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EP1707881A1 - Method for monitoring the combustion of a burner - Google Patents

Method for monitoring the combustion of a burner Download PDF

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Publication number
EP1707881A1
EP1707881A1 EP05028650A EP05028650A EP1707881A1 EP 1707881 A1 EP1707881 A1 EP 1707881A1 EP 05028650 A EP05028650 A EP 05028650A EP 05028650 A EP05028650 A EP 05028650A EP 1707881 A1 EP1707881 A1 EP 1707881A1
Authority
EP
European Patent Office
Prior art keywords
quotient
determined
divisor
burner
supplied
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05028650A
Other languages
German (de)
French (fr)
Inventor
Urs LÜTHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garrett Motion SARL
Original Assignee
Honeywell Technologies SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Technologies SARL filed Critical Honeywell Technologies SARL
Publication of EP1707881A1 publication Critical patent/EP1707881A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1431—Controller structures or design the system including an input-output delay
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/30—Pumps

Definitions

  • the invention relates to a method for monitoring a combustion process of a burner, such as a modulating premix oil burner.
  • Premix oil burners have a liquid fuel mixture preparation system which evaporates the fuel and subsequently mixes it with combustion air. If such a modulating oil burner is used in conjunction with a condensing boiler, the monitoring of the amount of air supplied is of particular importance.
  • the invention is intended to specify a method which allows a particularly good monitoring of the combustion process of a burner.
  • a quotient of two predetermined parameters of the combustion process is formed and the value of the quotient is determined. It is then checked whether the value of the quotient lies within a predetermined range and outputs a detection signal corresponding to the result of this test.
  • the dividend of the quotient is a parameter that depends on the amount of fuel supplied.
  • a parameter for example, the frequency of an output signal or drive signal of a specific volume per pulse promotional oil pump can be determined.
  • a parameter can be used that depends on the amount of air supplied.
  • the amount of air supplied can be determined by radicalizing the overpressure of the amount of air supplied.
  • the overpressure in turn can be determined, for example, with the aid of a pressure sensor which is arranged in the air flow of the supplied air after a fan and before a mixing device.
  • the divisor of the quotient can also be determined by means of the speed of a blower motor of the blower.
  • the quotient underlying the detection signal is determined continuously with the aid of a microprocessor. Accordingly, the detection signal is continuously output and thus always indicates the current state of the combustion process.
  • the parameter relating to the dividends is forwarded to the microprocessor with a predetermined delay.
  • E denotes a recognition device which can be formed, for example, by a microprocessor.
  • This detection device E two signals are supplied.
  • the first signal is an air pressure signal P of an analog pressure sensor.
  • the second signal is pulses of a drive signal of a volumetric oil pump with the frequency F.
  • the detection device E determines from the first signal information about the amount of air supplied to the combustion process and from the second signal information about the amount of fuel supplied to the combustion process.
  • the recognition device E forms a quotient from these two pieces of information and checks whether this quotient lies within a predetermined range.
  • the predetermined area may also cover a plurality of portions that do not necessarily hang together.
  • the recognition device furthermore has a digital output A. If the recognition device concludes that the quotient lies within the predetermined range, it outputs a logical "1", otherwise a logical "0".
  • the detection device correspondingly delays the signal supplied to a second input in order to allow an exact allocation of the parameters of the combustion process.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

The method for monitoring combustion in burners, e.g. premix oil burners, comprises: (A) evaluating the quotient of two parameters related to the progress of combustion; (B) determining if this value lies in a desired range; and (C) producing a signal which indicates if this is so or not. The dividend of the quotient is related to the amount of fuel fed to the burner and the divisor is related to the amount of air fed to it. An independent claim is included for apparatus for carrying out the method.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Überwachung eines Verbrennungsvorganges eines Brenners, wie beispielsweise eines modulierenden Premix-Ölbrenners.The invention relates to a method for monitoring a combustion process of a burner, such as a modulating premix oil burner.

Premix-Ölbrenner verfügen über ein Gemischaufbereitungssystem für flüssige Brennstoffe, bei dem eine Verdampfung des Brennstoffes erfolgt und nachfolgend eine Mischung mit Verbrennungsluft durchgeführt wird. Wird ein solcher modulierender Ölbrenner im Zusammenhang mit einem Brennwert-Kessel eingesetzt, ist die Überwachung der zugeführten Luftmenge von besonderer Bedeutung.Premix oil burners have a liquid fuel mixture preparation system which evaporates the fuel and subsequently mixes it with combustion air. If such a modulating oil burner is used in conjunction with a condensing boiler, the monitoring of the amount of air supplied is of particular importance.

