EP2623865B1 - Gas burner, method for operating the same and multi gas burner system - Google Patents

Gas burner, method for operating the same and multi gas burner system Download PDF

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Publication number
EP2623865B1
EP2623865B1 EP12153790.6A EP12153790A EP2623865B1 EP 2623865 B1 EP2623865 B1 EP 2623865B1 EP 12153790 A EP12153790 A EP 12153790A EP 2623865 B1 EP2623865 B1 EP 2623865B1
Authority
EP
European Patent Office
Prior art keywords
gas
burner
air
fan
backflow
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.)
Active
Application number
EP12153790.6A
Other languages
German (de)
French (fr)
Other versions
EP2623865A1 (en
Inventor
Piet Blaauwwiekel
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.)
Garrett Motion SARL
Original Assignee
Honeywell Technologies 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 Honeywell Technologies SARL filed Critical Honeywell Technologies SARL
Priority to EP12153790.6A priority Critical patent/EP2623865B1/en
Publication of EP2623865A1 publication Critical patent/EP2623865A1/en
Application granted granted Critical
Publication of EP2623865B1 publication Critical patent/EP2623865B1/en
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/187—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/08—Controlling two or more different types of fuel simultaneously

Definitions

  • the present patent application relates to a method for operating a gas burner.
  • EP 1 084 369 B1 and EP 1 179 159 B1 each disclose a method for operating a gas burner.
  • a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber of the gas burner.
  • the gas/air mixture is provided by mixing an air flow provided by an air duct with a gas flow provided by a gas duct using a mixing device.
  • the quantity of the air flow is adjusted by a fan.
  • the defined mixing ratio of the gas/air mixture is controlled by a controller on basis of a signal provided by an electrical or electronic sensor.
  • the electrical or electronic sensor is coupled to the gas duct and to the air duct.
  • the electrical or electronic sensor is coupled to the gas duct and to a reference point.
  • the electrical or electronic sensor is especially designed as a flow-meter.
  • An actual value corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure in the air duct or corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure at the reference point is provided by the electrical or electronic sensor, wherein this actual value is compared with a nominal value.
  • a control variable for a gas valve assigned to the gas duct is generated on basis of the control deviation between the actual value and nominal value, wherein the gas valve is adjusted on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
  • air or exhaust gas might flow back into the burner chamber. This is especially critical when several gas burners of a multi gas burner system are connected to a common exhaust pipe. Backflow of air or exhaust gas can cause deposit of condensate in the fan, in the mixing device or in other components of the gas burner, or even spillage of exhaust gas.
  • gas burners known from prior art are fitted with mechanical devices like flapper valves.
  • the prior art document US 2010/0330512 A1 discloses a multi gas burner system having several gas burners connected to a common exhaust pipe, wherein each gas burner comprises a damper to prevent backflow of exhaust gas.
  • Such mechanical devices like flapper valves or dampers are costly and not always reliable.
  • the method of the present patent application allows the determination of backflow of air or exhaust gas during burner-off phases on basis of a signal provided by the electrical or electronic sensor, whereby this electrical or electronic sensor is used during burner-on phases to control the mixing ratio of gas and air in the gas/air mixture. No, additional devices are need to determine backflow. When backflow of air or exhaust gas is determined during burner-off phases, the fan is turned on. This prevents further backflow.
  • the fan is turned on in such a way that the fan compensates the backflow resulting in a zero flow.
  • This way of operating the fan during burner-off phases is very efficient.
  • An electrical power consumption of the fan at low fan speeds is very low. Further on, this way of operating the fan keeps noises caused by the fan at a minimum.
  • Figure 1 shows a schematic view of a gas burner 10.
  • the gas burner comprises a burner chamber 11 in which combustion of a gas/air mixture takes place during burner-on phases of the gas burner 10.
  • the combustion of the gas/air mixture results into flames 12 monitored by e.g. an ionization sensor 13.
  • the gas/air mixture is provided to the burner chamber 11 of the gas burner 10 by mixing an air flow with a gas flow.
  • a fan 14 sucks in air flowing through an air duct 15 and gas flowing though a gas duct 16.
  • a gas valve 17 for adjusting the gas flow through the gas duct 16 and safety valves 18, 19 are assigned to the gas duct 16.
  • the gas/air mixture having a defined mixing ratio of gas and air is provided to the burner chamber 11 of the gas burner 10.
  • the gas/air mixture is provided by mixing the air flow provided by an air duct 15 with a gas flow provided by a gas duct 16.
  • the air flow and the gas flow become preferably mixed by a mixing device.
  • a mixing device can be designed as a Venturi nozzle (not shown).
  • the quantity of the air flow and thereby the quantity of the gas/air mixture flow is adjusted by the fan 14, namely by the speed of the fan 14.
  • the fan speed can be adjusted by an actuator 22 of the fan 14.
  • the defined mixing ratio of the gas/air mixture is controlled by a controller 20 on basis of a signal provided by an electrical or electronic sensor 23.
  • the electrical or electronic sensor 23 is coupled to the gas duct 16 and to a reference point 26.
  • the electrical or electronic sensor 23 is designed as a flow-meter.
  • An actual value corresponding to a pressure ratio between the gas pressure in the gas duct 16 and the air pressure air pressure at the reference point 26 is provided by the electrical or electronic sensor 23.
  • This actual value is compared by the controller 20 with a nominal value stored in the controller 20.
  • the controller 20 generates a control variable for the gas valve 17, namely for an actuator 21 of the gas valve 17, on basis of the control deviation between the actual value provided by the electrical or electronic sensor 23 and the nominal value stored in the controller 20.
  • the gas valve position of the gas valve 17 is adjusted by the actuator 21 of the same on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
  • Exhaust gas resulting form the combustion of the gas/air mixture within the burner chamber 11 during burner-on phases of the gas burner 10 is leaving the burner chamber 11 through an exhaust outlet 24 of the burner chamber 11.
  • the exhaust gas flows than into an exhaust pipe 25.
  • the actual value provided by the electrical or electronic sensor 23 is used to determine backflow, namely backflow of exhaust gas or air.
  • the electrical or electronic sensor 23 provides the actual value to the controller 20 and the controller 20 determines from this actual value and a nominal value valid for burner-off phases the presence of backflow of exhaust gas or air.
  • the fan 14 of the gas burner 10 When backflow is determined during burner-off phases, the fan 14 of the gas burner 10 is turned on.
  • the controller 20 generates a signal for the actuator 22 of the fan 14 in order to turn the same on during burner-off phases when back flow was detected.
  • the fan 14 is turned on in such a way that the fan 14 provides a flow through the burner chamber 11 opposite to the direction of the backflow.
  • the fan 14 is turned on in such a way that the fan 14 merely compensates the backflow resulting in a zero flow through the burner chamber 11.
  • This way of operating the fan 14 during burner-off phases is energy efficient. An electrical power consumption of the fan at a low fan speed is very low. Further on, this way of operating the fan 14 keeps noises caused by the fan 14 at a minimum.
  • Figure 2 shows a multi gas burner system having at least two gas burners 10.
  • the gas burners 10 are connected to a common exhaust pipe 25.
  • At least one of the gas burners 10, preferably all gas burners 10, of the multi gas burner system comprise the functionality as described above.
  • the detection of backflow is particularly of advantage in such a multi gas burner system. In such multi gas burner system the risk of backflow of exhaust gas is significantly higher than in a single gas burner application. By turning on the fan of the gas burner 10 for which backflow has been detected, further backflow into the same can be avoided.
  • the present patent application avoids the use of mechanical devices like flapper valves or dampers to stop backflow.

