EP2354657B1 - Method for operating a gas burner - Google Patents

Method for operating a gas burner Download PDF

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Publication number
EP2354657B1
EP2354657B1 EP11000080.9A EP11000080A EP2354657B1 EP 2354657 B1 EP2354657 B1 EP 2354657B1 EP 11000080 A EP11000080 A EP 11000080A EP 2354657 B1 EP2354657 B1 EP 2354657B1
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EP
European Patent Office
Prior art keywords
gas
gas burner
combustion
air mixture
ionization
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EP11000080.9A
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German (de)
French (fr)
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EP2354657A3 (en
EP2354657A2 (en
Inventor
Wim Munsterhuis
Gerwin Langius
Frank Van Prooijen
Geert S. Meyerink
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Garrett Motion SARL
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Honeywell Technologies SARL
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Publication of EP2354657A3 publication Critical patent/EP2354657A3/en
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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
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
    • 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
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/20—Calibrating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Definitions

  • the invention relates to a method for operating a gas burner according to the preamble of claim 1 or 3.
  • a gas burner is supplied with a gas-combustion air mixture to burn the gas of the gas-combustion air mixture in the gas burner.
  • a flame is formed in the gas burner, it being already known from the prior art to check the presence of a flame in the gas burner by means of an ionization current provided by an ionization sensor. This can be ensured that when no flame is formed despite supplying a gas-combustion air mixture to the gas burner in the gas burner, that further supply of the gas-combustion air mixture can be suppressed to the gas burner.
  • the EP 1 293 727 A1 and the US 2004/009442 disclose further methods for operating a gas burner.
  • the invention is based on the problem to provide a novel method for operating a gas burner.
  • the composition of the gas-combustion air mixture in terms of calibration in defined operating points of the gas burner is discontinuously adjusted based on the ionization provided with the aid of the ionization, so that depending on the ionization adjusted the opening position of an integrated gas line in a gas valve and then with this Adjusting the amount of the gas burner to be supplied gas-combustion air mixture on the speed of a fan or blower independent of the ionisationsstrom regulated, is determined from the ionization provided by the ionization ionization current, if and if so to what extent the gas burner supplied gas combustion air mixture and a combustion chamber of the gas burner contains impurities, wherein, when it is determined that these impurities or the extent thereof are smaller than a first limit value, based on the de ionization current provided the composition of the gas-combustion air mixture is adjusted in terms of calibration, and when it is determined that these impurities or the extent thereof are
  • the composition and / or the amount of the gas-combustion air mixture in the sense of a control during operation of the gas burner is continuously or continuously or quasi-continuously set on the basis of the provided by means of the ionization Ionisationsstroms such that a dependent of the ionization current value with a corresponding setpoint value is compared and depending on a deviation determined between the setpoint and the actual value, the opening position of a gas valve integrated in a gas line and / or the speed of a fan or blower controlled, is determined from the ionization provided by the ionization sensor, if and where appropriate to what extent the gas burner combustion gas mixture supplied to the gas burner and a combustion chamber of the gas burner contains impurities, and then, if it is found that these impurities or the circumference thereof smaller than a first Gr are valued, on the basis of the provided by means of the ionization Ionisationsstroms the composition and / or amount of
  • the measured value of the ionization sensor is used not only for a new functionality when operating a gas burner, but also the quality in the adjustment of the composition and / or the amount of the gas burner to be supplied gas combustion air mixture can be increased.
  • Fig. 1 shows a highly schematic of a gas burner 10, wherein a combustion chamber 11 of the gas burner 10, a gas-combustion air mixture is supplied to burn the gas of the gas-combustion air mixture in the combustion chamber 11 of the gas burner 10.
  • a gas-combustion air mixture is supplied to burn the gas of the gas-combustion air mixture in the combustion chamber 11 of the gas burner 10.
  • a flame 12 in accordance with Fig. 1 an ionization sensor 13 protrudes.
  • the gas combustion air mixture to be supplied to the combustion chamber 11 of the gas burner 10 is supplied to the combustion chamber 11 of the gas burner 10 by means of a fan 14, which draws combustion air from a combustion air line 15.
  • the sucked combustion air is mixed with also sucked gas, which is conveyed via a gas line 16 in the direction of the combustion air line 15, wherein in the gas line 16, a gas valve 17 is integrated.
  • the composition of the gas-combustion air mixture can be adjusted.
  • the amount of the gas burner to be supplied gas-combustion air mixture can be adjusted.
  • gas valve 17 16 In addition to the gas valve 17 16 further gas valves 18 and 19 are integrated in the illustrated embodiment in the gas line, which serve a safety function.
  • the controller 20 transmits an actuator 21 of the gas valve 17, a control signal.
  • the controller 20 transmits to an actuator 22 of the fan 14, a corresponding control signal.
  • the control device 20 determines whether and / or to what extent or in what quantity the gas-combustion-air mixture fed to the gas burner and the combustion chamber 11 of the gas burner 10 contaminants, namely flammable Impurities, comprises or contains.
  • the controller 20 determines the composition and / or amount of the impurity the gas burner supplied gas-combustion air mixture adjusted by the controller 20 generates a control signal for the actuator 21 of the gas valve 17 and / or an actuating signal for the actuator 22 of the fan 14 depending on the currently provided ionization. If, on the other hand, it is found that these impurities or the extent or amount of impurities is or is greater than a second limit value, the composition and / or the quantity of the gas combustion air is determined on the basis of the ionization current provided by the ionization sensor 13.
  • the controller 20 keeps the composition and / or amount of the combustion chamber 11 of the gas burner 10 to be supplied gas combustion air mixture unchanged or constant, namely until it is found that the impurities or the extent of the impurities in the gas burner to be supplied gas combustion air mixture and in the combustion chamber 11 are smaller than the first limit or is.
  • the second limit may be greater than the first limit to form a hysteresis effect. In contrast, however, it is also possible that the first limit value corresponds to the second limit value.
  • the threshold (s) may be fixed or variable over the modulation range of the gas burner 10.
  • the composition and / or the quantity of the gas combustion air mixture to be supplied to the gas burner 10 are adjusted continuously or continuously or quasi-continuously in the sense of regulation during operation of the gas burner 10, in that an actual value dependent on the ionization current is compared with a corresponding setpoint value and the open position of the gas valve 17 integrated in a gas line 16 and / or the rotational speed of a fan 14 is regulated as a function of a deviation determined in this case.
  • This setting in the sense of a regulation is preferably carried out over the entire modulation range between full load and minimum partial load of the gas burner 10.
  • the composition of the gas burner 10 to be supplied gas combustion air mixture is adjusted discontinuously in the sense of a calibration in defined operating points of the gas burner based on the ionization measured by the ionization 13, that depending on the ionization the opening position of the in the Gas line 16 integrated gas valve 17 is set and then with this setting, the amount of the gas burner to be supplied gas-combustion air mixture is controlled by the speed of a fan or blower 14 regardless of the ionization.
  • a calibrated gas-air composite control is established with the control of fixed composition of the gas-combustion air mixture, the composition is then calibrated according to the invention.
  • This setting in the sense of a calibration is carried out exclusively in a modulation range in the vicinity of the full load of the gas burner 10, in particular in a modulation range between 70% and 100% of the full load of the gas burner 10, in defined operating points.
  • the invention is therefore based on the finding that in the gas-combustion air mixture and in the combustion chamber 11 of the gas burner 10 combustible impurities may be included, which adversely affect the quality of a Ionisationsstroms provided by the ionization 13 to the controller 20 ionization.
  • Fig. 2 two curves 23 and 24 are shown, for each of the time t, the ionization current I is plotted.
  • the curve 23 corresponds to an ionization current I, which then forms when 11 impurities are contained in a relatively large extent in the gas combustion air mixture and / or in the combustion chamber.
  • An ionization current I according to the curve 24 is formed when in the gas-combustion air mixture and in the combustion chamber 11 as well as no or relatively small impurities are included.
  • Fig. 2 shows that combustible impurities in the gas combustion air mixture or in the combustion chamber 11 of the gas burner cause significant fluctuations in the measurement signal or ionization I I.
  • Fig. 3 is over the circumference of the combustible impurities V in the gas-combustion air mixture or in the combustion chamber 11 of the gas burner 10, an ionization current I in the form of three curves 25, 26 and 27 plotted, wherein the curve 25 an average ionization depending on the extent of the combustible Impurities V corresponds, and wherein the curves 26 and 27 correspond to this mean plus or minus a standard deviation of the ionization current.
  • a measured value of the ionization current is detected and stored at defined time intervals for determining whether and / or to what extent the gas combustion gas mixture supplied to the gas burner or the combustion chamber 11 thereof combustible impurities a defined number of successive measurements, the standard deviation of the ionization current is determined.
  • This standard deviation of the ionization current is then compared with a corresponding first limit value and a corresponding second limit value such that, if the standard deviation of the ionization current is smaller than the first limit value, the composition and / or quantity of the gas gas to be supplied to the gas burner is determined on the basis of the ionization current. Combustion air mixture is adjusted.
  • the second limit value may be greater than the first limit value or correspond to the first limit value.
  • the composition and / or amount of the gas combustion air mixture to be supplied to the gas burner is set on the basis of the ionization flow.
  • the composition and / or amount of the gas combustion air mixture to be supplied to the gas burner is not adjusted based on the ionization flow, but kept unchanged.
  • the second limit value may be greater than the first limit value or correspond to the first limit value.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben eines Gasbrenners nach dem Oberbegriff des Anspruchs 1 oder 3.The invention relates to a method for operating a gas burner according to the preamble of claim 1 or 3.

