EP0890791A1 - Control device for a burner - Google Patents

Control device for a burner Download PDF

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Publication number
EP0890791A1
EP0890791A1 EP97112024A EP97112024A EP0890791A1 EP 0890791 A1 EP0890791 A1 EP 0890791A1 EP 97112024 A EP97112024 A EP 97112024A EP 97112024 A EP97112024 A EP 97112024A EP 0890791 A1 EP0890791 A1 EP 0890791A1
Authority
EP
European Patent Office
Prior art keywords
motor
burner
fuel
fan
control
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Withdrawn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
EP97112024A
Other languages
German (de)
French (fr)
Inventor
Hans Link
Jürgen Paul
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.)
Electrowatt Technology Innovation AG
Original Assignee
Electrowatt Technology Innovation AG
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 Electrowatt Technology Innovation AG filed Critical Electrowatt Technology Innovation AG
Priority to EP97112024A priority Critical patent/EP0890791A1/en
Publication of EP0890791A1 publication Critical patent/EP0890791A1/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Withdrawn legal-status Critical Current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
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems 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
    • F23N2227/02—Starting or ignition cycles
    • 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
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • the invention relates to a control and regulating device for a burner in the preamble of claim 1 Art.
  • Such control devices are used, for example, for commissioning and for controlling the Normal operation of heating devices of variable output, in which the amount of the Combustion fuel and the amount of air supplied for combustion varies become.
  • the air is supplied by means of a fan, which is driven by a speed-controllable motor is driven.
  • a gas burner With a gas burner, the amount of gas is controlled by a motor-driven flap
  • the amount of oil supplied is controlled by a motor-driven oil pressure regulator controlled.
  • the control and regulation device ensures an optimal fuel-air ratio, whereby it directly the blower motor and the motor-driven flap or the motor-driven oil pressure regulator controls.
  • the invention has for its object to propose a control device for a burner, in which the fuel-air ratio is regulated in such a way that as little as possible during combustion Pollutants arise and as little warm air as possible escapes through the fireplace.
  • Fig. 1 shows a control and regulating device 1 for a burner 2.
  • the fuel is a Fuel line 3 fed to the combustion chamber 4, the amount of fuel from the control and Control device 1 is controlled by means of an actuator 5.
  • Actuator 5 is a motor-driven flap, the position of which controls the gas flow.
  • the burner 2 is on Oil burner, then the actuator 5 is a motor-driven oil pressure regulator.
  • One of a speed controllable Motor 6 driven fan 7 delivers air into the combustion chamber 4.
  • the motor 6 is For example, a DC motor, the speed of which is controlled by a control device 1 emitted pulse width modulated signal is controlled.
  • a motor 6 can also be one of one Frequency converter controlled AC motor can be used.
  • a sensor 8 serves as a means for Detection of the speed of the fan 7.
  • the sensor 8 is, for example, one on the motor 6 with the Fan 7 connecting shaft attached tachometer generator.
  • a Hall element can also be used as the sensor 8 or serve a light barrier.
  • An external or a heating circuit controller 9 integrated in the control and regulating device 1 shares the control and Control unit 1 with the burner output required to cover the heat requirement.
  • the control and regulating device 1 controls the continuously variable speed of the Blower motor 6.
  • the control and regulating device 1 continuously detects the current one Speed of the fan 7 and performs the position of the actuator 5 such the current speed after that the amount of fuel delivered and the air volume flow a for the Combustion optimal fuel-air mixture result.
  • the burner 2 is therefore air-guided.
  • FIG. 2 shows a diagram with the conveyed air volume flow V and the conveyed fuel B as a function of time t.
  • the control and regulating device 1 gives the blower motor 6 (FIG. 1) the command to set the speed of rotation of a value N 1 of, for example, 1200 rpm due to an abruptly increased heat requirement. to a value N 2 of 1950 rpm. to increase.
  • the time ⁇ required for this is typically a few 100 milliseconds to a few seconds.
  • the control and regulating device 1 interrogates the sensor 8 and determines the instantaneous speed of the blower 7 and the position of the actuator 5 associated with the instantaneous speed from the signal from the sensor 8 changed in the last query, the control and regulating device 1 issues the actuating element 5 with the actuating command to also change its position to the newly determined value. While the air volume flow changes continuously, as can be seen in the diagram, the amount of fuel is gradually adjusted in small steps.
  • the dotted line 10 shows, for comparison, the time course of the amount of fuel delivered, when the command to change the air amount and the fuel amount to the blower motor 6 or the actuator 5 according to the prior art takes place at once. Since the actuator 5 its new Position reaches its new speed much faster than the blower 7 becomes too much fuel for some time promoted in the combustion chamber 4.
  • the tracking of the actuator 5 according to the current speed of the air blower 7 offers In terms of safety, the advantage that if the speed drops, e.g. because with a three-phase driven AC motor suddenly fails a phase, including the amount of fuel delivered is immediately reduced.

