EP4302015A1 - Gasbrennervorrichtung mit teilweise vorgemischtem gas - Google Patents

Gasbrennervorrichtung mit teilweise vorgemischtem gas

Info

Publication number
EP4302015A1
EP4302015A1 EP21707602.5A EP21707602A EP4302015A1 EP 4302015 A1 EP4302015 A1 EP 4302015A1 EP 21707602 A EP21707602 A EP 21707602A EP 4302015 A1 EP4302015 A1 EP 4302015A1
Authority
EP
European Patent Office
Prior art keywords
gas
chamber
air
valve
outlet pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21707602.5A
Other languages
English (en)
French (fr)
Inventor
Sybrandus Munsterhuis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pittway SARL
Original Assignee
Pittway SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pittway SARL filed Critical Pittway SARL
Publication of EP4302015A1 publication Critical patent/EP4302015A1/de
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details

Definitions

  • the invention relates to a partially-premixed gas burner appliance.
  • gas burner appliances there are in principle two different types of gas burner appliances, namely fully-premixed gas burner appliances and partially-premixed gas burner appliances.
  • both types of these gas burner appli-ances a mixture of gas and air becomes combusted within a combustion chamber of the respective gas burner appliance.
  • the present invention relates to a partially-premixed gas burner appliance.
  • EP 0 390 964 B2 and US 2009/0 197 212 A1 disclose fully-premixed gas burner appliances.
  • an air flow provided by a fan is fully premixed with a gas flow provided by a gas modulator before the resulting gas/air mixture is combusted.
  • EP 0 103 303 A2 discloses a partially-premixed gas burner appliance comprising a combustion chamber in which gas is combusted.
  • a fan provides an air flow to the combustion chamber.
  • the fan is assigned to an exhaust gas outlet port of the com-bustion chamber. Air is sucked into the combustion chamber when the fan being assigned to the exhaust gas outlet port is running, wherein the air enters into the combustion chamber through an air inlet port.
  • An air flow restriction element is as-signed to the air inlet port of the combustion chamber.
  • a gas modulator provides a gas flow to the combustion chamber, namely to a gas burner rod positioned within the combustion chamber.
  • partially-premixed gas burner appliances only a first portion of the air flow provided by a fan is premixed with the gas flow before com-bustion takes place. In partially-premixed gas burner appliances a second portion of the air flow provided by the fan is mixed with the gas while the combustion of the gas takes place.
  • the novel partially-premixed gas burner appliance comprises a combustion cham-ber.
  • the novel partially-premixed gas burner appliance further comprises a fan being configured to provide air or an air flow to the combustion chamber.
  • the fan is as-signed to an air inlet port of the combustion chamber or to an air duct providing the air to the air inlet port.
  • the novel partially-premixed gas burner appliance further comprises an air flow restriction element assigned to the air inlet port of the combustion chamber or to the air duct.
  • the air flow restriction element is configured to cause a pressure drop so that the air pressure downstream of the air flow restriction element is lower than the air pressure of the air flow provided by the fan upstream of the air flow re-striction element.
  • the novel partially-premixed gas burner appliance further comprises a gas modula-tor being configured to provide a gas flow to the combustion chamber.
  • a first portion of the air or air flow provided by the fan is premixed with the gas or gas flow before the gas is combusted.
  • a second portion of the air or air flow provid-ed by the fan is mixed with the gas while the gas is combusted.
  • the gas modulator of the novel partially-premixed gas burner appliance is a pneu-matic gas control valve.
  • the pneumatic gas control valve has a main gas valve, a safety gas valve, a servo gas valve and a gas outlet pressure regulator.
  • Such a pneumatic gas control valve is configured to be used in a fully-premixed gas burner appliance.
  • the gas outlet pressure regulator of the pneumatic gas control valve namely a first chamber of the gas outlet pressure regulator in which a pressure is present that influences the nominal-value of the gas outlet pressure, is connected to the air inlet port of the combustion chamber or to the air duct upstream of the air flow restriction element such that the gas outlet pressure provided by the pneumatic gas control valve depends on the air pressure provided by the fan upstream of the air flow re-striction element.