Einem Gasbrenner wird ein Gas-Verbrennungsluft-Gemisch zugeführt, um das Gas des Gas-Verbrennungsluft-Gemischs im Gasbrenner zu verbrennen. Hierbei bildet sich im Gasbrenner eine Flamme aus, wobei es aus dem Stand der Technik bereits bekannt ist, das Vorhandensein einer Flamme im Gasbrenner anhand eines lonisationsstroms zu überprüfen, der von einem Ionisationssensor bereitgestellt wird. Hiermit kann gewährleistet werden, dass dann, wenn sich trotz Zuführen eines Gas-Verbrennungsluft-Gemischs zum Gasbrenner im Gasbrenner keine Flamme ausbildet, dass weitere Zuführen des Gas-Verbrennungsluft-Gemischs zum Gasbrenner unterbunden werden kann.A gas burner is supplied with a gas-combustion air mixture to burn the gas of the gas-combustion air mixture in the gas burner. In this case, a flame is formed in the gas burner, it being already known from the prior art to check the presence of a flame in the gas burner by means of an ionization current provided by an ionization sensor. This can be ensured that when no flame is formed despite supplying a gas-combustion air mixture to the gas burner in the gas burner, that further supply of the gas-combustion air mixture can be suppressed to the gas burner.

Aus dem Stand der Technik ist es weiterhin bekannt, auf Grundlage des von einem Ionisationssensor bereitgestellten bzw. gemessenen Ionisationsstroms die Zusammensetzung und/oder die Menge des dem Gasbrenner, nämlich einer Brennkammer desselben, zuzuführenden Gas-Verbrennungsluft-Gemischs einzustellen, insbesondere zu regeln.From the state of the art, it is further known, on the basis of the ionization flow provided or measured by an ionization sensor, to set, in particular to regulate, the composition and / or the amount of the gas burner, namely a combustion chamber, of the gas-combustion-air mixture to be supplied.

So ist es aus der EP 1 002 997 A2 bekannt, auf Grundlage eines von einer lonisations-Elektrode gemessenen Ionisationssignals eine Luftzahlregelung eines mit einem Lüfter und einem Gasventil versehenen Gasbrenners auszuführen. Aus der WO 2009/089886 A2 ist es bekannt, mit Hilfe des Ionisationsstroms zu überwachen, ob eine stabile oder instabile Verbrennung im Gasbrenner vorliegt. In der DE 102 58 187 B4 wird vorgeschlagen, auf dem Ionisationsstroms auf einen Verschmutzungs- und/oder Verstopfungszustand eines Siphons zu schließen.So it is from the EP 1 002 997 A2 It is known to carry out an air number regulation of a gas burner provided with a fan and a gas valve on the basis of an ionization signal measured by an ionization electrode. From the WO 2009/089886 A2 It is known to monitor with the help of the ionization current, whether a stable or unstable combustion is present in the gas burner. In the DE 102 58 187 B4 It is proposed to conclude on the ionization current to a contamination and / or clogging state of a siphon.

