EP0450173A1 - Mixture control device for a pre-mixed gas burner - Google Patents

Mixture control device for a pre-mixed gas burner Download PDF

Info

Publication number
EP0450173A1
EP0450173A1 EP90124419A EP90124419A EP0450173A1 EP 0450173 A1 EP0450173 A1 EP 0450173A1 EP 90124419 A EP90124419 A EP 90124419A EP 90124419 A EP90124419 A EP 90124419A EP 0450173 A1 EP0450173 A1 EP 0450173A1
Authority
EP
European Patent Office
Prior art keywords
gas
pressure
throttle
air
pressure regulator
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Withdrawn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
EP90124419A
Other languages
German (de)
French (fr)
Inventor
Jürgen Dr. Rolker
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
Landis and Gyr Betriebs 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 Landis and Gyr Betriebs AG filed Critical Landis and Gyr Betriebs AG
Publication of EP0450173A1 publication Critical patent/EP0450173A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical 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
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • 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
    • F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • 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
    • 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
    • F23N2235/18—Groups of two or more valves
    • 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
    • F23N2235/20—Membrane valves

Definitions

  • the invention relates to a device for mixture control of the type mentioned in the preamble of claim 1.
  • Such devices are advantageously used in gas burners in which a pressure difference between the combustion chamber and the atmosphere is generated by means of a fan.
  • the blower can be arranged in the supply air or exhaust air line or directly in front of the burner.
  • a device of the type mentioned in the preamble of claim 1 is known from EP-OS 0 275 568.
  • a gas pressure regulator is used for the mixture control, which is controlled by a differential pressure signal, which is taken from a panel in the combustion air line.
  • the measuring element in the air line generates additional pressure loss, which is why a correspondingly stronger fan must be used.
  • Two control lines are also required to transmit the differential pressure signal to the gas pressure regulator.
  • either the diameter of the throttle in the gas output or in the air line must be adjusted or the area ratio of the membranes loaded with gas and air must be changed.
  • the invention has for its object to provide a device in which instead of two control lines between the air supply line and pressure regulator only a single control line is necessary and in which a measuring throttle in the air supply line can be dispensed with.
  • a premixing gas burner 1 according to FIG. 1 is connected to an inlet air line 2 and an exhaust gas line 3.
  • the air required for combustion is taken from an intake line 4 and fed to the supply air line 2 by a fan 5.
  • a fan 5 Via an air throttle 6, the air flows into a mixing chamber 7, which is followed by a distribution chamber 8, in which the air-gas mixture is fed to a surface burner 9.
  • a combustion chamber 10 In the direction of flow behind this surface burner 9 there is a combustion chamber 10 in which a heat exchanger 11 is located.
  • the fuel gas is fed from a gas line 13 to the mixing chamber 7 via a throttle element 12.
  • the pressure in the gas line 13 is regulated by a gas pressure regulator 14 which has an input space 15 to which a shut-off valve 16 is connected.
  • the gas pressure regulator 14 comprises an output space 17, a target pressure chamber 18 and an actual pressure chamber 19.
  • a pre-pressure compensation membrane 20 separates the input space 15 from the actual pressure chamber 19 and a working membrane 21 separates the actual pressure chamber 19 from the target pressure chamber 18.
  • the target pressure chamber 18 stands Via a control line 22 in connection with the supply air line 2 and a return line 23 connects the outlet space 17 with the actual pressure chamber 19.
  • the invention is based on the knowledge that the ratio of the air volume flow V L to the gas volume flow V G does not change if the ratio of the pressure difference p G -p M acting via the throttle element 12 to the pressure difference p L -p M acting via the air throttle 6 does not change. Since the volume flows V L and V G both flow into the same space, namely into the mixing space 7, the pressure differences p G -p M and p L -p M are only the same if the gas pressure p G is equal to the air pressure p L is. This condition is met by the gas pressure regulator 14, on the working membrane 21 of which the gas pressure p G is compared with the air pressure p L , which represents the reference variable. If the gas pressure p G deviates from the air pressure p L , the actuator of the gas pressure regulator 14 is moved through the working membrane 21 so that the difference p G -p L approaches zero. The gas pressure regulator 14 is therefore a constant pressure regulator.
  • the ratio of the air volume flow V L to the gas volume flow V G does not change in such an arrangement even if the pressure p M in the mixing chamber 7 varies as a result of different resistance of the surface burner 9 or the exhaust pipe 3 or because of changes in the heating surfaces of the heat exchanger 11.
  • the throttle element 12 In order to make the ratio of the gas volume flow V G to the air volume flow V L adjustable, for example with regard to different calorific values or Wobbe indices of the gas coming for combustion, it is advantageous to divide the throttle element 12 according to FIG. 2 into a series connection of a fixed one Throttle 12a with an adjustable throttle 12b. It is further advantageous to integrate the adjustable throttle 12b in the gas pressure regulator 14 so that the gas pressure regulator 14 and the adjustable throttle 12b form a structural unit.
  • FIG. 3 shows a further advantageous embodiment, namely of the type that the fixed throttle 12a (FIG. 2) and the air throttle 6 (FIG. 2) are arranged directly in the mixing chamber 7 and form a structural unit together with the mixing chamber 7.
  • the fixed throttle 12a is formed by bores 30 in a wall 31 of the mixing chamber 7, while the air throttle 6 is formed by a disk 32 adjacent to a wall 31 of the mixing chamber 7 with a plurality of bores 33 in the edge region of the disk 32.
  • the bores 33 are expediently opposite the Bores 30 offset in the middle of the gap.
  • throttles 40, 41, 43 form a structural unit with the gas pressure regulator 14. This makes it possible to be able to make optimal presettings at the factory.

