US20060185242A1 - Hydrogen gas generator - Google Patents
Hydrogen gas generator Download PDFInfo
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- US20060185242A1 US20060185242A1 US10/550,723 US55072305A US2006185242A1 US 20060185242 A1 US20060185242 A1 US 20060185242A1 US 55072305 A US55072305 A US 55072305A US 2006185242 A1 US2006185242 A1 US 2006185242A1
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- Prior art keywords
- hydrogen gas
- catalyst
- fuel tank
- fuel
- hydrogen
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C11/00—Use of gas-solvents or gas-sorbents in vessels
- F17C11/005—Use of gas-solvents or gas-sorbents in vessels for hydrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J14/00—Chemical processes in general for reacting liquids with liquids; Apparatus specially adapted therefor
- B01J14/005—Chemical processes in general for reacting liquids with liquids; Apparatus specially adapted therefor in the presence of catalytically active bodies, e.g. porous plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J7/00—Apparatus for generating gases
- B01J7/02—Apparatus for generating gases by wet methods
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
- C01B3/065—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents from a hydride
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
- H01M8/04208—Cartridges, cryogenic media or cryogenic reservoirs
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
- H01M8/04216—Reactant storage and supply, e.g. means for feeding, pipes characterised by the choice for a specific material, e.g. carbon, hydride, absorbent
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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
- H01M8/06—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
- H01M8/065—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by dissolution of metals or alloys; by dehydriding metallic substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00162—Controlling or regulating processes controlling the pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00164—Controlling or regulating processes controlling the flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00245—Avoiding undesirable reactions or side-effects
- B01J2219/0027—Pressure relief
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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
- 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
- Y02E60/32—Hydrogen storage
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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
- 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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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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
- 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
Disclosed is a self-regulating hydrogen gas generator for a hydrogen fuel cell. The self-regulating hydrogen gas generator includes a fuel tank, defining an inner space having a designated volume, provided with a hydrogen outlet communicating the inner space, a fuel solution, containing a hydrogen storing material, stored in the fuel tank, and a catalyst contacting the fuel solution for generating hydrogen gas, wherein the catalyst fills a catalytic reactor, provided with a closed portion for interrupting the contact between the catalyst and the fuel solution, and an opened portion contacting the fuel solution, so that the generation and interruption of hydrogen gas are actively regulated based on the increase and decrease of the pressure of the fuel tank.
Description
- The present invention relates to a self-regulating hydrogen gas generator, and more particularly to a hydrogen gas generator for actively regulating the generation of hydrogen gas due to variation in pressure of a fuel tank based on the amount of hydrogen gas generated in the fuel tank regardless of any external force.
- Recently, industrial development has improved quality of life, but the rapid increase of energy demand causes serious problems such as environmental pollution and exhaustion of fossil fuels.
- All the countries of the world put forth great effort into the development of alternative energy sources to protect against possible exhaustion of fossil fuels, including petroleum. Particularly, the conventional use of fossil fuels causes serious environmental (air) pollution, thereby accelerating global warming and the destruction of environment. It is known that the main factors contaminating the atmosphere are nitric oxides, hydrocarbons and carbon dioxide exhausted from factories or vehicles. These exhaust gases destroy the ozone layer, thereby causing various natural hazards, such as the direct transmission of harmful rays of the sun to the surface of the earth and the generation of climatic change, the destruction of the ecosystem, and various diseases.
- In order to reduce the air pollution generated due to the use of fossil fuels, development of clean-burning fuels has been accelerated. Particularly, the development of alternative clean energy using hydrogen as an energy source is suggested. Hydrogen, which an abundant earth resource, reacts with oxygen to generate a great deal of energy and only water as a by-product, thus being the only measure for simultaneously solving the problems of the exhaustion of energy resources and environmental pollution.
- However, in order to use hydrogen as an energy resource, technical problems caused by the generation of hydrogen and the safe storage and carriage of the generated hydrogen must be solved. Particularly, in case that hydrogen is used as the fuel for mobile equipment such as a hydrogen engine or hydrogen fuel cell applied to a vehicle, or a hydrogen fuel cell applied to small-sized IT (Information Technology) electronic devices, since the amount of fuel stored in the equipment is restricted, a technique of minimizing the volume and weight of a fuel tank for maintaining a high energy density is essentially required.
- Particularly, in case that hydrogen is used as fuel of the hydrogen fuel cell for vehicles and IT electronic devices, the performances of the vehicles and IT electronic devices are influenced by the storage method of the fuel and the capacity of the fuel tank. Thus, the generation and storage methods of hydrogen are considered as leading techniques. A liquid hydrogen storage method, a gaseous hydrogen storage method and a solid hydrogen storage method are used as the hydrogen storage methods, which are suggested now.
- The liquid hydrogen storage method is advantageous in that hydrogen is liquefied by maintaining cryotemperatures to greatly increase the stored density of hydrogen. However, natural loss of the liquefied hydrogen must be reduced and energy loss due to the cryogenic cooling must be considered.
- In the gaseous hydrogen storage method, high pressure is applied to hydrogen and the compressed hydrogen is then stored. In order to obtain an energy density suitable for mobile equipment, several hundreds of atmospheres must be applied to the hydrogen, thus increasing energy consumption and requiring a safe storage method for the super high-pressure hydrogen.
- The solid hydrogen storage method is advantageous in that it is usable at room-temperature and low-pressure and is excellent in terms of safety and reduces energy loss, but is disadvantageous in that it has a low energy density per unit weight due to the high density of a hydrogen storing material. For example, a hydrogen fuel cell vehicles, which command public attention recently, use hydrogen instead of gasoline or light gas oil as fuel. In order to use hydrogen as the fuel of the hydrogen fuel cell vehicle, a large amount of hydrogen must be stored in a storage container. In case that the conventional solid hydrogen storage method is applied to the above hydrogen fuel cell vehicle, the hydrogen fuel cell vehicle has a travel range half of that of a vehicle using gasoline as its fuel source, thus causing a difficulty in commercially using the conventional solid hydrogen storage method. In accordance with one solid hydrogen storage method for solving of the above problem, a catalyst contacts a fuel solution obtained by dissolving a hydrogen storing material, thus generating hydrogen. Since it is possible to store hydrogen in a liquid state at approximately atmospheric pressure, this method has high stability and high hydrogen storing capacity, thus being capable of being applied to mobile equipment.
