EP1944550B1 - Method for controlling a gas burner - Google Patents
Method for controlling a gas burner Download PDFInfo
- Publication number
- EP1944550B1 EP1944550B1 EP07025166.5A EP07025166A EP1944550B1 EP 1944550 B1 EP1944550 B1 EP 1944550B1 EP 07025166 A EP07025166 A EP 07025166A EP 1944550 B1 EP1944550 B1 EP 1944550B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- gas
- limit value
- gas burner
- combustion air
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000011109 contamination Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 description 55
- 238000005259 measurement Methods 0.000 description 6
- 239000013256 coordination polymer Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—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
- 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
- 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
- F23N2227/00—Ignition or checking
- F23N2227/12—Burner simulation or checking
- F23N2227/16—Checking components, e.g. electronic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/24—Controlling height of burner
- F23N2237/26—Controlling height of burner oxygen-air ratio
Definitions
- the invention relates to a method for controlling a gas burner according to the preamble of claim 1.
- a method for controlling a gas burner wherein a gas burner via a gas line, a gas stream and a combustion air line, a combustion air flow is supplied.
- the gas line is a gas valve and the combustion air line is associated with a fan, wherein a sensor that provides an electrical or electronic measurement signal, on the one hand on the combustion air line and on the other hand engages the gas line.
- the gas burner is controlled in the sense of a 1: 1 gas / air control such that the gas flow supplied to the gas burner is about the same size as the combustion gas supplied to the gas burner, in which case the sensor is not flowed through, a flow through the Sensor is thus about zero.
- the structure of the sensor which is used to control the gas burner, is from the DE 100 56 064 A1
- the sensor has a heating device positioned between two temperature-sensitive measuring devices. With active control, the heating device of the sensor is turned on, so that when the sensor is flowed through, depending on the flow direction of a measuring device is heated by the heater more than the other measuring device.
- After DE 100 56 064 A1 It is also proposed to turn off the heater of the sensor to perform a sensor safety check with the gas valve closed and the fan off so as to eliminate the effect of natural flow on the sensor safety check.
- the invention is based on the problem to provide a novel method for controlling a gas burner, with which a contamination-induced sensor drift can be detected.
- This problem is solved by a method for controlling a gas burner with the features of claim 1.
- assemblies of the sensor are designed such that measuring devices of the sensor are subject to self-heating, and that to check whether a pollutant caused by sensor drift, the Edaufloomung the measuring devices is exploited such that when active control, ie with open gas valve and fan running if the flow through the sensor is approximately zero, a heating device associated with the sensor is switched off for a defined period of time, wherein if the measured value determined under these conditions when the heating device is switched off is outside a tolerance range corresponding to the measured value determined when the heating device is switched off, an inadmissible contamination of the sensor is closed.
- a contamination-related sensor drift can be reliably detected.
- the present invention relates to a method for controlling a gas burner, wherein the gas burner to be controlled, a gas / air mixture is supplied.
- a gas stream can be fed to the gas burner via a gas line 10, at least one gas valve 11 being integrated into the gas line 10.
- the gas line 10 opens into a combustion air line 12, via which a combustion air flow is supplied to the gas burner.
- the combustion air line 12 is associated with a blower 13.
- the rotational speed of the blower 13 determines the combustion air flow.
- a throttle point 14 is arranged, wherein the gas line 10 downstream of the throttle point 14 opens into the combustion air line 12.
- a gas nozzle 15 closes off the gas line 10 in the region of the combustion air line 12. In the flow direction behind the gas nozzle 15 is therefore present in front of a gas / air mixture.
- a sensor 16 which engages with a measuring point 17 on the gas line and with a further measuring point 18 on the combustion air line.
- the sensor 16 is designed as a flowmeter or anemometer and flows depending on the flow conditions or pressure conditions in the gas line 10 and combustion air line 12. The detailed structure of the sensor 16 results from Fig. 2 ,
- the sensor 16 generates depending on the flow through an electrical or electronic measurement signal 19, which is supplied to a control unit 20.
- the control unit 20 compares the actual value provided by the sensor with a setpoint value, wherein an actuating signal 21 for an actuator 22 assigned to the gas valve 11 is generated as a function thereof.
