EP1084369A1 - Gas burner regulating system - Google Patents

Gas burner regulating system

Info

Publication number
EP1084369A1
EP1084369A1 EP99955316A EP99955316A EP1084369A1 EP 1084369 A1 EP1084369 A1 EP 1084369A1 EP 99955316 A EP99955316 A EP 99955316A EP 99955316 A EP99955316 A EP 99955316A EP 1084369 A1 EP1084369 A1 EP 1084369A1
Authority
EP
European Patent Office
Prior art keywords
gas
line
combustion air
control device
flow
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.)
Granted
Application number
EP99955316A
Other languages
German (de)
French (fr)
Other versions
EP1084369B1 (en
Inventor
Enno Vrolijk
Tom Gerretsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garrett Motion SARL
Original Assignee
Honeywell BV
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
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Application filed by Honeywell BV filed Critical Honeywell BV
Publication of EP1084369A1 publication Critical patent/EP1084369A1/en
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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
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel 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
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • 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
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements

Definitions

  • the invention relates to a control device for gas burners according to the preamble of claim 1.
  • Control devices for gas burners are used to provide a gas / air mixture, that is to say to supply a gas stream and a ner combustion air stream to a burner.
  • the gas flow through a gas valve is adjustable depending on the nerbrennimgs air pressure.
  • Control devices for gas burners of the above type are known from the prior art, for. B. EP 0 390 964 AI, well known.
  • the pressure is determined using a membrane, that is to say pneumatically.
  • the gas flow through the gas valve is regulated.
  • this pneumatic route has a number of disadvantages, all of which limit the scope of known control devices.
  • the hysteresis properties of the membrane and the forces acting between the membrane and the gas valve limit the working area and thus the area of application.
  • the interplay between the required small actuating forces and the operating tolerances of the membrane as a result of disturbing influences such as temperature fluctuations or the like results in a restriction of the range of use of known control devices.
  • the present invention is based on the problem of creating a regulating device for gas burners which avoids the above disadvantages and thus has a larger area of application.
  • Fig. 1 shows a control device according to the invention with further assemblies according to a first embodiment of the invention in a schematic representation
  • Fig. 2 shows a control device according to the invention with further assemblies according to a second embodiment of the invention also in a schematic representation.
  • the present invention relates to control devices for gas burners.
  • a gas / air mixture is to be fed to a burner (not shown).
  • a first line 10 is provided which leads the gas flow to the burner.
  • a gas valve 11 is assigned to the first line 10.
  • the combustion air is fed to the burner (not shown) via a second line 12.
  • the second line 12 consequently leads the ner combustion air flow to the burner.
  • a fan 13 is assigned to the second line 12. The speed of the fan 13 determines the ner combustion air pressure and thus the ner combustion air flow.
  • a diaphragm or throttle point 14 is arranged within the second line 12 carrying the ner combustion air flow.
  • the first line 10 carrying the gas flow opens in the flow direction of the combustion air behind the throttle point 14 into the second line 12 carrying the ner combustion air flow.
  • a gas nozzle 15 closes off the first line 10 in the region of the second line 12.
  • a gas / air mixture is consequently present behind the gas nozzle 15 in the direction of flow.
  • the gas pressure is also to be increased by 1 mbar.
  • the sensor 16 is designed as a differential pressure sensor, in particular as a flow meter, anemometer or the like.
  • first measuring point 17 the sensor 16 is connected to the first line 10 carrying the gas flow.
  • second measuring point 18 the sensor 16 is connected to the second line 12 carrying the combustion air flow.
  • the first measuring point 17 is positioned in front of the gas nozzle 15 in the direction of flow of the gas.
  • the second measuring point 18 is arranged in the flow direction of the combustion air in front of the throttle point 14.
  • the gas pressure must correspond to the combustion air pressure.
  • the sensor 16 is designed as a flow meter or anemometer, this means that the flow through the sensor 16 is zero.
  • the sensor 16 experiences a flow from the first line 10 in the direction of the second line 12.
  • the sensor 16 experiences a flow from the second line 12 in the direction to the first line 10.
  • the pressure ratios between the combustion air pressure and the gas pressure can thus be determined by the sensor 16.
  • the sensor 16 Depending on the above pressure conditions, the sensor 16 generates an electrical or electronic signal 19 which is used to adjust the gas valve 11. According to FIG. 1, the electrical or electronic signal 19 is fed to a control or regulating device 20, which generates a control signal 21 from the signal 19 for an actuator 22 assigned to the gas valve 11.
  • the control device shown in FIG. 1 consequently follows the combustion air pressure in order to regulate the gas flow through the gas valve 11 in such a way that a 1: 1 gas / air combination control is achieved.
  • the sensor 16 detects a pressure difference of zero between combustion air pressure and gas pressure, the signal 19 corresponds to a pressure difference of zero and the gas valve 11 can be operated unchanged.
  • the sensor 16 detects a combustion air pressure that is higher than the gas pressure, the gas or valve 11 must be controlled with the aid of the electrical or electronic signal 19 generated by the sensor 16 in such a way that the gas flow increases.