Die EP 1 293 727 A1 und die US 2004/009442 offenbaren weitere Verfahren zum Betreiben eines Gasbrenners.The EP 1 293 727 A1 and the US 2004/009442 disclose further methods for operating a gas burner.

Bislang bekannte Verfahren zum Betreiben eines Gasbrenners, die auf Grundlage eines von einem Ionisationssensor gemessenen Ionisationsstroms die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemisch einstellen, lassen außer Betracht, dass der Ionisationsstrom nicht nur von der Zusammensetzung und/oder Menge des Gas-Verbrennungsluft-Gemischs abhängig ist, sondern auch von brennbaren Verunreinigungen, die in dem der Brennkammer des Gasbrenners zuzuführenden Gas-Verbrennungsluft-Gemischs sowie in der Brennkammer des Gasbrenners enthalten sind. Falls diese Verunreinigungen gering sind, kann der Effekt derselben auf den Ionisationsstrom vernachlässigt werden. Dann hingegen, wenn Verunreinigungen in großem Umfang vorliegen, ist der Einfluss derselben auf das Ionisationssignal so stark, dass sich Ungenauigkeiten in der Einstellung ergeben können. Dies von Nachteil und muss zuverlässig vermieden werden.Previously known methods for operating a gas burner, which set the composition and / or amount of gas-combustion air mixture to be supplied to the gas burner on the basis of an ionization current measured by an ionization sensor, disregard that the ionization current is not only dependent on the composition and / or amount is dependent on the gas-combustion air mixture, but also of combustible impurities contained in the combustion chamber of the gas burner to be supplied gas-combustion air mixture and in the combustion chamber of the gas burner. If these impurities are small, the effect of the same on the ionization current can be neglected. On the other hand, if there is a large amount of contaminants, their influence on the ionization signal is so strong that inaccuracies in the adjustment may result. This disadvantage and must be reliably avoided.

Hiervon ausgehend liegt der Erfindung das Problem zu Grunde, ein neuartiges Verfahren zum Betreiben eines Gasbrenners zu schaffen.On this basis, the invention is based on the problem to provide a novel method for operating a gas burner.

Dieses Problem wird nach einem ersten Aspekt durch ein Verfahren nach Anspruch 1 gelöst. Hiernach wird auf Basis des mit Hilfe des Ionisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung des Gas-Verbrennungsluft-Gemischs im Sinne einer Kalibrierung in definierten Betriebspunkten des Gasbrenners diskontinuierlich derart eingestellt wird, dass abhängig vom Ionisationsstrom die Öffnungsstellung eines in eine Gasleitung integrierten Gasventils eingestellt und anschließend mit dieser Einstellung die Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs über die Drehzahl eines Lüfters bzw. Gebläses unabhängig vom lonisationsstrom geregelt, wobei aus dem vom Ionisationssensor bereitgestellten lonisationsstrom ermittelt wird, ob und gegebenenfalls in welchem Umfang das dem Gasbrenner zugeführte Gas-Verbrennungsluft-Gemisch sowie eine Brennkammer des Gasbrenners Verunreinigungen enthält, wobei dann, wenn festgestellt wird, das diese Verunreinigungen bzw. der Umfang derselben kleiner als ein erster Grenzwert sind, auf Basis des mit Hilfe des Ionisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung des Gas-Verbrennungsluft-Gemischs im Sinne der Kalibrierung eingestellt wird, und wobei dann, wenn festgestellt wird, das diese Verunreinigungen bzw. der Umfang derselben größer als ein zweiter Grenzwert sind, auf Basis des mit Hilfe des lonisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung des Gas-Verbrennungsluft-Gemischs Sinne der Kalibrierung nicht eingestellt wird.This problem is solved according to a first aspect by a method according to claim 1. Thereafter, the composition of the gas-combustion air mixture in terms of calibration in defined operating points of the gas burner is discontinuously adjusted based on the ionization provided with the aid of the ionization, so that depending on the ionization adjusted the opening position of an integrated gas line in a gas valve and then with this Adjusting the amount of the gas burner to be supplied gas-combustion air mixture on the speed of a fan or blower independent of the ionisationsstrom regulated, is determined from the ionization provided by the ionization ionization current, if and if so to what extent the gas burner supplied gas combustion air mixture and a combustion chamber of the gas burner contains impurities, wherein, when it is determined that these impurities or the extent thereof are smaller than a first limit value, based on the de ionization current provided the composition of the gas-combustion air mixture is adjusted in terms of calibration, and when it is determined that these impurities or the extent thereof are greater than a second limit, based on the provided by means of the ionisation Ionisationsstroms the composition of the gas-combustion air mixture sense of calibration is not set.

Dieses Problem wird nach einem zweiten Aspekt durch ein Verfahren nach Anspruch 3 gelöst. Hiernach wird auf Basis des mit Hilfe des Ionisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung und/oder die Menge des Gas-Verbrennungsluft-Gemischs im Sinne einer Regelung während des Betriebs des Gasbrenners fortlaufend bzw. kontinuierlich oder quasikontinuierlich derart eingestellt wird, dass ein vom Ionisationsstrom abhängiger Istwert mit einem entsprechenden Sollwert verglichen und abhängig von einer hierbei ermittelten Abweichung zwischen dem Sollwert und dem Istwert die Öffnungsstellung eines in eine Gasleitung integrierten Gasventils und/oder die Drehzahl eines Lüfters bzw. Gebläses geregelt, wobei aus dem vom Ionisationssensor bereitgestellten Ionisationsstrom ermittelt wird, ob und gegebenenfalls in welchem Umfang das dem Gasbrenner zugeführte Gas-Verbrennungsluft-Gemisch sowie eine Brennkammer des Gasbrenners Verunreinigungen enthält, wobei dann, wenn festgestellt wird, das diese Verunreinigungen bzw. der Umfang derselben kleiner als ein erster Grenzwert sind, auf Basis des mit Hilfe des Ionisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung und/oder Menge des Gas-Verbrennungsluft-Gemischs im Sinne der Regelung eingestellt wird, und wobei dann, wenn festgestellt wird, das diese Verunreinigungen bzw. der Umfang derselben größer als ein zweiter Grenzwert sind, auf Basis des mit Hilfe des Ionisationssensors bereitgestellten Ionisationsstroms die Zusammensetzung und/oder Menge des Gas-Verbrennungsluft-Gemischs im Sinne der Regelung nicht eingestellt wird.This problem is solved according to a second aspect by a method according to claim 3. Thereafter, the composition and / or the amount of the gas-combustion air mixture in the sense of a control during operation of the gas burner is continuously or continuously or quasi-continuously set on the basis of the provided by means of the ionization Ionisationsstroms such that a dependent of the ionization current value with a corresponding setpoint value is compared and depending on a deviation determined between the setpoint and the actual value, the opening position of a gas valve integrated in a gas line and / or the speed of a fan or blower controlled, is determined from the ionization provided by the ionization sensor, if and where appropriate to what extent the gas burner combustion gas mixture supplied to the gas burner and a combustion chamber of the gas burner contains impurities, and then, if it is found that these impurities or the circumference thereof smaller than a first Gr are valued, on the basis of the provided by means of the ionization Ionisationsstroms the composition and / or amount of the gas-combustion air mixture is set in accordance with the regulation, and then when it is determined that these impurities or the extent thereof is greater than one second limit are, based on the provided by means of the ionization ionization current, the composition and / or amount of the gas-combustion air mixture is not set in the sense of the scheme.

