EP2715236B1 - Method for monitoring a burner flame - Google Patents

Method for monitoring a burner flame Download PDF

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Publication number
EP2715236B1
EP2715236B1 EP12724599.1A EP12724599A EP2715236B1 EP 2715236 B1 EP2715236 B1 EP 2715236B1 EP 12724599 A EP12724599 A EP 12724599A EP 2715236 B1 EP2715236 B1 EP 2715236B1
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EP
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Prior art keywords
flame
flame light
light
photodetector
burner
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EP12724599.1A
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German (de)
French (fr)
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EP2715236A1 (en
Inventor
Samet DEVELI
Ali Ekbul
Hürrem Murat Altay
Furkan ACIK
Elif Tugce CERAN
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/04—Flame sensors sensitive to the colour of flames

Definitions

  • the invention relates to a method for monitoring a burner flame according to the preamble of claim 1. Furthermore, the invention relates to an arrangement for carrying out this method according to the preamble of claim 8.
  • combustion chambers of heaters come with gaseous, liquid or solid fuel-fired burner used.
  • Essential components for such a combustion technology are a fuel supply, a combustion air duct, optionally with a combustion air or exhaust fan, a burner surface, an ignition device, a flame monitoring device and a burner control device.
  • the flames are different depending on the design. There are so-called free-flames, from the burner surface lifting or sitting on flames, which are located within, in the surface area or with some distance outside of a flame holder or a burner surface.
  • various flame monitoring devices which generate a signal optically, temperature-dependent or even acoustically close to the flame. These signals must be processed by the electronic control device for burner operation.
  • optical flame monitoring has heretofore been limited to detecting the presence of a flame with photocells, diodes, transistors and resistors. Since only a distinction is made between light and dark, it is not possible to make any statements about the flame quality.
  • thermocouples and air pressure switches are known, ie indirect methods.
  • the observed effects of blockage of the exhaust path are an increase in carbon dioxide content and flame temperature. The flame color changes as well. Usually, when the quality of combustion is good, the flame is mostly blue. However, the flame turns yellow and orange towards red when, for example, the exhaust path is blocked.
  • the object of the invention is to optimize the operational reliability and monitoring of firing in the case of a burner fired with gaseous, liquid or solid fuels, in particular with regard to possible blockages in the exhaust path and / or increased exhaust emissions due to a lack of combustion quality.
  • the method for monitoring a burner flame is characterized in that the flame monitoring device has a filter device which absorbs a part of the color spectrum of the flame light and a filtered-light photodetector associated therewith and connected to the control device.
  • the flame light is passed directly or indirectly into the filter device.
  • the filter device consists of a housing having a colored inner wall absorbing a part of the color spectrum of the flame light, and an interior-mounted reflective light-emitting photodetector connected to the control device.
  • the filter device consists of a part of the color spectrum of the flame light absorbing filter in the direct or indirect path of the flame light, so that the photodetector evaluates filtered flame light.
  • the flame light is passed directly through an opening in a housing wall or via an indirect path, in particular via a light guide, into the interior.
  • the connected to the control device photodetector for filtered flame light is mounted in the interior of the housing so that it is not acted upon by the direct irradiation and that only the light reflected from the inner wall of the flame light reaches the photodetector.
  • This generates a voltage signal which is evaluated in the control device and used in particular for the derivation of a carbon dioxide and / or air ratio.
  • Lower voltage values characterize the normal operation and higher voltage values stand for unwanted deviations, which are then used by the software of the control device as Output signal, for example, indicate a fault.
  • the filter device starting from predominantly blue flame light in normal operation, absorbs especially blue and other color components in the color spectrum of the flame light, and reflects only red color components of the color spectrum. Only these are led to the photodetector, so that deviations in the flame light by deviations in orange and red color portions of the color spectrum signal deviations from the normal operation or disturbances.
  • the voltage signal generated by the photodetector in the control device is compared with the respective current burner power and adjusted according to predefinable support values for flame light conditions at different burner powers. This is justified by the fact that known modulating devices usually cover a range of about 25% to 100% of their rated power.
  • the modulation range is limited, inter alia, by the resulting combustion height of the mixture, which in any case must be smaller than the combustion chamber height for emission reasons.
  • This burnout results from the Schugasvolumenstrom, the relevant burner cross-section, the air ratio of the gas-air mixture and the back pressure in the combustion chamber.
  • the flame is also in different height ranges to the burner surface and can assume different colors.
  • the temperature-dependent radiation intensity of the burner surface can vary. For example, if the flame gets stuck, the burner surface may glow and contribute to the flames as well. Therefore, the signal generated by the photodetector should be compensated depending on the power, also to avoid unwanted disturbance messages, which could possibly occur in an excessive signal in special normal operating conditions.
  • the arrangement for carrying out the above-described method for monitoring a burner flame comprises a flame monitoring device with a filter device which absorbs part of the color spectrum of the flame light and a filtered flame light photodetector associated therewith and connected to the control device.
  • the reliability and monitoring of firing is thus optimized in the case of a burner fired with gaseous, liquid or solid fuels.
  • the flame image or the flame light is directly evaluated according to the invention with the photodetector.
  • the reflector surface according to the invention is able to hide wavelengths which are close to the red spectrum.
  • the arrangement for carrying out the method for monitoring a burner flame for a burner 1 fired with gaseous, liquid or solid fuels in a surrounding combustion chamber 2 consists essentially of a control device 3 for burner operation and a flame monitoring device 4.
  • the flame monitoring device 4 has a filter device 5 which absorbs a part of the color spectrum of the flame light and a filtered-light photodetector 6 associated therewith and connected to the control device 3.
  • the filter device 5 in Fig. 1 and Fig. 2 consists of a housing with a colored inner wall absorbing a part of the color spectrum of the flame light and the photodetector 6 mounted in the interior of the latter for internal flame light.
  • Fig. 1 is the flame light on a direct path through an opening 7 in a housing wall or according to Fig. 2 via an indirect path, in particular via a light guide 8, passed into the interior.
  • the filtered-flame photodetector 6 is mounted in the interior of the housing such that only the flame light reflected and thus filtered by the inner wall reaches the photodetector 6.
  • the filter device 5 in Fig. 3 consists of a partially translucent filter element, such as a glass, which absorbs portions of the flame spectrum, passes other portions of the spectrum.
  • the flame light reaches the filter device 5 via an opening in a wall of the combustion chamber 2.
  • the photodetector 6 is arranged, which detects the light passing through the filter and transmits a corresponding signal to the control device 3.