Landscapes

  • 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)

Description

  • The present patent application relates to a method for operating a gas burner.
  • EP 1 084 369 B1 and EP 1 179 159 B1 each disclose a method for operating a gas burner. According to this prior art documents, during burner-on phases of the respective gas burner a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber of the gas burner. The gas/air mixture is provided by mixing an air flow provided by an air duct with a gas flow provided by a gas duct using a mixing device. The quantity of the air flow is adjusted by a fan. The defined mixing ratio of the gas/air mixture is controlled by a controller on basis of a signal provided by an electrical or electronic sensor. According to EP 1 084 369 B1 , the electrical or electronic sensor is coupled to the gas duct and to the air duct. According to EP 1 179 159 B1 , the electrical or electronic sensor is coupled to the gas duct and to a reference point. The electrical or electronic sensor is especially designed as a flow-meter. An actual value corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure in the air duct or corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure at the reference point is provided by the electrical or electronic sensor, wherein this actual value is compared with a nominal value. A control variable for a gas valve assigned to the gas duct is generated on basis of the control deviation between the actual value and nominal value, wherein the gas valve is adjusted on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
  • During burner-on phases of a gas burner exhaust gas resulting form the combustion of the gas/air mixture within the burner chamber of the gas burner is flowing into an exhaust pipe.
  • During burner-off phases of a gas burner under certain conditions air or exhaust gas might flow back into the burner chamber. This is especially critical when several gas burners of a multi gas burner system are connected to a common exhaust pipe. Backflow of air or exhaust gas can cause deposit of condensate in the fan, in the mixing device or in other components of the gas burner, or even spillage of exhaust gas.
  • In order to avoid such a backflow of air or exhaust gas, gas burners known from prior art are fitted with mechanical devices like flapper valves. The prior art document US 2010/0330512 A1 discloses a multi gas burner system having several gas burners connected to a common exhaust pipe, wherein each gas burner comprises a damper to prevent backflow of exhaust gas. Such mechanical devices like flapper valves or dampers are costly and not always reliable.
  • AT 510 002 A4 and DE 10 2005 034 758 B3 both disclose Other prior art related to burner-on phases of a gas burner.
  • Against this background, a novel method for operating a gas burner is provided.
  • The method for operating a gas burner is defined in the claim 1.
  • The method of the present patent application allows the determination of backflow of air or exhaust gas during burner-off phases on basis of a signal provided by the electrical or electronic sensor, whereby this electrical or electronic sensor is used during burner-on phases to control the mixing ratio of gas and air in the gas/air mixture. No, additional devices are need to determine backflow. When backflow of air or exhaust gas is determined during burner-off phases, the fan is turned on. This prevents further backflow.
  • According to a preferred embodiment of the invention, the fan is turned on in such a way that the fan compensates the backflow resulting in a zero flow. This way of operating the fan during burner-off phases is very efficient. An electrical power consumption of the fan at low fan speeds is very low. Further on, this way of operating the fan keeps noises caused by the fan at a minimum.
  • Preferred developments of the invention are provided by the dependent claims and the description which follows. Exemplary embodiments are explained in more detail on the basis of the drawing, in which:
    • Figure 1
    shows a schematic view of a gas burner; and
    Figure 2
    shows a schematic view of a multi gas burner system.
  • Figure 1 shows a schematic view of a gas burner 10. The gas burner comprises a burner chamber 11 in which combustion of a gas/air mixture takes place during burner-on phases of the gas burner 10. The combustion of the gas/air mixture results into flames 12 monitored by e.g. an ionization sensor 13.
