unit price is 7.5yen/kwh (= 96yen/m3).
(5-4) To generale 1 kwh power, the fuel cell consumes LNG in the quantity of 1kwh~0.4.(1.512X104)kwh/ton =
2 5 1.653X10-4tons, and produces CO2 in the quantity of 1.653X10-4tons X44/16 = 4.55X10-4tons but does not produce NOx.
(6) Gas Boiler (6-1) To generate 1kwh calorie, the gas boiler, with its thermal efficiency at 5 0.8, consumes LNG in the quantity of 1kwh+0.8~(1.512X104)kwh/ton =
8.27X10-5tons, produces C02 in the quantity of 8.27X10-5tons X44/16 = 2.27X10-4tons, and I O produces NOx in the quantity of 8.27X10-5tons X1.44X10-3ton/ton =
1.191 X10-7tons = 11.91 X10-5kg.
FIRST COMPARATIVE EXPERIMENT
In the first experiment, the time period (12:00 to 13:00) which records a maximum power demand in the year was considered.
I 5 A consumer (total floor area: 2000m2) was assumed who consumed a total electric power of 180kwh with a power load exciuding space cooling (e.g. driving power, lighting and so on) at 144kwh, a cooling power load at 36kwh (corresponding to 36X2.5=9Okwh in terms 2 0 of space cooling), and a heat load for a warm water supply corresponding to 2kwh (corresponding to 2Ø8=2.5kwh in terms of boiler inpul).
Environmental pollution was assessed with reFerence to NOx only.
In a comparative example for the first experirnent, commercial electricity 2 5 was used as the energy for the loads except space cooling (e.g. driving power, lighting and so on), a heat pump air-conditioner driven by commercial electricity was used for space cooling purposes, and a boiler fueled by town gas was used for warm water supplying and space heating purposes.
The cost "L" (yen) of using these energy sources is;
L=180X15+2.5X7.5=2720(yen).
Tracing back to primary energy in this case, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consurned in supplying the energy to be consumed in one hour is, since the heat energy generated from 1 ton of LNG
is 1.512X104 (kwh/ton - LNG);
I O M = (180kwh~0.36XO.75+2.5~ ~ (1.512XtO4kwh/ton - LNG) - 2.50X10-2 (ton- LNG).
Where environmental pollution is assessed with reference to NOx only, the quantity "N" of nitrogen oxides (NOx) released in the course of conversion from the primary energy, supply and consumption of these 1 S energy forms is, since nitrogen oxides (NOx) are released in 6.62X10-8 (tons) when 1 kwh commercial electricity is generated, and the quantity of nitrogen oxides (NOx) in exhaust gas from the boiler fueled by town gas is 11.91X10-8 tons per kwh boiler output;
N = 180 X 6.62 X 10-8 + 2 X 11.91 X 10-8 = 1 .215X10-5(ton - NOx).
2 0 A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained by substituting, in the foregoing expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c-2.0X104 (1/ton), as follows:
y=4.0X10~4X2719+80X2.50X10~2+2.0X104Xl.215X10-5=
1.088+2.0+0.243=3.33.
In the energy supply system according to the present invention, on the other hand, an overall index Is obtained as in the above case, using the amount of operalion ~xu (kwh) of th~ fuel cell as a parameter.
First, where 0~=x<=2, the heat exhausted from the fuel cell is used as part S of the heat energy {corresponding to "x" (kwh)~ for warm water supplying and space heating purposes, the boiler fueled by town gas is used for the remainder, and the electricity generated by the fuel cell is used to cover the amo~nt corresponding to ~xu (kwh) in the power demand. The order in which the heat and electricity are generated by the fuel cell is optional. It is assumed here that the heat generated by the fuel cell is used first for the warm water supply and then for the space cooling, with the electric power used for purposes other than the space cooling.
The cost "L"(yen) of using these energy sources is;
L = (1 80-x~ X 15 + (2-x) ~ 0.8 X 7.5 + x t 0.7 X 7.5 = 2719 - 5.63x (yen).
I S Therefore, if x=2, the cost is 2710 yen.
Ttacin~ back to primary energy, the quantity of fossil fuel (in terrns of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
M = {(180-x)~0.36X0.75+(2-x).0 8+x/0 4} . (1 512X104) = 2.50X10-2 2 () -5.51 X1 0-5x Therefore, if x=2, the quantity is 2 50X1 o-2.
The quantity "N" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, as well as supply and consumption of these energy forms is;
2 S N = (180-x) X 6 62 X 10-8 + (2-x) X 11 91 X 10 B = 1 21~X10-5-1 853X10-7x.
Therefore, if x=2, thequantity is 1.178X10-5.
A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients S a=4.0X10-4 (1/yen), b=80 ~11ton) and c=2.0X104 (1/ton), as follows:
y = 3.33 - 0.01037x.
If x=0, y=3.33. If x=2, y=3.31.
Next, where 2C=X<=92, the heat exhausted from the fuel cell is used as sole heat energy for the warm water supplyiny and space hea~ing purposes, I 0 the absorption heater/cooler driven by the exhaust heat from the fuel cell to provide part of space cooling energy {(x-2)/2.5}, and the elec~ric power generated by the fuel cell is used to cover the amount corresponding to "x"
(kwh) in the power demand.
The cost "L" (yen) of using these energy sources is;
l S L = {(144-x)+35-(x-2)~2.5} X 15 + x+ 0.4 X 7.5 = 2712 - 2.25x (yen).
Therefore, if x=2, the cost is 2710 yen. If x=92, the cost is 2505 yen.
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
2 0 M = 1{(144-x)+36-(x-2)~2.5} ~ 0.36 X 0.75 + x t 0.4] + (1.512X104) =
2.49X10-2-2.76X1 o-5x.
Therefore, if x=2, the quantity is 2.48X10-2. If x=92, the quantity is 2.24X10-2.
The quantity "N" (in tons) of nitrogen oxides ~NOx) reieased in the course of conversion from the primary energy, as well as supply and consumption of these energy forms is;
N= l{(144-x)+36-(x-2)~2.5} X 6.62 X 10-8 = 1.197X10-5-9.27X10-8x.
Therefore, if x=2, the quantity is 1 .178X10-5. If x=92, the quantity is 3.44X1 o-6.
A dimensionless overall index providing the objective function for optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c=2.0X104 (1/ton), as follows:
y = 3.32 - 4.96X1 o-3x.
If x=2, y=3.31. If x=92, y=2.86.
Next, where 92~=x<=144, the heat exhausted from the fuel cell is used as sole heat energy for the warm water supplying and space heating purposes, 1 5 the absorption heater/cooler driven by the exhaust heat from the fuel cell to provide all the space cooling energy, and the electric power generated by the fuel cell is used to cover the amount corresponding to "x" (kwh) in lhe power demand. Superfluous exhaust energy is left unused.
The cost "L" (yen) of using these energy sources is;
2 0 L = (144-x) X 15 + x ~ 0.4 X 7.5 = 2160 + 3.75x (yen).
Therefore, if x=92, the cost is 2510 yen. If x=144, the cost is 2700 yen.
