US3829279A - Dual fuel burner apparatus - Google Patents

Dual fuel burner apparatus Download PDF

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Publication number
US3829279A
US3829279A US00389888A US38988873A US3829279A US 3829279 A US3829279 A US 3829279A US 00389888 A US00389888 A US 00389888A US 38988873 A US38988873 A US 38988873A US 3829279 A US3829279 A US 3829279A
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fuel
nozzle
primary air
shutter
orifice
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US00389888A
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R Qualley
R Thompson
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Modine Manufacturing Co
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Modine Manufacturing Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14642—Special features of gas burners with jet mixers with more than one gas injection nozzles or orifices for a single mixing tube

Definitions

  • One of the features of this invention is to provide an improved dual fuel burner apparatus in which two fuel nozzles are located adjacent to each other and directed toward and into the entrance end of a fuel and air mixer chamber in combination with a shutter partially blocking primary air flow to the second nozzle but having an open portion providing substantially free flow of primary air to the first fuel as it is emitted from the first fuel nozzle.
  • FIG. 1 is a simplified side elevational view of a mixer, burner and fuel supply for selectively providing one of two different fuels to the mixer in the burner.
  • FIG. 2 is an enlarged fragmentary side elevational view of the apparatus of FIG. 1.
  • FIG. 3 is an elevational view of the fuel supply of the apparatus of this embodiment as viewed substantially from line 3-3 of FIG. 2.
  • a customary burner for the usual plurality of jets of flame as illustrated at 11 with the burner being supplied with a fuel and air mixture from a mixer 12 communicating therewith.
  • This mixer 12 is provided with an entrance end 13 of bell shape of the customary type in which fuel and air are mixed before passing on to the burner 10. This mixture is then ejected from the burner in the customary manner and produces the flames indicated schematically at 11 in FIG. 1.
  • the burner apparatus of this invention provides an automatic device for supplying the proper amount of primary air when the burner operation is switched from natural gas to propane or butane gas and back again by a simple fixed shutter device that although adjustable in postion does not require movement after the position has been determined and the shutter device locked in this position.
  • the mixer-burner is supplied with a first fuel from a manifold l4 and this first fuel may be, for example, natural gas.
  • this first fuel may be, for example, natural gas.
  • an adjustable manifold 15 for a second fuel which may be a gas such as propane.
  • the first manifold 14 is provided with a plurality of first nozzles 16 of which only one is shown and each of these first fuel nozzles 16 has an orifice 17 adjacent the entrance end 13 of the chamber 12 with this first orifice l7 directing fuel and entrained primary air into the mixer and thus into the burner 10.
  • the second manifold 15 is also provided with a plurality of second nozzles 18 of which again only one is shown and it likewise has an orifice 19 located adjacent the entrance end 13 and angled to direct the mixed fuel and primary air into the mixer 12 and thus into the burner 10.
  • the second fuel supplied by the maniold 15 and nozzles 18 is of the type that tends to draw in too much primary air if freely exposed in the manner of the natural gas nozzles 16.
  • a good example of this second fuel is a fuel such as propane.
  • Each of the manifolds l4 and 15 is supplied by its respective fuel pipes 20 and 21.
  • a shutter 22 at and slightly behind the exit from the second nozzle orifice 19 so as to partially block primary air drawn into the emitted second fuel for mixing with the fuel in the mixing chamber 12.
  • the shutter 22 is in the form of an annular plate that is located just rearwardly of the exit end 23 of each second nozzle 18.
  • the shutter 22 has an open portion 24 as seen most clearly in FIG. 3 adjacent to the first nozzle 17 orifice end 25 that provides relatively freer flow of primary air to the fuel exiting from the first nozzle orifice 17.
  • the shutter 22 is provided with spaced rearwardly extending flanges 25 that are at substantially right angles to the planar shutter 22 and that extend rearwardly of the shutter and away from the chamber entrance end 13. These flanges 25 are spaced from and located on opposite sides of the first nozzles 16 so as not to interfere substantially with the flow of primary air into the fuel streams emitted from the first nozzle orifices 17.
