EP0770824B1 - Procédé et circuit pour commander un brûleur à gaz - Google Patents
Procédé et circuit pour commander un brûleur à gaz Download PDFInfo
- Publication number
- EP0770824B1 EP0770824B1 EP96115721A EP96115721A EP0770824B1 EP 0770824 B1 EP0770824 B1 EP 0770824B1 EP 96115721 A EP96115721 A EP 96115721A EP 96115721 A EP96115721 A EP 96115721A EP 0770824 B1 EP0770824 B1 EP 0770824B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- lambda
- gas
- electrical
- burner
- 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
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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
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/26—Measuring humidity
- F23N2225/30—Measuring humidity measuring lambda
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/20—Calibrating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/30—Representation of working time
-
- 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
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- 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
Definitions
- the invention relates to a method for controlling a Gas burner, in particular gas fan burner, with a Measuring electrode, in particular ionization electrode, the one of the combustion temperature or the Lambda actual value derived electrical quantity to a Control circuit sets which this size with a compares the selected electrical setpoint and that Gas-air ratio (lambda) to a corresponding Set Lambda setpoint. Furthermore, the Invention a corresponding control circuit.
- DE 44 33 425 A is one Control device for a gas fan burner described. Through an alternating voltage superimposition, the Evaluate ionization current safely. The respective Air excess (lambda value) of the respective The state of combustion is determined by the ionization electrode detected and in the control circuit with a set Setpoint compared. The composition of the gas-combustion air mixture will be accordingly adjusted so that the end result is always with a desired lambda setpoint is worked. Desired is an over-stoichiometric ratio of air to gas, the lambda setpoint is preferably between 1.15 and 1.3 lies. It is achieved in that at different gas qualities, for example natural gas and LPG, as well as changing Environmental conditions one in terms of emissions and of the firing efficiency Combustion takes place.
- the thermal coupling between the Change the ionization electrode and the gas burner for example by bending, wear and tear Contamination of the ionization electrode or soot of the burner. It has been found that this leads to the fact that despite the lambda value remaining the same Ionization current and thus the derived Measured variable changes. So it changes Proportionality factor between the lambda value and the derived electrical quantity. This one changed measuring voltage at the comparator of the control circuit is present, to which the - unchanged - setpoint acts, the control circuit is the gas-air mixture, ie the lambda value, making it a Deviation of the actual lambda value from the desired lambda value comes what is undesirable.
- the object of the invention is a method and Propose circuit of the type mentioned at the beginning, with the influence of a change in proportionality between the lambda value and the derived one electrical measurand on the scheme in such a way is balanced that the desired gas-air ratio (Lambda setpoint) is maintained.
- the above object is in a method of type mentioned by the features of claim 1 and with regard to the circuit by the features of the Claim 6 solved.
- the control switched off and on for a short time Run through the calibration cycle This is the gas-air mixture necessarily enriched, i.e. the lambda value reduced from> 1.
- the invention is such Avoid adjustment, so that even then desired lambda setpoint is regulated when the between the combustion temperature and the electrical Measurand has changed the existing proportionality factor.
- a gas burner (1) has a speed-adjustable fan (2) that promotes combustion air. He is with one Gas supply (3) in which a gas solenoid valve (3 ') is arranged, provided. In the flame area of the Gas burner (1) is an ionization electrode (4) Measuring electrode arranged. This measuring electrode (4) is at Gas burners common. Usually, however, it only serves the Flame monitoring. The measuring electrode (4) detects the at the respective combustion state Ionization current. This depends on Richardson's Equation from the electrode temperature and thus from the respective lambda value of the respective gas-air mixture from.
- a capacitive Coupling element (5) On the measuring electrode (4) is a capacitive Coupling element (5) an AC voltage, in the example simply the mains AC voltage, switched on.
- the Coupling element (5) is connected to earth via a resistor (6) placed so that the ionization path (flame area) is electrically connected in parallel to the resistor (6).