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
2 5 M = ~(144-X)+0.36XO.75+XfO.4} f (1 .512X104) = 1.984X10-2+2.76X10-5x.
~D9~1~3 Therefore, if x=92, the quantity is 2.24X10-2. If x=144, the quantity is 2.38X10-2.
The quantity "N" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, as well as supply and consumption of S these energy forms is;
N = (144-x) X 6.62 X 10-8 = 9.53 X 104 - 6.62 X 10-8x.
Therefore, if x=92, the quantity is 3.44X1 o-6. If x=144, the quantity is -2.80X10-9.
A dimensionless overall index providing the objective function for l 0 optimizing operating conditions may be obtained, as in the preceding example, by substituting, in the expression y=aXL+bXM+cXN, the coefficients a=4.0X10-4 (1/yen), b=80 (1/ton) and c=2.0X104 (1/ton), as follows:
y = 2.64 + 2.38X10-3x.
If x=92, y=2.86. If x=144, y=2.98.
l S Fig. 3 shows a graph plotted using the overall index for the range x = 0 to 144 as function of "x".
It will be seen from the results that the expression -y" is minimized when x=92, i.e. in the condition in which the fuel cell is operated at 92kwh to produce the exhaust heat just covering all the heat energy for warm water 2 0 supplying and space heating purposes and the space cooling energy. This condition is optimal.
The operation in this condition during the one hour from 12:00 to 13:00 produces the following results, in relation to the comparative example:
the energy cost is 2510 ~ 2720 X 100 - 92.3%, 2 5 the quantity of fossil fuel is 2.24 X 1 o-2, 2.50 X 1 o-2 X 100 = 89.6%, and the quantity of nitrogen oxides (NOx) is 3.44 X 1 o-6 + 1.215 X 10-5 X 100 =
28.3%.
Thus, this embodiment achieves reductions in the energy cost, primary energy and environmental pollutants.
SECOND COMPARATIVE EXPERIMENT
In the second comparative experiment, a day (in summer) which records a maximum power demand of the year was considered.
Fig. 4 shows a demand pattern of heat energy for warm water supply on such a day. Fig. 5 shows demand patterns of electricity and of space cooling 1 0 energy on the same day.
The cost UL" (yen) of using these energy sources in these patterns is;
L = 2042 X 15 + 28 ~ 0.8 X 7.5 = 30900 (yen), where "2042" is the electric power demand for the day derived from Fig. 7, and "28" is the heat demand for the day derived from Fig. 6, both in kwh.
l 5 Tracing back to primary energy in this case, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one hour is;
M= (2042+0.36X0.75+28) + (1.512X104) = 0.283 (ton - LNG).
The quantity "N" ~in tons) of nitrogen oxides (NOx) released in the course 2 0 of conversion from the primary energy, supply and consumption of these energy forms is;
N = 2042 X 6.62 X 1 o~8 + 28 X 11.91 X 1 o-s = 1.385X10-4 (ton - NOx).
In the energy supply system according to the present invention, on the other hand, the operating condition of the fuel cell was optimized in 2 5 accordance with the energy demand patterns shown in Figs. 4 and 5, by the same computing method as in the first comparative example. Results were obtained as shown in the fuel cell operating pattern in Fig. 6 and the commercial electricity intake pattern in Fig. 7.
The cost "L" (yen) of using energy based on these patterns is;
S L = 796 X 15 + 898 + 0.4 X 7.5 = 28800 (yen).
Tracing back to primary energy, the quantity of fossil fuel (in terms of LNG) "M" (in tons) consumed in supplying the energy to be consumed in one llour is;
M= (796~0.36X0.75~898Ø4) ~ (1.512X104) = 0.258.
I 0 The quantity HN" (in tons) of nitrogen oxides (NOx) released in the course of conversion from the primary energy, supply and consumption of these energy forms is;
N = 796 X 6.62 X 10-8 = 5.27X10-5.
These results show that on the day which records the maximum power I S demand of the year;
the energy cost is 28800 + 30900 X 100 = 93.2%, the quantity of fossil fuel is 0.258 . 2.285 X 100 = 91.2%, and the quantity of nitrogen oxides (NOx) is 5.27 X 10-5 + 1.385 X 10-4 X 100 =
38.1 %, 2 0 with respect to the comparative example. Thus, this embodiment achieves improvelnent in energy eHiciency.
Since the maximum power intake is drastically reduced from 180kwh to 57kwh, the contract demand may be diminished from 200kwh to 100kwh.
Moreover, ~he commercial electricity intake pattern is leveled to make a great contribution toward improvement in the availability factor of commercial electricity generating facilities.
In the described embodiment, LNG is used as primary energy. It is possible to use fossil energy derived from LNG, coal or petroleum, atomic 5 energy from uranium, or hydraulic energy from hydropower generating plants, or a combination of some of these energy forms. In such a case, the cost of energy, the quantity of fuel in terms of LNG, and the quantities of C02 and NOx may be computed accordingly.
The foregoing embodiment may include a boiler or a cold nuclear fusion l O apparatus added to the system to act as an in-systern heat generator for meeting heat shortages when the heat load of the heat consuming equipment is greater than the heat generated by the in-system power generator. Needless to say, a boiler is usable as an in-system heat generator. Fuels usable for the boiler include natural gas, town gas, heavy 1 5 oil, light oil, coal and city waste. The boiler may be a heat recovery boiler provided for a city waste incinerator. The in-system heat generator may be a heat exchanger using, as a heat source, a warm fluid such as steam or warm water produced by a separate boilef. A cold nuclear fusion apparatus has been attracting attention since 1989 when Fleismann and Pons, and Jones 2 0 et al reported cold nuclear fusion.
For example, PCT WO 90/10935 discloses a method and apparatus for generating a large quantity of heat by nuclear fusion. According to this publication, an electrolysis of heavy water is carried out using platinum or thelike as the anode and palladium or the like as tl1e cathode, wherein nuclear 2 5 fusion is caused with a significant probability by filling the crystal lattice of "-palladium with heavy water atoms to make atomic nuclei of heavy water anomalously approach one another. The quantity of heat thereby generated exceeds the energy required for the electrolysis. Thus, a cold nuclear fusion apparatus may be used as a heat generator in the system according to the 5 present invention.
In this way, a boiler or a cold nuclear fusion apparatus may be used to meet heat shortages when the heat load of the heat consuming equipment is greater than the heat generated by the in-system power generator.
The heat derived from the boiler may be used when the heat load of the 10 heat consuming equipment temporarily exceeds the heat generated by the in-system power generator. The cold nuclear fusion apparatus may be used in the event of regular heat shortages.
Then, the heat obtained from the boiler or low nuclear fusion apparatus is supplemented when the heat demand temporarily increases and the heat 1 5 load of the heat consuming equipment becomes greater than the heat available from the in-system power generator. This is economical in that a small in-syslelrl power gerl~ralor is suf~icienl, inslead of necessilatirlg an in-system power generator capable of meeting the maximum heal demand.