Die Erfindung soll ein Verfahren angeben, das eine besonders gute Überwachung des Verbrennungsvorganges eines Brenners ermöglicht.The invention is intended to specify a method which allows a particularly good monitoring of the combustion process of a burner.

Diese Aufgabe wird mittels eines Verfahrens gemäß dem Patentanspruch 1 gelöst.This object is achieved by means of a method according to the patent claim 1.

Bei dem Verfahren wird ein Quotient aus zwei vorbestimmten Parametern des Verbrennungsvorganges gebildet und der Wert des Quotienten bestimmt. Dann wird geprüft, ob der Wert des Quotienten in einem vorbestimmten Bereich liegt und ein dem Ergebnis dieser Prüfung entsprechendes Erkennungssignal ausgegeben.In the method, a quotient of two predetermined parameters of the combustion process is formed and the value of the quotient is determined. It is then checked whether the value of the quotient lies within a predetermined range and outputs a detection signal corresponding to the result of this test.

Durch diese Vorgehensweise kann auf sehr einfache Art und Weise eine äußerst genaue Überwachung eines Verbrennungsvorganges eines Brenners ermöglicht werden.By doing so, a highly accurate monitoring of a combustion process of a burner can be made possible in a very simple manner.

Als Dividend des Quotienten wird ein Parameter verwendet, der von der zugeführten Brennstoffmenge abhängt. Als Parameter kann hierfür beispielsweise die Frequenz eines Ausgangssignals oder Ansteuersignals einer ein bestimmtes Volumen pro Impuls fördernden Ölpumpe bestimmt werden.The dividend of the quotient is a parameter that depends on the amount of fuel supplied. As a parameter, for example, the frequency of an output signal or drive signal of a specific volume per pulse promotional oil pump can be determined.

Als Divisor des Quotienten kann ein Parameter verwendet werden, der von der zugeführten Luftmenge abhängt. Die zugeführte Luftmenge kann durch radizieren des Überdruckes der zugeführten Luftmenge ermittelt werden. Der Überdruck wiederum kann beispielsweise mit Hilfe eines Drucksensors ermittelt werden, der im Luftstrom der zugeführten Luft nach einem Gebläse und vor einer Mischeinrichtung angeordnet ist.As a divisor of the quotient, a parameter can be used that depends on the amount of air supplied. The amount of air supplied can be determined by radicalizing the overpressure of the amount of air supplied. The overpressure in turn can be determined, for example, with the aid of a pressure sensor which is arranged in the air flow of the supplied air after a fan and before a mixing device.

Alternativ kann der Divisor des Quotienten auch mit Hilfe der Drehzahl eines Gebläsemotors des Gebläses bestimmt werden.Alternatively, the divisor of the quotient can also be determined by means of the speed of a blower motor of the blower.

Vorteilhafter Weise wird der dem Erkennungssignal zu Grunde liegende Quotient mit Hilfe eines Mikroprozessors kontinuierlich bestimmt. Dementsprechend wird auch das Erkennungssignal kontinuierlich ausgegeben und zeigt somit stets den aktuellen Zustand des Verbrennungsvorganges an.Advantageously, the quotient underlying the detection signal is determined continuously with the aid of a microprocessor. Accordingly, the detection signal is continuously output and thus always indicates the current state of the combustion process.

Da aber ein Verdampfen des Brennstoffes mit einem gewissen zeitlichen Aufwand verbunden ist, kann es von Vorteil sein, wenn der den Dividenden betreffende Parameter mit einer vorbestimmten Verzögerung an den Mikroprozessor weitergegeben wird.However, since evaporation of the fuel involves a certain amount of time, it may be advantageous if the parameter relating to the dividends is forwarded to the microprocessor with a predetermined delay.

Ebenfalls ergeben sich bauliche Einsparungen, wenn zur Bestimmung des Quotienten ein Mikroprozessor verwendet wird, der ohnehin Bestandteil der Steuereinrichtung des Brenners ist.Structural savings also result if a microprocessor is used to determine the quotient, which is already part of the control device of the burner anyway.

Die Erfindung wird nachfolgend anhand der Figur erläutert.The invention will be explained below with reference to the figure.

In der Figur ist mit E eine Erkennungseinrichtung gekennzeichnet, die beispielsweise durch einen Mikroprozessor gebildet werden kann. Dieser Erkennungseinrichtung E werden zwei Signale zugeführt.In the figure, E denotes a recognition device which can be formed, for example, by a microprocessor. This detection device E, two signals are supplied.

Das erste Signal ist ein Luftdrucksignal P eines analogen Drucksensors. Bei dem zweiten Signal handelt es sich um Impulse eines Ansteuersignals einer volumetrischen Ölpumpe mit der Frequenz F.The first signal is an air pressure signal P of an analog pressure sensor. The second signal is pulses of a drive signal of a volumetric oil pump with the frequency F.

