EP0279771A1 - Méthode de régulation du débit d'air de combustion pour une source de chaleur chauffée au carburant - Google Patents

Méthode de régulation du débit d'air de combustion pour une source de chaleur chauffée au carburant Download PDF

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Publication number
EP0279771A1
EP0279771A1 EP88730029A EP88730029A EP0279771A1 EP 0279771 A1 EP0279771 A1 EP 0279771A1 EP 88730029 A EP88730029 A EP 88730029A EP 88730029 A EP88730029 A EP 88730029A EP 0279771 A1 EP0279771 A1 EP 0279771A1
Authority
EP
European Patent Office
Prior art keywords
line
speed
gas
value
fan
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
EP88730029A
Other languages
German (de)
English (en)
Other versions
EP0279771B1 (fr
Inventor
Winfried Dr. Hangauer
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.)
N.V. VAILLANT S.A.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
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 Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd filed Critical Vaillant Austria GmbH
Publication of EP0279771A1 publication Critical patent/EP0279771A1/fr
Application granted granted Critical
Publication of EP0279771B1 publication Critical patent/EP0279771B1/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
    • F23N1/04—Regulating fuel supply conjointly with air supply and with draught
    • F23N1/042—Regulating fuel supply conjointly with air supply and with draught 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
    • F23N2225/18—Measuring temperature feedwater 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
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the present invention relates to a method for controlling the combustion air flow rate of a fuel-heated heat source.
  • a fuel-heated heat source is understood to mean any gas or oil-heated device, be it an oven, water heater or circulating water heater for heating and process water preparation.
  • the present invention is based on the object of specifying a method for regulating the combustion air throughput, in which it is no longer necessary to separately adapt the pipes and tube guides for the fresh air supply / exhaust gas discharge and in which a stable behavior of the combustion air throughput is established, regardless of this whether it is a device with air-side and gas-side modulation or only air-side modulation.
  • the advantage of this solution lies in the independent adaptation of the combustion air throughput to the device-typical resistances in the air and exhaust gas path due to the installation location. There is always an optimal size of the air throughput with regard to the efficiency, since the air throughput is always a certain, but definable threshold above the switch-off criterion, that is, the unsanitary combustion.
  • a circulating water heater 1 has a housing 2, which in its interior 3 forms a combustion chamber which is shielded from the top by a further inner housing 4.
  • the interior 3 is penetrated by a heat exchanger 5, which is connected to a return line 6 and to a flow line 7, in which a flow temperature sensor 8 is arranged, which is connected via a line 9 to a controller 10.
  • the flow line 7 is provided with a circulation pump 11, the drive motor 12 of which is supplied with operating voltage from the controller 10 via a line 13.
  • the flow line 7 leads downstream of the pump 11 to a heating system 14, which consists of a plurality of radiators, underfloor heating sections or a domestic hot water tank connected in series and / or in parallel, to which the return line 6 is connected on the return side.
  • the heat exchanger 5 is heated by a gas burner 15, which is fed from a gas line 16, in which a shut-off valve 17 is arranged, the electromagnet 18 of which is fed by a control line 19 which originates from the controller 10.
  • a proportional control valve 20 the electromagnet 21 of which is equally connected to the controller 10 via a control line 22.
  • the inner housing 4 merges into an exhaust gas line 23, in which a fan 24 is arranged, the associated motor of which is supplied from an actuating line 25 with operating voltage is opened, which comes from a speed controller 26.
  • a speed actual value transmitter 27 is assigned to the fan and is connected to the speed controller 26 via a measuring line 28.
  • a speed setpoint value is fed to the speed controller via a line 29 which starts from the controller 10.
  • a target value transmitter 30 is connected to the controller 10, with which a target value for the flow temperature of the heating system can be specified.
  • the outer housing 2 is connected to an outer tube 31, which extends concentrically and at a distance 32 from the exhaust pipe 23, which forms the inner tube.
  • the length of the concentric double pipe 31/23 from the installation location of the fan directly in the device to a breakthrough through a boundary wall 33 of the installation space is almost as long as possible, but in practice is limited to a range of three to five meters.
  • the double tube passes through the wall and ends in a head 34 in the outside atmosphere.
  • An anemometer sensor 35 is assigned to the supply air path and reports a continuous signal for the air throughput to an anemometer 37 via a line 36.