Description

Die Erfindung betrifft ein Verfahren zum Überwachen einer Brennerflamme nach dem Oberbegriff des Patentanspruches 1. Weiterhin betrifft die Erfindung eine Anordnung zur Durchführung dieses Verfahrens nach dem Oberbegriff des Patentanspruches 8. In Brennkammern von Heizgeräten kommen mit gasförmigen, flüssigen oder festen Brennstoffen befeuerte Brenner zum Einsatz. Wesentliche Komponenten für eine derartige Feuerungstechnik sind eine Brennstoffzuführung, ein Verbrennungsluftkanal, wahlweise mit einem Verbrennungsluft- oder Abgasgebläse, eine Brenneroberfläche, eine Zündvorrichtung, eine Flammenüberwachungsvorrichtung sowie eine Regeleinrichtung für den Brennerbetrieb.
Die Flammen sind je nach Bauart unterschiedlich. Es gibt sogenannte Freiflammen, von der Brenneroberfläche abhebende oder darauf aufsitzende Flammen, welche sich innerhalb, im Oberflächenbereich oder mit etwas Abstand außerhalb eines Flammenhalters bzw. einer Brenneroberfläche befinden.
Weiterhin sind verschiedene Flammenüberwachungsvorrichtungen bekannt, welche optisch, temperaturabhängig oder sogar akustisch in Flammennähe ein Signal generieren. Diese Signale müssen von der elektronischen Regeleinrichtung für den Brennerbetrieb verarbeitet werden. Insbesondere bei der optischen Flammenüberwachung beschränkte man sich bisher nur auf das Detektieren des Vorhandenseins einer Flamme mit Photozellen, -dioden, -transistoren und -widerständen. Da dabei nur zwischen hell und dunkel unterschieden wird, sind Aussagen zur Flammenqualität damit nicht möglich.
Insbesondere für atmosphärische oder vormischende Gasbrenner ist eine Überwachung des Abgasweges notwendig, um mögliche Blockaden oder unerwünschte Abgasemissionen schnell festzustellen. Speziell dafür sind Thermoelemente und Luftdruckschalter bekannt, also indirekte Methoden. Die zu beobachtenden Effekte bei einer Blockade des Abgasweges sind ein Anstieg von Kohlendioxidgehalt und Flammentemperatur. Auch die Flammenfarbe ändert sich dabei. Normalerweise, wenn die Verbrennungsqualität gut ist, ist die Flamme überwiegend blau. Jedoch verfärbt sich die Flamme über gelb und orange nach rot hin, wenn beispielsweise der Abgasweg blockiert ist.The invention relates to a method for monitoring a burner flame according to the preamble of claim 1. Furthermore, the invention relates to an arrangement for carrying out this method according to the preamble of claim 8. In combustion chambers of heaters come with gaseous, liquid or solid fuel-fired burner used. Essential components for such a combustion technology are a fuel supply, a combustion air duct, optionally with a combustion air or exhaust fan, a burner surface, an ignition device, a flame monitoring device and a burner control device.
The flames are different depending on the design. There are so-called free-flames, from the burner surface lifting or sitting on flames, which are located within, in the surface area or with some distance outside of a flame holder or a burner surface.
Furthermore, various flame monitoring devices are known which generate a signal optically, temperature-dependent or even acoustically close to the flame. These signals must be processed by the electronic control device for burner operation. In particular, optical flame monitoring has heretofore been limited to detecting the presence of a flame with photocells, diodes, transistors and resistors. Since only a distinction is made between light and dark, it is not possible to make any statements about the flame quality.
Especially for atmospheric or premixing gas burners monitoring of the exhaust path is necessary to quickly detect possible blockages or unwanted exhaust emissions. Especially for this purpose thermocouples and air pressure switches are known, ie indirect methods. The observed effects of blockage of the exhaust path are an increase in carbon dioxide content and flame temperature. The flame color changes as well. Usually, when the quality of combustion is good, the flame is mostly blue. However, the flame turns yellow and orange towards red when, for example, the exhaust path is blocked.