  • the control unit 20 generates a control signal 21 for the actuator 22 of the gas valve 11, such that the signal 19 is again routed to an amount that corresponds to a pressure difference of zero.
  • the sensor 16 detects a reduced combustion air pressure compared to the gas pressure, the gas valve 11 must be controlled with the aid of the electrical or electronic signal generated by the sensor 16 such that the gas flow is reduced.
  • the gas valve 11 can be of any design.
  • the actuator 22 of the gas valve 11 is controlled or regulated in such a way that the gas valve 11 switches back and forth between the on / off and on / off states. If the combustion air pressure is higher than the gas pressure, a control signal 21 will accordingly be generated, on the basis of which the actuator 22 opens or activates the gas valve 11. On the other hand, if the combustion air pressure is lower than the gas pressure, the actuator 22 will close or deactivate the gas valve 11 on the basis of the control signal 21.
  • a resulting oscillating signal provides information about the correct functioning of the control system and can therefore be used as a safety signal. As long as the oscillating sensor signal is present, a safety valve (not shown) upstream of the gas valve 11 can be activated or opened.
  • the control device shown in FIG. 1 can be used to measure the air volume in the case in which the gas valve 11 is closed.
  • the pressure difference across the throttle point 14 can therefore be determined with the aid of the sensor 16 and an air quantity measurement can thus be carried out.
  • the air quantity measurement can be used to set the parameter range of the fan 13 depending on a configuration of the combustion air supply and flue gas discharge.
  • the air volume measurement also serves to monitor and set a minimum supply of combustion air, which is required to start the gas burner safely.
  • a different transmission ratio can exist between the exemplary embodiment according to FIG Gas flow and air flow can be realized, i.e. a 1: N gas / air compound control.
  • a coupling line 23 is provided between the first line 10 carrying the gas flow and the second line 12 carrying the combustion air flow, two constrictions 24, 25 being arranged within the coupling line 23.
  • the constrictions 24, 25 are throttling points.
  • the position of the constrictions 24, 25 in the coupling line 23 with respect to the lines 10, 12 is of minor importance. However, the flow resistance of the lines must be noticeably lower than the flow resistance of the constrictions 24, 25.
  • the coupling line 23 is connected to the second line 12 carrying the combustion air flow in the flow direction of the combustion air after or behind the throttle point 14.
  • the coupling line 23 is connected to the first line 10 carrying the gas flow in the flow direction of the gas in front of the gas nozzle 15.
  • the sensor 16 is arranged between the first line 10 and the second line 12, as in the exemplary embodiment according to FIG. 2, however, the first measuring point 17 is arranged in the area of the coupling line 23 between the constrictions 24, 25.
  • the second measuring point 18 is again arranged in the area of the second line 12 in the flow direction of the combustion air in front of the throttle point 14.
  • control device 20 also generates a control signal 21 for the actuator 22 of the gas valve 11 in such a way that the signal 19 of the sensor 16 is guided to an amount which corresponds to a pressure difference of zero.
  • a 1: N gas / air compound control can be implemented, i.e. that when the combustion air pressure increases by 1 mbar, the gas pressure is increased by N mbar.
  • the gas pressure can be increased in relation to the combustion air pressure.
  • the degree of reinforcement is determined by the constrictions 24, 25.
  • one of the constrictions 24, 25 can be variable or changeable. In this case it is possible, by changing or adjusting a constriction 24 or 25, to vary the transmission ratio between the combustion air flow and the gas flow or the amplification.

Abstract

The invention relates to a regulating system for a gas burner. Regulating systems for gas burners are used for guiding a gas flow and a combustion air flow to the burner. The gas flow can be regulated depending on combustion air pressure. Pressure is measured in known regulating devices with the aid of a membrane, that is pneumatically. Said pneumatic pressure measurement limits the scope of application of known regulating devices. In the inventive regulating device, a sensor (16) is arranged between a first line (10) guiding a gas flow and a second line (12) guiding the combustion air flow, an electric or electronic signal (19) being generated by said sensor that is used to regulate the gas valve (11).

Description

Regeleinrichtung für Gasbrenner Control device for gas burners
Die Erfindung betrifft eine Regeleinrichtung für Gasbrenner gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a control device for gas burners according to the preamble of claim 1.
Regeleinrichtungen für Gasbrenner dienen der Bereitstellung eines Gas/Luft-Gemisches, also dem Zuführen eines Gasstroms und eines Nerbrennungsluftstroms zu einem Brenner. Der Gasstrom durch ein Gasventil ist dabei in Abhängigkeit vom Nerbrennimgsluftdruck einstellbar.Control devices for gas burners are used to provide a gas / air mixture, that is to say to supply a gas stream and a ner combustion air stream to a burner. The gas flow through a gas valve is adjustable depending on the nerbrennimgs air pressure.
