EP2154430A1 - Dispositif de commande pour un brûleur à gaz - Google Patents

Dispositif de commande pour un brûleur à gaz Download PDF

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Publication number
EP2154430A1
EP2154430A1 EP08105048A EP08105048A EP2154430A1 EP 2154430 A1 EP2154430 A1 EP 2154430A1 EP 08105048 A EP08105048 A EP 08105048A EP 08105048 A EP08105048 A EP 08105048A EP 2154430 A1 EP2154430 A1 EP 2154430A1
Authority
EP
European Patent Office
Prior art keywords
amplifier
ionization
flame
gas
control device
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
Application number
EP08105048A
Other languages
German (de)
English (en)
Other versions
EP2154430B1 (fr
Inventor
Rainer Dr. Lochschmied
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.)
Siemens AG
Original Assignee
Siemens Building Technologies HVAC Products GmbH
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Filing date
Publication date
Application filed by Siemens Building Technologies HVAC Products GmbH filed Critical Siemens Building Technologies HVAC Products GmbH
Priority to EP08105048.6A priority Critical patent/EP2154430B1/fr
Publication of EP2154430A1 publication Critical patent/EP2154430A1/fr
Application granted granted Critical
Publication of EP2154430B1 publication Critical patent/EP2154430B1/fr
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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