Setting of coefficients"a", "b" and "c" to the expression "y" (initial setting 2 0 and setting changes) and operation controls may be provided from a central control unit (central control room, central control panel or the like) through wiring such as an exclusive communication line, telephone line, power line or CAlV, or by radio. Such controls include selection of energy consuming installations (power consuming equipment or heat consuming equipment) used by the energy consumer, energy selection (electricity or heat), load control, and control of varied devices such as valves.
This allows the coefficient setting and operation controls to be effected from a remote location, thereby controlling the system in a subtle and precise 5 manner for its optimal operation.
An absorption heater/cooler may be installed adjacent the in-system generator, such as a cogeneration system using an engine or a turbine, a fuel cell or the like, to use the heat generated by the in-system generator as aheat source. Warm or cold water or warm or cold air thereby produced may 1 0 be supplied to the energy consumer through piping or ducting. This is merely a question of thermal conversion or location for installing or a thermal converter, and therefore is one form of the present invention.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, 1 5 reference should be made to the appended claims, rather than to the foregoing specification, as indicating the scope of the invention.
Claims (47)
1. An energy supply system having a power receiving equipment for receiving electric power from a power plant, at least an in-system power generating device for generating power and heat by using a fuel received at a fuel receiving device, a power supplying device for supplying, in system interconnection, the power received at the power receiving equipment and the power generated by the in-system power generating device to a power GonSuming installation, and a heat supplying device for supplying the heat generated by the in-system power generating device to a heat consuming installation, said energy supply system comprising:
operation amount computing means for computing an amount of operation of said in-system power generating device to minimize an equation "y" set out hereunder when meeting an energy demand of an energy consumer;
and control means for controlling said in-system power generating device to satisfy the amount of operation computed by said operation amount computing means;
y=aXL+bXM+cXN, where "a", "b" and "c" are weighting coefficients a>=0, b>=0 and c>=0, which do not become zero at the same time, "L" is an energy cost borne by the energy consumer when said energy demand is met, "M" is a calculated total quantity of primary energy consumed to meet said energy demand, and "N" is a calculated total quantity of environmental pollutants released when said energy demand is met.
operation amount computing means for computing an amount of operation of said in-system power generating device to minimize an equation "y" set out hereunder when meeting an energy demand of an energy consumer;
and control means for controlling said in-system power generating device to satisfy the amount of operation computed by said operation amount computing means;
y=aXL+bXM+cXN, where "a", "b" and "c" are weighting coefficients a>=0, b>=0 and c>=0, which do not become zero at the same time, "L" is an energy cost borne by the energy consumer when said energy demand is met, "M" is a calculated total quantity of primary energy consumed to meet said energy demand, and "N" is a calculated total quantity of environmental pollutants released when said energy demand is met.
2. An energy supply system as defined in claim 1, further comprising an in-system heat generating device besides said in-system power generating device, wherein heat generated by said in-system heat generating device also is supplied to said heat consuming installation.
3. An energy supply system as defined in claim 1, further comprising combustible gas receiving means, wherein a customer heat consuming installation is provided as an energy consuming installation of the energy consumer to use as a heat source a combustible gas received at said combustible gas receiving means and/or said power or said heat, said energy demand including an energy demand of said customer heat consuming installation.
4. An energy supply system as defined in claim 1, wherein said equation "y"
is in form of y = a X L.
is in form of y = a X L.
5. An energy supply system as defined in claim 1, wherein said equation "y"
is in form of y = b X M.
is in form of y = b X M.
6. An energy supply system as defined in claim 1, wherein said equation "y"
is in form of y = c X N.
is in form of y = c X N.
7. An energy supply system as defined in claim 1, wherein said in-system power generating device includes at least a fuel cell.
8. An energy supply system as defined in claim 1, further comprising heat storage means for storing superfluous heat generated by said in-system power generating device, and heat replenishment means for supplying the heat stored in said storage means to said heat consuming installation.
9. An energy supply system as defined in claim 1, further comprising electricity-to-heat converting means operable, when the heat load of said heat consuming installation is greater than a quantity of heat produced from said in-system power generating device, to compensate for a heat shortage with thermal conversion of superfluous power.
10. An energy supply system as defined in claim 1, further comprising power storage means for storing part of the power supplied from said power receiving equipment or part of the power generated by said in-system power generating device at a time of low power demand, and power replenishment means for supplying the power stored in said power storage means to said power consuming installation.
11. An energy supply system as defined in claim 1, further comprising gas storage means for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power.
12. An energy supply system as defined in claim 1, further comprising back-current means for causing a back current of part of the power generated by said in-system power generating device when the power generated by said in-system power generating device exceeds a power demand.
13. An energy supply system as defined in claim 1, further comprising reform means for producing hydrogen gas from a hydrocarbon fuel received at said fuel receiving device.
14. An energy supply system as defined in claim 1, further comprising a solar cell connected to said power consuming installation.
15. An energy supply system as defined in claim 2, further comprising combustible gas receiving means, wherein a customer heat consuming installation is provided as an energy consuming installation of the energy consumer to use as a heat source a combustible gas received at said combustible gas receiving means and/or said power or said heat, said energy demand including an energy demand of said customer heat consuming installation.
16. An energy supply system as defined in claim 2, wherein said in-system power generating device includes at least a fuel cell.
17. An energy supply system as defined in claim 2, further comprising heat storage means for storing superfluous heat generated by said in-system power generating device, and heat replenishment means for supplying the heat stored in said storage means to said heat consuming installation.
18. An energy supply system as defined in claim 2, further comprising electricity-to-heat converting means operable, when the heat load of said heat consuming installation is greater than a quantity of heat produced from said in-system power generating device, to compensate for a heat shortage with thermal conversion of superfluous power.
19. An energy supply system as defined in claim 2, further comprising power storage means for storing part of the power supplied from said power receiving equipment or part of the power generated by said in-system power generating device at a time of low power demand, and power replenishment means for supplying the power stored in said power storage means to said power consuming installation.
20. An energy supply system as defined in claim 2, further comprising gas storage means for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power.
21. An energy supply system as defined in claim 2, further comprising back-current means for causing a back current of part of the power generated by said in-system power generating device when the power generated by said in-system power generating device exceeds a power demand.
22. An energy supply system as defined in claim 2, further comprising reform means for producing hydrogen gas from a hydrocarbon fuel received at said fuel receiving device.
23. An energy supply system as defined in claim 2, further comprising a solar cell connected to said power consuming installation.
24. An energy supply system as defined in claim 4, wherein said in-system power generating device includes at least a fuel cell.
25. An energy supply system as defined in claim 4, further comprising heat storage means for storing superfluous heat generated by said in-system power generating device, and heat replenishment means for supplying the heat stored in said storage means to said heat consuming installation.
26. An energy supply system as defined in claim 4, further comprising electricity-to-heat converting means operable, when the heat load of said heat consuming installation is greater than a quantity of heat produced from said in-system power generating device, to compensate for a heat shortage with thermal conversion of superfluous power.
27. An energy supply system as defined in claim 4, further comprising power storage means for storing part of the power supplied from said power receiving equipment or part of the power generated by said in-system power generating device at a time of low power demand, and power replenishment means for supplying the power stored in said power storage means to said power consuming installation.
28. An energy supply system as defined in claim 4, further comprising gas storage means for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power.
