EP0015480A2 - Device for the regulation of gas-firing mixtures - Google Patents

Device for the regulation of gas-firing mixtures Download PDF

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Publication number
EP0015480A2
EP0015480A2 EP80100938A EP80100938A EP0015480A2 EP 0015480 A2 EP0015480 A2 EP 0015480A2 EP 80100938 A EP80100938 A EP 80100938A EP 80100938 A EP80100938 A EP 80100938A EP 0015480 A2 EP0015480 A2 EP 0015480A2
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EP
European Patent Office
Prior art keywords
pressure
gas
line
combustion air
membrane
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Granted
Application number
EP80100938A
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German (de)
French (fr)
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EP0015480A3 (en
EP0015480B1 (en
Inventor
Gustav Ing.-grad. Niedergesäss
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EON Ruhrgas AG
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Ruhrgas AG
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    • 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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means

Definitions

  • the invention relates to a method for regulating the mixture of gas and combustion air for gas furnaces with preheating of the combustion air supplied to the burner by a blower, and a converter for pressure or differential pressure to a proportional pressure for carrying out the method.
  • Burners with the supply of combustion air from a separate air blower are mainly used for industrial furnaces. In most cases, all of the combustion air is forced into the burner in this way. For the economical use of fuel energy, it is necessary to keep the optimal mixture ratio of gas and combustion air as constant as possible over the entire load range of the burner. If the temperatures of gas and combustion air are constant, the mixture ratio gas / combustion air can be kept constant with known constant pressure control systems.
  • the exhaust gas heat is used in many gas furnaces or, in tunnel kilns, the storage heat of the fuel gas is also used to preheat the combustion air, e.g. B. with the help of recuperators.
  • recuperators e.g. B. in start-up or load change operations occur in the known direct Re due to different combustion air temperatures, deviations from the optimal gas / air ratio, which have an unfavorable effect on fuel consumption and furnace performance.
  • this could only be avoided with the help of complex ratio control systems with flow measurement of gas and combustion air and electrical, pneumatic or hydraulic auxiliary energy for controlling the gas / air ratio.
  • the gas supply can only be regulated depending on the air pressure with a simple constant pressure control system if the differential pressure of the air at a measuring throttle or the air pressure is increased accordingly in order to act as a control variable on the To be able to act gas pressure regulator.
  • the object of the invention is accordingly to provide a method and a device for carrying it out, by means of which the mixing ratio of gas and combustion air can be kept constant in a simple manner, regardless of fluctuating temperatures of the combustion air.
  • Another object of the invention is to provide a way of regulating the mixing ratio of gas and combustion air even in those furnaces in which the pressure of the combustion air is considerably lower than the gas pressure.
  • the device for performing these tasks should be inexpensive to manufacture and operate with small control deviations.
  • the transmission ratio should be changeable from inlet pressure to outlet pressure.
  • a measuring throttle 2 preferably in the form of a measuring orifice or nozzle, is installed in the combustion air line 8.
  • the differential pressure which arises at this measuring throttle is fed to the pressure transducer 1 via the lines 6 and 7.
  • the differential pressure is converted in the pressure converter 1 into a higher proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10.
  • the line 12 serves to supply the aid for the pressure transducer.
  • the line 13 is used to discharge the aid, for. B. when scaling down.
  • F i g. 2 shows an arrangement for carrying out the method according to claim 2.
  • a pressure measuring point 3 is installed in the combustion air line 8 in front of the recuperator 9.
  • the pressure of the combustion air supplied by the blower 4 to the burner 5 is supplied to the pressure converter 1 via the line 6.
  • the pressure is converted into an increased proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10.
  • the line 12 serves to supply the aid for the pressure transducer.
  • the line 13 serves to remove the aid.
  • F i g. 3 shows a longitudinal section through an exemplary embodiment of the pressure transducer for carrying out methods 1 and 2.
  • the membrane 16 is accommodated in the housing 15. If the flow-dependent differential pressure coming from the orifice plate 2 is to be converted into a proportional pressure as a control variable for the gas pressure regulator, the top of the membrane 16 is connected via the line 6 and the opening 21 with the plus pressure and the bottom of the membrane 16 via the line 7 and the opening 22 is acted upon by the minus pressure of the measuring orifice 2. If, instead of the differential pressure, the pressure in the combustion air line is used as a control variable, only the top of the membrane 16 is acted upon via line 6 and the opening 21 with this pressure. The opening 22 then serves as a breathing opening, ie. that is, the pressure of the outside air is present on the underside of the membrane.
  • Differential pressure or pressure are converted with the help of the membrane 16 into a force which causes a change in the position of the actuator 18 via the membrane plate 17.
  • the normal position of the actuator is by a known correction and compensation device, for. B. the compensation spring 19 shown in Figure 3, set.
  • the force transmitted from the actuator 18 'to the force switch 20 is converted into a proportional force there.
  • It is advantageous to use a pneumatic power switch since the auxiliary means of this power switch, gas or air, can be removed directly from the gas or air line, so no third-party equipment is required.
  • the main components of the pneumatic force switch known per se are a bellows 23 and an alternative control 24.
  • the auxiliary means is fed to the force switch 20 via the line 12. In the equilibrium state, only leakage quantities of the aid are required.
  • the transmission ratio of the inlet pressure to the pressure which acts on the gas pressure regulator as a control variable, can either be changed in a smaller range from approx. 1: 4 to 1: 7 by moving the adjusting slide 26 on the transmission lever 25 or by exchanging the force switch 20 for a force switch with an effective cross-section if a significant change in the gear ratio is necessary, e.g. B. 1:20.
  • the above-described possibilities for changing the gear ratio can vary this within wide limits. Since the mode of operation of the pressure transducer according to the invention is based on a force comparison, the control range is large and the control deviations are significantly smaller than if the function is carried out by a path comparison. In addition, the pressure transducer is inexpensive to manufacture.