  • the present invention proposes to make use of a pneumatic gas control valve be-ing configured to be used in a fully-premixed gas burner appliance within a partially-premixed gas burner appliance.
  • the fan is assigned to the air inlet port of the com-bustion chamber or to an air duct providing the air to the air inlet port.
  • the gas out-let pressure regulator of the pneumatic gas control valve namely the first chamber of the same in which the pressure is present that influences the nominal-value of the gas outlet pressure, is connected to the air inlet port of the combustion chamber or to the air duct, namely upstream of the air flow restriction element.
  • the present invention allows a very simple and reliable 1: 1 gas-air control for a partially-premixed gas burner appliance.
  • a gas burner rod having at least two seg-ments is positioned within the combustion chamber, wherein the combustion chamber comprises for each segment of the gas burner rod an individual gas inlet port.
  • the pneumatic gas control valve provides a gas flow to each of the individual gas inlet ports of the combustion chamber.
  • a shut off valve may be assigned to at least one of the individual gas inlet ports to selectively open or close the respective gas inlet port thereby selectively operating the respective segment of the gas burn-er rod.
  • the gas burner rod may not be segmented.
  • a gas burner rod not be-ing segmented does not require a shut off valve assigned to the gas inlet port.
  • the first chamber of the gas outlet pressure regulator of the pneumatic gas control valve is connected to the air inlet port of the combustion chamber through a pipe or duct. This provides a very simple and relia-ble way to balance the air pressure drop with the gas pressure drop.
  • the gas outlet pressure regulator of the pneumatic gas control valve comprises a diaphragm.
  • the first chamber of the gas outlet pressure regulator of the pneumatic gas control valve is positioned on a first side of said diaphragm such that the air pressure being present within the within first chamber acts on the first side of said diaphragm.
  • a second chamber of the gas outlet pressure regulator of the pneumatic gas control valve is positioned on a sec-ond side of said diaphragm, wherein the second chamber of the gas outlet pressure regulator is connected to a gas outlet chamber of the pneumatic gas control valve such that the gas outlet pressure being present within the within second chamber acts on the second side of said diaphragm.
  • the gas outlet pressure regulator fur-ther comprises a first spring and a second spring, wherein a spring force provided by the first spring acts on the first side of said diaphragm and a spring force provid-ed by the second spring acts on the second side of said diaphragm.
  • the gas outlet pressure regulator of the pneumatic gas control valve further comprises a preset-ting unit acting on the first spring to adapt the spring force acting on the first side of said diaphragm thereby adapting the nominal-value of the gas outlet pressure. It is possible to provide a very simple and reliable 1: 1 gas-air control for a partially-premixed gas burner appliance without the need of an electronic gas modulator.
  • Figure 1 shows a preferred embodiment of a partially-premixed gas burner appliance according to the invention
  • Figure 2 shows a cross section through a pneumatic gas control valve of the partially-premixed gas burner appliance of Figure 1.
  • the present invention relates to a partially-premixed gas burner appliance 10.
  • the partially-premixed gas burner appliance 10 comprises a combustion chamber 11 in which gas G is combusted.
  • a gas burner rod 12 having at least two segments 12a, 12b is positioned within the combustion chamber 11.
  • Gas G is provided to the gas burner rod 12 for combustion.
  • the combustion of the gas G takes place under the presence of air A.
  • the combustion of the gas G results into flames 13 and exhaust-gas E.
  • the gas burner rod 12 may not be segmented in multiple segments.
  • a heat exchanger 14 is positioned within the combustion chamber 11.
  • the heat exchanger 14 is used to heat e.g. sanitary water or central heating water W for a water consumer.
  • the water W to be heated within the heat exchanger 14 is provided by a supply pipe 15 to the heat exchanger 14. Water W which has been heated within the heat exchanger 14 is flowing through a return pipe 16 to the respective water consumer.
  • the partially-premixed gas burner appliance 10 comprises a fan 17.
  • the fan 17 provides a flow of air A to the combustion chamber 11.
  • the fan 17 is assigned to an air inlet port 11A of the combustion chamber 11 or to an air duct 18 providing the air A to the air inlet port 11A.
