EP1351019A2 - Verfahren zur Uberprüfung der Funktion eines Steuerungs-/Regelungssystems eines Heizungsbrenners - Google Patents
Verfahren zur Uberprüfung der Funktion eines Steuerungs-/Regelungssystems eines Heizungsbrenners Download PDFInfo
- Publication number
- EP1351019A2 EP1351019A2 EP03005702A EP03005702A EP1351019A2 EP 1351019 A2 EP1351019 A2 EP 1351019A2 EP 03005702 A EP03005702 A EP 03005702A EP 03005702 A EP03005702 A EP 03005702A EP 1351019 A2 EP1351019 A2 EP 1351019A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure switch
- air
- fuel
- blower
- signal
- 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
Links
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Classifications
-
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/06—Regulating fuel supply conjointly with draught
- F23N1/062—Regulating fuel supply conjointly with draught 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
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/10—Fail safe for component failures
-
- 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
Definitions
- the invention relates to a method according to the preamble of claim 1 and one Device for performing the method.
- Atmospheric gas burners with no air ratio adjustment are generally for the designed intermittent operation, the sizes of the fuel and Air flow determined as a function of a power request signal that the desired service is provided.
- the Power request signal can be, for example, from a temperature controller be generated.
- the air volume flow provided for the combustion is here generally not continuously updated, i.e. that the amount of air is approximately is constant and is normally designed for the maximum burner output.
- the air volume flow can, for example, by means of a Pressure switch are monitored.
- the pressure switch can be parallel to one Air resistance can be switched in the air duct.
- the pressure switch measures that Pressure difference across the air resistance and thus the air flow in the duct.
- the Pressure switch thus functions as an air flow tester, whose contacts sufficient air flow are closed. It is important that the Pressure switch works reliably and fail-safe.
- the air volume flow becomes the Track the amount of fuel so that there is optimal combustion can the influencing of the air volume flow by an actuator e.g. by means of a Air flap or by varying the speed of an exhaust gas or fresh air blower respectively.
- External influences can also occur with such burners, for example due to contamination, corrosion or a foreign body in the exhaust duct Air volume flow and thus falsify the required performance and air ratio.
- Controlling or regulating the fan speed can only cause such external influences be compensated conditionally. Therefore, monitoring the actual To prefer air volume flow.
- the document DE-A1-4429157 shows the monitoring of a generally usable Regulation.
- the signal change of the control sensor as a result of controlled, controlled change of an actuator in the control loop.
- EP-A-909922 discloses a combustion chamber with one therein located air pressure sensor, the signal of which is a measure of the ventilation.
- the sensor signal becomes a target signal regulated by a higher-level flame quality control by means of measurement is generated at an ionization electrode. If the sensor signal is due to External influences or drift phenomena become inaccurate in the long term, that could be Flame quality control based on the ionization electrode the resulting Determine deviation of the air ratio and the target signal according to a Adjust optimization of flame quality.
- the settings of the Flame quality control indirectly depend on the sensor signal again, whereby possible external influences still to a certain extent the flame quality and Air flow.
- the invention is therefore based on the object without monitoring the Flame signal or the fan speed, a reliable and accurate Check the function of the control system at one To allow heating burners.
- the method according to the invention is based on the Actual burner activation to put the air control loop into operation in which a Control setpoint is given that is at least the maximum value or above Maximum value of the normal operating range of the burner is. That then itself setting control result, e.g. the resulting volume flow rate queried by means of a differential pressure switch and regarding its correctness rated. Only when this check has taken place is the burner for the Normal operation released.
- all components of the control loop can in a simple manner when the burner starts up with regard to its perfect function be checked.
- the phase control of the Blower, the blower itself, the pressure sensor, the modulator stage for example executed as a gas actuator and called the pressure switch.
- the Switch-off point of the pressure switch is preferably above the chimney draft maximum air volume flow. Because the Air volume flow monitoring by a parallel to the pressure sensor switched pressure switch takes place, the monitoring of the air volume flow in simple way, i.e. without the need for a speed signal or a flame signal will be done.
- the pressure switch is working properly by pressing the Rest position (pressure switch switched off) is determined before the air control loop, i.e. the fan is switched on. If the pressure switch is not in the rest position the fan is not switched on and the burner remains out of operation.