- a voltage-impedance converter (7) is connected to the measuring electrode (4) a low pass (8) on the output side a control circuit (9) is connected.
- the control circuit (9) of FIG. 1 has a comparator (10) to which a setpoint generator (11) is placed.
- a desired lambda value for example 1.15 to 1.3, corresponding electrical Setpoint adjustable.
- An automatic start (15) is in the control circuit (9) integrated, which controls the switch (13).
- a setpoint generator (16) for one Starting speed.
- the ionization electrode (4) detected ionization current leads to the fact that a direct voltage is superimposed on the alternating voltage. This is proportional to the ionization in the flame area. It is proportional to the respective one Excess air (lambda). In practice, it is between 0 V and 200 V. The voltage is used for further processing reduced and at the exit of the low pass (8) occurs in For example, a DC voltage between 0 V and 10 V on.
- the excess air of the respective gas-air mixture embodied voltage (ionization voltage Ui) is in the Comparator (10) compared with a target value.
- the Difference between the two values is in a stream changed the state of charge of the Storage capacitor (17), which is the instantaneous speed value corresponds as long as changes and thus the Controls the speed of the fan (2) accordingly until the respective excess air (actual lambda value) the target lambda value is equal to.
- the speed is used to set the excess air of the blower (2) or the gas supply (3) regulated.
- the control circuit (9) can also be used as a digital circuit be built with a microprocessor.
- An activation circuit (21) is also provided. This counts those triggered by the automatic start (15) Start processes or records the operating hours of the Gas burner (1). With the activation circuit (21) is a Ramp generator (22) connected to a third Switch position of the switch (13) is connected.
- Detection circuit (23) which is also connected to the Activation circuit (21) is connected and one Storage circuit (24) is connected downstream.
- the Memory circuit (24) is connected to the setpoint device (11) connected.
- the functionality of the additional circuit in one Calibration cycle is about the following:
- the ramp generator (22) now controls the blower (2) or the gas solenoid valve (3 ') in such a way that the Gas-air mixture is "enriched", ie the Gas content increased.
- the lambda value is one Value> 1, for example 1.3, continuously to one Value reduced below 1.
- This results in one of the Ionization electrode (4) derived course of Measuring voltage (ionization voltage Ui) at the output of the Low pass (8), as in one of the curves I, II, III in Fig. 2 is shown as an example.
- Which of the curves depends on the condition of the ionization electrode (4) or the gas burner (1); so it depends like the ionization electrode (4) in the connection area of the Burner flames. For example, bent, worn or sooty ionization electrode (4) a different voltage curve than in "good condition.
- the detection circuit (23) detects the respective Voltage maximum A, B, C, for example by the Evaluates slope of curve I, II or III.
- the respective Maximum voltage is in the memory circuit (24) filed.
- the memory circuit (24) represents the basic value (100%) of the setpoint device (11) to this value.
- the characteristic curve results in a calibration cycle (II) with the maximum value (B), which is the consequence of a Change in state of the ionization electrode (4), then is this voltage value (B) in the memory circuit (24) saved as the basic value for the setpoint generator (11).
- the Setpoint generator (11) remains at 90% of a basic value set, which shows b in Fig.2. From Fig.2 is it can be seen that the voltage (b) (90% of the Maximum voltage B) across the comparator (10) if control after the calibration cycle using the Switch (13) is switched on again, a regulation to the Lambda setpoint of 1.2.
- the calibration cycles are compared to the times in which the gas burner (1) in normal control operation works, very short, so that during the Calibration cycles with one of the Lambda setpoint deviating lambda value combustion occurring in purchase can be taken. In each case to one Calibration process subsequent regular operation the combustion improves.
- the calibration is the one described Control function switched off.
- the calibration is done preferably at a constant speed of the Blower (2) to the influence of the blower (2) on the To suppress combustion. It is cheap Perform calibration at medium speed, to avoid modulation limits during calibration of the control signal (J) which is sent to the gas solenoid valve (3 ') is laid to bump.
