EP1460338B1 - Circuit arrangement for determining the flame current of a burner - Google Patents

Circuit arrangement for determining the flame current of a burner Download PDF

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Publication number
EP1460338B1
EP1460338B1 EP04006848A EP04006848A EP1460338B1 EP 1460338 B1 EP1460338 B1 EP 1460338B1 EP 04006848 A EP04006848 A EP 04006848A EP 04006848 A EP04006848 A EP 04006848A EP 1460338 B1 EP1460338 B1 EP 1460338B1
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EP
European Patent Office
Prior art keywords
circuit arrangement
flame
flame current
measuring device
determining
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
EP04006848A
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German (de)
French (fr)
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EP1460338A1 (en
Inventor
Derk Vegter
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Honeywell BV
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Honeywell BV
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    • 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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/16—Measuring bridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors

Definitions

  • the invention relates to a circuit arrangement for determining the flame flow of a burner by means of a flame rod.
  • the EP 0 867 661 shows a flame detector whose flame is monitored by means of a flame rod.
  • This flameguard takes advantage of the Rectifier feature of the flame.
  • the flame rod is powered by a capacitor and a resistor network with an AC voltage, whereas the burner or the burner nozzle is grounded. Another output of the resistor network is connected to an amplifier. If a half-wave of the alternating voltage flows via the flame due to an existing flame, an output signal indicating the flame is produced at the output of the flame amplifier. Upon termination of the flame, an alternating voltage is supplied to the flame amplifier, so that at the output of a correspondingly different signal is produced that indicates the failure of a flame reliably.
  • Another flame guard of this kind is from the EP 0 498 619 A2 known. Also, this flame detector is not intended for quantitative measurement of the flame stream.
  • a änhliche circuit arrangement for determining the flame current of a burner is from the EP 1 331 446 A2 known.
  • the invention is the object of the invention to provide a circuit arrangement for determining the flame current of a burner, which allows a reliable determination of the flame current.
  • the circuit arrangement according to claim 1 therefore comprises, in addition to a measuring device for determining a flame current with the aid of a high-frequency excitation voltage, the possibility that the determination of the flame current is at least once with switched off and at least once with activated exciter voltage.
  • the two flame currents determined here are subtracted from each other. This reduces the interference on the measurement result. Also, a fail-safe behavior is ensured by this measure, since in case of failure of the measuring arrangement, the result would automatically be zero.
  • the circuit arrangement is designed such that the comparison device activates the measuring device for determining the flame current when the ground potential approaches ground potential. This is usually the case after 20 milliseconds because of the commonly used frequency of 50 Hz.
  • the measuring device can also determine the flame flow continuously. Then, however, it must be ensured by the comparison device that the determination result is output only when the ground potential corresponds to the ground potential.
  • the measuring device is advantageously suitable for determining the height of the flame flow.
  • the exact size of the flame current is determined, for example, by means of a high-frequency exciter voltage.
  • a non-earthed center further means a center that has no low-resistance connection to the earth, but is not isolated from this, so that there is a high-resistance connection.
  • 1 is a measuring device with 2 a comparison device, with 3 a voltage supply device, with 4 a connection for a flame rod, with 5 a connection for a burner or a burner nozzle, with 6 the ground potential, with 7 the ground potential, with 8 an output terminal of the measuring device and 9 denotes a supply voltage terminal of the voltage supply device 3.
  • the two supply voltage terminals 9 of the voltage supply device 3 are to be connected in the case of a power supply from a network with non-grounded center each with a phase of the three-phase network.
  • the power supply terminals 9 may be connected to a phase conductor and a neutral conductor.
  • the voltage supply device 3 supplies, as shown in the picture, the connection 4 for the flame rod or the measuring device 1 with an alternating voltage which has the frequency of the three-phase network or twice the frequency. A supply with a higher frequency is possible.
  • the voltage supply device serves to supply power to the measuring device 1 and the comparison device 2 via leads not shown in the figure.
  • the power supply device 3 generates Furthermore, the ground potential 6, which is also supplied to the comparison device 2.
  • the ground potential 6 can also be supplied to the measuring device 1 via a supply line, not shown in the figure.
  • a part of the voltage supply device 3 for supplying power to the flame rod 4 can, as in the EP 0 867 661 specified to be executed.
  • the measuring device 1 comprises at least one measuring amplifier and is designed such that it outputs at its output terminal 8 a signal which is proportional to the height of the flame stream.
  • this may be a digital or analog signal, whereas in the case of the design of the measuring device as a purely analog measuring device is an analog signal.
  • the comparator 2 comprises at least one comparator, e.g. can be formed by an operational amplifier. One terminal of this comparator is connected to the grounded burner or the grounded burner nozzle, whereas another terminal of this comparator is connected to the ground potential provided by the voltage supply device. As a result, the comparator 2 is enabled to output an output signal indicating whether or not the ground potential is equal to the ground potential. This output signal is fed to the measuring device 1.
  • the measuring device can be activated by the output signal of the comparison device for measuring the flame current.
  • the measuring device 1 can also determine the flame current continuously, but only output it when the comparison device determines that the ground potential corresponds to the ground potential.
  • the measuring device can pass on the measuring signal determined in this way either to the output terminal 8 only if the ground potential corresponds to the ground potential or if the output signal output to the output terminal 8 changes only when it no longer corresponds to the previously determined and the ground potential corresponds to the ground potential ,
  • the circuit arrangement shown is designed to determine the flame current when supplying the power supply device from a three-phase network without grounded center, but can advantageously be used simultaneously but also when supplying the power supply device from a three-phase network with grounded center.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