Mit beiden Aspekten der Erfindung wird erstmals vorgeschlagen, das vom lonisationssensor bereitgestellte Messsignal, also den Ionisationsstrom, dahingehend auszuwerten, dass auf Grundlage des Ionisationsstroms festgestellt wird, ob und gegebenenfalls in welchem Umfang bzw. in welcher Menge das dem Gasbrenner zugeführte Gas-Verbrennungsluft-Gemisch sowie die Brennkammer des Gasbrenners brennbare Verunreinigungen enthalten, welche die Qualität des vom Ionisationssensor bereitgestellten Messsignals beeinträchtigen.With both aspects of the invention, it is proposed for the first time to evaluate the ionization current provided by the ionization sensor to the effect that, based on the ionization current, it is ascertained whether and, if appropriate, to what extent or in what quantity the gas combustion air mixture supplied to the gas burner and the combustor of the gas burner contain combustible impurities which affect the quality of the measurement signal provided by the ionization sensor.

Hierdurch wird der Messwert des Ionisationssensors nicht nur für eine neue Funktionalität beim Betreiben eines Gasbrenners genutzt, vielmehr kann auch die Qualität in der Einstellung der Zusammensetzung und/oder der Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs gesteigert werden.As a result, the measured value of the ionization sensor is used not only for a new functionality when operating a gas burner, but also the quality in the adjustment of the composition and / or the amount of the gas burner to be supplied gas combustion air mixture can be increased.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Nachfolgend werden Ausführungsbeispiele der Erfindung, ohne hierauf beschränkt zu sein, anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:

Fig. 1:
ein Blockschaltbild eines Gasbrenners zur Verdeutlichung des erfindungsgemäßen Verfahrens zum Betreiben eines Gasbrenners;
Fig. 2:
ein erstes Diagramm zur weiteren Verdeutlichung des erfindungsgemäßen Verfahrens zum Betreiben eines Gasbrenners; und
Fig. 3:
ein zweites Diagramm zur weiteren Verdeutlichung des erfindungsgemäßen Verfahrens zum Betreiben eines Gasbrenners.
Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Hereinafter, embodiments of the invention, without being limited thereto, explained in more detail with reference to the drawing. In the drawing shows:
Fig. 1:
a block diagram of a gas burner to illustrate the inventive method for operating a gas burner;
Fig. 2:
a first diagram for further illustrating the method for operating a gas burner according to the invention; and
3:
a second diagram for further clarification of the method according to the invention for operating a gas burner.

Die hier vorliegende Erfindung betrifft ein Verfahren zum Betreiben eines Gasbrenners. Fig. 1 zeigt stark schematisiert einen Gasbrenner 10, wobei einer Brennkammer 11 des Gasbrenners 10 ein Gas-Verbrennungsluft-Gemisch zugeführt wird, um das Gas des Gas-Verbrennungsluft-Gemischs in der Brennkammer 11 des Gasbrenners 10 zu verbrennen. Bei der Verbrennung des Gas-Verbrennungsluft-Gemischs in der Brennkammer 11 des Gasbrenners 10 bildet sich in der Brennkammer 11 gemäß Fig. 1 eine Flamme 12 aus, in die gemäß Fig. 1 ein Ionisationssensor 13 hineinragt.The present invention relates to a method for operating a gas burner. Fig. 1 shows a highly schematic of a gas burner 10, wherein a combustion chamber 11 of the gas burner 10, a gas-combustion air mixture is supplied to burn the gas of the gas-combustion air mixture in the combustion chamber 11 of the gas burner 10. In the combustion of the gas combustion air mixture in the combustion chamber 11 of the gas burner 10 is formed in the combustion chamber 11 according to Fig. 1 a flame 12, in accordance with Fig. 1 an ionization sensor 13 protrudes.

Das der Brennkammer 11 des Gasbrenners 10 zuzuführende Gas-Verbrennungsluft-Gemisch wird der Brennkammer 11 des Gasbrenners 10 mithilfe eines Lüfters 14 zugeführt, der Verbrennungsluft aus einer Verbrennungsluftleitung 15 ansaugt. Die angesaugte Verbrennungsluft wird mit ebenfalls angesaugtem Gas gemischt, welches über eine Gasleitung 16 in Richtung auf die Verbrennungsluftleitung 15 gefördert wird, wobei in die Gasleitung 16 ein Gasventil 17 integriert ist.The gas combustion air mixture to be supplied to the combustion chamber 11 of the gas burner 10 is supplied to the combustion chamber 11 of the gas burner 10 by means of a fan 14, which draws combustion air from a combustion air line 15. The sucked combustion air is mixed with also sucked gas, which is conveyed via a gas line 16 in the direction of the combustion air line 15, wherein in the gas line 16, a gas valve 17 is integrated.

Über das Gasventil 17 kann die Zusammensetzung des Gas-Verbrennungsluft-Gemischs eingestellt werden. Über den Lüfter 14 kann die Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs eingestellt werden.Via the gas valve 17, the composition of the gas-combustion air mixture can be adjusted. Via the fan 14, the amount of the gas burner to be supplied gas-combustion air mixture can be adjusted.