Abstract

A device for controlling the mixture of fuel gas and air in pre-mixed gas burners contains a gas pressure governor (14) and a throttle member (12) in the gas flow. The gas pressure governor (14) is a balanced pressure governor which can be controlled by the pressure in an incoming air pipe (2). Also present in the incoming air pipe (2) is an air throttle (6), the pressure drop of which is the same size as the pressure drop across the throttle member (12) in the gas flow. The ratio of the air volume flow VL to the gas volume flow VG does not change when the ratio of the pressure difference pG-pM acting across the throttle member (12) to the pressure difference pL-pM acting across the air throttle (6) does not change, pG being the gas pressure, pM the pressure in the mixing chamber (7) and pL the air pressure in the incoming air pipe (2). As the volume flows VL and VG both flow into the same chamber, namely into the mixing chamber (7), the pressure differences pG-pM and pL-pM are only equal when the gas pressure pG is equal to the air pressure pL. This condition is met by the gas pressure governor (14). Such devices can be used in forced-draught gas burners for heating water and service water preparation. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Gemischregelung der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a device for mixture control of the type mentioned in the preamble of claim 1.

Solche Vorrichtungen werden vorteilhaft bei Gasbrennern verwendet, bei denen mittels eines Gebläses eine Druckdifferenz zwischen dem Brennraum und der Atmosphäre erzeugt wird. Dabei kann das Gebläse in der Zuluft- oder in der Abluftleitung oder unmittelbar vor dem Brenner angeordnet sein.Such devices are advantageously used in gas burners in which a pressure difference between the combustion chamber and the atmosphere is generated by means of a fan. The blower can be arranged in the supply air or exhaust air line or directly in front of the burner.

Eine Vorrichtung der im Oberbegriff des Anspruchs 1 genannten Art ist aus der EP-OS 0 275 568 bekannt. Hier wird für die Gemischregelung ein Gasdruckregler verwendet, der von einem Differenzdrucksignal angesteuert wird, das an einer Blende in der Verbrennungsluftleitung abgenommen wird. Das Meßelement in der Luftleitung erzeugt zusätzlichen Druckverlust, weshalb ein entsprechend stärkeres Gebläse verwendet werden muß. Ferner sind zwei Steuerleitungen erforderlich, um das Differenzdrucksignal auf den Gasdruckregler zu übertragen. Zur Anpassung des Systems an Brenngase mit unterschiedlichem Heizwert oder Wobbe-Index müssen entweder der Durchmesser der Drossel in der Gasleistung bzw. in der Luftleitung angepaßt werden oder das Flächenverhältnis der mit Gas und Luft beaufschlagten Membranen verändert werden.A device of the type mentioned in the preamble of claim 1 is known from EP-OS 0 275 568. Here, a gas pressure regulator is used for the mixture control, which is controlled by a differential pressure signal, which is taken from a panel in the combustion air line. The measuring element in the air line generates additional pressure loss, which is why a correspondingly stronger fan must be used. Two control lines are also required to transmit the differential pressure signal to the gas pressure regulator. To adapt the system to fuel gases with different calorific values or Wobbe index, either the diameter of the throttle in the gas output or in the air line must be adjusted or the area ratio of the membranes loaded with gas and air must be changed.

