EP3885653A1 - Dispositif de commutation et procédé de surveillance d'une flamme de brûleur - Google Patents

Dispositif de commutation et procédé de surveillance d'une flamme de brûleur Download PDF

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Publication number
EP3885653A1
EP3885653A1 EP21160196.8A EP21160196A EP3885653A1 EP 3885653 A1 EP3885653 A1 EP 3885653A1 EP 21160196 A EP21160196 A EP 21160196A EP 3885653 A1 EP3885653 A1 EP 3885653A1
Authority
EP
European Patent Office
Prior art keywords
flame
burner
signal
voltage
ionization
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.)
Pending
Application number
EP21160196.8A
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German (de)
English (en)
Inventor
Volker Kleine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP3885653A1 publication Critical patent/EP3885653A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • 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
    • F23N2229/00—Flame sensors
    • F23N2229/12—Flame sensors with flame rectification current detecting means

Definitions

  • the present invention relates to a circuit device and a method for operating a burner, in particular for monitoring a burner flame.
  • a gas flame of a gas burner when integrated into an ionization circuit, is known to act as a series connection of a high-ohmic resistor (approx. 10 to 100 megohms) and a diode that causes a rectifier effect.
  • This effect is shown, for example, in one from the publication EP 01 59 748 B. known circuit for flame monitoring exploited.
  • the ionization current flowing over the flame generates a DC measuring voltage on a capacitor provided for this purpose, which is applied to a signal input of a comparator and compared with a square-wave pulse sequence derived from the mains frequency.
  • a flame monitoring signal is derived from the comparison result, the frequency of which corresponds to the mains frequency.
  • this known arrangement In addition to monitoring the presence of the flame itself, this known arrangement also enables some particularly endangered circuit components to be monitored and generates a switch-off signal in the event of a malfunction of these components, but is nevertheless not reliable enough for continuous operation. In the event of errors in those components that generate the reference voltage used for comparison, a signal simulating the presence of a burner flame can arise. In addition, line frequency irradiation can lead to switching of the comparator arrangement. This is a general problem when - as in the known circuit - a reference voltage is provided at line frequency.
  • a flame monitor for gas burners uses the rectifying effect of a flame, which is known from the prior art, i.e. when an alternating voltage is applied between the so-called ionization electrode, which is located in the flame, and the burner surface, a direct current flows through the flame. This direct current is amplified and used to control the burner. Since this direct current is also superimposed by an alternating current component due to contact resistances, the direct current component must be filtered out of the flame signal, since only this direct current component represents the flame and the level of the direct current signal is also used to determine the combustion quality.
  • a flame amplifier for continuous operation which, however, is only suitable for the basic detection of a flame, which, however, is not reliable enough in operation.
  • the direct current component from the flame signal is used to operate an oscillator and to evaluate the oscillations of the oscillator as a flame signal.
  • the level of the flame signal cannot be evaluated with this method, only the basic presence of a signal.
  • Another possibility for burner monitoring is to carry out the flame signal evaluation twice, so to speak, and then to compare it with one another.
  • This method also has various disadvantages and is complex to implement.
  • the present invention is therefore based on the object of overcoming the aforementioned disadvantages in the prior art and of further developing a solution for burner monitoring in such a way that reliable operation is ensured with the possibility of continuous or permanent operation Monitoring, whereby the solution should be as cost-effective and reliable as possible.
  • a circuit device and a method for operating a burner in particular for monitoring a burner flame, are known in which a flame amplifier can continuously monitor the level of the flame signal during the entire burner operation in a fail-safe manner and measure it to control the combustion quality.
  • the invention is based on the concept of not completely filtering out the alternating current component from the flame signal, but rather of maintaining a small and actively controlled alternating current component.
  • This alternating current component can be monitored particularly efficiently and effectively from a safety point of view.
  • the signal thus consists of a direct current component and the small alternating current component.
  • the direct current component is used to regulate the flame through targeted averaging.
  • a circuit device for operating a burner in particular for monitoring a burner flame of a burner, comprising a flame amplifier, an ionization electrode, a flame signal processor, an ionization voltage generator for generating an ionization voltage, a low-pass filter and a control unit for measuring an ionization current to regulate the Combustion quality of the burner, whereby the flame current flowing through the burner flame when the burner is in operation is passed through the low-pass filter, which is designed to filter the flame current in such a way that in addition to the direct current component, there is also an alternating voltage component in the signal remains and this signal is fed to a signal evaluation.
  • the AC voltage component in the filtered current signal is lower, in particular significantly lower, compared to the DC voltage component.
  • an alternating voltage is generated by means of the ionization voltage generator, the frequency and level of which can be varied by the control device.
  • the ionization voltage generator is designed to generate an ionization voltage as a square-wave voltage with variable pulse widths.
  • a square-wave frequency with symmetrical pulse widths is generated for this purpose.
  • the ionization voltage generated by the ionization voltage generator is connected to an ionization electrode via a coupling network.
  • An advantageous variant of the method provides for the flame signal to be detected specifically at the times at which an average value is formed as follows, namely by detecting the DC voltage component of the filtered flame signal U ref and its minimum values U min and maximum values U max , in order to form the mean value required for the evaluation.
  • the flame signal is preferably sampled as a function of the phase position of the ionization voltage, the sampling point for recording the minimum values U min preferably being selected with a decreasing edge of the ionization voltage and the sampling point for recording the maximum values U max with a rising edge of the ionization voltage being selected.
  • FIG. 1 there is an exemplary embodiment of the invention in the form of a rule scheme.
  • a circuit device for operating a burner 1, in particular for monitoring the burner flame of a burner 1 is shown Low-pass filter 6 and a control unit 9 for measuring an ionization current 4 for regulating the combustion quality and for fail-safe flame monitoring of the burner 1.
  • An alternating voltage is generated in the ionization voltage generator 10, the frequency and level of which can be varied by the control device 9.
  • a square-wave frequency with symmetrical pulse widths is generated.
  • This ionization voltage generated in this way is connected to the ionization electrode 2 via the coupling network 5 shown.
  • this low-pass filtering takes place in a targeted manner incomplete.
  • This is therefore designed in such a way that a small AC voltage component remains in addition to the DC voltage component.
  • This AC voltage component is increased by a reference voltage U ref 11, then amplified in the amplifier 7 and then used as an evaluation signal 8 by the control unit 9 for flame monitoring and for regulating the combustion quality.
  • the task of the evaluation circuit is to detect the flame signal at the times at which a mean value can be formed, and a constant signal change is also used to check the reliable function of the amplifier circuit.
  • the time course of the filtered flame signal 8 is shown as an example.
  • the task of the evaluation circuit consists in detecting the flame signal or U ref 11 and its minimum values U min 24 and maximum values U max 25 in order to form the mean value 26 therefrom.
  • the determined mean value 26 must, as shown, correspond to the value U ref 11 without a flame signal, while the signal change is used to check the reliable function of the amplifier circuit.
  • the flame signal is scanned as a function of the phase position 21 of the ionization voltage, the scanning point 24 being with the falling edge 22 of the ionization voltage and the scanning point 25 with the rising edge 23 of the ionization voltage.
  • the diagram 30 is shown, which represents the course of the ionization voltage 3 in the presence of a flame. It can be seen that the zero point of this voltage is shifted relative to the direct current component due to the direct current that is now being added.
  • the lower right part shows the course of the corresponding evaluation signal 8 in the presence of a flame. It can be seen from this that the mean value 36 formed after the scans 32 and 33 from the values U min 34 and U max 35 has increased by the direct voltage component due to the flame current.
  • the relevant flame signal is determined from the difference between the two mean values 26, 36.