- the gas valve 11 is opened via the actuator 22 such that the gas flow corresponds to the combustion air flow, so that no flow flows through the sensor 16.
- the sensor 16 has according to Fig. 2 via a heating device 23 which is arranged between two temperature-sensitive measuring devices 24, 25.
- the two temperature-sensitive measuring devices 24, 25 are preferably designed as PTC elements, wherein the measuring devices 24 and 25 are coupled via resistance elements 27 and 28 to a power supply.
- the signals provided by the temperature-sensitive measuring devices 24 and 25 are supplied to an amplifier 26, the amplifier 26 finally providing the electrical or electronic measuring signal 19 of the sensor 16.
- either the measuring device 24 or the measuring device 25 is heated more when the heating device 23 is switched on.
- the assemblies 24, 25, 27 and 28 of the sensor 16 are designed such that the measuring devices 24 and 25 of the sensor 16 are subject to self-heating. To check whether there is a soiling-caused sensor drift of the sensor 16, the self-heating of the measuring devices 24 and 25 is exploited such that with active control, so with open gas valve 11 and running fan 13, the sensor 16 associated heater 23 at defined intervals for a is turned off. A measured value determined in this case is used as a new control point for 1: 1 gas / air control, in which case if the measured value of the sensor 16 present in the new control point is greater than an upper limit value or less than a lower limit value, this indicates impermissible contamination the sensor 16 is closed.
- FIG. 3 and 4 illustrate the method of the invention.
- Fig. 3, 4 in each case a diagram in which on the horizontally extending axis the flow ⁇ through the sensor 16 and on the vertical axis, the measurement signal U of the sensor 16 is plotted.
- the measurement signal U corresponds to the measurement signal 19.
- a curve 29 or 29 ' shows the measuring signal U of the sensor 16 as a function of the flow rate ⁇ with the heater 23 of the sensor 16 switched off.
- a curve 30 or 30' shows the measuring signal U of the sensor 16 as a function of the flow rate ⁇ when the heating device is switched on 23.
- the two curves 29 and 30 of Fig. 3 correspond to the behavior of a new or new sensor 16.
- the two curves 29 'and 30' of Fig. 4 correspond to the behavior of an older polluted sensor 16.
- a measured value determined in this case is used as a new control point for the 1: 1 gas / air control, whereby a convergent process leads to a new control point for the control of the gas burner.
- Fig. 3 shows the control point CP for a new or as new as well as non-dirty sensor.
- Fig. 4 shows the control point CP 'formed by the converging process in an aged, polluted sensor. The control points CP and CP 'lie respectively at the intersection or intersection of the curves 29 and 30 or the curves 29' and 30 '.
- the gas burner is preferably deactivated and / or a warning message is generated to cause maintenance of the gas burner or sensor 16.
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)
Description
Die Erfindung betrifft ein Verfahren zum Regeln eines Gasbrenners nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for controlling a gas burner according to the preamble of claim 1.
Aus der
Der Aufbau des Sensors, der zum Regeln des Gasbrenners verwendet wird, ist aus der
Weiter Stand der Technik ist aus der
