EP1083387A2 - Method for operating a gas burner with a modulated controlled burner load - Google Patents

Method for operating a gas burner with a modulated controlled burner load Download PDF

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Publication number
EP1083387A2
EP1083387A2 EP00117040A EP00117040A EP1083387A2 EP 1083387 A2 EP1083387 A2 EP 1083387A2 EP 00117040 A EP00117040 A EP 00117040A EP 00117040 A EP00117040 A EP 00117040A EP 1083387 A2 EP1083387 A2 EP 1083387A2
Authority
EP
European Patent Office
Prior art keywords
combustion air
flow
gas
burner
determined
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Withdrawn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
EP00117040A
Other languages
German (de)
French (fr)
Other versions
EP1083387A3 (en
Inventor
Kersten Wehmeier
Markus Rotert
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1083387A2 publication Critical patent/EP1083387A2/en
Publication of EP1083387A3 publication Critical patent/EP1083387A3/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/13—Measuring temperature outdoor temperature
    • 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 is based on a method for operating a gas burner according to the preamble of the main claim.
  • the known method of this type is the pressure drop measured by the flow resistance in the combustion air duct, from this to the volume of the combustion air flow closed and accordingly on the gas actuator or the gas supply acted.
  • Changes in pressure and changes in volume flow in one quadratic relationship and stand for a desired Modulation range of the burner output of 10: 1 on Differential pressure range of 100: 1 would have to be detected.
  • this is especially true for devices with one mechanical linkage of air and fuel control today only up to a modulation range of approximately 4: 1 controlled.
  • the measures and means envisaged can be both downstream of the Blower and upstream of the blower are provided.
  • An embodiment of the invention is in the drawing based on a supply and control device for one Premix burner shown.
  • the device shown has a blower 10, the Speed is controlled depending on the heat demand.
  • the blower 10 conveys into a combustion air duct 12, in which a Aperture 14 is installed as a flow resistance, the effective cross section as described below is adjustable. Downstream of the aperture 14 opens a gas line 16 into the combustion air duct 12, the is controlled by an electric gas control valve 18. Upstream of the aperture 14 is a device 20 for detection the temperature of the combustion air flow provided that for devices with lambda control for converting the Volume flow to mass flow can serve.
  • the controller 32 controls Control component 36 on the gas control valve 18, which the Gas supply in accordance with the control signal y or respectively set size of the effective glare cross section in the sense an optimal fuel-air ratio in a wide range Modulation range of the gas burner affected.

Abstract

The method involves modulating the burner function. A temperature-controlled fan (10) supplies combustion air. An aperture (14) forms a flow resistance in an air channel (12). A gas line opens into the air channel behind the aperture. A unit measures the air flow and controls the gas supply. The pressure drop across the aperture is determined to adjust its effective cross-section, to keep the pressure drop at a constant desired value (W). The gas supply is controlled according to the cross-section or the adjustment movement.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zum Betreiben eines Gasbrenners nach der Gattung des Hauptanspruchs. Bei den bekannten Verfahren dieser Gattung wird der Druckabfall am Strömungswiderstand im Verbrennungsluftkanal gemessen, daraus auf das Volumen des Verbrennungsluftstromes geschlossen und dementsprechend auf das Gasstellglied bzw. die Gaszufuhr eingewirkt. Dabei ist jedoch zu beachten, daß Druckänderungen und Volumenstromänderungen in einem quadratischen Verhältnis stehen und für einen angestrebten Modulationsbereich der Brennerleistung von 10 : 1 ein Differenzdruckbereich von 100 : 1 detektiert werden müßte. Das wird jedoch insbesondere bei Geräten mit einem mechanischen Verbund der Luft- und Brennstoffsteuerung heute nur bis zu einem Modulationsbereich von etwa 4 : 1 beherrscht.The invention is based on a method for operating a gas burner according to the preamble of the main claim. At The known method of this type is the pressure drop measured by the flow resistance in the combustion air duct, from this to the volume of the combustion air flow closed and accordingly on the gas actuator or the gas supply acted. However, it should be noted that Changes in pressure and changes in volume flow in one quadratic relationship and stand for a desired Modulation range of the burner output of 10: 1 on Differential pressure range of 100: 1 would have to be detected. However, this is especially true for devices with one mechanical linkage of air and fuel control today only up to a modulation range of approximately 4: 1 controlled.

Vorteile der ErfindungAdvantages of the invention

Durch das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs kann der Modulationsbereich der Brennerleistung gegenüber den heute realisierbaren Werten wesentlich erweitert und dadurch der Wirkungsgrad des Brenners erhöht werden. Da hierbei nur eine gute Auflösung für den Sollwert gefordert ist, sind auch die an die Sensoren gestellten Anforderungen gut beherrschbar.By the inventive method with the characteristic Features of the main claim can be the modulation range Burner output compared to the values that can be achieved today significantly expanded and thereby the efficiency of the Brenners can be increased. Because this is only a good resolution is required for the setpoint Requirements placed on sensors are well manageable.