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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

1. Apparatus for maintaining constant the mixing ratio of gas and combustion air which are fed through separate conduits to a blast burner having a pressure measuring point in one of the conduits, a membrane operated pressure transformer connected to the pressure measuring point which receives its working medium from one of the two conduits and produces a proportional pressure corresponding to the measured pressure and having a constant pressure controller controlled by the proportional pressure in the other conduit, characterised in that the membrane (16) of the pressure transformer (1) is held in its position of equilibrium by a valve controlled pilot (20) which receives the working medium and applies the proportional pressure to the constant pressure controller (11).

Description

Die Erfindung betrifft ein Verfahren zur Gemischregelung von Gas und Verbrennungsluft für Gasfeuerungen mit Vorwärmung der von einem Gebläse dem Brenner zugeführten Verbrennungsluft und einen Wandler für Druck oder Differenzdruck in einen proportionalen Druck zur Durchführung des Verfahrens.The invention relates to a method for regulating the mixture of gas and combustion air for gas furnaces with preheating of the combustion air supplied to the burner by a blower, and a converter for pressure or differential pressure to a proportional pressure for carrying out the method.

Brenner mit Zufuhr der Verbrennungsluft von einem separaten Luftgebläse werden vorwiegend für Industriefeuerungen eingesetzt. In den meisten Fällen wird die gesamte Verbrennungsluft dem Brenner auf diese Weise .zwangsweise zugeführt. Zur wirtschaftlichen Nutzung der Brennstoffenergie ist es notwendig, das optimale Mischungsverhältnis von Gas und Verbrennungsluft über den gesamten Lastbereich des Brenners möglichst konstant zu halten. Wenn die Temperaturen von Gas und Verbrennungsluft konstant sind, kann man mit bekannten Gleichdruckregelsystemen das Mischungsverhältnis Gas/ Verbrennungsluft konstant halten.Burners with the supply of combustion air from a separate air blower are mainly used for industrial furnaces. In most cases, all of the combustion air is forced into the burner in this way. For the economical use of fuel energy, it is necessary to keep the optimal mixture ratio of gas and combustion air as constant as possible over the entire load range of the burner. If the temperatures of gas and combustion air are constant, the mixture ratio gas / combustion air can be kept constant with known constant pressure control systems.