Mit der US 4,653,998 und der DE 3823494 A1 sind ein Verbrennungssystem und ein Verfahren zur Feuerdiagnose bekannt geworden, bei dem eine Flamme mittels eines Fotodetektors beobachte und das detektierte Licht spektral zerlegt und ausgewertet wird.With the US 4,653,998 and the DE 3823494 A1 For example, a combustion system and a method for fire diagnosis have become known in which a flame is observed by means of a photodetector and the detected light is spectrally decomposed and evaluated.

Der Erfindung liegt die Aufgabe zugrunde, bei einem mit gasförmigen, flüssigen oder festen Brennstoffen befeuerten Brenner die Betriebssicherheit und Feuerungsüberwachung, insbesondere im Hinblick auf mögliche Blockaden im Abgasweg und/oder erhöhte Abgasemissionen wegen mangelnder Verbrennungsqualität, zu optimieren.The object of the invention is to optimize the operational reliability and monitoring of firing in the case of a burner fired with gaseous, liquid or solid fuels, in particular with regard to possible blockages in the exhaust path and / or increased exhaust emissions due to a lack of combustion quality.

Erfindungsgemäß wird dies mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen.This is achieved with the features of claim 1 according to the invention. Advantageous developments can be found in the dependent claims.

Das Verfahren zum Überwachen einer Brennerflamme ist dadurch gekennzeichnet, dass die Flammenüberwachungsvorrichtung eine einen Teil des Farbspektrums des Flammenlichtes absorbierende Filtereinrichtung und einen dieser zugeordneten, mit der Regeleinrichtung verbundenen Photodetektor für gefiltertes Flammenlicht aufweist. Dabei wird das Flammenlicht auf direktem oder indirektem Weg in die Filtereinrichtung geleitet. Die Filtereinrichtung besteht aus einem Gehäuse mit einer eingefärbten, einen Teil des Farbspektrums des Flammenlichtes absorbierenden Innenwand und einem im Innenraum angebrachten, mit der Regeleinrichtung verbundenen Photodetektor für reflektiertes Flammenlicht.The method for monitoring a burner flame is characterized in that the flame monitoring device has a filter device which absorbs a part of the color spectrum of the flame light and a filtered-light photodetector associated therewith and connected to the control device. In this case, the flame light is passed directly or indirectly into the filter device. The filter device consists of a housing having a colored inner wall absorbing a part of the color spectrum of the flame light, and an interior-mounted reflective light-emitting photodetector connected to the control device.

