EP0160884A2 - Dispositif de réglage du rapport air-carburant d'une source de chaleur - Google Patents

Dispositif de réglage du rapport air-carburant d'une source de chaleur Download PDF

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Publication number
EP0160884A2
EP0160884A2 EP85104923A EP85104923A EP0160884A2 EP 0160884 A2 EP0160884 A2 EP 0160884A2 EP 85104923 A EP85104923 A EP 85104923A EP 85104923 A EP85104923 A EP 85104923A EP 0160884 A2 EP0160884 A2 EP 0160884A2
Authority
EP
European Patent Office
Prior art keywords
temperature
control device
dew point
air
controller
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
EP85104923A
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German (de)
English (en)
Other versions
EP0160884A3 (en
EP0160884B1 (fr
Inventor
Joachim Plate
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.)
Vaillant BV
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
SCHONEWELLE 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6766538&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0160884(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, SCHONEWELLE BV filed Critical Vaillant Austria GmbH
Priority to AT85104923T priority Critical patent/ATE56084T1/de
Publication of EP0160884A2 publication Critical patent/EP0160884A2/fr
Publication of EP0160884A3 publication Critical patent/EP0160884A3/de
Application granted granted Critical
Publication of EP0160884B1 publication Critical patent/EP0160884B1/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
    • 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
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/10—Measuring temperature stack temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/26—Measuring humidity