Abstract

The automatic control equipment (1) is for a burner (2) with a combustion chamber (4). Fuel is supplied to the combustion chamber by a motor operated regulating valve (5). Combustion air is supplied by a fan (7). The fan is driven by a variable speed motor (6). A sensor (8) detects the instantaneous speed of the fan and provides a signal which initiates any correction of the position of the regulating valve required.

Description

Die Erfindung betrifft ein Steuer- und Regelgerät für einen Brenner der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a control and regulating device for a burner in the preamble of claim 1 Art.

Solche Steuer- und Regelgeräte werden beispielsweise zur Inbetriebsetzung und zur Steuerung des Normalbetriebs von Heizungseinrichtungen variabler Leistung, bei denen die Menge des zur Verbrennung gelangenden Brennstoffes und die Menge der zur Verbrennung zugeführten Luft variiert werden. Die Luft wird dabei mittels eines Gebläses zugeführt, das von einem drehzahlsteuerbaren Motor angetrieben wird. Bei einem Gasbrenner wird die Gasmenge über eine motorgetriebene Klappe gesteuert, bei einem Ölbrenner wird die zugeführte Ölmenge mittels eines motorgetriebenen Öldruckreglers gesteuert. Das Steuer- und Regelgerät sorgt für ein optimales Brennstoff-Luft-Verhältnis, wobei es den Gebläsemotor und die motorgetriebene Klappe bzw. den motorgetriebenen Öldruckregler direkt ansteuert.Such control devices are used, for example, for commissioning and for controlling the Normal operation of heating devices of variable output, in which the amount of the Combustion fuel and the amount of air supplied for combustion varies become. The air is supplied by means of a fan, which is driven by a speed-controllable motor is driven. With a gas burner, the amount of gas is controlled by a motor-driven flap In an oil burner, the amount of oil supplied is controlled by a motor-driven oil pressure regulator controlled. The control and regulation device ensures an optimal fuel-air ratio, whereby it directly the blower motor and the motor-driven flap or the motor-driven oil pressure regulator controls.

Es hat sich herausgestellt, dass das aus dem Gebläse, dem Gebläsemotor und dem den Gebläsemotor beaufschlagenden Drehzahlstellers bestehende System um einiges träger auf Stellbefehle reagiert als ein Brennstoffregler. Es dauert daher unterschiedlich lange, bis das Gebläse und der Brennstoffregler jeweils ihren neuen Sollwert erreicht haben. Nachteilig dabei ist, dass bei jeder Leistungsverstellung das Brennstoff-Luft-Verhältnis vorübergehend nicht optimal ist, so dass entweder zusätzliche Schadstoffe im Abgas entstehen oder ungenutzte Wärme durch den Kamin entweicht.It has been found that this consists of the blower, the blower motor and the blower motor Acting speed controller existing system reacts much slower to control commands than a Fuel regulator. It therefore takes different lengths of time for the blower and the fuel regulator each have reached their new setpoint. The disadvantage here is that with every performance adjustment The air-fuel ratio is temporarily not optimal, so either additional pollutants in the exhaust gas or unused heat escapes through the chimney.