  • the shutter 22 may be adjustably positioned longitudinally of the second nozzle 18 so as to determine more precisely the amount of primary air supplied to the fuel from the second nozzles 18. In the illustrated embodiment this adjustment is provided by a surrounding cylindrical collar 26 that is slidable on the exterior of each nozzle 18 and that is locked in position by a set screw 27. Once in the locked position which will be determined by the nature of the fuel supplied by the second manifold 15 the shutter will automatically control the amount of primary air that is permitted to the second fuel without substantial interference with the primary air to the first fuel emitted by the nozzle 16.
  • this invention provides a simple shutter device for controlling the amount of primary air where two or more fuels are supplied selectively to a single burner apparatus and with these fuels requiring different amounts of primary air for proper burning. Thus it is frequently necessary to switch from one fuel to another whenever one of the fuels is in short supply. Thus when the principal fuel is natural gas it is often necessary to switch to a gas such as propane or butane and these fuels require different flow orifices and amounts of primary air because of their different burning characteristics.
  • This invention provides for this automatically because in the sets of nozzles 16 and 18 that receive fuel from different manifolds such as those illustrated at 14 and 15 the internaldimensions of the nozzles can be determined and the adjustable shutter 22 provides the proper amount of primary air.
  • the burner apparatus when the system is operated on natural gas where the entire gas supply will be by way of the manifold 14 and nozzles 16 extending therefrom the burner apparatus will function in its normal manner and when a different type of gas is supplied as through the manifold the different nozzles and the shutters will provide the ideal burning conditions'for this alternate fuel.
  • a dual fuel burner apparatus comprising: a mixer chamber means for fuel and primary air having an entrance end; a first nozzle for a first fuel having an orifice directed into and located adjacent to said entrance end; a second nozzle for a second fuel having an orifice directed into and also located adjacent to said entrance end and adjacent to the first nozzle, said second fuel tending to aspirate more primary air for optimum burning than said first fuel; and a shutter about said second nozzle orifice partially blocking primary air to said second fuel and having an open portion adjacent said first nozzle orifice through which said first nozzle directs fuel and providing relatively freer flow of primary air to said first fuel than to said second fuel.
  • said shutter comprises an annular member extending around said second nozzle orifice adjacent the exit thereof and being annularly continuous except for an open portion at said orifice of the first nozzle through which said first fuel and its primary air are directed.

Abstract

A dual fuel burner apparatus for burning two or more different types of fuel some of which require greater amounts of primary air entrapped with the fuel than others and comprising a first nozzle for a first fuel having an orifice directed into and located adjacent to the entrance end of a mixer chamber of the customary type leading toward a customary burner, a second nozzle for a second fuel having an orifice also directed into and located adjacent to the entrance end and adjacent to the first nozzle with the first fuel requiring more primary air for proper burning than the second fuel, a shutter at the second nozzle orifice partially blocking primary air to the second fuel but having an open portion adjacent the first nozzle orifice providing relatively freer flow of primary air to the first fuel than to the second fuel.

Description

United States Patent [191 Qualley et al. [45] Aug. 13, 1974 DUAL FUEL BURNER APPARATUS Primary Examiner-Carroll B. Dority, Jr. 75 Inventors; Ray w Quauey; Robert L. Attorney, Agent, or Firm-Hofgren, Wegner, Allen,
Thompson, both of Racine, Wis. Stenma" & Mccord [73] Assignee: klodine Manufacturing Company, [57 acme A dual fuel burner apparatus for burning two or more [22] Filed: Aug. 20, 1973 different types of fuel some of which require greater amounts of primary air'entrapped with the fuel than [211 App]' 389888 others and comprising a first nozzle for a first fuel having an orifice directed into and located adjacent to the [52] U.S. Cl. 431/354, 48/180 C' e trance end of a mixer chamber of the customary [51] Int. Cl. F23d 13/40 type ead ng toward a' ry b e a econ [58] Field of Search 431/354, 355, 156; nozzle for a second fuel having an orifice also directed 48/180 C, 180 P, 1803, 180 R into and located adjacent to the entrance end and ad- '1 jacent to the first nozzle with the first fuel requiring [56] References Cited more primary air for proper burning than the second UNITED STATES PATENTS fuel, a shutter at the second nozzle orifice partially l 175 888 3/1916 d 48]]80 blocking primary air to the second fuel but having an I?! 982 mm M 2; 1::1'1::::::::::::::::::::::'i31,354 eeee eeeiee eeieeem the feet eeeele eefiee eeeeeiee relatively freer flow of primary air to thefirst fu to the second fuel.