29. An energy supply system as defined in claim 4, further comprising back-current means for causing a back current of part of the power generated by said in-system power generating device when the power generated by said in-system power generating device exceeds a power demand.
30. An energy supply system as defined in claim 4, further comprising reform means for producing hydrogen gas from a hydrocarbon fuel received at said fuel receiving device.
31. An energy supply system as defined in claim 4, further comprising a solar cell connected to said power consuming installation.
32. An energy supply system as defined in claim 5, wherein said in-system power generating device includes at least a fuel cell.
33. An energy supply system as defined in claim 5, further comprising heat storage means for storing superfluous heat generated by said in-system power generating device, and heat replenishment means for supplying the heat stored in said storage means to said heat consuming installation.
34. An energy supply system as defined in claim 5, further comprising electricity-to-heat converting means operable, when the heat load of said heat consuming installation is greater than a quantity of heat produced from said in-system power generating device, to compensate for a heat shortage with thermal conversion of superfluous power.
35. An energy supply system as defined in claim 5, further comprising power storage means for storing part of the power supplied from said power receiving equipment or part of the power generated by said in-system power generating device at a time of low power demand, and power replenishment means for supplying the power stored in said power storage means to said power consuming installation.
36. An energy supply system as defined in claim 5, further comprising gas storage means for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power.
37. An energy supply system as defined in claim 5, further comprising back-current means for causing a back current of part of the power generated by said in-system power generating device when the power generated by said in-system power generating device exceeds a power demand.
38. An energy supply system as defined in claim 5, further comprising reform means for producing hydrogen gas from a hydrocarbon fuel received at said fuel receiving device.
39. An energy supply system as defined in claim 5, further comprising a solar cell connected to said power consuming installation.
40. An energy supply system as defined in claim 6, wherein said in-system power generating device includes at least a fuel cell.
41. An energy supply system as defined in claim 6, further comprising heat storage means for storing superfluous heat generated by said in-system power generating device, and heat replenishment means for supplying the heat stored in said storage means to said heat consuming installation.
42. An energy supply system as defined in claim 6, further comprising electricity-to-heat converting means operable, when the heat load of said heat consuming installation is greater than a quantity of heat produced from said in-system power generating device, to compensate for a heat shortage with thermal conversion of superfluous power.
43. An energy supply system as defined in claim 6, further comprising power storage means for storing part of the power supplied from said power receiving equipment or part of the power generated by said in-system power generating device at a time of low power demand, and power replenishment means for supplying the power stored in said power storage means to said power consuming installation.
44. An energy supply system as defined in claim 6, further comprising gas storage means for storing at least hydrogen gas generated along with oxygen gas through an electrolysis of water carried out by using superfluous power.
45. An energy supply system as defined in claim 6, further comprising back-current means for causing a back current of part of the power generated by said in-system power generating device when the power generated by said in-system power generating device exceeds a power demand.
46. An energy supply system as defined in claim 6, further comprising reform means for producing hydrogen gas from a hydrocarbon fuel received at said fuel receiving device.
47. An energy supply system as defined in claim 6, further comprising a solar cell connected to said power consuming installation.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11401492 | 1992-04-06 | ||
JP4-114014 | 1992-04-06 | ||
JP5-29966 | 1993-01-25 | ||
JP2996693A JP2888717B2 (en) | 1992-04-06 | 1993-01-25 | Energy supply system |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2093193A1 CA2093193A1 (en) | 1993-10-07 |
CA2093193C true CA2093193C (en) | 1996-06-04 |
Family
ID=26368218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002093193A Expired - Fee Related CA2093193C (en) | 1992-04-06 | 1993-04-01 | Energy supply system |
Country Status (5)
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US (1) | US5432710A (en) |
EP (1) | EP0568822B1 (en) |
JP (1) | JP2888717B2 (en) |
CA (1) | CA2093193C (en) |
DE (1) | DE69316260T2 (en) |
Families Citing this family (186)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5790420A (en) * | 1989-12-14 | 1998-08-04 | Lang; Fred D. | Methods and systems for improving thermal efficiency, determining effluent flows and for determining fuel mass flow rates of a fossil fuel fired system |
US5621654A (en) * | 1994-04-15 | 1997-04-15 | Long Island Lighting Company | System and method for economic dispatching of electrical power |
DE19608738C1 (en) * | 1996-03-06 | 1997-06-26 | Siemens Ag | Method of utilising e.g. low temp. polymer membrane (PEM) fuel cell enthalpy |
US6054229A (en) * | 1996-07-19 | 2000-04-25 | Ztek Corporation | System for electric generation, heating, cooling, and ventilation |
US5880677A (en) * | 1996-10-15 | 1999-03-09 | Lestician; Guy J. | System for monitoring and controlling electrical consumption, including transceiver communicator control apparatus and alternating current control apparatus |
AT406427B (en) * | 1996-10-24 | 2000-05-25 | Vaillant Gmbh | WATER HEATER |
US6537352B2 (en) | 1996-10-30 | 2003-03-25 | Idatech, Llc | Hydrogen purification membranes, components and fuel processing systems containing the same |
US6783741B2 (en) | 1996-10-30 | 2004-08-31 | Idatech, Llc | Fuel processing system |
US6494937B1 (en) | 2001-09-27 | 2002-12-17 | Idatech, Llc | Hydrogen purification devices, components and fuel processing systems containing the same |
US6376113B1 (en) | 1998-11-12 | 2002-04-23 | Idatech, Llc | Integrated fuel cell system |
