EP3712501A1 - Procédé et dispositif de régénération d'une électrode pour une mesure d'ionisation dans une zone de flamme d'un brûleur - Google Patents

Procédé et dispositif de régénération d'une électrode pour une mesure d'ionisation dans une zone de flamme d'un brûleur Download PDF

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Publication number
EP3712501A1
EP3712501A1 EP20158669.0A EP20158669A EP3712501A1 EP 3712501 A1 EP3712501 A1 EP 3712501A1 EP 20158669 A EP20158669 A EP 20158669A EP 3712501 A1 EP3712501 A1 EP 3712501A1
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EP
European Patent Office
Prior art keywords
alternating current
frequency
burner
ionization
current source
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
EP20158669.0A
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German (de)
English (en)
Other versions
EP3712501B1 (fr
Inventor
Heinz-Jörg Tomczak
Sabrina Resch
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.)
Vaillant GmbH
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Vaillant GmbH
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Priority to PL20158669T priority Critical patent/PL3712501T3/pl
Publication of EP3712501A1 publication Critical patent/EP3712501A1/fr
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Publication of EP3712501B1 publication Critical patent/EP3712501B1/fr
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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
    • F23N5/00—Systems for controlling combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/18—Applying test signals, e.g. periodic
    • 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 invention relates to a method and a device for regenerating an electrode for measuring the ionization in a flame area of a burner, in particular a burner operated with a fuel gas and air. Such measurements can be used to control and regulate many devices, in particular for hot water preparation or heating, and must then deliver values that are as reliable as possible over long periods of time.
  • the basic structure of burners with measuring systems for ionization measurement and their use to control a burner are for example from the EP 0 770 824 B1 and the EP 2 466 204 B1 known. This is particularly about regulating the ratio of air to fuel gas, the so-called lambda value.
  • ionization electrodes used for measurement are subject to high thermal and / or corrosive loads. In the case of the ionization electrodes, special metallic alloys that also contain aluminum are usually used. When used during operation of the burner, over time this forms an aluminum oxide layer on the surface of the electrode, which protects against corrosion, but is electrically and thermally insulating.
  • One mechanical approach would be to make at least a portion of the ionization electrode made of a material, e.g. B. a nickel-tungsten alloy, which does not form an oxide layer under the conditions in the flame area.
  • a material e.g. B. a nickel-tungsten alloy
  • the object of the present invention is to at least partially solve the problems explained with reference to the prior art and, in particular, to create a method and a device which, in the case of an ionization electrode of any type, in particular also in the case of a conventional ionization electrode with aluminum content, regeneration and thus enable reliable measurement over long periods of time and in particular during cold start phases of a burner.
  • the method proposed here for regenerating an ionization electrode for a measurement of the ionization in a flame area of a burner with a first alternating voltage of a first frequency is applied after the burner has been started for a predeterminable time interval ⁇ t the ionization electrode with a second alternating voltage with a second frequency which is higher than the first frequency used for continuous operation.
  • the method could be carried out after each cold start, but it can be useful to carry out a regeneration only when certain predefinable criteria are reached. Since the application of the invention requires the presence of plasma in the area of the ionization electrode, the second alternating voltage with the second frequency should only be applied when the burner is running stably with its usual regulation of the lambda value after a cold start. Such cold starts are not very easy to carry out in terms of control technology, because a good signal is not always available from the ionization electrode, but they have already been controlled and / or regulated in a stable manner by using empirical values or similar measures. Suitable criteria for regeneration can e.g. B.
  • control electronics can be derived from conventional control electronics, for example, if a drift of the ionization electrode has exceeded a threshold value.
  • the burner is preferably restarted after a regeneration in order to enable the control electronics to be updated.
  • the second frequency of the second alternating voltage is preferably in the range from 10 to 100 MHz [megahertz], in particular in the range from 13.5 to 50 MHz.
  • the second alternating voltage is preferably in a range from 50 to 300 V [volts], particularly preferably between 100 and 200 V.
  • the first frequency of the first alternating voltage corresponds to the values suitable for such ionization measurements and is preferably in the range from 50 to 1000 Hz [Hertz], where the voltage is between 100 and 300 V [volts]. In particular, an alternating voltage of 170 V and 107 Hz has proven to be suitable.
  • a switching device which determines from sensor data or other data whether the burner is in a (predefined) cold or (predefined) warm state, and which only uses the ionization electrode when started in a determined warm state applied to the first alternating current of the first frequency.
  • the application of the second alternating voltage and the second frequency to the ionization electrode during the ionization measurement can be suppressed despite the presence of the predeterminable criteria. This avoids unnecessary effort during a warm start and the regeneration is made up at a suitable time.
  • An electronic module preferably evaluates the electrical current flowing through the ionization electrode and uses this measurement signal in a manner known per se to regulate the burner, specifically to regulate the air-to-fuel ratio (lambda value), in the case of a cold start a regulation and / or control is initially carried out until stable combustion is reached, is then replaced by a control for the predefinable time interval ⁇ t, and after the predefinable time interval ⁇ t, the first alternating current is regulated again at the first frequency.
