EP0276399B1 - Suck through installation for gas sensing elements in heating plants - Google Patents

Suck through installation for gas sensing elements in heating plants Download PDF

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Publication number
EP0276399B1
EP0276399B1 EP87117122A EP87117122A EP0276399B1 EP 0276399 B1 EP0276399 B1 EP 0276399B1 EP 87117122 A EP87117122 A EP 87117122A EP 87117122 A EP87117122 A EP 87117122A EP 0276399 B1 EP0276399 B1 EP 0276399B1
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Prior art keywords
gas
sensor
blower
sensors
gas sensor
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EP87117122A
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German (de)
French (fr)
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EP0276399A2 (en
EP0276399A3 (en
Inventor
Maarten Van Dongen
Josef Wüest
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Electrowatt Technology Innovation AG
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Landis and Gyr Betriebs 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

Definitions

  • the invention relates to a suction device for at least one gas sensor in a heating system of the type mentioned in the preamble of claim 1.
  • gas sensors are used in particular for the analysis of combustion gases and their measurement results are used for monitoring and optimizing the combustion process.
  • Gas sensors usually have a measuring room into which the gas to be measured is brought and has its effect on the sensor.
  • sensors in particular oxygen sensors, which are brought into contact with the combustion gas without any suction devices in order to measure the gas properties. Because of the large dwell time of the gas in the measuring room, these can have a long response time despite their own small time constant. They are often designed so that the gas exchange speed in the measuring room increases with increasing speed of the air quantity required for combustion, but then they have a long response time in low-load operation, at which this speed is low.
  • the invention has for its object to provide a suction device for gas sensors in heating systems, which enables an accelerated gas change in the measuring chamber of the sensor, which is not dependent on the air flow through the heating system and in which no additional pump is required.
  • the only drawing figure shows a suction device for a gas sensor on a heating system.
  • a heating system 1 is shown schematically in the drawing. It has a burner 2 at which a fuel line 3 ends, which is advanced to the mouth of a fan 4. This provides the amount of air required for combustion.
  • the heating system 1 is surrounded by walls 5. If the heating system 1 is in operation, ie a flame is burning, combustion gases are formed in it.
  • a gas sensor 6, here an oxygen sensor is attached, which consists, among other things, of a sensor tube 7 and a protective wall 8, which serve as removal points at the front openings 9 for Has entry of the combustion gases into a measuring room 10.
  • the outer sensor side forms a measurement signal from the combustion gases which have entered the measurement space 10 via the openings 9.
  • the innermost space of the gas sensor 6 serves as the reference air measuring space 11, it is freely accessible for the outside air outside the heating system 1.
  • the signal is through the Difference formed in the oxygen concentrations in the combustion gas and in the reference air.
  • Other oxygen sensors or other gas sensors 6 can also be used, they only need to have a measuring space 10 into which the gas can penetrate.
  • the measuring device is only available as far as it has been described so far, and the oxygen content of the combustion gas changes abruptly, the full change in the oxygen content is only displayed by the gas sensor 6 acting as an oxygen sensor when the measuring chamber 10 Diffusion through the openings 9 has set the new oxygen content.
  • the gas sensor therefore has a long response time despite the fact that its own time constant may be small.
  • the gas change time is reduced by the flow of combustion gas into the measuring space 10.
  • the gas change then takes place faster at high flow speeds than at low speeds.
  • the flow rate of the combustion gases is low, the adjustment speed of the oxygen sensor 6 becomes high, so that under some circumstances optimal oxygen control is no longer possible.
  • the gas exchange in the gas sensor 6 is now considerably accelerated by an intake pipe 12 connecting the measuring chamber 10 of the gas sensor 6 to the fan 4 and is independent of the flow rate of the combustion gases. Its response time approaches its natural time constant, the time behavior of the measuring device is thus much faster, the device has better properties for oxygen control.
  • the air speed is essentially determined only by the speed of the fan 4 which remains constant in all load states of the heating system.
  • Air flaps located on the inlet or outlet side of the fan 4 regulate the air flow necessary for combustion, but have little effect on the air speed at the circumference of the fan 4.
  • An introduction of the intake pipe 12 ending more or less perpendicularly to the fan wall at this point takes place after Bernoullisch Law prescribes a negative pressure which is essentially only dependent on the air speed.
  • the suction pipe 12 attached between the gas sensor 6 and a suitable location of a fan 4 working as a radial fan thus enables a practically constant gas exchange in the measuring space 10 of the gas sensor 6 under all load conditions of the heating.
  • gas sensors 6 which are sensitive to gases other than oxygen, for example, in addition to the oxygen sensor, a carbon monoxide sensor and a sulfur dioxide sensor, with intermediate intake pipes 12 in parallel or in series, and connect them with the Connect fan 4.
  • those gas sensors 6 that require a lower operating temperature than the oxygen sensor operated at 700 ° C. or for which flow-inhibiting measures such as filtering the combustion air are necessary are arranged closer to the fan 4.
  • the combustion gases can be cooled accordingly by interposing a suction pipe between a suction point in the heating wall 5 and the measuring space 10 of the gas sensor 6, the suction pipe and the gas sensor 6 expediently outside the heating system be attached.
  • the system can be monitored with a vacuum sensor 14 in the intake pipe 12, which is arranged between the last gas sensor 6 and the fan 4 in the intake pipe 12.
  • a three-way valve 13 is installed, for example, on the intake pipe 12 behind the gas sensor 6. From there, the measuring chamber 10 of the gas sensor 6 is blown from time to time with the compressed air being reversed to the suction direction.
  • the device described makes it possible to determine the content of predetermined gases in the combustion gas in heating systems 1 and to use this measurement variable to optimize the heating system, the gas change time and thus the setting time of the gas sensors 6 used not being dependent on the air throughput in the heating system 1. It thus enables a rapid gas change in the measuring room 10 of the gas sensor 6 even when the heating system is in low-load operation.
  • the control time constant of the system is thus reduced and the quality of the control is increased without additional parts, such as pumps, which are subject to wear and tear Heating system 1 must be installed. It also reduces the cost of heating control.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