In einer vorteilhaften Ausführungsvariante besteht die Filtereinrichtung aus einem einen Teil des Farbspektrums des Flammenlichtes absorbierenden Filter im direkten oder indirekten Weg des Flammenlichtes, so dass der Photodetektor gefiltertes Flammenlicht auswertet. Dabei wird das Flammenlicht auf direktem Weg über eine Durchbrechung in einer Gehäusewand oder über einen indirekten Weg, insbesondere über einen Lichtleiter, in den Innenraum geleitet.In an advantageous embodiment, the filter device consists of a part of the color spectrum of the flame light absorbing filter in the direct or indirect path of the flame light, so that the photodetector evaluates filtered flame light. In this case, the flame light is passed directly through an opening in a housing wall or via an indirect path, in particular via a light guide, into the interior.

Vorteilhafterweise ist der mit der Regeleinrichtung verbundene Photodetektor für gefiltertes Flammenlicht so im Innenraum des Gehäuses angebracht, dass dieser nicht von der direkten Einstrahlung beaufschlagt wird und dass nur das von der Innenwand reflektierte Flammenlicht zum Photodetektor gelangt. Dieser generiert ein Spannungssignal, welches in der Regeleinrichtung ausgewertet und insbesondere zur Ableitung eines Kohlendioxid- und/oder Luftverhältnisses verwendet wird. Niedrigere Spannungswerte kennzeichnen dabei den Normalbetrieb und höhere Spannungswerte stehen für unerwünschte Abweichungen, welche dann von der Software der Regeleinrichtung als Ausgangssignal beispielsweise eine Störung anzeigen.Advantageously, the connected to the control device photodetector for filtered flame light is mounted in the interior of the housing so that it is not acted upon by the direct irradiation and that only the light reflected from the inner wall of the flame light reaches the photodetector. This generates a voltage signal which is evaluated in the control device and used in particular for the derivation of a carbon dioxide and / or air ratio. Lower voltage values characterize the normal operation and higher voltage values stand for unwanted deviations, which are then used by the software of the control device as Output signal, for example, indicate a fault.

In einer weiteren bevorzugten Ausführungsform absorbiert die Filtereinrichtung, ausgehend von überwiegend blauem Flammenlicht im Normalbetrieb, besonders blaue und andere Farbanteile im Farbspektrum des Flammenlichtes, und reflektiert nur rote Farbanteile des Farbspektrums. Nur diese werden zum Photodetektor geleitet, so dass Abweichungen im Flammenlicht durch Verschiebung in orange und rote Farbanteile des Farbspektrums Abweichungen aus dem Normalbetrieb oder Störungen signalisieren. Ergänzend ist es vorteilhaft, wenn das mit dem Photodetektor generierte Spannungssignal in der Regeleinrichtung mit der jeweils aktuellen Brennerleistung verglichen und entsprechend nach vorgebbaren Stützwerten für Flammenlichtverhältnisse bei unterschiedlichen Brennerleistungen angepasst wird. Begründet ist dies damit, dass bekannte modulierende Geräte zumeist einen Bereich von etwa 25 % bis 100 % ihrer Nennleistung abdecken. Nach oben wird der Modulationsbereich unter anderem durch die sich einstellende Ausbrandhöhe des Gemischs begrenzt, die aus Emissionsgründen in jedem Fall kleiner als die Brennkammerhöhe sein muss. Diese Ausbrandhöhe ergibt sich aus dem Heizgasvolumenstrom, dem relevanten Brennerquerschnitt, der Luftzahl des Gas-Luft-Gemischs sowie dem Gegendruck in der Brennkammer. Dabei befindet sich die Flamme jeweils auch in unterschiedlichen Höhenbereichen zur Brenneroberfläche und kann unterschiedliche Färbungen annehmen. Genauso kann die temperaturabhängige Strahlungsintensität der Brenneroberfläche variieren. Sitzt die Flamme zum Beispiel auf, so kann die Brenneroberfläche glühen und entsprechend ebenso zum Flammenlicht beitragen. Daher soll das mit dem Photodetektor generierte Signal leistungsabhängig ausgeglichen werden, auch um unerwünschte Störungsmeldungen zu vermeiden, welche eventuell bei einem überhöhten Signal in speziellen normalen Betriebszuständen auftreten könnten.In a further preferred embodiment, the filter device, starting from predominantly blue flame light in normal operation, absorbs especially blue and other color components in the color spectrum of the flame light, and reflects only red color components of the color spectrum. Only these are led to the photodetector, so that deviations in the flame light by deviations in orange and red color portions of the color spectrum signal deviations from the normal operation or disturbances. In addition, it is advantageous if the voltage signal generated by the photodetector in the control device is compared with the respective current burner power and adjusted according to predefinable support values for flame light conditions at different burner powers. This is justified by the fact that known modulating devices usually cover a range of about 25% to 100% of their rated power. At the top, the modulation range is limited, inter alia, by the resulting combustion height of the mixture, which in any case must be smaller than the combustion chamber height for emission reasons. This burnout results from the Heizgasvolumenstrom, the relevant burner cross-section, the air ratio of the gas-air mixture and the back pressure in the combustion chamber. In this case, the flame is also in different height ranges to the burner surface and can assume different colors. Likewise, the temperature-dependent radiation intensity of the burner surface can vary. For example, if the flame gets stuck, the burner surface may glow and contribute to the flames as well. Therefore, the signal generated by the photodetector should be compensated depending on the power, also to avoid unwanted disturbance messages, which could possibly occur in an excessive signal in special normal operating conditions.