Neben dem Gasventil 17 sind im gezeigten Ausführungsbeispiel in die Gasleitung 16 weitere Gasventile 18 und 19 integriert, die einer Sicherheitsfunktion dienen.In addition to the gas valve 17 16 further gas valves 18 and 19 are integrated in the illustrated embodiment in the gas line, which serve a safety function.

Das vom Ionisationssensor 13 bereitgestellte Messsignal, nämlich der vom Ionisationssensor 13 gemessene Ionisationsstrom, wird einer Steuerungseinrichtung 20 zugeführt, wobei die Steuerungseinrichtung 20 auf Grundlage des vom Ionisationssensor 13 bereitgestellten Ionisationsstroms die Zusammensetzung und/oder Menge des der Brennkammer 11 des Gasbrenners 10 zuzuführenden Gas-Verbrennungsluft-Gemischs einstellt. Zur Einstellung der Zusammensetzung des dem Gasbrenner bzw. der Brennkammer 11 desselben zuzuführenden Gas-Verbrennungsluft-Gemischs übermittelt die Steuerungseinrichtung 20 einem Aktuator 21 des Gasventils 17 ein Stellsignal. Zur Einstellung der Menge des dem Gasbrenner, nämlich der Brennkammer 11 desselben, zuzuführenden Gas-Verbrennungsluft-Gemischs übermittelt die Steuerungseinrichtung 20 an einen Aktuator 22 des Lüfters 14 ein entsprechendes Stellsignal.The measurement signal provided by the ionization sensor 13, namely the ionization current measured by the ionization sensor 13, is supplied to a controller 20, the controller 20 based on the ionization provided by the ionization 13, the composition and / or amount of the combustion chamber 11 of the gas burner 10 to be supplied gas combustion air Mix. To set the composition of the gas burner or the combustion chamber 11 thereof to be supplied gas combustion air mixture, the controller 20 transmits an actuator 21 of the gas valve 17, a control signal. To set the amount of the gas burner, namely the combustion chamber 11 thereof, to be supplied gas-combustion air mixture, the controller 20 transmits to an actuator 22 of the fan 14, a corresponding control signal.

Erfindungsgemäß wird aus dem vom Ionisationssensor 13 bereitgestellten lonisationsstrom, vorzugsweise von der Steuerungseinrichtung 20, ermittelt, ob und/oder in welchem Umfang bzw. in welcher Menge das dem Gasbrenner zugeführte Gas-Verbrennungsluft-Gemisch sowie die Brennkammer 11 des Gasbrenners 10 Verunreinigungen, nämlich brennbare Verunreinigungen, aufweist bzw. enthält. Dann, wenn festgestellt wird, dass diese Verunreinigungen bzw. der Umfang bzw. die Menge der Verunreinigungen kleiner als ein erster Grenzwert sind bzw. ist, wird auf Basis des mithilfe des Ionisationssensors 13 bereitgestellten Ionisationsstroms von der Steuerungseinrichtung 20 die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs eingestellt, indem die Steuerungseinrichtung 20 abhängig vom aktuell bereitgestellten Ionisationsstrom ein Stellsignal für den Aktuator 21 des Gasventils 17 und/oder ein Stellsignal für den Aktuator 22 des Lüfters 14 erzeugt. Wird hingegen festgestellt, dass diese Verunreinigungen bzw. der Umfang bzw. die Menge der Verunreinigungen größer als ein zweiter Grenzwert sind bzw. ist, so wird auf Basis des mithilfe des Ionisationssensors 13 bereitgestellten lonisationsstroms die Zusammensetzung und/oder die Menge des Gas-Verbrennungsluft-Gemischs nicht eingestellt, vielmehr hält die Steuerungseinrichtung 20 die Zusammensetzung und/oder Menge des der Brennkammer 11 des Gasbrenners 10 zuzuführenden Gas-Verbrennungsluft-Gemischs unverändert bzw. konstant, nämlich so lange, bis festgestellt wird, dass die Verunreinigungen bzw. der Umfang der Verunreinigungen im dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs sowie in der Brennkammer 11 kleiner als der erste Grenzwert sind bzw. ist.According to the invention, it is determined from the ionization current provided by the ionization sensor 13, preferably by the control device 20, whether and / or to what extent or in what quantity the gas-combustion-air mixture fed to the gas burner and the combustion chamber 11 of the gas burner 10 contaminants, namely flammable Impurities, comprises or contains. Then, when it is determined that these impurities are smaller than a first threshold, based on the ionization current provided by the ionization sensor 13, the controller 20 determines the composition and / or amount of the impurity the gas burner supplied gas-combustion air mixture adjusted by the controller 20 generates a control signal for the actuator 21 of the gas valve 17 and / or an actuating signal for the actuator 22 of the fan 14 depending on the currently provided ionization. If, on the other hand, it is found that these impurities or the extent or amount of impurities is or is greater than a second limit value, the composition and / or the quantity of the gas combustion air is determined on the basis of the ionization current provided by the ionization sensor 13. Mixture not set, but the controller 20 keeps the composition and / or amount of the combustion chamber 11 of the gas burner 10 to be supplied gas combustion air mixture unchanged or constant, namely until it is found that the impurities or the extent of the impurities in the gas burner to be supplied gas combustion air mixture and in the combustion chamber 11 are smaller than the first limit or is.

Der zweite Grenzwert kann dabei größer als der erste Grenzwert sein, um einen Hystereseeffekt auszubilden. Im Unterschied hierzu ist es jedoch auch möglich, dass der erste Grenzwert dem zweiten Grenzwert entspricht. Der oder die Grenzwerte können über den Modulationsbereich des Gasbrenners 10 fest oder variabel sein.The second limit may be greater than the first limit to form a hysteresis effect. In contrast, however, it is also possible that the first limit value corresponds to the second limit value. The threshold (s) may be fixed or variable over the modulation range of the gas burner 10.