- The above method generates hydrogen by means of the reaction between the fuel solution and the catalyst. Accordingly, in order to start or stop the generation of hydrogen, the method requires a process for bringing the catalyst into contact with the fuel solution or separating the catalyst from the fuel solution by supplying the fuel solution to the catalyst or preventing the supply of the fuel solution using a pump, or by moving the catalyst to the fuel solution or separating the catalyst from the fuel solution using a motor. Particularly, in case that the above method is used in mobile equipment provided with a hydrogen fuel cell, when an amount of hydrogen exceeding the requirements of the mobile equipment is generated, hydrogen is accumulated in the hydrogen fuel cell and increases the pressure in the system. In this case, in order to maintain the pressure in the system below a designated value, apparatuses, for exhausting the accumulated hydrogen, measuring the pressure and the supplied amount of hydrogen using a sensor, regulating the reacting amount of the catalyst by separating the catalyst from the fuel solution using external mechanical energy, and/or variably regulating the supplied amount of the fuel solution containing the hydrogen storing material, are additionally installed in the system, thereby complicating the structure of the system and increasing the volume of the system. Thus, the use of the system is restricted.
- In order to solve the above-described problems and since an embodiment for increasing a contact area between a fuel solution and a catalyst attached to a catalyst-fixing portion is insufficient, the development of various embodiments is required. Further, technical solution and means, for preventing moisture contained in hydrogen gas in a foam state from closing fine air holes of a gas-liquid separating film, when the hydrogen gas containing fine moisture particles generated in the fuel tank collides with the gas-liquid separating film, are required. Further, technical means, for preventing moisture contained in hydrogen gas in the foam state from closing fine air holes of the gas-liquid separating film, in case that hydrogen gas flowing out of the fuel solution, which contains fine moisture particles, collides with the gas-liquid separating film, and improving performance of an apparatus, is required.
- Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a self-regulating hydrogen gas generator, which is actively self-operated at an initial stage without an external energy source, and generates and supplies hydrogen gas serving as an energy source, thereby allowing the hydrogen gas to be used as clean alternative energy, preventing environmental pollution and increasing the utility of the hydrogen gas.
- It is another object of the present invention to provide a self-regulating hydrogen gas generator, which has a simple structure and a minimal volume, thereby commercially applying hydrogen gas to apparatuses, systems and mobile equipment using hydrogen as fuel.
- It is yet another object of the present invention to provide a self-regulating hydrogen gas generator, in which a catalyst-fixing member, provided with a catalyst attached thereto, contacting a fuel solution to generate hydrogen gas has various shapes for generating a large amount of hydrogen gas, and a fixed fuel tank, mobile and portable equipment has a structure such that hydrogen gas generated in the fuel tank is efficiently exhausted and passes through a gas-liquid separating film, thus having an improved performance.
- In accordance with the present invention, the above and other objects can be accomplished by the provision of a self-regulating hydrogen gas generator, for a hydrogen fuel cell, comprising: a fuel tank, defining an inner space having a designated volume, provided with a hydrogen outlet communicating the inner space; a fuel solution, containing a hydrogen storing material, stored in the fuel tank; and a catalyst contacting the fuel solution for generating hydrogen gas, wherein the catalyst fills a catalytic reactor, provided with a closed portion for interrupting the contact between the catalyst and the fuel solution to stop the generation of hydrogen gas in case that a pressure of the fuel tank increases due to the generation of hydrogen gas by the contact between the catalyst and the fuel solution, and an opened portion contacting the fuel solution for generating hydrogen gas in case that the pressure of the fuel tank decreases due to the use of the generated hydrogen gas by the fuel cell, so that the generation and interruption of hydrogen gas are actively regulated based on the increase and decrease of the pressure of the fuel tank.
- Preferably, the catalytic reactor may include elastic means having a designated compressing and restoring force for moving the catalyst toward the closed or opened portion, based on the increase and decrease of the pressure of the fuel tank due to the generation of hydrogen gas, to regulate the generation of hydrogen gas, and the catalyst may be combined with a catalyst-fixing member, which is movable in the catalytic reactor.
- Further, preferably, the fuel tank may include gas-liquid separating means for separating the generated hydrogen gas from the fuel solution in a liquid state and exhausting the separated hydrogen gas to the outside. More preferably, the gas-liquid separating means may be a gas-liquid separating film having various shapes fixedly installed in the fuel tank so that a designated space between the inner hole of the outlet and the fuel solution is defined to easily exhaust the hydrogen gas through the outlet.
- Preferably, the gas-liquid separating means may include a collector floating on the fuel solution filling a designated level of the fuel tank, a collection hole protruded from the collector and exposed to the upper surface of the fuel solution for introducing the hydrogen gas generated in the fuel tank to the collector therethrough, and a drain hose connecting the other side of the collector, opposite to the collection hole, and the outlet, for exhausting the hydrogen gas collected by the collector. Further, preferably, the fuel tank may include hydrogen gas retaining means for converting hydrogen gas in a fine foam state, generated by the contact of the fuel solution and the catalyst, into large-sized hydrogen gas bubbles and allowing the obtained large-sized gas bubbles to pass through the gas-liquid separating means. Moreover, preferably, at least one collision member for preventing hydrogen gas in a fine foam state, generated in the fuel tank, containing moisture, from directly contacting the gas-liquid separating film, may be interposed between the fuel solution and the gas-liquid separating film.
- The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
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FIG. 1 is a partially exploded perspective view of a hydrogen gas generator in accordance with a first embodiment of the present invention; -
FIGS. 2 and 3 are partially exploded perspective views illustrating the operation of a catalytic reactor applied to the hydrogen gas generator in accordance with the first embodiment of the present invention; -
FIG. 4 is an exploded perspective view of the catalytic reactor ofFIGS. 2 and 3 ; -
FIGS. 5 and 6 are partially exploded perspective views of another catalytic reactor having a shape differing from that of the catalytic reactor ofFIGS. 2 and 3 ; - FIGS. 7 to 13 illustrate various embodiments of a catalyst-fixing member, to which a catalyst is connected;
- FIGS. 14 to 18 illustrate various embodiments of gas-liquid separating means provided in a fuel tank;
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FIGS. 19 and 20 illustrate hydrogen gas retaining means formed on the external surface of the catalytic reactor filled with a fuel solution; -
FIGS. 21 and 22 illustrate a collision member interposed between the fuel solution of the fuel tank and a gas-liquid separating film; - FIGS. 23 to 28 are each schematic views of hydrogen gas generators in accordance with second, third and fourth embodiments of the present invention; and
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FIG. 29 is a schematic view of the hydrogen gas generator of the present invention used as a fuel feed system of a portable telephone. - Now, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings. Hereinafter, the description of conventional peripheral devices of a hydrogen gas generator will be omitted.