US7195663B2 (en) | 1996-10-30 | 2007-03-27 | Idatech, Llc | Hydrogen purification membranes, components and fuel processing systems containing the same |
EP0958628B1 (en) * | 1996-11-13 | 2006-06-28 | Minnesota Mining And Manufacturing Company | Storage and delivery of pressurized gases in microbubbles |
US5753383A (en) * | 1996-12-02 | 1998-05-19 | Cargnelli; Joseph | Hybrid self-contained heating and electrical power supply process incorporating a hydrogen fuel cell, a thermoelectric generator and a catalytic burner |
US6598029B1 (en) | 1997-02-24 | 2003-07-22 | Geophonic Networks, Inc. | Bidding for energy supply with request for service |
US6021402A (en) * | 1997-06-05 | 2000-02-01 | International Business Machines Corporaiton | Risk management system for electric utilities |
US5999888A (en) * | 1997-06-09 | 1999-12-07 | Alternate Energy Corporation | Automated control system for managing multiple energy sources |
FR2770339B1 (en) | 1997-10-27 | 2003-06-13 | Commissariat Energie Atomique | STRUCTURE HAVING FORMED ELECTRIC CONTACTS THROUGH THE SUBSTRATE OF THIS STRUCTURE AND METHOD OF OBTAINING SUCH A STRUCTURE |
US6282902B1 (en) * | 1997-10-28 | 2001-09-04 | Hitachi, Ltd. | Waste processing system and fuel reformer used in the waste processing system |
WO1999040310A1 (en) * | 1998-02-09 | 1999-08-12 | Whisper Tech Limited | Improvements in co-generation systems |
JP3700386B2 (en) * | 1998-04-15 | 2005-09-28 | 株式会社日立製作所 | Energy and power interchange system |
US6202935B1 (en) | 1998-04-15 | 2001-03-20 | Aos Holding Company | Combined potable water heater and hydronic heating system |
DE19821478A1 (en) * | 1998-05-14 | 1999-11-18 | Felix Huber | Device for oxidizing fuel containing hydrocarbons using of catalyzer without flame for supply of electrical energy and heat |
US6366889B1 (en) * | 1998-05-18 | 2002-04-02 | Joseph A. Zaloom | Optimizing operational efficiency and reducing costs of major energy system at large facilities |
US6311105B1 (en) | 1998-05-29 | 2001-10-30 | Powerweb, Inc. | Multi-utility energy control system |
US6122603A (en) * | 1998-05-29 | 2000-09-19 | Powerweb, Inc. | Multi-utility energy control system with dashboard |
US5985474A (en) | 1998-08-26 | 1999-11-16 | Plug Power, L.L.C. | Integrated full processor, furnace, and fuel cell system for providing heat and electrical power to a building |
JP4275259B2 (en) * | 1998-09-04 | 2009-06-10 | 株式会社Nttファシリティーズ | Control method and apparatus for building energy system and recording medium recording control processing program |
AT407452B (en) * | 1998-10-08 | 2001-03-26 | Vaillant Gmbh | EVAPORATOR |
AT406718B (en) * | 1998-10-08 | 2000-08-25 | Vaillant Gmbh | CHP POWER PLANT |
AT411805B (en) * | 1998-10-16 | 2004-05-25 | Vaillant Gmbh | METHOD FOR CONTROLLING A FUEL CELL ARRANGEMENT |
AT407314B (en) * | 1998-11-23 | 2001-02-26 | Vaillant Gmbh | FUEL CELL ARRANGEMENT |
US6067482A (en) * | 1999-01-08 | 2000-05-23 | Hussmann Corporation | Load shifting control system for commercial refrigeration |
US7716102B1 (en) * | 1999-03-11 | 2010-05-11 | Morgan Stanley Dean Witter & Co. | Method for managing risk in markets related to commodities delivered over a network |
CA2271448A1 (en) * | 1999-05-12 | 2000-11-12 | Stuart Energy Systems Inc. | Energy distribution network |
DE10030071A1 (en) * | 1999-06-17 | 2001-03-01 | Vaillant Joh Gmbh & Co | Fuel cell or fuel cell stack heat output regulation method uses required fuel cell power as electrical regulation signal for PID regulation |
BR0012768A (en) | 1999-07-27 | 2002-04-02 | Idatech Llc | Fuel cell system |
US6979507B2 (en) | 2000-07-26 | 2005-12-27 | Idatech, Llc | Fuel cell system controller |
US6510369B1 (en) * | 1999-08-24 | 2003-01-21 | Plug Power Inc. | Residential load shedding |
US6242120B1 (en) * | 1999-10-06 | 2001-06-05 | Idatech, Llc | System and method for optimizing fuel cell purge cycles |
US6383670B1 (en) * | 1999-10-06 | 2002-05-07 | Idatech, Llc | System and method for controlling the operation of a fuel processing system |
CA2387634A1 (en) * | 1999-10-12 | 2001-04-19 | General Hydrogen Corporation | Hydrogen/electric energy distribution system |
US6283067B1 (en) * | 1999-11-12 | 2001-09-04 | Aos Holding Company | Potable water temperature management system |
US6451464B1 (en) | 2000-01-03 | 2002-09-17 | Idatech, Llc | System and method for early detection of contaminants in a fuel processing system |
US6465118B1 (en) * | 2000-01-03 | 2002-10-15 | Idatech, Llc | System and method for recovering thermal energy from a fuel processing system |
US7430459B1 (en) * | 2000-02-01 | 2008-09-30 | Motorola, Inc. | System and method to control distributed power generation network |
JP2004129314A (en) * | 2000-03-17 | 2004-04-22 | Soichi Sato | Cogeneration system equipped with capacitor device |
US6915185B2 (en) | 2000-03-24 | 2005-07-05 | Matsushita Electric Industrial Co., Ltd. | Power supply system |
US6835481B2 (en) * | 2000-03-29 | 2004-12-28 | Idatech, Llc | Fuel cell system with load management |
US6723459B2 (en) | 2000-07-12 | 2004-04-20 | Sulzer Hexis Ag | Plant with high temperature fuel cells |
EP1172874A3 (en) * | 2000-07-12 | 2002-01-23 | Sulzer Hexis AG | High temperature fuel cells installation |
JP4630429B2 (en) * | 2000-07-14 | 2011-02-09 | ミサワホーム株式会社 | Building with fuel cell |
US6522955B1 (en) | 2000-07-28 | 2003-02-18 | Metallic Power, Inc. | System and method for power management |
JP2002095167A (en) * | 2000-09-14 | 2002-03-29 | Matsushita Electric Ind Co Ltd | Surplus power storing supplying apparatus |
AU2001296336A1 (en) * | 2000-09-26 | 2002-04-08 | Daniel S. Gluck | Automated new energy technology consulting and demand aggregation system and method |
JP2002125316A (en) * | 2000-10-13 | 2002-04-26 | Kurita Water Ind Ltd | Operation system for power generation facility |
US7201783B2 (en) * | 2000-11-13 | 2007-04-10 | Idatech, Llc | Fuel processing system and improved feedstock therefor |
US20020128747A1 (en) * | 2000-12-12 | 2002-09-12 | Ngk Insulators, Ltd. | Method for running electric energy storage system |
US6506510B1 (en) | 2000-12-15 | 2003-01-14 | Uop Llc | Hydrogen generation via methane cracking for integrated heat and electricity production using a fuel cell |
US6581015B2 (en) * | 2000-12-27 | 2003-06-17 | Plug Power, Inc. | Technique and apparatus to control the transient response of a fuel cell system |
US6697745B2 (en) * | 2000-12-27 | 2004-02-24 | Plug Power Inc. | Technique and apparatus to control the transient response of a fuel cell system |
US6882904B1 (en) * | 2000-12-29 | 2005-04-19 | Abb Technology Ag | Communication and control network for distributed power resource units |