  • the novel partially-premixed gas burner appliance 10 further comprises an air flow restriction element 19 assigned to the air inlet port 11A of the combustion chamber 11 or to the air duct.
  • the air flow restriction element 19 causes a pressure drop so that the pressure downstream of the air flow restriction element 19 within the combustion chamber 11 is lower than the pressure of the air flow provided by the fan 17 upstream of the air flow restriction element 19.
  • the air flow restriction element 19 can be provided by an orifice plate or by a venturi nozzle.
  • the novel partially-premixed gas burner appliance 10 further comprises a gas modulator 20 providing a flow of gas G to the combustion chamber 11, namely through at least one gas inlet port 11G of the combustion chamber 11.
  • a gas modulator 20 providing a flow of gas G to the combustion chamber 11, namely through at least one gas inlet port 11G of the combustion chamber 11.
  • the combustion chamber 11 may have an individual gas inlet port 11G.
  • the combustion chamber 11 may have multiple gas inlet ports 11G.
  • a gas flow restriction element 40 is assigned to each of the gas inlet ports 11G. Such a gas flow restriction element 40 causes a pressure drop such that the gas pressure upstream of the gas flow restriction element 40 is greater than the pres-sure downstream of the gas flow restriction element 40 within the combustion chamber 11.
  • the gas flow restriction element 40 can be provided by an orifice plate or by a venturi nozzle.
  • a shut off valve 41 is assigned to the gas inlet port 11G providing gas G to the segment 12b of the gas burner rod 12. This makes it possible to selectively open or close the gas inlet port 11G thereby selectively op-erating the segment 12b of the gas burner rod 12.
  • shut off valve 41 the gas inlet port 11G providing gas G to the segment 12a of the gas burner rod 12.
  • the exhaust-gas E flows out of the combustion chamber 11 through an exhaust-gas outlet port 11E of the combustion chamber 11.
  • the gas modulator 20 is provided by a pneumatic gas control valve.
  • Said pneumat-ic gas control valve 20 is configured to be used in fully-premixed gas burner appli-ance.
  • the pneumatic gas control valve 20 comprises a housing 21 providing an inlet gas chamber 21a, an outlet gas chamber 21b and an intermediate gas chamber 21c coupled between the inlet gas chamber 21a, an outlet gas chamber 21b.
  • the pneumatic gas control valve 20 comprises further a main gas valve 22, a safe-ty gas valve 23, a servo gas valve 24 and gas outlet pressure regulator 25.
  • the inlet gas chamber 21a and the inter-mediate gas chamber 21c are fluidically separated from each other.
  • the safe-ty gas valve 23 is opened, the intel gas chamber 21a and the intermediate gas chamber 21c are fluidically connected to each other.
  • the safety gas valve 12 is opened by an actuator 26 against a closing force provide by a spring 36.
  • the safety gas valve 23 is opened, also the servo gas valve 24 becomes opened.
  • Safety gas valve 23 and servo gas valve 24 are both opened by the actuator 26.
  • the intermediate gas chamber 21c and the outlet gas chamber 21c are fluidically connected to each other.
  • the main gas valve 22 comprises a diaphragm 27 and a spring 28.
  • the diaphragm 27 separates the outlet gas chamber 21b from a servo pressure chamber 29.
  • the servo pressure chamber 29 is fluidically connected to the servo gas valve 24.
  • a servo gas pressure being present within the servo gas chamber 29 acts on the second side of the diaphragm 27 of the main gas valve 22 tending to open the main gas valve 22.
  • the servo gas chamber 29 is further fluidically connected to the the gas outlet pressure regulator 25 of the pneumatic gas control valve 20 through a pressure relief valve 38.
  • the gas outlet pressure regulator 25 of the pneumatic gas control valve 20 com-prises a diaphragm 30 and two springs 31, 32.
  • the diaphragm 30 of the gas outlet pressure regulator 25 separates a first chamber 33 of the gas outlet pressure regu-lator 25 from a second chamber 34 of the same.
  • the pressure being present within the first chamber 33 of the gas outlet pressure regulator 25 influences the nominal-value of the gas outlet pressure within the out-let gas chamber 21b of the pneumatic gas control valve 20.
  • the pressure being present within the first chamber 33 of the gas outlet pressure regulator 25 acts on a first side of the diaphragm 30 of the gas outlet pressure regulator 25. Further on, a spring force provided by the spring 31 acts on a first side of the diaphragm 30.