5 Claims, 3 Drawing Figures BURNER el than PAIENIEn mm 31974 BURNER DUAL FUEL BURNER APPARATUS SUMMARY OF THE INVENTION One of the features of this invention is to provide an improved dual fuel burner apparatus in which two fuel nozzles are located adjacent to each other and directed toward and into the entrance end of a fuel and air mixer chamber in combination with a shutter partially blocking primary air flow to the second nozzle but having an open portion providing substantially free flow of primary air to the first fuel as it is emitted from the first fuel nozzle.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified side elevational view of a mixer, burner and fuel supply for selectively providing one of two different fuels to the mixer in the burner.
FIG. 2 is an enlarged fragmentary side elevational view of the apparatus of FIG. 1.
FIG. 3 is an elevational view of the fuel supply of the apparatus of this embodiment as viewed substantially from line 3-3 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT In the embodiment illustrated in the drawings of the invention there is provided a customary burner for the usual plurality of jets of flame as illustrated at 11 with the burner being supplied with a fuel and air mixture from a mixer 12 communicating therewith. This mixer 12 is provided with an entrance end 13 of bell shape of the customary type in which fuel and air are mixed before passing on to the burner 10. This mixture is then ejected from the burner in the customary manner and produces the flames indicated schematically at 11 in FIG. 1.
In order to burn efficiently different types of fuels such as natural gas and a different gas of which propane is the usual example it is necessary to provide different ratios of primary air to the different types of fuel. Thus, in general, a gas such as propane tends to draw in or aspirate too much primary air for optimum burning. The burner apparatus of this invention provides an automatic device for supplying the proper amount of primary air when the burner operation is switched from natural gas to propane or butane gas and back again by a simple fixed shutter device that although adjustable in postion does not require movement after the position has been determined and the shutter device locked in this position.
In the embodiment illustrated in the drawings the mixer-burner is supplied with a first fuel from a manifold l4 and this first fuel may be, for example, natural gas. There is also provided an adjustable manifold 15 for a second fuel which may be a gas such as propane. The first manifold 14 is provided with a plurality of first nozzles 16 of which only one is shown and each of these first fuel nozzles 16 has an orifice 17 adjacent the entrance end 13 of the chamber 12 with this first orifice l7 directing fuel and entrained primary air into the mixer and thus into the burner 10.
The second manifold 15 is also provided with a plurality of second nozzles 18 of which again only one is shown and it likewise has an orifice 19 located adjacent the entrance end 13 and angled to direct the mixed fuel and primary air into the mixer 12 and thus into the burner 10. The second fuel supplied by the maniold 15 and nozzles 18 is of the type that tends to draw in too much primary air if freely exposed in the manner of the natural gas nozzles 16. As mentioned, a good example of this second fuel is a fuel such as propane. Each of the manifolds l4 and 15 is supplied by its respective fuel pipes 20 and 21.
In order to provide automatic control of the amount of primary air aspirated by the various fuels there is located a shutter 22 at and slightly behind the exit from the second nozzle orifice 19 so as to partially block primary air drawn into the emitted second fuel for mixing with the fuel in the mixing chamber 12. Thus in the illustrated embodiment the shutter 22 is in the form of an annular plate that is located just rearwardly of the exit end 23 of each second nozzle 18. When'the second fuel is emitted through the orifice 19 under the customary high pressure it would ordinarily draw into it the primary air from the atmosphere. However, because of the positioning of the shutter 22 free flow of this primary air is partially blocked so that only the required small amount of primary air is drawn into the exiting fuel.
The shutter 22 has an open portion 24 as seen most clearly in FIG. 3 adjacent to the first nozzle 17 orifice end 25 that provides relatively freer flow of primary air to the fuel exiting from the first nozzle orifice 17. For better control of the primary air supplies to each of the nozzles 16 and 18 the shutter 22 is provided with spaced rearwardly extending flanges 25 that are at substantially right angles to the planar shutter 22 and that extend rearwardly of the shutter and away from the chamber entrance end 13. These flanges 25 are spaced from and located on opposite sides of the first nozzles 16 so as not to interfere substantially with the flow of primary air into the fuel streams emitted from the first nozzle orifices 17.