- the calibration can also be done during switching the blower (2) from one Performance level to the other performance level because the speed change compared to the calibration process is slow so that the speed during the Calibration process is quasi constant.
- the calibration process is carried out at time (t1) (see Fig. 3) from the event or operating hours counter during the transition from the full load level to the partial load level of the blower (2) started when the decreasing modulation current (J) reached a low value (Jk). It is then from the Control circuit (9) of the modulation current (J) and thus over the gas solenoid valve (3 ') increases the gas supply, causing the Ionization voltage (Ui) increases accordingly. To the At time (t2) the ionization voltage (Ui) reaches one predetermined value, for example 0.9 Uimax.
- the Time period (t1 to t2) serves to start the preheating the ionization electrode (4). From the time (t2) until the time (t3) the modulation current (J) remains constant held. During this period (t2 to t3) it heats up the ionization electrode (4) to a stable temperature and thereby guarantees reproducible measured values.
- the modulation current (J) is increased further until the Ionization voltage (Ui) again about 10% below that Uimax value is what in Figure 3 at time (t4) Case is.
- the lambda value is in the period (t3 to t4) the incineration itself is unfavorable, but this does not ins Weight drops because this time span is at most a few Takes seconds.
- the control circuit (9) switches back to the control process described above. This starts when the (t5) Ionization voltage (Ui), the modulation current (J) and the Have stabilized gas pressure (p).
- the control circuit (9) conducts the measured values obtained. a correspondingly adjusted new setpoint for the Ionization voltage.
- Control circuit (9) will also change in the period (t3 to t4) result in a series of measured values. Compared to the other measured values of the series strongly differing measured values are suppressed because they rely on external electrical Interference may be based.
- the first transfer criterion covers a sudden one Change all components of the control loop. It is fulfilled if the deviation of the new calibration value is sufficiently small from the previous calibration values.
- the second handover criterion records a "creeping Drift "of the system (burner control), which in the event of deviation sufficient from the values provided by the manufacturer is small.
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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)
- Control Of Combustion (AREA)
Claims (7)
- Procédé de régulation d'un brûleur à gaz, en particulier un brûleur à gaz à air soufflé, avec une électrode de mesure, en particulier une électrode à ionisation, qui applique une grandeur électrique dérivée de la température de combustion, respectivement de la valeur lambda, à un circuit de régulation, qui compare cette grandeur à une valeur de consigne électrique sélectionnée et qui règle le rapport air-gaz à une valeur de consigne lambda correspondante,
caractérisé en ce que,
après écoulement d'un certain temps de fonctionnement ou bien à des intervalles réguliers est obligatoirement effectué un cycle d'étalonnage, dans lequel la valeur lambda est réduite, en partant d'une valeur > 1, et dans lequel la grandeur électrique résultante (signal d'ionisation) est mesurée et sa valeur maximale (A, B, C) est mémorisée, et en ce que, avec cette valeur maximale, on procède à une reprise de réglage de la valeur de consigne électrique, afin que le circuit de régulation soit réglé à la même valeur de consigne lambda. - Procédé selon la revendication 1, caractérisé en ce qu'un cycle d'étalonnage est chaque fois lancé après un nombre déterminé d'heures de fonctionnement ou de mise en service du brûleur à gaz.
- Procédé selon la revendication 1 ou 2, caractérisé en ce qu'ensuite, lorsque la valeur maximale (A, B, C) est située hors d'une plage (F) prédéterminée, un signal de défaut est produit.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que, dans le cycle d'étalonnage, la valeur lambda est passée d'une valeur > 1 à une valeur inférieure à 1.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que, dans le cycle d'étalonnage, la valeur lambda > 1 est au moins de valeur égale à la valeur de consigne lambda réglable.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que, dans chaque cycle d'étalonnage, le signal de commande (J) pour une électrovanne à gaz (3') est d'abord placé à une valeur convenant pour un préchauffage de l'électrode d'ionisation (4), puis le signal de commande (J) étant amplifié jusqu'à ce que la valeur maximale du signal d'ionisation (Ui) soit franchie et que la valeur résultante soit exploitée pour procéder à l'étalonnage.