- A hydrogen gas generator (H) of the present invention is characterized in that the generation of hydrogen gas and the interception of the hydrogen gas are repeatedly performed without using external energy.
- More specifically, the hydrogen gas generator (H) of the present invention comprises a
fuel tank 10 having a designated size for maintaining a hermetically sealed space, a hydrogen storingmaterial fuel solution 17 contained in thefuel tank 10, and acatalyst 21 contacting the hydrogen storingmaterial fuel solution 17 for generating hydrogen gas. Thecatalyst 21 fills acatalyst reactor 20 having a designated shape.FIG. 1 is a perspective view of the hydrogen gas generator, in which thefuel tank 10 is partially exploded in accordance with a first embodiment of the present invention. - As shown in
FIG. 1 , thefuel tank 10 has the designated size for containing the fuel solution having a certain volume, and the size and shape of thefuel tank 10 vary according to the purpose and kind of thefuel tank 10. Anoutlet 12 for discharging hydrogen generated in thefuel tank 10 is formed in one side surface of thefuel tank 10, and a valve, such as aquick connector 15, is installed on theoutlet 12 and is combined with a hydrogen fuel cell. - The fuel tank is filled with the hydrogen storing
material fuel solution 17 having a certain volume, when thefuel tank 10 is initially manufactured, and is then hermetically sealed so that the fuel tank cannot be recharged and discharged. Alternately, ahole 14 is formed through one side of thefuel tank 10 so that thefuel solution 17, after use, is discharged from thefuel tank 10 through thehole 14 andnew fuel solution 17 fills thefuel tank 10 through thehole 14, and avent hole 13 serving as a safety measure is formed through one side of thefuel tank 10 so that hydrogen is discharged from the inside of thefuel tank 10 to the outside. - The hydrogen storing
material fuel solution 17 applied to the embodiment of the present invention containsNaBH 4 20%, KOH 8% and H2O 72%. Thecatalyst 21 is made of a material, which efficiently generates hydrogen by contact with thefuel solution 17. In the present invention, thecatalyst 21 is made of Raney Ni. -
FIGS. 2 and 3 are partially exploded perspective views illustrating the operation of thecatalytic reactor 20 applied to the hydrogen gas generator (H) in accordance with the first embodiment of the present invention.FIG. 4 is an exploded perspective view of thecatalytic reactor 20 ofFIGS. 2 and 3 . - The
catalytic reactor 20 of the hydrogen gas generator (H) of the present invention has a structure such that the contact or isolation between thecatalyst 21 and thefuel solution 17 of thefuel tank 10 is automatically controlled by the pressure of hydrogen generated in thefuel tank 10. In this embodiment of the present invention, thecatalytic reactor 20 is positioned at the inside of thefuel tank 10 such that hydrogen is generated due to the contact between thefuel solution 17 and thecatalyst 21 under the condition that thecatalytic reactor 20 is dipped in thefuel solution 10. In other embodiments of the present invention, thecatalytic reactor 20 is positioned at the outside of thefuel tank 1, and will be described in brief later. - That is, as shown in
FIGS. 2 and 3 andFIG. 4 , it is preferable that thecatalytic reactor 20 is a tube including amain body 29 provided with an openedportion 28 positioned at one end thereof and communicated with the outside and aclosed portion 27 positioned at the other end thereof. The openedportion 28 is obtained by opening one end of themain body 29 or forming a cutting portion at the side surface of one end of themain body 29, and has a structure such that thecatalyst 21 is exposed to the outside through the openedportion 28 and contacts thefuel solution 17. - Further, elastic means 24 having an excellent restoring force is positioned at the inside of the
closed portion 27 formed at the end of themain body 29, and thecatalyst 21 is attached to a catalyst-fixingmember 22 reciprocating in theclosed portion 27. In case that the pressure in thefuel tank 10 increases, the catalyst-fixingmember 22 moves toward theclosed portion 27 so as to prevent thecatalyst 21 from contacting thefuel solution 17, and in case that the pressure in thefuel tank 10 decreases, the catalyst-fixingmember 22 moved toward theclosed portion 27 is returned to an initial position toward the openedportion 28 by the elastic means 24 so as to cause thecatalyst 21 to contact thefuel solution 17 through the openedportion 28 to generate hydrogen. - The
catalyst 21 is a powder or lump type. In case that thecatalyst 21 is a powder type, thepowdery catalyst 21 is introduced into a net made of various materials, which does not pass powder but passes thefuel solution 17 and the hydrogen gas, or is attached to the net or a substrate using an adhesive agent, and is then attached to the catalyst-fixingmember 22. Alternately, in this case, thepowdery catalyst 21 is processed to have a designated shape suitably for the structure of the catalyst-fixingmember 22, is sintered, and is then attached to the catalyst-fixingmember 22. - More specifically, Raney Ni used as the
catalyst 21 of the embodiment of the present invention has a large surface area, thus being stored in distilled water, and is characterized in that Raney Ni spontaneously combusts when exposed to air. Accordingly, in order to use Raney Ni as thecatalyst 21, only the surface of Raney Ni is oxidized so that Raney Ni is stably used in the atmosphere. This method reduces the hydrogen generating capacity of thecatalyst 21. Thus, in embodiments of the present invention, thecatalyst 21 is manufactured by two methods, in which the surface of Raney Ni is not oxidized. In the first method, Raney Ni is attached to a magnet, and is then used. That is, the magnet is attached to the catalyst-fixing member 22 (with reference toFIG. 12 ), and then Raney Ni is attached to the magnet attached to the catalyst-fixingmember 22. - In the second method, Raney Ni is attached to a net or substrate made of various materials in an aqueous solution such as distilled water. Since Raney Ni is stored in distilled water, when Raney Ni stored in the distilled water is manufactured into the
catalyst 21, it is possible to prevent the reduction of the hydrogen generating capacity of thecatalyst 21 due to the surface oxidation. In the embodiment of the present invention, thecatalyst 21 is manufactured by fixing Raney Ni to a nickel mesh using urethane foam. - As the higher the temperature is, the greater the hydrogen generating capacity of the
catalyst 21, including Raney Ni, is. In case that a worker wants to generate a large amount of hydrogen using a small amount of thecatalyst 21, a heating medium, such as a hot wire, for heating thecatalyst 21 or the fuel by itself or by an external power supply source is installed in at least one of thefuel tank 10, thecatalytic reactor 20 and the catalyst-fixingmember 22. The above method using the heating medium increases the solubility of the hydrogen storing material and its by-product, thus causing the hydrogen storing material and the by-product to store a large amount of hydrogen. - The catalyst-fixing