- the only figure shows schematically an atmospheric gas burner with a Combustion chamber 1, in which a fan 2 is arranged.
- An air control signal 3 controls and influences the speed of the fan drive via an air actuator 4 thus the air volume flow in an exhaust duct 5.
- Air resistance 6 e.g. available in the form of a throttle element, as well as upstream or downstream of the throttle element, pressure tapping points are provided, which with a pressure sensor 8 and an air flow tester, for example in the form of a Pressure switch 7, which is connected in parallel to the pressure sensor 8, are connected.
- the pressure switch 7 generates an air test signal 9 and the pressure sensor 8 on Air sensor signal 10.
- the air test signal 9 and the air sensor signal 10 become one Control device 11 supplied, which the air control signal 3 for the blower 2 and generates a fuel control signal 12 for the fuel actuator 14.
- the Fuel actuator 14 controls the fuel flow in a gas line 13 by means of a modulated gas valve 15.
- the control device 11 can generate an enable signal 16, which is a Safety valve 17 in gas line 13 opens.
- the control device 11 generates the release signal 16, for example by means of a Safety device 21 which e.g. in a burner control, not shown can be included.
- the monitoring of the air volume flow according to the invention takes place each time the burner is started.
- the safety device 21 before the fuel is released, the safety device 21 generates a control setpoint 23, which is, for example, 120% of the maximum air volume flow in normal operation of the burner. If the air control circuit is functioning correctly and the ventilation is not faulty, the pressure switch 7 will now close due to the pressure drop across the air resistance 6. In the meantime, the safety device 21 compares the air test signal 9 with a reference value which corresponds to the closed state of the pressure switch 7. If the pressure switch is closed or switched on, this is detected by the safety device 21, with which the test is completed and the burner can be released for operation.
- the safety device 21 can be closed after the Pressure switch 7 monitor whether the pressure switch 7 during the subsequent Shutting down the speed of the blower 2 opens again. This also allows the Function of the pressure switch can be checked.
- the control device 11 only starts an ignition process for starting the burner if the above-mentioned processes run without errors.
- the gas line 13 is released for a fuel flow.
- the function test is preferably carried out before normal operation, ie before valve 17 is opened and only when the function test has been completed without errors, fuel valve 17 is then opened and the burner can then be brought into normal operation.
- a power request signal 20 which can originate, for example, from a higher-level temperature controller, causes the safety device 21 to open the gas valve 15 accordingly via the fuel control signal 12.
- the safety device 21 provides an air target signal 23 via a correspondingly stored characteristic curve 22.
- the target air signal 23 is fed to an air regulator 24, which then regulates the air sensor signal 10 by generating the air control signal 3.
- the air regulator 24 can, for example, carry out a PI / PID control.
- a pump 18 then transports this during normal operation of the burner heating water arranged in the combustion chamber 1 Heat exchanger 19.
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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)
Abstract
Description
Bei einem fehlerfrei funktionierenden Luftregelkreis und störungsfreier Durchlüftung wird jetzt der Druckschalter 7 wegen des Druckabfalls über dem Luftwiderstand 6 schliessen. Währenddessen vergleicht die Sicherheitseinrichtung 21 das Luftprüfungssignal 9 mit einem Referenzwert, der dem geschlossenen Zustand des Druckschalters 7 entspricht. Wenn der Druckschalter geschlossen bzw. eingeschaltet ist, wird dies durch die Sicherheitseinrichtung 21 erfasst, womit die Prüfung abgeschlossen ist und der Brenner zum Betrieb freigegeben werden kann.
Vorzugsweise erfolgt der Funktionstest vor dem Normalbetrieb, d.h. vor Öffnen des Ventils 17 und nur wenn der Funktionstest fehlerfrei abgeschlossen ist wird dann das Brennstoffventil 17 geöffnet, und der Brenner kann dann in den Normalbetrieb gefahren werden.
Das Luftsollsignal 23 wird einem Luftregler 24 zugeführt, der durch Erzeugung des Luftstellsignals 3 das Luftsensorsignal 10 daraufhin abregelt. Der Luftregler 24 kann beispielsweise eine PI-/PID-Regelung ausführen.
