EP0890790B1 - Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé - Google Patents

Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé Download PDF

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Publication number
EP0890790B1
EP0890790B1 EP97111687A EP97111687A EP0890790B1 EP 0890790 B1 EP0890790 B1 EP 0890790B1 EP 97111687 A EP97111687 A EP 97111687A EP 97111687 A EP97111687 A EP 97111687A EP 0890790 B1 EP0890790 B1 EP 0890790B1
Authority
EP
European Patent Office
Prior art keywords
rotary speed
motor
burner
control arrangement
change rate
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.)
Expired - Lifetime
Application number
EP97111687A
Other languages
German (de)
English (en)
Other versions
EP0890790A1 (fr
Inventor
Klaus Bott
Eckhard Schwendemann
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.)
Siemens Building Technologies AG
Original Assignee
Siemens Building Technologies 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 Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP97111687A priority Critical patent/EP0890790B1/fr
Priority to DE59706767T priority patent/DE59706767D1/de
Publication of EP0890790A1 publication Critical patent/EP0890790A1/fr
Application granted granted Critical
Publication of EP0890790B1 publication Critical patent/EP0890790B1/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
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic 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
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time program acting through electrical means, e.g. using time-delay relays

Definitions

  • the invention relates to a control device, in particular a burner control, for one Fan burners of the type mentioned in the preamble of claim 1.
  • Automatic burner controls are used to control and monitor the combustion in heat generation systems, that run on liquid or gaseous fuels.
  • Such burner controls are, for example, from the Landis & Gyr company publication "Automatic burner controls for oil and Gasbrenner ", L ..., published September 1976, with the help of such a burner control air blower, fuel pump (e.g. oil pump), fuel valve and ignition device controlled. This means that the commissioning process for a burner can be controlled and monitored as also the operation following such a commissioning process.
  • a device with a is suitable for use with burners of small to medium power Automatic furnaces according to the preamble of claim 1, as in the European Patent application EP 614 048 is described.
  • burners is used as a fan drive Speed-controllable DC motor with integrated control electronics and integrated sensor for detection the speed, with a control and a on the motor in addition to the voltage supply connection There is a feedback connection for the setpoint or actual value of the speed.
  • a burner control for a forced draft burner which is mentioned in the preamble of claim 1 known from DE 44 10 735.
  • the invention has for its object a burner control for a forced draft burner to propose, in which the amount of air supplied to the forced draft burner without air flap is simple Way is controllable.
  • a heating circuit controller integrated in the automatic firing unit 1 or an external heating circuit controller interacting with the automatic firing unit 1 determines the burner output required to cover the heat requirement.
  • the automatic burner control 1 on the one hand continuously controls the fuel valve 3, with which the fuel conveyed through a fuel line 12, for example oil or gas, is fed to the combustion chamber, and on the other hand the speed controller 11.
  • the size of the heat demand signal thus determines the degree of opening of the fuel valve 3 and the conveyed air volume flow V L.
  • an asynchronous motor is provided as the motor.
  • the speed controller 11 is thus a frequency converter.
  • the control of the speed controller 11 by the burner control unit 1 takes place by the burner control unit 1 specifying the change rate ⁇ N target for changing the speed and the time period t 1 , whereupon the speed controller 11 increases the speed of the motor 10 in accordance with the rate ⁇ N target during the time period t 1 or humiliated.
  • the air volume flow V L delivered at a certain speed of the blower motor 10 depends, among other things, on the flow resistance of the air duct 4, the combustion chamber and the exhaust stack.
  • the first air pressure switch 6 is set such that it switches to the ON position when the pressure in the air duct 4 exceeds a predetermined minimum pressure p 1 .
  • the second air pressure switch 7 switches to the ON position when the pressure in the air duct 4 reaches a value p 2 which corresponds to the conveyed air volume flow V L at full load.
  • the relative speed N r1 at which the first air pressure switch 6 switches, is assigned the value 0 percent, for example, and the relative speed N r2 , at which the second air pressure switch 7 switches, the value 100 percent.
  • the forced draft burner 2 first runs through an actual start-up program, in the course of which the automatic burner control system 1 sets the speed of the blower motor 10 such that the air pressure in the air duct 4 is just sufficient for the first air pressure switch 6 to be switched on and to remain on.