Um den Brennstoffverbrauch zu verringern, wird bei vielen Gasfeuerungen die Abgaswärme oder in Tunnelöfen auch die Speicherwärme des Brenngases zur Vorwärmung der Verbrennungsluft ausgenutzt, z. B. mit Hilfe von Rekuperatoren. Bei unterschiedlichem Wärmeangebot für die Rekuperatoren, z. B. bei Anfahr- oder Laständerungsvorgängen, treten bei den bekannten direkten Regelsystemen durch unterschiedliche Verbrennungslufttemperaturen entsprechende Abweichungen vom optimalen Gas/Luft-Verhältnis auf, die sich ungünstig auf Brennstoffverbrauch und Ofenleistung auswirken. Nur mit Hilfe aufwendiger Verhältnisregelsysteme mit Durchflußmessung von Gas und Verbrennungsluft und elektrischer, pneumatischer oder hydraulischer Hilfsenergie zur Regelung des Gas/Luft-Verhältnisses konnte das bisher vermieden werden. Wegen der hohen Kosten für derartige Regler verzichten viele Betreiber von Gasfeuerungen mit Luftvorwärmung auf eine so aufwendige Regelung und nehmen die entstehenden Nachteile und Energieverluste in Kauf. Bei Feuerungen, bei denen der Verbrennungsluftdruck erheblich geringer ist als der Gasdruck, ist eine Regelung der Gaszufuhr in Abhängigkeit vom Luftdruck mit einem einfachen Gleichdruckregelsystem nur möglich, wenn der Differenzdruck der Luft an einer Meßdrossel oder der Luftdruck entsprechend verstärkt wird, um als Steuergröße auf den Gasdruckregler wirken zu können.In order to reduce fuel consumption, the exhaust gas heat is used in many gas furnaces or, in tunnel kilns, the storage heat of the fuel gas is also used to preheat the combustion air, e.g. B. with the help of recuperators. With different heat supply for the recuperators, e.g. B. in start-up or load change operations occur in the known direct Re due to different combustion air temperatures, deviations from the optimal gas / air ratio, which have an unfavorable effect on fuel consumption and furnace performance. Until now, this could only be avoided with the help of complex ratio control systems with flow measurement of gas and combustion air and electrical, pneumatic or hydraulic auxiliary energy for controlling the gas / air ratio. Because of the high cost of such regulators, many operators of gas furnaces with air preheating do without such a complex control and accept the disadvantages and energy losses that arise. In furnaces in which the combustion air pressure is considerably lower than the gas pressure, the gas supply can only be regulated depending on the air pressure with a simple constant pressure control system if the differential pressure of the air at a measuring throttle or the air pressure is increased accordingly in order to act as a control variable on the To be able to act gas pressure regulator.

Aufgabe der Erfindung ist es demgemäß, ein Verfahren sowie eine Vorrichtung zu dessen Durchführung zu schaffen, mit deren Hilfe das Mischungsverhältnis von Gas und Verbrennungsluft, unabhängig von schwankenden Temperaturen der Verbrennungsluft, in einfacher Weise konstant gehalten werden kann. Eine weitere Aufgabe der Erfindung ist es, eine Möglichkeit zur Regelung des Mischungsverhältnisses von Gas und Verbrennungsluft auch bei solchen Feuerungen zu schaffen, bei denen der Druck der Verbrennungsluft erheblich niedriger ist als der Gasdruck. Die Vorrichtung zur Durchführung dieser Aufgaben soll kostengünstig herstellbar sein und mit geringen Regelabweichungen arbeiten. Außerdem soll das Übersetzungsverhältnis von Eingangsdruck zu Ausgangsdruck veränderbar sein.The object of the invention is accordingly to provide a method and a device for carrying it out, by means of which the mixing ratio of gas and combustion air can be kept constant in a simple manner, regardless of fluctuating temperatures of the combustion air. Another object of the invention is to provide a way of regulating the mixing ratio of gas and combustion air even in those furnaces in which the pressure of the combustion air is considerably lower than the gas pressure. The device for performing these tasks should be inexpensive to manufacture and operate with small control deviations. In addition, the transmission ratio should be changeable from inlet pressure to outlet pressure.

