EP1635117A1 - Verfahren zur Regelung des Luft-Brennstoffverhältnisses eines Brenners und Brenner zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Regelung des Luft-Brennstoffverhältnisses eines Brenners und Brenner zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP1635117A1
EP1635117A1 EP05291886A EP05291886A EP1635117A1 EP 1635117 A1 EP1635117 A1 EP 1635117A1 EP 05291886 A EP05291886 A EP 05291886A EP 05291886 A EP05291886 A EP 05291886A EP 1635117 A1 EP1635117 A1 EP 1635117A1
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EP
European Patent Office
Prior art keywords
air
gas
differential pressure
burner
pressure sensor
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.)
Withdrawn
Application number
EP05291886A
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English (en)
French (fr)
Inventor
Christophe Pechoux
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.)
A Theobald SA
Original Assignee
A Theobald SA
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Filing date
Publication date
Application filed by A Theobald SA filed Critical A Theobald SA
Publication of EP1635117A1 publication Critical patent/EP1635117A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake 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
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector

Definitions

  • the present invention relates to the field of gas burners, and more precisely the burners comprising an active regulation device of the air / gas ratio.
  • the burner of the prior art comprises an air / gas mixer located upstream of the burner, an air duct containing a calibrated air diaphragm and connected to a first inlet of said air / gas mixer, a gas supply pipe. containing a calibrated gas diaphragm and connected to a second inlet of said air / gas mixer. It further comprises means for adjusting the flow rates of air and gases sent to said air / gas mixer arranged upstream of said calibrated air and gas diaphragms.
  • a differential pressure measuring device is connected to provide a measurement signal representative of at least one of the air flow parameters in the air line, the difference of the air and gas pressures in the air line. the air and gas lines and the gas flow in the gas line (38) so that the amount of gas sent to the air / gas mixer (36) is such that the air / gas ratio has a value predefined.
  • Each of the differential pressure measuring devices comprises a differential pressure sensor having first and second inlet ports respectively connected to first and second pressure taps, one of which comprises a calibrated orifice and an outlet which, in use, delivers a signal representative of a pressure difference between the first and second inlet ports of said two-way valve.
  • a first channel is connected to that of the first and second pressure taps in which is inserted said calibrated orifice of constriction between this calibrated orifice and the corresponding inlet of the sensor and a second channel is connected to the other of first and second pressure taps.
  • the calibrated orifice has a passage section much smaller than that of said two-way valve isolating from each other the two inlet ports, when in a first state, and places them in communication with each other. with each other, when in a second state.
  • the device of the prior art further comprises storage means connected to the output of each sensor for storing at least two values of the output signal of each sensor and a control unit connected to said two-way valve and the means of memory for switching said two-way valve and controlling storage of a first value of the sensor output signal when the two-way valve is in its first state, and storing a second value of the sensor output signal in said storage means when the two-way valve is in its second state. It further comprises means for calculating the difference between said first and second values of the sensor output signal said storage means and said difference calculating means forming a measurement circuit which outputs a measurement signal representing the exact value the difference of the pressures respectively applied to the first and second inlet ports of each sensor.
  • United States Patent US4645450 discloses a flow control system which optimally adjusts the air and fuel rate supplied to a burner in a plurality of operating modes including the entire burner heating range.
  • the system includes a pair of differential pressure sensors connected between the air line and the burner, and between the fuel line and the burner, as well as a pair of air and fuel valves, operated at the same time. electricity to adjust the air and fuel pressure for the burner.
  • the system further includes a microprocessor controller electrically connected to the pressure sensors and the air and fuel pressure control valves. Optimum air / fuel pressure ratios are empirically derived at each point in the burner heating range by connectable releasable flux meters, oxygen sensors, and thermoelectric couples. This information is stored in the memory of the microcomputer control device.
  • the use of a microcomputer control device in combination with a connectable and removable flowmeter and with a thermoelectric torque makes it possible to easily re-adapt the system to an existing burner without the need to install flowmeters to thin-walled diaphragm
  • Japanese patent application JP59212622 discloses a differential pressure measuring device for the regulation of the air / gas ratio, using a differential sensor.
  • the object of the present invention is to provide a burner comprising a simplified control device, with a single differential pressure sensor and no three-way valve, the calibration being performed by a processing of the information provided by the differential sensor and optionally by the temperature sensor of the heating body, thanks to an automatic calibration procedure.
  • the value of the temperature is provided by the temperature sensor of the heating body.
  • the value of the temperature is provided by the temperature sensor of the supply air or the flue gas temperature.
  • the reference differential pressure ⁇ P ref is equal to 100 pascals.