Definitions

  • the present invention relates to a control device according to the preamble of the main claim.
  • control devices have become known and use either the residual concentration of oxygen in the exhaust gas or the C0 2 content of this exhaust gas as the measured variable. Due to the fact that a continuous working quantitative gas analysis of any kind has to be carried out, the mentioned control devices require a high level of measurement technology. These high costs of oxygen or carbon dioxide analysis have so far only justified the use of these measuring and control methods in industrial large furnace construction.
  • the present invention aims to establish a ratio control for the air-fuel ratio Small heat source in the range between 5 and 30 kW. With such a small heat source, the price for the control device must not exceed a certain small percentage in relation to the total device price, since otherwise the control device will not be accepted by the operator of the heat source.
  • the invention is based on the knowledge that there is a connection between the air ratio and the dew point temperature in the exhaust gas.
  • the temperature in the exhaust gas can now be lowered by changing the air ratio until the dew point temperature is just not undercut.
  • the solution according to the invention thus consists in the characterizing features of the main claim.
  • a boiler 3 is installed within a room 1, which is delimited by walls 2 of a building.
  • This boiler can be a cast iron boiler as well as a welded steel boiler which is heated by a burner 4.
  • This burner can be an oil or gas burner, and the gas burner can also be designed as a fan burner or as an atmospheric gas burner.
  • the boiler is connected to the atmosphere 6 via an exhaust pipe 5, the temperature of which is exposed to an outside temperature sensor 7, which is connected to a controller 9 via a measuring line 8.
  • a dew point temperature sensor 11 is connected to the controller via a line 10 as a further actual value transmitter, which is arranged in the exhaust pipe 5 downstream of the actual boiler heat exchanger.
  • the boiler is connected via a flow line 12 and a return line 13 to a 4-way mixing valve 14, of which one heating circuit flow line 15 and one Go off heating circuit return line 16, which in turn are connected to each other via a plurality of radiators of a heating system with the interposition of a pump.
  • the temperature of the radiator supply line 15 is sensed by a temperature sensor 17 which is connected to the controller 9 via a measuring line 18.
  • An actuator of the mixer 14 is connected to the controller 9 via an actuating line 19.
  • a continuously adjustable gas valve 21 is connected to the controller 9 via a further line 20, which is arranged in the course of a gas supply line 22 and feeds the burner with gas.
  • This continuously adjustable gas valve can be a known, pneumatically working, continuously adjustable gas valve of a known type.
  • an adjustable oil feed pump or a continuously variable solenoid valve is provided instead of the gas valve 21.
  • the burner is designed as a forced draft burner, and the air access to the burner can be adjusted via a throttle orifice 23, which has a servomotor, not shown, which is acted upon by the controller 9 via a control line 24.
  • the controller 9 is given a specific reference variable as a load, which, in the case of a known gas type, can only be achieved with a certain gas throughput in the time unit.
  • the gas valve 21 is preset on this gas throughput.
  • the burner 4 is ignited, and a certain position of the throttle orifice 23 results via the line 24, which leads to a specific, appropriate air throughput.
  • the hot exhaust gases from the burner act on the boiler heat exchanger inside the boiler 3 and reach the exhaust pipe 5 as cooled exhaust gas.
  • the dew point temperature sensor 11 is acted on, which switches a specific temperature measurement signal to the controller 9 as an actual value on its line 10. If the temperature in the exhaust pipe is below the dew point, this means that the excess air is too small.
  • a command to increase the air throughput by varying the position of the throttle orifice 23 results via the controller 9.
  • This actuating movement is continued until there is no longer a drop below the dew point.
  • the reg ler 9 to achieve the optimal air ratio by reducing the air throughput, which is about 1.1 to 1.2 in a forced draft burner. This value is reached when the dew point temperature is not being reached.
  • the controller is adjusted so that it tries to lower the temperature of the exhaust gases in the exhaust pipe 5 by increasing the admixture of air so that a wet precipitation does not occur due to the temperature falling below the dew point.
  • This mode of operation of the fuel-air ratio control is independent of the load on the boiler, i.e.
  • FIG. three shows the application of the ratio control according to the invention to a circulating water heater.
  • This circulating water heater 30 is connected via the flow line 12 to the radiators 34, which in turn are connected to the return line 13 via a pump 35.
  • the heat exchanger 36 is integrated in the housing of the circulating water heater. Instead of a circulation water heater, it could just as well be a pure water heater or a storage tank. It is essential that an atmospheric burner 4 is used here, which is fed via the gas line 22 via a gas valve 21, which is connected to the controller 9 via a servomotor 37.
  • the gas valve 21 can be continuously adjusted proportionally via the servomotor 37.
  • the controller 9 is connected to the dew point temperature sensor 11 via line 10, likewise via line 8 to the outside temperature sensor 7.
  • the burner 4 is designed as a premix burner, the circulating water heater 30 is connected to a secondary air supply opening 38, which is used as a cylindrical channel is formed and can be more or less closed with a flap 32.
  • the flap is connected to a servomotor 31 via a shaft 33, which is acted upon by the regulator 9 via the line 24.
  • This control device works analogously to that according to FIG. 1, starting from the outside temperature or another variable which specifies the load, a certain gas throughput is predetermined by the burner 4.
  • This gas throughput includes a certain amount of air supply in the time unit, which can be adjusted by adjusting the secondary air inlet opening 38 to a greater or lesser extent.
  • the secondary air supply and also the primary air supply are thus adjusted by adjusting the shaft 33 via the servomotor 31.
  • the exhaust gas generated by the burner 4 is cooled in the heat exchanger 36 and then reaches the exhaust pipe 5.
  • the sensor 11 detects whether the dew point temperature. is exceeded or not reached. If the dew point temperature is undershot, the air throughput is increased until the dew point temperature is exceeded, and if the dew point temperature is exceeded, the air supply is reduced until the dew point temperature has just been reached.
  • This actual value transmitter 11 is a double one Peltier element, one part 40 of which is integrated in the actual sensor element 41, while the other sensor element 42 is arranged at a distance outside the exhaust pipe 5. Both Peltier elements are connected to each other via a line 43 and 44, a direct voltage source 45 being arranged in line 44. This can consist of a battery or a power supply.
  • the DC voltage can also be supplied by an electronic part 46 which is connected to the two connections of line 44 by two output lines 47 and 48. The electronic part 46 can periodically switch the direct voltage that is applied to the lines 47 and 48.
  • Resistance tracks 49 are applied to the surface of the sensor 41, which change their resistance as well as moisture is deposited on the surface.
  • the Peltier elements consist of combinations of metal elements which, when a DC voltage is applied to them, assume different temperature levels. If the polarity of the DC voltage is reversed, the contact points of the Peltier elements exchange their temperatures. If you now bring the cold side of a Peltier element into an exhaust gas mixture from a fuel-heated heat source, water will fail as condensate when the dew point temperature of the water vapor is reached, if the dew point temperature is undercut. The presence of precipitated water as condensate can then be determined by measuring the resistance of the individual resistance elements 49. For this purpose, the resistors are connected to the electronics part 46 via lines 50. The conductive condensed water results in a large decrease in the resistance value in the area of the resistors.
  • the NTC sensor or thermocouple can be used to measure the surface temperature of the sensor.
  • a temperature sensor 51 is provided, which is connected to the controller 9 via the line 10.
  • the direct voltage on lines 47 and 48 is reversed. This heats up the cold measuring point of the Peltier element and the condensate evaporates.
  • the polarity is reversed again, and the dew point temperature at the measuring point in the exhaust pipe is again undershot.
  • the temperature is measured again via the temperature sensor 51 and passed on to the controller 9.
  • the time sequence of the measurement depends on the thermal inertia of the measuring cell and the thermal force of the Peltier element.
  • a suitable construction of the sensor 41 would also enable a continuous measurement of the dew point temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP85104923A 1984-05-03 1985-04-23 Dispositif de réglage du rapport air-carburant d'une source de chaleur Expired - Lifetime EP0160884B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85104923T ATE56084T1 (de) 1984-05-03 1985-04-23 Regeleinrichtung fuer das brennstoffluftverh|ltnis einer waermequelle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8413677U 1984-05-03
DE8413677 1984-05-03

Publications (3)

Publication Number Publication Date
EP0160884A2 true EP0160884A2 (fr) 1985-11-13
EP0160884A3 EP0160884A3 (en) 1986-05-21
EP0160884B1 EP0160884B1 (fr) 1990-08-29

Family

ID=6766538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104923A Expired - Lifetime EP0160884B1 (fr) 1984-05-03 1985-04-23 Dispositif de réglage du rapport air-carburant d'une source de chaleur

Country Status (3)