Nach einem Aspekt der Erfindung wird auf Basis des vom Ionisationssensor 13 gemessenen Ionisationsstroms die Zusammensetzung und/oder die Menge des dem Gasbrenner 10 zuzuführenden Gas-Verbrennungsluft-Gemischs im Sinne einer Regelung während des Betriebs des Gasbrenners 10 fortlaufend bzw. kontinuierlich oder quasikontinuierlich derart eingestellt, dass ein vom Ionisationsstrom abhängiger Istwert mit einem entsprechenden Sollwert verglichen und abhängig von einer hierbei ermittelten Abweichung die Öffnungsstellung des in eine Gasleitung 16 integrierten Gasventils 17 und/oder die Drehzahl eines Lüfters 14 geregelt wird.According to one aspect of the invention, based on the ionization current measured by the ionization sensor 13, the composition and / or the quantity of the gas combustion air mixture to be supplied to the gas burner 10 are adjusted continuously or continuously or quasi-continuously in the sense of regulation during operation of the gas burner 10, in that an actual value dependent on the ionization current is compared with a corresponding setpoint value and the open position of the gas valve 17 integrated in a gas line 16 and / or the rotational speed of a fan 14 is regulated as a function of a deviation determined in this case.

Diese Einstellung im Sinne einer Regelung wird vorzugsweise über den gesamten Modulationsbereich zwischen Volllast und minimaler Teillast des Gasbrenners 10 durchgeführt.This setting in the sense of a regulation is preferably carried out over the entire modulation range between full load and minimum partial load of the gas burner 10.

Nach einem weiteren Aspekt der Erfindung wird auf Basis des vom Ionisationssensor 13 gemessenen Ionisationsstroms die Zusammensetzung des dem Gasbrenner 10 zuzuführenden Gas-Verbrennungsluft-Gemischs im Sinne einer Kalibrierung in definierten Betriebspunkten des Gasbrenners diskontinuierlich derart eingestellt wird, dass abhängig vom Ionisationsstrom die Öffnungsstellung des in die Gasleitung 16 integrierten Gasventils 17 eingestellt und anschließend mit dieser Einstellung die Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs über die Drehzahl eines Lüfters bzw. Gebläses 14 unabhängig vom Ionisationsstrom geregelt wird. Auf dieser Art und Weise wird dann eine kalibrierte Gas-Luft-Verbundregelung etabliert mit bei der Regelung fester Zusammensetzung des Gas-Verbrennungsluft-Gemischs, wobei die Zusammensetzung dann im Sinne der Erfindung kalibrierbar ist.According to a further aspect of the invention, the composition of the gas burner 10 to be supplied gas combustion air mixture is adjusted discontinuously in the sense of a calibration in defined operating points of the gas burner based on the ionization measured by the ionization 13, that depending on the ionization the opening position of the in the Gas line 16 integrated gas valve 17 is set and then with this setting, the amount of the gas burner to be supplied gas-combustion air mixture is controlled by the speed of a fan or blower 14 regardless of the ionization. In this way, then a calibrated gas-air composite control is established with the control of fixed composition of the gas-combustion air mixture, the composition is then calibrated according to the invention.

Diese Einstellung im Sinne einer Kalibrierung wird ausschließlich in einem Modulationsbereich in der Nähe der Volllast des Gasbrenners 10 durchgeführt, insbesondere in einem Modulationsbereich zwischen 70% und 100% der Volllast des Gasbrenners 10, und zwar in definierten Betriebspunkten.This setting in the sense of a calibration is carried out exclusively in a modulation range in the vicinity of the full load of the gas burner 10, in particular in a modulation range between 70% and 100% of the full load of the gas burner 10, in defined operating points.

Der Erfindung liegt demnach die Erkenntnis zugrunde, dass in dem Gas-Verbrennungsluft-Gemisch sowie in der Brennkammer 11 des Gasbrenners 10 brennbare Verunreinigungen enthalten sein können, welche die Qualität eines vom lonisationssensor 13 dem Regler 20 bereitgestellten Ionisationsstroms negativ beeinflussen.The invention is therefore based on the finding that in the gas-combustion air mixture and in the combustion chamber 11 of the gas burner 10 combustible impurities may be included, which adversely affect the quality of a Ionisationsstroms provided by the ionization 13 to the controller 20 ionization.

In Fig. 2 sind zwei Kurven 23 und 24 gezeigt, für die jeweils über der Zeit t der lonisationsstrom I aufgetragen ist. Die Kurve 23 entspricht dabei einem lonisationsstrom I, der sich dann ausbildet, wenn im Gas-Verbrennungsluft-Gemisch und/oder in der Brennkammer 11 Verunreinigungen in relativ großem Umfang enthalten sind. Ein lonisationsstrom I gemäß der Kurve 24 bildet sich dann aus, wenn im Gas-Verbrennungsluft-Gemisch sowie in der Brennkammer 11 so gut wie keine bzw. relativ geringe Verunreinigungen enthalten sind. Fig. 2 zeigt, dass brennbare Verunreinigungen im Gas-Verbrennungsluft-Gemisch bzw. in der Brennkammer 11 des Gasbrenners deutliche Schwankungen im Messsignal bzw. Ionisationsstrom I verursachen.In Fig. 2 two curves 23 and 24 are shown, for each of the time t, the ionization current I is plotted. The curve 23 corresponds to an ionization current I, which then forms when 11 impurities are contained in a relatively large extent in the gas combustion air mixture and / or in the combustion chamber. An ionization current I according to the curve 24 is formed when in the gas-combustion air mixture and in the combustion chamber 11 as well as no or relatively small impurities are included. Fig. 2 shows that combustible impurities in the gas combustion air mixture or in the combustion chamber 11 of the gas burner cause significant fluctuations in the measurement signal or ionization I I.