  • the relative rotational speed N r, x is transmitted over the unit 1 the command to the speed controller 11, the rotational speed with the rate .DELTA.N to t x increase over time.
  • the size .DELTA.N r is a according to a later explained measurement method specific, the target rate of change .DELTA.N corresponding to actual change rate.
  • the relative speed N r, y corresponds, then 1 transmits the control box the command to the speed controller 11, the rotational speed with the rate .DELTA.N to during time t y to increase or decrease, depending on whether the new volume flow V y is greater or less than the current volume flow V x .
  • the speed of the motor 10 is changed relatively slowly, since the heat control often requires only small changes.
  • the commissioning program begins with a purging of the combustion chamber.
  • the speed of the air blower 5 is increased as quickly as possible to the maximum speed corresponding to the full load.
  • the calibration of the actual rate of change .DELTA.N r is, therefore takes place with a relatively small target change rate .DELTA.N should, therefore the air flow rate is possible in the controller operation, a precise control, while the start-up of the fan burner 2 takes place with the greatest possible desired rate of change.
  • the automatic burner control unit 1 is repeated periodically, for example every 20th commissioning, the calibration of the actual change rate ⁇ N r is repeated and a plausibility test is also carried out to determine whether the new actual change rate ⁇ N r is within predetermined tolerance values of the old actual - Rate of change corresponds. If the deviation is too great, there could be a break in the rigid coupling between the motor 10 and the air blower 5. In this case, the automatic burner control unit 1 performs a safety shutdown.
  • the speed N of the motor 10 is controlled or regulated in accordance with the power requirement. Therefore, the speed controller 11 receives control commands continuously. However, a large number of these control commands cause only small changes in the speed N. Since the combination of motor 10 and air blower 5 is rather sluggish because of the masses involved, it may be that after m control commands the time periods t 1 , t 2 , ..., t m the speed N does not have the value that it would have if a single control command of the time period would have happened. It is therefore advantageously provided that the actual change rate ⁇ N r is to be recalibrated. The recalibration can be carried out, for example, after a predetermined number of control commands.
  • the recalibration can also take place whenever one of the air pressure switches 6, 7 is started up anyway.
  • the recalibration can also be provided if the air pressure switches 6, 7 have not been started for a predetermined period of time.
  • the automatic burner control 1 therefore causes the speed N of the motor 10 to either be increased until the second air pressure switch 7 turns on, or decreased until the first air pressure switch 6 turns off and then compares whether the time required for this with the time calculated according to equation (2) does not match , the value N r1 or N r2 being used for N r, y .
  • the closer to the air pressure switch 6, 7 is advantageously approached.
  • the actual value of the change rate ⁇ N r, ist can be corrected.
  • the rate of change ⁇ N r can either be redetermined in accordance with the method according to the invention, or the fan burner 2 can be switched off safely.
  • the automatic burner control unit 1 transmits the command to the speed controller 11, the speed of the motor 10 at the rate ⁇ N is said to increase.
  • the automatic burner control unit 1 starts the time measurement to determine the time period ⁇ t. The time measurement is stopped as soon as the second air pressure switch 7 switches on because the predetermined pressure p 2 in the air duct 4 has been reached.
  • the automatic burner control unit 1 sends the speed controller 11 the command not to increase the speed of the engine 10 any further.
  • the burner control now calculates the actual value of the rate ⁇ N ist according to equation (3).
  • the air duct 4 and the combustion chamber are then thoroughly flushed with air.
  • the conveyed air volume flow is then reduced again to a value that generates the minimum pressure p 1 , for example.
  • any air volume flows can now be set according to equation (2).
  • the invention can also be used if only the air pressure switch 7 is present, which switches on when the air pressure p reaches a predetermined maximum value p 2 .
  • the automatic heating system 1 determines the rate .DELTA.N is by measuring the time required for the engine 10 to start up from standstill and reach the rotation speed N 2, in which the air pressure switch 7 reports that the pressure p 2 is reached.
  • Certain speed controllers provide a digital or analog signal that indicates the current speed.
  • the analog signal is e.g. available as 0 - 10 volt signal, with 0 V standstill and 10 V the maximum Designate speed.
  • the current one is Speed can be queried as a digital variable.
  • the Automatic burner control after a command to change the speed that reported by the speed controller Signal about the current speed analyzed and processed. Provided, that the reported signal meets the safety requirements can be used directly Monitoring and, if necessary, correction of the speed can be used.

