US3814570A - Apparatus for automatic correction of the positioning control of a burner - Google Patents

Apparatus for automatic correction of the positioning control of a burner Download PDF

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Publication number
US3814570A
US3814570A US00356230A US35623073A US3814570A US 3814570 A US3814570 A US 3814570A US 00356230 A US00356230 A US 00356230A US 35623073 A US35623073 A US 35623073A US 3814570 A US3814570 A US 3814570A
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combustion air
ram
valve
volumetric
combustion
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F Guigues
M Pillard
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties

Definitions

  • ABSTRACT [22] Filed: May 1, 1973 [21] AWL No; 356,230 Apparatus for automatically correcting the ratio between the volumetric flows of combustion air and of fuel of a burner comprising an opacimeter which de- Foreign Application Priority Data livers an electric signal proportional to the opacity of May 1, 1972 France 72.20971 the fumes of combustion and a servo mechanism, for example an electric ram controlled by said signal, [52] us. Cl.
  • the present invention relates to an apparatus for automatic correction, based on the opacity of the fumes, of the ratio between the volumetric combustion air flow and the volumetric fuel flow of a burner, which ratio is maintained constant by a positioning control.
  • the technical field of the invention is that of the construction ofburners for pulverulent, liquid or gaseous fuels and more particularly the control apparatus with which these burners are fitted.
  • Burners with a very high heating capacity which are fitted in certain furnaces or steam generating boilers for example, are generally provided with a much improved control sequence known as measuring control, including apparatus for measuring both the fuel flow and the combustion air flow which deliver control signals acting on relays with derived, proportional or integral action, which relays act in turn on servo-motors which control the flow of fuel and the flow of combustion air.
  • measuring control including apparatus for measuring both the fuel flow and the combustion air flow which deliver control signals acting on relays with derived, proportional or integral action, which relays act in turn on servo-motors which control the flow of fuel and the flow of combustion air.
  • Such control sequences it is possible to cause correction signals to act on the relays and it has already been proposed to use a signal provided by an opacimeter, which measures the opacity of the combustion fumes, as a correction signal.
  • an opacimeter generally consists of a photo-electric receiver which picks up a light bundle which has passed through the combustion fumes.
  • a control has also been proposed in which the signal provided by an opacimeter acts on a relay which controls a servo-motor acting on the combustion air valve. ln such a control, the flow of air is controlled directly as a function of the opacity of the fumes and independently of the fuel flow.
  • a positioning control means a control which has means for simultaneously varying the volumetric fuel and combustion air flows, without measuring these flows, and maintaining a constant ratio between them.
  • Such apparatus have a pressure or temperature probe situated in the circuit of the hot gases, hot water or steam produced by the apparatus to which the burner is fitted, which probe acts on the operating rate of the burner.
  • They include an air-valve for controlling the combustion air flow, the extent of the opening of which is controlled automatically by motion transmission apparatus having cams and pivoted arms.
  • the shape of the cams and/or the lengths of the pivoted arms, which consist of rods and levers, are defined experimentally during commissioning trials, so that the ratio between the volumetric combustion air flow distributed by the air valve and the volumetric fuel flow remains constant for all operating rates and equal to the ratio which corresponds to the best quality of combustion.
  • Such a positioning control is much less costly than a measuring control sequence, as it requires only one probe, one relay and mechanical motion transmissions. For this reason it is generally used in fire-boxes having a low or medium heating capacity.