  • the second chamber 34 of the gas outlet pressure regulator 25 is positioned on a second side of said diaphragm 30, wherein the second chamber 34 of the gas out-let pressure regulator 25 is fluidically connected to the gas outlet chamber 11b of the pneumatic gas control valve 20 such that the gas outlet pressure being present within the gas outlet chamber 21b and within the second chamber 34 of the gas outlet pressure regulator 25 acts on the second side of the diaphragm 30 of the gas outlet pressure regulator 25. Further on, a spring force provided by the spring 32 acts on a second side of the diaphragm 30.
  • the gas outlet pressure regulator 25 of the pneumatic gas control valve 20 further comprises presetting unit 35 acting on the first spring 31 to adapt the spring force acting on the first side of said diaphragm 30.
  • presetting unit 35 acting on the first spring 31 to adapt the spring force acting on the first side of said diaphragm 30.
  • the presetting unit 35 can be used to provide an offset or a delta between the pressure on either side of the diaphragm 30 of the gas outlet pressure regulator 25 and as a result an offset or a delta between the generated air pressure and the gas outlet pressure.
  • the pressure relief valve 38 through which the servo gas chamber 29 is fluidically connected to the gas outlet pressure regulator 25 of the pneumatic gas control valve 20 is integrated into the diaphragm 30 of the gas outlet pressure regulator 25.
  • the gas outlet pressure regulator 25 of the pneumatic gas control valve 20, namely the first chamber 33 of the gas outlet pres-sure regulator 25 in which the pressure is present that influences the nominal-value of the gas outlet pressure is permanently fluidically connected to the air inlet port 11A of the combustion chamber 11 or to the air duct providing the air A to the air inlet port 11A upstream of the air flow restriction element 18 such that the gas out-let pressure provided by pneumatic gas control valve 20 depends on to the air pressure provided by the fan 17 upstream of the air flow restriction element 18.
  • the first chamber 33 of the gas outlet pressure regulator 25 of the pneumatic gas control valve is connected to the air inlet port 11A of the combustion chamber 11 or to the air duct 18 through a pipe or duct 37.
  • the pneumatic gas control valve 20 features a positive servo system.
  • the main gas valve 22 is closed by the spring 28 in the normal shut down position and can only be opened when pressure within the servo gas chamber 29 is sufficient to over-come the spring force of the spring 28. This ensures the main gas valve 22 will au-tomatically close in the event of power or gas supply failure.
  • An element of the pneumatic gas control valve 20 is the gas outlet pressure regula-tor 25 which comprises the pressure relief valve 38 integrated in the diaphragm 30 which controls the main gas valve 22.
  • the pressure relief valve 38 opens relieving some of the working pressure within the servo pressure chamber 29. This reduces the force against the main valve spring 28 allowing the main gas valve 22 to close proportionally.
  • the main gas valve 22 limits the gas outlet pressure.
  • the gas outlet pressure is continuously maintained by com-paring the gas outlet pressure being present in the second chamber 34 of the gas outlet pressure regulator 25 with the pressure being present in the first chamber 33 of the gas outlet pressure regulator 25 and adjusting the position of the main gas valve 22 accordingly.
  • the fan 17 is located at the air inlet of the combustion chamber 11.
  • the air pres-sure which is generated by the fan 17 is transferred to first chamber 33 of the gas outlet pressure regulator 25 to generate the outlet gas pressure. This allows to pro-vide a very simple and reliable 1: 1 gas-air control for a partially-premixed gas burn-er appliance.
  • the gas outlet pressure and thereby the gas flow provided by the pneumatic gas control valve 20 is a function of air pressure generated by the fan 17.
  • An offset or a delta between the pressure on either side of the diaphragm 30 of the gas outlet pressure regulator 25 may be provided by the presetting unit 35.
  • the presetting unit 35 At any speed of the fan 17 the pressure drop over air flow restriction 19 equals the pressure drop over the or each gas flow restriction 40. So, the air flow and the gas flow are con-trolled proportionally.
  • presetting unit 35 the gas flow can be influenced to ad-just to desired gas and air ratio setting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
EP21707602.5A 2021-03-04 2021-03-04 Gasbrennervorrichtung mit teilweise vorgemischtem gas Pending EP4302015A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/079048 WO2022183429A1 (en) 2021-03-04 2021-03-04 Partially-premixed gas burner appliance