member 22 has a structure or shape for allowing thecatalyst 21 to be easily attached thereto and effectively preventing thefuel solution 17 from being introduced thereinto when thecatalyst 21 enters into and leaves the inside of themain body 29. The catalyst-fixingmember 22 of the embodiment of the present invention includes bothwings catalyst 21, interposed between thewings - When the catalyst-fixing
member 22 moves toward the inside and outside of theclosed portion 27 of themain body 29, in order to prevent thefuel solution 17 in a liquid state from being introduced into the closed portion along the outer surface of the catalyst-fixingmember 22, fuelsolution interception members member 22 and the inner surface of themain body 29 or between the catalyst-fixingmember 22 and theelastic means 24. Aninstallation groove 25 a is formed on the inner circumference of themain body 29, and asubsidiary interception member 25 having a ring shape is inserted into theinstallation groove 25 a so as to prevent the fuel solution from being introduced into themain body 29 along the external circumference of the catalyst-fixingmember 22 when the catalyst-fixingmember 22 provided with thecatalyst 21 attached thereto moves.FIG. 4 illustrates the above components of thecatalytic reactor 20. -
FIGS. 5 and 6 are partially exploded perspective views of anothercatalytic reactor 20 having a shape differing from that of the abovecatalytic reactor 20. Here, the openedportion 28 is formed at one end of themain body 29, thecatalyst 21 is attached to the catalyst fixing section 23 c such that thecatalyst 21 surrounds the overall external circumference of the catalyst fixing section 23 c to enlarge the contact area between thecatalyst 21 and the fuel solution, thereby increasing the amount of the generated hydrogen. Other elements of thecatalytic reactor 20 are the same as those of the above-described catalytic reactor. - Preferably, the elastic means 24 applied to this embodiment of the present invention is made of compressed gas and elastomer for restoring the catalyst-fixing
member 22 to an initial position when the catalyst-fixingmember 22 is forcibly introduced into the inside of theclosed portion 27 and hydrogen filling thefuel tank 10 is exhausted through theoutlet 12 using a hydrogen fuel cell so that the pressure in thefuel tank 10 decreases in case that the exposed state of thecatalyst 21 positioned on the catalyst-fixingmember 22 is maintained at the atmospheric pressure and the pressure in thefuel tank 10 increases to higher than the atmospheric pressure and the increased pressure is applied to one side surface of the catalyst-fixingmember 22 exposed to the openedportion 28 of thecatalytic reactor 20. In this embodiment of the present invention, the elastic means 24 is made of a compressed coil spring. - FIGS. 7 to 13 illustrate various embodiments of the catalyst-fixing
member 22. The various embodiments of the catalyst-fixingmember 22 serve to improve the structure of the catalyst-fixing section 23 c, to which thecatalyst 21 is attached, so as to maximally increase the contact area between thecatalyst 21 and thefuel solution 17. - That is, the catalyst-fixing
member 22 applied to the embodiment of the present invention includes thewings main body 29 and the catalyst-fixing section 23 c, having various shapes for receiving thecatalyst 21, interposed between thewings catalyst 21 is attached to the surface of the catalyst-fixing section 23 c. Amagnet 23 d may be attached to one side surface or both side surfaces of the catalyst-fixing section 23 c so that themetallic catalyst 21 can be attached to the catalyst-fixing section 23 c without any separate process (with reference toFIG. 12 ). - Hereinafter, a process for generating hydrogen by the hydrogen gas generator (H) of the present invention will be described in detail. The
fuel solution 17 in an amount of 10 ml is introduced into thefuel tank 10, and thecatalyst 17 in an amount of 0.1 g made of Raney Ni is introduced into thefuel tank 10. Then, thefuel tank 10 generates hydrogen gas at the rate, corresponding to 12SCCM (Standard Cubic Centimeter per Minute) at room temperature or 1W of the fuel cell, for approximately 10 hours. The hydrogen gas generated in thefuel tank 10 is supplied to an external system, such as a hydrogen engine, using hydrogen as a fuel, or a hydrogen fuel cell, through theoutlet 12 of thefuel tank 10. In case that the amount of the hydrogen gas required by the external system is less than 12SCCM, or the hydrogen gas is not exhausted by cutting off the power, the generated hydrogen gas is accumulated in thefuel tank 10 and the pressure in thefuel tank 10 increases to 1.5 atmospheres (P1). - There is generated a difference of pressures between the
fuel tank 10 and themain body 29 of thecatalytic reactor 20, and the increased pressure in thefuel tank 10 presses one end of the openedportion 28 of themain body 29 of thecatalytic reactor 20. When the catalyst-fixingmember 22 moves toward theclosed portion 27 of themain body 29 of thecatalytic reactor 20, thecatalyst 21 exposed to thefuel solution 17 made of the hydrogen storing material gradually enters into themain body 29 so that the contact area between thecatalyst 21 and thefuel solution 17 is reduced, thereby reducing the generation of hydrogen gas and then stopping the generation of hydrogen gas. - When the external system again uses hydrogen gas, the generated hydrogen gas is exhausted from the
fuel tank 10. Then, the pressure in thefuel tank 10 is reduced, the difference of pressures between thefuel tank 10 and themain body 29 of thecatalytic reactor 20 decreases, and the elastic means 24 positioned in themain body 29 is returned to the initial position so that the catalyst-fixingmember 22 moves toward the openedportion 28 and thecatalyst 21 again contacts thefuel solution 17. Thereby, the hydrogen gas generator (H) of the present invention intermittently generates hydrogen gas. - FIGS. 14 to 18 illustrate various embodiments of gas-liquid separating means 40 provided in the
fuel tank 10. - The gas-liquid separating means 40 serves to prevent the hydrogen in a gas state generated in the
fuel tank 10 filled with the water-soluble fuel solution 17 from being exhausted together with the exhaustion of the fuel solution in a liquid state, and is more usable in a mobile or portable fuel cell rather than a fixed fuel cell. - That is, each of the gas-liquid separating means 40 shown in FIGS. 14 to 16 includes a gas-