Claims (6)
- Verfahren zur Funktionsüberprüfung eines Steuerungs-/Regelungssystems eines Heizungsbrenners mit einer Verbrennungskammer (1), die über ein steuerbares Gebläse (2) mit einem Luftkanal (5) verbunden ist, wobei im Normalbetrieb die Verbrennungskammer (1) über ein steuerbares Brennstoffstellglied (14) mit Brennstoff versorgt wird und mit einem Differenzdrucksensor (8) und einem dazu parallel geschalteten Druckschalter (7), wobei der Differenzdrucksensor (8) ein Luftsensorsignal (10) und der Druckschalter (7) ein Luftprüfungssignal (9) erzeugt, die einer elektronischen Regeleinrichtung (11) zugeführt werden, die daraus ein Luftstellsignal (3) für das Gebläse und ein Brennstoffstellsignal (12) zur Betätigung des Brennstoffstellgliedes (14) erzeugt, dadurch gekennzeichnet, dass die Funktionsüberprüfung dadurch erfolgt, dass die Regeleinrichtung (11) mit einem Regelsollwert beaufschlagt wird, der wenigstens dem beim Normalbetrieb sich einstellenden maximalen Luftvolumenstrom entspricht oder grösser als der maximale Luftvolumenstrom ist, und dass der in einer Ruhestellung befindliche Druckschalter (7) daraufhin überwacht wird, ob dieser geschaltet hat und dass die Freigabe des Brennstoffstellgliedes (14) erst nach dem Schalten des Druckschalters (7) erfolgt, wodurch der Brenner in Betrieb genommen werden kann.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor Inbetriebnahme des Gebläses (2) durch eine Sicherheitseinrichtung (21) überprüft wird, ob der Druckschalter (7) sich in seiner Ruhestellung befindet und nach Inbetriebnahme des Gebläses die Sicherheitseinrichtung (21) eine Rückmeldung abgibt, ob der Druckschalter (7) in die Arbeitsstellung geschaltet hat.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Sicherheitseinrichtung (21) bei fehlerfreiem Ablauf der Prüfvorgänge ein Freigabesignal (16) erzeugt, wodurch ein Sicherheitsventil (17) den Brennstoff für den Brenner freigegibt.
- Vorrichtung zur Durchführung des Verfahrens gemäss Anspruch 1 bis 3 mit einem Luftstellglied (4) mittels dem die Drehzahl eines Gebläses (2) gesteuert wird, wobei das Gebläse (2) mit einem Luftkanal (5) verbunden ist und einem Brennstoffstellglied (14), mittels dem im Normalbetrieb die Brennstoffzufuhr zu einer Verbrennungskammer (1) gesteuert wird und dass der Luftkanal (5) mit einem Differenzdrucksensor (8) und einem dazu parallel geschalteten Druckschalter (7) verbunden ist, wobei der Differenzdrucksensor (8) ein Luftsensorsignal (10) und der Druckschalter (7) ein Luftprüfungssignal (9) erzeugt, die einer elektronischen Regeleinrichtung (11) zugeführt werden, die daraus ein Luftstellsignal (3) für das Gebläse (2) und ein Brennstoffstellsignal (12) zur Betätigung des Brennstoffstellgliedes (14) erzeugen, dadurch gekennzeichnet, dass zur Funktionsüberprüfung die Regeleinrichtung (11) mit einem Regelsollwert beaufschlagt wird, der wenigstens dem bei Normalbetrieb sich einstellenden Maximalvolumenstrom entspricht oder grösser als dieser ist, und dass der in einer Ruhestellung sich befindliche Druckschalter (7) daraufhin überwacht wird, ob dieser geschaltet hat und dass die Freigabe des Brennstoffstellgliedes (14) erst nach dem Schalten des Druckschalters (7) erfolgt, wodurch der Brenner in Betrieb genommen werden kann.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass vor Inbetriebnahme des Gebläses (2) durch eine Sicherheitseinrichtung (21) überprüft wird, ob der Druckschalter (7) sich in seiner Ruhestellung befindet und nach Inbetriebnahme des Gebläses die Sicherheitseinrichtung (21) eine Rückmeldung abgibt,ob der Druckschalter (7) geschaltet hat.
- Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Sicherheitseinrichtung (21) bei fehlerfreiem Ablauf der Prüfvorgänge ein Freigabesignal (16) erzeugt, wodurch ein Sicherheitsventil (17) den Brennstoff für den Brenner freigibt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH5402002 | 2002-04-02 | ||
CH5402002 | 2002-04-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1351019A2 true EP1351019A2 (de) | 2003-10-08 |
EP1351019A3 EP1351019A3 (de) | 2005-03-16 |
EP1351019B1 EP1351019B1 (de) | 2013-07-17 |
Family
ID=27810658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03005702.0A Expired - Lifetime EP1351019B1 (de) | 2002-04-02 | 2003-03-13 | Verfahren zur Uberprüfung der Funktion eines Steuerungs-/Regelungssystems eines Heizungsbrenners |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1351019B1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006044408A1 (en) * | 2004-10-14 | 2006-04-27 | Shell Internationale Research Maatschappij B.V. | A method and apparatus for monitoring and controlling the stability of a burner of a fired heater |
EP1712841A1 (de) * | 2005-04-14 | 2006-10-18 | Immergas S.p.A. | Elektronisches Gerät und Verfahren zur Steuerung des Gasabzuges, insbesondere in einem Kessel |
DE102010054807A1 (de) * | 2010-12-16 | 2012-06-21 | Honeywell Technologies Sarl | Gasbrennervorrichtung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4429157A1 (de) | 1994-08-17 | 1996-02-22 | Kromschroeder Ag G | Verfahren zur Funktionsüberwachung eines Steuer- und Regelsystems |
EP0909922A1 (de) | 1997-10-17 | 1999-04-21 | IABER S.p.A. | Kombiniertes Regelsystem für Gas und Luft zur Verbrennungsregelung eines Gasheizkessels |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4334855A (en) * | 1980-07-21 | 1982-06-15 | Honeywell Inc. | Furnace control using induced draft blower and exhaust gas differential pressure sensing |
FR2552859A1 (fr) * | 1983-10-03 | 1985-04-05 | Vaillant Sarl | Dispositif de mise en marche pour une source de chaleur marchant au gaz |
US4992040A (en) * | 1990-03-19 | 1991-02-12 | Honeywell Inc. | Airflow switch checking circuit |
CA2212499A1 (en) * | 1995-02-16 | 1996-08-22 | British Gas Plc | Controlling a combustion system |
ATE350625T1 (de) * | 2000-03-03 | 2007-01-15 | Riello Spa | Regelanlage für kessel |
-
2003
- 2003-03-13 EP EP03005702.0A patent/EP1351019B1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4429157A1 (de) | 1994-08-17 | 1996-02-22 | Kromschroeder Ag G | Verfahren zur Funktionsüberwachung eines Steuer- und Regelsystems |
EP0909922A1 (de) | 1997-10-17 | 1999-04-21 | IABER S.p.A. | Kombiniertes Regelsystem für Gas und Luft zur Verbrennungsregelung eines Gasheizkessels |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006044408A1 (en) * | 2004-10-14 | 2006-04-27 | Shell Internationale Research Maatschappij B.V. | A method and apparatus for monitoring and controlling the stability of a burner of a fired heater |
US7950919B2 (en) | 2004-10-14 | 2011-05-31 | Shell Oil Company | Method and apparatus for monitoring and controlling the stability of a burner of a fired heater |
EP1712841A1 (de) * | 2005-04-14 | 2006-10-18 | Immergas S.p.A. | Elektronisches Gerät und Verfahren zur Steuerung des Gasabzuges, insbesondere in einem Kessel |
DE102010054807A1 (de) * | 2010-12-16 | 2012-06-21 | Honeywell Technologies Sarl | Gasbrennervorrichtung |
DE102010054807B4 (de) * | 2010-12-16 | 2015-07-02 | Honeywell Technologies Sarl | Verfahren zum Betreiben einer Gasbrennervorrichtung |
Also Published As
Publication number | Publication date |
---|---|
EP1351019B1 (de) | 2013-07-17 |
EP1351019A3 (de) | 2005-03-16 |
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