Wenn auch die Temperatur des Verbrennungsluftstroms ermittelt wird, kann über diese Information aus dem Volumenstrom der Massenstrom bestimmt werden. Da die Gastemperatur weniger schwankt und als konstant angesetzt wird, kann somit über einen Massenstromzusammenhang eine noch bessere Lambda-Steuerung erfolgen als über die Volumenströme.If the temperature of the combustion air flow can be determined using this information from the Volume flow of mass flow can be determined. Since the Gas temperature fluctuates less and is assumed to be constant a mass flow connection can be used Lambda control is even better than that Volume flows.

Die zur Durchführung des erfindungsgemäßen Verfahrens vorgesehenen Maßnahmen und Mittel können sowohl stromab des Gebläses als auch stromauf des Gebläses vorgesehen werden.To carry out the method according to the invention The measures and means envisaged can be both downstream of the Blower and upstream of the blower are provided.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung anhand einer Versorgungs- und Regeleinrichtung für einen Vormischbrenner dargestellt.An embodiment of the invention is in the drawing based on a supply and control device for one Premix burner shown.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die dargestellte Einrichtung hat ein Gebläse 10, dessen Drehzahl wärmebedarfsabhängig gesteuert ist. Das Gebläse 10 fördert in einen Verbrennungsluftkanal 12, in welchem eine Blende 14 als Strömungswiderstand eingebaut ist, deren wirksamer Querschnitt, wie nachstehend beschrieben, verstellbar ausgeführt ist. Stromab der Blende 14 mündet eine Gasleitung 16 in den Verbrennungsluftkanal 12 ein, die von einem elektrischen Gasregelventil 18 gesteuert ist. Stromauf der Blende 14 ist eine Einrichtung 20 zum Erfassen der Temperatur des Verbrennungsluftstroms vorgesehen, die bei Geräten mit Lambda-Regelung für die Umrechnung des Volumenstroms auf Massenstrom dienen kann.The device shown has a blower 10, the Speed is controlled depending on the heat demand. The blower 10 conveys into a combustion air duct 12, in which a Aperture 14 is installed as a flow resistance, the effective cross section as described below is adjustable. Downstream of the aperture 14 opens a gas line 16 into the combustion air duct 12, the is controlled by an electric gas control valve 18. Upstream of the aperture 14 is a device 20 for detection the temperature of the combustion air flow provided that for devices with lambda control for converting the Volume flow to mass flow can serve.

Zum Erfassen des Verbrennungsluftstroms und Steuern bzw. Regeln der Gaszufuhr ist eine insgesamt mit der Bezugszahl 22 bezeichnete Regeleinrichtung vorgesehen, deren Regelgröße x der über Sensoren 24 und 26 vor und hinter der Blende 14 und einem Differenzdruckbildner 28 ermittelte Druckabfall an der Blende 14 ist. Dieser Druckabfall wird erfindungsgemäß auf einem konstanten Sollwert w mit Hilfe eines Reglers 32 gehalten, der aus der an einem Vergleicher 30 ermittelten Regelabweichung ein Stellsignal y für ein Stellglied 34 bildet. Dieses greift beispielsweise auf mechanischem Weg auf ein verstellbares Blendenteil ein, dessen Stellung die Größe des wirksamen Blendenquerschnitts bestimmt. Bei einer Änderung des Verbrennungsluft-Volumenstroms dauert ein Eingriff des Stellgliedes 34 auf die Blende 14 so lange an, bis der Druckabfall über der Blende 14 den vorgeschriebenen Sollwert w wieder erreicht hat.For recording the combustion air flow and controlling or Regulating the gas supply is one with the reference number 22 designated control device provided, the controlled variable x of the sensors 24 and 26 in front of and behind the diaphragm 14 and a differential pressure generator 28 determined pressure drop the aperture 14 is. This pressure drop is according to the invention to a constant setpoint w with the help of a controller 32 held that from the determined on a comparator 30 Control deviation an actuating signal y for an actuator 34 forms. This works mechanically, for example on an adjustable panel part, the position of which Size of the effective aperture cross section determined. At a The combustion air volume flow continues to change Engagement of the actuator 34 on the diaphragm 14 until until the pressure drop across the orifice 14 to the prescribed Has reached setpoint w again.