Diese Aufgaben werden durch die in den Ansprüchen 1 bis 4 angegebenen Maßnahmen bzw. Vorrichtungen gelöst.These tasks are solved by the measures or devices specified in claims 1 to 4.

Die erfindungsgemäßen Verfahren und der Druckwandler zur Durchführung der Verfahren werden nachstehend anhand der Figuren 1 bis 3 erläutert, die schematisch dargestellte Anordnungen zur Durchführung der Verfahren sowie eine beispielsweise Ausführungsform des Druckwandlers zeigen:

  • F i g. 1 zeigt eine Anordnung zur Durchführung des Verfahrens nach Anspruch 1.
The methods according to the invention and the pressure transducer for carrying out the methods are explained below with reference to FIGS. 1 to 3, which show schematically illustrated arrangements for carrying out the methods and an example embodiment of the pressure transducer:
  • F i g. 1 shows an arrangement for carrying out the method according to claim 1.

Die vom Gebläse 4 durch die Leitung 8 dem Brenner 5 zugeführte Verbrennungsluft wird im Rekuperator 9 erwärmt. Vor dieser Erwärmungsstelle 9 ist eine Meßdrossel 2, vorzugsweise in Form einer Meßblende oder -düse, in der Verbrennungsluftleitung 8 eingebaut.The combustion air supplied to the burner 5 by the fan 4 through the line 8 is heated in the recuperator 9. In front of this heating point 9, a measuring throttle 2, preferably in the form of a measuring orifice or nozzle, is installed in the combustion air line 8.

Der an dieser Meßdrossel entstehende Differenzdruck wird über die Leitungen 6 und 7 dem Druckwandler 1 zugeführt. Der Differenzdruck wird im Druckwandler 1 in einen höheren Proporticnaldruck umgewandelt, der über die Leitung 14 als Steuergröße auf den in der Gasleitung 10 angeordneten Gasdruckregler 11 einwirkt. Die Leitung 12 dient zur Zufuhr des Hilfsmittels für den Druckwandler. Die Leitung 13 dient zum Abführen des Hilfsmittels, z. B. beim Herunterregeln.The differential pressure which arises at this measuring throttle is fed to the pressure transducer 1 via the lines 6 and 7. The differential pressure is converted in the pressure converter 1 into a higher proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10. The line 12 serves to supply the aid for the pressure transducer. The line 13 is used to discharge the aid, for. B. when scaling down.

F i g. 2 zeigt eine Anordnung zur Durchführung des Verfahrens nach Anspruch 2. Statt einer Meßdrossel ist eine Druckmeßstelle 3 in der Verbrennungsluftleitung 8 vor dem Rekuperator 9 eingebaut. Der Druck der vom Gebläse 4 gelieferten dem Brenner 5 zugeführten Verbrennungsluft wird über die Leitung 6 dem Druckwandler 1 zugeführt. In diesem wird der Druck in einen verstärkten Proportionaldruck umgewandelt, der über die Leitung 14 als Steuergröße auf den in der Gasleitung 10 angeordneten Gasdruckregler 11 einwirkt. Die Leitung 12 dient zur Zufuhr des Hilfsmittels für den Druckwandler. Die Leitung 13 dient zur Abfuhr des Hilfsmittels.F i g. 2 shows an arrangement for carrying out the method according to claim 2. Instead of a measuring throttle, a pressure measuring point 3 is installed in the combustion air line 8 in front of the recuperator 9. The pressure of the combustion air supplied by the blower 4 to the burner 5 is supplied to the pressure converter 1 via the line 6. In this, the pressure is converted into an increased proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10. The line 12 serves to supply the aid for the pressure transducer. The line 13 serves to remove the aid.