  • The gas/air mixture is provided to the burner chamber 11 of the gas burner 10 by mixing an air flow with a gas flow. A fan 14 sucks in air flowing through an air duct 15 and gas flowing though a gas duct 16. A gas valve 17 for adjusting the gas flow through the gas duct 16 and safety valves 18, 19 are assigned to the gas duct 16.
  • The gas/air mixture having a defined mixing ratio of gas and air is provided to the burner chamber 11 of the gas burner 10. The gas/air mixture is provided by mixing the air flow provided by an air duct 15 with a gas flow provided by a gas duct 16.
  • The air flow and the gas flow become preferably mixed by a mixing device. Such a mixing device can be designed as a Venturi nozzle (not shown).
  • The quantity of the air flow and thereby the quantity of the gas/air mixture flow is adjusted by the fan 14, namely by the speed of the fan 14. The fan speed can be adjusted by an actuator 22 of the fan 14.
  • The defined mixing ratio of the gas/air mixture is controlled by a controller 20 on basis of a signal provided by an electrical or electronic sensor 23. In the shown embodiment, the electrical or electronic sensor 23 is coupled to the gas duct 16 and to a reference point 26. The electrical or electronic sensor 23 is designed as a flow-meter.
  • An actual value corresponding to a pressure ratio between the gas pressure in the gas duct 16 and the air pressure air pressure at the reference point 26 is provided by the electrical or electronic sensor 23. This actual value is compared by the controller 20 with a nominal value stored in the controller 20. The controller 20 generates a control variable for the gas valve 17, namely for an actuator 21 of the gas valve 17, on basis of the control deviation between the actual value provided by the electrical or electronic sensor 23 and the nominal value stored in the controller 20. The gas valve position of the gas valve 17 is adjusted by the actuator 21 of the same on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
  • Exhaust gas resulting form the combustion of the gas/air mixture within the burner chamber 11 during burner-on phases of the gas burner 10 is leaving the burner chamber 11 through an exhaust outlet 24 of the burner chamber 11. The exhaust gas flows than into an exhaust pipe 25.
  • During burner-off phases the actual value provided by the electrical or electronic sensor 23 is used to determine backflow, namely backflow of exhaust gas or air.
  • During burner-off phases the electrical or electronic sensor 23 provides the actual value to the controller 20 and the controller 20 determines from this actual value and a nominal value valid for burner-off phases the presence of backflow of exhaust gas or air.
  • When backflow is determined during burner-off phases, the fan 14 of the gas burner 10 is turned on. The controller 20 generates a signal for the actuator 22 of the fan 14 in order to turn the same on during burner-off phases when back flow was detected.
  • According to a first embodiment, the fan 14 is turned on in such a way that the fan 14 provides a flow through the burner chamber 11 opposite to the direction of the backflow.
  • According to a second embodiment, the fan 14 is turned on in such a way that the fan 14 merely compensates the backflow resulting in a zero flow through the burner chamber 11. This way of operating the fan 14 during burner-off phases is energy efficient. An electrical power consumption of the fan at a low fan speed is very low. Further on, this way of operating the fan 14 keeps noises caused by the fan 14 at a minimum.
  • Figure 2 shows a multi gas burner system having at least two gas burners 10. The gas burners 10 are connected to a common exhaust pipe 25. At least one of the gas burners 10, preferably all gas burners 10, of the multi gas burner system comprise the functionality as described above. The detection of backflow is particularly of advantage in such a multi gas burner system. In such multi gas burner system the risk of backflow of exhaust gas is significantly higher than in a single gas burner application. By turning on the fan of the gas burner 10 for which backflow has been detected, further backflow into the same can be avoided.
  • The present patent application avoids the use of mechanical devices like flapper valves or dampers to stop backflow.
    • List of reference signs
    • 10
    gas burner
    11
    burner chamber
    12
    flame
    13
    ionization sensor
    14
    fan
    15
    air duct
    16
    gas duct
    17
    regulating valve
    18
    safety valve
    19
    safety valve
    20
    controller
    21
    actuator
    22
    actuator
    23
    sensor
    24
    exhaust outlet
    25
    exhaust pipe
    26
    reference point