Die Erfindung bezieht sich auf eine Durchsaugeinrichtung für mindestens einen Gassensor in einer Heizungsanlage der im Oberbegriff des Anspruchs 1 genannten Gattung.The invention relates to a suction device for at least one gas sensor in a heating system of the type mentioned in the preamble of claim 1.

Eine derartige Einrichtung ist in der Druckschrift EP -A-231 705 gezeigt, die unter Artikel 54 (3 und 4) EPÜ zum Stand der Technik gehört Dabei bestehen verschiedene Möglichkeiten, einen Gassensor so anzuordnen, daß das zu analysierende Gas zwangsläufig am Gassensor vorbeigeführt wird. Der Gassensor liegt dabei im Zuge einer Verbindungsleitung, die mit dem Ventilator der Heizungsanlage in Verbindung stehen kann.Such a device is shown in the document EP-A-231 705, which belongs to the prior art under Article 54 (3 and 4) EPC. There are various possibilities for arranging a gas sensor in such a way that the gas to be analyzed is inevitably guided past the gas sensor . The gas sensor is located in the course of a connecting line that can be connected to the fan of the heating system.

In Heizungsanlagen werden Gassensoren insbesondere zur Analyse von Verbrennungsgasen verwendet und ihre Messergebnisse zur Ueberwachung und Optimierung des Verbrennungsprozesses benutzt. Gassensoren besitzen meist einen Messraum, in den das zu messende Gas gebracht wird und dort seine Wirkung auf den Sensor ausübt.In heating systems, gas sensors are used in particular for the analysis of combustion gases and their measurement results are used for monitoring and optimizing the combustion process. Gas sensors usually have a measuring room into which the gas to be measured is brought and has its effect on the sensor.