  • this control does not take into account the differences in density in the combustion air due to temperature variations between night and day or between winter and summer, or possible variations in the temperature, viscosity, calorific power and pressure of the fuel, which result in modifications in the ratio between the mass flow rates of comburant air and fuel, it being possible for this ratio to depart from the limits fixed by regulations for preventing pollution of the atmosphere.
  • the object of the present invention is to automatically correct the ratio between the volumetric combustion air flow and the volumetric fuel flow of a burner, which burner has an air-valve for controlling the combustion air flow, the extent of the opening of which is automatically controlled by a positioning control apparatus having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio.
  • the solution enabling this object to be achieved consists of providing the said burner with an opacimeter which delivers an electrical signal proportional to the opacity of the combustion fumes and a servomechanism, controlled by the said electrical signal, which automatically varies a dimension of at least one of the said arms.
  • the said servo-motor preferably consists of an electric ram of variable length, forming a portion of the length of one of the said arms.
  • An apparatus in accordance with the invention includes an apparatus for measuring the electrical signal delivered by the opacimeter, which apparatus has two adjustable thresholds arranged on either side of a median position and determines the extension of the ram when one of the thresholds is exceeded and the retraction of the ram when the other threshold is exceeded.
  • a cyclic circuit-breaker is inserted between the said measuring apparatus and the said ram to avoid 0scillations of the ram.
  • Opacimeters are known which are used as apparatus for measuring the opacity of fumes and which consist of a light source and a photo-electric receiver which picks up the light bundle emitted by the said light source and reflected by the combustion fumes.
  • Such apparatus deliver an electrical voltage proportional to the opacity of the fumes and they are very sensitive in the almost invisible range of fumes having a Bacharach index of less than 5.
  • a reflection opacimeter. is used, which offers the advantage of being able to act on the ratio between the volumetric flows of combustion air and fuel, while keeping the combustion fumes practically invisible, the Bacharach index of the latter remaining between 2 and 4 for example, which corresponds to very good combustion.
  • the result of the invention is an apparatus for automatically correcting a positioning control so that the opacity of the fumes always remains below a threshold and is in constant compliance with combustion quality regulations.
  • Another advantage of the apparatus in accordance with the invention results from the fact that it can be adapted easily to known controls and controls which have already been installed.
  • the single FIGURE shows a known positioning control consisting of:
  • a probe 1 which measures a value linked to the operation of the firebox, for example the steam pressure or the water temperature in the case of a boiler.
  • This regulator is a relay which makes an analog conversion of the value measured by the probe into a modulated pressure in the case of a pneumatic control sequence, or a modulated voltage in the case of an electric or electronic control sequence.
  • a relay 3 enabling the operation of the burner to be controlled either manually or automatically.
  • a motorised valve 4 positioned in conduit 4a which carries fuel to the burner (not shown).
  • Valve 4 is a pneumatic valve, for example, opening of which is modulated by the modulated pressure delivered by regulator 2.
  • a servo-motor 5 which controls the pivoting of a cam 5a.
  • Servo-motor 5 is a pneumatic ram, for example, movements of which are modulated in parallel to the opening of valve '4, by the modulated pressure delivered by regulator 2. e
  • the lever closest to cam 5a has a roller 11a which bears against the outline of the cam.
  • Air valve 6 is a double butterfly valve, for example, positioned in the intake or delivery conduit of a fan 6a or an air-flap, or a sleeve sliding around air openings cut out of the side wall of the burner.
  • the above assembly constitutes a positioning control well known to the man of the art and no purpose will be served by describing it in more detail.
