EP1630476A2 - Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage - Google Patents

Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage Download PDF

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Publication number
EP1630476A2
EP1630476A2 EP05017919A EP05017919A EP1630476A2 EP 1630476 A2 EP1630476 A2 EP 1630476A2 EP 05017919 A EP05017919 A EP 05017919A EP 05017919 A EP05017919 A EP 05017919A EP 1630476 A2 EP1630476 A2 EP 1630476A2
Authority
EP
European Patent Office
Prior art keywords
fan
exhaust
fuel
volume flow
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
EP05017919A
Other languages
German (de)
English (en)
Other versions
EP1630476A3 (fr
EP1630476B1 (fr
Inventor
Nicolas Beillevert
Stéphane Daviaud
Lila Menari
Jean-Francois Rouxel
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 GmbH
Original Assignee
Vaillant GmbH
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 Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP1630476A2 publication Critical patent/EP1630476A2/fr
Publication of EP1630476A3 publication Critical patent/EP1630476A3/fr
Application granted granted Critical
Publication of EP1630476B1 publication Critical patent/EP1630476B1/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
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • 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
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products
    • 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
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water

Definitions

  • the invention relates to a method for preventing condensation in fan-assisted fuel-operated heaters.
  • condensation on heating appliances must be avoided.
  • the condensation depends on the fuel, the excess air and the temperatures of the combustion gases, the environment as well as the cooling circuit.
  • the object of the present invention is therefore, on the one hand to optimize the efficiency of a heater with fan support and on the other hand to effectively avoid condensation.
  • this is achieved by detecting the temperature of the exhaust gas collector and comparing it with the achieved dew point of the exhaust gas. Accordingly, if appropriate, the excess air is adjusted, in which the fan promotes more or less exhaust gas or inert air.
  • the fuel gas volume flow flowing through the fuel gas valve is measured by means of a stepping motor whose position is detected.
  • the volume flow through the fan is detected indirectly by a speed detection of the blower.
  • the volume flow through the fan can be detected by a pressure measurement in the exhaust path.
  • the fuel gas with the most unfavorable properties is used to calculate the dew point.
  • the burner load is increased to achieve a higher temperature level.
  • the formula is for methane C H 4 + 2 ⁇ O 2 + 79 21 ⁇ 2 N 2 ⁇ C O 2 + 2 H 2 O + 2 ( ⁇ - 1 ) O 2 + 79 21 ⁇ 2 N 2
  • the real flame temperature is lower than the adiabatic flame temperature because heat radiation from the flame leads to flame cooling.
  • the exhaust gas from the flame reaches a heat exchanger, where it is cooled down as a function of the heat exchanger surface and the cooling circuit temperatures.
  • the exhaust gas cooled in the heat exchanger is then collected in an exhaust gas collector.
  • the exhaust gas collector is flown on one side of the exhaust gas, on the other side is fresh air.
  • the fresh air usually leads to a cooling of the exhaust manifold.
  • the exhaust collector is particularly liable to cause the exhaust gas to condense.
  • FIG. 1 shows a heater with a burner 1 in a combustion chamber 11.
  • the burner 1 consists of three injectors 8. In front of the injectors 8 sitting fuel gas nozzles 7 in a fuel gas manifold 6, which is connected to a fuel gas valve 2 with servo motor 3 and step detection.
  • the fuel gas valve 2 is connected to a fuel gas connection 5, the step detection 4 is connected to a controller 18.
  • Above the burner 1 is a primary heat exchanger 12, above which in turn an exhaust manifold 13 and a fan 15 with motor 16 and speed detection 17, which in turn is connected to the control 18.
  • a Temperature sensor 14 At the exhaust manifold 13 is a Temperature sensor 14, which is also connected to the controller 18.
  • fuel gas flows from the fuel gas port 5 through the fuel gas valve 2 to the fuel gas manifold 6 and from there through the fuel gas nozzles 7 in the injectors 8.
  • primary air 9 is entrained and mixed with the fuel gas in the injectors 8.
  • the fuel gas-air mixture exits the burner plate of the burner 1 and is burned there within the combustion chamber 11.
  • Secondary air 10 flows into the combustion chamber 11 in parallel with the injectors. This mixes with the exhaust gases of the burner 1.
  • the resulting exhaust gas flows through the primary heat exchanger 12 and this gives off energy to a heating circuit.
  • the exhaust gases are collected in the exhaust manifold 13, sucked by the blower 15 and pressed into the environment.
  • FIG. 2 shows a Mollier diagram.
  • the humidity x of the exhaust gas is shown.
  • Line A illustrates the dew point line. The lower the temperature of the exhaust gas, the lower the dew point.
  • the point B illustrates exhaust gas at stoichiometric combustion after cooling in the primary heat exchanger. In order to avoid high carbon monoxide and nitrogen oxide emissions of the exhaust gas, burners are not operated stoichiometrically but overstoichiometrically.
  • the point D results when the air volume flow is increased in a device according to FIG. This increases the inert air content of the combustion. Since the water content in the exhaust gas is given almost exclusively by the fuel input, the absolute amount of water vapor in the exhaust gas remains almost constant.
  • the controller 18 knows the position of the stepping motor 3 via the step number detection 4. Also, the controller 18, the fan speed of the blower 15 is known. From the characteristic significant for the heater can thus be calculated, how high the thermal load of the system is, as well as with which excess air the system is operated. Thus, the theoretical dew point T T can be calculated.
  • the temperature sensor 14 on the exhaust manifold 13 detects the temperature of the exhaust manifold 13 T A and forwards it to the control. There, the two temperatures are compared. If it is determined that the measured temperature T A is not substantially greater than the dew point temperature T T , the controller 18 sends a signal to the motor 16 of the blower 15 to increase its speed.
  • the controller 18 now calculates the new dew point with the new measured values with regard to the fuel gas quantity and the exhaust gas quantity and compares this with the measured temperature T A of the exhaust hood 13. If the difference calculated in this way is too large, the rotational speed of the fan 15 is reduced again until a corresponding target state is reached.
  • the exhaust manifold 13 is initially cold. Therefore, it is usually useful to operate the burner with high load, especially in the starting phase, so as to heat the exhaust manifold quickly. Even in the stationary state, it may be useful instead of clocking operation (frequent switching on and off) to operate the device over a longer period of time to reach higher temperatures of the exhaust manifold here.
  • the inventive method can not only effectively avoid the condensation, but also operate the device such that the efficiency is as high as possible by avoiding excessive excess air.