Die Anordnung zur Durchführung des vorstehend beschriebenen Verfahrens zum Überwachen einer Brennerflamme umfasst eine Flammenüberwachungsvorrichtung mit einer einen Teil des Farbspektrums des Flammenlichtes absorbierenden Filtereinrichtung und einem dieser zugeordneten, mit der Regeleinrichtung verbundenen Photodetektor für gefiltertes Flammenlicht.The arrangement for carrying out the above-described method for monitoring a burner flame comprises a flame monitoring device with a filter device which absorbs part of the color spectrum of the flame light and a filtered flame light photodetector associated therewith and connected to the control device.

Erfindungsgemäß wird somit bei einem mit gasförmigen, flüssigen oder festen Brennstoffen befeuerten Brenner die Betriebssicherheit und Feuerungsüberwachung optimiert. Insbesondere im Hinblick auf mögliche Blockaden im Abgasweg und/oder erhöhte Abgasemissionen wegen mangelnder Verbrennungsqualität wird eine sichere, schnelle und einfache Erkennung gewährleistet. Gegenüber den herkömmlichen indirekten Messungen mit Thermoelementen und Luftdruckschaltern wird erfindungsgemäß direkt das Flammenbild bzw. das Flammenlicht mit dem Photodetektor ausgewertet. Dabei ist die Reflektor-Oberfläche erfindungsgemäß in der Lage Wellenlängen auszublenden, welche nahe am roten Spektrum liegen.In accordance with the invention, the reliability and monitoring of firing is thus optimized in the case of a burner fired with gaseous, liquid or solid fuels. In particular with regard to possible blockages in the exhaust path and / or increased exhaust emissions due to lack of combustion quality is a safe, fast and easy detection guaranteed. Compared to the conventional indirect measurements with thermocouples and air pressure switches, the flame image or the flame light is directly evaluated according to the invention with the photodetector. The reflector surface according to the invention is able to hide wavelengths which are close to the red spectrum.

Die Zeichnung stellt ein Ausführungsbeispiel der Erfindung dar. Es zeigt jeweils den schematischen Aufbau eines erfindungsgemäßen Verfahrens / einer erfindungsgemäßen Anordnung zum Überwachen einer Brennerflamme mit einer ein Gehäuse als Filtereinrichtung aufweisenden Flammenüberwachungsvorrichtung:

  • Fig. 1: mit einer Durchbrechung in einer Gehäusewand,
  • Fig. 2: mit einem Lichtleiter zur indirekten Weiterleitung des Flammenlichtes,
  • Fig. 3: mit einem Filter im direkten Weg des Flammenlichtes zum Photodetektor.
The drawing shows an embodiment of the invention. It shows in each case the schematic structure of a method / an inventive arrangement for monitoring a burner flame with a housing having a filter device having flame monitoring device:
  • Fig. 1 with an opening in a housing wall,
  • Fig. 2 with a light guide for the indirect transmission of the flame light,
  • Fig. 3 : with a filter in the direct path of the flame light to the photodetector.