  • regulator 2 determines an increase in the fuel flow, i.e. opening of valve 4, it simultaneously determines the pivoting of cam 5a in such a direction that air-valve 6 opens and the combustion air flow varies in the same direction as the fuel flow. Conversely, if regulator 2 determines a reduction in the fuel flow, the rotation of cam 50 causes an attendant reduction in the air flow by means of rod-system 11.
  • cam 5a could be positioned in the control of valve 4, or the apparatus can have two cams, one in the control of air-valve 5 and the other in the control of valve 4.
  • an opacimeter consisting of a light source 13a and a photo-electric receiver 13b which picks up a light bundle reflected by the fumes in the case of the figure.
  • Reference 7 indicates the opacimeter box containing the electronic circuitry and possibly the light source and the photo-electric cell connected to the fume conduit by optical fibres 7a.
  • an electric double-acting ram 10 enabling the length of rod 11 to be varied to lengthen or shorten it in accordance with the direction of rotation of the ram.
  • This electric ram could be replaced by any equivalent apparatus, such as a pneumatic or hydraulic ram, for example.
  • the amplified current supplied by opacimeter 7 acts on relays which control the operation of the ram in one direction or the other, depending upon the direction of variation of the current.
  • the burner In normal operation the burner is supplied with a small excess of air which leads to practically invisible fumes. If the opacity increases, this signifies that the ratio between the quantities of air and fuel is decreasing. In this case, the ram acts on the length of rod 11 in the direction which increases the air flow. If, on the other hand, the opacity of the fumes decreases, this signifies that the air over fuel ratio is increasing, and if no correction were made, there would be a risk of reaching an excess of air which would be prejudicial to efficiency.
  • ram 10 acts on rod 11 in the opposite direction, i.e. in the direction which decreases the opening of air-valve 6.
  • an apparatus with adjustable thresholds 8 e.g. an indexed milliammeter, so that while the current delivered by the opacimeter is between the two thresholds, it has no effect on the ram.
  • a lower threshold is set corresponding to a Bacharach index equal to 2
  • an upper threshold corresponding to a Bacharach index equal to 4. It is known that while the opacity of the fumes remains between these two thresholds, the fumes remain practically invisible and combustion is very good.
  • the milliammeter can obviously be replaced by threshold relays or any equivalent electronic comparison apparatus.
  • References 9a and 9b indicate a double-contact.
  • cyclic circuit-breaker This can be replaced by a programmer which delivers one or more ram control pulses at each rotation. Oscillations of the ram are avoided by means of this cyclic circuit-breaker.
  • extreme position circuit-breakers l4 closed by the air-valve are employed, which eliminate the action of the ram when they are closed.
  • Apparatus for automatically correcting the ratio between the volumetric combustion airflow and the volumetric fuel flow of a burner including an air-valve for regulating the combustion airflow, the extent of the opening of which valve is controlled automatically by a positioning control device having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio, which apparatus includes a reflection opacimeter comprising a light source and a photoelectric receiver sensing a light bundle emitted by the light source and reflected by the combustion fumes, which opacimeter delivers an electric signal proportional to the opacity of the combustion fumes, and which apparatus includes a servomechanism for automatically varying a dimension of at least one of the said arms as a function of the said electric signal.
  • Apparatus for automatically correcting the .ratio between the volumetric combustion air flow and the volumetric fuel flow of a burner including an air-valve for regulating the combustion air flow, the extent of the opening of which valve is controlled automatically by a positioning control device having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio, which apparatus includes a reflection opacimeter comprising a light source and a photoelectric receiver sensing a light bundle emitted by the light source and reflected by the combustion fumes, which opacimeter delivers an electric signal proportional to the opacity of the combustion fumes, and which apparatus includes an electric ram of variable length having two operating directions, which ram forms a portion of the length of one of the said arms, and is operated by said electric signal.