Hiervon ausgehend liegt der Erfindung das Problem zu Grunde, ein neuartiges Verfahren zum Regeln eines Gasbrenners zu schaffen, mit welchem ein verschmutzungsbedingter Sensordrift detektierbar ist. Dieses Problem wird durch ein Verfahren zum Regeln eines Gasbrenners mit den Merkmalen des Anspruchs 1 gelöst. Erfindungsgemäß sind Baugruppen des Sensors derart ausgelegt, dass Messeinrichtungen des Sensors einer Selbstaufheizung unterliegen, und dass zur Überprüfung, ob ein verschmutzungsbedingter Sensordrift vorliegt, die Selbstaufheizung der Messeinrichtungen derart ausgenutzt wird, dass dann, wenn bei aktiver Regelung, also bei geöffnetem Gasventil und laufendem Gebläse, der Durchfluss durch den Sensor in etwa Null beträgt, eine dem Sensor zugeordnete Heizeinrichtung für einen definierten Zeitraum ausgeschaltet wird, wobei dann, wenn der unter diesen Bedingungen bei eingeschalteter Heizeinrichtung ermittelte Messwert außerhalb eines Toleranzbereichs um den bei ausgeschalteter Heizeinrichtung ermittelten, korrespondierenden Messwert liegt, auf eine unzulässige Verschmutzung des Sensors geschlossen wird. Mit dem erfindungsgemäßen Verfahren kann ein verschmutzungsbedingter Sensordrift sicher detektiert werden.On this basis, the invention is based on the problem to provide a novel method for controlling a gas burner, with which a contamination-induced sensor drift can be detected. This problem is solved by a method for controlling a gas burner with the features of claim 1. According to the invention assemblies of the sensor are designed such that measuring devices of the sensor are subject to self-heating, and that to check whether a pollutant caused by sensor drift, the Selbstaufheizung the measuring devices is exploited such that when active control, ie with open gas valve and fan running if the flow through the sensor is approximately zero, a heating device associated with the sensor is switched off for a defined period of time, wherein if the measured value determined under these conditions when the heating device is switched off is outside a tolerance range corresponding to the measured value determined when the heating device is switched off, an inadmissible contamination of the sensor is closed. With the method according to the invention, a contamination-related sensor drift can be reliably detected.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Nachfolgend wird ein Ausführungsbeispiel der Erfindung, ohne hierauf beschränkt zu sein, anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:
- Fig. 1:
- eine Vorrichtung zum Regeln eine Gasbrenners in schematisierter Darstellung;
- Fig. 2:
- den Sensor der Vorrichtung der
Fig. 1 in detaillierter Darstellung; - Fig. 3:
- ein Diagramm zur Verdeutlichung des erfindungsgemäßen Verfahrens zum Regeln eines Gasbrenners; und
- Fig. 4:
- ein weiteres Diagramm zur Verdeutlichung des erfindungsgemäßen Verfahrens zum Regeln eines Gasbrenners.
- Fig. 1:
- a device for controlling a gas burner in a schematic representation;
- Fig. 2:
- the sensor of the device
Fig. 1 in a detailed representation; - 3:
- a diagram illustrating the method according to the invention for controlling a gas burner; and
- 4:
- a further diagram to illustrate the method for controlling a gas burner according to the invention.
Die hier vorliegende Erfindung betrifft ein Verfahren zur Regelung eines Gasbrenners, wobei dem zu regelnden Gasbrenner ein Gas/Luft-Gemisch zugeführt wird. Zur Bereitstellung des dem Gasbrenner zuzuführenden Gas/Luft-Gemisches ist dem Gasbrenner über eine Gasleitung 10 ein Gasstrom zuführbar, wobei in die Gasleitung 10 mindestens ein Gasventil 11 integriert ist. Die Gasleitung 10 mündet in eine Verbrennungsluftleitung 12, über die dem Gasbrenner ein Verbrennungsluftstrom zugeführt wird. Der Verbrennungsluftleitung 12 ist ein Gebläse 13 zugeordnet. Die Drehzahl des Gebläses 13 bestimmt den Verbrennungsluftstrom. Innerhalb der Verbrennungsluftleitung 12 ist eine Drosselstelle 14 angeordnet, wobei die Gasleitung 10 stromabwärts der Drosselstelle 14 in die Verbrennungsluftleitung 12 mündet. Eine Gasdüse 15 schließt die Gasleitung 10 im Bereich der Verbrennungsluftleitung 12 ab. In Strömungsrichtung hinter der Gasdüse 15 liegt demzufolge ein Gas/Luft-Gemisch vor.The present invention relates to a method for controlling a gas burner, wherein the gas burner to be controlled, a gas / air mixture is supplied. In order to provide the gas / air mixture to be supplied to the gas burner, a gas stream can be fed to the gas burner via a
