EP0276399A2 - Installation à aspiration pour détecteurs à gaz dans des installations de chauffage - Google Patents

Installation à aspiration pour détecteurs à gaz dans des installations de chauffage Download PDF

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Publication number
EP0276399A2
EP0276399A2 EP87117122A EP87117122A EP0276399A2 EP 0276399 A2 EP0276399 A2 EP 0276399A2 EP 87117122 A EP87117122 A EP 87117122A EP 87117122 A EP87117122 A EP 87117122A EP 0276399 A2 EP0276399 A2 EP 0276399A2
Authority
EP
European Patent Office
Prior art keywords
gas
fan
sensor
combustion
heating system
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
EP87117122A
Other languages
German (de)
English (en)
Other versions
EP0276399A3 (en
EP0276399B1 (fr
Inventor
Maarten Van Dongen
Josef Wüest
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 AG
Landis and Gyr Betriebs AG
LGZ Landis and Gyr Zug 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 AG, Landis and Gyr Betriebs AG, LGZ Landis and Gyr Zug AG filed Critical Landis and Gyr AG
Publication of EP0276399A2 publication Critical patent/EP0276399A2/fr
Publication of EP0276399A3 publication Critical patent/EP0276399A3/de
Application granted granted Critical
Publication of EP0276399B1 publication Critical patent/EP0276399B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • 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 according to 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.
  • D-7160 Frankenthal shows such an oxygen sensor with a pump.
  • the gas change in the measuring room of the sensor 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.
  • 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 extraction 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 own 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 in the opposite direction to the suction direction with cleaned compressed air.
  • 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.

Landscapes

  • 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)
EP87117122A 1987-01-28 1987-11-20 Installation à aspiration pour détecteurs à gaz dans des installations de chauffage Expired - Lifetime EP0276399B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=4183758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117122A Expired - Lifetime EP0276399B1 (fr) 1987-01-28 1987-11-20 Installation à aspiration pour détecteurs à gaz dans des installations de chauffage

Country Status (2)

Country Link
EP (1) EP0276399B1 (fr)
DE (2) DE3705334A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315969A1 (de) * 1993-05-10 1995-02-23 Mannesmann Ag Verfahren und Einrichtung zur Optimierung von Verbrennungsanlagen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1809099A1 (de) * 1968-11-15 1970-07-30 Siemens Ag Einrichtung zur Flammenueberwachung
DE2510717B2 (de) * 1975-03-12 1979-06-28 Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim Vorrichtung für Brenner zum Regem des Brennstoff-Luft-Mengenverhältnisses
DE8202375U1 (de) * 1982-01-30 1983-10-06 H. Saacke Kg, 2800 Bremen Brennstoffdruckregler fuer eine feuerungsanlage
EP0231705A1 (fr) * 1985-12-31 1987-08-12 Societe D'etude Et De Construction De Chaudieres Automatiques En Acier Seccacier Installation de surveillance du fonctionnement d'une chaudière

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1809099A1 (de) * 1968-11-15 1970-07-30 Siemens Ag Einrichtung zur Flammenueberwachung
DE2510717B2 (de) * 1975-03-12 1979-06-28 Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim Vorrichtung für Brenner zum Regem des Brennstoff-Luft-Mengenverhältnisses
DE8202375U1 (de) * 1982-01-30 1983-10-06 H. Saacke Kg, 2800 Bremen Brennstoffdruckregler fuer eine feuerungsanlage
EP0231705A1 (fr) * 1985-12-31 1987-08-12 Societe D'etude Et De Construction De Chaudieres Automatiques En Acier Seccacier Installation de surveillance du fonctionnement d'une chaudière

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315969A1 (de) * 1993-05-10 1995-02-23 Mannesmann Ag Verfahren und Einrichtung zur Optimierung von Verbrennungsanlagen

Also Published As

Publication number Publication date
DE3779095D1 (de) 1992-06-17
EP0276399A3 (en) 1989-07-26
DE3705334A1 (de) 1988-08-11
EP0276399B1 (fr) 1992-05-13

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