  • Apparatus for automatically correcting the ratio between the volumetric combustion air flow and the volumetric fuel flow of a burner including an air-valve for regulating the combustion air flow, the extent of the opening of which valve is controlled automatically by a positioning control device having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio, which apparatus includes an opacimeter which delivers an electric signal proportional to the opacity of the combustion fumes and a servomechanism for automatically lengthening or shortening of at least one of the said arms as a function of the said electric signal, which servomechanism comprises an electric ram of variable length having two operating directions, forming a portion of the length of one of the said arms and an apparatus for measuring the said electric signal delivered by the opacimeter, which apparatus has two adjustable thresholds arranged on either side of a median position and determines the lengthening of the said ram when one of the thresholds is exceeded and the shortening of the said ram when the other threshold is exceeded.
  • Apparatus for automatically correcting the ratio between the volumetric combustion air flow and the volumetric. fuel flow of a burner including an air-valve for regulating the combustion air flow, the extent of the opening of which valve is controlled automatically by a positioning control apparatus having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio, which apparatus includes an opacimeter which delivers an electric signal proportional to the opacity of the combustion fumes, and a servomechanism for automatically varying a dimension of at least one of thesaid arms as a function of the said electrical, Signal, and in which the said air-valve for regulating the flow of combustion air has two circuit-breakers on which the said air-valve acts when it reaches its wide open or completely closed positions, respectively, which circuitbreakers are inserted in the electric control circuitry of the said servo-mechanism.
  • Apparatus for automatically correcting the ratio between the'volumetric combustion air flow and the volumetric fuel flow of a burner including an air-valve for regulating the combustion air flow, the extent of the opening of which valve is controlled automatically by a positioning control device having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio
  • apparatus includes a reflection opacimeter comprising a light source and a photoelectric receiver sensing a light bundle emitted by the light source and reflected by the combustion fumes, which opacimeter delivers an electric signal proportional to the opacity of the combustion fumes
  • which apparatus includes an electric ram of variable length having two operating directions, which ram forms a portion of the length of one of said arms and is operated by said electric signal
  • apparatus includes an apparatus for measuring the said electric signal delivered by the opacimeter which measuring apparatus has two adjustable thresholds arranged on either side of a median position, and determines the extension of the said ram when one of the thresholds is exceeded, and the
  • Apparatus for automatically correcting the ratio between the volumetric combustion air flow and the volumetric fuel flow of a burner including an air-valve for regulating the combustion air flow, the extent of the opening of which valve is controlled automatically by a positioning control device having cams and pivoted arms which simultaneously vary the volumetric flows of fuel and combustion air in a constant ratio, which source and a photoelectric receiver sensing a light bundle emitted by the light source and reflected by the combustion fumes, which opacimeter delivers an electric signal proportional to the opacity of the combus tion fumes, and which apparatus includes an electric ram of variable length having two operating directions, which ram? forms a portion of the length of one of said arms, and is operated by said electric signal, which apparatus includes an apparatus for measuring the said electric signal delivered by the opacimeter. which meathe said ram.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
US00356230A 1972-05-31 1973-05-01 Apparatus for automatic correction of the positioning control of a burner Expired - Lifetime US3814570A (en)