Der Erfindung liegt die Aufgabe zugrunde, ein Steuer- und Regelgerät für einen Brenner vorzuschlagen, bei dem das Brennstoff-Luft-Verhältnis derart geregelt ist, dass bei der Verbrennung möglichst wenig Schadstoffe entstehen und möglichst wenig warme Luft durch den Kamin entweicht.The invention has for its object to propose a control device for a burner, in which the fuel-air ratio is regulated in such a way that as little as possible during combustion Pollutants arise and as little warm air as possible escapes through the fireplace.

Die genannte Aufgabe wird erfindungsgemäss gelöst durch die Merkmale des Anspruchs 1.According to the invention, the stated object is achieved by the features of claim 1.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Es zeigen:

Fig. 1
ein Steuer- und Regelgerät für einen luftgeführten Brenner, und
Fig. 2
ein Diagramm, das das Prinzip der Luftführung veranschaulicht.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it:
Fig. 1
a control and regulating device for an air-guided burner, and
Fig. 2
a diagram illustrating the principle of air flow.

Die Fig. 1 zeigt ein Steuer- und Regelgerät 1 für einen Brenner 2. Der Brennstoff wird über eine Brennstoffleitung 3 der Brennkammer 4 zugeführt, wobei die Menge des Brennstoffes vom Steuer- und Regelgerät 1 mittels eines Stellorganes 5 gesteuert wird. Ist der Brenner 2 ein Gasbrenner, dann ist das Stellorgan 5 eine motorgetriebene Klappe, deren Stellung den Gasstrom steuert. Ist der Brenner 2 ein Ölbrenner, dann ist das Stellorgan 5 ein motorgetriebener Öldruckregler. Ein von einem drehzahlsteuerbaren Motor 6 angetriebenes Gebläse 7 befördert Luft in die Brennkammer 4. Der Motor 6 ist beispielsweise ein Gleichstrommotor, dessen Drehzahl durch ein vom Steuer- und Regelgerät 1 abgegebenes pulsweitenmoduliertes Signal gesteuert wird. Als Motor 6 kann aber auch ein von einem Frequenzumrichter gesteuerter Wechselstrommotor eingesetzt sein. Ein Sensor 8 dient als Mittel zur Erfassung der Drehzahl des Gebläses 7. Der Sensor 8 ist beispielsweise ein aufder den Motor 6 mit dem Gebläse 7 verbindenden Welle angebrachter Tachogenerator. Als Sensor 8 kann auch ein Hallelement oder eine Lichtschranke dienen.Fig. 1 shows a control and regulating device 1 for a burner 2. The fuel is a Fuel line 3 fed to the combustion chamber 4, the amount of fuel from the control and Control device 1 is controlled by means of an actuator 5. If the burner 2 is a gas burner, then that is Actuator 5 is a motor-driven flap, the position of which controls the gas flow. The burner 2 is on Oil burner, then the actuator 5 is a motor-driven oil pressure regulator. One of a speed controllable Motor 6 driven fan 7 delivers air into the combustion chamber 4. The motor 6 is For example, a DC motor, the speed of which is controlled by a control device 1 emitted pulse width modulated signal is controlled. As a motor 6 can also be one of one Frequency converter controlled AC motor can be used. A sensor 8 serves as a means for Detection of the speed of the fan 7. The sensor 8 is, for example, one on the motor 6 with the Fan 7 connecting shaft attached tachometer generator. A Hall element can also be used as the sensor 8 or serve a light barrier.