  • a “control” is understood here in particular to mean that the lambda value is specified or set without the actual lambda value being taken into account.
  • a “regulation” is understood here in particular to mean that the lambda value is set, with this setting measuring the current ACTUAL lambda value on the basis of the ionization current and adjusting it to the predetermined target lambda value.
  • the predeterminable time interval ⁇ t is preferably in the range from 10 to 100 s [seconds], preferably from 20 to 30 s.
  • the second alternating voltage and second frequency are selected to be so high during the predeterminable time interval ⁇ t that the plasma generated by the combustion is additionally heated in the vicinity of the ionization electrode.
  • this leads to a reduction in the thickness of an oxide layer on the ionization electrode due to the impact of fast ions and, on the other hand, promotes the oxide layer cracking open or flaking off due to thermal effects, so that aging of the ionization electrode is at least partially reversed.
  • the object of the invention is also achieved by a device, in particular for carrying out the method described above.
  • a device for this purpose, there is an ionization electrode which is arranged in a burner in such a way that it can measure an ionization current in a flame area when the burner is in operation.
  • a switching device switches on the second alternating current source during operation according to specifiable criteria.
  • the second alternating current source is preferably set up for a frequency between 10 and 100 MHz, in particular for 13.5 to 50 MHz. Such a frequency range has proven to be suitable for rapid heating of the ionization electrode.
  • the first alternating current source is set up for a frequency between 50 and 1000 Hz and a voltage between 100 and 300 V.
  • the first AC power source must be cannot be distinguished from AC voltage sources for ionization measurements already known, but can also be designed differently through the additional use of the second current source.
  • the second alternating current source should preferably be set up for a second frequency and a second alternating voltage which are so high that the plasma in the vicinity of the ionization electrode is heated to excess temperature during operation. This is precisely why the use of the second alternating current source can develop its best effect.
  • an electronic module is preferably used to regulate the burner, which is set up for regulation by means of an ionization current determined during operation of the second alternating current source, this regulation being able to be switched off during operation of the second alternating current source and being replaced by a control system according to specifiable criteria.
  • the burner can be controlled for a short time according to empirical values, in which the ionization electrode is heated up and regenerated, while the usual regulation with the first alternating current for measuring the ionization is then resumed.
  • the switching device is preferably connected to sensors, for example temperature sensors and / or data sources of the electronic module, which enable a distinction between the cold and warm state of the burner, so that the second alternating current source cannot be switched on or blocked in the warm state.
  • sensors for example temperature sensors and / or data sources of the electronic module, which enable a distinction between the cold and warm state of the burner, so that the second alternating current source cannot be switched on or blocked in the warm state.
  • the switching device and / or the second alternating current source are preferably designed in such a way that the second alternating current source can only be switched on for a predefinable time interval ⁇ t of 10 to 100 s, preferably 20 to 30 s.
  • the first alternating current source and the second alternating current source can be formed by a single alternating voltage source which can be changed or switched in frequency and voltage, which does not change the other functions described.
  • FIG. 1 illustrates that a flame area 2 is formed in a burner 1 during operation, in which an ionization current is to be measured.
  • an ionization electrode 3 protrudes into the flame area 2.
  • a metallic component in the area where the fuel gas and air enters the burner 1 typically serves as the counter electrode 4.
  • the counter electrode 4 is typically electronically connected to ground.
  • Ionization electrode 3 and counterelectrode 4 are connected after a cold start with the presence of predefinable criteria with a second alternating current source 5, which supplies an alternating current of high frequency, which leads to rapid heating of the plasma in the Environment of the ionization electrode 3 and thus also the ionization electrode 3 itself leads.
  • a switching device 7 switches from the second alternating current source 5 again to a first alternating current source 6, which can correspond in terms of its properties to known alternating current sources for ionization measurements.
  • Their measurement signal can be fed via a measurement signal line 13 to an electronics module 10, which carries out a conventional control of the burner 1 with the measurement signal, which is now reliable.
  • Such a control typically takes place in that commands are given to actuators in an air inlet 11 and / or fuel gas inlet 12 via an actuating signal line, so that an optimal mixture of air and fuel gas is always supplied.
  • the switching device 7 is connected to at least one sensor 8 for determining the burner temperature and / or via a data line 9 to other data sources of the electronics module 10 in order to be able to decide whether a cold start is present or not.
  • This data line 9 can also be used in the event of a cold start in order to provide the electronics module 10 with the information that a cold start has been initiated and that the combustion process should therefore not be regulated by means of an ionization current, but rather briefly. Control based on empirical values is also carried out while the regeneration is being carried out by means of the second alternating current.
  • the present invention avoids malfunctions during cold starts of a burner due to measurement errors in the ionization current and enables regeneration of the ionization electrode through accelerated heating during a cold start at predeterminable time intervals and / or according to predeterminable criteria to ensure further interference-free control.