liquid separating film 42. The gas-liquid separating film 42 is made of hydrophobic silicon rubber, which is more permeable to hydrogen gas than water, a porous non-metal such as Teflon, or metal having selective permeability to hydrogen. InFIG. 14 , the gas-liquid separating film 42 installed in thefuel tank 10 is separated from the inner hole of theoutlet 12 by a designated interval. Animplant member 43 provided with air holes or hydrogen paths, for preventing the movement of the gas-liquid separating film 42 and efficiently exhausting hydrogen when the pressure in thefuel tank 10 increases due to the generation of the hydrogen gas or thefuel tank 10 moves, is interposed between the inner surface of thefuel tank 10, where theoutlet 12 is positioned, and the gas-liquid separating film 42. The gas-liquid separating film 42 may have other structures without theimplant member 43 so that the gas-liquid separating film 42 is fixed to the inner surface of thefuel tank 10 and the generated hydrogen gas is efficiently exhausted. - In
FIG. 15 , the hermetically sealed type gas-liquid separating film 42, which is positioned in thefuel tank 10, has the same shape as that of thefuel tank 10 and a size slightly smaller than that of thefuel tank 10, and is separated from the inner wall of thefuel tank 10. Also, theimplant member 43, for preventing the contact of the inner wall of thefuel tank 10 and the gas-liquid separating film 42 due to the increased pressure or movement of thefuel tank 10 and allowing the hydrogen gas to smoothly move, is interposed between the inner wall of thefuel tank 10 and the gas-liquid separating film 42. InFIG. 16 , the gas-liquid separating film 42 is U-shaped, and is positioned in thefuel tank 10 such that the central area of the gas-liquid separating film 42 is disposed under the inner hole of theoutlet 12. - In
FIGS. 17 and 18 , the gas-liquid separating means 40 includes acollector 44, made of a material floating on thefuel solution 17 in the liquid state, for collecting generated gas and then exhausting the gas to the outside. Acollection hole 46 for introducing the hydrogen gas from thefuel tank 10 thereinto is protruded from one side of the collector 40, and adrain hose 48 for exhausting the hydrogen gas collected by thecollector 44 to theoutlet 12 connects the other side of the collector 40 opposite to thecollection hole 46 and theoutlet 12. - The above-described various structures of gas-liquid separating means 40 may be properly selected based on characteristics of equipment using hydrogen fuel, and the
collector 44 may be made of any material having specific gravity lower than that of water. -
FIGS. 19 and 20 illustrate hydrogen gas retaining means 50 for temporarily collecting the hydrogen gas generated in thecatalytic reactor 20 filled with thefuel solution 17 in thefuel tank 10 and for converting small-sized hydrogen bubbles in a fine foam state into large-sized hydrogen bubbles. The hydrogen gas retaining means 50 has various structures for indirectly cutting off the circumference of thecatalytic reactor 20, thus allowing the hydrogen bubbles in the fine foam state to be temporarily aggregated and then exhausted to the outside. - When the
fuel solution 17 filling thefuel tank 10 contacts thecatalyst 21 of thecatalytic reactor 20 to exhaust the fine hydrogen foam, the hydrogen gas retaining means 50 serves to collect the fine hydrogen foam and convert the foam into large-sized hydrogen bubbles and then to allow the large-sized hydrogen bubbles to pass through the gas-liquid separating film 42. In case that the small-sized hydrogen bubbles in the fine foam state directly reach the gas-liquid separating film 42, the small-sized hydrogen bubbles in the fine foam state close fine air holes of the gas-liquid, thus causing a difficulty of efficiently exhausting the hydrogen gas. Accordingly, the hydrogen gas retaining means 50 prevents the above problem. - Particularly, the hydrogen gas generator (H) of the present invention can be applied to fixed, mobile or portable articles using a hydrogen fuel cell. Even though the
fuel tank 10 is disposed at any position of the article, the hydrogen gas generated in thefuel tank 10 must be efficiently exhausted. Thus, the gas-liquid separating film 42 can be installed at any portion, i.e., left, right, upper and lower portions, of the inside of thefuel tank 10. In the embodiments of the present invention shown inFIGS. 19 and 20 , the gas-liquid separating means 42 are respectively installed at the upper and lower portions of the inside of thefuel tank 10, and aconnection pipe 54 connects both spaces obtained by the upper and lower gas-liquid separating means 42. Although thefuel tank 10 stands at any position, spaces cut off from the fuel solution by the gas-liquid separating films 42 are connected to each other through theconnection pipe 54 so that the hydrogen gas bubbles generated in thefuel tank 10 communicate between the spaces, thereby efficiently exhausting the hydrogen gas bubbles to the outside through theoutlet 12. The hydrogen gas retaining means 50 is formed integrally with thefuel tank 10, or thecatalytic reactor 20 is formed integrally with the hydrogen gas retaining means 50. -
FIGS. 21 and 22 respectively illustrate embodiments, in which acollision member 52 is interposed between thefuel solution 17 of thefuel tank 10 and the gas-liquid separating film 42. That is, thecollision member 52 serves to prevent the fine hydrogen foam, generated in thefuel tank 10, containing moisture, from directly contacting the gas-liquid separating film 42. When the hydrogen gas rises and collides with thecollision member 52, the moisture contained by the hydrogen gas due to thefuel solution 17 is separated from the hydrogen gas. Thereby, only the obtained pure hydrogen gas passes through the gas-liquid separating film 42. In the same manner as the above-described hydrogen gas retaining means 50, thecollision member 52 may have various structures based on installation types of thefuel tank 10 or applied articles. - FIGS. 23 to 28 are each schematic views of hydrogen gas generators in accordance with second, third and fourth embodiments of the present invention. In these embodiments of the present invention, the hydrogen gas generator is a fuel tank external installation type, in which the
catalytic reactor 20 is detachably attached to the outer surface of thefuel tank 10. - That is, the
catalytic reactor 20 provided with the elastic means 24 and the catalyst-fixingmember 22 positioned therein is inserted into aninstallation groove 60 formed in one outer surface of thefuel tank 10. - More specifically, in the second embodiment shown in
FIGS. 23 and 24 , astopper 60 a is protruded from one end of thecatalytic reactor 20, and a stopper-fixture 60 b for fixing thestopper 60 a is formed in the front end of the inside of theinstallation groove 60. A throughhole 62 communicating with the inside of thefuel tank 10 is formed at a designated position of the inner circumference of theinstallation groove 60, the elastic means 24 is positioned on the bottom of theinstallation groove 60 inside the throughhole 62, a throughhole sealing member 26 for sealing the throughhole 62 is combined with the elastic means 24, a hydrogengeneration regulating hole 64 communicating with the inside of thefuel tank 10 for introducing a fluid of thefuel tank 10 is formed through the bottom of theinstallation groove 60, and the gas-liquid separating film 42 is installed in front of the hydrogengeneration regulating hole 64 in thefuel tank 10. - As shown in