Ein externer oder ein im Steuer- und Regelgerät 1 integrierter Heizkreisregler 9 teilt dem Steuer- und Regelgerät 1 die zur Deckung des Wärmebedarfs erforderliche Brennerleistung mit. In Abhängigkeit von diesem Wärmebedarfssignal steuert das Steuer- und Regelgerät 1 die stufenlos verstellbare Drehzahl des Gebläsemotors 6. Mittels des Sensors 8 erfasst das Steuer- und Regelgerät 1 laufend die momentane Drehzahl des Gebläses 7 und führt die Stellung des Stellorganes 5 derart der momentanen Drehzahl nach, dass die geförderte Brennstoffmenge und der geförderte Luftvolumenstrom ein für die Verbrennung optimales Brennstoff-Luft-Gemisch ergeben. Der Brenner 2 ist also luftgeführt.An external or a heating circuit controller 9 integrated in the control and regulating device 1 shares the control and Control unit 1 with the burner output required to cover the heat requirement. In dependence of this heat demand signal, the control and regulating device 1 controls the continuously variable speed of the Blower motor 6. By means of the sensor 8, the control and regulating device 1 continuously detects the current one Speed of the fan 7 and performs the position of the actuator 5 such the current speed after that the amount of fuel delivered and the air volume flow a for the Combustion optimal fuel-air mixture result. The burner 2 is therefore air-guided.

Die Fig. 2 zeigt ein Diagramm mit dem geförderten Luftvolumenstrom V und dem geförderten Brennstoff B in Funktion der Zeit t. Zur Zeit t1 erteilt das Steuer- und Regelgerät 1 aufgrund eines sprunghaft vergrösserten Wärmebedarfs dem Gebläsemotor 6 (Fig. 1) den Stellbefehl, die Drehzahl von einem Wert N1 von beispielsweise 1200 U/Min. auf einen Wert N2 von 1950 U/Min. zu erhöhen. Die dazu erforderliche Zeit τ beträgt typisch einige 100 Millisekunden bis einige Sekunden. In kurzen Zeitabständen, beispielsweise alle 20 Millisekunden, frägt das Steuer- und Regelgerät 1 den Sensor 8 ab und ermittelt aus dem Signal des Sensors 8 die momentane Drehzahl des Gebläses 7 und die der momentanen Drehzahl zugehörige Stellung des Stellorganes 5. Da sich die Drehzahl gegenüber der letzten Abfrage verändert hat, erteilt das Steuer- und Regelgerät 1 dem Stellorgan 5 den Stellbefehl, seine Stellung ebenfalls aufden neu ermittelten Wert zu ändern. Während der Luftvolumenstrom, wie im Diagramm ersichtlich ist, kontinuierlich ändert, wird die Brennstoffmenge in kleinen Schritten stufig nachgeführt.FIG. 2 shows a diagram with the conveyed air volume flow V and the conveyed fuel B as a function of time t. At time t 1 , the control and regulating device 1 gives the blower motor 6 (FIG. 1) the command to set the speed of rotation of a value N 1 of, for example, 1200 rpm due to an abruptly increased heat requirement. to a value N 2 of 1950 rpm. to increase. The time τ required for this is typically a few 100 milliseconds to a few seconds. At short intervals, for example every 20 milliseconds, the control and regulating device 1 interrogates the sensor 8 and determines the instantaneous speed of the blower 7 and the position of the actuator 5 associated with the instantaneous speed from the signal from the sensor 8 changed in the last query, the control and regulating device 1 issues the actuating element 5 with the actuating command to also change its position to the newly determined value. While the air volume flow changes continuously, as can be seen in the diagram, the amount of fuel is gradually adjusted in small steps.

Die gepunktete Linie 10 zeigt vergleichshalber den zeitlichen Verlauf der geförderten Brennstoffmenge, wenn der Befehl zur Änderung der Luftmenge und der Brennstoffmenge an den Gebläsemotor 6 bzw. das Stellorgan 5 gemäss dem Stand der Technik auf einmal erfolgt. Da das Stellorgan 5 seine neue Position viel schneller erreicht als das Gebläse 7 seine neue Drehzahl, wird für einige Zeit zuviel Brennstoff in die Brennkammer 4 gefördert.The dotted line 10 shows, for comparison, the time course of the amount of fuel delivered, when the command to change the air amount and the fuel amount to the blower motor 6 or the actuator 5 according to the prior art takes place at once. Since the actuator 5 its new Position reaches its new speed much faster than the blower 7 becomes too much fuel for some time promoted in the combustion chamber 4.