Regeleinrichtungen für Gasbrenner der obigen Art sind aus dem Stand der Technik, z. B. der EP 0 390 964 AI, hinlänglich bekannt. Bei der dort beschriebenen Regeleinrichtung erfolgt die Druckbestimmung mit Hilfe einer Membran, also auf pneumatischem Weg. Abhängig von dieser Druckmessung wird der Gasstrom durch das Gasventil geregelt. Dieser pneumatische Weg verfügt jedoch über eine Vielzahl von Nachteilen, die allesamt den Anwendungsbereich bekannter Regeleinrichtungen einschränken. So schränken die Hysterese-Eigenschaften der Membran und die zwischen der Membran und dem Gasventil wirkenden Kräfte den Arbeitsbereich und damit den Anwendungsbereich ein. Des weiteren bewirkt das Zusammenspiel zwischen den erforderlichen kleinen Stellkräften und den Betriebstoleranzen der Membran infolge von Störeinfiüssen wie Temperatuschwankungen oder dergleichen eine Einschränkung des Anwendungsbereichs bekannter Regeleinrichtungen.Control devices for gas burners of the above type are known from the prior art, for. B. EP 0 390 964 AI, well known. In the control device described there, the pressure is determined using a membrane, that is to say pneumatically. Depending on this pressure measurement, the gas flow through the gas valve is regulated. However, this pneumatic route has a number of disadvantages, all of which limit the scope of known control devices. The hysteresis properties of the membrane and the forces acting between the membrane and the gas valve limit the working area and thus the area of application. Furthermore, the interplay between the required small actuating forces and the operating tolerances of the membrane as a result of disturbing influences such as temperature fluctuations or the like results in a restriction of the range of use of known control devices.
Weitere Regeleinrichtungen für Gasbrenner sind aus der DE 24 27 819 AI und der DE 43 17 981 AI bekannt.Further control devices for gas burners are known from DE 24 27 819 AI and DE 43 17 981 AI.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, eine Regeleinrichtung für Gasbrenner zu schaffen, die die obigen Nachteile vermeidet und damit einen größeren Anwendungsbereich aufweist.Proceeding from this, the present invention is based on the problem of creating a regulating device for gas burners which avoids the above disadvantages and thus has a larger area of application.
Dieses Problem wird durch eine Regeleinrichtung für Gasbrenner mit den Merkmalen des Anspruchs 1 gelöst. Weitere vorteilhafte Ausgestalrungen der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung. Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:This problem is solved by a control device for gas burners with the features of claim 1. Further advantageous refinements of the invention result from the subclaims and the description. Preferred exemplary embodiments of the invention are explained in more detail below with reference to the drawing. The drawing shows:
Fig. 1 eine erfindungsgemäße Regeleinrichtung mit weiteren Baugruppen nach einem ersten Ausführungsbeispiel der Erfindung in schematisierter Darstellung, undFig. 1 shows a control device according to the invention with further assemblies according to a first embodiment of the invention in a schematic representation, and
Fig. 2 eine erfindungsgemäße Regeleinrichtung mit weiteren Baugruppen nach einem zweiten Ausführungsbeispiel der Erfindung ebenfalls in schematisierter Darstellung.Fig. 2 shows a control device according to the invention with further assemblies according to a second embodiment of the invention also in a schematic representation.
Die vorliegende Erfindung betrifft Regeleinrichtungen für Gasbrenner. Einem nicht- dargestellten Brenner soll ein Gas/Luft-Gemisch zugeführt werden. Um dem nicht- dargestellten Brenner einen Gasstrom zuzuführen, ist eine erste Leitung 10 vorgesehen, die den Gasstrom zum Brenner führt. Der ersten Leitung 10 ist ein Gasventil 11 zugeordnet.The present invention relates to control devices for gas burners. A gas / air mixture is to be fed to a burner (not shown). In order to supply a gas flow to the burner (not shown), a first line 10 is provided which leads the gas flow to the burner. A gas valve 11 is assigned to the first line 10.
Die Zuführung der Verbrennungsluft zum nicht-dargestellten Brenner erfolgt über eine zweite Leitung 12. Die zweite Leitung 12 führt demzufolge den Nerbrennungsluftstrom zum Brenner. Der zweiten Leitung 12 ist ein Gebläse 13 zugeordnet. Die Drehzahl des Gebläses 13 bestimmt den Nerbrennungsluftdruck und damit den Nerbrennungsluftstrom. Innerhalb der den Nerbrennungsluftstrom führenden zweiten Leitung 12 ist eine Blende oder Drosselstelle 14 angeordnet.The combustion air is fed to the burner (not shown) via a second line 12. The second line 12 consequently leads the ner combustion air flow to the burner. A fan 13 is assigned to the second line 12. The speed of the fan 13 determines the ner combustion air pressure and thus the ner combustion air flow. A diaphragm or throttle point 14 is arranged within the second line 12 carrying the ner combustion air flow.
Gemäß Figuren 1, 2 mündet die den Gasstrom führende erste Leitung 10 in Strömungsrichtung der Verbrennungsluft hinter der Drosselstelle 14 in die den Nerbrennungsluftstrom führende zweite Leitung 12. Eine Gasdüse 15 schließt die erste Leitung 10 im Bereich der zweiten Leitung 12 ab. In Strömungsrichtung hinter der Gasdüse 15 liegt demzufolge ein Gas/Luft-Gemisch vor.According to FIGS. 1, 2, the first line 10 carrying the gas flow opens in the flow direction of the combustion air behind the throttle point 14 into the second line 12 carrying the ner combustion air flow. A gas nozzle 15 closes off the first line 10 in the region of the second line 12. A gas / air mixture is consequently present behind the gas nozzle 15 in the direction of flow.