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FR7220971*A FR2187094A5 (US20100056889A1-20100304-C00004.png) 1972-05-31 1972-05-31

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CA (1) CA969249A (US20100056889A1-20100304-C00004.png)
DE (1) DE2322272A1 (US20100056889A1-20100304-C00004.png)
FR (1) FR2187094A5 (US20100056889A1-20100304-C00004.png)
GB (1) GB1419894A (US20100056889A1-20100304-C00004.png)

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947217A (en) * 1972-09-22 1976-03-30 Smit Nijmegan B.V. Process and apparatus for the production of inert gas
US3973898A (en) * 1973-12-19 1976-08-10 Seymour Seider Automatic combustion control with improved electrical circuit
US4032285A (en) * 1974-12-19 1977-06-28 Brown, Boveri & Cie. A.G. Method and apparatus for the automatic control of the air ratio of a combustion process
US4043743A (en) * 1976-08-09 1977-08-23 B.S.C. Industries Corporation Combustion control system
US4125090A (en) * 1975-11-25 1978-11-14 Toyota Jidosha Kogyo Kabushiki Kaisha Control method and system for car-mounted fuel reformer
US4157238A (en) * 1975-12-16 1979-06-05 Berkum Robert A Van Control system for combustion apparatus and method
US4249886A (en) * 1979-05-22 1981-02-10 Westinghouse Electric Corp. Combustion control system
US4264297A (en) * 1976-12-15 1981-04-28 Berkum Robert A Van Control system for combustion apparatus
US4329137A (en) * 1979-05-02 1982-05-11 Stig Werne Device for choke adjustment
US4340355A (en) * 1980-05-05 1982-07-20 Honeywell Inc. Furnace control using induced draft blower, exhaust gas flow rate sensing and density compensation
US4349330A (en) * 1979-05-02 1982-09-14 Orion Machinery Co., Ltd. Combustion control device for nozzle spray type burner
US4362269A (en) * 1981-03-12 1982-12-07 Measurex Corporation Control system for a boiler and method therefor
US4439138A (en) * 1978-06-12 1984-03-27 Aqua-Chem, Inc. Combustion control apparatus
US4479774A (en) * 1982-06-28 1984-10-30 Westinghouse Electric Corp. Combustion control system
US4486166A (en) * 1982-08-12 1984-12-04 Westinghouse Electric Corp. Jackshaft controlled boiler combustion control system
US4509912A (en) * 1975-12-16 1985-04-09 Vanberkum Robert A Combustion efficiency improving apparatus
US4551088A (en) * 1982-06-28 1985-11-05 Westinghouse Electric Corp. Combustion control system
US5010827A (en) * 1990-05-08 1991-04-30 Wyerehaeuser Company Apparatus for detecting carryover particles in the interior of a furnace
US5310335A (en) * 1992-05-05 1994-05-10 Robert A. Van Berkum Trim system for fuel combustion systems
US5368471A (en) * 1991-11-20 1994-11-29 The Babcock & Wilcox Company Method and apparatus for use in monitoring and controlling a black liquor recovery furnace
US5599179A (en) * 1994-08-01 1997-02-04 Mississippi State University Real-time combustion controller
US5605452A (en) * 1995-06-06 1997-02-25 North American Manufacturing Company Method and apparatus for controlling staged combustion systems
US5887583A (en) * 1996-07-31 1999-03-30 Hauck Manufacturing Company Mass flow control system and method for asphalt plant
US6638061B1 (en) 2002-08-13 2003-10-28 North American Manufacturing Company Low NOx combustion method and apparatus
US20060246388A1 (en) * 2005-04-29 2006-11-02 Hauck Manufacturing Company Reduced NOx method of combustion
US20080149872A1 (en) * 2006-12-22 2008-06-26 David Deng Valve assemblies for heating devices
US20090017406A1 (en) * 2007-06-14 2009-01-15 Farias Fuentes Oscar Francisco Combustion control system of detection and analysis of gas or fuel oil flames using optical devices
US20100067908A1 (en) * 2005-09-29 2010-03-18 Broadlight, Ltd. Enhanced Passive Optical Network (PON) Processor
US20100304317A1 (en) * 2006-12-22 2010-12-02 David Deng Control valves for heaters and fireplace devices
US20100330518A1 (en) * 2009-06-29 2010-12-30 David Deng Heat engine with nozzle
US20110081620A1 (en) * 2006-05-17 2011-04-07 Continental Appliances, Inc. D.B.A. Procom Oxygen depletion sensor
US8235708B2 (en) 2006-05-17 2012-08-07 Continental Appliances, Inc. Heater configured to operate with a first or second fuel
US8281781B2 (en) 2006-05-17 2012-10-09 Continental Appliances, Inc. Dual fuel heater
US8752541B2 (en) 2010-06-07 2014-06-17 David Deng Heating system
US8764436B2 (en) 2006-12-22 2014-07-01 Procom Heating, Inc. Valve assemblies for heating devices
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
US9200801B2 (en) 2007-03-14 2015-12-01 Procom Heating, Inc. Fuel selection valve assemblies
US9222670B2 (en) 2010-12-09 2015-12-29 David Deng Heating system with pressure regulator
US9423123B2 (en) 2013-03-02 2016-08-23 David Deng Safety pressure switch
US9739389B2 (en) 2011-04-08 2017-08-22 David Deng Heating system
US9752779B2 (en) 2013-03-02 2017-09-05 David Deng Heating assembly
US9752782B2 (en) 2011-10-20 2017-09-05 David Deng Dual fuel heater with selector valve
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