F i g. 3 zeigt einen Längsschnitt durch eine bespielsweise Ausführungsform des Druckwandlers zur Durchführung der Verfahren 1 und 2.F i g. 3 shows a longitudinal section through an exemplary embodiment of the pressure transducer for carrying out methods 1 and 2.

Im Gehäuse 15 ist die Membran 16 untergebracht. Soll der von der Meßblende 2 kommende durchflußabhängige Differenzdruck in einen Proportionaldruck als Steuergröße für den Gasdruckregler umgewandelt werden, so wird die Oberseite der Membran 16 über die Leitung 6 und die öffnung 21 mit dem Plus-Druck und die Unterseite der Membran 16 über die Leitung 7 und die öffnung 22 mit dem Minus-Druck der Meßblende 2 beaufschlagt. Wird anstatt des Differenzdruckes der Druck in der Verbrennungsluftleitung als Steuergröße verwendet, so wird nur die Oberseite der Membran 16 über die Leitung 6 und die öffnung 21 mit diesem Druck beaufschlagt. Die öffnung 22 dient dann als Atmungs- öffnung, d. h., an der Unterseite der Membran steht der Druck der Außenluft an.The membrane 16 is accommodated in the housing 15. If the flow-dependent differential pressure coming from the orifice plate 2 is to be converted into a proportional pressure as a control variable for the gas pressure regulator, the top of the membrane 16 is connected via the line 6 and the opening 21 with the plus pressure and the bottom of the membrane 16 via the line 7 and the opening 22 is acted upon by the minus pressure of the measuring orifice 2. If, instead of the differential pressure, the pressure in the combustion air line is used as a control variable, only the top of the membrane 16 is acted upon via line 6 and the opening 21 with this pressure. The opening 22 then serves as a breathing opening, ie. that is, the pressure of the outside air is present on the underside of the membrane.

Differenzdruck oder Druck werden mit Hilfe der Membran 16 in eine Kraft umgewandelt, welche über den Membranteller 17 eine Veränderung der Stellung des Stellgliedes 18 bewirkt. Die Normalstellung des Stellgliedes wird durch eine an sich bekannte Korrektur- und Ausgleichsvorrichtung, z. B. die in Figur 3 dargestellte Ausgleichsfeder 19, eingestellt. Die vom Stellglied 18'auf den Kraftschalter 20 übertragene Kraft wird in diesem in eine proportionale Kraft umgewandelt. Es ist vorteilhaft, einen pneumatischen Kraftschalter zu verwenden, da das Hilfsmittel dieses Kraftschalters,Gas oder Luft, direkt aus der Gas- oder Luftleitung entnommen werden kann, also kein fremdes Arbeitsmittel benötigt wird. Die Hauptbauteile des an sich bekannten pneumatischen Kraftschalters sind ein Faltenbalg 23 und eine Alternativsteuerung 24. Das Hilfsmittel wird dem Kraftschalter 20 über die Leitung 12 zugeführt. Im Gleichgewichtszustand werden nur Leckmengen des Hilfsmittels benötigt. Während des Regelvorganges - je nach dem, ob mehr oder weniger Gas am Brenner benötigt wird - wird das Arbeitsmittel entweder gespeichert, oder über die Leitung 13 abgeführt. Das Übersetzungsverhältnis des Eingangsdruckes zum Druck, der auf den Gasdruckregler als Steuergröße einwirkt, kann entweder in kleinerem Bereich ca. von 1 : 4 bis 1 : 7 durch Verschieben des Verstellschiebers 26 auf dem übersetzungshebel 25 geändert werden oder durch Austausch des Kraftschalters 20 gegen einen Kraftschalter mit entsprechendem wirksamen Querschnitt, wenn eine beträchtliche Veränderung des Übersetzungsverhältnisses notwendig ist, z. B. auf 1 : 20.Differential pressure or pressure are converted with the help of the membrane 16 into a force which causes a change in the position of the actuator 18 via the membrane plate 17. The normal position of the actuator is by a known correction and compensation device, for. B. the compensation spring 19 shown in Figure 3, set. The force transmitted from the actuator 18 'to the force switch 20 is converted into a proportional force there. It is advantageous to use a pneumatic power switch, since the auxiliary means of this power switch, gas or air, can be removed directly from the gas or air line, so no third-party equipment is required. The main components of the pneumatic force switch known per se are a bellows 23 and an alternative control 24. The auxiliary means is fed to the force switch 20 via the line 12. In the equilibrium state, only leakage quantities of the aid are required. During the control process - depending on whether more or less gas is required on the burner - the working fluid is either stored or via the line 13 discharged. The transmission ratio of the inlet pressure to the pressure, which acts on the gas pressure regulator as a control variable, can either be changed in a smaller range from approx. 1: 4 to 1: 7 by moving the adjusting slide 26 on the transmission lever 25 or by exchanging the force switch 20 for a force switch with an effective cross-section if a significant change in the gear ratio is necessary, e.g. B. 1:20.