Country Link
EP (1) EP0160884B1 (fr)
AT (1) ATE56084T1 (fr)
DE (1) DE3579357D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171223B (en) * 1985-02-15 1989-03-01 Sharp Kk A humidity sensor and a heating apparatus including a humidity sensor
EP0317731A1 (fr) * 1987-10-24 1989-05-31 Kurt-Henry Dipl.-Ing. Mindermann Procédé de contrôle de la combustion de carburant possédant un pouvoir calorifique fortement variable
WO1996005506A1 (fr) * 1994-08-16 1996-02-22 Industrial Research Limited Detecteur de point de rosee
EP0793064A3 (fr) * 1996-03-01 1998-09-02 Robert Bosch Gmbh Appareil de chauffage et méthode pour régler un appareil de chauffage
US6247416B1 (en) * 1998-04-02 2001-06-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of operating a furnace and device for implementing the method
EP1630476A2 (fr) 2004-08-24 2006-03-01 Vaillant GmbH Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage
CN102138051A (zh) * 2008-08-29 2011-07-27 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
CN112964747A (zh) * 2021-03-10 2021-06-15 北京科技大学 一种气体冷凝可视化及换热特性检测装置和方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929216C (de) * 1953-03-07 1955-06-23 Siemens Ag Anordnung zur Feuchtemessung von einen elektrisch leitenden Tauniederschlag bildenden Gasen
US4033712A (en) * 1976-02-26 1977-07-05 Edmund D. Hollon Fuel supply systems
US4227411A (en) * 1979-09-24 1980-10-14 Rca Corporation Relative humidity measurement
DE3221660A1 (de) * 1981-06-11 1983-01-05 Paul G. Dipl.-Ing. Dr.techn. 8010 Graz Gilli Verfahren zum zwecke der optimalen verbrennung bei feuerungen
DE3130532A1 (de) * 1981-08-01 1983-02-10 Klaus 1000 Berlin Kummer Vorrichtung fuer die kontrolle der wirtschaftlichen arbeitsweise von feuerungsanlagen
US4492560A (en) * 1983-11-14 1985-01-08 Hardy Sundberg Gas combustion control apparatus
EP0147632A1 (fr) * 1983-12-24 1985-07-10 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Procédé pour le fonctionnement d'un brûleur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929216C (de) * 1953-03-07 1955-06-23 Siemens Ag Anordnung zur Feuchtemessung von einen elektrisch leitenden Tauniederschlag bildenden Gasen
US4033712A (en) * 1976-02-26 1977-07-05 Edmund D. Hollon Fuel supply systems
US4227411A (en) * 1979-09-24 1980-10-14 Rca Corporation Relative humidity measurement
DE3221660A1 (de) * 1981-06-11 1983-01-05 Paul G. Dipl.-Ing. Dr.techn. 8010 Graz Gilli Verfahren zum zwecke der optimalen verbrennung bei feuerungen
DE3130532A1 (de) * 1981-08-01 1983-02-10 Klaus 1000 Berlin Kummer Vorrichtung fuer die kontrolle der wirtschaftlichen arbeitsweise von feuerungsanlagen
US4492560A (en) * 1983-11-14 1985-01-08 Hardy Sundberg Gas combustion control apparatus
EP0147632A1 (fr) * 1983-12-24 1985-07-10 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Procédé pour le fonctionnement d'un brûleur

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171223B (en) * 1985-02-15 1989-03-01 Sharp Kk A humidity sensor and a heating apparatus including a humidity sensor
EP0317731A1 (fr) * 1987-10-24 1989-05-31 Kurt-Henry Dipl.-Ing. Mindermann Procédé de contrôle de la combustion de carburant possédant un pouvoir calorifique fortement variable
US4895082A (en) * 1987-10-24 1990-01-23 Mindermann Kurt Henry Technique for controlling the combustion of fuel having fluctuating thermal values
US4984524A (en) * 1987-10-24 1991-01-15 Mindermann Kurt Henry Technique for controlling the combustion of fuel having fluctuating thermal values
WO1996005506A1 (fr) * 1994-08-16 1996-02-22 Industrial Research Limited Detecteur de point de rosee
EP0793064A3 (fr) * 1996-03-01 1998-09-02 Robert Bosch Gmbh Appareil de chauffage et méthode pour régler un appareil de chauffage
US6247416B1 (en) * 1998-04-02 2001-06-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of operating a furnace and device for implementing the method
EP1630476A2 (fr) 2004-08-24 2006-03-01 Vaillant GmbH Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage
EP1630476A3 (fr) * 2004-08-24 2008-05-28 Vaillant GmbH Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage
CN102138051A (zh) * 2008-08-29 2011-07-27 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
CN102138051B (zh) * 2008-08-29 2013-11-06 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
CN112964747A (zh) * 2021-03-10 2021-06-15 北京科技大学 一种气体冷凝可视化及换热特性检测装置和方法

Also Published As

Publication number Publication date
EP0160884A3 (en) 1986-05-21
EP0160884B1 (fr) 1990-08-29
DE3579357D1 (de) 1990-10-04
ATE56084T1 (de) 1990-09-15

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