Bei dem in Figur 1 dargestellten Ausführungsbeispiel geht es nun darum, eine l:l-Gas/Luft- Verbundregelung bereitzustellen, d.h. bei einer Erhöhung des Verbrennungsluftdrucks von 1 Millibar (mbar) soll der Gasdruck ebenfalls um lmbar erhöht werden. Erfindungsgemäß ist hierzu zwischen der den Gasstrom führenden ersten Leitung 10 und der den Verbrennungsluftstrom führenden zweiten Leitung 12 ein Sensor 16 angeordnet. Der Sensor 16 ist als Differenzdruck-Sensor, insbesondere als Durchflußmesser, Anemometer oder dergleichen, ausgebildet.In the exemplary embodiment shown in FIG. 1, it is now a question of providing an 1: 1 gas / air composite control, ie if the combustion air pressure is increased by 1 millibar (mbar), the gas pressure is also to be increased by 1 mbar. According to the invention there is a sensor between the first line 10 carrying the gas flow and the second line 12 carrying the combustion air flow 16 arranged. The sensor 16 is designed as a differential pressure sensor, in particular as a flow meter, anemometer or the like.
Mit einem ersten Meßpunkt 17 ist der Sensor 16 an der den Gasstrom führenden ersten Leitung 10 angeschlossen. Mit einem zweiten Meßpunkt 18 ist der Sensor 16 an der den Verbrennungsluftstrom führenden zweiten Leitung 12 angeschlossen. In Strömungsrichtung des Gases ist der erste Meßpunkt 17 vor der Gasdüse 15 positioniert. Der zweite Meßpunkt 18 ist in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14 angeordnet.With a first measuring point 17, the sensor 16 is connected to the first line 10 carrying the gas flow. With a second measuring point 18, the sensor 16 is connected to the second line 12 carrying the combustion air flow. The first measuring point 17 is positioned in front of the gas nozzle 15 in the direction of flow of the gas. The second measuring point 18 is arranged in the flow direction of the combustion air in front of the throttle point 14.
Soll, wie bereits erwähnt, beim Ausführungsbeispiel gemäß Figur 1 für eine l :l-Gas/Luft- Verbundregelung gesorgt werden, so muß der Gasdruck dem Verbrennungsluftdruck entsprechen. In dem Fall, in dem der Sensor 16 als Durchflußmesser bzw. Anemometer ausgebildet ist, bedeutet dies, daß der Durchfluß durch den Sensor 16 Null beträgt. Nimmt z.B. der Verbrennungsluftdrack gegenüber dem Gasdruck ab, so erfährt der Sensor 16 einen Durchfluß von der ersten Leitung 10 in Richtung auf die zweite Leitung 12. Nimmt hingegen der Verbrennungsluftdruck gegenüber dem Gasdruck zu, so erfahrt der Sensor 16 einen Durchfluß von der zweiten Leitung 12 in Richtung auf die erste Leitung 10. Aufgrund der Durchflußmenge sowie auf Grund der Durchflußrichtung können demnach vom Sensor 16 die Druckverhältnisse zwischen Verbrennungsluftdruck und Gasdruck ermittelt werden.If, as already mentioned, a 1: 1 gas / air composite control is to be provided in the exemplary embodiment according to FIG. 1, the gas pressure must correspond to the combustion air pressure. In the case in which the sensor 16 is designed as a flow meter or anemometer, this means that the flow through the sensor 16 is zero. E.g. the combustion air pressure from the gas pressure, the sensor 16 experiences a flow from the first line 10 in the direction of the second line 12. On the other hand, if the combustion air pressure increases in relation to the gas pressure, the sensor 16 experiences a flow from the second line 12 in the direction to the first line 10. On the basis of the flow rate and on the basis of the flow direction, the pressure ratios between the combustion air pressure and the gas pressure can thus be determined by the sensor 16.
Der Sensor 16 erzeugt abhängig von den obigen Druckverhältnissen ein elektrisches bzw. elektronisches Signal 19, welches zur Verstellung des Gasventils 11 verwendet wird. Gemäß Figur 1 wird das elektrische bzw. elektronische Signal 19 einem Steuer- oder Regelgerät 20 zugeführt, das aus dem Signal 19 ein Regelungssignal 21 für einen dem Gasventil 11 zugeordneten Stellantrieb 22 erzeugt.Depending on the above pressure conditions, the sensor 16 generates an electrical or electronic signal 19 which is used to adjust the gas valve 11. According to FIG. 1, the electrical or electronic signal 19 is fed to a control or regulating device 20, which generates a control signal 21 from the signal 19 for an actuator 22 assigned to the gas valve 11.