The shutter 22 may be adjustably positioned longitudinally of the second nozzle 18 so as to determine more precisely the amount of primary air supplied to the fuel from the second nozzles 18. In the illustrated embodiment this adjustment is provided by a surrounding cylindrical collar 26 that is slidable on the exterior of each nozzle 18 and that is locked in position by a set screw 27. Once in the locked position which will be determined by the nature of the fuel supplied by the second manifold 15 the shutter will automatically control the amount of primary air that is permitted to the second fuel without substantial interference with the primary air to the first fuel emitted by the nozzle 16.
The importance of this invention is that it provides a simple shutter device for controlling the amount of primary air where two or more fuels are supplied selectively to a single burner apparatus and with these fuels requiring different amounts of primary air for proper burning. Thus it is frequently necessary to switch from one fuel to another whenever one of the fuels is in short supply. Thus when the principal fuel is natural gas it is often necessary to switch to a gas such as propane or butane and these fuels require different flow orifices and amounts of primary air because of their different burning characteristics. This invention provides for this automatically because in the sets of nozzles 16 and 18 that receive fuel from different manifolds such as those illustrated at 14 and 15 the internaldimensions of the nozzles can be determined and the adjustable shutter 22 provides the proper amount of primary air. Thus when the system is operated on natural gas where the entire gas supply will be by way of the manifold 14 and nozzles 16 extending therefrom the burner apparatus will function in its normal manner and when a different type of gas is supplied as through the manifold the different nozzles and the shutters will provide the ideal burning conditions'for this alternate fuel.
Having described our invention as related to the embodiments shown in the accompanying drawings, it is our intention that the invention be not limited by any of the details of description, unless otherwise specified, but rather be construed broadly within its spirit and scope as set out in the appended claims.
We claim:
1. A dual fuel burner apparatus, comprising: a mixer chamber means for fuel and primary air having an entrance end; a first nozzle for a first fuel having an orifice directed into and located adjacent to said entrance end; a second nozzle for a second fuel having an orifice directed into and also located adjacent to said entrance end and adjacent to the first nozzle, said second fuel tending to aspirate more primary air for optimum burning than said first fuel; and a shutter about said second nozzle orifice partially blocking primary air to said second fuel and having an open portion adjacent said first nozzle orifice through which said first nozzle directs fuel and providing relatively freer flow of primary air to said first fuel than to said second fuel.
2. The burner apparatus of claim 1 wherein said shutter comprises an annular member extending around said second nozzle orifice adjacent the exit thereof and being annularly continuous except for an open portion at said orifice of the first nozzle through which said first fuel and its primary air are directed.
3. The burner apparatus of claim 2 wherein said shutter is provided with spaced flanges extending away from the shutter and said chamber at said opening, the flanges being located on opposite sides of said first nozzle orifice.
4. The burner apparatus of claim 2 wherein means are provided for adjustably positioning said shutter longitudinally of said second nozzle orifice.
5. The burner apparatus of claim 2 wherein said shutter is provided with spaced flanges extending away from the shutter and said chamber at said opening, the flanges being located on opposite sides of said first nozzle orifice, and means are provided for adjustably positioning said shutter longitudinally of said second nozzle

Claims (5)

1. A dual fuel burner apparatus, comprising: a mixer chamber means for fuel and primary air having an entrance end; a first nozzle for a first fuel having an orifice directed into and located adjacent to said entrance end; a second nozzle for a second fuel having an orifice directed into and also located adjacent to said entrance end and adjacent to the first nozzle, said second fuel tending to aspirate more primary air for optimum burning than said first fuel; and a shutter about said second nozzle orifice partially blocking primary air to said second fuel and having an open portion adjacent said first nozzle orifice through which said first nozzle directs fuel and providing relatively freer flow of primary air to said first fuel than to said second fuel.
2. The burner apparatus of claim 1 wherein said shutter comprises an annular member extending around said second nozzle orifice adjacent the exit thereof and being annularly continuous except for an open portion at said orifice of the first nozzle through which said first fuel and its primary air are directed.