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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)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
EP21160196.8A 2020-03-24 2021-03-02 Dispositif de commutation et procédé de surveillance d'une flamme de brûleur Pending EP3885653A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020108006.9A DE102020108006A1 (de) 2020-03-24 2020-03-24 Schaltungsvorrichtung und Verfahren zum Überwachen einer Brennerflamme

Publications (1)

Publication Number Publication Date
EP3885653A1 true EP3885653A1 (fr) 2021-09-29

Family

ID=74856607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21160196.8A Pending EP3885653A1 (fr) 2020-03-24 2021-03-02 Dispositif de commutation et procédé de surveillance d'une flamme de brûleur

Country Status (2)

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EP (1) EP3885653A1 (fr)
DE (1) DE102020108006A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110821A (en) * 1979-02-20 1980-08-26 Seihoku Sangyo Kk Detecting device of oxygen insufficiency for combustor
EP0159748A1 (fr) 1984-04-12 1985-10-30 Koninklijke Philips Electronics N.V. Circuit de protection pour flamme
DE4027090A1 (de) 1990-08-28 1992-03-05 Kromschroeder Ag G Verfahren und anordnung zum ueberwachen einer brennerflamme
US5439374A (en) * 1993-07-16 1995-08-08 Johnson Service Company Multi-level flame curent sensing circuit
EP1293727A1 (fr) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Appareil de commande d'un brûleur et méthode de réglage
EP3106753A1 (fr) 2015-06-09 2016-12-21 Vaillant GmbH Surveillance de flammes
WO2019122976A1 (fr) * 2017-12-21 2019-06-27 Idea S.P.A. Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908679A1 (fr) 1997-10-10 1999-04-14 Electrowatt Technology Innovation AG Circuit de surveillance de flammes
DE102018120377A1 (de) 2018-08-21 2020-02-27 Truma Gerätetechnik GmbH & Co. KG Heizvorrichtung und Verfahren zum Regeln eines gebläsebetriebenen Gasbrenners

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110821A (en) * 1979-02-20 1980-08-26 Seihoku Sangyo Kk Detecting device of oxygen insufficiency for combustor
EP0159748A1 (fr) 1984-04-12 1985-10-30 Koninklijke Philips Electronics N.V. Circuit de protection pour flamme
DE4027090A1 (de) 1990-08-28 1992-03-05 Kromschroeder Ag G Verfahren und anordnung zum ueberwachen einer brennerflamme
US5439374A (en) * 1993-07-16 1995-08-08 Johnson Service Company Multi-level flame curent sensing circuit
EP1293727A1 (fr) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Appareil de commande d'un brûleur et méthode de réglage
EP3106753A1 (fr) 2015-06-09 2016-12-21 Vaillant GmbH Surveillance de flammes
WO2019122976A1 (fr) * 2017-12-21 2019-06-27 Idea S.P.A. Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz

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DE102020108006A1 (de) 2021-09-30

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