Aus der DE-Z "Gas wärme international", 37 (1988), Heft 10, S. 551-563 sind Verhältnisdruckregler bekannt, bei denen der Luftdruck die Führungsgröße für den Gasdruck ist, wobei aber zur Kompensation der Feuerraumdruck an den Druckregler angeschlossen werden muß. An diese Verbindungsleitung und deren Anordnung zwischen Brenner bzw. Kessel und Gasdruckregler werden hohe Anforderungen gestellt, um eine Verfälschung der Signalübertragung durch Kondensat zu vermeiden.From DE-Z "Gas warm international", 37 (1988), Issue 10, pp. 551-563 ratio pressure regulators are known in which the air pressure is the reference variable for the gas pressure, but for compensation the combustion chamber pressure is connected to the pressure regulator got to. High demands are placed on this connecting line and its arrangement between the burner or boiler and gas pressure regulator in order to prevent the signal transmission from being falsified by condensate.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, bei der statt zweier Steuerleitungen zwischen Luftzufuhrleitung und Druckregler nur eine einzige Steuerleitung nötig ist und bei der auf eine Meßdrossel in der Luftzufuhrleitung verzichtet werden kann.The invention has for its object to provide a device in which instead of two control lines between the air supply line and pressure regulator only a single control line is necessary and in which a measuring throttle in the air supply line can be dispensed with.

Die genannte Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen.According to the invention, the stated object is achieved by the features of claim 1. advantageous embodiments result from the subclaims.

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand der Zeichnung näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawing.

Es zeigen:

Fig. 1
ein Schema einer Vorrichtung zur Gemischregelung,
Fig. 2
ein Schema einer Vorrichtung mit einer festen und einer einstellbaren Drossel,
Fig. 3
eine Anordnung von Drosseln in einer Mischkammer und
Fig. 4
ein Schema einer Kombination mehrerer Drosselorgane.
Show it:
Fig. 1
a diagram of a device for mixture control,
Fig. 2
a diagram of a device with a fixed and an adjustable throttle,
Fig. 3
an arrangement of chokes in a mixing chamber and
Fig. 4
a diagram of a combination of several throttle bodies.

Ein vormischender Gasbrenner 1 gemäß der Fig. 1 ist an eine Zuluftleitung 2 und eine Abgasleitung 3 angeschlossen. Die zur Verbrennung nötige Luft wird von einer Ansaugleitung 4 entnommen und durch ein Gebläse 5 der Zuluftleitung 2 zugeführt. Über eine Luftdrossel 6 strömt die Luft in einen Mischraum 7, an den sich ein Verteilraum 8 anschließt, in dem das Luft-Gas-Gemisch einem Flächenbrenner 9 zugeführt wird. In Strömungsrichtung hinter diesem Flächenbrenner 9 befindet sich ein Brennraum 10, in dem sich ein Wärmetauscher 11 befindet.A premixing gas burner 1 according to FIG. 1 is connected to an inlet air line 2 and an exhaust gas line 3. The air required for combustion is taken from an intake line 4 and fed to the supply air line 2 by a fan 5. Via an air throttle 6, the air flows into a mixing chamber 7, which is followed by a distribution chamber 8, in which the air-gas mixture is fed to a surface burner 9. In the direction of flow behind this surface burner 9 there is a combustion chamber 10 in which a heat exchanger 11 is located.

Dem Mischraum 7 wird über ein Drosselorgan 12 das Brenngas aus einer Gasleitung 13 zugeführt. Der Druck in der Gasleitung 13 wird von einem Gasdruckregler 14 geregelt, der einen Eingangsraum 15 aufweist, an den ein Absperrventil 16 angeschlossen ist. Der Gasdruckregler 14 umfaßt neben dem Eingangsraum 15 einen Ausgangsraum 17, eine Solldruckkammer 18 und eine Istdruckkammer 19. Eine Vordruck-Ausgleichsmembran 20 trennt den Eingangsraum 15 von der Istdruckkammer 19 und eine Arbeitsmembran 21 trennt die Istdruckkammer 19 von der Solldruckkammer 18. Die Solldruckkammer 18 steht über eine Steuerleitung 22 mit der Zuluftleitung 2 in Verbindung und eine Rückführleitung 23 verbindet den Ausgangsraum 17 mit der Istdruckkammer 19.The fuel gas is fed from a gas line 13 to the mixing chamber 7 via a throttle element 12. The pressure in the gas line 13 is regulated by a gas pressure regulator 14 which has an input space 15 to which a shut-off valve 16 is connected. In addition to the input space 15, the gas pressure regulator 14 comprises an output space 17, a target pressure chamber 18 and an actual pressure chamber 19. A pre-pressure compensation membrane 20 separates the input space 15 from the actual pressure chamber 19 and a working membrane 21 separates the actual pressure chamber 19 from the target pressure chamber 18. The target pressure chamber 18 stands Via a control line 22 in connection with the supply air line 2 and a return line 23 connects the outlet space 17 with the actual pressure chamber 19.