Es gibt Sensoren, insbesondere Sauerstoffsensoren, die zur Messung der Gaseigenschaften ohne irgendwelche Durchsaugeinrichtungen mit dem Verbrennungsgas in Kontakt gebracht werden. Diese können wegen der grossen Verweilzeit des Gases im Messraum trotz kleiner eigener Zeitkonstante eine grosse Einstellzeit aufweisen. Sie sind häufig so ausgebildet, dass die Gaswechselgeschwindigkeit im Messraum mit zunehmender Geschwindigkeit der zur Verbrennung notwendigen Luftmenge anwächst, haben aber dann im Kleinlastbetrieb, bei dem diese Geschwindigkeit klein ist, eine grosse Einstellzeit.There are sensors, in particular oxygen sensors, which are brought into contact with the combustion gas without any suction devices in order to measure the gas properties. Because of the large dwell time of the gas in the measuring room, these can have a long response time despite their own small time constant. They are often designed so that the gas exchange speed in the measuring room increases with increasing speed of the air quantity required for combustion, but then they have a long response time in low-load operation, at which this speed is low.

Zur Verkleinerung der Verweilzeit werden solche Sensoren in Verbindung mit Pumpen verwendet, die einen zwangsweisen Gaswechsel im Sensor erzwingen. Die Werksschrift "Lambda-Sonde LS 1" der BBC Brown-Boveri & Cie, D-7160 Frankenthal, zeigt einen solchen Sauerstoffsensor mit einer Pumpe. Der Gaswechsel im Messraum des Sensors ist also nicht mehr vom Luftdurchsatz durch die Heizanlage abhängig. Mit ihm wird somit eine schnellere Anzeige der Veränderung des Verbrennungsgasgemisches ermöglicht. Sie enthält mit der Pumpe einen zusätzlichen und verschleissempfindlichen Bauteil.To reduce the dwell time, such sensors are used in conjunction with pumps that force a gas change in the sensor. The "Lambda-Probe LS 1" works paper from BBC Brown-Boveri & Cie, D-7160 Frankenthal, shows such an oxygen sensor with a pump. The gas change in the sensor's measuring room is therefore no longer dependent on the air flow through the heating system. It enables a faster display of the change in the combustion gas mixture. It contains an additional and wear-sensitive component with the pump.

Der Erfindung liegt die Aufgabe zugrunde, eine Durchsaugeinrichtung für Gassensoren in Heizungsanlagen zu schaffen, die einen beschleunigten Gaswechsel im Messraum des Sensors ermöglicht, der nicht vom Luftdurchsatz durch die Heizanlage abhängig ist und bei der keine zusätzliche Pumpe erforderlich ist.The invention has for its object to provide a suction device for gas sensors in heating systems, which enables an accelerated gas change in the measuring chamber of the sensor, which is not dependent on the air flow through the heating system and in which no additional pump is required.

Diese Aufgabe wird durch die Merkmale des Kennzeichenteils des Patentanspruchs 1 gelöst, die übrigen Ansprüche betreffen vorteilhafte Ausführungsformen.This object is achieved by the features of the characterizing part of patent claim 1, the remaining claims relate to advantageous embodiments.

Die Erfindung wird beispielhaft an Hand der Zeichnung erläutert.The invention is explained by way of example with reference to the drawing.

Die einzige Zeichnungsfigur zeigt eine Durchsaugeinrichtung für einen Gassensor an einer Heizungsanlage.The only drawing figure shows a suction device for a gas sensor on a heating system.