Durch die vorstehend beschriebenen Möglichkeiten zur Änderung des Übersetzungsverhältnisses kann dieses in weiten Grenzen variiert werden. Da die Funktionsweise des erfindungsgemäßen Druckwandlers auf einem Kraftvergleich beruht, ist der Regelbereich groß und die Regelabweichungen sind wesentlich geringer, als wenn die Funktion durch einen Wegvergleich erfolgt. Außerdem ist der Druckwandler kostengünstig herstellbar.The above-described possibilities for changing the gear ratio can vary this within wide limits. Since the mode of operation of the pressure transducer according to the invention is based on a force comparison, the control range is large and the control deviations are significantly smaller than if the function is carried out by a path comparison. In addition, the pressure transducer is inexpensive to manufacture.

Claims (4)

1. Verfahren zur Gemischregelung von Gas und Verbrennungsluft für Gasfeuerungen mit Vorwärmung der von einem Gebläse dem Brenner zugeführten Verbrennungs- luft
dadurch gekennzeichnet,
daß in der Verbrennungsluftleitung (8) vor der Lufterwärmungseinrichtung (9) eine Drosselstelle (2), vorzugsweise eine Meßblende oder -düse, angeordnet ist, deren Differenzdruck über Leitungen (6 und 7) auf einen membrangesteuerten Druckwandler (1) übertragen und in diesem in einen höheren Proportionaldruck umgewandelt wird, und daß dieser Proportionaldruck über die Leitung (14) auf einen in der Gasleitung (10) angeordneten Druckregler (11) als Steuergröße einwirkt.1. Method for regulating the mixture of gas and combustion air for gas firing systems with preheating of the combustion air supplied to the burner by a fan
characterized,
that a throttle point (2), preferably a measuring orifice, is arranged in the combustion air line (8) upstream of the air heating device (9), the differential pressure of which is transmitted via lines (6 and 7) to a diaphragm-controlled pressure transducer (1) and in it a higher proportional pressure is converted, and that this proportional pressure acts via the line (14) on a pressure regulator (11) arranged in the gas line (10) as a control variable. 2. Verfahren zur Gemischregelung von Gas und Verbrennungsluft für Gasfeuerungen mit Vorwärmung der von einem Gebläse dem Brenner zugeführten Verbrennungsluft
dadurch gekennzeichnet,
daß in der Verbrennungsluftleitung (8) vor der Luft-erwärmungseinrichtung (9) eine Druckentnahmestelle (3) angeordnet ist, deren Druck über eine Leitung (6) auf einen membrangesteuerten Druckwandler (1) übertragen und in diesem in einen höheren Proportionaldruck umgewandelt wird, und daß dieser Proportionaldruck über eine Leitung (14) auf einen in der Gas- , leitung (10) angeordneten Druckregler (11) als Steuergröße einwirkt.2. Method for regulating the mixture of gas and combustion air for gas firing systems with preheating of the combustion air supplied to the burner by a fan
characterized,
that in the combustion air line (8) in front of the air heating device (9) a pressure tapping point (3) is arranged, the pressure of which is transferred via a line (6) to a diaphragm-controlled pressure transducer (1) and converted into a higher proportional pressure therein, and that this proportional pressure acts via a line (14) on a pressure regulator (11) arranged in the gas line (10) as a control variable. 3. Wandler für Druck oder Differenzdruck in einen proportionalen Druck zur Durchführung des Verfahrens nach Anspruch 1 oder 2
