EP2623865B1 - Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples - Google Patents

Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples 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
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German (de)
English (en)
Other versions
EP2623865A1 (fr
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
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Publication date
Application filed by Honeywell Technologies SARL filed Critical Honeywell Technologies SARL
Priority to EP12153790.6A priority Critical patent/EP2623865B1/fr
Publication of EP2623865A1 publication Critical patent/EP2623865A1/fr
Application granted granted Critical
Publication of EP2623865B1 publication Critical patent/EP2623865B1/fr
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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)

Claims (5)

  1. Procédé de fonctionnement d'un brûleur à gaz (10), dans lequel, pendant des phases de brûleur allumé, un mélange gaz/air présentant un rapport de mélange défini de gaz et d'air est introduit dans une chambre de brûleur (11) du brûleur à gaz (10) dans le but de brûler le mélange gaz/air dans la chambre de brûleur (11), dans lequel le mélange gaz/air est réalisé en mélangeant un écoulement d'air fourni par un conduit d'air (15) avec un écoulement de gaz fourni par un conduit de gaz (16), et dans lequel le rapport de mélange défini du mélange gaz/air est commandé en comparant une valeur réelle fournie par un capteur électrique ou électronique (23) couplé au conduit de gaz (16) avec une valeur nominale, et en générant une variable de commande pour un robinet de gaz (17) associé au conduit de gaz (16) sur la base de l'écart de commande entre la valeur réelle et la valeur nominale, caractérisé en ce, que pendant des phases de brûleur éteint, la valeur réelle fournie par le capteur électrique ou électronique (23) est utilisée pour déterminer le reflux, et en ce que lorsqu'un reflux est déterminé pendant des phases de brûleur éteint, un ventilateur (14) du brûleur à gaz (10) est activé.
  2. Procédé selon la revendication 1, caractérisé en ce que, pendant des phases de brûleur éteint, la valeur réelle fournie par le capteur électrique ou électronique (23) est utilisée pour déterminer le reflux de gaz d'échappement ou d'air.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le ventilateur (14) est activé d'une manière telle que le ventilateur (14) génère un écoulement opposé à la direction du reflux.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que le ventilateur (14) est activé d'une manière telle que le ventilateur (14) compense le reflux afin de résulter en un débit nul.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le brûleur à gaz (10) fait partie d'un système de brûleurs à gaz multiples comprenant plusieurs brûleurs à gaz (10) qui sont connectés à un tuyau d'échappement commun (25).
EP12153790.6A 2012-02-03 2012-02-03 Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples Active EP2623865B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12153790.6A EP2623865B1 (fr) 2012-02-03 2012-02-03 Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12153790.6A EP2623865B1 (fr) 2012-02-03 2012-02-03 Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples

Publications (2)

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EP2623865A1 EP2623865A1 (fr) 2013-08-07
EP2623865B1 true EP2623865B1 (fr) 2020-04-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3763997A1 (fr) 2019-07-11 2021-01-13 Viessmann Werke GmbH & Co. KG Procédé de fonctionnement d'un brûleur à ventilateur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2966354B1 (fr) * 2014-07-08 2017-11-29 Honeywell Technologies Sarl Procédé de fonctionnement d'un brûleur à gaz
JP7229004B2 (ja) * 2018-12-13 2023-02-27 大阪瓦斯株式会社 ファンを有する熱源機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824521B4 (de) * 1998-06-02 2004-12-23 Honeywell B.V. Regeleinrichtung für Gasbrenner
DE19922226C1 (de) 1999-05-14 2000-11-30 Honeywell Bv Regeleinrichtung für Gasbrenner
DE102005034758B3 (de) * 2005-07-21 2006-08-10 Honeywell Technologies S.A.R.L. Verfahren zum Betreiben eines Gasbrenners
KR101000724B1 (ko) 2008-05-20 2010-12-14 주식회사 경동네트웍 배기가스 역류를 방지하기 위한 멀티보일러 및 그 제어방법
AT510002B1 (de) * 2010-12-20 2012-01-15 Vaillant Group Austria Gmbh Verfahren zur regelung eines gas-/luftgemisches

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 (fr) 2019-07-11 2021-01-13 Viessmann Werke GmbH & Co. KG Procédé de fonctionnement d'un brûleur à ventilateur
DE102019118764A1 (de) * 2019-07-11 2021-01-14 Viessmann Werke Gmbh & Co Kg Verfahren zum Betrieb eines Gebläsebrenners

Also Published As

Publication number Publication date
EP2623865A1 (fr) 2013-08-07

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