Die Erkennungseinrichtung E bestimmt aus dem ersten Signal eine Information über die dem Verbrennungsvorgang zugeführte Luftmenge und aus dem zweiten Signal eine Information über die dem Verbrennungsvorgang zugeführte Brennstoffmenge. Die Erkennungseinrichtung E bildet aus diesen beiden Informationen einen Quotienten und überprüft, ob dieser Quotient in einem vorbestimmten Bereich liegt. Der vorbestimmte Bereich kann auch mehrere Teilbereiche erfassen, die nicht notwendigerweise zusammen hängen.The detection device E determines from the first signal information about the amount of air supplied to the combustion process and from the second signal information about the amount of fuel supplied to the combustion process. The recognition device E forms a quotient from these two pieces of information and checks whether this quotient lies within a predetermined range. The predetermined area may also cover a plurality of portions that do not necessarily hang together.

Die Erkennungseinrichtung verfügt des weiteren über einen digitalen Ausgang A. Kommt die Erkennungseinrichtung zu dem Ergebnis, dass der Quotient in dem vorbestimmten Bereich liegt, gibt sie eine logische "1" aus, anderenfalls eine logische "0".The recognition device furthermore has a digital output A. If the recognition device concludes that the quotient lies within the predetermined range, it outputs a logical "1", otherwise a logical "0".

Üblicherweise beansprucht die Verdampfung des Brennstoffes eine gewisse Zeit. Aus diesem Grund kann vorgesehen sein, dass die Erkennungseinrichtung das einem zweiten Eingang zugeführte Signal dementsprechend zeitlich verzögert um eine genaue Zuordnung der Parameter des Verbrennungsprozesses zu ermöglichen.Usually, the evaporation of the fuel takes some time. For this reason, it can be provided that the detection device correspondingly delays the signal supplied to a second input in order to allow an exact allocation of the parameters of the combustion process.

Mittels dem gezeigten Verfahren kann mittels der gezeigten Einrichtung auf einfache Art und Weise eine genaue Überwachung eines Verbrennungsvorganges eines Brenners erfolgen.By means of the method shown, a precise monitoring of a combustion process of a burner can be carried out by means of the device shown in a simple manner.

Claims (14)

Verfahren zur Überwachung eines Verbrennungsvorganges eines Brenners, bei dem (a) ein Quotient aus zwei vorbestimmten Parametern des Verbrennungsvorganges gebildet wird und der Wert des Quotienten bestimmt wird, (b) geprüft wird, ob der Wert des Quotienten in einem vorbestimmten Bereich liegt, und (c) ein Erkennungssignal ausgegeben wird, das angibt, ob der Wert des Quotienten in einem vorbestimmten Bereich liegt oder nicht. Method for monitoring a combustion process of a burner, in which (a) a quotient of two predetermined parameters of the combustion process is formed and the value of the quotient is determined, (b) checking whether the value of the quotient is in a predetermined range, and (c) outputting a detection signal indicating whether the value of the quotient is within a predetermined range or not. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Dividend des Quotienten ein Parameter verwendet wird, der von der zugeführten Brennstoffmenge abhängt.A method according to claim 1, characterized in that the dividend of the quotient, a parameter is used, which depends on the amount of fuel supplied. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Divisor des Quotienten ein Parameter verwendet wird, der von der zugeführten Luftmenge abhängt.A method according to claim 1, characterized in that as a divisor of the quotient, a parameter is used, which depends on the amount of air supplied. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Divisor des Quotienten ein Parameter verwendet wird, der vom Überdruck der zugeführten Luft abhängt.A method according to claim 1, characterized in that as a divisor of the quotient, a parameter is used, which depends on the overpressure of the supplied air. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Divisor des Quotienten aus der Frequenz eines Ausgangssignals oder Ansteuersignals einer ein bestimmtes Volumen pro Impuls fördernden Ölpumpe bestimmt wird.A method according to claim 1, characterized in that the divisor of the quotient of the frequency of an output signal or drive signal of a certain volume per pulse promotional oil pump is determined. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Divisor des Quotienten mit Hilfe eines durch den Luftstrom bestimmten Drucksignals eines Drucksensors bestimmt wird.A method according to claim 1, characterized in that the divisor of the quotient with the aid of a determined by the air flow pressure signal of a pressure sensor is determined. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Divisor des Quotienten mit Hilfe der Drehzahl eines Gebläsemotors bestimmt wird.A method according to claim 1, characterized in that the divisor of the quotient with the aid of the rotational speed of a fan motor is determined. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Divisor des Quotienten aus der Wurzel des Überdruckes der zugeführten Luft bestimmt wird.A method according to claim 1, characterized in that the divisor of the quotient of the root of the overpressure of the supplied air is determined. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Quotient kontinuierlich bestimmt und das Erkennungssignal kontinuierlich ausgegeben wird.A method according to claim 1, characterized in that the quotient is determined continuously and the detection signal is output continuously. Vorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Quotient mit Hilfe eines Mikroprozessors gebildet wird.Device for carrying out the method according to one of the preceding claims, characterized in that the quotient is formed by means of a microprocessor. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der Mikroprozessor Bestandteil einer Steuereinrichtung des Brenners ist.Apparatus according to claim 10, characterized in that the microprocessor is part of a control device of the burner. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der Drucksensor zur Abgabe des Drucksignals in Strömungsrichtung der zugeführten Luft nach einem Gebläse und vor einer Mischeinrichtung angeordnet ist, in der die zugeführte Luft mit dem zugeführten Brennstoff vermischt wird.Apparatus according to claim 10, characterized in that the pressure sensor for emitting the pressure signal in the flow direction of the supplied air to a fan and in front of a mixing device is arranged, in which the supplied air is mixed with the supplied fuel. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der Brenner durch einen modulierenden Premix-Ölbrenner gebildet wird.Apparatus according to claim 10, characterized in that the burner is formed by a modulating premix oil burner. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der den Dividenden betreffende Parameter mit einer vorbestimmten zeitlichen Verzögerung berücksichtigt wird.Apparatus according to claim 10, characterized in that the parameter relating to the dividends is taken into account with a predetermined time delay.
EP05028650A 2005-03-23 2005-12-29 Method for monitoring the combustion of a burner Withdrawn EP1707881A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005013546A DE102005013546A1 (en) 2005-03-23 2005-03-23 Monitoring combustion in e.g. premix oil burners comprises evaluating quotient of two parameters related to progress of combustion, determining if this value lies in desired range and producing signal indicating if this is so or not