Die Anordnung zur Durchführung des Verfahrens zum Überwachen einer Brennerflamme für einen mit gasförmigen, flüssigen oder festen Brennstoffen befeuerten Brenner 1 in einer umgebenden Brennkammer 2 besteht im Wesentlichen aus einer Regeleinrichtung 3 für den Brennerbetrieb sowie einer Flammenüberwachungsvorrichtung 4.The arrangement for carrying out the method for monitoring a burner flame for a burner 1 fired with gaseous, liquid or solid fuels in a surrounding combustion chamber 2 consists essentially of a control device 3 for burner operation and a flame monitoring device 4.

Die Flammenüberwachungsvorrichtung 4 weist eine einen Teil des Farbspektrums des Flammenlichtes absorbierende Filtereinrichtung 5 und einen dieser zugeordneten, mit der Regeleinrichtung 3 verbundenen Photodetektor 6 für gefiltertes Flammenlicht auf.The flame monitoring device 4 has a filter device 5 which absorbs a part of the color spectrum of the flame light and a filtered-light photodetector 6 associated therewith and connected to the control device 3.

Die Filtereinrichtung 5 in Fig. 1 und Fig. 2 besteht aus einem Gehäuse mit einer eingefärbten, einen Teil des Farbspektrums des Flammenlichtes absorbierenden Innenwand und dem in dessen Innenraum angebrachten Photodetektor 6 für im Inneren reflektiertes Flammenlicht.The filter device 5 in Fig. 1 and Fig. 2 consists of a housing with a colored inner wall absorbing a part of the color spectrum of the flame light and the photodetector 6 mounted in the interior of the latter for internal flame light.

Gemäß Fig. 1 wird das Flammenlicht auf direktem Weg über eine Durchbrechung 7 in einer Gehäusewand oder gemäß Fig. 2 über einen indirekten Weg, insbesondere über einen Lichtleiter 8, in den Innenraum geleitet. Dabei ist der Photodetektor 6 für gefiltertes Flammenlicht so im Innenraum des Gehäuses angebracht, dass nur das von der Innenwand reflektierte und somit gefilterte Flammenlicht zum Photodetektor 6 gelangt.According to Fig. 1 is the flame light on a direct path through an opening 7 in a housing wall or according to Fig. 2 via an indirect path, in particular via a light guide 8, passed into the interior. In this case, the filtered-flame photodetector 6 is mounted in the interior of the housing such that only the flame light reflected and thus filtered by the inner wall reaches the photodetector 6.

Die Filtereinrichtung 5 in Fig. 3 besteht aus einem teilweise durchscheinenden Filterelement, beispielsweise einem Glas, das Teilbereiche des Flammenlichtspektrums absorbiert, andere Teilbereiche des Spektrums hindurchleitet. Das Flammenlicht erreicht die Filtereinrichtung 5 über eine Durchbrechung in einer Wand der Brennkammer 2. In Strahlungsrichtung hinter dem Filterelement ist der Photodetektor 6 angeordnet, der das durch den Filter hindurchtretende Licht detektiert und ein entsprechendes Signal an die Regeleinrichtung 3 weitergibt.The filter device 5 in Fig. 3 consists of a partially translucent filter element, such as a glass, which absorbs portions of the flame spectrum, passes other portions of the spectrum. The flame light reaches the filter device 5 via an opening in a wall of the combustion chamber 2. In the radiation direction behind the filter element, the photodetector 6 is arranged, which detects the light passing through the filter and transmits a corresponding signal to the control device 3.

Claims (8)