Eine Heizungsanlage 1 ist in der Zeichnung schematisch dargestellt. Sie weist einen Brenner 2 auf, an dem eine Brennstoffleitung 3 endet, die bis an die Mündung eines Ventilators 4 vorgezogen ist. Dieser liefert die zur Verbrennung notwendige Luftmenge. Die Heizungsanlage 1 ist von Wänden 5 umgeben. Ist die Heizungsanlage 1 in Betrieb, brennt also eine Flamme, so bilden sich in ihr Verbrennungsgase. An einer geeigneten Stelle, wie sie in der Literatur über den Aufbau von Heizungsanlagen beschrieben ist, ist ein Gassensor 6, hier ein Sauerstoffsensor, angebracht, der unter anderem aus einem Sensorrohr 7 und einer Schutzwand 8 besteht, die vorne als Entnahmestellen dienende Oeffnungen 9 zum Eintritt der Verbrennungsgase in einen Messraum 10 besitzt. Die äussere Sensorseite bildet aus den über die Oeffnungen 9 in den Messraum 10 eingedrungenen Verbrennungsgasen ein Messignal. Der innerste Raum des Gassensors 6 dient als Referenzluftmessraum 11, er ist für die Aussenluft ausserhalb der Heizanlage 1 frei zugänglich. Das Signal wird durch den Unterschied in den Sauerstoffkonzentrationen im Verbrennungsgas und in der Referenzluft gebildet. Es können auch andere Sauerstoffsensoren oder andere Gassensoren 6 benutzt werden, sie müssen nur einen Messraum 10 haben, in den das Gas eindringen kann.A heating system 1 is shown schematically in the drawing. It has a burner 2 at which a fuel line 3 ends, which is advanced to the mouth of a fan 4. This provides the amount of air required for combustion. The heating system 1 is surrounded by walls 5. If the heating system 1 is in operation, ie a flame is burning, combustion gases are formed in it. At a suitable point, as described in the literature on the construction of heating systems, a gas sensor 6, here an oxygen sensor, is attached, which consists, among other things, of a sensor tube 7 and a protective wall 8, which serve as removal points at the front openings 9 for Has entry of the combustion gases into a measuring room 10. The outer sensor side forms a measurement signal from the combustion gases which have entered the measurement space 10 via the openings 9. The innermost space of the gas sensor 6 serves as the reference air measuring space 11, it is freely accessible for the outside air outside the heating system 1. The signal is through the Difference formed in the oxygen concentrations in the combustion gas and in the reference air. Other oxygen sensors or other gas sensors 6 can also be used, they only need to have a measuring space 10 into which the gas can penetrate.

Ist die Messeinrichtung nur so weit, wie sie bisher beschrieben wurde, vorhanden, und ändert sich der Gehalt des Verbrennungsgases an Sauerstoff sprunghaft, so wird die volle Aenderung des Sauerstoffgehaltes von dem als Sauerstoffsensor wirkenden Gassensor 6 erst dann angezeigt, wenn sich im Messraum 10 durch Diffusion durch die Oeffnungen 9 der neue Sauerstoffgehalt eingestellt hat. Der Gassensor hat somit trotz eventuell kleiner eigener Zeitkonstante eine grosse Einstellzeit.If the measuring device is only available as far as it has been described so far, and the oxygen content of the combustion gas changes abruptly, the full change in the oxygen content is only displayed by the gas sensor 6 acting as an oxygen sensor when the measuring chamber 10 Diffusion through the openings 9 has set the new oxygen content. The gas sensor therefore has a long response time despite the fact that its own time constant may be small.

Durch geeignete Formgebung der Oeffnungen 9 wird die Gaswechselzeit durch Einströmen von Verbrennungsgas in den Messraum 10 verkleinert. Der Gaswechsel erfolgt dann bei hohen Strömungsgeschwindigkeiten schneller als bei niederen Geschwindigkeiten. Beim Fahren im Kleinlastbetrieb ist jedoch die Strömungsgeschwindigkeit der Verbrennungsgase klein, die Einstellgeschwindigkeit des Sauerstoffsensors 6 wird gross, so dass unter Umständen keine optimale Sauerstoffregelung mehr möglich ist.By suitable shaping of the openings 9, the gas change time is reduced by the flow of combustion gas into the measuring space 10. The gas change then takes place faster at high flow speeds than at low speeds. When driving in low-load operation, however, the flow rate of the combustion gases is low, the adjustment speed of the oxygen sensor 6 becomes high, so that under some circumstances optimal oxygen control is no longer possible.