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EP1707881A1 true EP1707881A1 (en) 2006-10-04

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EP05028650A Withdrawn EP1707881A1 (en) 2005-03-23 2005-12-29 Method for monitoring the combustion of a burner

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58142115A (en) * 1982-02-18 1983-08-23 Toshiba Corp Controller for boiler
JPH04165208A (en) * 1990-10-30 1992-06-11 Babcock Hitachi Kk Burner
US6098013A (en) * 1998-05-11 2000-08-01 Caterpillar Inc. System and method for monitoring exhaust gas hydrocarbon content in internal combustion engines
US20020129609A1 (en) * 1999-12-01 2002-09-19 Capstone Turbine Corporation System and method for modular control of a multi-fuel low emissions turbogenerator
EP1413730A1 (en) * 2002-10-23 2004-04-28 Toyota Jidosha Kabushiki Kaisha Apparatus and method for estimating intake air flow amount of internal combustion engine
DE10251816A1 (en) * 2002-04-16 2004-05-13 Rolf Kresel Gas burner for boiler has burner plate insulated from lower casing and elastically connected to it
US20040200206A1 (en) * 2002-03-20 2004-10-14 Mckelvey Terrence Gas turbine apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614048A1 (en) * 1993-03-05 1994-09-07 Landis & Gyr Technology Innovation AG Device with automatic burner
EP0614051B1 (en) * 1993-03-05 1997-03-05 Landis & Gyr Technology Innovation AG Burner automat

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58142115A (en) * 1982-02-18 1983-08-23 Toshiba Corp Controller for boiler
JPH04165208A (en) * 1990-10-30 1992-06-11 Babcock Hitachi Kk Burner
US6098013A (en) * 1998-05-11 2000-08-01 Caterpillar Inc. System and method for monitoring exhaust gas hydrocarbon content in internal combustion engines
US20020129609A1 (en) * 1999-12-01 2002-09-19 Capstone Turbine Corporation System and method for modular control of a multi-fuel low emissions turbogenerator
US20040200206A1 (en) * 2002-03-20 2004-10-14 Mckelvey Terrence Gas turbine apparatus
DE10251816A1 (en) * 2002-04-16 2004-05-13 Rolf Kresel Gas burner for boiler has burner plate insulated from lower casing and elastically connected to it
EP1413730A1 (en) * 2002-10-23 2004-04-28 Toyota Jidosha Kabushiki Kaisha Apparatus and method for estimating intake air flow amount of internal combustion engine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 261 (M - 257) 19 November 1983 (1983-11-19) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 464 (M - 1316) 28 September 1992 (1992-09-28) *

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