Zur Bereitstellung einer 1:1-Gas/Luft-Regelung dient ein Sensor 16, der mit einem Messpunkt 17 an der Gasleitung und mit einem weiteren Messpunkt 18 an der Verbrennungsluftleitung angreift. Der Sensor 16 ist als Durchflussmesser bzw. Anemometer ausgebildet und abhängig von den Strömungsverhältnissen bzw. Druckverhältnissen in der Gasleitung 10 sowie Verbrennungsluftleitung 12 durchströmt. Der detaillierte Aufbau des Sensors 16 ergibt sich aus
Der Sensor 16 erzeugt abhängig von dessen Durchströmung ein elektrisches bzw. elektronisches Messsignal 19, welches einem Regelgerät 20 zugeführt wird. Das Regelgerät 20 vergleicht den vom Sensor bereitgestellten Istwert mit einem Sollwert, wobei abhängig hiervon ein Stellsignal 21 für einen dem Gasventil 11 zugeordneten Stellantrieb 22 erzeugt wird. Bei einer 1:1-Gas/Luft-Regelung wird das Gasventil 11 über den Stellantrieb 22 derart geöffnet, dass der Gasstrom dem Verbrennungsluftstrom entspricht, dass also durch den Sensor 16 keine Strömung fließt.The
Der Sensor 16 verfügt gemäß
Die Baugruppen 24, 25, 27 und 28 des Sensors 16 sind derart ausgelegt, dass die Messeinrichtungen 24 und 25 des Sensors 16 einer Selbstaufheizung unterliegen. Zur Überprüfung, ob ein verschmutzungsbedingter Sensordrift des Sensors 16 vorliegt, wird die Selbstaufheizung der Messeinrichtungen 24 und 25 derart ausgenutzt, dass bei aktiver Regelung, also bei geöffnetem Gasventil 11 und laufendem Gebläse 13, die dem Sensor 16 zugeordnete Heizeinrichtung 23 in definierten Zeitabständen für einen definierten Zeitraum ausgeschaltet wird. Ein hierbei ermittelter Messwert wird als neuer Regelpunkt für 1:1-Gas/Luft-Regelung verwendet, wobei dann, wenn der im neuen Regelpunkt vorliegende Messwert des Sensors 16 größer als ein oberer Grenzwert oder kleiner als ein unterer Grenzwert ist, auf eine unzulässige Verschmutzung des Sensors 16 geschlossen wird.The
Eine Kurve 29 bzw. 29' zeigt das Messsignal U des Sensors 16 in Abhängigkeit vom Durchfluss Φ bei ausgeschalteter Heizeinrichtung 23 des Sensors 16. Eine Kurve 30 bzw. 30' zeigt hingegen das Messsignal U des Sensors 16 in Abhängigkeit vom Durchfluss Φ bei eingeschalteter Heizeinrichtung 23. Die beiden Kurven 29 und 30 der
Einem Vergleich der Diagramme gemäß
Wie bereits ausgeführt, wird dann, wenn in definierten Zeitabständen für einen definierten Zeitraum bei aktiver Regelung die Heizeinrichtung 23 des Sensors 16 ausgeschaltet wird, ein hierbei ermittelter Messwert als neuer Regelpunkt für die 1:1-Gas/Luft-Regelung verwendet, wobei hierdurch ein konvergierender Prozess zu einem neuen Regelpunkt für die Regelung des Gasbrenners führt.
Wie ebenfalls bereits ausgeführt, wird dann, wenn der im neuen Regelpunkt CP' vorliegende Messwert des Sensors 16 größer als ein oberer Grenzwert 31 oder kleiner als ein unterer Grenzwert 32 ist, auf eine unzulässige Verschmutzung des Sensors geschlossen, wobei dann der Gasbrenner vorzugsweise deaktiviert wird und/oder eine Warnmeldung erzeugt wird, um eine Wartung des Gasbrenners bzw. Sensors 16 zu veranlassen.As also already stated, if the measured value of the
Dann, wenn der im neuen Regelpunkt vorliegende Messwert des Sensors zwischen den beiden Grenzwerten 31 und 32 liegt, ist die Verschmutzung des Sensors noch zulässig, so dass noch ein ordnungsgemäßer Betrieb bzw. eine ordnungsgemäße Regelung des Gasbrenners möglich ist.Then, when the present in the new control point reading of the sensor between the two
- 1010
- Gasleitunggas pipe
- 1111
- Gasventilgas valve
- 1212
- VerbrennungsluftleitungCombustion air line
- 1313
- Gebläsefan
- 1414
- Drosselstellerestriction
- 1515
- Gasdüsegas nozzle
- 1616
- Sensorsensor
- 1717
- Messpunktmeasuring point
- 1818
- Messpunktmeasuring point
- 1919
- Messsignalmeasuring signal
- 2020
- Regelgerätregulator
- 2121
- Stellsignalactuating signal
- 2222
- Stellgerätpositioner
- 2323
- Heizeinrichtungheater
- 2424
- Messeinrichtungmeasuring device
- 2525
- Messeinrichtungmeasuring device
- 2626
- Verstärkeramplifier
- 2727