  • a further input of the anemometer is formed by line 22, and output signals of the anemometer are sent to controller 10 via line 38, here an enable signal, and via line 39, here a correction signal.
  • the device in the controller 10 has a temperature controller.
  • the actual value of the flow temperature is detected by sensor 8 and reported to controller 10 via line 9.
  • a comparison is made with the temperature target value specified on the target value transmitter 30, and the device is put into operation in the event of a control deviation.
  • the magnet 18 is first excited so that the gas valve 17 opens fully.
  • a more or less large control signal results on line 22, so that the magnet 21 is subjected to partial load or full load values, so that the valve 20 opens more or less.
  • a setpoint value for a suitable air throughput is given to the anemometer 37 via line 22.
  • the speed controller 26 is first activated via the line 29, so that the fan 24 first starts at the maximum speed and is then reduced to a value which is suitable for the expected gas throughput.
  • the speed of the fan is then regulated in control loop 27, 28, 26, 25 at this speed.
  • the combustion air flow rate which arises due to the fan working is generated from the atmosphere via the head 34 promotes and penetrates the supply air path, which corresponds to the distance 32 outside the device.
  • the supply air path is the distance between the two housings 2 and 4 in which the anemometer sensor 35 is arranged.
  • the air flow rate which arises is measured as an actual value by the latter and is fed via line 36 to the anemometer.
  • a target-actual comparison takes place here, and if a minimum throughput matching the expected gas throughput is exceeded, the controller 10 is released via the line 38, so that the two gas valves 17 and 20 can now open accordingly.
  • the gas emerging from the burner 15 is ignited, the burner burns and heats the heat exchanger 5, and the flow temperature rises. If the actual air throughput falls below the minimum threshold which is variable depending on the gas throughput, the controller is blocked via line 38, so that both gas valves close.
  • the relationship between the target value for the speed controller on line 29 and the actual value of the gas throughput, corresponding to a certain voltage on line 22, is fixed. However, the relationship between the air flow rate and the actual value of the fan speed is by no means fixed. The relationship between the actual value of the gas throughput and the switch-off threshold for the anemometer is also fixed.
  • the voltage USMV for the degree of opening of the gas solenoid valve is plotted in the abscissa, the values for the gas throughput Q and for the desired or actual value of the speed of the fan are plotted in the ordinate.
  • the sloping part of the curves means the modulation range, the horizontal part the full load state. The zero point shift comes about because one wants to suppress working of the device below a certain partial load range.
  • FIG. Three additionally shows the curves for the voltage of the anemometer (UA) and the voltage of the switch-off threshold (US).
  • the curve US defines the switch-off threshold.
  • the curve US is laid out in such a way that, taking into account the properties typical of the device, it is still hygienically perfect Allows combustion. Falling below this threshold therefore results in unsanitary combustion and must therefore be avoided in any case.
  • the voltage UA is an internal voltage in the anemometer 37, it is variable with the signal from the anemometer sensor 35. If the curves US and UA coincide, this means that the combustion is just hygienic.
  • a widening of the curves of the US and UA means an operation with an efficiency that gets worse the further the curves are apart.
  • curve UA depends on the actual air flow. This is influenced by the fan speed and by changes in the entire air exhaust system of the heat source, for example also by pollution.
  • the aim now is to set the value of UA as close as possible to the value of US, but without reaching or falling below the value for US.
  • the anemometer 37 has a difference generator and forms the difference between the actual value of the air throughput, given by the sensor 35, expressed by UA and the value of the switch-off threshold US.
  • This difference is dependent on the load on the device, that is to say on the open state of the solenoid valve 20/21, that is to say on the signals prevailing on the line 22.
  • the difference is compared with a target value, which in the Anemometer 37 can be predetermined.
  • the target value can be constant, but can also be variable via the load on the device. If the value of this difference falls below a predeterminable size, the speed of the fan motor is increased and if it falls below this, the target value for the speed controller 26 is tracked via the line 39 and the controller 10. This variation of the speed then leads to a shift of the curve UA in the direction of correction.
  • the difference is defined by the distance 50.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
EP88730029A 1987-02-07 1988-02-06 Méthode de régulation du débit d'air de combustion pour une source de chaleur chauffée au carburant Expired - Lifetime EP0279771B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703839 1987-02-07
DE3703839 1987-02-07

Publications (2)