US7294421B2 (en) | 2001-02-07 | 2007-11-13 | Delphi Technologies, Inc. | Solid oxide auxiliary power unit reformate control |
US20020114984A1 (en) * | 2001-02-21 | 2002-08-22 | Edlund David J. | Fuel cell system with stored hydrogen |
JP2002252926A (en) * | 2001-02-26 | 2002-09-06 | Toshiba Corp | Cogeneration apparatus operating system and energy supply method for the same |
US6569227B2 (en) * | 2001-09-27 | 2003-05-27 | Idatech, Llc | Hydrogen purification devices, components and fuel processing systems containing the same |
US20060037476A1 (en) * | 2001-03-08 | 2006-02-23 | Edlund David J | Hydrogen purification devices, components and fuel processing systems containing the same |
US6673479B2 (en) * | 2001-03-15 | 2004-01-06 | Hydrogenics Corporation | System and method for enabling the real time buying and selling of electricity generated by fuel cell powered vehicles |
US6977119B2 (en) * | 2001-04-27 | 2005-12-20 | Plug Power Inc. | Fuel cell transient control scheme |
JP4650864B2 (en) * | 2001-05-08 | 2011-03-16 | 大阪瓦斯株式会社 | Cogeneration system operation control device |
EP1398842A4 (en) * | 2001-06-18 | 2004-10-20 | Matsushita Electric Ind Co Ltd | Cogeneration apparatus, cogeneration method, program, and medium |
US6890672B2 (en) | 2001-06-26 | 2005-05-10 | Idatech, Llc | Fuel processor feedstock delivery system |
WO2003007120A2 (en) * | 2001-07-11 | 2003-01-23 | Mazzarella Joseph R | A system and method for creating and operating an enhanced distributed energy network or virtual power plant |
JP2003047155A (en) * | 2001-07-31 | 2003-02-14 | Osaka Gas Co Ltd | Power feeding method |
JP4889167B2 (en) * | 2001-08-09 | 2012-03-07 | 大阪瓦斯株式会社 | Cogeneration system operation planning method |
US20030035984A1 (en) | 2001-08-15 | 2003-02-20 | Colborn Jeffrey A. | Metal fuel cell system for providing backup power to one or more loads |
DE10140603A1 (en) * | 2001-08-18 | 2003-03-20 | Ballard Power Systems | Method for the electrical power control of a fuel cell system |
CN1585953A (en) | 2001-09-13 | 2005-02-23 | Abb股份有限公司 | Method and system to calculate a demand for electric power |
JP4560253B2 (en) * | 2001-09-17 | 2010-10-13 | 大阪瓦斯株式会社 | Cogeneration facility operation method |
US6689711B2 (en) | 2001-10-09 | 2004-02-10 | Metallic Power, Inc. | Methods of producing oxygen reduction catalyst |
US6911274B1 (en) | 2001-10-19 | 2005-06-28 | Metallic Power, Inc. | Fuel cell system |
US6679280B1 (en) | 2001-10-19 | 2004-01-20 | Metallic Power, Inc. | Manifold for fuel cell system |
US7632321B2 (en) * | 2001-11-01 | 2009-12-15 | Idatech, Llc | Fuel processing systems, fuel cell systems, and improved feedstocks therefor |
JP2003229159A (en) * | 2002-01-31 | 2003-08-15 | Toyota Motor Corp | Fuel cell generation system and operation display device used for the same |
WO2003069758A1 (en) | 2002-02-14 | 2003-08-21 | Yanmar Co.,Ltd. | Power generator and system comprising it |
US20030167690A1 (en) * | 2002-03-05 | 2003-09-11 | Edlund David J. | Feedstock delivery system and fuel processing systems containing the same |
US6873157B2 (en) * | 2002-04-04 | 2005-03-29 | Metallic Power, Inc. | Method of and system for determining the remaining energy in a metal fuel cell |
US20030223926A1 (en) | 2002-04-14 | 2003-12-04 | Edlund David J. | Steam reforming fuel processor, burner assembly, and methods of operating the same |
US20050256776A1 (en) * | 2002-04-30 | 2005-11-17 | Bayoumi Deia S | Industrial it system for production of distribution power transformers |
US20060052888A1 (en) * | 2002-04-30 | 2006-03-09 | Bayoumi Deia S | Industrial it system for distribution power transformers manufacturing material control with suppliers systems integration |
US20060015349A1 (en) * | 2002-04-30 | 2006-01-19 | Salah-Eldin Bayoumi | Transformer manufacturing optimized planning across the manufacturing plants using artificial intelligence |
WO2003093934A2 (en) * | 2002-04-30 | 2003-11-13 | Abb Research Ltd. | Industrial it system for production of distribution power transformers |
US6764588B2 (en) * | 2002-05-17 | 2004-07-20 | Metallic Power, Inc. | Method of and system for flushing one or more cells in a particle-based electrochemical power source in standby mode |
US7128769B2 (en) * | 2002-06-27 | 2006-10-31 | Idatech, Llc | Methanol steam reforming catalysts, steam reformers, and fuel cell systems incorporating the same |
JP3753113B2 (en) * | 2002-08-23 | 2006-03-08 | 三菱電機株式会社 | Generator control device |
US20040081867A1 (en) * | 2002-10-23 | 2004-04-29 | Edlund David J. | Distributed fuel cell network |
US20040081868A1 (en) * | 2002-10-23 | 2004-04-29 | Edlund David J. | Distributed fuel cell network |
CA2420571C (en) * | 2003-02-28 | 2011-09-27 | Gary Howard | Hydrogen storage system and power system incorporating same |
US20040197616A1 (en) * | 2003-04-01 | 2004-10-07 | Edlund David J. | Oxidant-enriched fuel cell system |
US7250231B2 (en) * | 2003-06-09 | 2007-07-31 | Idatech, Llc | Auxiliary fuel cell system |
US20040253495A1 (en) * | 2003-06-11 | 2004-12-16 | Laven Arne | Fuel cell device condition detection |
US20050084388A1 (en) * | 2003-07-17 | 2005-04-21 | Hayes Alan E. | Positive displacement liquid pump |
EP1511108B1 (en) * | 2003-08-29 | 2006-12-27 | Matsushita Electric Industrial Co., Ltd. | Cogeneration system, operation controller for cogeneration facility, and operation program for cogeneration facility |
DE10349090A1 (en) * | 2003-10-22 | 2005-06-16 | Eisenmann Maschinenbau Gmbh & Co. Kg | Plant and method for drying objects |
JP2007018022A (en) * | 2003-10-27 | 2007-01-25 | Aisin Seiki Co Ltd | Cogeneration introduction simulation method and system, and cogeneration apparatus sales promotion method and system |
JP2007523580A (en) | 2004-01-23 | 2007-08-16 | スチュアート エナジー システムズ コーポレーション | Energy network |
CA2455689A1 (en) * | 2004-01-23 | 2005-07-23 | Stuart Energy Systems Corporation | System for controlling hydrogen network |
US20050188616A1 (en) * | 2004-02-27 | 2005-09-01 | Bizjak Travis A. | Fuel processing treatment system and fuel processing systems containing the same |
JP2005261123A (en) * | 2004-03-12 | 2005-09-22 | Tokyo Gas Co Ltd | Control method and control system of power system |
WO2005089257A2 (en) * | 2004-03-16 | 2005-09-29 | Tecogen, Inc. | Engine driven power inverter system with cogeneration |
US20050240427A1 (en) * | 2004-04-26 | 2005-10-27 | Crichlow Henry B | Energy management method and process using analytic metrics. |
US7842428B2 (en) | 2004-05-28 | 2010-11-30 | Idatech, Llc | Consumption-based fuel cell monitoring and control |