A measurement unit (1) determined the flame current, using a high frequency measurement potential. The flame current is measured once with the measurement potential switched on, and once with it switched off. The results are subtracted.

Description

Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Ermittlung des Flammenstromes eines Brenners mit Hilfe eines Flammenstabes.The invention relates to a circuit arrangement for determining the flame flow of a burner by means of a flame rod.

Die EP 0 867 661 zeigt einen Flammenwächter, dessen Flamme mit Hilfe eines Flammenstabes überwacht wird. Dieser Flammenwächter macht sich die Gleichrichtereigenschaft der Flamme zunutze. Der Flammenstab wird über einen Kondensator und ein Widerstandsnetzwerk mit einer Wechselspannung versorgt, wohingegen der Brenner bzw. die Brennerdüse geerdet ist. Ein anderer Ausgang des Widerstandsnetzwerkes ist mit einem Verstärker verbunden. Fließt auf Grund einer vorhandenen Flamme eine Halbwelle der Wechselspannung über die Flamme ab, entsteht am Ausgang des Flammenverstärkers ein die Flamme anzeigendes Ausgangssignal. Bei Abbruch der Flamme wird dem Flammenverstärker eine Wechselspannung zugeführt, so dass an dessen Ausgang ein entsprechend anderes Signal entsteht, dass das Nicht-Bestehen einer Flamme zuverlässig anzeigt.The EP 0 867 661 shows a flame detector whose flame is monitored by means of a flame rod. This flameguard takes advantage of the Rectifier feature of the flame. The flame rod is powered by a capacitor and a resistor network with an AC voltage, whereas the burner or the burner nozzle is grounded. Another output of the resistor network is connected to an amplifier. If a half-wave of the alternating voltage flows via the flame due to an existing flame, an output signal indicating the flame is produced at the output of the flame amplifier. Upon termination of the flame, an alternating voltage is supplied to the flame amplifier, so that at the output of a correspondingly different signal is produced that indicates the failure of a flame reliably.

Ein weiterer Flammenwächter dieser Art ist aus der EP 0 498 619 A2 bekannt. Auch dieser Flammenwächter ist nicht zur quantitativen Messung des Flammenstromes bestimmt.Another flame guard of this kind is from the EP 0 498 619 A2 known. Also, this flame detector is not intended for quantitative measurement of the flame stream.

Eine änhliche Schaltungsanordnung zur Ermittlung des Flammenstromes eines Brenners ist aus der EP 1 331 446 A2 bekannt.A änhliche circuit arrangement for determining the flame current of a burner is from the EP 1 331 446 A2 known.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, eine Schaltungsanordnung zur Ermittlung des Flammenstromes eines Brenners anzugeben, die eine zuverlässige Ermittlung des Flammenstromes ermöglicht.The invention is the object of the invention to provide a circuit arrangement for determining the flame current of a burner, which allows a reliable determination of the flame current.

Diese Aufgabe wird durch eine Schaltungsanordnung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a circuit arrangement having the features of patent claim 1.