Publication Number Publication Date
EP0279771A1 true EP0279771A1 (fr) 1988-08-24
EP0279771B1 EP0279771B1 (fr) 1994-12-14

Family

ID=6320517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730029A Expired - Lifetime EP0279771B1 (fr) 1987-02-07 1988-02-06 Méthode de régulation du débit d'air de combustion pour une source de chaleur chauffée au carburant

Country Status (3)

Country Link
EP (1) EP0279771B1 (fr)
AT (1) ATE115710T1 (fr)
DE (1) DE3852407D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612960A1 (fr) * 1993-02-26 1994-08-31 General Electric Company Système de contrôle d'écoulement d'air à tirage forcé
GB2304878A (en) * 1995-09-12 1997-03-26 Satermic S L Forced draft controlling device for gas-oil heaters
EP1002998A2 (fr) * 1998-11-20 2000-05-24 Robert Bosch Gmbh Appareil de chauffage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682826A (en) 1993-02-22 1997-11-04 General Electric Company Systems and methods for controlling a draft inducer for a furnace
US5680021A (en) 1993-02-22 1997-10-21 General Electric Company Systems and methods for controlling a draft inducer for a furnace
US5616995A (en) 1993-02-22 1997-04-01 General Electric Company Systems and methods for controlling a draft inducer for a furnace
US5676069A (en) 1993-02-22 1997-10-14 General Electric Company Systems and methods for controlling a draft inducer for a furnace
CN109612073B (zh) * 2018-12-17 2021-03-23 成都前锋电子有限责任公司 燃气热水器和壁挂炉自适应烟道压力变化的点火控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2356367B1 (de) * 1973-11-12 1975-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Regelanordnung zur Luftmangelsicherung für Dampferzeuger
FR2491589A1 (fr) * 1980-10-08 1982-04-09 Bosch Gmbh Robert Dispositif de regulation de temperature pour chauffe-eau chauffes au gaz et au fuel
NL8102571A (nl) * 1981-05-26 1982-12-16 Neom Bv Inrichting voor het verhitten van een stromend warmtetransporterend fluidum.
EP0073717A1 (fr) * 1981-08-27 1983-03-09 Saunier Duval Eau Chaude Chauffage - Sdecc Chaudière à gaz étanche à tirage forcé avec régulation par microprocesseur
DE3509652A1 (de) * 1984-03-30 1985-10-10 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Regeleinrichtung fuer das brennstoff-luftverhaeltnis einer brennstoffbeheizten waermequelle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2356367B1 (de) * 1973-11-12 1975-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Regelanordnung zur Luftmangelsicherung für Dampferzeuger
FR2491589A1 (fr) * 1980-10-08 1982-04-09 Bosch Gmbh Robert Dispositif de regulation de temperature pour chauffe-eau chauffes au gaz et au fuel
NL8102571A (nl) * 1981-05-26 1982-12-16 Neom Bv Inrichting voor het verhitten van een stromend warmtetransporterend fluidum.
EP0073717A1 (fr) * 1981-08-27 1983-03-09 Saunier Duval Eau Chaude Chauffage - Sdecc Chaudière à gaz étanche à tirage forcé avec régulation par microprocesseur
DE3509652A1 (de) * 1984-03-30 1985-10-10 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Regeleinrichtung fuer das brennstoff-luftverhaeltnis einer brennstoffbeheizten waermequelle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 202 (M-405)[1925], 20. August 1985; & JP-A-60 064 122 (TATEISHI DENKI K.K.) 12-04-1985 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612960A1 (fr) * 1993-02-26 1994-08-31 General Electric Company Système de contrôle d'écoulement d'air à tirage forcé
US5418438A (en) * 1993-02-26 1995-05-23 General Electric Company Draft inducer air flow control
US5557182A (en) * 1993-02-26 1996-09-17 General Electric Company System and methods for controlling a draft inducer to provide a desired operating area
GB2304878A (en) * 1995-09-12 1997-03-26 Satermic S L Forced draft controlling device for gas-oil heaters
EP1002998A2 (fr) * 1998-11-20 2000-05-24 Robert Bosch Gmbh Appareil de chauffage
EP1002998A3 (fr) * 1998-11-20 2003-01-02 Robert Bosch Gmbh Appareil de chauffage

Also Published As

Publication number Publication date
ATE115710T1 (de) 1994-12-15
EP0279771B1 (fr) 1994-12-14
DE3852407D1 (de) 1995-01-26

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