Durch ein den Messraum 10 des Gassensors 6 mit dem Ventilator 4 verbindendes Ansaugsohr 12 wird nun der Gaswechsel im Gassensor 6 erheblich beschleunigt und von der Strömungsgeschwindigkeit der Verbrennungsgase unabhängig. Seine Einstellzeit nähert sich seiner Eigenzeitkonstante, das Zeitverhalten der Messeinrichtung wird somit wesentlich schneller, die Einrichtung hat bessere Eigenschaften zur Sauerstoffregelung.The gas exchange in the gas sensor 6 is now considerably accelerated by an intake pipe 12 connecting the measuring chamber 10 of the gas sensor 6 to the fan 4 and is independent of the flow rate of the combustion gases. Its response time approaches its natural time constant, the time behavior of the measuring device is thus much faster, the device has better properties for oxygen control.

Dabei ist es besonders vorteilhaft, am Ventilator 4 für den Anschluss des Ansaugrohrs 12 eine Stelle zu finden, an der bei jedem Lastzustand der Heizungsanlage im Ansaugrohr ein möglichst gleichbleibender, aber geringerer Druck auftritt, als dem Druck in der Umgebung der Entnahmestelle des Verbrennungsgases für den Messraum 10 entspricht. Der Messraum 10 wird durch das Ansaugrohr 12 zwangsentlüftet, es stellt sich im Betrieb eine weitgehend gleichbleibende Einstellzeit des Gassensors 6 ein. Beispielsweise lässt sich bei einem als Radiallüfter arbeitenden Ventilator 4, der stets mit der gleichen Drehzahl betrieben und bei dem die transportierte Luftmenge durch eingangs oder ausgangsseitige Klappen 15 geregelt wird, eine solche Stelle stets am äussersten Radius der Ventilatorwand finden. Dort wird die Luftgeschwindigkeit im wesentlichen nur durch die bei allen Lastzuständen der Heizungsanlage gleichbleibende Drehzahl des Ventilators 4 bestimmt. Eingangsseitig oder ausgangsseitig am Ventilator 4 befindliche Luftklappen regeln zwar den zur Verbrennung notwendigen Luftstrom, haben aber nur wenig Einwirkung auf die Luftgeschwindigkeit am Umfang des Ventilators 4. Eine mehr oder weniger senkrecht zur Ventilatorwand an dieser Stelle endende Einführung des Ansaugrohrs 12 findet dort nach dem Bernoullischen Gesetz einen im wesentlichen nur von der Luftgeschwindigkeit abhängigen Unterdruck vor. Das zwischen dem Gassensor 6 und einer geeigneten Stelle eines als Radiallüfter arbeitenden Ventilatiors 4 angebrachte Ansaugrohr 12 ermöglicht somit einen praktisch gleichbleibenden Gaswechsel im Messraum 10 des Gassensors 6 bei allen Lastzuständen der Heizung.It is particularly advantageous to find a point on the fan 4 for the connection of the intake pipe 12 at which a pressure which is as constant as possible but lower than the pressure in the vicinity of the extraction point of the combustion gas occurs in the intake pipe for each load condition of the heating system Measuring room 10 corresponds. The measuring chamber 10 is forced vented through the intake pipe 12, and a largely constant response time of the gas sensor 6 is established during operation. For example, in the case of a fan 4 working as a radial fan, which is always operated at the same speed and in which the amount of air transported is regulated by flaps 15 on the inlet or outlet side, such a location can always be found at the outermost radius of the fan wall. There, the air speed is essentially determined only by the speed of the fan 4 which remains constant in all load states of the heating system. Air flaps located on the inlet or outlet side of the fan 4 regulate the air flow necessary for combustion, but have little effect on the air speed at the circumference of the fan 4. An introduction of the intake pipe 12 ending more or less perpendicularly to the fan wall at this point takes place after Bernoullisch Law prescribes a negative pressure which is essentially only dependent on the air speed. The suction pipe 12 attached between the gas sensor 6 and a suitable location of a fan 4 working as a radial fan thus enables a practically constant gas exchange in the measuring space 10 of the gas sensor 6 under all load conditions of the heating.