In der Zuluftleitung 2 und somit auch in der Steuerleitung 22 und in der Solldruckkammer 18 herrscht der Luftdruck pL, der auf die eine Seite der Arbeitsmembran 21 wirkt. Auf die andere Seite der Arbeitsmembran 21 wirkt der Gasdruck pG, der in der Istdruckkammer 19 und wegen der Rückführleitung 23 sowohl in dieser als auch im Ausgangsraum 17 und in der Gasleitung 13 herrscht. Im Mischraum 7 wirkt der Gemischdruck pM. Durch die Gasleitung 13 fließt ein Gasvolumenstrom VG und durch die Zuluftleitung 2 fließt ein Luftvolumenstrom VL.In the supply air line 2 and thus also in the control line 22 and in the target pressure chamber 18, there is the air pressure p L , which acts on one side of the working membrane 21. On the other side of the working membrane 21 acts the gas pressure p G , which prevails in the actual pressure chamber 19 and because of the return line 23 both in this and in the outlet space 17 and in the gas line 13. The mixture pressure p M acts in the mixing chamber 7. A gas volume flow V G flows through the gas line 13 and an air volume flow V L flows through the supply air line 2.

Der Erfindung liegt die Erkenntnis zugrunde, daß sich das Verhältnis des Luftvolumenstroms VL zum Gasvolumenstrom VG nicht ändert, wenn sich das Verhältnis der über das Drosselorgan 12 wirkenden Druckdifferenz pG-pM zur über die Luftdrossel 6 wirkenden Druckdifferenz pL-pM nicht ändert. Da die Volumenströme VL und VG beide in den gleichen Raum, nämlich in den Mischraum 7, fließen, sind die Druckdifferenzen pG-pM und pL-pM nur dann gleich, wenn der Gasdruck pG gleich dem Luftdruck pL ist. Diese Bedingung wird vom Gasdruckregler 14 erfüllt, an dessen Arbeitsmembran 21 der Vergleich des Gasdrucks pG mit dem Luftdruck pL, der die Führungsgröße darstellt, erfolgt. Weicht der Gasdruck pG vom Luftdruck pL ab, so wird das Stellorgan des Gasdruckreglers 14 durch die Arbeitsmembran 21 so bewegt, daß die Differenz pG-pL gegen Null geht. Der Gasdruckregler 14 ist also ein Gleichdruckregler.The invention is based on the knowledge that the ratio of the air volume flow V L to the gas volume flow V G does not change if the ratio of the pressure difference p G -p M acting via the throttle element 12 to the pressure difference p L -p M acting via the air throttle 6 does not change. Since the volume flows V L and V G both flow into the same space, namely into the mixing space 7, the pressure differences p G -p M and p L -p M are only the same if the gas pressure p G is equal to the air pressure p L is. This condition is met by the gas pressure regulator 14, on the working membrane 21 of which the gas pressure p G is compared with the air pressure p L , which represents the reference variable. If the gas pressure p G deviates from the air pressure p L , the actuator of the gas pressure regulator 14 is moved through the working membrane 21 so that the difference p G -p L approaches zero. The gas pressure regulator 14 is therefore a constant pressure regulator.

Das Verhältnis des Luftvolumenstroms VL zum Gasvolumenstrom VG ändert sich bei einer solchen Anordnung auch dann nicht, wenn der Druck pM im Mischraum 7 infolge unterschiedlichen Widerstands des Flächenbrenners 9 oder der Abgasleitung 3 oder wegen Veränderungen an den Heizflächen des Wärmetauschers 11 variiert.The ratio of the air volume flow V L to the gas volume flow V G does not change in such an arrangement even if the pressure p M in the mixing chamber 7 varies as a result of different resistance of the surface burner 9 or the exhaust pipe 3 or because of changes in the heating surfaces of the heat exchanger 11.

Erwähnt sei, daß die Lastverstellung bei einer solchen Vorrichtung durch Drehzahlregelung des Gebläses 5 erfolgt. Dadurch werden je nach Drehzahl des Gebläses 5 unterschiedliche Luftdrucke pL und somit auch unterschiedliche Luftvolumenströme VL erzeugt. Durch den Gasdruckregler 14 wird dabei der Gasdruck pG und damit auch der Gasvolumenstrom VG nachgeführt.It should be mentioned that in such a device the load is adjusted by regulating the speed of the fan 5. As a result, 5 different air pressures p L and thus also different air volume flows V L are generated depending on the speed of the fan. By the gas pressure regulator 14 while the gas pressure p G, and thus the gas volume flow V G is tracked.