  • the method comprises a step of resetting the differential pressure sensor of opening an autozero valve placed on a conduit connecting the two inputs of the pressure sensor, to interrupt the supply of the fan motor and recording the value of the signal S 0 delivered by the differential pressure sensor, then closing the autozero valve and subtracting S 0 from the measurement.
  • the method comprises an ignition procedure comprising a step of passage of the engine regulation by the pressure sensor to a regulation of the engine with the tachometer, to a value N ref , a ignition step after the opening of the modulating gas valve and reading the differential pressure air / gas, and a step of controlling the gas modulating valve by a control algorithm which takes as input signal the sensor of differential air / gas pressure.
  • the air / gas pressure difference ⁇ P air / gas is regulated at a first predetermined value, for example 5 pascals during the ignition phase to facilitate ignition.
  • the air / gas pressure difference ⁇ P air / gas is regulated at a second predetermined value, for example Example 0 pascal after the ignition phase to obtain a good air / gas ratio.
  • the regulation of the fan motor speed as a function of the heating power is limited by N min (T) and N max (T) values, which are a function of the temperature T measured during the operation of the burner and the value is the value N ref before the ignition of the burner.
  • the invention also relates to a burner for a boiler, comprising a mixing chain fed by an air / gas mixture via a regulating device comprising a fan driven by a variable speed electric motor connected to the mixing chamber. via a duct having a calibrated diaphragm, and a pressurized fuel gas supply opening into said mixing chamber via a proportional valve and a calibrated diaphragm, characterized in that it comprises a single differential pressure sensor, connected on the one hand to the air supply duct, and on the other hand to the pressurized gas supply duct, upstream of the calibrated diaphragms, the burner further comprising a calculator for periodically determining and storing at least one parameter 1, k representative of the characteristics of the flue gas duct during steps calibration unit where said computer stores the rotational speed N ref of the fan motor for a reference differential pressure P ref measured by said differential pressure sensor, and calculates as a function of these parameters the values N min and N max corresponding to the limit respectively lower and upper speed of the motor.
  • FIG. 1 showing a schematic view of an example of a burner according to the invention.
  • This burner comprises a mixing chamber (1) in which opens an air supply duct (2) and a gas supply duct (3).
  • the air supply duct (2) comprises a diaphragm (21) forming a calibrated passage for the flow of air from a fan (22) driven by an electric motor (23).
  • the rotational speed of this motor (23) is regulated by a computer, and it comprises a speed sensor (24) delivering a signal operated by said computer.
  • the gas supply circuit includes a connection (33) to a pressurized gas inlet, controlled by a proportional valve (32).
  • a diaphragm (31) forming a calibrated passage for the gas flow.
  • a differential pressure sensor (10) is connected on the one hand to the air supply duct, upstream of the diaphragm (21), and on the other hand to the gas supply duct, upstream of the diaphragm (31). ).
  • a diaphragm (25) forms a calibrated passage between the sensor (10) and the air duct.
  • the diameter is 5/10 of millimeters.
  • the sensor (10) can be short-circuited by a conduit (11) connecting the two inputs of the sensor (10), this conduit comprising a valve (12) for activating or deactivating the connection of the two inputs of the pressure sensor differential.
  • the valve (12) has, by way of example, a diameter 10 times greater, 5 millimeters to that of the diaphragm (12).
  • a calibration of the differential pressure sensor (10) is carried out. For this, it stops the operation of the motor (23). The opening of the valve (12) is controlled, and the stabilization of the pressures in the duct (11) and in the sensor (10) is waited for a time of about one second.
  • the differential pressure across the sensor (11) is zero due to the connection of the two inputs.
  • the value of the signal delivered by the sensor (10) corresponding to the offset value E, that is to say the zero error indicated by the sensor (10), is then stored.
  • This calibration is carried out periodically, for example at each ignition of the burner, or only after a predetermined duration of use or inactivity.
  • the power terminals are given for the ⁇ P min air and ⁇ P max air.
  • the tachometer that will give the min terminal to the operating temperature ⁇ : N1 ⁇ , and the maximum terminal to the operating temperature ⁇ : N2 ⁇ .
  • the rotational speed of the fan motor will always be between N1 ⁇ and N2 ⁇ .
  • terminals N1 ⁇ and N2 ⁇ depend on the temperature and also on the length of the flue pipe on which the boiler is installed.
  • N100 mini short mini 0 ° mini 10 ° mini 80 ° 91 ° N1 leads N1 max N1 max ... N1 max ... N1 max 91 ° long 0 ° 10 ° 80 ° N2 leads N2 max N2 max ... N2 max ... N2 max 91 ° long 0 ° 10 ° 80 ° N100 leads N100 N100 ... N100 ... N100 long max 0 ° max 10 ° up to 80 ° up to 91 °
  • the degree of ownership of the boiler equipped with the unknown flue pipe is calculated for the "short duct" assembly and the "long duct” assembly.
  • the microcontroller continuously determines the temperature range and calculate N1 ⁇ and N2 ⁇ with the appropriate data from the "experimental data table".
  • NOT 1 ⁇ K * NOT 1 mini ⁇ + 1 * NOT two maxi ⁇
  • NOT two ⁇ K * NOT two mini ⁇ + 1 * NOT two maxi ⁇
  • the fan speed is regulated between N1 ⁇ and N2 ⁇ according to the needs of the temperature control.
  • AUTOZERO "IN FLIGHT" At regular intervals it is necessary to recalibrate the sensor zero during burner operation. the burner is on, we wait 10 minutes and go to the next step.
  • the autozero valve (12) is opened and the pressures are expected to stabilize 1s and proceed to the next step.
  • the selfzero valve (12) is then closed again and the controls of the motor and the autozero valve take over.