Die Schaltungsanordnung gemäß Patentanspruch 1 umfasst demzufolge neben einer Messeinrichtung zur Ermittlung eines Flammenstromes mit Hilfe einer hochfrequenten Erregerspannung, die Möglichkeit, dass die Ermittlung des Flammenstromes zumindest einmal mit ausgeschalteter und zumindest einmal mit eingeschalteter Erregerspannung erfolgt. Die beiden hierbei ermittelten Flammenströme werden voneinander abgezogen. Hierdurch reduzieren sich die Störeinflüsse auf das Messergebnis. Auch wird durch diese Maßnahme ein Fail-Safe-Verhalten sichergestellt, da bei einem Ausfall der Messanordnung das Ergebnis automatisch Null wäre.The circuit arrangement according to claim 1 therefore comprises, in addition to a measuring device for determining a flame current with the aid of a high-frequency excitation voltage, the possibility that the determination of the flame current is at least once with switched off and at least once with activated exciter voltage. The two flame currents determined here are subtracted from each other. This reduces the interference on the measurement result. Also, a fail-safe behavior is ensured by this measure, since in case of failure of the measuring arrangement, the result would automatically be zero.

Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous developments of the invention are the subject of the dependent claims.

Vorteilhafterweise ist die Schaltungsanordnung derart ausgelegt, dass die Vergleichseinrichtung die Messeinrichtung zur Ermittlung des Flammenstromes dann aktiviert, wenn sich das Massepotential an das Erdpotential annähert. Dies ist wegen der üblicherweise verwendeten Frequenz von 50 Hz normalerweise nach 20 Millisekunden der Fall.Advantageously, the circuit arrangement is designed such that the comparison device activates the measuring device for determining the flame current when the ground potential approaches ground potential. This is usually the case after 20 milliseconds because of the commonly used frequency of 50 Hz.

Alternativ hierzu kann die Messeinrichtung den Flammenstrom auch kontinuierlich ermitteln. Dann muss aber durch die Vergleichseinrichtung sichergestellt werden, dass das Ermittlungsergebnis nur dann ausgegeben wird, wenn das Massepotential dem Erdpotential entspricht.Alternatively, the measuring device can also determine the flame flow continuously. Then, however, it must be ensured by the comparison device that the determination result is output only when the ground potential corresponds to the ground potential.

Die Messeinrichtung ist vorteilhafter Weise zur Ermittlung der Höhe des Flammenstroms geeignet. Die genaue Größe des Flammenstroms ermittelt sie dabei beispielsweise anhand einer hochfrequenten Erregerspannung.The measuring device is advantageously suitable for determining the height of the flame flow. The exact size of the flame current is determined, for example, by means of a high-frequency exciter voltage.

Die Erfindung wird nachfolgend anhand der Figur näher erläutert.The invention will be explained in more detail with reference to FIG.

Ein nicht geerdeter Mittelpunkt bedeutet im weiteren einen Mittelpunkt, der keine niederohmige Verbindung mit der Erde aufweist, von dieser aber auch nicht isoliert ist, so dass eine hochohmige Verbindung besteht.A non-earthed center further means a center that has no low-resistance connection to the earth, but is not isolated from this, so that there is a high-resistance connection.

In der Figur ist mit 1 eine Messeinrichtung mit 2 eine Vergleichseinrichtung, mit 3 eine Spannungsversorgungseinrichtung, mit 4 ein Anschluss für einen Flammenstab, mit 5 ein Anschluss für einen Brenner bzw. eine Brennerdüse, mit 6 das Massepotential, mit 7 das Erdpotential, mit 8 ein Ausgangsanschluss der Messeinrichtung und mit 9 ein Versorgungsspannungsanschluss der Spannungsversorgungseinrichtung 3 bezeichnet.In the figure, 1 is a measuring device with 2 a comparison device, with 3 a voltage supply device, with 4 a connection for a flame rod, with 5 a connection for a burner or a burner nozzle, with 6 the ground potential, with 7 the ground potential, with 8 an output terminal of the measuring device and 9 denotes a supply voltage terminal of the voltage supply device 3.

Die beiden Versorgungsspannungsanschlüsse 9 der Spannungsversorgungseinrichtung 3 sind im Falle einer Spannungsversorgung aus einem Netz mit nicht geerdetem Mittelpunkt jeweils mit einer Phase des Drehstromnetzes zu verbinden. Im Falle der Spannungsversorgung aus einem Drehstromnetz mit geerdetem Mittelpunkt können die Spannungsversorgungsanschlüsse 9 mit einem Phasenleiter und einem Nulleiter verbunden werden.The two supply voltage terminals 9 of the voltage supply device 3 are to be connected in the case of a power supply from a network with non-grounded center each with a phase of the three-phase network. In the case of the power supply from a grounded center three-phase network, the power supply terminals 9 may be connected to a phase conductor and a neutral conductor.