Es ist aber auch möglich, ein Gebläse 5 mit konstanter Drehzahl anzuwenden und dabei in bekannter Weise den Luftvolumenstrom mittels einer Drosselklappe zu steuern oder zu regeln.However, it is also possible to use a fan 5 with a constant speed and to control or regulate the air volume flow in a known manner by means of a throttle valve.

Um das Verhältnis des Gasvolumenstroms VG zum Luftvolumenstrom VL beispielsweise im Hinblick auf unterschiedliche Brennwerte bzw. Wobbe-Indizes des zur Verbrennung kommenden Gases einstellbar machen zu können, ist es vorteilhaft, das Drosselorgan 12 gemäß der Fig. 2 aufzuteilen in eine Reihenschaltung einer festen Drossel 12a mit einer einstellbaren Drossel 12b. Dabei ist es weiter vorteilhaft, die einstellbare Drossel 12b in den Gasdruckregler 14 zu integrieren, so daß Gasdruckregler 14 und einstellbare Drossel 12b eine Baueinheit bilden.In order to make the ratio of the gas volume flow V G to the air volume flow V L adjustable, for example with regard to different calorific values or Wobbe indices of the gas coming for combustion, it is advantageous to divide the throttle element 12 according to FIG. 2 into a series connection of a fixed one Throttle 12a with an adjustable throttle 12b. It is further advantageous to integrate the adjustable throttle 12b in the gas pressure regulator 14 so that the gas pressure regulator 14 and the adjustable throttle 12b form a structural unit.

Die Fig. 3 zeigt eine weitere vorteilhafte Ausgestaltung, nämlich der Art, daß die feste Drossel 12a (Fig. 2) und die Luftdrossel 6 (Fig. 2) unmittelbar im Mischraum 7 angeordnet sind und zusammen mit dem Mischraum 7 eine Baueinheit bilden. Die feste Drossel 12a wird dabei gebildet durch Bohrungen 30 in einer Wandung 31 des Mischraums 7, während die Luftdrossel 6 durch eine an eine Wandung 31 des Mischraums 7 angrenzende Scheibe 32 mit einer Vielzahl von Bohrungen 33 im Randbereich der Scheibe 32 gebildet wird. Vorteilhaft ist dies besonders im Hinblick auf die für den Flächenbrenner 9 gewünschte vollständige Durchmischung von Brenngas und Luft. Zweckmäßigerweise sind dabei die Bohrungen 33 gegenüber den Bohrungen 30 auf Lücke mittig versetzt.FIG. 3 shows a further advantageous embodiment, namely of the type that the fixed throttle 12a (FIG. 2) and the air throttle 6 (FIG. 2) are arranged directly in the mixing chamber 7 and form a structural unit together with the mixing chamber 7. The fixed throttle 12a is formed by bores 30 in a wall 31 of the mixing chamber 7, while the air throttle 6 is formed by a disk 32 adjacent to a wall 31 of the mixing chamber 7 with a plurality of bores 33 in the edge region of the disk 32. This is particularly advantageous with regard to the complete mixing of fuel gas and air desired for the surface burner 9. The bores 33 are expediently opposite the Bores 30 offset in the middle of the gap.

Es ist vorteilhaft, die einstellbare Drossel 12b gemäß der Fig. 4 zu ersetzen durch eine Parallelschaltung einer ersten fest einstellbaren Drossel 40 und einer Reihenschaltung einer zweiten fest einstellbaren Drossel 41 mit einer durch einen Antrieb 42 steuerbaren Drossel 43. Dadurch wird der Gasvolumenstrom VG aufgeteilt in zwei Teilströme, von denen der eine steuerbar ist. Dies ermöglicht es, den Gasvolumenstrom VG nachzuregeln durch Einflußgrößen, die die Verbrennung beeinflussen und/oder die die Güte der Verbrennung charakterisieren. Solche Einflußgrößen sind einerseits beispielsweise die Zulufttemperatur, andererseits zum Beispiel der Sauerstoff- und/oder Kohlenmonoxidgehalt des Abgases. Weiterhin ist es möglich, den Gasvolumenstrom VG in Abhängigkeit vom Heizwert oder Wobbe-Index zu steuern.It is advantageous to replace the adjustable throttle 12b according to FIG. 4 by a parallel connection of a first fixedly adjustable throttle 40 and a series connection of a second fixedly adjustable throttle 41 with a throttle 43 which can be controlled by a drive 42. This divides the gas volume flow V G in two sub-streams, one of which is controllable. This makes it possible to readjust the gas volume flow V G by influencing variables which influence the combustion and / or which characterize the quality of the combustion. Such influencing variables are, on the one hand, for example the supply air temperature, on the other hand, for example, the oxygen and / or carbon monoxide content of the exhaust gas. It is also possible to control the gas volume flow V G depending on the calorific value or Wobbe index.