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  • 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)
EP05291886A 2004-09-14 2005-09-13 Verfahren zur Regelung des Luft-Brennstoffverhältnisses eines Brenners und Brenner zur Durchführung dieses Verfahrens Withdrawn EP1635117A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452044A FR2875289B1 (fr) 2004-09-14 2004-09-14 Procede pour la regulation du rapport air/gaz d'un bruleur et bruleur mettant en oeuvre ce procede

Publications (1)

Publication Number Publication Date
EP1635117A1 true EP1635117A1 (de) 2006-03-15

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EP05291886A Withdrawn EP1635117A1 (de) 2004-09-14 2005-09-13 Verfahren zur Regelung des Luft-Brennstoffverhältnisses eines Brenners und Brenner zur Durchführung dieses Verfahrens

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EP (1) EP1635117A1 (de)
FR (1) FR2875289B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120030A1 (it) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co Metodo per il controllo di un bruciatore di una caldaia e sistema di controllo operante in accordo con tale metodo
CN109442405A (zh) * 2018-12-26 2019-03-08 广州威茨热能技术有限公司 一种空燃比例混合器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2921461B1 (fr) * 2007-09-24 2010-03-12 Theobald Sa A Dispositif de regulation des debits de gaz alimentant un bruleur equipe d'un tel dispositif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5946417A (ja) * 1982-09-10 1984-03-15 Matsushita Electric Ind Co Ltd 燃焼制御装置
JPS59212622A (ja) 1983-05-18 1984-12-01 Matsushita Electric Ind Co Ltd ガス燃焼制御装置
US4645450A (en) 1984-08-29 1987-02-24 Control Techtronics, Inc. System and process for controlling the flow of air and fuel to a burner
EP0644377A1 (de) * 1993-09-16 1995-03-22 Honeywell B.V. Regeleinrichtung für Gasbrenner
FR2775782A1 (fr) 1998-03-06 1999-09-10 Theobald Sa A Dispositif de mesure de pression differentielle et dispositif pour la regulation active du rapport air/gaz d'un bruleur utilisant un tel dispositif de mesure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5946417A (ja) * 1982-09-10 1984-03-15 Matsushita Electric Ind Co Ltd 燃焼制御装置
JPS59212622A (ja) 1983-05-18 1984-12-01 Matsushita Electric Ind Co Ltd ガス燃焼制御装置
US4645450A (en) 1984-08-29 1987-02-24 Control Techtronics, Inc. System and process for controlling the flow of air and fuel to a burner
EP0644377A1 (de) * 1993-09-16 1995-03-22 Honeywell B.V. Regeleinrichtung für Gasbrenner
EP0644377B1 (de) 1993-09-16 1996-10-23 Honeywell B.V. Regeleinrichtung für Gasbrenner
FR2775782A1 (fr) 1998-03-06 1999-09-10 Theobald Sa A Dispositif de mesure de pression differentielle et dispositif pour la regulation active du rapport air/gaz d'un bruleur utilisant un tel dispositif de mesure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 148 (M - 308) 11 July 1984 (1984-07-11) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120030A1 (it) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co Metodo per il controllo di un bruciatore di una caldaia e sistema di controllo operante in accordo con tale metodo
WO2013117516A1 (en) * 2012-02-09 2013-08-15 Sit La Precisa S.P.A. Con Socio Unico A method for controlling a burner of a boiler and a control system operating according to this method
CN109442405A (zh) * 2018-12-26 2019-03-08 广州威茨热能技术有限公司 一种空燃比例混合器
CN109442405B (zh) * 2018-12-26 2023-12-05 广州威茨热能技术有限公司 一种空燃比例混合器

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Publication number Publication date
FR2875289B1 (fr) 2006-11-10
FR2875289A1 (fr) 2006-03-17

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