EP0359144A2 - Gas burner - Google Patents

Gas burner Download PDF

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Publication number
EP0359144A2
EP0359144A2 EP89116638A EP89116638A EP0359144A2 EP 0359144 A2 EP0359144 A2 EP 0359144A2 EP 89116638 A EP89116638 A EP 89116638A EP 89116638 A EP89116638 A EP 89116638A EP 0359144 A2 EP0359144 A2 EP 0359144A2
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EP
European Patent Office
Prior art keywords
combustion chamber
sensor
burner
gas
gas burner
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.)
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Application number
EP89116638A
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German (de)
French (fr)
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EP0359144A3 (en
Inventor
Michael Wittler
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.)
Vaillant GmbH
Original Assignee
Joh Vaillant GmbH and Co
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 Joh Vaillant GmbH and Co filed Critical Joh Vaillant GmbH and Co
Publication of EP0359144A2 publication Critical patent/EP0359144A2/en
Publication of EP0359144A3 publication Critical patent/EP0359144A3/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M11/00—Safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply

Definitions

  • the invention relates to a gas burner with a closed combustion chamber supplied with fresh air by means of a blower.
  • the air in the combustion chamber should not contain any fuel gas when the burner is started up in order to reliably rule out the ignition of an explosive mixture which could form, for example, due to a leak in the gas supply valve.
  • the object of the invention is to save the time required for such flushing.
  • a sensor responsive to the presence of combustible gases is arranged according to the invention within the combustion chamber.
  • Such a sensor can then be assigned a circuit which blocks the gas supply to the burner and / or the ignition of the burner when a limit value of the fuel gas content in the air of the combustion chamber is exceeded.
  • the senor After starting up the burner, the sensor should not have any effect on the function of the burner because its signals - depending on the composition of the gas-air mixture fed to the burner - are not clear. It is therefore recommended to use the sensor permanently switch off the burner operation.
  • TGS 813 and TGS 816 from Figaro are suitable, for example.
  • the sensor used is cross-sensitive to carbon monoxide, it is advantageous not to delay the switch-off of the fan compared to the point in time at which the gas supply to the burner is switched off, but until the sensor signals a correct composition of the combustion chamber atmosphere.
  • the housing 1 of the combustion chamber 2 encloses one or more approximately tubular burners 3 with gas outlet openings 4 and the heat exchanger 5 arranged above the combustion chamber 2, to which a heat exchange medium, such as water, is supplied via line 6 and removed via line 7.
  • a heat exchange medium such as water
  • the housing 1 has a fresh air inlet 8 on its underside and an exhaust gas outlet 9 on its upper side, to which the blower 10 connects with the exhaust gas duct 11.
  • the gas burner operation is controlled by means of the circuit 12, to which the sensor 13 located in the combustion chamber 2 is connected via the signal line 14, the ignition electrode 15 via the electrical line 16 and the gas supply valve 18 arranged in the gas supply line 17 by means of a control line 19.
  • the motor of the blower 10 can also be connected to this circuit 12 via an electrical line 20, provided that this blower 10 is to be used for pre-purging before starting the burner 3 or for rinsing the combustion chamber 2 after the burner 3 has been switched off.
  • a sensor 13 responsive to combustible gases is arranged above the burner in the combustion chamber 2, preferably below the heat exchanger 5.
  • the atmosphere 13 in the combustion chamber 2 is first checked by the sensor 13. If this check shows that the limit value for the proportion of combustible gases in the combustion chamber 2 has not been exceeded, the circuit 12 immediately releases the ignition and gas supply.

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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)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Control Of Combustion (AREA)

Abstract

A gas burner having a closed combustion chamber that is supplied with fresh air by means of a fan, and having a sensor (13), which responds to the presence of combustible gases and is arranged inside said combustion chamber (2).