Vorteilhaft ist es, wenn die Drosseln 40, 41, 43 mit dem Gasdruckregler 14 eine Baueinheit bilden. Dadurch ist es möglich, bereits werksseitig optimale Voreinstellungen vornehmen zu können.It is advantageous if the throttles 40, 41, 43 form a structural unit with the gas pressure regulator 14. This makes it possible to be able to make optimal presettings at the factory.

Claims (6)

Vorrichtung zur Gemischregelung von Brenngas und Luft bei vormischenden Gasbrennern mit einer Zuluftleitung (2), einem Gasdruckregler (14) und einem Drosselorgan (12) im Gasstrom, wobei Gas und Luft in einen Mischraum (7) strömen, dadurch gekennzeichnet, daß der Gasdruckregler (14) ein Gleichdruckregler ist, der vom Druck in der Zuluftleitung (2) steuerbar ist, und daß eine Luftdrossel (6) in der Luftzuleitung (2) vorhanden ist, deren Druckabfall gleich groß ist wie der Druckabfall über dem Drosselorgan (12; 12a, 12b; 40, 41, 43) im Gasstrom.Device for regulating the mixture of fuel gas and air in premixing gas burners with an air supply line (2), a gas pressure regulator (14) and a throttle element (12) in the gas stream, gas and air flowing into a mixing chamber (7), characterized in that the gas pressure regulator ( 14) is a constant pressure regulator which can be controlled by the pressure in the supply air line (2) and that an air throttle (6) is present in the air supply line (2), the pressure drop of which is the same as the pressure drop across the throttle element (12; 12a, 12b; 40, 41, 43) in the gas stream. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Drosselorgan (12) im Gasstrom gebildet ist von einer festen Drossel (12a) und einer einstellbaren Drossel (12b).Device according to claim 1, characterized in that the throttle member (12) in the gas stream is formed by a fixed throttle (12a) and an adjustable throttle (12b). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die einstellbare Drossel (12b) mit dem Gasdruckregler (14) eine Baueinheit bildet.Device according to claim 2, characterized in that the adjustable throttle (12b) forms a structural unit with the gas pressure regulator (14). Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die feste Drossel (12a) im Gasstrom und die Luftdrossel (6) im Mischraum (7) angeordnet sind.Apparatus according to claim 2 or 3, characterized in that the fixed throttle (12a) in the gas flow and the air throttle (6) are arranged in the mixing chamber (7). Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die einstellbare Drossel (12b) im Gasstrom gebildet ist durch eine Parallelschaltung einer ersten fest einstellbaren Drossel (40) und einer Reihenschaltung einer zweiten fest einstellbaren Drossel (41) mit einer durch einen Antrieb (42) steuerbaren Drossel (43).Apparatus according to claim 2 or 3, characterized in that the adjustable throttle (12b) is formed in the gas flow by a parallel connection of a first fixed throttle (40) and a series connection of a second fixed throttle (41) with a drive (42 ) controllable throttle (43). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Drosseln (40, 41, 43) mit dem Gasdruckregler (14) eine Baueinheit bilden.Apparatus according to claim 5, characterized in that the throttles (40, 41, 43) form a structural unit with the gas pressure regulator (14).
EP90124419A 1990-04-04 1990-12-17 Mixture control device for a pre-mixed gas burner Withdrawn EP0450173A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1140/90 1990-04-04
CH1140/90A CH680749A5 (en) 1990-04-04 1990-04-04

Publications (1)

Publication Number Publication Date
EP0450173A1 true EP0450173A1 (en) 1991-10-09

Family

ID=4203427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124419A Withdrawn EP0450173A1 (en) 1990-04-04 1990-12-17 Mixture control device for a pre-mixed gas burner

Country Status (2)