FIG. 23 , before thecatalytic reactor 20 is inserted into theinstallation groove 60 of thefuel tank 10, the throughhole sealing member 26 positioned in theinstallation groove 60 seals the throughhole 62. Then, as shown inFIG. 24 , when thecatalytic reactor 20 is inserted into theinstallation groove 60 of thefuel tank 10, the throughhole sealing member 26 presses the elastic means 24 so that the throughhole 62 is exposed to the outer circumference of thecatalytic reactor 20, and when thecatalytic reactor 20 is fully inserted into theinstallation groove 60 of thefuel tank 10, the throughhole 62 contacts thecatalyst 21 provided on thecatalytic reactor 20, thereby allowing hydrogen gas to be generated. - When the inner pressure of the
fuel tank 10 rises due to the generation of hydrogen gas and exceeds a designated level (in case that the hydrogen gas is not used), a part of the hydrogen gas accumulated in thefuel tank 10 is introduced into theinstallation groove 60 through the hydrogengeneration regulating hole 64 formed through the bottom of theinstallation groove 60, and the inner pressure of theinstallation groove 60 rises. Then, the throughhole sealing member 26 pushes the catalyst-fixingmember 22 of thecatalytic reactor 20, and releases its force from theelastic means 24. As the elastic means 24 is stretched, the contact area between thecatalyst 21 and thefuel solution 17 gradually decreases and the throughhole 62 is fully sealed by the throughhole sealing member 26, thereby stopping the generation of hydrogen gas. When the external system uses the generated hydrogen gas, the pressure of hydrogen in thefuel tank 10 is decreased and the fluid in theinstallation groove 60 is directed into thefuel tank 10. Then, the elastic means 24 positioned on thecatalytic reactor 20 is constricted and the catalyst-fixingmember 22 pushes the throughhole sealing member 26 so that thecatalyst 21 contacts thefuel solution 17. By automatically achieving the generation of the hydrogen gas and the interruption of the hydrogen gas by means of repeating the above-described operation, the hydrogen gas generator (H) of the present invention generates and supplies hydrogen gas required by a hydrogen fuel cell, etc. The hydrogengeneration regulating hole 64 can be disposed at any position, which allows the fluid of thefuel tank 10 to be introduced into the installation groove due to the increased inner pressure of thefuel tank 10 to push the throughhole sealing member 26 or the catalyst-fixingmember 22 of thecatalytic reactor 20. - In the third embodiment shown in
FIGS. 25 and 26 , a catalyst exposure regulating portion 66 having a sealed space is extended from the end of the above-describedcatalytic reactor 20, i.e., the outer surface of the catalyst-fixingmember 22. A hydrogengeneration regulating hole 64′, which coincides with the hydrogengeneration regulating hole 64 when thecatalytic reactor 20 is inserted into theinstallation groove 60 and regulates the generation of hydrogen gas by moving the catalyst-fixingmember 22 based on the increase and decrease of the inner pressure of thefuel tank 10, is formed through a designated position of the catalyst exposure regulating portion 66. - The hydrogen gas generator (H) of the third embodiment is the same as the hydrogen gas generator (H) of the second embodiment in that the generation of the hydrogen gas and the interruption of the hydrogen gas are achieved by the increase and decrease of the inner pressure of the
fuel tank 10. However, in the third embodiment, when the inner pressure of thefuel tank 10 increases, the fluid in a high pressure state is introduced into the catalyst exposure regulating portion 66 formed at the inner front end of thecatalytic reactor 20, and pushes the catalyst-fixingmember 22 of thecatalytic reactor 20. On the other hand, when the inner pressure of thefuel tank 10 decreases, the fluid having introduced into the catalyst exposure regulating portion 66 is exhausted, and pushes the catalyst-fixingmember 22 by means of the elastic means 24 positioned in thecatalytic reactor 20 so that thecatalyst 21 contacts thefuel solution 17, thereby allowing hydrogen gas to be generated. - In the fourth embodiment shown in
FIGS. 27 and 28 , elastic means is not provided in thecatalytic reactor 20 combined with theinstallation groove 60, and the catalyst-fixingmember 22 is provided only on the front end of themain body 29 of the catalyst-fixingmember 22. Astopper 61 a, serving as fixing means, is popped into and out of the outer surface of themain body 29 by anelastic spring 67 positioned in aninstallation hole 65 formed in the central area of themain body 29, and a stopper-fixture 61 b for fixing thestopper 61 a to prevent thecatalytic reactor 20 from being separated from theinstallation groove 60 after thecatalytic reactor 20 is inserted into theinstallation groove 60. - As shown in
FIG. 28 , when thecatalytic reactor 20 is forcibly inserted into theinstallation groove 60, thestopper 61 a formed on the outer circumference of thecatalytic reactor 20 is caught by the stopper-fixture 61 b so that thecatalytic reactor 20 is fixed into theinstallation groove 60. - As described above, the
catalyst 21 of thecatalytic reactor 20 combined with thefuel tank 10 contacts thefuel solution 17 filling thefuel tank 10, thus generating hydrogen gas. When the inner pressure of thefuel tank 10 increases more than a designated value, the fluid at an increased pressure of thefuel tank 10 is introduced into theinstallation groove 60 through the hydrogengeneration regulating hole 64 formed through the bottom of theinstallation groove 60 and pushes the throughhole sealing member 26. Then, the throughhole sealing member 26 applies pressure to thecatalytic reactor 20 contacting the throughhole sealing member 26, and thestopper 61 a formed on the outer circumference of thecatalytic reactor 20 is popped into theinstallation hole 65 by pressing theelastic spring 67 provided in theinstallation hole 65, and is then separated from the stopper-fixture 61 b. Thereby, the hydrogen gas generator (H) in accordance with this embodiment of the present invention generates hydrogen gas by a user forcibly inserting thecatalytic reactor 20 into theinstallation groove 60. - As shown in
FIG. 29 , the hydrogen gas generator (H) of the present invention may be used in a hydrogen fuel cell of a portable telephone (P). - As described above, the hydrogen gas generator (H) of the present invention actively self-regulates the generation and interruption of hydrogen gas based on the pressure of the generated hydrogen gas without any external force, thus having a simple structure and reducing production costs. Further, the hydrogen gas generator (H) of the present invention has reduced volume and weight, thereby greatly increasing energy density per volume and weight of a fuel cell serving as an energy source for various equipment.