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DE2753520C2 (de) * 1977-12-01 1986-01-23 H. Saacke Kg, 2800 Bremen Vorrichtung zum Optimieren des Luft/Brennstoffverhältnisses von mit gasförmigen oder flüssigen Brennstoffen betriebenen Feuerungsanlagen

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US3292855A (en) * 1965-10-01 1966-12-20 Exxon Research Engineering Co Microwave sensing apparatus and method for burner control
US3549089A (en) * 1968-07-26 1970-12-22 Hays Corp Method and means for trimming position control members
US3701622A (en) * 1970-07-20 1972-10-31 Viateur Ducasse Excess smoke eliminating system for boilers

Patent Citations (3)

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US3292855A (en) * 1965-10-01 1966-12-20 Exxon Research Engineering Co Microwave sensing apparatus and method for burner control
US3549089A (en) * 1968-07-26 1970-12-22 Hays Corp Method and means for trimming position control members
US3701622A (en) * 1970-07-20 1972-10-31 Viateur Ducasse Excess smoke eliminating system for boilers

Cited By (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947217A (en) * 1972-09-22 1976-03-30 Smit Nijmegan B.V. Process and apparatus for the production of inert gas
US3973898A (en) * 1973-12-19 1976-08-10 Seymour Seider Automatic combustion control with improved electrical circuit
US4032285A (en) * 1974-12-19 1977-06-28 Brown, Boveri & Cie. A.G. Method and apparatus for the automatic control of the air ratio of a combustion process
US4125090A (en) * 1975-11-25 1978-11-14 Toyota Jidosha Kogyo Kabushiki Kaisha Control method and system for car-mounted fuel reformer
US4157238A (en) * 1975-12-16 1979-06-05 Berkum Robert A Van Control system for combustion apparatus and method
US4509912A (en) * 1975-12-16 1985-04-09 Vanberkum Robert A Combustion efficiency improving apparatus
US4043743A (en) * 1976-08-09 1977-08-23 B.S.C. Industries Corporation Combustion control system
US4264297A (en) * 1976-12-15 1981-04-28 Berkum Robert A Van Control system for combustion apparatus
US4439138A (en) * 1978-06-12 1984-03-27 Aqua-Chem, Inc. Combustion control apparatus
US4329137A (en) * 1979-05-02 1982-05-11 Stig Werne Device for choke adjustment
US4349330A (en) * 1979-05-02 1982-09-14 Orion Machinery Co., Ltd. Combustion control device for nozzle spray type burner
US4249886A (en) * 1979-05-22 1981-02-10 Westinghouse Electric Corp. Combustion control system
US4340355A (en) * 1980-05-05 1982-07-20 Honeywell Inc. Furnace control using induced draft blower, exhaust gas flow rate sensing and density compensation
US4362269A (en) * 1981-03-12 1982-12-07 Measurex Corporation Control system for a boiler and method therefor
US4479774A (en) * 1982-06-28 1984-10-30 Westinghouse Electric Corp. Combustion control system
US4551088A (en) * 1982-06-28 1985-11-05 Westinghouse Electric Corp. Combustion control system
US4486166A (en) * 1982-08-12 1984-12-04 Westinghouse Electric Corp. Jackshaft controlled boiler combustion control system
WO1991017395A1 (en) * 1990-05-08 1991-11-14 Weyerhaeuser Company An apparatus for detecting carryover particles in the interior of a furnace
US5010827A (en) * 1990-05-08 1991-04-30 Wyerehaeuser Company Apparatus for detecting carryover particles in the interior of a furnace
US5368471A (en) * 1991-11-20 1994-11-29 The Babcock & Wilcox Company Method and apparatus for use in monitoring and controlling a black liquor recovery furnace
US5310335A (en) * 1992-05-05 1994-05-10 Robert A. Van Berkum Trim system for fuel combustion systems
US5599179A (en) * 1994-08-01 1997-02-04 Mississippi State University Real-time combustion controller