3. The burner apparatus of claim 2 wherein said shutter is provided with spaced flanges extending away from the shutter and said chamber at said opening, the flanges being located on opposite sides of said first nozzle orifice.
4. The burner apparatus of claim 2 wherein means are provided for adjustably positioning said shutter longitudinally of said second nozzle orifice.
5. The burner apparatus of claim 2 wherein said shutter is provided with spaced flanges extending away from the shutter and said chamber at said opening, the flanges being located on opposite sides of said first nozzle orifice, and means are provided for adjustably positioning said shutter longitudinally of said second nozzle orifice.
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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585452A1 (en) * 1985-07-25 1987-01-30 Sdecc DOUBLE-FLOW PACKAGE INJECTION DEVICE FOR GAS APPLIANCES OF THE GENDER BATTERY OR BOILER HEATER
US5215457A (en) * 1990-01-24 1993-06-01 Worgas Bruciatori S.R.L. Combustion process and gas burner with low nox, co emissions
EP0657693A2 (en) * 1993-12-09 1995-06-14 GoGas Goch GmbH & Co Gasburner
US5658358A (en) * 1993-04-08 1997-08-19 Abb Management Ag Fuel supply system for combustion chamber
EP0959300A3 (en) * 1998-05-19 2000-02-02 Robert Bosch Gmbh Method and device for operating an atmospheric, in particular a fully premixed gas burner
US6082993A (en) * 1999-05-28 2000-07-04 H-Tech, Inc. Induced draft heater with premixing burners
US20080149872A1 (en) * 2006-12-22 2008-06-26 David Deng Valve assemblies for heating devices
US20080227045A1 (en) * 2007-03-15 2008-09-18 David Deng Fuel selectable heating devices
US20090280448A1 (en) * 2008-05-12 2009-11-12 Coprecitec, S.L. Multiple gas pilot burner
US20100095945A1 (en) * 2007-03-09 2010-04-22 Steve Manning Dual fuel vent free gas heater
US20100170503A1 (en) * 2006-05-17 2010-07-08 David Deng Heater configured to operate with a first or second fuel
US20100326430A1 (en) * 2009-06-29 2010-12-30 David Deng Dual fuel heating system and air shutter
US7967006B2 (en) 2006-05-17 2011-06-28 David Deng Dual fuel heater
US8011920B2 (en) 2006-12-22 2011-09-06 David Deng Valve assemblies for heating devices
US8057219B1 (en) * 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US8241034B2 (en) 2007-03-14 2012-08-14 Continental Appliances Inc. Fuel selection valve assemblies
US8317511B2 (en) 2006-12-22 2012-11-27 Continental Appliances, Inc. Control valves for heaters and fireplace devices
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US8516878B2 (en) 2006-05-17 2013-08-27 Continental Appliances, Inc. Dual fuel heater
US8752541B2 (en) 2010-06-07 2014-06-17 David Deng Heating system
US8915239B2 (en) 2011-10-20 2014-12-23 David Deng Dual fuel heater with selector valve
US8985094B2 (en) 2011-04-08 2015-03-24 David Deng Heating system
US9022064B2 (en) 2012-05-10 2015-05-05 David Deng Dual fuel control device with auxiliary backline pressure regulator
US9091431B2 (en) 2012-09-13 2015-07-28 David Deng Dual fuel valve with air shutter adjustment
US9170016B2 (en) 2012-08-22 2015-10-27 David Deng Dual fuel heater with selector valve
US9175848B2 (en) 2011-12-05 2015-11-03 David Deng Dual fuel heater with selector valve
US9200802B2 (en) 2011-04-08 2015-12-01 David Deng Dual fuel heater with selector valve
US9222670B2 (en) 2010-12-09 2015-12-29 David Deng Heating system with pressure regulator
WO2015123149A3 (en) * 2013-02-14 2015-12-30 Clearsign Combustion Corporation Burners with flame control and positioning, and related methods