  1. Method for monitoring a burner flame for a burner (1) which is fired with gaseous, liquid or solid fuels, for use in a combustion chamber (2) of a heater, having a fuel feed and a combustion air duct, optionally with a combustion air blower or exhaust gas blower, a burner surface, an ignition device, a flame-monitoring device (4) and a regulating apparatus (3) for the burner operation, wherein the flame-monitoring device (4) has a filter device (5) which absorbs a portion of the colour spectrum of the flame light and a photodetector (6), assigned thereto and connected to the regulating device (3), for filtered flame light, wherein the flame light is directed into the filter apparatus (5) on a direct or indirect path, characterized in that filter apparatus (5) is composed of a housing with a coloured-in internal wall which absorbs a portion of the coloured spectrum of the flame light and with a photodetector (6), mounted in the interior and connected to the regulating device (3), for reflected flame light.
  2. Method according to Claim 1,
    characterized in that the filter apparatus (5) is composed of a filter which absorbs a portion of the colour spectrum of the flame light, in the direct or indirect path of the flame light to the photodetector (6) for filtered flame light.
  3. Method according to Claim 1 or 2,
    characterized in that the flame light is directed into the interior on a direct path via a breakthrough (7) in a housing wall or via an indirect path, in particular via a light guide (8).
  4. Method according to one of Claims 1 to 3,
    characterized in that the photodetector (6), connected to the regulating apparatus (3), for filtered flame light is mounted in the interior of the housing in such a way that only the flame light which is reflected by the internal wall arrives at the photodetector (6).
  5. Method according to one of Claims 2 to 4,
    characterized in that the photodetector (6) for filtered flame light generates a voltage signal which is evaluated in the regulating apparatus (3) and is used, in particular, for driving a carbon dioxide ratio and/or air ratio, wherein relatively low voltage values represent normal operation and relatively high voltage values represent divergences.
  6. Method according to one of Claims 1 to 5,
    characterized in that, taking a predominantly blue light as the basis, the filter apparatus (5) absorbs, during normal operation, particularly blue colour portions and other colour portions in the colour spectrum of the flame light and reflects red colour portions of the colour spectrum and directs them to the photodetector (6), with the result that divergences in the flame light as a result of shifting into orange colour portions and red colour portions of the colour spectrum signal divergences from the normal operation or faults.
  7. Method according to one of Claims 1 to 6,
    characterized in that the voltage signal which is generated with the photodetector (6) is compared in the regulating apparatus (3) with the respective current burner performance and is correspondingly adapted according to predefined reference values for flame light conditions for different burner performance levels.
  8. Arrangement for carrying out the method for monitoring a burner flame for a burner (1) which is fired with gaseous, liquid or solid fuels, for use in a combustion chamber (2) of a heater, having a fuel feed and a combustion air duct, optionally with a combustion air blower or exhaust gas blower, a burner surface, an ignition device, a flame-monitoring device (4) and a regulating apparatus (3) for the burner operation, wherein the flame-monitoring device (4) has a filter device (5) which absorbs a portion of the colour spectrum of the flame light and a photodetector (6), assigned thereto and connected to the regulating device (3), for filtered flame light, wherein the flame light is directed into the filter apparatus (5) on a direct or indirect path, characterized in that filter apparatus (5) is composed of a housing with a coloured-in internal wall which absorbs a portion of the coloured spectrum of the flame light and with a photodetector (6), mounted in the interior and connected to the regulating device (3), for reflected flame light.
EP12724599.1A 2011-05-30 2012-05-23 Method for monitoring a burner flame Not-in-force EP2715236B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2011/05258A TR201105258A2 (en) 2011-05-30 2011-05-30 Method and apparatus for controlling a burner flame.
PCT/EP2012/059573 WO2012163754A1 (en) 2011-05-30 2012-05-23 Method for monitoring a burner flame

Publications (2)

Publication Number Publication Date
EP2715236A1 EP2715236A1 (en) 2014-04-09
EP2715236B1 true EP2715236B1 (en) 2018-02-28

Family

ID=46197243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12724599.1A Not-in-force EP2715236B1 (en) 2011-05-30 2012-05-23 Method for monitoring a burner flame

Country Status (3)

Country Link
EP (1) EP2715236B1 (en)
TR (1) TR201105258A2 (en)
WO (1) WO2012163754A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022123091A1 (en) 2022-09-12 2024-03-14 Vaillant Gmbh Method for operating a heater, computer program, control and control device and heater

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159515A (en) * 1984-01-27 1985-08-21 Hitachi Ltd Furnace system
DE3823494C2 (en) * 1988-07-11 1997-11-27 En Versorgung Schwaben Ag Method and device for furnace diagnosis and furnace control using the results thereof
US5037291A (en) * 1990-07-25 1991-08-06 Carrier Corporation Method and apparatus for optimizing fuel-to-air ratio in the combustible gas supply of a radiant burner
US5125739A (en) * 1991-01-14 1992-06-30 United Technologies Corporation Triple spectral area pyrometer

Also Published As

Publication number Publication date
WO2012163754A1 (en) 2012-12-06
EP2715236A1 (en) 2014-04-09
TR201105258A2 (en) 2012-12-21

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