Description

Die Erfindung betrifft einen Gasbrenner mit einer ge­schlossenen, mittels eines Gebläses mit Frischluft ver­sorgter Brennkammer.The invention relates to a gas burner with a closed combustion chamber supplied with fresh air by means of a blower.

Bei solchen Gasbrennern soll die in der Brennkammer be­findliche Luft bei der Inbetriebnahme des Brenners kein Brenngas enthalten, um die Zündung eines explosiven Gemi­sches, das sich beispielsweise durch eine Undichtheit des Gaszufuhrventiles bilden könnte, mit Sicherheit auszuschließen.In the case of such gas burners, the air in the combustion chamber should not contain any fuel gas when the burner is started up in order to reliably rule out the ignition of an explosive mixture which could form, for example, due to a leak in the gas supply valve.

Um das Zustandekommen eines solchen explosiven Gemisches durch einen Austausch der darin befindlichen Luft zu ver­hindern, mußte die Brennkammer vor Inbetriebnahme des Brenners zeitaufwendig gespült werden, wodurch sich die Inbetriebnahme verzögerte.In order to prevent the occurrence of such an explosive mixture by exchanging the air in it, the combustion chamber had to be flushed before the burner was put into operation, which delayed the start-up.

Aufgabe der Erfindung ist es, den für eine solche Spülung erforderlichen Zeitaufwand einzusparen.The object of the invention is to save the time required for such flushing.

Zur Lösung dieser Aufgabe wird erfindungsgemäß innerhalb der Brennkammer ein auf das Vorhandensein brennbarer Gase ansprechender Sensor angeordnet.To achieve this object, a sensor responsive to the presence of combustible gases is arranged according to the invention within the combustion chamber.

Einem solchen Sensor kann dann eine Schaltung zugeordnet sein, die bei Überschreiten eines Grenzwertes des Brenn­gasanteiles in der Luft der Brennkammer die Gaszufuhr zum Brenner und/oder die Zündung des Brenners blockiert.Such a sensor can then be assigned a circuit which blocks the gas supply to the burner and / or the ignition of the burner when a limit value of the fuel gas content in the air of the combustion chamber is exceeded.

Darüber hinaus ist es im Rahmen der Erfindung auch mög­lich, dem Sensor eine Schaltung zuzuordnen, die bei Über­schreiten des Grenzwertes vor Freigabe der Gaszufuhr und/oder Zündung eine Spülung der Brennkammer und einen Austausch der in ihr enthaltenen Luft mittels des Geblä­ses einleitet.In addition, it is also possible within the scope of the invention to assign a circuit to the sensor which, if the limit value is exceeded before the gas supply and / or ignition is released, initiates purging of the combustion chamber and an exchange of the air contained therein by means of the fan.

Eine solche Spülung wird also in diesem Fall nur dann er­folgen brauchen, wenn sie sich als erforderlich erweist.In this case, such a rinse will only need to be carried out if it proves to be necessary.

Nach Inbetriebnahme des Brenners soll der Sensor keine Auswirkungen auf die Funktion des Brenners haben, weil seine Signale - je nach der Zusammensetzung des dem Bren­ner zugeführten Gas-Luft-Gemisches - nicht eindeutig sind. Es empfiehlt sich deshalb, den Sensor auf die Dauer des Brennerbetriebes abzuschalten.After starting up the burner, the sensor should not have any effect on the function of the burner because its signals - depending on the composition of the gas-air mixture fed to the burner - are not clear. It is therefore recommended to use the sensor permanently switch off the burner operation.

Um eine Blockierung des Brenners durch nicht verbrannte Anteile im Abgas zu vermeiden, ist es vorteilhaft, die Abschaltung des Gebläses gegenüber dem Zeitpunkt der Aus­schaltung der Gaszufuhr zum Brenner um eine vorbestimmte Zeitspanne zu verzögertn, nämlich so lange, bis der Sen­sor eine ordnungsgemäße Zusammensetzung der Brennkammer­atmosphäre signalisiert.In order to prevent the burner from being blocked by unburned components in the exhaust gas, it is advantageous to delay the switch-off of the fan by a predetermined period of time compared to the time the gas supply to the burner is switched off, namely until the sensor detects a correct composition of the combustion chamber atmosphere signals.