gekennzeichnet durch
eine in einem Gehäuse (15) angeordnete Membran (16), deren Membranteller (17) mit einem Stellglied (18) verbunden ist, dessen Normalstellung durch eine Korrektur- bzw. Ausgleichsvorrichtung (19), vorzugsweise eine regulierbare Feder, eingestellt wird und einen Kraftschalter (20) mit Faltenbalg (23) und Alternativsteuerung (24), auf den das Stellglied ( 18 ) einwirkt,
eine Öffnung (21) im Membrangehäuse (15), durch die der Raum oberhalb der Membran (16) mit einer Drosselstelle (2) oder mit der Druckentnahmestelle (3) in der Verbrennungsluftleitung (8) verbunden wird,
eine öffnung (22) im Membrangehäuse (15), durch die der Raum unterhalb der Membran (16) mit einer Drosselstelle (2) in der Verbrennungsluftleitung (8) oder mit der Außenluft verbunden wird, Zu- und Abführleitungen (12, 13) für das Hilfsmittel des Kraftschalters(20) sowie eine Verbindungsleitung (14) zur Übertragung des Proportionaldruckes auf den Gasdruckregler (11).3. Converter for pressure or differential pressure to a proportional pressure to carry out the process according to claim 1 or 2
marked by
a membrane (16) arranged in a housing (15), the membrane plate (17) of which is connected to an actuator (18), the normal position of which is adjusted by a correction or compensation device (19), preferably an adjustable spring, and a force switch (20) with bellows (23) and alternative control (24), on which the actuator (18) acts,
an opening (21) in the M embrangehäuse (15) through which the space above the diaphragm (16) is connected to a throttle point (2) or with the pressure tapping point (3) in the combustion air line (8),
an opening (22) in the membrane housing (15) through which the space below the membrane (16) is connected to a throttle point (2) in the combustion air line (8) or to the outside air, supply and discharge lines (12, 13) for the aid of the power switch (20) and a connecting line (14) for transferring the proportional pressure to the gas pressure regulator (11). 4. Wandler für Druck oder Differenzdruck in einen proportionalen Druck nach Anspruch 3
dadurch gekennzeichnet,
daß zwischen Stellglied (18) und Kraftschalter (20) ein Übersetzungshebel (25) mit Verstellschieber (26) zur Änderung des übersetzungsverhältnisses angeordnet ist.4. converter for pressure or differential pressure into a proportional pressure according to claim 3
characterized,
that between the actuator (18) and force switch (20) a translation lever (25) with adjusting slide (26) is arranged to change the gear ratio.
EP19800100938 1979-03-02 1980-02-26 Device for the regulation of gas-firing mixtures Expired EP0015480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792908197 DE2908197C2 (en) 1979-03-02 1979-03-02 Device for keeping the mixing ratio of gas and combustion air constant in forced draft burners
DE2908197 1979-03-02

Publications (3)

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EP0015480A2 true EP0015480A2 (en) 1980-09-17
EP0015480A3 EP0015480A3 (en) 1981-01-07
EP0015480B1 EP0015480B1 (en) 1984-06-20

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EP19800100938 Expired EP0015480B1 (en) 1979-03-02 1980-02-26 Device for the regulation of gas-firing mixtures