Mit der in Figur 1 dargestellten Regeleinrichtung folgt man demzufolge dem Verbrennungsluftdruck, um den Gasstrom durch das Gasventil 11 derart zu regulieren, daß eine l:l-Gas/Luft- Verbundregelung erzielt wird. Detektiert der Sensor 16 zwischen Verbrennungsluftdruck und Gasdruck eine Druckdifferenz von Null, so entspricht das Signal 19 einer Druckdifferenz von Null und das Gasventil 11 kann unverändert betrieben werden. Detektiert der Sensor 16 einen gegenüber dem Gasdruck höheren Verbrennungsluftdruck, so muß mit Hilfe des vom Sensor 16 erzeugten elektrischen bzw. elektronischen Signals 19 das Gasventil 11 derart angesteuert werden, daß sich der Gasstrom erhöht. Hierzu erzeugt das Regelgerät 20 ein Regelungssignal 21 für den Stellantrieb 22 des Gasventils 11, derart, daß das Signal 19 wieder auf einen Betrag geführt wird, der einer Druckdifferenz von Null entspricht. Detektiert hingegen der Sensor 16 einen gegenüber dem Gasdruck verringerten Verbrennungsluftdruck, so muß mit Hilfe des vom Sensor 16 erzeugten elektrischen bzw. elektronischen Signals das Gasventil 11 derart angesteuert werden, daß sich der Gasstrom verringert.The control device shown in FIG. 1 consequently follows the combustion air pressure in order to regulate the gas flow through the gas valve 11 in such a way that a 1: 1 gas / air combination control is achieved. If the sensor 16 detects a pressure difference of zero between combustion air pressure and gas pressure, the signal 19 corresponds to a pressure difference of zero and the gas valve 11 can be operated unchanged. If the sensor 16 detects a combustion air pressure that is higher than the gas pressure, the gas or valve 11 must be controlled with the aid of the electrical or electronic signal 19 generated by the sensor 16 in such a way that the gas flow increases. For this purpose, the control unit 20 generates a control signal 21 for the actuator 22 of the gas valve 11, such that the signal 19 is again routed to an amount that corresponds to a pressure difference of zero. In contrast, the sensor 16 detects a reduced combustion air pressure compared to the gas pressure, the gas valve 11 must be controlled with the aid of the electrical or electronic signal generated by the sensor 16 such that the gas flow is reduced.
Das Gasventil 11 kann beliebig ausgebildet sein. Im einfachsten Fall wird der Stellantrieb 22 des Gasventils 11 derart gesteuert bzw. geregelt, daß das Gasventil 11 zwischen den Zuständen An/ Aus bzw. Auf/Zu hin- und herschaltet. Bei einem gegenüber dem Gasdruck höheren Verbrennungsluftdruck wird demzufolge ein Regelungssignal 21 erzeugt werden, auf Grund dessen der Stellantrieb 22 das Gasventil 11 öffnet bzw. aktiviert. Bei einem gegenüber dem Gasdruck geringeren Verbrennungsluftdruck hingegen wird aufgrund des Regelungssignals 21 der Stellantrieb 22 das Gasventil 11 hingegen schließen bzw. deaktivieren. Ein sich hieraus ergebendes oszillierendes Signal gibt Auskunft über die ordnungsgemäße Arbeitsweise des Regelungssystems und kann demzufolge als Sicherheitssignal verwendet werden. Solange wie das oszillierende Sensorsignal vorliegt, kann ein dem Gasventil 11 vorgeschaltetes, nicht-dargestelltes Sicherheitsventil aktiviert bzw. geöffnet sein.The gas valve 11 can be of any design. In the simplest case, the actuator 22 of the gas valve 11 is controlled or regulated in such a way that the gas valve 11 switches back and forth between the on / off and on / off states. If the combustion air pressure is higher than the gas pressure, a control signal 21 will accordingly be generated, on the basis of which the actuator 22 opens or activates the gas valve 11. On the other hand, if the combustion air pressure is lower than the gas pressure, the actuator 22 will close or deactivate the gas valve 11 on the basis of the control signal 21. A resulting oscillating signal provides information about the correct functioning of the control system and can therefore be used as a safety signal. As long as the oscillating sensor signal is present, a safety valve (not shown) upstream of the gas valve 11 can be activated or opened.
In Abweichung hiervon ist es auch möglich, das Gasventil 11 derart anzusteuern, daß das Gas ventil 11 zwischen den Zuständen An/ Aus bzw. Auf Zu beliebige Öffhungsstellungen einnehmen kann.In deviation from this, it is also possible to control the gas valve 11 in such a way that the gas valve 11 can assume any opening positions between the on / off and on states.