Es ist auch möglich, mehrere Gassensoren 6, die für andere Gase als Sauerstoff empfindlich sind, also beispielsweise neben dem Sauerstoffsensor noch einen Kohlenmonoxydsensor und einen Schwefeldioxydsensor, mit zwischengeschalteten Ansaugrohren 12 parallel- oder hintereinanderzuschalten und sie mit dem Ventilator 4 zu verbinden. Zweckmässigerweise werden diejenigen Gassensoren 6, die eine niedrigere Betriebstemperatur benötigen als der bei 700°C betriebene Sauerstoffsensor oder bei denen strömungshemmende Massnahmen wie Filtern der Verbrennungsluft notwendig sind, näher beim Ventilator 4 angeordnet.It is also possible to connect a plurality of gas sensors 6, which are sensitive to gases other than oxygen, for example, in addition to the oxygen sensor, a carbon monoxide sensor and a sulfur dioxide sensor, with intermediate intake pipes 12 in parallel or in series, and connect them with the Connect fan 4. Advantageously, those gas sensors 6 that require a lower operating temperature than the oxygen sensor operated at 700 ° C. or for which flow-inhibiting measures such as filtering the combustion air are necessary are arranged closer to the fan 4.

Ist die Temperatur der Verbrennungsgase höher als die Betriebstemperatur des Gassensors 6, so lassen sich durch Zwischenschalten eines Saugrohres zwischen einer Ansaugstelle in der Heizungswand 5 und dem Messraum 10 des Gassensors 6 die Verbrennungsgase entsprechend abkühlen, wobei das Saugrohr und der Gassensor 6 zweckmässigerweise ausserhalb der Heizanlage angebracht werden.If the temperature of the combustion gases is higher than the operating temperature of the gas sensor 6, the combustion gases can be cooled accordingly by interposing a suction pipe between a suction point in the heating wall 5 and the measuring space 10 of the gas sensor 6, the suction pipe and the gas sensor 6 expediently outside the heating system be attached.

Die Anlage kann mit einem Unterdruckfühler 14 im Ansaugrohr 12 überwacht werden, der zwischen dem letzten Gassensor 6 und dem Ventilator 4 im Ansaugrohr 12 angeordnet ist.The system can be monitored with a vacuum sensor 14 in the intake pipe 12, which is arranged between the last gas sensor 6 and the fan 4 in the intake pipe 12.

Um die Einrichtung zu reinigen, wird beispielsweise an das Ansaugrohr 12 hinter dem Gassensor 6 ein Dreiwegeventil 13 eingebaut. Von Zeit zu Zeit wird von dort her der Messraum 10 des Gassensors 6 umgekehrt zu der Ansaugrichtung mit gereinigter Pressluft durchgeblasen.In order to clean the device, a three-way valve 13 is installed, for example, on the intake pipe 12 behind the gas sensor 6. From there, the measuring chamber 10 of the gas sensor 6 is blown from time to time with the compressed air being reversed to the suction direction.

Die beschriebene Einrichtung ermöglicht es, in Heizungsanlagen 1 den Gehalt an vorbestimmten Gasen im Verbrennungsgas zu bestimmten und diese Messgrösse zur Optimierung der Heizungsanlage zu verwenden, wobei die Gaswechselzeit und damit die Einstellzeit der verwendeten Gassensoren 6 nicht vom Luftdurchsatz in der Heizungsanlage 1 abhängig sind. Sie ermöglicht somit auch bei Kleinlastbetrieb der Heizanlage einen schnellen Gaswechsel im Messraum 10 des Gassensors 6. Damit wird die Regelzeitkonstante der Anlage verkleinert und somit die Güte der Regelung erhöht, ohne dass dazu verschleissanfällige zusätzliche Teile wie Pumpen in die Heizungsanlage 1 eingebaut werden müssen. Ausserdem werden die Kosten für die Heizungsregelkung verringert.The device described makes it possible to determine the content of predetermined gases in the combustion gas in heating systems 1 and to use this measurement variable to optimize the heating system, the gas change time and thus the setting time of the gas sensors 6 used not being dependent on the air throughput in the heating system 1. It thus enables a rapid gas change in the measuring room 10 of the gas sensor 6 even when the heating system is in low-load operation. The control time constant of the system is thus reduced and the quality of the control is increased without additional parts, such as pumps, which are subject to wear and tear Heating system 1 must be installed. It also reduces the cost of heating control.