- Widerstandselementresistive element
- 2828
- Widerstandselementresistive element
- 29, 29'29, 29 '
- KurveCurve
- 30, 30'30, 30 '
- KurveCurve
- 3131
- oberer Grenzwertupper limit
- 3232
- unterer Grenzwertlower limit
Claims (3)
- Method for controlling a gas burner, wherein a gas burner is fed a stream of gas by way of a gas line (10), which is assigned a gas valve (11), and a stream of combustion air by way of a combustion air line (12), which is assigned a blower (13), wherein an electrical or electronic measuring signal provided by a sensor (16), which acts on the one hand on the gas line (10) and on the other hand on the combustion air line (12), is used for controlling the gas burner in such a way that the stream of gas corresponds to the stream of combustion air in the sense of a 1:1 gas/air control, and consequently a flow through the sensor (16) is approximately zero, characterized in that subassemblies (24, 25, 27, 28) of the sensor (16) are designed in such a way that measuring devices (24, 25) of the sensor (16) are subjected to self-heating, and in that, for checking whether there is any sensor drift caused by contamination, the self-heating of the measuring devices (24, 25) is used such that, in the case of active control, that is to say with an opened gas valve (11) and a running blower (13), a heating device (23) assigned to the sensor (16) is switched off at defined time intervals for a defined time period, wherein a measured value thereby determined is used as a new control point for the 1:1 gas/air control and, whenever the measured value of the sensor (16) obtained for the new control point is greater than an upper limit value (31) or less than a lower limit value (32), inadmissible contamination of the sensor (16) is inferred.
- Method according to Claim 1, characterized in that, whenever the measured value of the sensor (16) obtained for the new control point is greater than the upper limit value (31) or less than the lower limit value (32), the gas burner is deactivated.
- Method according to Claim 1 or 2, characterized in that, whenever the measured value of the sensor (16) obtained for the new control point is greater than the upper limit value (31) or less than the lower limit value (32), a warning message is produced.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007002846A DE102007002846B4 (en) | 2007-01-15 | 2007-01-15 | Method for controlling a gas burner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1944550A2 EP1944550A2 (en) | 2008-07-16 |
EP1944550A3 EP1944550A3 (en) | 2014-02-19 |
EP1944550B1 true EP1944550B1 (en) | 2015-07-15 |
Family
ID=39315210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07025166.5A Active EP1944550B1 (en) | 2007-01-15 | 2007-12-28 | Method for controlling a gas burner |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1944550B1 (en) |
DE (1) | DE102007002846B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011117736A1 (en) * | 2011-11-07 | 2013-05-08 | Honeywell Technologies Sarl | Method for operating a gas burner |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2825212B2 (en) * | 1991-10-17 | 1998-11-18 | 大阪瓦斯株式会社 | Combustion equipment |
DE19824521B4 (en) | 1998-06-02 | 2004-12-23 | Honeywell B.V. | Control device for gas burners |
DE10056064B4 (en) | 2000-11-11 | 2005-09-08 | Honeywell B.V. | Method for controlling a gas burner |
DE102005034758B3 (en) * | 2005-07-21 | 2006-08-10 | Honeywell Technologies S.A.R.L. | Method for operating a gas burner comprises actuating one or each gas valve for adjusting the gas stream through a gas line with a running fan depending on a signal from a sensor |
-
2007
- 2007-01-15 DE DE102007002846A patent/DE102007002846B4/en active Active
- 2007-12-28 EP EP07025166.5A patent/EP1944550B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1944550A2 (en) | 2008-07-16 |
EP1944550A3 (en) | 2014-02-19 |
DE102007002846B4 (en) | 2008-10-16 |
DE102007002846A1 (en) | 2008-07-17 |
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