Country Link
EP (1) EP0450173A1 (en)
CH (1) CH680749A5 (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578578A1 (en) * 1992-07-10 1994-01-12 Selas Corporation Of America Apparatus and method for mixing gases
EP0626541A1 (en) * 1993-05-28 1994-11-30 Ranco Incorporated Of Delaware Gas/air ratio control apparatus for a temperature control loop for gas appliances
EP0724117A1 (en) * 1995-01-30 1996-07-31 Landis &amp; Gyr Technology Innovation AG Control device for a gas power burner
EP0801270A2 (en) * 1996-04-10 1997-10-15 ZELTRON S.p.A. Gas fuelled heating unit for household and similar appliances
EP0887590A1 (en) * 1997-06-27 1998-12-30 Compagnie Europeenne Pour L'equipement Menager "Cepem" Total premixing type gas burner for domestic cooking
DE19859283A1 (en) * 1998-12-22 2000-07-06 Bosch Gmbh Robert Blower premix burner operation supplements gas at ignition by volume choke using regulator valve parameter choke controling enrichment valve volume and timing.
WO2005024302A1 (en) * 2003-09-08 2005-03-17 Sit La Precisa S.P.A. A system for controlling the delivery of a fuel gas to a burner apparatus
EP1584870A2 (en) * 2004-04-08 2005-10-12 Karl Dungs GmbH & Co.KG Gas valve with time-delayed fuel supply
US20140124587A1 (en) * 2012-11-05 2014-05-08 Pat Caruso Modulating burner system
CN110582673A (en) * 2018-03-07 2019-12-17 依必安派特兰茨胡特有限公司 Method for identifying a gas type during the start-up of a gas-operated heater and gas-operated heater
US11287131B2 (en) * 2018-08-28 2022-03-29 Ademco Inc. Method for operating a gas burner appliance
DE102020132504A1 (en) 2020-12-07 2022-06-09 Ebm-Papst Landshut Gmbh throttle assembly
WO2022183429A1 (en) * 2021-03-04 2022-09-09 Pittway Sarl Partially-premixed gas burner appliance
EP4170235A1 (en) * 2021-10-20 2023-04-26 ebm-papst Landshut GmbH Method for evaluating a unsteady pressure difference detected by a sensor at a gas heater and corresponding gas heater
EP4174373A1 (en) * 2021-10-27 2023-05-03 Vaillant GmbH Method for starting up a heating device, heating device, computer program and ma-schine-readable storage medium
EP4191135A1 (en) * 2021-12-02 2023-06-07 Bosch Thermotechnology Ltd (UK) An air-gas mixing unit for an air-gas mixture burning appliance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1405093A (en) * 1971-09-18 1975-09-03 Stordy Combustion Eng Ltd Control of fuel supply to a burner
GB1507020A (en) * 1975-05-06 1978-04-12 British Gas Corp Apparatus for the control of gas/air flow ratio in a burner system
GB2018970A (en) * 1978-04-17 1979-10-24 Matsushita Electric Ind Co Ltd Combustion control apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1405093A (en) * 1971-09-18 1975-09-03 Stordy Combustion Eng Ltd Control of fuel supply to a burner
GB1507020A (en) * 1975-05-06 1978-04-12 British Gas Corp Apparatus for the control of gas/air flow ratio in a burner system
GB2018970A (en) * 1978-04-17 1979-10-24 Matsushita Electric Ind Co Ltd Combustion control apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GAS W[RME INTERNATIONAL, vol. 37, no. 10, November 1988, Seiten 5516 - 563; (J. ROLKER): "]berwachung und Regelung von Industriegasbrennern" *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578578A1 (en) * 1992-07-10 1994-01-12 Selas Corporation Of America Apparatus and method for mixing gases
EP0626541A1 (en) * 1993-05-28 1994-11-30 Ranco Incorporated Of Delaware Gas/air ratio control apparatus for a temperature control loop for gas appliances
US5630408A (en) * 1993-05-28 1997-05-20 Ranco Incorporated Of Delaware Gas/air ratio control apparatus for a temperature control loop for gas appliances
EP0724117A1 (en) * 1995-01-30 1996-07-31 Landis &amp; Gyr Technology Innovation AG Control device for a gas power burner
EP0801270A2 (en) * 1996-04-10 1997-10-15 ZELTRON S.p.A. Gas fuelled heating unit for household and similar appliances
EP0801270A3 (en) * 1996-04-10 1999-10-27 ZELTRON S.p.A. Gas fuelled heating unit for household and similar appliances
EP0887590A1 (en) * 1997-06-27 1998-12-30 Compagnie Europeenne Pour L'equipement Menager "Cepem" Total premixing type gas burner for domestic cooking
FR2765313A1 (en) * 1997-06-27 1998-12-31 Europ Equip Menager TOTAL PREMIX GAS BURNER FOR DOMESTIC COOKING
DE19859283A1 (en) * 1998-12-22 2000-07-06 Bosch Gmbh Robert Blower premix burner operation supplements gas at ignition by volume choke using regulator valve parameter choke controling enrichment valve volume and timing.
DE19859283C2 (en) * 1998-12-22 2001-02-15 Bosch Gmbh Robert Device for mixing gas and air for a burner
WO2005024302A1 (en) * 2003-09-08 2005-03-17 Sit La Precisa S.P.A. A system for controlling the delivery of a fuel gas to a burner apparatus
EP1584870A2 (en) * 2004-04-08 2005-10-12 Karl Dungs GmbH & Co.KG Gas valve with time-delayed fuel supply
EP1584870A3 (en) * 2004-04-08 2008-04-30 Karl Dungs GmbH & Co.KG Gas valve with time-delayed fuel supply
US20140124587A1 (en) * 2012-11-05 2014-05-08 Pat Caruso Modulating burner system
US9528712B2 (en) * 2012-11-05 2016-12-27 Pat Caruso Modulating burner system
CN110582673A (en) * 2018-03-07 2019-12-17 依必安派特兰茨胡特有限公司 Method for identifying a gas type during the start-up of a gas-operated heater and gas-operated heater
US11287131B2 (en) * 2018-08-28 2022-03-29 Ademco Inc. Method for operating a gas burner appliance
DE102020132504A1 (en) 2020-12-07 2022-06-09 Ebm-Papst Landshut Gmbh throttle assembly
WO2022122279A1 (en) 2020-12-07 2022-06-16 Ebm-Papst Landshut Gmbh Throttle arrangement, heating unit with the throttle arrangement, method for regulating a heating unit with the throttle arrangement, and orifice measuring path with the throttle arrangement
WO2022183429A1 (en) * 2021-03-04 2022-09-09 Pittway Sarl Partially-premixed gas burner appliance
EP4170235A1 (en) * 2021-10-20 2023-04-26 ebm-papst Landshut GmbH Method for evaluating a unsteady pressure difference detected by a sensor at a gas heater and corresponding gas heater
EP4174373A1 (en) * 2021-10-27 2023-05-03 Vaillant GmbH Method for starting up a heating device, heating device, computer program and ma-schine-readable storage medium
EP4191135A1 (en) * 2021-12-02 2023-06-07 Bosch Thermotechnology Ltd (UK) An air-gas mixing unit for an air-gas mixture burning appliance