Definitions

  • the present invention relates to a control device with an arranged in the flame region of a gas burner ionization electrode which detects a combustion dependent ionization current, wherein a signal processing circuit in response to the ionization provides a controlled variable for a control unit, which the ratio of air to gas in the combustion after a Setpoint.
  • a control device of the type mentioned is, for example, from the EP 1 154 203 B1 known.
  • a mains AC voltage via a capacitive coupling element (blocking capacitor) of the measuring device is switched.
  • the blocking capacitor separates the direct current component caused by the flame from the alternating voltage and shields the measuring device, for example against interference occurring in the voltage network.
  • the blocking capacitor must not fail during the measurement.
  • the invention has for its object to provide a control device with a signal processing circuit, which allows a reliable measurement and error-free processing of the measurement signal to a controlled variable for a gas-air composite control despite its simple structure.
  • the signal processing circuit comprises an amplifier whose input is connected to a ground potential of the gas burner, wherein the ionization electrode is connected to a voltage source which generates an alternating voltage, galvanic from the power supply of the voltage source is disconnected.
  • the signal processing circuit switched AC voltage flows from the ionization through the flame an ionization with a caused by the flame DC component to the input of the amplifier, which amplifies the ionization or only caused by the flame DC component.
  • the DC component flows back through the voltage source to the ionization electrode and thus forms a closed circuit with the flame.
  • the invention has the advantage that the alternating voltage used for the measurement of the mains supply is galvanically isolated and the control of the measurement signal dependent parameters such. B. smooth ionization, peak or RMS value of the ionization, flame resistance can be used as a controlled variable. Therefore, the regulation based thereon z. B. independent of interference occurring in the network. Also, the signal processing circuit can be constructed inexpensively from a few components with high reliability. The invention is preferably used in conjunction with a premix burner.
  • FIG. 1 shows in a functional block diagram, a gas-air composite control with a gas burner with flame 1 wherein in the flame area 1 an ionization electrode 2 is arranged, which is connected via a line 14 to a signal processing circuit 3.
  • the signal processing circuit 3 is connected to a voltage supply 13 and connected via a line 15 to the ground potential 15 of the gas burner.
  • the signal processing circuit 3 provides a controlled variable 21 for the control unit 4 as a function of the measurement signal of the ionization electrode.
  • the control unit 4 In the case of a heat or power requirement 19, 20, the control unit 4 generates corresponding control signals 16, 17, whereby the amount of air or gas 10, 11 can be adjusted.
  • the control signal 16 controls z.
  • B. a gas valve 5 and the control signal 17 controls a fan 6.
  • the fan 6 is z.
  • ambient air 8 is supplied and the gas valve 5 is connected to a gas supply 9.
  • a mixer 7 mixes the amount of air 10 set by the fan 6 with the gas quantity 11 set by the gas valve 5 to a mixture 12 which the gas burner 1 burns.
  • the signal 18 is optional and denotes a feedback of the amount of blower 10.
  • FIG. 2 shows an electrical equivalent circuit diagram for a gas burner flare with a rectifying flame diode DF and a flame resistance RF. This electrical equivalent circuit usually describes the characteristics of the flame with sufficient accuracy.
  • FIG. 3a shows a first embodiment of a signal processing circuit 3, for example, in connection with the in FIG. 1 shown gas-air composite control is used.
  • the signal processing circuit 3 has a voltage source S, z. B. a transformer on the primary circuit, a power supply, for. B. a mains voltage 13 is connected.
  • the secondary circuit of the transformer S provides an AC voltage 25 which is galvanically isolated from the mains voltage 13.
  • the AC voltage 25 is electrically connected via a line 14 to the arranged in the flame region 1 of the gas burner ionization electrode 2.
  • Flammenersatzersatzsent flows from the ionization electrode 2, an ionization 26 with a caused by the flame diode DF DC component to a ground potential 15 of the gas burner and from there to an amplifier, the z. B. comprises an operational amplifier IC1 and a feedback resistor R2.
  • the input of the amplifier is connected to the ground potential (15) of the gas burner.
  • Parallel to the resistor R2, a capacitor C1 is connected, whereby only the DC component of the ionization current 26 caused by the flame 1 or by the flame diode DF is amplified.
  • the DC component flows through a resistor R1 through the voltage source S to the ionization electrode 2 and from there through the flame 1 to the ground potential 15.
  • the resistor R1 limited in the case of a short circuit of the ionization electrode 2 to the ground potential 15, the current flowing in the circuit current.
  • a resistor R3 and a capacitor C2 are connected in series, whereby the amplified DC component is smoothed. This one is from the signal processing circuit 3 as a controlled variable 21 of in FIG. 1 shown control unit 4 provided.
  • FIG. 3a shown signal processing circuit is based on the in FIG. 3b illustrated diagram illustrates.
  • This shows the waveform for a flame with a flame resistance RF according to the equivalent circuit of FIG. 2 .
  • the amplitude and the waveform of the AC voltage 25 are known, depending on the combustion of the ionization 26 and the smoothed DC component 21 set.
  • Case A the combustion of a high energy content gas is shown.
  • Case B shows the case that the energy content of the gas during combustion becomes lower, ie lower calorie, than in case A.
  • the ionization current 26 decreases and, as a consequence, the signal level of the DC component 21 decreases FIG.
  • control unit 4 detected as a deviation of the controlled variable from the setpoint and then the control unit increases the amount of gas until the signal level of the DC component 21 has again adjusted to the setpoint as in A.
  • the lower energy content of the gas B can be compensated by increasing the amount of gas or by reducing the amount of air, so that the gas-air ratio is equal again.
  • signal processing circuit 3 consists of the parts 3a and 3c.
  • Part 3a is in FIG. 5 shown in detail.
  • the part 3c can z. B. be executed as a microcontroller, which processes the signal provided by the circuit 3a 3b to a controlled variable 21 for the control unit 4.
  • the ionization current 26 from the amplifier comprising the operational amplifier IC1 and the resistor R2 is amplified to a signal 3b.
  • the signal 3b is z. B. the peak value of the ionization current 26.
  • This value is then used as a controlled variable 21 of the control unit 4.
  • the RMS value of the ionization current can be used as a controlled variable.
  • FIG. 6 shows an embodiment of a gas-air composite control, which additionally has a processing unit 23. This determines, based on the signals or quantities 21 and 22 obtained from the signal processing circuit 3, the in FIG. 2 illustrated flame resistance RF. The calculated flame resistance RF is then made available to the control device 4 as a controlled variable 24.
  • signal processing circuit 3 is in Figure 7a shown in detail. The operation of the signal processing circuit 3 is based on the in FIG. 7b shown diagram in connection with the equivalent circuit diagram according to FIG. 2 clarified.
  • the signal processing circuit 3 has a second amplifier, the z. B comprises the operational amplifier IC2, the diode D1 and the resistor R6.
  • the input of the second amplifier is connected in series via a resistor R4 to the first amplifier comprising an operational amplifier IC1 and a feedback resistor R2.
  • a resistor R5 is connected, which is parallel to the current path formed by the ionization electrode 2, the flame 1 and the first amplifier. Resistor R5 causes a small alternating current component with zero crossing to flow through resistor R1. In the blocking half-wave of flame 1, only the alternating current component flows out of resistor R5 through R4.
  • the direct current component originating from the flame 1 or the flame diode DF adds to this.
  • the voltage R 27 is applied to the resistor R4.
  • a resistor R7 and a capacitor C3 are connected in series, whereby the in FIG. 7b shown signal 22 is obtained.
  • FIG. 7b shown diagram shows the AC voltage 25, the peak value 22 of the upper one with existing flame Blocking half-wave, the ionization current 26, the smoothed DC component 21 and the voltage applied to the resistor R4 27.
  • the amplitude of the AC voltage 25 may be calculated from the peak value of the signal 22.
  • the flame resistance RF can then be determined from the signal 21 at the respective time and as shown in FIG FIG. 6 shown used by the control unit 4 as a controlled variable 24. As a result, fluctuations in the power supply 13 or component tolerances of the voltage source S have no effect on the controlled variable 24.
  • Case A and B show combustion with different energy contents.
  • Case B shows the combustion with a gas of low energy content and Case A shows the combustion of a gas whose energy content is higher, ie higher calorific.
  • the ionization current 26 increases with respect to case B and as a result the signal level of the DC component 21 increases
  • FIG. 6 shown control unit 4 detected as a deviation from the setpoint. The control unit 4 then reduces the amount of gas until the signal level of the DC component 21 has again adjusted to the setpoint as in B.
  • the higher energy content of the gas B can alternatively be compensated by increasing the amount of air.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Control Of Combustion (AREA)
EP08105048.6A 2008-08-15 2008-08-15 Dispositif de commande pour un brûleur à gaz, et utilisation d'un tel dispositiv Active EP2154430B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08105048.6A EP2154430B1 (fr) 2008-08-15 2008-08-15 Dispositif de commande pour un brûleur à gaz, et utilisation d'un tel dispositiv