Parallel zum Stellglied 34 steuert der Regler 32 ein Regelbauteil 36 am Gasregelventil 18 an, welches die Gaszufuhr nach Maßgabe des Stellsignals y bzw. der jeweils eingestellten Größe des wirksamen Blendquerschnitts im Sinne eines optimalen Brennstoff-Luftverhältnisses in einem weiten Modulationsbereich des Gasbrenners beeinflußt.In parallel to the actuator 34, the controller 32 controls Control component 36 on the gas control valve 18, which the Gas supply in accordance with the control signal y or respectively set size of the effective glare cross section in the sense an optimal fuel-air ratio in a wide range Modulation range of the gas burner affected.

Claims (2)

Verfahren zum Betreiben eines Gasbrenners mit modulierend geregelter Brennerleistung, mit einem wärmebedarfsabhängig gesteuerten Gebläse für die Zuführung der Verbrennungsluft, einem Strömungswiderstand im Verbrennungsluftkanal, einer dahinter in den Verbrennungsluftkanal einmündenden Gasleitung und mit einer Einrichtung, durch welche der jeweilige Verbrennungsluftstrom ermittelt und dementsprechend die Gaszufuhr über ein Gasstellglied gesteuert wird, dadurch gekennzeichnet, daß zur Ermittlung des Verbrennungsluftstroms der Druckabfall über dem Strömungswiderstand (14) durch Verstellen dessen wirksamen Querschnitts konstant auf einem Sollwert gehalten wird und die Gaszufuhr nach Maßgabe des jeweiligen Querschnitts bzw. der Stellbewegung gesteuert bzw. geregelt wird.Method of operating a gas burner with modulating regulated burner output, with a heat demand controlled blower for supplying the combustion air, a flow resistance in the combustion air duct, one behind it opening into the combustion air duct Gas pipe and with a device through which the respective combustion air flow determined and accordingly the gas supply via a gas actuator is controlled, characterized in that for determination of the combustion air flow the pressure drop over the Flow resistance (14) by adjusting its effective Cross-section is kept constant at a setpoint and the gas supply according to the respective cross-section or the actuating movement is controlled or regulated. Verfahren nach Anspruch 1, dadurch gekennzeichnet, das die Temperatur des Verbrennungsluftstroms ermittelt und über diese Information aus dem Volumenstrom der Massenstrom bestimmt wird.A method according to claim 1, characterized in that the Temperature of the combustion air flow is determined and above this information from the volume flow the mass flow is determined.
EP00117040A 1999-09-11 2000-08-09 Method for operating a gas burner with a modulated controlled burner load Withdrawn EP1083387A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19943612 1999-09-11
DE19943612A DE19943612B4 (en) 1999-09-11 1999-09-11 Method for operating a gas burner with modulating burner output

Publications (2)

Publication Number Publication Date
EP1083387A2 true EP1083387A2 (en) 2001-03-14
EP1083387A3 EP1083387A3 (en) 2003-08-06

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EP00117040A Withdrawn EP1083387A3 (en) 1999-09-11 2000-08-09 Method for operating a gas burner with a modulated controlled burner load

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DE (1) DE19943612B4 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109974059A (en) * 2019-04-29 2019-07-05 广东万和热能科技有限公司 Range hood wind pressure detects control method, device, equipment and storage medium
EP4004441A4 (en) * 2019-07-23 2023-12-13 Astec, Inc. Modular fuel burner assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626219A (en) * 1992-07-06 1994-02-01 Yamaha Motor Co Ltd Segment of simplified floor type builtup pool
JPH0691132A (en) * 1992-09-17 1994-04-05 Chiyoda Corp Exhaust gas treatment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109841C2 (en) * 1991-03-26 1994-06-09 Bosch Gmbh Robert Control device for gas burners with a fan for supplying combustion air
NL1009879C1 (en) * 1997-08-25 1999-02-26 Vaillant Bv Heating installation.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626219A (en) * 1992-07-06 1994-02-01 Yamaha Motor Co Ltd Segment of simplified floor type builtup pool
JPH0691132A (en) * 1992-09-17 1994-04-05 Chiyoda Corp Exhaust gas treatment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 237 (M-1600), 6. Mai 1994 (1994-05-06) & JP 06 026219 A (YAMAHA MOTOR CO LTD), 1. Februar 1994 (1994-02-01) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 357 (C-1221), 6. Juli 1994 (1994-07-06) & JP 06 091132 A (CHIYODA CORP), 5. April 1994 (1994-04-05) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109974059A (en) * 2019-04-29 2019-07-05 广东万和热能科技有限公司 Range hood wind pressure detects control method, device, equipment and storage medium
EP4004441A4 (en) * 2019-07-23 2023-12-13 Astec, Inc. Modular fuel burner assembly

Also Published As

Publication number Publication date
DE19943612A1 (en) 2001-03-29
DE19943612B4 (en) 2004-07-15
EP1083387A3 (en) 2003-08-06

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