US9423123B2 (en) 2013-03-02 2016-08-23 David Deng Safety pressure switch
US9523497B2 (en) 2012-07-04 2016-12-20 David Deng Dual fuel heater with selector valve
US9739389B2 (en) 2011-04-08 2017-08-22 David Deng Heating system
US9752779B2 (en) 2013-03-02 2017-09-05 David Deng Heating assembly
US9829195B2 (en) 2009-12-14 2017-11-28 David Deng Dual fuel heating source with nozzle
US10073071B2 (en) 2010-06-07 2018-09-11 David Deng Heating system
US10222057B2 (en) 2011-04-08 2019-03-05 David Deng Dual fuel heater with selector valve
US10240789B2 (en) 2014-05-16 2019-03-26 David Deng Dual fuel heating assembly with reset switch
US10429074B2 (en) 2014-05-16 2019-10-01 David Deng Dual fuel heating assembly with selector switch

Cited By (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585452A1 (en) * 1985-07-25 1987-01-30 Sdecc DOUBLE-FLOW PACKAGE INJECTION DEVICE FOR GAS APPLIANCES OF THE GENDER BATTERY OR BOILER HEATER
EP0213021A1 (en) * 1985-07-25 1987-03-04 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Double injection device for a pilot light for gas installations
US5215457A (en) * 1990-01-24 1993-06-01 Worgas Bruciatori S.R.L. Combustion process and gas burner with low nox, co emissions
US5658358A (en) * 1993-04-08 1997-08-19 Abb Management Ag Fuel supply system for combustion chamber
EP0657693A2 (en) * 1993-12-09 1995-06-14 GoGas Goch GmbH & Co Gasburner
EP0657693A3 (en) * 1993-12-09 1996-03-20 Gogas Goch Gmbh & Co Gasburner.
EP0959300A3 (en) * 1998-05-19 2000-02-02 Robert Bosch Gmbh Method and device for operating an atmospheric, in particular a fully premixed gas burner
US6082993A (en) * 1999-05-28 2000-07-04 H-Tech, Inc. Induced draft heater with premixing burners
US20100170503A1 (en) * 2006-05-17 2010-07-08 David Deng Heater configured to operate with a first or second fuel
US9416977B2 (en) 2006-05-17 2016-08-16 Procom Heating, Inc. Heater configured to operate with a first or second fuel
US8235708B2 (en) 2006-05-17 2012-08-07 Continental Appliances, Inc. Heater configured to operate with a first or second fuel
US8568136B2 (en) 2006-05-17 2013-10-29 Procom Heating, Inc. Heater configured to operate with a first or second fuel
US8516878B2 (en) 2006-05-17 2013-08-27 Continental Appliances, Inc. Dual fuel heater
US7967006B2 (en) 2006-05-17 2011-06-28 David Deng Dual fuel heater
US7967007B2 (en) 2006-05-17 2011-06-28 David Deng Heater configured to operate with a first or second fuel
US8281781B2 (en) 2006-05-17 2012-10-09 Continental Appliances, Inc. Dual fuel heater
US10066838B2 (en) 2006-05-30 2018-09-04 David Deng Dual fuel heating system
US9140457B2 (en) 2006-05-30 2015-09-22 David Deng Dual fuel heating system and air shutter
US9328922B2 (en) 2006-12-22 2016-05-03 Procom Heating, Inc. Valve assemblies for heating devices
US8297968B2 (en) 2006-12-22 2012-10-30 Continental Appliances, Inc. Pilot assemblies for heating devices
US20080149872A1 (en) * 2006-12-22 2008-06-26 David Deng Valve assemblies for heating devices
US8764436B2 (en) 2006-12-22 2014-07-01 Procom Heating, Inc. Valve assemblies for heating devices
US8545216B2 (en) 2006-12-22 2013-10-01 Continental Appliances, Inc. Valve assemblies for heating devices
US8317511B2 (en) 2006-12-22 2012-11-27 Continental Appliances, Inc. Control valves for heaters and fireplace devices
US8011920B2 (en) 2006-12-22 2011-09-06 David Deng Valve assemblies for heating devices
USRE46308E1 (en) 2007-03-09 2017-02-14 Coprecitec, S.L. Dual fuel heater