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08105048.6A EP2154430B1 (fr) 2008-08-15 2008-08-15 Dispositif de commande pour un brûleur à gaz, et utilisation d'un tel dispositiv

Publications (2)

Publication Number Publication Date
EP2154430A1 true EP2154430A1 (fr) 2010-02-17
EP2154430B1 EP2154430B1 (fr) 2015-09-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2495496A1 (fr) 2011-03-03 2012-09-05 Siemens Aktiengesellschaft Installation de brûleur
CN111396869A (zh) * 2020-03-16 2020-07-10 济南红烛科技有限公司 一种低热值燃气燃烧器及燃烧技术
DE102020126788A1 (de) 2020-10-13 2022-04-14 Ebm-Papst Landshut Gmbh Flammenverstärker zur Flammenüberwachung sowie zugehöriges Verfahren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153126A (en) * 1983-12-14 1985-08-14 Landis & Gyr Ag Self-monitoring flame monitor
WO2002095295A1 (fr) * 2001-05-25 2002-11-28 Siemens Building Technologies Ag Dispositif de controle de flamme
EP1293727A1 (fr) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Appareil de commande d'un brûleur et méthode de réglage
EP1519114A1 (fr) 2003-09-26 2005-03-30 Betronic Design B.V. Système de surveillance de flamme
EP1154203B1 (fr) 2000-05-12 2006-08-23 Siemens Schweiz AG Dispositif de mesure pour une flamme

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153126A (en) * 1983-12-14 1985-08-14 Landis & Gyr Ag Self-monitoring flame monitor
EP1154203B1 (fr) 2000-05-12 2006-08-23 Siemens Schweiz AG Dispositif de mesure pour une flamme
WO2002095295A1 (fr) * 2001-05-25 2002-11-28 Siemens Building Technologies Ag Dispositif de controle de flamme
EP1293727A1 (fr) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Appareil de commande d'un brûleur et méthode de réglage
EP1519114A1 (fr) 2003-09-26 2005-03-30 Betronic Design B.V. Système de surveillance de flamme

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2495496A1 (fr) 2011-03-03 2012-09-05 Siemens Aktiengesellschaft Installation de brûleur
US9062882B2 (en) 2011-03-03 2015-06-23 Siemens Aktiengesellschaft Burner system
CN111396869A (zh) * 2020-03-16 2020-07-10 济南红烛科技有限公司 一种低热值燃气燃烧器及燃烧技术
DE102020126788A1 (de) 2020-10-13 2022-04-14 Ebm-Papst Landshut Gmbh Flammenverstärker zur Flammenüberwachung sowie zugehöriges Verfahren
EP3985308A1 (fr) 2020-10-13 2022-04-20 ebm-papst Landshut GmbH Amplificateur de flamme destiné à la surveillance de flamme, ainsi que procédé associé

Also Published As

Publication number Publication date
EP2154430B1 (fr) 2015-09-30

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