- Circuit de régulation d'un brûleur à gaz, en particulier d'un brûleur à gaz à air soufflé avec une électrode de mesure, en particulier une électrode d'ionisation, qui applique une grandeur de mesure électrique correspondant à la température de combustion, respectivement la valeur lambda, au circuit de régulation, dans le circuit de régulation étant prévu un comparateur (10) qui compare la grandeur de mesure électrique respective à l'aide d'un transducteur de valeur de consigne (11) et qui règle le rapport air-gaz à une valeur de consigne lambda,
caractérisé en ce qu'
un commutateur (13) interrompt le fonctionnement de la régulation et un générateur de rampe (22) réduit le rapport air-gaz en partant d'une valeur lambda > 1, la grandeur de mesure électrique (U) suivant une courbe (I, II, III), et en ce qu'un circuit d'identification et de mémorisation (23, 24) appréhende et mémorise la valeur de la grandeur de mesure au maximum (A, B, C) de la courbe (I, II, III) et ajuste le transducteur de valeur de consigne (11) pour cette valeur prise comme valeur de base.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19539568 | 1995-10-25 | ||
DE19539568A DE19539568C1 (de) | 1995-10-25 | 1995-10-25 | Verfahren und Schaltung zur Regelung eines Gasbrenners |
DE19618573 | 1996-05-09 | ||
DE19618573A DE19618573C1 (de) | 1996-05-09 | 1996-05-09 | Verfahren und Einrichtung zum Betrieb eines Gasbrenners |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0770824A2 EP0770824A2 (fr) | 1997-05-02 |
EP0770824A3 EP0770824A3 (fr) | 1998-04-15 |
EP0770824B1 true EP0770824B1 (fr) | 2000-01-26 |
Family
ID=26019737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96115721A Expired - Lifetime EP0770824B1 (fr) | 1995-10-25 | 1996-10-01 | Procédé et circuit pour commander un brûleur à gaz |
Country Status (5)
Country | Link |
---|---|
US (1) | US5924859A (fr) |
EP (1) | EP0770824B1 (fr) |
AT (1) | ATE189301T1 (fr) |
CA (1) | CA2188616C (fr) |
DE (1) | DE59604283D1 (fr) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1002997A2 (fr) * | 1998-11-20 | 2000-05-24 | G. Kromschröder Aktiengesellschaft | Procédé pour commander le rapport d'air / carburant d'un brûleur à gaz prémélangé complet |
EP1331444A2 (fr) | 2002-01-17 | 2003-07-30 | Vaillant GmbH | Méthode de régulation d'un brûleur à gaz |
EP1522790A2 (fr) | 2003-10-08 | 2005-04-13 | Vaillant GmbH | Procédé de régulation d'un brûleur à gaz, en particulier dans des installations de chauffe avec ventilateur |
DE102004055716A1 (de) * | 2004-06-23 | 2006-01-12 | Ebm-Papst Landshut Gmbh | Verfahren zur Regelung und Steuerung einer Feuerungseinrichtung und Feuerungseinrichtung |
EP2014985A2 (fr) | 2007-07-13 | 2009-01-14 | Vaillant GmbH | Procédé de réglage du rapport air/carburant d'un brûleur fonctionnant au gaz |
DE102010008908A1 (de) * | 2010-02-23 | 2011-08-25 | Robert Bosch GmbH, 70469 | Verfahren zum Betreiben eines Brenners und zum Luftzahl-geregelten Modulieren einer Brennerleistung |
DE10300602B4 (de) * | 2002-01-17 | 2012-01-05 | Vaillant Gmbh | Verfahren zur Regelung eines Gasbrenners |