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US20100095945A1 (en) * 2007-03-09 2010-04-22 Steve Manning Dual fuel vent free gas heater
US8061347B2 (en) * 2007-03-09 2011-11-22 Coprecitec, S.L. Dual fuel vent free gas heater
US8057219B1 (en) * 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US7766006B1 (en) * 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
US8777609B2 (en) 2007-03-09 2014-07-15 Coprecitec, S.L. Dual fuel heater
US8241034B2 (en) 2007-03-14 2012-08-14 Continental Appliances Inc. Fuel selection valve assemblies
US9200801B2 (en) 2007-03-14 2015-12-01 Procom Heating, Inc. Fuel selection valve assemblies
US9581329B2 (en) 2007-03-14 2017-02-28 Procom Heating, Inc. Gas-fueled heater
US8152515B2 (en) * 2007-03-15 2012-04-10 Continental Appliances Inc Fuel selectable heating devices
US20080227045A1 (en) * 2007-03-15 2008-09-18 David Deng Fuel selectable heating devices
US8137098B2 (en) * 2008-05-12 2012-03-20 Coprecitec, S.L. Multiple gas pilot burner
US20090280448A1 (en) * 2008-05-12 2009-11-12 Coprecitec, S.L. Multiple gas pilot burner
US8757139B2 (en) * 2009-06-29 2014-06-24 David Deng Dual fuel heating system and air shutter
US8465277B2 (en) 2009-06-29 2013-06-18 David Deng Heat engine with nozzle
US8757202B2 (en) 2009-06-29 2014-06-24 David Deng Dual fuel heating source
US20100326430A1 (en) * 2009-06-29 2010-12-30 David Deng Dual fuel heating system and air shutter
US8517718B2 (en) 2009-06-29 2013-08-27 David Deng Dual fuel heating source
US9829195B2 (en) 2009-12-14 2017-11-28 David Deng Dual fuel heating source with nozzle
US8752541B2 (en) 2010-06-07 2014-06-17 David Deng Heating system
US10073071B2 (en) 2010-06-07 2018-09-11 David Deng Heating system
US9021859B2 (en) 2010-06-07 2015-05-05 David Deng Heating system
US8851065B2 (en) 2010-06-07 2014-10-07 David Deng Dual fuel heating system with pressure sensitive nozzle
US9222670B2 (en) 2010-12-09 2015-12-29 David Deng Heating system with pressure regulator
US10222057B2 (en) 2011-04-08 2019-03-05 David Deng Dual fuel heater with selector valve
US9200802B2 (en) 2011-04-08 2015-12-01 David Deng Dual fuel heater with selector valve
US8985094B2 (en) 2011-04-08 2015-03-24 David Deng Heating system
US9739389B2 (en) 2011-04-08 2017-08-22 David Deng Heating system
US9752782B2 (en) 2011-10-20 2017-09-05 David Deng Dual fuel heater with selector valve
US8915239B2 (en) 2011-10-20 2014-12-23 David Deng Dual fuel heater with selector valve
US9175848B2 (en) 2011-12-05 2015-11-03 David Deng Dual fuel heater with selector valve
US9022064B2 (en) 2012-05-10 2015-05-05 David Deng Dual fuel control device with auxiliary backline pressure regulator
US9523497B2 (en) 2012-07-04 2016-12-20 David Deng Dual fuel heater with selector valve
US9170016B2 (en) 2012-08-22 2015-10-27 David Deng Dual fuel heater with selector valve
US9091431B2 (en) 2012-09-13 2015-07-28 David Deng Dual fuel valve with air shutter adjustment
WO2015123149A3 (en) * 2013-02-14 2015-12-30 Clearsign Combustion Corporation Burners with flame control and positioning, and related methods
US9752779B2 (en) 2013-03-02 2017-09-05 David Deng Heating assembly
US9518732B2 (en) 2013-03-02 2016-12-13 David Deng Heating assembly
US9441833B2 (en) 2013-03-02 2016-09-13 David Deng Heating assembly
US9423123B2 (en) 2013-03-02 2016-08-23 David Deng Safety pressure switch
US10240789B2 (en) 2014-05-16 2019-03-26 David Deng Dual fuel heating assembly with reset switch
US10429074B2 (en) 2014-05-16 2019-10-01 David Deng Dual fuel heating assembly with selector switch

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