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)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
EP05017919.1A 2004-08-24 2005-08-18 Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage Expired - Lifetime EP1630476B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0142204A AT414037B (de) 2004-08-24 2004-08-24 Verfahren zur vermeidung der kondensation bei gebläseunterstützten brennstoffbetriebenen heizgeräten

Publications (3)

Publication Number Publication Date
EP1630476A2 true EP1630476A2 (fr) 2006-03-01
EP1630476A3 EP1630476A3 (fr) 2008-05-28
EP1630476B1 EP1630476B1 (fr) 2017-04-26

Family

ID=35406002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05017919.1A Expired - Lifetime EP1630476B1 (fr) 2004-08-24 2005-08-18 Procédé pour réduire la condensation dans les appareils de chauffage par combustion munis d'un ventilateur de tirage

Country Status (4)

Country Link
EP (1) EP1630476B1 (fr)
AT (1) AT414037B (fr)
DE (1) DE102005039072A1 (fr)
ES (1) ES2633606T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009077307A1 (fr) * 2007-12-18 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour faire fonctionner un compresseur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160884A2 (fr) 1984-05-03 1985-11-13 Joh. Vaillant GmbH u. Co. Dispositif de réglage du rapport air-carburant d'une source de chaleur
US4708636A (en) 1983-07-08 1987-11-24 Honeywell Inc. Flow sensor furnace control
EP0793064A2 (fr) 1996-03-01 1997-09-03 Robert Bosch Gmbh Appareil de chauffage et méthode pour régler un appareil de chauffage
DE19961286A1 (de) 1999-12-18 2001-07-26 Bosch Gmbh Robert Verfahren zum Regeln eines Wärmeerzeugers mit einer Luft-Abgas-Führung
DE10158225A1 (de) 2000-11-23 2002-07-18 Vaillant Gmbh Verfahren zur Steuerung eines von einem gebläseunterstützten Brenner beheizten Kessels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337146A1 (de) * 1993-10-30 1995-05-04 Broetje August Gmbh & Co Wärmeerzeuger mit verstellbarem Brenner
DE19941700C1 (de) * 1999-09-02 2000-11-30 Bosch Gmbh Robert Vorrichtung zum Betreiben einer Heizungsanlage
EP1387985B1 (fr) * 2001-05-18 2009-10-07 Bekaert Combustion Technology Bv Bruleurs a gaz a premelange sans condensation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4708636A (en) 1983-07-08 1987-11-24 Honeywell Inc. Flow sensor furnace control
EP0160884A2 (fr) 1984-05-03 1985-11-13 Joh. Vaillant GmbH u. Co. Dispositif de réglage du rapport air-carburant d'une source de chaleur
EP0793064A2 (fr) 1996-03-01 1997-09-03 Robert Bosch Gmbh Appareil de chauffage et méthode pour régler un appareil de chauffage
DE19961286A1 (de) 1999-12-18 2001-07-26 Bosch Gmbh Robert Verfahren zum Regeln eines Wärmeerzeugers mit einer Luft-Abgas-Führung
DE10158225A1 (de) 2000-11-23 2002-07-18 Vaillant Gmbh Verfahren zur Steuerung eines von einem gebläseunterstützten Brenner beheizten Kessels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009077307A1 (fr) * 2007-12-18 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour faire fonctionner un compresseur

Also Published As

Publication number Publication date
EP1630476A3 (fr) 2008-05-28
AT414037B (de) 2006-08-15
EP1630476B1 (fr) 2017-04-26
DE102005039072A1 (de) 2006-03-02
ES2633606T3 (es) 2017-09-22
ATA14222004A (de) 2005-11-15

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