In Fig. 3 ist über dem Umfang der brennbaren Verunreinigungen V im Gas-Verbrennungsluft-Gemisch bzw. in der Brennkammer 11 des Gasbrenners 10 ein lonisationsstrom I in Form von drei Kurven 25, 26 und 27 aufgetragen, wobei die Kurve 25 einem durchschnittlichen Ionisationsstrom abhängig vom Umfang der brennbaren Verunreinigungen V entspricht, und wobei die Kurvenverläufe 26 bzw. 27 diesem Mittelwert zuzüglich bzw. abzüglich einer Standardabweichung des Ionisationsstroms entsprechen. Fig. 3 kann entnommen werden, dass sich mit zunehmendem Umfang der brennbaren Verunreinigungen V der Mittelwert 25 des Ionisationsstroms zwar nur geringfügig ändert, dass jedoch die Standardabweichungen des Ionisationsstroms abhängig von dem Umfang der brennbaren Verunreinigungen V für eine deutliche Änderung in den Kurvenverläufen 26 und 27 sorgen.In Fig. 3 is over the circumference of the combustible impurities V in the gas-combustion air mixture or in the combustion chamber 11 of the gas burner 10, an ionization current I in the form of three curves 25, 26 and 27 plotted, wherein the curve 25 an average ionization depending on the extent of the combustible Impurities V corresponds, and wherein the curves 26 and 27 correspond to this mean plus or minus a standard deviation of the ionization current. Fig. 3 It can be seen that, with increasing extent of the combustible impurities V, the mean value 25 of the ionization current only changes slightly, but that the standard deviations of the ionization current, depending on the extent of the combustible impurities V, provide a clear change in the curves 26 and 27.

Nach einer vorteilhaften Weiterbildung der Erfindung wird für die Ermittlung, ob und/oder in welchem Umfang das dem Gasbrenner zugeführte Gas-Verbrennungsluft-Gemisch bzw. die Brennkammer 11 desselben brennbare Verunreinigungen aufweist, in definierten Zeitabständen einen Messwert des Ionisationsstroms erfasst und gespeichert, wobei für eine definierte Anzahl von aufeinanderfolgenden Messungen die Standardabweichung des Ionisationsstroms ermittelt wird.According to an advantageous development of the invention, a measured value of the ionization current is detected and stored at defined time intervals for determining whether and / or to what extent the gas combustion gas mixture supplied to the gas burner or the combustion chamber 11 thereof combustible impurities a defined number of successive measurements, the standard deviation of the ionization current is determined.

Diese Standardabweichung des Ionisationsstroms wird dann mit einem entsprechenden ersten Grenzwert und einem entsprechenden zweiten Grenzwert derart verglichen, dass dann, wenn die Standardabweichung des Ionisationsstroms kleiner als der erste Grenzwert ist, auf Basis des Ionisationsstroms die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs eingestellt wird.This standard deviation of the ionization current is then compared with a corresponding first limit value and a corresponding second limit value such that, if the standard deviation of the ionization current is smaller than the first limit value, the composition and / or quantity of the gas gas to be supplied to the gas burner is determined on the basis of the ionization current. Combustion air mixture is adjusted.

Dann hingegen, wenn die Standardabweichung des Ionisationsstroms größer als ein entsprechender zweiter Grenzwert ist, wird auf Basis des Ionisationsstroms die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs nicht eingestellt, sondern unverändert bleibt. Dabei kann, wie bereits ausgeführt, der zweite Grenzwert größer als der erste Grenzwert sein oder dem ersten Grenzwert entsprechen.Then, on the other hand, if the standard deviation of the ionization current is greater than a corresponding second limit value, the composition and / or amount of the gas combustion air mixture to be supplied to the gas burner is not set based on the ionization flow, but remains unchanged. In this case, as already stated, the second limit value may be greater than the first limit value or correspond to the first limit value.

Im Unterschied zur oben beschriebenen Ermittlung des Umfangs der brennbaren Verunreinigungen auf Basis der Standardabweichung des Ionisationsstroms ist es alternativ auch möglich, in definierten Zeitabständen einen Messwert des Ionisationsstroms zu erfassen und zu speichern, wobei dann überprüft wird, wie viele dieser Messwerte aus einer definierten Anzahl von aufeinanderfolgenden Messungen größer als ein oberer Grenzwert für den Ionisationsstrom oder kleiner als ein unterer Grenzwert für denselben sind. Dann, wenn diese Teilmenge aus der Anzahl von aufeinanderfolgenden Messungen kleiner als ein entsprechender erster Grenzwert ist, wird auf Basis des Ionisationsstroms die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs eingestellt. Dann hingegen, wenn die Teilmenge aus der Anzahl von aufeinanderfolgenden Messungen größer als ein entsprechender zweiter Grenzwert ist, wird auf Basis des Ionisationsstroms die Zusammensetzung und/oder Menge des dem Gasbrenner zuzuführenden Gas-Verbrennungsluft-Gemischs nicht eingestellt, sondern wieder unverändert gehalten. Dabei kann der zweite Grenzwert größer als der erste Grenzwert sein oder dem ersten Grenzwert entsprechen.In contrast to the above-described determination of the extent of combustible impurities on the basis of the standard deviation of the ionization current, it is alternatively also possible to detect and store a measured value of the ionization current at defined time intervals, wherein it is then checked how many of these measured values are from a defined number of times successive measurements are greater than or less than an upper limit of the ionization current for the ionization current. Then, if this subset of the number of consecutive measurements is less than a corresponding first limit value, the composition and / or amount of the gas combustion air mixture to be supplied to the gas burner is set on the basis of the ionization flow. On the other hand, if the subset of the number of successive measurements is greater than a corresponding second limit value, the composition and / or amount of the gas combustion air mixture to be supplied to the gas burner is not adjusted based on the ionization flow, but kept unchanged. In this case, the second limit value may be greater than the first limit value or correspond to the first limit value.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Gasbrennergas burner
1111
Brennkammercombustion chamber
1212
Flammeflame
1313
Ionisationssensorionization
1414
LüfterFan
1515
VerbrennungsluftleitungCombustion air line
1616
Gasleitunggas pipe
1717
Gasventilgas valve
1818
Gasventilgas valve
1919
Gasventilgas valve
2020
Steuerungseinrichtungcontrol device
2121
Aktuatoractuator
2222
Aktuatoractuator
2323
KurveCurve
2424
KurveCurve
2525
KurveCurve
2626
KurveCurve
2727
KurveCurve

Claims (10)