Für den Sensor ist die Verwendung eines Metalloxidhalb­leiters empfehlenswert, weil solche Sensoren eine hohe Sensibilität gegenüber reduzierenden Gasen aufweisen und befähigt sind, solche Gase, wie Erdga, Propan, Butan usw., gut zu erkennen. Geeignet sind zum Beispiel die Sensoren für brennbare Gase TGS 813 und TGS 816 der Firma Figaro.The use of a metal oxide semiconductor is recommended for the sensor because such sensors have a high sensitivity to reducing gases and are capable of easily recognizing such gases as Erdga, propane, butane, etc. The sensors for combustible gases TGS 813 and TGS 816 from Figaro are suitable, for example.

Wenn der verwendete Sensor querempfindlich gegenüber Koh­lenmonoxid ist, ist es vorteilhaft, die Abschaltung des Gebläses gegenüber dem Zeitpunkt der Ausschaltung der Gaszufuhr zum Brenner nicht um eine vorbestimmte Zeit­spanne zu verzögern, sondern so lange, bis der Sensor ei­ne ordnungsgemäße Zusammensetzung der Brennkammeratmo­sphäre signalisiert.If the sensor used is cross-sensitive to carbon monoxide, it is advantageous not to delay the switch-off of the fan compared to the point in time at which the gas supply to the burner is switched off, but until the sensor signals a correct composition of the combustion chamber atmosphere.

Ein Ausführungsbeispiel eines mit einem erfindungsgemäßen Gasbrenner ausgestatteten Heizgerätes ist in der einzigen Zeichnungsfigur schematisch dargestellt.An embodiment of a heater equipped with a gas burner according to the invention is in the only one Figure shown schematically.

Das Gehäuse 1 der Brennkammer 2 umschließt einen oder mehrere etwa rohrförmige Brenner 3 mit Gasaustrittsöff­nungen 4 und den oberhalb der Brennkammer 2 angeordneten Wärmetauscher 5, dem ein Wärmetauschmedium, wie Wasser, über die Leitung 6 zugeführt und über die Leitung 7 ent­nommen wird.The housing 1 of the combustion chamber 2 encloses one or more approximately tubular burners 3 with gas outlet openings 4 and the heat exchanger 5 arranged above the combustion chamber 2, to which a heat exchange medium, such as water, is supplied via line 6 and removed via line 7.

Das Gehäuse 1 weist an seiner Unterseite einen Frisch­lufteinlaß 8 und an seiner Oberseite einen Abgasauslaß 9 auf, an den das Gebläse 10 mit der Abgasführung 11 an­schließt.The housing 1 has a fresh air inlet 8 on its underside and an exhaust gas outlet 9 on its upper side, to which the blower 10 connects with the exhaust gas duct 11.

Die Steuerung des Gasbrennerbetriebes erfolgt mittels der Schaltung 12, an die der in der Brennkammer 2 befindliche Sensor 13 über die Signalleitung 14, die Zündelektrode 15 über die elektrische Leitung 16 und das in der Gaszufuhr­leitung 17 angeordnete Gaszufuhrventil 18 mittels einer Steuerleitung 19 angeschlossen sind. Gegebenenfalls kann auch der Motor des Gebläses 10 über eine elektrische Lei­tung 20 an diese Schaltung 12 angeschlossen sein, sofern dieses Gebläse 10 vor Inbetriebnahme des Brenners 3 zu einer Vorspülung oder nach Abschalten des Brenners 3 zu einer Nachspülung der Brennkammer 2 herangezogen werden soll.The gas burner operation is controlled by means of the circuit 12, to which the sensor 13 located in the combustion chamber 2 is connected via the signal line 14, the ignition electrode 15 via the electrical line 16 and the gas supply valve 18 arranged in the gas supply line 17 by means of a control line 19. If necessary, the motor of the blower 10 can also be connected to this circuit 12 via an electrical line 20, provided that this blower 10 is to be used for pre-purging before starting the burner 3 or for rinsing the combustion chamber 2 after the burner 3 has been switched off.