US8277997B2 (en) * | 2004-07-29 | 2012-10-02 | Idatech, Llc | Shared variable-based fuel cell system control |
US8019445B2 (en) * | 2004-06-15 | 2011-09-13 | Intelligent Generation Llc | Method and apparatus for optimization of distributed generation |
US7444189B1 (en) * | 2004-06-15 | 2008-10-28 | John Joseph Marhoefer | Method and apparatus for simultaneous optimization of distributed generation and hydrogen production |
US7288921B2 (en) | 2004-06-25 | 2007-10-30 | Emerson Process Management Power & Water Solutions, Inc. | Method and apparatus for providing economic analysis of power generation and distribution |
EP1780823B1 (en) * | 2004-07-13 | 2013-12-04 | Panasonic Corporation | Control unit for fuel-cell power generation apparatus, and control method, control program and computer-readable record medium with control program for the same |
US20060047607A1 (en) * | 2004-08-27 | 2006-03-02 | Boyden Scott A | Maximizing profit and minimizing losses in controlling air pollution |
US7297183B2 (en) * | 2004-09-20 | 2007-11-20 | Idatech, Llc | Hydrogen purification devices, components, and fuel processing systems containing the same |
US9771834B2 (en) * | 2004-10-20 | 2017-09-26 | Emerson Process Management Power & Water Solutions, Inc. | Method and apparatus for providing load dispatch and pollution control optimization |
US7470293B2 (en) | 2004-10-29 | 2008-12-30 | Idatech, Llc | Feedstock delivery systems, fuel processing systems, and hydrogen generation assemblies including the same |
US20060093890A1 (en) * | 2004-10-29 | 2006-05-04 | Steinbroner Matthew P | Fuel cell stack compression systems, and fuel cell stacks and fuel cell systems incorporating the same |
US7567859B2 (en) * | 2004-12-01 | 2009-07-28 | Honeywell International Inc. | Methods and apparatuses for control of building cooling, heating and power co-generation systems |
JP4565468B2 (en) * | 2005-03-23 | 2010-10-20 | 東京瓦斯株式会社 | Cogeneration system |
US7632322B2 (en) | 2005-06-07 | 2009-12-15 | Idatech, Llc | Hydrogen-producing fuel processing assemblies, heating assemblies, and methods of operating the same |
JP5009156B2 (en) * | 2005-06-16 | 2012-08-22 | パナソニック株式会社 | Load control device, load control method, load control circuit, load control program, and computer-readable recording medium recording load control program |
US7573253B2 (en) * | 2005-07-29 | 2009-08-11 | Dmi Manufacturing Inc. | System for managing electrical consumption |
US20100061028A1 (en) * | 2005-07-29 | 2010-03-11 | Guy J. Lestician | System for managing electrical consumption with coaxial communication line protection |
US8003270B2 (en) | 2005-08-17 | 2011-08-23 | Idatech, Llc | Fuel cell stacks and systems with fluid-responsive temperature regulation |
US20070042233A1 (en) * | 2005-08-19 | 2007-02-22 | Lyman Scott W | Systems and methods for initiating auxiliary fuel cell system operation |
US20070044657A1 (en) * | 2005-09-01 | 2007-03-01 | Laven Arne | Fuel cell systems and methods for passively increasing hydrogen recovery through vacuum-assisted pressure swing adsorption |
US7601302B2 (en) | 2005-09-16 | 2009-10-13 | Idatech, Llc | Self-regulating feedstock delivery systems and hydrogen-generating fuel processing assemblies and fuel cell systems incorporating the same |
EP1938415B1 (en) | 2005-09-16 | 2014-05-14 | Dcns Sa | Self-regulating feedstock delivery system and hydrogen-generating fuel processing assembly incorporating the same |
US7659019B2 (en) * | 2005-09-16 | 2010-02-09 | Idatech, Llc | Thermally primed hydrogen-producing fuel cell system |
US20070112694A1 (en) * | 2005-11-14 | 2007-05-17 | Sempa Power Systems Ltd. | Facility energy management system |
US20080023564A1 (en) * | 2006-04-28 | 2008-01-31 | Robert Charles Hall | Method And Apparatus For Centrally Controlling A Hybrid Furnace, Heater, And Boiler System Installation |
US7887958B2 (en) * | 2006-05-15 | 2011-02-15 | Idatech, Llc | Hydrogen-producing fuel cell systems with load-responsive feedstock delivery systems |
US7629067B2 (en) * | 2006-05-22 | 2009-12-08 | Idatech, Llc | Hydrogen-producing fuel processing systems and fuel cell systems with a liquid leak detection system |
US7972420B2 (en) | 2006-05-22 | 2011-07-05 | Idatech, Llc | Hydrogen-processing assemblies and hydrogen-producing systems and fuel cell systems including the same |
US20070275275A1 (en) * | 2006-05-23 | 2007-11-29 | Mesa Scharf | Fuel cell anode purge systems and methods |
US7939051B2 (en) | 2006-05-23 | 2011-05-10 | Idatech, Llc | Hydrogen-producing fuel processing assemblies, heating assemblies, and methods of operating the same |
WO2008100581A1 (en) * | 2007-02-13 | 2008-08-21 | Greg Bailey | Energy financial reconciliation system and method |
US7754361B2 (en) | 2007-05-30 | 2010-07-13 | Idatech, Llc | Fuel cell systems with maintenance hydration by displacement of primary power |
US8034500B2 (en) * | 2007-05-30 | 2011-10-11 | Idatech, Llc | Systems and methods for starting and operating fuel cell systems in subfreezing temperatures |
US20080299423A1 (en) * | 2007-05-30 | 2008-12-04 | Laven Arne | Fuel cell systems with maintenance hydration |
DE102007037672A1 (en) * | 2007-08-09 | 2009-02-12 | Werner Leonhard | Energy distribution method comprises applying renewable energy in electric circuit for producing hydrogen, hydrogenating the hydrogen to produce combustible hydrocarbon and applying hydrocarbon in power plant to produce electric current |
JP5144169B2 (en) * | 2007-08-17 | 2013-02-13 | 本田技研工業株式会社 | Cogeneration equipment |
KR100968581B1 (en) * | 2007-11-27 | 2010-07-08 | (주)퓨얼셀 파워 | Combined Heat and Power Co-generation System for Fuel Cell and Operating Method Thereof |
US8070841B2 (en) * | 2007-12-12 | 2011-12-06 | Idatech, Llc | Systems and methods for supplying auxiliary fuel streams during intermittent byproduct discharge from pressure swing adsorption assemblies |
US7837765B2 (en) * | 2007-12-12 | 2010-11-23 | Idatech, Llc | Systems and methods for supplying auxiliary fuel streams during intermittent byproduct discharge from pressure swing adsorption assemblies |
US8262752B2 (en) | 2007-12-17 | 2012-09-11 | Idatech, Llc | Systems and methods for reliable feedstock delivery at variable delivery rates |
JP5178242B2 (en) | 2008-02-29 | 2013-04-10 | 株式会社東芝 | Energy storage device operation plan creation method and operation plan creation device |
US8021447B2 (en) * | 2008-07-30 | 2011-09-20 | Idatech, Llc | Hydrogen-producing assemblies |
EP2163735A1 (en) * | 2008-08-21 | 2010-03-17 | C.R.F. Società Consortile per Azioni | System and method for multi-objective management of the electrical and thermal energy gernerated by a co/trigeneration energy system in a multi-source energy plant |