Publications (1)

Publication Number Publication Date
EP4302015A1 true EP4302015A1 (de) 2024-01-10

Family

ID=74884771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21707602.5A Pending EP4302015A1 (de) 2021-03-04 2021-03-04 Gasbrennervorrichtung mit teilweise vorgemischtem gas

Country Status (4)

Country Link
US (1) US20240142103A1 (de)
EP (1) EP4302015A1 (de)
CN (1) CN116981884A (de)
WO (1) WO2022183429A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024053871A (ja) * 2022-10-04 2024-04-16 株式会社ノーリツ 燃焼装置およびこれを備えた温水装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2247559A1 (de) * 1972-09-28 1974-04-04 Junkers & Co Gas- oder oelbeheiztes geraet, insbesondere wassererhitzer
JPS56151813A (en) * 1980-04-28 1981-11-25 Hitachi Ltd Proportional burning method and apparatus therefor
EP0103303A3 (de) 1982-09-15 1984-06-06 Joh. Vaillant GmbH u. Co. Brennstoffbeheizte Wärmequelle
JPS6091135A (ja) * 1983-10-25 1985-05-22 Matsushita Electric Ind Co Ltd ガス燃焼制御装置
DE3911268A1 (de) 1989-04-07 1990-10-11 Honeywell Bv Regeleinrichtung fuer gasbrenner
CH680749A5 (de) * 1990-04-04 1992-10-30 Landis & Gyr Betriebs Ag
DE4317981A1 (de) * 1993-05-28 1994-12-01 Ranco Inc Gas-Luft-Verhältnisregelvorrichtung für einen Temperaturregelkreis für Gasverbrauchseinrichtungen
EP0644377B1 (de) * 1993-09-16 1996-10-23 Honeywell B.V. Regeleinrichtung für Gasbrenner
DE19639992B4 (de) 1995-09-23 2007-09-13 Vaillant Gmbh Verfahren zum Steuern des Gasdurchsatzes
DE19821853C1 (de) 1998-05-15 1999-07-29 Honeywell Bv Regeleinrichtung für Gasbrenner
US20090197212A1 (en) 2008-02-04 2009-08-06 Maxitrol Company Premix Burner Control System and Method
DE102008024843A1 (de) 2008-05-23 2009-11-26 Honeywell Technologies S.A.R.L. Gasregelgerät
DE102010044762A1 (de) * 2010-09-08 2012-03-08 Honeywell Technologies S.A.R.L. Vorrichtung zur Kalibrierung einer Gasbrennerregelung

Also Published As

Publication number Publication date
WO2022183429A1 (en) 2022-09-09
US20240142103A1 (en) 2024-05-02
CN116981884A (zh) 2023-10-31

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