  1. Method for operating a gas burner, wherein a gas/combustion-air mixture is fed to the gas burner for burning in the gas burner, wherein a flame of the gas burner forming during the combustion in the gas burner is monitored with the aid of an ionization sensor providing an ionization current as a measured variable, and wherein the composition and/or the amount of the gas/combustion-air mixture to be fed to the gas burner is set on the basis of the ionization current provided with the aid of the ionization sensor, characterized in that, on the basis of the ionization current provided with the aid of the ionization sensor, the composition of the gas/combustion-air mixture is set in the sense of a calibration discontinuously at defined operating points of the gas burner in such a way that, depending on the ionization current, the opening position of a gas valve integrated in a gas line is set and this setting is subsequently used to control the amount of the gas/combustion-air mixture to be fed to the gas burner independently of the ionization current by way of the rotational speed of a fan or blower, wherein it is determined from the ionization current provided by the ionization sensor whether and if so to what extent the gas/combustion-air mixture fed to the gas burner and a combustion chamber of the gas burner contain contaminants, wherein, whenever it is found that these contaminants or the extent of the same is less than a first limit value, the composition of the gas/combustion-air mixture is set on the basis of the ionization current provided with the aid of the ionization sensor in the sense of the calibration and wherein, whenever it is found that these contaminants or the extent of the same is greater than a second limit value, the composition of the gas/combustion-air mixture is not set on the basis of the ionization current provided with the aid of the ionization sensor in the sense of the calibration.
  2. Method according to Claim 1, characterized in that the setting in the sense of the calibration is carried out exclusively in a modulation range in the proximity of the full load of the gas burner.
  3. Method for operating a gas burner, wherein a gas/combustion-air mixture is fed to the gas burner for burning in the gas burner, wherein a flame of the gas burner forming during the combustion in the gas burner is monitored with the aid of an ionization sensor providing an ionization current as a measured variable, and wherein the composition and/or the amount of the gas/combustion-air mixture to be fed to the gas burner is set on the basis of the ionization current provided with the aid of the ionization sensor, characterized in that, on the basis of the ionization current provided with the aid of the ionization sensor, the composition and/or the amount of the gas/combustion-air mixture is set in the sense of a closed-loop control continually or continuously or quasi-continuously during the operation of the gas burner in such a way that, an actual value dependent on the ionization current is compared with a corresponding setpoint value and, depending on a deviation thereby determined between the setpoint value and the actual value, the opening position of a gas valve integrated in a gas line and/or the rotational speed of a fan or blower is controlled, wherein it is determined from the ionization current provided by the ionization sensor whether and if so to what extent the gas/combustion-air mixture fed to the gas burner and a combustion chamber of the gas burner contain contaminants, wherein, whenever it is found that these contaminants or the extent of the same is less than a first limit value, the composition and/or amount of the gas/combustion-air mixture is set on the basis of the ionization current provided with the aid of the ionization sensor in the sense of the closed-loop control and wherein, whenever it is found that these contaminants or the extent of the same is greater than a second limit value, the composition and/or amount of the gas/combustion-air mixture is not set on the basis of the ionization current provided with the aid of the ionization sensor in the sense of the closed-loop control.
  4. Method according to Claim 3, characterized in that the setting in the sense of the closed-loop control is carried out over the entire modulation range of the gas burner.
  5. Method according to one of Claims 1 to 4, characterized in that, whenever it is found that the gas/combustion-air mixture fed in in the gas burner and contaminants contained in the combustion chamber of the gas burner or the extent of the same are greater than a second limit value, the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is kept unchanged.
  6. Method according to Claim 5, characterized in that the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is kept unchanged until it is found that the gas/combustion-air mixture fed in in the gas burner and contaminants contained in the combustion chamber of the gas burner or the extent of the same are less than the first limit value.
  7. Method according to one of Claims 1 to 6, characterized in that the second limit value is greater than the first limit value.
  8. Method according to one of Claims 1 to 6, characterized in that the second limit value corresponds to the first limit value.
  9. Method according to one of Claims 1 to 8, characterized in that, for determining whether and if so to what extent the gas/combustion-air mixture fed to the gas burner and the combustion chamber of the gas burner contain contaminants, a measured value of the ionization current is recorded and stored at defined time intervals, wherein the standard deviation of the ionization current is determined by way of a defined number of successive measurements, wherein the standard deviation of the ionization current is compared with the first limit value and the second limit value in such a way that, whenever the standard deviation of the ionization current is less than the first limit value, the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is controlled on the basis of the ionization current at the particular time and that, whenever the standard deviation of the ionization current is greater than the second limit value, the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is not controlled on the basis of the ionization current at the particular time.
  10. Method according to one of Claims 1 to 8, characterized in that, for determining whether and if so to what extent the gas/combustion-air mixture fed to the gas burner and the combustion chamber of the gas burner contain contaminants, a measured value of the ionization current is recorded and stored at defined time intervals, wherein it is checked how many measured values from a defined number of successive measurements are greater than an upper limit value or less than a lower limit value, wherein this subset from the number of successive measurements is compared with the first limit value and the second limit value in such a way that, whenever the subset from the number of successive measurements is less than the first limit value, the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is controlled on the basis of the ionization current at the particular time and, whenever the subset from the number of successive measurements is greater than the second limit value, the composition and/or amount of the gas/combustion-air mixture to be fed to the gas burner is not controlled on the basis of the ionization current at the particular time.
EP11000080.9A 2010-01-15 2011-01-07 Method for operating a gas burner Active EP2354657B1 (en)

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EP2631541B1 (en) * 2012-02-27 2018-04-11 Honeywell Technologies Sarl Method for operating a gas burner
EP3869101A1 (en) 2020-02-19 2021-08-25 Pittway Sarl Flame monitoring device for a gas burner appliance and gas burner appliance
CN112879959A (en) * 2021-02-19 2021-06-01 珠海格力电器股份有限公司 Control method and device of gas stove, controller and gas stove system

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DE19853567A1 (en) 1998-11-20 2000-05-25 Kromschroeder Ag G Process for controlling the air ratio of a fully premixed gas burner
DE10003819C1 (en) * 2000-01-28 2001-05-17 Honeywell Bv Gas burner operating process, involving use of ionization signal and comparing differences in its readings
DE10030063C2 (en) * 2000-06-19 2003-03-20 Honeywell Bv Control procedures for gas burners
DE50108177D1 (en) * 2001-09-13 2005-12-29 Siemens Schweiz Ag Zuerich Control device for a burner and setting method
DE10258187B4 (en) * 2002-09-06 2006-12-28 Wolf Gmbh Method for monitoring and detecting an operating state of condensing boilers
DE102008005216B3 (en) * 2008-01-18 2009-07-23 Honeywell Technologies Sarl Method for operating a gas burner

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