Die in Figur 1 dargestellte Regeleinrichtung kann in dem Fall, in dem das Gasventil 11 geschlossen ist, zur Luftmengenmessung verwendet werden. Diese gibt sich aus dem Umstand, daß der Sensor 16 mit dem zweiten Meßpunkt 18 an der zweiten Leitung 12, nämlich in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14, angeordnet ist; und weiterhin der Sensor 16 mit dem ersten Meßpunkt 17 an der ersten Leitung 10, also bei geschlossenem Gasventil 11 über die Gasdüse 15 in Strömungsrichtung der Verbrennungsluft nach der Drosselstelle 14 angeordnet ist. Bei geschlossenem Gasventil 11 kann demnach mit Hilfe des Sensors 16 die Druckdifferenz über die Drosselstelle 14 bestimmt und somit eine Luftmengenmessung durchgeführt werden.The control device shown in FIG. 1 can be used to measure the air volume in the case in which the gas valve 11 is closed. This results from the fact that the sensor 16 with the second measuring point 18 is arranged on the second line 12, namely in the flow direction of the combustion air in front of the throttle point 14; and furthermore the sensor 16 with the first measuring point 17 is arranged on the first line 10, that is to say when the gas valve 11 is closed, via the gas nozzle 15 in the flow direction of the combustion air after the throttle point 14. With the gas valve 11 closed, the pressure difference across the throttle point 14 can therefore be determined with the aid of the sensor 16 and an air quantity measurement can thus be carried out.
Die Luftmengenmessung kann verwendet werden, um den Parameterbereich des Gebläses 13 in Abhängigkeit von einer Konfiguration der Verbrennungsluft-Zufuhr und Rauchgas- Abfuhr einzustellen. Auch dient die Luftmengenmessung der Überwachung und Einstellung einer minimalen Verbrennungsluft-Zufuhr, die zum sicheren Anfahren des Gasbrenners benötigt wird.The air quantity measurement can be used to set the parameter range of the fan 13 depending on a configuration of the combustion air supply and flue gas discharge. The air volume measurement also serves to monitor and set a minimum supply of combustion air, which is required to start the gas burner safely.
Bei der Regeleinrichtung des Ausführungsbeispiels gemäß Figur 2 kann gegenüber dem Ausführungsbeispiel gemäß Figur 1 ein abweichendes Übersetzungsverhältnis zwischen Gasstrom und Luftstrom realisiert werden, also eine 1 :N-Gas/Luft- Verbundregelung. Hierzu ist zwischen der den Gasstrom führenden ersten Leitung 10 und der den Verbrennungsluftstrom führenden zweiten Leitung 12 eine Koppelleitung 23 vorgesehen, wobei innerhalb der Koppelleitung 23 zwei Einschnürungen 24, 25 angeordnet sind. Bei den Einschnürungen 24, 25 handelt es sich um Drosselstellen.In the control device of the exemplary embodiment according to FIG. 2, a different transmission ratio can exist between the exemplary embodiment according to FIG Gas flow and air flow can be realized, i.e. a 1: N gas / air compound control. For this purpose, a coupling line 23 is provided between the first line 10 carrying the gas flow and the second line 12 carrying the combustion air flow, two constrictions 24, 25 being arranged within the coupling line 23. The constrictions 24, 25 are throttling points.
Die Position der Einschnürungen 24, 25 in der Koppelleitung 23 in bezug auf die Leitungen 10, 12 ist von untergeordneter Bedeutung. Der Strömungswiderstand der Leitungen muß jedoch merklich geringer sein als der Strömungswiderstand der Einschnürungen 24, 25.The position of the constrictions 24, 25 in the coupling line 23 with respect to the lines 10, 12 is of minor importance. However, the flow resistance of the lines must be noticeably lower than the flow resistance of the constrictions 24, 25.
Die Koppelleitung 23 ist gemäß Figur 2 an die den Verbrennungsluftstrom führende zweite Leitung 12 in Strömungsrichtung der Verbrennungsluft nach bzw. hinter der Drosselstelle 14 angeschlossen. An die den Gasstrom führende erste Leitung 10 hingegen ist die Koppelleitung 23 in Strömungsrichtung des Gases vor der Gasdüse 15 angeschlossen.According to FIG. 2, the coupling line 23 is connected to the second line 12 carrying the combustion air flow in the flow direction of the combustion air after or behind the throttle point 14. By contrast, the coupling line 23 is connected to the first line 10 carrying the gas flow in the flow direction of the gas in front of the gas nozzle 15.
Beim Ausführungsbeispiel gemäß Figur 2 ist der Sensor 16 - ebenfalls wie beim Ausführungsbeispiel gemäß Figur 1 - zwischen der ersten Leitung 10 und der zweiten Leitung 12 angeordnet. Beim Ausführungsbeispiel gemäß Figur 2 ist jedoch der erste Meßpunkt 17 im Bereich der Koppeleitung 23 zwischen den Einschnürungen 24, 25 angeordnet. Der zweite Meßpunkt 18 ist wiederum im Bereich der zweiten Leitung 12 in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14 angeordnet.In the exemplary embodiment according to FIG. 2, the sensor 16 is arranged between the first line 10 and the second line 12, as in the exemplary embodiment according to FIG. In the exemplary embodiment according to FIG. 2, however, the first measuring point 17 is arranged in the area of the coupling line 23 between the constrictions 24, 25. The second measuring point 18 is again arranged in the area of the second line 12 in the flow direction of the combustion air in front of the throttle point 14.