Die Spannungsversorgungseinrichtung 3 versorgt, wie im Bild gezeigt, den Anschluss 4 für den Flammenstab bzw. die Messeinrichtung 1 mit einer Wechselspannung, die die Frequenz des Drehstromnetzes oder die doppelte Frequenz aufweist. Auch eine Versorgung mit einer höheren Frequenz ist möglich.The voltage supply device 3 supplies, as shown in the picture, the connection 4 for the flame rod or the measuring device 1 with an alternating voltage which has the frequency of the three-phase network or twice the frequency. A supply with a higher frequency is possible.

Darüber hinaus dient die Spannungsversorgungseinrichtung zur Spannungsversorgung der Messeinrichtung 1 sowie der Vergleichseinrichtung 2 über in der Figur nicht gezeigte Zuleitungen. Die Spannungsversorgungseinrichtung 3 erzeugt ferner das Massepotential 6, das ebenfalls der Vergleichseinrichtung 2 zugeführt wird. Je nach Bedarf kann das Massepotential 6 ebenfalls auch der Messeinrichtung 1 über eine in der Figur nicht gezeigte Zuleitung zugeführt werden.In addition, the voltage supply device serves to supply power to the measuring device 1 and the comparison device 2 via leads not shown in the figure. The power supply device 3 generates Furthermore, the ground potential 6, which is also supplied to the comparison device 2. Depending on requirements, the ground potential 6 can also be supplied to the measuring device 1 via a supply line, not shown in the figure.

Ein Teil der Spannungsversorgungseinrichtung 3 zur Spannungsversorgung des Flammenstabes 4 kann, wie in der EP 0 867 661 angegeben, ausgeführt sein.A part of the voltage supply device 3 for supplying power to the flame rod 4 can, as in the EP 0 867 661 specified to be executed.

Die Messeinrichtung 1 umfasst zumindest einen Messverstärker und ist derart ausgestaltet, dass sie an ihrem Ausgangsanschluss 8 ein Signal ausgibt, das zur Höhe des Flammenstromes proportional ist. Im Falle der Ausbildung der Messeinrichtung in digitaler Form kann es sich hierbei um ein digitales oder analoges Signal handeln, wohingegen es sich im Falle der Ausbildung der Messeinrichtung als rein analoge Messeinrichtung um ein analoges Signal handelt.The measuring device 1 comprises at least one measuring amplifier and is designed such that it outputs at its output terminal 8 a signal which is proportional to the height of the flame stream. In the case of the training of the measuring device in digital form, this may be a digital or analog signal, whereas in the case of the design of the measuring device as a purely analog measuring device is an analog signal.

Die Vergleichseinrichtung 2 umfasst zumindest einen Komparator, der z.B. durch einen Operationsverstärker gebildet werden kann. Ein Anschluss dieses Komparators ist mit dem geerdeten Brenner bzw. der geerdeten Brennerdüse verbunden, wohingegen ein anderer Anschluss dieses Komparators mit dem von der Spannungsversorgungseinrichtung bereitgestellten Massepotential verbunden ist. Hierdurch wird die Vergleichseinrichtung 2 in die Lage versetzt, ein Ausgangssignal auszugeben, das angibt, ob das Massepotential gerade dem Erdpotential entspricht oder nicht. Dieses Ausgangssignal wird der Messeinrichtung 1 zugeführt.The comparator 2 comprises at least one comparator, e.g. can be formed by an operational amplifier. One terminal of this comparator is connected to the grounded burner or the grounded burner nozzle, whereas another terminal of this comparator is connected to the ground potential provided by the voltage supply device. As a result, the comparator 2 is enabled to output an output signal indicating whether or not the ground potential is equal to the ground potential. This output signal is fed to the measuring device 1.

Zur Ermittlung des Flammenstromes kann die Messeinrichtung durch das Ausgangssignal der Vergleichseinrichtung zur Messung des Flammenstromes aktiviert werden.To determine the flame current, the measuring device can be activated by the output signal of the comparison device for measuring the flame current.