US9017436B2 (en) | 2008-08-26 | 2015-04-28 | Dcns | Fuel processing systems with thermally integrated componentry |
US20100055518A1 (en) * | 2008-08-26 | 2010-03-04 | Idatech, Llc | Hydrogen-producing assemblies, fuel cell systems including the same, methods of producing hydrogen gas, and methods of powering an energy-consuming device |
US8083819B2 (en) * | 2008-08-27 | 2011-12-27 | Idatech, Llc | Hydrogen-producing fuel processing and fuel cell systems with a temperature-responsive automatic valve system |
US20100055508A1 (en) * | 2008-08-27 | 2010-03-04 | Idatech, Llc | Fuel cell systems with water recovery from fuel cell effluent |
DE102009011778A1 (en) * | 2009-03-09 | 2010-09-23 | Gerhard Prinz | Power system |
WO2010134356A1 (en) * | 2009-05-21 | 2010-11-25 | パナソニック株式会社 | Hydrogen generation system and hot water production system |
CA2763171C (en) | 2009-06-12 | 2013-11-26 | Idatech, Llc | Systems and methods for independently controlling the operation of fuel cell stacks and fuel cell systems incorporating the same |
US8244505B2 (en) * | 2009-11-05 | 2012-08-14 | General Electric Company | Predicting NOx emissions |
US9190873B2 (en) * | 2009-11-30 | 2015-11-17 | Kyocera Corporation | Control system, correction device, and power control method |
US8492042B2 (en) * | 2009-12-02 | 2013-07-23 | Idatech, Llc | Fuel cell systems and methods for providing power and cooling to an energy-consuming device |
US8790618B2 (en) * | 2009-12-17 | 2014-07-29 | Dcns Sa | Systems and methods for initiating operation of pressure swing adsorption systems and hydrogen-producing fuel processing systems incorporating the same |
US8790840B2 (en) * | 2010-03-10 | 2014-07-29 | Dcns Sa | Systems and methods for fuel cell thermal management |
US8920996B2 (en) | 2010-05-11 | 2014-12-30 | Dcns | Systems and methods for regulating fuel cell air flow during low loads or cold temperature operation |
US8449649B2 (en) | 2010-05-11 | 2013-05-28 | Idatech, Llc | Systems and methods for starting up pressure swing adsorption assemblies and hydrogen-producing fuel processing systems including the same |
US8673510B2 (en) | 2010-10-11 | 2014-03-18 | Dcns Sa | Systems and methods for maintaining hydrogen-selective membranes during periods of inactivity |
JP2012095501A (en) * | 2010-10-28 | 2012-05-17 | Hitachi Ltd | Load distributing device |
US8920732B2 (en) | 2011-02-15 | 2014-12-30 | Dcns | Systems and methods for actively controlling steam-to-carbon ratio in hydrogen-producing fuel processing systems |
US8429003B2 (en) | 2011-04-21 | 2013-04-23 | Efficiency3 Corp. | Methods, technology, and systems for quickly enhancing the operating and financial performance of energy systems at large facilities; interpreting usual and unusual patterns in energy consumption; identifying, quantifying, and monetizing hidden operating and financial waste; and accurately measuring the results of implemented energy management solutions-in the shortest amount of time with minimal cost and effort |
US11050249B2 (en) | 2012-03-23 | 2021-06-29 | Concentric Power, Inc. | Systems and methods for power cogeneration |
US9388766B2 (en) | 2012-03-23 | 2016-07-12 | Concentric Power, Inc. | Networks of cogeneration systems |
US10214821B2 (en) * | 2012-05-28 | 2019-02-26 | Hydrogenics Corporation | Electrolyser and energy system |
JP6166894B2 (en) * | 2012-12-27 | 2017-07-19 | 川崎重工業株式会社 | Optimal control apparatus and method for complex energy system |
CN103198206B (en) * | 2013-02-25 | 2016-06-15 | 同济大学 | A kind of fuel cell system method of evaluating performance based on combination property score model |
JP2015111374A (en) * | 2013-12-06 | 2015-06-18 | 株式会社東芝 | Social infrastructure control system and social infrastructure control method |
CN103942728B (en) * | 2014-04-11 | 2017-02-08 | 武汉大学 | Cascade hydropower station group daily power generation plan making method |
US20160028096A1 (en) * | 2014-07-25 | 2016-01-28 | Cummins Power Generation Ip, Inc. | System and method for increasing the efficiency for a solid oxide fuel cell system |
US10476093B2 (en) | 2016-04-15 | 2019-11-12 | Chung-Hsin Electric & Machinery Mfg. Corp. | Membrane modules for hydrogen separation and fuel processors and fuel cell systems including the same |
US11875371B1 (en) | 2017-04-24 | 2024-01-16 | Skyline Products, Inc. | Price optimization system |
US11493211B2 (en) * | 2017-11-06 | 2022-11-08 | Anderson Industries, Llc | Fuel cell heater system |
US11316180B2 (en) | 2020-05-21 | 2022-04-26 | H2 Powertech, Llc | Hydrogen-producing fuel cell systems and methods of operating hydrogen-producing fuel cell systems for backup power operations |
US11618676B2 (en) | 2020-10-23 | 2023-04-04 | H2 Powertech, Llc | Systems and methods for increasing the hydrogen permeance of hydrogen-separation membranes in situ |
US11712655B2 (en) | 2020-11-30 | 2023-08-01 | H2 Powertech, Llc | Membrane-based hydrogen purifiers |
US11936327B2 (en) | 2021-06-23 | 2024-03-19 | Tecogen Inc. | Hybrid power system with electric generator and auxiliary power source |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5647169Y2 (en) * | 1979-02-10 | 1981-11-05 | ||
US4341607A (en) * | 1980-12-08 | 1982-07-27 | E:F Technology, Inc. | Solar power system requiring no active control device |
US4680478A (en) * | 1984-12-31 | 1987-07-14 | Wicks Frank E | Efficient fuel utilization system |
US4802100A (en) * | 1986-08-18 | 1989-01-31 | Gas Research Institute | Advanced cogeneration control system |
US4752697A (en) * | 1987-04-10 | 1988-06-21 | International Cogeneration Corporation | Cogeneration system and method |
JP2821760B2 (en) * | 1989-03-17 | 1998-11-05 | 高砂熱学工業 株式会社 | Optimal control method for cogeneration system |
DE3933284A1 (en) * | 1989-10-05 | 1991-04-18 | Steinmueller Gmbh L & C | Electrical energy from solar energy - via methane deforming process and fuel cell |
US5074114A (en) * | 1990-05-14 | 1991-12-24 | Stirling Thermal Motors, Inc. | Congeneration system with a stirling engine |
US5159562A (en) * | 1990-07-31 | 1992-10-27 | Westinghouse Electric Corp. | Optimization of a plurality of multiple-fuel fired boilers using iterated linear programming |
JPH0565807A (en) * | 1991-08-23 | 1993-03-19 | Toshiba Corp | Control device for cogeneration system |
-
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- 1993-03-29 US US08/038,481 patent/US5432710A/en not_active Expired - Lifetime
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- 1993-04-06 DE DE69316260T patent/DE69316260T2/en not_active Expired - Fee Related
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