Claims (9)

  1. A through-suction device for at least one gas sensor in a heating installation in which the gas sensor has a measuring chamber in to which the combustion gas to be measured penetrates, a forced gas exchange effect occurs in the measuring chamber and the heating installation has a blower for supplying the amount of air required for combustion, characterised in that the measuring chamber (10) is connected to the blower (4) through at least one intake tube (12), wherein the end of the intake tube (12) which is remote from the measuring chamber (10) is connected to a bore in the blower wall at the outermost radius of the blower (4) which always rotates at the same speed of rotation and which is in the form of a radial fan.
  2. A device according to claim 1 characterised in that the or one of the gas sensors (6) is an oxygen sensor.
  3. A device according to claim 1 characterised in that all or a part of the gas sensors (6) are sensitive in relation to gases other than oxygen.
  4. A device according to at least one of the preceding claims wherein the temperature of the combustion gas is equal to or higher than the operating temperature of the gas sensor (6), characterised in that the gas sensor (6) is disposed outside the heating installation (1) and its measuring chamber (10) is connected with a suction tube to the heating installation, for sampling combustion gas.
  5. A device according to at least one of the preceding claims characterised in that there are means for cleaning the gas sensor or sensors (6).
  6. A device according to at least one of the preceding claims characterised in that a plurality of gas sensors (6) are connected in parallel or series by intake tubes (12) and are connected to the blower (4).
  7. A device according to at least one of the preceding claims characterised in that it is monitored by a reduced pressure sensor (14) disposed in the intake tube (12) behind the last gas sensor (6).
  8. A device according to at least one of the preceding claims characterised in that the gas sensors (6) are arranged closer to the blower (4), according to their decreasing operating temperatures.
  9. A device according to at least one of the preceding claims characterised in that gas sensors (6), in front of which means such as filters for impeding suction intake must be disposed, are arranged closer to the blower (4).
EP87117122A 1987-01-28 1987-11-20 Suck through installation for gas sensing elements in heating plants Expired - Lifetime EP0276399B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH29687 1987-01-28
CH296/87 1987-01-28

Publications (3)

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EP0276399A2 EP0276399A2 (en) 1988-08-03
EP0276399A3 EP0276399A3 (en) 1989-07-26
EP0276399B1 true EP0276399B1 (en) 1992-05-13

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EP87117122A Expired - Lifetime EP0276399B1 (en) 1987-01-28 1987-11-20 Suck through installation for gas sensing elements in heating plants

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EP (1) EP0276399B1 (en)
DE (2) DE3705334A1 (en)

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Publication number Priority date Publication date Assignee Title
DE4315969A1 (en) * 1993-05-10 1995-02-23 Mannesmann Ag Method and equipment for optimising combustion plants

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231705A1 (en) * 1985-12-31 1987-08-12 Societe D'etude Et De Construction De Chaudieres Automatiques En Acier Seccacier Monitoring device for boiler functions

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Publication number Priority date Publication date Assignee Title
DE1809099A1 (en) * 1968-11-15 1970-07-30 Siemens Ag Device for flame monitoring
DE2510717B2 (en) * 1975-03-12 1979-06-28 Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim Device for burners to regulate the fuel-air ratio
DE8202375U1 (en) * 1982-01-30 1983-10-06 H. Saacke Kg, 2800 Bremen FUEL PRESSURE REGULATOR FOR A COMBUSTION SYSTEM

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231705A1 (en) * 1985-12-31 1987-08-12 Societe D'etude Et De Construction De Chaudieres Automatiques En Acier Seccacier Monitoring device for boiler functions

Also Published As

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DE3779095D1 (en) 1992-06-17
EP0276399A2 (en) 1988-08-03
EP0276399A3 (en) 1989-07-26
DE3705334A1 (en) 1988-08-11

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