EP2405198A1 (fr) | 2010-07-08 | 2012-01-11 | Vaillant GmbH | Procédé de calibration de régulation du rapport gaz combustible-air d'un brûleur à gaz combustible |
DE102010055567A1 (de) * | 2010-12-21 | 2012-06-21 | Robert Bosch Gmbh | Verfahren zur Stabilisierung eines Betriebsverhaltens eines Gasgebläsebrenners |
DE102013214610A1 (de) * | 2013-07-26 | 2015-01-29 | E.On New Build & Technology Gmbh | Verfahren und Vorrichtung zur Bestimmung von Kennwerten von Brenngasen |
DE102019119186A1 (de) | 2019-01-29 | 2020-07-30 | Vaillant Gmbh | Verfahren und Vorrichtung zur Regelung eines Brenngas-Luft-Gemisches in einem Heizgerät |
EP3690318A2 (fr) | 2019-01-29 | 2020-08-05 | Vaillant GmbH | Procédé et dispositif de régulation d'un mélange air-gaz de combustion dans un appareil de chauffage |
EP3712501A1 (fr) | 2019-03-22 | 2020-09-23 | Vaillant GmbH | Procédé et dispositif de régénération d'une électrode pour une mesure d'ionisation dans une zone de flamme d'un brûleur |
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WO2020228979A1 (fr) | 2019-05-16 | 2020-11-19 | Truma Gerätetechnik GmbH & Co. KG | Procédé de surveillance d'un brûleur et/ou d'un comportement de combustion d'un brûleur ainsi qu'ensemble de brûleur |
EP3767174A1 (fr) | 2019-07-16 | 2021-01-20 | Vaillant GmbH | Procédé et dispositif d'étalonnage ultérieur d'un système de mesure permettant de réguler un mélange gaz-air de combustion dans un appareil de chauffage |
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IT202100032360A1 (it) | 2021-12-23 | 2023-06-23 | Sit Spa | Metodo e apparato per il monitoraggio e controllo della combustione in apparecchi bruciatori a gas combustibile |
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- 1996-10-01 AT AT96115721T patent/ATE189301T1/de active
- 1996-10-01 DE DE59604283T patent/DE59604283D1/de not_active Expired - Lifetime
- 1996-10-01 EP EP96115721A patent/EP0770824B1/fr not_active Expired - Lifetime
- 1996-10-23 CA CA002188616A patent/CA2188616C/fr not_active Expired - Lifetime
- 1996-10-24 US US08/736,077 patent/US5924859A/en not_active Expired - Lifetime
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EP1331444A2 (fr) | 2002-01-17 | 2003-07-30 | Vaillant GmbH | Méthode de régulation d'un brûleur à gaz |
AT411189B (de) * | 2002-01-17 | 2003-10-27 | Vaillant Gmbh | Verfahren zur regelung eines gasbrenners |
EP1522790A2 (fr) | 2003-10-08 | 2005-04-13 | Vaillant GmbH | Procédé de régulation d'un brûleur à gaz, en particulier dans des installations de chauffe avec ventilateur |
US8636501B2 (en) | 2004-06-23 | 2014-01-28 | Landshut GmbH | Method for regulating and controlling a firing device and firing device |
EP2594848A1 (fr) | 2004-06-23 | 2013-05-22 | ebm-papst Landshut GmbH | Procédé de commande d'un appareil à combustion et appareil à combustion |
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Also Published As
Publication number | Publication date |
---|---|
CA2188616C (fr) | 2001-01-09 |
DE59604283D1 (de) | 2000-03-02 |
ATE189301T1 (de) | 2000-02-15 |
US5924859A (en) | 1999-07-20 |
EP0770824A3 (fr) | 1998-04-15 |
CA2188616A1 (fr) | 1997-04-26 |
EP0770824A2 (fr) | 1997-05-02 |
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