Alternativ hierzu kann die Messeinrichtung 1 den Flammenstrom auch kontinuierlich ermitteln, ihn aber nur dann ausgeben, wenn die Vergleichseinrichtung feststellt, dass das Massepotential dem Erdpotential entspricht. Hierbei kann die Messeinrichtung das derart ermittelte Messsignal entweder nur dann an den Ausgangsanschluss 8 weitergeben, wenn das Massepotential dem Erdpotential entspricht oder aber nur dann das an den Ausgangsanschluss 8 abgegebene Ausgangssignal ändern, wenn es nicht mehr dem zuvor ermittelten entspricht und das Massepotential dem Erdpotential entspricht.Alternatively, the measuring device 1 can also determine the flame current continuously, but only output it when the comparison device determines that the ground potential corresponds to the ground potential. In this case, the measuring device can pass on the measuring signal determined in this way either to the output terminal 8 only if the ground potential corresponds to the ground potential or if the output signal output to the output terminal 8 changes only when it no longer corresponds to the previously determined and the ground potential corresponds to the ground potential ,

Die gezeigte Schaltungseinrichtung ist zur Ermittlung des Flammenstromes bei Versorgung der Stromversorgungseinrichtung aus einem Drehstromnetz ohne geerdeten Mittelpunkt ausgelegt, kann vorteilhafterweise gleichzeitig aber auch bei Versorgung der Stromversorgungseinrichtung aus einem Drehstromnetz mit geerdetem Mittelpunkt verwendet werden.The circuit arrangement shown is designed to determine the flame current when supplying the power supply device from a three-phase network without grounded center, but can advantageously be used simultaneously but also when supplying the power supply device from a three-phase network with grounded center.

Claims (6)

  1. Circuit arrangement for determining the flame current of a burner, having
    a measuring device (1) for determining the flame current with the aid of a high-frequency measuring voltage,
    the flame current sometimes being determined with the measuring voltage switched on and sometimes being determined with the measuring voltage switched off, and the results being subtracted from one another.
  2. Circuit arrangement according to Claim 1, characterized by
    a comparison device (2) for comparing the earth potential (7) with a frame potential (6) of the circuit arrangement,
    the flame current being determined when the frame potential corresponds to the earth potential.
  3. Circuit arrangement according to Claim 2, characterized in that the comparison device activates the measuring device for determining the flame current when the frame potential approaches the earth potential.
  4. Circuit arrangement according to Claim 2, characterized
    in that the comparison device causes the measuring device to switch the measuring voltage on and off in synchronism with the frequency of the frame or earth potential.
  5. Circuit arrangement according to Claim 2, characterized in that the measuring device continuously determines the flame current, but the determination result is output only when the frame potential corresponds to the earth potential.
  6. Circuit arrangement according to Claim 1, characterized in that the measuring device measures the level of the flame current.
EP04006848A 2003-03-21 2004-03-22 Circuit arrangement for determining the flame current of a burner Expired - Lifetime EP1460338B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10312669A DE10312669B3 (en) 2003-03-21 2003-03-21 Circuit arrangement for determining the flame current of a burner
DE10312669 2003-03-21

Publications (2)

Publication Number Publication Date
EP1460338A1 EP1460338A1 (en) 2004-09-22
EP1460338B1 true EP1460338B1 (en) 2011-11-02

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Application Number Title Priority Date Filing Date
EP04006848A Expired - Lifetime EP1460338B1 (en) 2003-03-21 2004-03-22 Circuit arrangement for determining the flame current of a burner

Country Status (4)

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EP (1) EP1460338B1 (en)
AT (1) ATE532008T1 (en)
DE (1) DE10312669B3 (en)
ES (1) ES2374180T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3059496A1 (en) 2015-02-23 2016-08-24 Honeywell Technologies Sarl Measuring arrangement for a gas burner, gas burner and method for operating the gas burner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2536128T3 (en) * 2011-03-03 2015-05-20 Siemens Aktiengesellschaft Burner installation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663077A5 (en) * 1983-12-14 1987-11-13 Landis & Gyr Ag SELF-MONITORING FLAME GUARD.
NL8401173A (en) * 1984-04-12 1985-11-01 Philips Nv FLAME PROTECTION CIRCUIT.
DE19712938C1 (en) * 1997-03-27 1998-05-14 Honeywell Bv Burner flame monitor supply voltage circuit for power plant
DE19726169C2 (en) * 1997-06-20 2003-02-27 Stiebel Eltron Gmbh & Co Kg Control device for a gas burner
EP0908679A1 (en) * 1997-10-10 1999-04-14 Electrowatt Technology Innovation AG Circuit for flame monitoring
DE10202910C1 (en) * 2002-01-25 2003-10-16 Honeywell Bv Circuit arrangement for determining the flame current of a burner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3059496A1 (en) 2015-02-23 2016-08-24 Honeywell Technologies Sarl Measuring arrangement for a gas burner, gas burner and method for operating the gas burner

Also Published As

Publication number Publication date
ATE532008T1 (en) 2011-11-15
EP1460338A1 (en) 2004-09-22
DE10312669B3 (en) 2004-10-21
ES2374180T3 (en) 2012-02-14

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