Es ist oberhalb des Brenners in der Brennkammer 2 ein auf brennbare Gase ansprechender Sensor 13 angeordnet, vor­zugsweise unterhalb des Wärmetauschers 5.A sensor 13 responsive to combustible gases is arranged above the burner in the combustion chamber 2, preferably below the heat exchanger 5.

Die Funktion des Gasbrenners ergibt sich aus dieser Ge­staltung wie folgt:The function of the gas burner results from this design as follows:

Beim Einschalten des Gasbrenners erfolgt zunächst eine Überprüfung der in der Brennkammer 2 herrschenden Atmo­sphäre durch den Sensor 13. Ergibt diese Prüfung, daß der Grenzwert für den Anteil brennbarer Gase in der Brennkam­mer 2 nicht überschritten ist, gibt die Schaltung 12 Zün­dung und Gaszufuhr unverzüglich frei.When the gas burner is switched on, the atmosphere 13 in the combustion chamber 2 is first checked by the sensor 13. If this check shows that the limit value for the proportion of combustible gases in the combustion chamber 2 has not been exceeded, the circuit 12 immediately releases the ignition and gas supply.

Gibt jedoch der Sensor 13 der Schaltung 12 ein Warnsig­nal, werden Gaszufuhr 17, 18 und Zündung 15, 16 blok­kiert; gegebenenfalls wird eine Vorspülung der Brennkam­mer 2 durch das Gebläse 10 veranlaßt, bis der Sensor 13 eine korrekte Zusammensetzung der Brennkammeratmosphäre signalisiert.However, if sensor 13 gives circuit 12 a warning signal, gas supply 17, 18 and ignition 15, 16 are blocked; if necessary, the fan 10 causes the combustion chamber 2 to be pre-purged until the sensor 13 signals a correct composition of the combustion chamber atmosphere.

Claims (6)

1. Gasbrenner mit einer geschlossenen, mittels ei­nes Gebläses mit Frischluft versorgten Brennkam­mer, gekennzeichnet durch einen innerhalb dieser Brennkammer (2) angeordneten, auf das Vorhanden­sein brennbarer Gase ansprechenden Sensor (13).1. Gas burner with a closed combustion chamber supplied with fresh air by means of a blower, characterized by a sensor (13) arranged within this combustion chamber (2) and responsive to the presence of combustible gases. 2. Gasbrenner nach Anspruch 1, dadurch gekennzeich­net, daß dem Sensor (13) eine Schaltung (12) zu­geordnet ist, die bei Überschreiten eines Grenz­wertes des Brenngasanteiles in der Luft der Brennkammer (2) die Gaszufuhr (17, 18) und/oder die Zündung (15, 16) des Brenners (3) blockiert.2. Gas burner according to claim 1, characterized in that the sensor (13) is assigned a circuit (12) which, when a limit value of the fuel gas content in the air of the combustion chamber (2) is exceeded, the gas supply (17, 18) and / or Ignition (15, 16) of the burner (3) blocked. 3. Gasbrenner nach Anspruch 1 oder 2, dadurch ge­kennzeichnet, daß dem Sensor (13) eine Schaltung zugeordnet ist, die bei Überschreiten eines Grenzwertes des Brenngasanteiles in der Luft der Brennkammer (2) eine Spülung der Brennkammer (2) und einen Austausch der in ihr enthaltenen Luft mittels des Gebläses (10, 20) einleitet.3. Gas burner according to claim 1 or 2, characterized in that the sensor (13) is assigned a circuit which, when a limit value of the fuel gas content in the air is exceeded Combustion chamber (2) initiates purging of the combustion chamber (2) and an exchange of the air contained therein by means of the fan (10, 20). 4. Gasbrenner nach Anspruch 3, dadurch gekennzeich­net, daß die Abschaltung des Gebläses (10) ge­genüber dem Zeitpunkt der Abschaltung der Gas­zufuhr (17, 18) zum Brenner (3) entsprechend dem Signal des Sensors (13) verzögert ist.4. Gas burner according to claim 3, characterized in that the switching off of the fan (10) compared to the time of switching off the gas supply (17, 18) to the burner (3) is delayed in accordance with the signal from the sensor (13). 5. Gasbrenner nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß der Sensor (13) wäh­rend der Dauer des Brennerbetriebes abschaltbar ist.5. Gas burner according to one of claims 1 to 4, characterized in that the sensor (13) can be switched off for the duration of the burner operation. 6. Gasbrenner nach einem der Ansprüche 1 bis 5, ge­kennzeichnet durch die Verwendung eines Metall­oxidhalbleiters als Sensor (13).6. Gas burner according to one of claims 1 to 5, characterized by the use of a metal oxide semiconductor as a sensor (13).
EP19890116638 1988-09-13 1989-09-08 Gas burner Withdrawn EP0359144A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831171 1988-09-13
DE3831171 1988-09-13