US5605452A (en) * 1995-06-06 1997-02-25 North American Manufacturing Company Method and apparatus for controlling staged combustion systems
US5887583A (en) * 1996-07-31 1999-03-30 Hauck Manufacturing Company Mass flow control system and method for asphalt plant
US6638061B1 (en) 2002-08-13 2003-10-28 North American Manufacturing Company Low NOx combustion method and apparatus
US20060246388A1 (en) * 2005-04-29 2006-11-02 Hauck Manufacturing Company Reduced NOx method of combustion
US20100067908A1 (en) * 2005-09-29 2010-03-18 Broadlight, Ltd. Enhanced Passive Optical Network (PON) Processor
US8281781B2 (en) 2006-05-17 2012-10-09 Continental Appliances, Inc. Dual fuel heater
US9416977B2 (en) 2006-05-17 2016-08-16 Procom Heating, 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
US20110081620A1 (en) * 2006-05-17 2011-04-07 Continental Appliances, Inc. D.B.A. Procom Oxygen depletion sensor
US8516878B2 (en) 2006-05-17 2013-08-27 Continental Appliances, Inc. Dual fuel heater
US8235708B2 (en) 2006-05-17 2012-08-07 Continental Appliances, Inc. Heater configured to operate with a first or second fuel
US9140457B2 (en) 2006-05-30 2015-09-22 David Deng Dual fuel heating system and air shutter
US10066838B2 (en) 2006-05-30 2018-09-04 David Deng Dual fuel heating system
US8317511B2 (en) 2006-12-22 2012-11-27 Continental Appliances, Inc. Control valves for heaters and fireplace devices
US8764436B2 (en) 2006-12-22 2014-07-01 Procom Heating, Inc. Valve assemblies for heating devices
US20080149872A1 (en) * 2006-12-22 2008-06-26 David Deng Valve assemblies for heating devices
US8545216B2 (en) * 2006-12-22 2013-10-01 Continental Appliances, Inc. Valve assemblies for heating devices
US9328922B2 (en) 2006-12-22 2016-05-03 Procom Heating, Inc. Valve assemblies for heating devices
US20100304317A1 (en) * 2006-12-22 2010-12-02 David Deng Control valves for heaters and fireplace devices
US9581329B2 (en) 2007-03-14 2017-02-28 Procom Heating, Inc. Gas-fueled heater
US9200801B2 (en) 2007-03-14 2015-12-01 Procom Heating, Inc. Fuel selection valve assemblies
US20090017406A1 (en) * 2007-06-14 2009-01-15 Farias Fuentes Oscar Francisco Combustion control system of detection and analysis of gas or fuel oil flames using optical devices
US8070482B2 (en) * 2007-06-14 2011-12-06 Universidad de Concepción Combustion control system of detection and analysis of gas or fuel oil flames using optical devices
US8517718B2 (en) 2009-06-29 2013-08-27 David Deng Dual fuel heating source
US20100330518A1 (en) * 2009-06-29 2010-12-30 David Deng Heat engine with nozzle
US20100330519A1 (en) * 2009-06-29 2010-12-30 David Deng Dual fuel heating source
US8757202B2 (en) 2009-06-29 2014-06-24 David Deng Dual fuel heating source
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
US9829195B2 (en) 2009-12-14 2017-11-28 David Deng Dual fuel heating source with nozzle
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
US8752541B2 (en) 2010-06-07 2014-06-17 David Deng Heating system
US10073071B2 (en) 2010-06-07 2018-09-11 David Deng Heating system
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
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
US9022064B2 (en) 2012-05-10 2015-05-05 David Deng Dual fuel control device with auxiliary backline pressure regulator
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

Also Published As

Publication number Publication date
GB1419894A (en) 1975-12-31
CA969249A (en) 1975-06-10
DE2322272A1 (de) 1973-12-13
FR2187094A5 (US20100056889A1-20100304-C00004.png) 1974-01-11

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