Auch bei dem Ausführungsbeispiel gemäß Figur 2 erzeugt das Regelgerät 20 ein Regelungssignal 21 für den Stellantrieb 22 des Gasventils 11, derart, daß das Signal 19 des Sensors 16 auf einen Betrag geführt wird, der einer Druckdifferenz von Null entspricht. Durch die Anordnung der Koppelleitung 23 mit den Einrichtungen 21, 25 ist jedoch dadurch eine 1 :N-Gas/Luft- Verbundregelung realisierbar, d.h. daß bei einer Erhöhung des Verbrennungsluftdrucks von 1 mbar der Gasdruck um N mbar erhöht wird.In the exemplary embodiment according to FIG. 2, the control device 20 also generates a control signal 21 for the actuator 22 of the gas valve 11 in such a way that the signal 19 of the sensor 16 is guided to an amount which corresponds to a pressure difference of zero. However, by arranging the coupling line 23 with the devices 21, 25, a 1: N gas / air compound control can be implemented, i.e. that when the combustion air pressure increases by 1 mbar, the gas pressure is increased by N mbar.
Mit der Regeleinrichtung gemäß Figur 2 ist demzufolge eine 1 :N-Gas/Luft- Verbundregelung möglich. Mit anderen Worten kann bei dem Ausführungsbeispiel gemäß Figur 2 der Gasdruck in bezug auf den Verbrennungsluftdruck verstärkt werden. Der Grad der Verstärkung wird durch die Einschnürungen 24, 25 bestimmt.Accordingly, a 1: N gas / air combination control is possible with the control device according to FIG. In other words, in the exemplary embodiment according to FIG. 2, the gas pressure can be increased in relation to the combustion air pressure. The degree of reinforcement is determined by the constrictions 24, 25.
Desweiteren sei darauf hingewiesen, daß eine der Einschnürungen 24, 25 variabel bzw. veränderbar ausgebildet sein kann. In diesem Fall ist es möglich, durch Veränderung bzw. Verstellung einer Einschnürung 24 bzw. 25 das Übersetzungsverhältnis zwischen Verbrennungsluftstrom und Gasstrom bzw. die Verstärkung zu variieren. B ezuεszeichenliste :Furthermore, it should be noted that one of the constrictions 24, 25 can be variable or changeable. In this case it is possible, by changing or adjusting a constriction 24 or 25, to vary the transmission ratio between the combustion air flow and the gas flow or the amplification. List of characters:
10 Leitung10 line
11 Gasventil11 gas valve
12 Leitung12 line
13 Gebläse13 blowers
14 Drosselstelle14 throttling point
15 Gasdüse15 gas nozzle
16 Sensor16 sensor
17 Meßpunkt17 measuring point
18 Meßpunkt18 measuring point
19 Signal19 signal
20 Regelgerät20 control device
21 Regelungssignal21 control signal
22 Stellantrieb22 actuator
23 Koppelleitung23 coupling line
24 Einschnürung24 constriction
25 Einschnürung 25 constriction

Claims

Patentansprüche: Claims:
1. Regeleinrichtung für Gasbrenner zur Bereitstellung eines Gas/Luft-Gemisches, nämlich zum Zuführen eines Gasstroms und eines Verbrennungsluftstroms zu einem Brenner, mit mindestens einem Gasventil (11), wobei der Gasstrom durch das Gasventil (11) in Abhängigkeit vom Verbrennungsluftdruck einstellbar ist, dadurch gekennzeichnet, daß a) zwischen einer den Gasstrom führenden ersten Leitung (10) und einer den Verbrennungsluftstrom führenden zweiten Leitung (12) ein Sensor (16) angeordnet ist, b) der Sensor (16) mit einem ersten Meßpunkt (17) an der den Gasstrom führenden ersten Leitung (10) und mit einem zweiten Meßpunkt (18) an der den Verbrennungsluftstrom führenden zweiten Leitung (12) gekoppelt ist, c) der erste Meßpunkt (17) in Strömungsrichtung des Gases vor einer Gasdüse (15) und der zweite Meßpunkt (18) in Strömungsrichtung der Verbrennungsluft vor einer Drosselstelle (14) angeordnet ist, d) ein vom Sensor (16) erzeugtes elektrisches bzw. elektronisches Signal (19) zur Verstellung des Gasventils (11) verwendet wird.1. Control device for gas burners for providing a gas / air mixture, namely for supplying a gas flow and a combustion air flow to a burner, with at least one gas valve (11), the gas flow through the gas valve (11) being adjustable depending on the combustion air pressure, characterized in that a) a sensor (16) is arranged between a first line (10) carrying the gas flow and a second line (12) carrying the combustion air flow, b) the sensor (16) with a first measuring point (17) on the the gas flow leading first line (10) and a second measuring point (18) on the combustion air flow leading second line (12) is coupled, c) the first measuring point (17) in the flow direction of the gas in front of a gas nozzle (15) and the second Measuring point (18) in the flow direction of the combustion air is arranged in front of a throttle point (14), d) an electrical or electronic signal (19) generated by the sensor (16) ) is used to adjust the gas valve (11).
2. Regeleinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß in Abhängigkeit des vom Sensor (16) erzeugten elektrischen bzw. elektronischen Signals (19) ein2. Control device according to claim 1, characterized in that depending on the generated by the sensor (16) electrical or electronic signal (19)
Regelungssignal (21) für einen dem Gasventils (11) zugeordneten Stellantrieb (22) erzeugt wird.Control signal (21) for an actuator (22) assigned to the gas valve (11) is generated.
3. Regeleinrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Regelungssignal (21) als Sicherungssignal derart verwendet wird, das ein Sicherheitsventil geöffnet ist, solange das Regelungssignal (21) zwischen mindestens zwei Signalzuständen oszilliert.3. Control device according to claim 2, characterized in that the control signal (21) is used as a safety signal such that a safety valve is open as long as the control signal (21) oscillates between at least two signal states.
4. Regeleinrichtung nach einem oder mehreren der Ansprüche 1 bis 3, gekennzeichnet durch eine zwischen der ersten Leitung (10) und der zweiten Leitung (12) verlaufende4. Control device according to one or more of claims 1 to 3, characterized by a between the first line (10) and the second line (12) extending
Koppelleitung (23), wobei innerhalb der Koppelleitung (23) vorzugsweise zwei Einschnürungen (24, 25) angeordnet sind.Coupling line (23), two constrictions (24, 25) preferably being arranged within the coupling line (23).
5. Regeleinrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Koppelleitung (23) an die den Verbrennungsluftstrom führende zweite Leitung (12) in5. Control device according to claim 4, characterized in that the coupling line (23) to the combustion air flow leading second line (12) in
Strömungsrichtung der Verbrennungsluft nach der Drosselstelle (14) angekoppelt ist. Flow direction of the combustion air is coupled after the throttle point (14).
6. Regeleinrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Koppelleitung (23) an die den Gasstrom führende erste Leitung (10) in Strömungsrichtung des Gases vor der Gasdüse (15) angekoppelt ist.6. Control device according to claim 4 or 5, characterized in that the coupling line (23) to the gas line leading first line (10) is coupled in the flow direction of the gas in front of the gas nozzle (15).
7. Regeleinrichtung nach einem oder mehreren der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß der erste Meßpunkt (17) im Bereich der Koppelleitung (23) zwischen der ersten Einschnürung (24) und der zweiten Einschnürung (25) und der zweite Meßpunkt (18) im Bereich der zweiten Leitung (10) in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle (14) angeordnet ist.7. Control device according to one or more of claims 4 to 6, characterized in that the first measuring point (17) in the area of the coupling line (23) between the first constriction (24) and the second constriction (25) and the second measuring point (18th ) is arranged in the area of the second line (10) in the flow direction of the combustion air in front of the throttle point (14).
8. Regeleinrichtung nach einem oder mehreren der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß mindestens eine der Einschnürungen (24, 25) verstellbar bzw. variabel ausgebildet ist.8. Control device according to one or more of claims 4 to 7, characterized in that at least one of the constrictions (24, 25) is adjustable or variable.
9. Regeleinrichtung nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Sensor (16) als Differenzdruck-Sensor, insbesondere als Durchflußmesser, ausgebildet ist.9. Control device according to one or more of claims 1 to 8, characterized in that the sensor (16) is designed as a differential pressure sensor, in particular as a flow meter.
10. Regeleinrichtung nach einem oder mehreren der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß dieselbe zur Luftmengenmessung verwendet wird, wobei die Luftmengenmessung zur Einstellung des Parameterbereichs eines Gebläses (13) in Abhängigkeit von einer Konfiguration der Verbrennungsluft-Zuftihr und Rauchgas- Abfuhr verwendet wird.10. Control device according to one or more of claims 1 to 9, characterized in that the same is used for air volume measurement, the air volume measurement for setting the parameter range of a blower (13) depending on a configuration of the combustion air supply and flue gas discharge is used .
11. Regeleinrichtung nach einem oder mehreren der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Luftmengenmessung zur Überwachung und Einstellung einer minimalen Verbrennungsluft-Zufuhr verwendet wird, die zum sicheren Anfahren des Gasbrenners benötigt wird.11. Control device according to one or more of claims 1 to 10, characterized in that the air volume measurement is used for monitoring and setting a minimum supply of combustion air, which is required for the safe start-up of the gas burner.
12. Verwendung einer Regeleinrichtung nach einem oder mehreren der Ansprüche 1 bis 9 zur Luftmengenmessung. 12. Use of a control device according to one or more of claims 1 to 9 for air volume measurement.
EP99955316A 1998-06-02 1999-05-27 Gas burner regulating system Expired - Lifetime EP1084369B1 (en)

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DE19824521A DE19824521B4 (en) 1998-06-02 1998-06-02 Control device for gas burners
PCT/EP1999/003670 WO1999063272A1 (en) 1998-06-02 1999-05-27 Gas burner regulating system

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CA2321659A1 (en) 1999-12-09
DE59904050D1 (en) 2003-02-20
JP2002517702A (en) 2002-06-18
WO1999063272A1 (en) 1999-12-09
DE19824521B4 (en) 2004-12-23
KR20010071151A (en) 2001-07-28
US6561791B1 (en) 2003-05-13
ES2186419T3 (en) 2003-05-01
EP1084369B1 (en) 2003-01-15
DE19824521A1 (en) 1999-12-09
DK1084369T3 (en) 2003-03-03

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