- After all hydrogen gas is exhausted from the
fuel solution 17, in the same manner as a conventional fuel cell, the hydrogen gas generator (H) of the present invention exhausts thewaste fuel solution 17 through thehole 14 formed through thefuel tank 10 and is then refilled with anew fuel solution 17. In case that the hydrogen gas generator (H) is combined with the fuel cell through thequick connector 15 positioned on theoutlet 12 of the fuel tank, thequick connector 15 is opened to supply the hydrogen gas to the fuel cell, and in case that the hydrogen gas generator (H) is separated from the fuel cell, thequick connector 15 is closed to prevent the hydrogen gas from being exhausted to the outside so that the pressure of thefuel tank 10 slightly increases and the reaction between thecatalyst 21 and thefuel solution 17 is prevented, thereby stably storing the hydrogen gas below a designated pressure. - The hydrogen gas generator (H) maximally increases a contact area between the
catalyst 21 and thefuel solution 17 by employing the various embodiments of the catalyst-fixingmember 22, thereby generating a great amount of hydrogen gas and enlarging the usable range of the hydrogen fuel cell. Further, the hydrogen gas generator (H) comprises the hydrogen gas retaining means 50 having various structures, and thecollision member 52 having various structures interposed between thefuel solution 17 and the gas-liquid separating film 42, so that the hydrogen gas generated in thefuel tank 10 is efficiently supplied to the outside, thereby improving the performance of the hydrogen fuel cell. In case that the gas-liquid separating films 42 are additionally installed in thefuel tank 10, the hydrogen g as is smoothly circulated through theconnection pipe 54. Thus, various structures of thefuel tank 10 are applied to the hydrogen fuel cell based on applied products, and extend the usable range of the hydrogen fuel cell, thereby being capable of effectively using energy. - As apparent from the above description, the present invention provides a self-regulating hydrogen gas generator, which is miniaturized, reduces production cost, volume and weight thereof, thus improving energy density per unit volume and weight and being applied to mobile or portable equipment using hydrogen as fuel as well as a large-sized hydrogen fuel cell device using hydrogen as fuel. Accordingly, the self-regulating hydrogen gas generator stimulates the use of hydrogen gas as clean alternative energy, and causes the hydrogen gas to be used as a substitute for gradually exhausted fossil fuels, thereby preventing air pollution and providing a clean environment.
- Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (26)
1. A self-regulating hydrogen gas generator, for a hydrogen fuel cell, comprising:
a fuel tank, defining an inner space having a designated volume, provided with a hydrogen outlet communicating the inner space;
a fuel solution, containing a hydrogen storing material, stored in the fuel tank; and
a catalyst contacting the fuel solution for generating hydrogen gas, wherein the catalyst fills a catalytic reactor, provided with a closed portion for interrupting the contact between the catalyst and the fuel solution to stop the generation of hydrogen gas in case that a pressure of the fuel tank increases due to the generation of hydrogen gas by the contact between the catalyst and the fuel solution, and an opened portion contacting the fuel solution for generating hydrogen gas in case that the pressure of the fuel tank decreases due to the use of the generated hydrogen gas by the fuel cell, so that the generation and interruption of hydrogen gas are actively regulated based on the increase and decrease of the pressure of the fuel tank.
2. The self-regulating hydrogen gas generator as set forth in claim 1 , wherein the catalytic reactor includes elastic means having a designated compressing and restoring force for moving the catalyst toward the closed or opened portion, based on the increase and decrease of the pressure of the fuel tank due to the generation of hydrogen gas, to regulate the generation of hydrogen gas.
3. The self-regulating hydrogen gas generator as set forth in claim 2 , wherein a catalyst-fixing member, provided with the catalyst connected thereto, which is movable in the catalytic reactor, is connected to one end of the elastic means.
4. The self-regulating hydrogen gas generator as set forth in claim 3 , wherein fuel solution interception members, for preventing the fuel solution from being introduced into the catalytic reactor through the opened portion when the catalyst-fixing member moves toward the closed portion due to the increase of the pressure of the fuel tank, are positioned at either of inner circumferences of the catalyst-fixing member and the catalytic reactor.
5. The self-regulating hydrogen gas generator as set forth in claim 3 , wherein fuel solution interception members, for preventing the fuel solution from being introduced into the catalytic reactor through the opened portion when the catalyst-fixing member moves toward the closed portion due to the increase of the pressure of the fuel tank, are positioned between the catalyst-fixing member and the elastic means.
6. The self-regulating hydrogen gas generator as set forth in claim 3 , wherein the fuel tank includes gas-liquid separating means for separating the generated hydrogen gas from the fuel solution in a liquid state and exhausting the separated hydrogen gas to the outside.
7. The self-regulating hydrogen gas generator as set forth in claim 6 , wherein:
an installation groove, into which the catalytic reactor from the outside is detachably inserted, is formed at a designated position of the fuel tank; and
the installation groove includes:
a through hole for allowing the catalyst of the catalytic reactor to contact the fuel solution of the fuel tank to generate hydrogen gas;
elastic means positioned on the bottom of the installation groove; a through hole sealing member combined with the elastic means for sealing the through hole and pushing the catalyst-fixing member of the catalytic reactor connected thereto due to the increase of the pressure of the fuel tank to the through hole when the catalytic reactor is separated from the installation groove; and a hydrogen generation regulating hole formed through the bottom of the installation groove defining a closed space by the through hole sealing member for allowing the hydrogen gas generated in the fuel tank to enter into and leave the installation groove.