Claims (5)

  1. Method for operating a gas burner (10), wherein during burner-on phases a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber (11) of the gas burner (10) for combusting the gas/air mixture with the burner chamber (11), wherein the gas/air mixture is provided by mixing an air flow provided by an air duct (15) with a gas flow provided by a gas duct (16), and wherein the defined mixing ratio of the gas/air mixture is controlled by comparing an actual value provided by an electrical or electronic sensor (23) coupled to the gas duct (16) with a nominal value and by generating a control variable for a gas valve (17) assigned to the gas duct (16) on basis of the control deviation between the actual value and the nominal value, characterized in that during burner-off phases the actual value provided by the electrical or electronic sensor (23) is used to determine backflow, and that when backflow is determined during burner-off phases, a fan (14) of the gas burner (10) is turned on.
  2. Method as claimed in claim 1, characterized in that during burner-off phases the actual value provided by the electrical or electronic sensor (23) is used to determine backflow of exhaust gas or air.
  3. Method as claimed in claim 1 or 2, characterized in that the fan (14) is turned on in such a way that the fan (14) provides a flow opposite to the direction of the backflow.
  4. Method as claimed claim 1 or 2, characterized in that the fan (14) is turned on in such a way that the fan (14) compensates the backflow resulting in a zero flow.
  5. Method as claimed in one of claims 1 to 4, characterized in that the gas burner (10) is part of a multi gas burner system having several gas burners (10) being connected to a common exhaust pipe (25).
EP12153790.6A 2012-02-03 2012-02-03 Gas burner, method for operating the same and multi gas burner system Active EP2623865B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12153790.6A EP2623865B1 (en) 2012-02-03 2012-02-03 Gas burner, method for operating the same and multi gas burner system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12153790.6A EP2623865B1 (en) 2012-02-03 2012-02-03 Gas burner, method for operating the same and multi gas burner system

Publications (2)

Publication Number Publication Date
EP2623865A1 EP2623865A1 (en) 2013-08-07
EP2623865B1 true EP2623865B1 (en) 2020-04-08

Family

ID=45655373

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EP12153790.6A Active EP2623865B1 (en) 2012-02-03 2012-02-03 Gas burner, method for operating the same and multi gas burner system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3763997A1 (en) 2019-07-11 2021-01-13 Viessmann Werke GmbH & Co. KG Method for operating a fan burner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2966354B1 (en) * 2014-07-08 2017-11-29 Honeywell Technologies Sarl Method for operating a gas burner
JP7229004B2 (en) * 2018-12-13 2023-02-27 大阪瓦斯株式会社 Heat source machine with fan

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824521B4 (en) * 1998-06-02 2004-12-23 Honeywell B.V. Control device for gas burners
DE19922226C1 (en) 1999-05-14 2000-11-30 Honeywell Bv Control device for gas burners
DE102005034758B3 (en) * 2005-07-21 2006-08-10 Honeywell Technologies S.A.R.L. Method for operating a gas burner comprises actuating one or each gas valve for adjusting the gas stream through a gas line with a running fan depending on a signal from a sensor
KR101000724B1 (en) 2008-05-20 2010-12-14 주식회사 경동네트웍 Multi-boiler and control method thereof for preventing back flow of exhaust gas
AT510002B1 (en) * 2010-12-20 2012-01-15 Vaillant Group Austria Gmbh METHOD FOR REGULATING A GAS / AIR MIXTURE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3763997A1 (en) 2019-07-11 2021-01-13 Viessmann Werke GmbH & Co. KG Method for operating a fan burner
DE102019118764A1 (en) * 2019-07-11 2021-01-14 Viessmann Werke Gmbh & Co Kg Method for operating a forced draft burner

Also Published As

Publication number Publication date
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