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)

Claims (6)

  1. Dispositif de commande, en particulier un automate à brûleur (1), pour un brûleur à air soufflé (2), avec une soufflante d'air (5), un régulateur de vitesse de rotation (11) commandant la vitesse de rotation du moteur (10) de la soufflante d'air (5), et le dispositif de commande (1) commandant et surveillant un processus de mise en service et un fonctionnement permanent du brûleur à air soufflé (2), caractérisé en ce qu'un premier et un deuxième interrupteurs de pression d'air (6, 7) sont prévus, le premier interrupteur de pression d'air (6) réagissant lorsque la soufflante d'air (5) génère une première pression d'air p1 et le deuxième interrupteur de pression d'air (7) réagissant lorsque la soufflante d'air (5) génère une deuxième pression d'air p2, en ce que, pour étalonner une vitesse de variation réelle ΔNr,réelle, le dispositif de commande (1)
    a) dicte au régulateur de vitesse de rotation (11) d'augmenter la vitesse de rotation N du moteur (10) sous une vitesse de variation de consigne ΔNconsigne prédéterminée,
    b) détermine l'intervalle de temps Δt qui s'écoule entre la réaction du premier et du deuxième interrupteur de pression d'air (6, 7) et
    c) calcule la vitesse de variation réelle ΔNr,réelle, et
    en ce que le dispositif de commande (1) est agencé pour régler une vitesse de rotation librement choisie en fonctionnement normal sur le moteur (10), par le fait qu'il dicte au régulateur de vitesse de rotation (11) de modifier la vitesse de rotation N, à la vitesse de variation de consigne ΔNconsigne prédéterminée, pendant un intervalle de temps t1 calculé de manière correspondant à la vitesse de variation réelle ΔNr,réelle.
  2. Dispositif de commande, en particulier automate à brûleur (1), pour un brûleur à air soufflé (2), avec une soufflante d'air (5), un régulateur de vitesse de rotation (11) commandant la vitesse de rotation du moteur (10) de la soufflante d'air (5), et le dispositif de commande (1) commandant et surveillant un processus de mise en service et un fonctionnement permanent du brûleur à air soufflé (2), caractérisé en ce qu'est prévu un interrupteur de pression d'air (7), qui réagit lorsque la soufflante d'air (5) génère une pression d'air P2 maximale, en ce que, pour l'étalonnage d'une vitesse de variation réelle ΔNr,réel, le dispositif de commande (1)
    a) dicte au régulateur de vitesse de rotation (11) d'augmenter la vitesse de rotation N du moteur (10) depuis l'arrêt, à une vitesse de variation de consigne ΔNconsigne prédéterminée,
    b) détermine l'intervalle de temps Δt qui s'écoule entre le démarrage du moteur (10) et la réaction de l'interrupteur de pression d'air (6), et
    c) calcule la vitesse de variation réelle ΔNr,réelle, et
    en ce que le dispositif de commande (1) est agencé pour régler une vitesse de rotation librement choisie en fonctionnement normal sur le moteur (10), par le fait qu'il dicte au régulateur de vitesse de rotation (11) de modifier la vitesse de rotation N, à la vitesse de variation de consigne ΔNconsigne prédéterminée, pendant un intervalle de temps t1 calculé de manière correspondant à la vitesse de variation réelle ΔNr,réelle.
  3. Dispositif de commande selon la revendication 1 ou 2, caractérisé en ce qu'il est conçu pour commander un régulateur de vitesse de rotation (11) conçu pour un moteur à courant alternatif, en particulier un convertisseur de fréquence.
  4. Dispositif de commande selon la revendication 1 ou 2, caractérisé en ce qu'il est conçu pour commander un régulateur de vitesse de rotation (11) conçu pour un moteur à courant continu.
  5. Dispositif de commande selon l'une des revendications 1 à 4, caractérisé en ce qu'il effectue des ré-étalonnages de la vitesse de variation réelle ΔNr.réelle, lorsque le brûleur à air soufflé (2) est en fonctionnement normal.
  6. Dispositif de commande selon l'une des revendications 1 à 5, caractérisé en ce que l'intervalle de temps t1 calculé est augmenté ou abaissé d'une valeur τ, prenant en compte l'inertie du système constitué par le moteur (10) et la soufflante d'air (5).
EP97111687A 1997-07-08 1997-07-08 Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé Expired - Lifetime EP0890790B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97111687A EP0890790B1 (fr) 1997-07-08 1997-07-08 Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé
DE59706767T DE59706767D1 (de) 1997-07-08 1997-07-08 Steuereinrichtung, insbesondere Feuerungsautomat, für einen Gebläsebrenner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97111687A EP0890790B1 (fr) 1997-07-08 1997-07-08 Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé

Publications (2)

Publication Number Publication Date
EP0890790A1 EP0890790A1 (fr) 1999-01-13
EP0890790B1 true EP0890790B1 (fr) 2002-03-27

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EP97111687A Expired - Lifetime EP0890790B1 (fr) 1997-07-08 1997-07-08 Dispositif de commande, notamment un automate à brûleur, pour un brûleur à air soufflé

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EP (1) EP0890790B1 (fr)
DE (1) DE59706767D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1717514B1 (fr) * 2005-04-29 2015-08-19 Alde International Systems AB Brûleur à gaz et méthodes pour le démarrage et le fonctionnement de ce brûleur
US8070481B2 (en) * 2008-05-27 2011-12-06 Honeywell International Inc. Combustion blower control for modulating furnace
ITBO20100440A1 (it) * 2010-07-12 2012-01-13 Baltur S P A Sistema di controllo di un bruciatore ad aria soffiata

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860231A (en) * 1985-12-16 1989-08-22 Carrier Corporation Calibration technique for variable speed motors
US4688547A (en) * 1986-07-25 1987-08-25 Carrier Corporation Method for providing variable output gas-fired furnace with a constant temperature rise and efficiency
JPH03291411A (ja) * 1990-04-09 1991-12-20 Matsushita Electric Ind Co Ltd 燃焼装置
EP0567060A1 (fr) * 1992-04-21 1993-10-27 Joh. Vaillant GmbH u. Co. Procédé pour commander un brûleur à gaz avec un ventilateur
US5418438A (en) * 1993-02-26 1995-05-23 General Electric Company Draft inducer air flow control
EP0614048A1 (fr) 1993-03-05 1994-09-07 Landis & Gyr Technology Innovation AG Dispositif avec un automate à brûleur
CH688842A5 (de) 1994-03-14 1998-04-15 Landis & Gyr Tech Innovat Einrichtung zur Ansteuerung des Motors des Gebläses eines Gebläsebrenners.

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Publication number Publication date
EP0890790A1 (fr) 1999-01-13
DE59706767D1 (de) 2002-05-02

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