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EP (1) EP0015480B1 (en)
DE (1) DE2908197C2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165347A (en) * 1984-10-04 1986-04-09 British Gas Corp Burner air/gas ratio control
GB2185810A (en) * 1986-01-28 1987-07-29 Landis & Gyr Ag Methods of and apparatus for regulating the amounts of gas and air for gas blower burners
DE3818363A1 (en) * 1987-10-19 1989-04-27 Landis & Gyr Ag Method and apparatus for gas-air quantity control for gas blowpipes
EP0390964A2 (en) * 1989-04-07 1990-10-10 Honeywell B.V. Control device for gas burners
EP0589404A1 (en) * 1992-09-21 1994-03-30 G. Kromschröder Aktiengesellschaft Method and device for controlling a gas stream
CN109442405A (en) * 2018-12-26 2019-03-08 广州威茨热能技术有限公司 A kind of air-fuel ratio mixer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3009591A1 (en) * 1980-03-13 1981-09-17 G. Kromschröder AG, 4500 Osnabrück Gas burner air-fuel ratio control equipment - is for flue gas preheated air and has flow metering orifice in cold air branch to own recuperator and blast gate
DE3545264A1 (en) * 1985-12-20 1987-06-25 Ruhrgas Ag Device for regulating the mixture of gas and combustion air for gas-fired installations

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB443259A (en) * 1934-11-22 1936-02-25 James Keith Apparatus for effecting the proportional delivery of combustible and combustion-supporting media to furnaces and the like
AT196999B (en) * 1954-05-26 1958-04-10 Askania Werke Ag Device for automatically maintaining constant the ratio of two flowing media, in particular gas-warm air mixture regulator
DE1751350A1 (en) * 1967-05-15 1971-12-30 Tokyo Gas Co Ltd Air-gas flow proportional regulator
DE2412720A1 (en) * 1974-03-16 1975-09-25 Gerlach Werke Gmbh DEVICE FOR ADJUSTING AND AUTOMATICALLY REGULATING THE MIXING RATIO OF A GAS-AIR MIXTURE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2834242A1 (en) * 1978-08-04 1980-02-14 Kromschroeder Ag G Blower type burner automatic regulator - controls gas and air supply to ensure optimum mixture composition over working range by air pressure sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB443259A (en) * 1934-11-22 1936-02-25 James Keith Apparatus for effecting the proportional delivery of combustible and combustion-supporting media to furnaces and the like
AT196999B (en) * 1954-05-26 1958-04-10 Askania Werke Ag Device for automatically maintaining constant the ratio of two flowing media, in particular gas-warm air mixture regulator
DE1751350A1 (en) * 1967-05-15 1971-12-30 Tokyo Gas Co Ltd Air-gas flow proportional regulator
DE2412720A1 (en) * 1974-03-16 1975-09-25 Gerlach Werke Gmbh DEVICE FOR ADJUSTING AND AUTOMATICALLY REGULATING THE MIXING RATIO OF A GAS-AIR MIXTURE

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165347A (en) * 1984-10-04 1986-04-09 British Gas Corp Burner air/gas ratio control
GB2185810A (en) * 1986-01-28 1987-07-29 Landis & Gyr Ag Methods of and apparatus for regulating the amounts of gas and air for gas blower burners
GB2185810B (en) * 1986-01-28 1989-11-01 Landis & Gyr Ag Methods of and apparatus for regulating the amounts of gas and air for gas blower burners
DE3818363A1 (en) * 1987-10-19 1989-04-27 Landis & Gyr Ag Method and apparatus for gas-air quantity control for gas blowpipes
EP0390964A2 (en) * 1989-04-07 1990-10-10 Honeywell B.V. Control device for gas burners
EP0390964A3 (en) * 1989-04-07 1990-12-27 Honeywell Bv Control device for gas burners
EP0589404A1 (en) * 1992-09-21 1994-03-30 G. Kromschröder Aktiengesellschaft Method and device for controlling a gas stream
CN109442405A (en) * 2018-12-26 2019-03-08 广州威茨热能技术有限公司 A kind of air-fuel ratio mixer
CN109442405B (en) * 2018-12-26 2023-12-05 广州威茨热能技术有限公司 Air-fuel ratio example mixer

Also Published As

Publication number Publication date
DE2908197C2 (en) 1985-08-22
EP0015480A3 (en) 1981-01-07
DE2908197A1 (en) 1980-09-04
EP0015480B1 (en) 1984-06-20

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