Publications (2)

Publication Number Publication Date
EP0359144A2 true EP0359144A2 (en) 1990-03-21
EP0359144A3 EP0359144A3 (en) 1991-04-10

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EP19890116638 Withdrawn EP0359144A3 (en) 1988-09-13 1989-09-08 Gas burner

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672666A1 (en) * 1991-02-11 1992-08-14 Brisach Rene Cheminees Sa Device for extracting gas combustion products with a safety device
GB2318862A (en) * 1996-10-29 1998-05-06 Daewoo Electronics Co Ltd Gas boiler ignition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672188A (en) * 1949-11-12 1954-03-16 Gen Motors Corp Burner safety control system
CH351700A (en) * 1956-12-10 1961-01-31 Prvni Brnenska Strojirna Safety device in a gas-fired furnace
GB1394364A (en) * 1971-06-15 1975-05-14 Energy Equipment Co Ltd Burrow Hydrocarbon fuel combustion appliances and safety devices therefor
JPS57202427A (en) * 1981-06-05 1982-12-11 Omron Tateisi Electronics Co Combustion controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672188A (en) * 1949-11-12 1954-03-16 Gen Motors Corp Burner safety control system
CH351700A (en) * 1956-12-10 1961-01-31 Prvni Brnenska Strojirna Safety device in a gas-fired furnace
GB1394364A (en) * 1971-06-15 1975-05-14 Energy Equipment Co Ltd Burrow Hydrocarbon fuel combustion appliances and safety devices therefor
JPS57202427A (en) * 1981-06-05 1982-12-11 Omron Tateisi Electronics Co Combustion controller

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 55 (M-198)(1200) 5 März 1983, & JP-A-57 202427 (TATSEISHI DENKI KK) 11 Dezember 1982, *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672666A1 (en) * 1991-02-11 1992-08-14 Brisach Rene Cheminees Sa Device for extracting gas combustion products with a safety device
GB2318862A (en) * 1996-10-29 1998-05-06 Daewoo Electronics Co Ltd Gas boiler ignition
US5902098A (en) * 1996-10-29 1999-05-11 Daewoo Electronics Co., Ltd. Method for controlling an ignition for a gas boiler
GB2318862B (en) * 1996-10-29 1999-10-06 Daewoo Electronics Co Ltd Method for controlling an igniting operation for a gas boiler

Also Published As

Publication number Publication date
EP0359144A3 (en) 1991-04-10

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