Also Published As

Publication number Publication date
CH680749A5 (en) 1992-10-30

Similar Documents

Publication Publication Date Title
EP0450173A1 (en) Mixture control device for a pre-mixed gas burner
EP1179159B1 (en) Regulating device for gas burners
DE19740666C1 (en) Pressure regulator for maintaining an air fuel ratio for a gas burner
EP1112461B1 (en) Method for operating a burner and burner arrangement
EP0644377A1 (en) Control device for gas burners
EP1510756A1 (en) Ratio Controller with Dynamic Ratio Evaluation
EP0898064B1 (en) Gas engine
EP1882882A2 (en) Flowrate regulating device
DE2932436C2 (en) Mass flow-dependent gas analyzer with flow control in negative pressure operation
DE1473087C3 (en) Device for regulating the mass flow rate of a compressible gaseous medium in a main flow channel
EP0505714B1 (en) Control device for a gas burner with a fan for supplying combustion air
DE2708858A1 (en) Regulator for fluid fuel fired burner - has diaphragm chambers with adjustable resistors in inlet and outlet channels
EP0969192B1 (en) Method to equalize the fuel distribution in a gas turbine with several burners
DE3839163A1 (en) CARBURETOR ARRANGEMENT
DE2209779C3 (en) Hot gas piston engine in which the fuel supply to the burner device is regulated by means of a control device that reacts to at least one parameter of the engine
EP0015480B1 (en) Device for the regulation of gas-firing mixtures
DE3634449A1 (en) Instrument for controlling or regulating a mass flow of a gaseous or vaporous or liquid medium
DE3006683C2 (en)
EP0340611B1 (en) Device for combustion air supply controlling
DE2834242A1 (en) Blower type burner automatic regulator - controls gas and air supply to ensure optimum mixture composition over working range by air pressure sensor
EP0024444A1 (en) Device for regulating the mixture ratio of combustion gas and air in gas burners
EP0866270A2 (en) Gas-fired heating apparatus, especially a water heater
DE3303915A1 (en) Regulating apparatus for an oil burner
DE102020132504A1 (en) throttle assembly
DE102020132503A1 (en) Method for adjusting an air-fuel mixture for heaters

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920410