8. The self-regulating hydrogen gas generator as set forth in claim 7 , wherein a gas-liquid separating film is installed in the fuel tank provided with the hydrogen generation regulating hole, and fixing means for fixing the catalytic reactor to the fuel tank is positioned at the end of the catalytic reactor and the entrance of the installation groove.
9. The self-regulating hydrogen gas generator as set forth in claim 8 , wherein a catalyst exposure regulating portion for defining a sealed space is extended from the end of the catalytic reactor at the outer surface of the catalyst-fixing member, and another hydrogen generation regulating hole, which coincides with the hydrogen generation regulating hole when the catalytic reactor is inserted into the installation groove and regulates the generation of hydrogen gas by moving the catalyst-fixing member based on the increase and decrease of the pressure of the fuel tank, is formed through a designated position of the catalyst exposure regulating portion.
10. The self-regulating hydrogen gas generator as set forth in claim 9 , wherein the gas-liquid separating means is a gas-liquid separating film having various shapes fixedly installed in the fuel tank so that a designated space between the inner hole of the outlet and the fuel solution is defined to easily exhaust the hydrogen gas through the outlet.
11. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein an implant member provided with air holes, for preventing the movement of the gas-liquid separating film and efficiently exhausting hydrogen when the pressure in the fuel tank increases due to the generation of the hydrogen gas or the fuel tank moves, is interposed between the inner surface of the fuel tank and the gas-liquid separating film.
12. The self-regulating hydrogen gas generator as set forth in claim 11 , wherein the gas-liquid separating film is a completely sealed type, which includes the catalytic reactor and the fuel solution and separates the outer surface thereof from the inner wall of the fuel tank by a designated interval.
13. The self-regulating hydrogen gas generator as set forth in claim 6 , wherein the gas-liquid separating means includes a collector floating on the fuel solution filling a designated level of the fuel tank, a collection hole protruded from the collector and exposed to the upper surface of the fuel solution for introducing the hydrogen gas generated in the fuel tank to the collector therethrough, and a drain hose connecting the other side of the collector, opposite to the collection hole, and the outlet, for exhausting the hydrogen gas collected by the collector.
14. The self-regulating hydrogen gas generator as set forth in claim 3 , wherein the catalyst-fixing member includes: both wings, formed at both ends thereof, sliding on the inner surface of a tube; and a catalyst-fixing section interposed between the wings for fixing the catalyst.
15. The self-regulating hydrogen gas generator as set forth in claim 14 , wherein a permanent magnet is attached to the catalyst-fixing section so that the catalyst made of metal is attached to the catalyst-fixing section using the permanent magnet without any separate process.
16. The self-regulating hydrogen gas generator as set forth in claim 14 , wherein the catalyst-fixing section is divided into plural pieces for increasing a contact area between the catalyst and the fuel solution to generate a great amount of hydrogen gas.
17. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein the fuel tank includes hydrogen gas retaining means for converting hydrogen gas in a fine foam state, generated by the contact of the fuel solution and the catalyst, into large-sized hydrogen gas bubbles and allowing the obtained large-sized gas bubbles to pass through the gas-liquid separating means.
18. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein the catalytic reactor is provided inside the hydrogen gas retaining means provided with a plurality of holes for converting hydrogen gas in a fine foam state, generated by the contact of the fuel solution and the catalyst, into large-sized hydrogen gas bubbles and allowing the obtained large-sized gas bubbles to pass through the gas-liquid separating means.
19. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein at least one collision member for preventing hydrogen gas in a fine foam state, generated in the fuel tank, containing moisture, from directly contacting the gas-liquid separating film, is interposed between the fuel solution and the gas-liquid separating film.
20. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein the fuel tank includes a hole for exhausting the waste fuel solution or its by-products from the fuel tank therethrough and for filling the fuel tank with a new fuel solution therethrough.
21. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein the fuel tank includes a vent hole for preventing the overpressure of the fuel tank.
22. The self-regulating hydrogen gas generator as set forth in claim 14 , wherein the catalyst, which is made of Raney Ni, is attached to a net or substrate in distilled water or general water using an adhesive agent, which is solidified in the water without using a separate dry or surface oxidation process, and is then combined with the catalyst-fixing section.
23. The self-regulating hydrogen gas generator as set forth in claim 2 , wherein the elastic means includes a compressed coil spring.
24. The self-regulating hydrogen gas generator as set forth in claim 2 , wherein the elastic means includes compressible gas.
25. The self-regulating hydrogen gas generator as set forth in claim 10 , wherein, in case that a plurality of spaces not-filled with the fuel solution are divisionally obtained by respectively installing a plurality of the gas-liquid separating films at left, right, upper and lower portions, of the inside of the fuel tank filled with the fuel solution, a connection pipe connects the divided spaces, not-filled with the fuel solution, in the fuel tank.
26. The self-regulating hydrogen gas generator as set forth in claim 1 , wherein a heating medium for generating heat is installed in at least one of the fuel tank, the catalytic reactor and the catalyst-fixing member.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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KR10-2003-0019557 | 2003-03-28 | ||
KR20030019557 | 2003-03-28 | ||
KR10-2004-0017413 | 2004-03-15 | ||
KR1020040017413A KR100671281B1 (en) | 2003-03-28 | 2004-03-15 | Hydrogen gas generator |
PCT/KR2004/000675 WO2004085307A1 (en) | 2003-03-28 | 2004-03-25 | Hydrogen gas generator |
Publications (1)
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US20060185242A1 true US20060185242A1 (en) | 2006-08-24 |
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US10/550,723 Abandoned US20060185242A1 (en) | 2003-03-28 | 2004-03-25 | Hydrogen gas generator |
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US (1) | US20060185242A1 (en) |
JP (1) | JP2006521277A (en) |
DE (1) | DE112004000485T5 (en) |
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Also Published As
Publication number | Publication date |
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DE112004000485T5 (en) | 2006-02-09 |
JP2006521277A (en) | 2006-09-21 |
WO2004085307A1 (en) | 2004-10-07 |
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