Die Nachführung des Stellorganes 5 gemäss der momentanen Drehzahl des Luftgebläses 7 bietet sicherheitstechnisch den Vorteil, dass bei einem Abfall der Drehzahl, z.B. weil bei einem dreiphasig angetriebenen Wechselstrommotor plötzlich eine Phase ausfallt, auch die geförderte Brennstoffmenge sofort reduziert wird.The tracking of the actuator 5 according to the current speed of the air blower 7 offers In terms of safety, the advantage that if the speed drops, e.g. because with a three-phase driven AC motor suddenly fails a phase, including the amount of fuel delivered is immediately reduced.

Claims (1)

Steuer- und Regelgerät (1) für einen Brenner (2), wobei die der Brennkammer (4) zugeführte Brennstoffmenge mittels eines motorgetriebenen Stellorganes (5) und der der Brennkammer (4) zugeführte Luftvolumenstrom mittels eines von einem drehzahlsteuerbaren Motor (6) angetriebenen Gebläses (7) gesteuert ist, dadurch gekennzeichnet, dass Mittel (8) zur Erfassung der momentanen Drehzahl des Gebläses (7) vorhanden sind und dass die Stellung des Stellorganes (5) aufgrund des von den Mitteln (8) gelieferten Signals nachgeführt ist.Control and regulating device (1) for a burner (2), the amount of fuel supplied to the combustion chamber (4) by means of a motor-driven actuator (5) and the air volume flow supplied to the combustion chamber (4) by means of a fan driven by a speed-controllable motor (6) (7) is controlled, characterized in that means (8) for detecting the instantaneous speed of the fan (7) are present and in that the position of the actuator (5) is tracked on the basis of the signal supplied by the means (8).
EP97112024A 1997-07-11 1997-07-11 Control device for a burner Withdrawn EP0890791A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97112024A EP0890791A1 (en) 1997-07-11 1997-07-11 Control device for a burner

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EP97112024A EP0890791A1 (en) 1997-07-11 1997-07-11 Control device for a burner

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182413A1 (en) * 2000-08-21 2002-02-27 Brückner Trockentechnik GmbH & Co. KG Apparatus and process for treatment of material webs
EP1331445A3 (en) * 2002-01-25 2004-06-16 Martin Gabriel Liquid fuel burner
WO2005035530A1 (en) 2003-10-16 2005-04-21 Symed Labs Limited A novel crystalline form of linezolid
EP1717514A1 (en) * 2005-04-29 2006-11-02 Alde International Systems AB Gas burner and methods for starting and operating the same
EP2105668A3 (en) * 2008-03-25 2017-09-20 Vaillant GmbH Method for operating a heating device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197966A (en) * 1986-04-23 1988-06-02 Rinnai Kk Burner control
JPH01252819A (en) * 1988-03-30 1989-10-09 Harman Co Ltd Combustion device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197966A (en) * 1986-04-23 1988-06-02 Rinnai Kk Burner control
JPH01252819A (en) * 1988-03-30 1989-10-09 Harman Co Ltd Combustion device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 003 (M - 915) 8 January 1990 (1990-01-08) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182413A1 (en) * 2000-08-21 2002-02-27 Brückner Trockentechnik GmbH & Co. KG Apparatus and process for treatment of material webs
EP1331445A3 (en) * 2002-01-25 2004-06-16 Martin Gabriel Liquid fuel burner
WO2005035530A1 (en) 2003-10-16 2005-04-21 Symed Labs Limited A novel crystalline form of linezolid
EP1717514A1 (en) * 2005-04-29 2006-11-02 Alde International Systems AB Gas burner and methods for starting and operating the same
EP2105668A3 (en) * 2008-03-25 2017-09-20 Vaillant GmbH Method for operating a heating device

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