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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)
EP20158669.0A 2019-03-22 2020-02-21 Procédé et dispositif de régénération d'une électrode pour une mesure d'ionisation dans une zone de flamme d'un brûleur Active EP3712501B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL20158669T PL3712501T3 (pl) 2019-03-22 2020-02-21 Sposób i urządzenie do regeneracji elektrody do pomiaru jonizacji w obszarze płomienia palnika

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019107367.7A DE102019107367A1 (de) 2019-03-22 2019-03-22 Verfahren zum Prüfen des Vorhandenseins einer Rückschlagklappe in einer Heizungsanlage

Publications (2)

Publication Number Publication Date
EP3712501A1 true EP3712501A1 (fr) 2020-09-23
EP3712501B1 EP3712501B1 (fr) 2021-08-25

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EP20158669.0A Active EP3712501B1 (fr) 2019-03-22 2020-02-21 Procédé et dispositif de régénération d'une électrode pour une mesure d'ionisation dans une zone de flamme d'un brûleur

Country Status (5)

Country Link
EP (1) EP3712501B1 (fr)
CN (1) CN111720851A (fr)
DE (1) DE102019107367A1 (fr)
ES (1) ES2898392T3 (fr)
PL (1) PL3712501T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020127558B4 (de) 2020-10-20 2023-06-29 Viessmann Climate Solutions Se Heizungsanlage und Verfahren zum Betreiben einer Heizungsanlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0770824B1 (fr) 1995-10-25 2000-01-26 STIEBEL ELTRON GmbH & Co. KG Procédé et circuit pour commander un brûleur à gaz
US20060257801A1 (en) * 2005-05-12 2006-11-16 Honeywell International Inc. Leakage detection and compensation system
EP2357410A2 (fr) * 2010-01-28 2011-08-17 Viessmann Werke GmbH & Co KG Procédé et dispositif de détection de flammes basés sur une mesure du courant d'ionisation
EP2466204B1 (fr) 2010-12-16 2013-11-13 Siemens Aktiengesellschaft Dispositif de réglage pour une installation de brûleur
DE102017118095A1 (de) * 2017-08-09 2019-02-14 Vaillant Gmbh Vorrichtung und Verfahren zur Zündung und Flammenerkennung für einen brenngasbetriebenen Brenner
WO2020020494A1 (fr) * 2018-07-27 2020-01-30 Ebm-Papst Landshut Gmbh Procédé pour la surveillance et le réglage d'une flamme de brûleur d'un brûleur d'appareil de chauffage

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524614A1 (fr) * 1982-04-02 1983-10-07 Radiotechnique Compelec Procede utilisant l'effet redresseur d'une flamme pour surveiller la marche d'un bruleur, et dispositif pour mettre en oeuvre ce procede
AT403955B (de) * 1995-10-16 1998-07-27 Vaillant Gmbh Heizgerät mit einem brenner
ATE202837T1 (de) * 1996-05-09 2001-07-15 Stiebel Eltron Gmbh & Co Kg Verfahren zum betrieb eines gasbrenners
DE19947181B4 (de) * 1999-10-01 2005-03-17 Gaswärme-Institut eV Verfahren zur Bestimmung eines für die aktuelle Luftzahl repräsentativen Signals
US20050150218A1 (en) * 2004-01-13 2005-07-14 Crawley Wilbur H. Method and apparatus for determining accumulation in a particulate filter of an emission abatement assembly
DE102005012388B4 (de) * 2005-03-17 2007-09-20 Beru Ag Verfahren zum Erfassen des Vorliegens einer Flamme im Brennraum eines Brenners und Zündvorrichtung für einen Brenner
DE102008028423B4 (de) * 2008-06-17 2012-02-09 Viessmann Werke Gmbh & Co Kg Verfahren und Vorrichtung zur Bestimmung von mindestens einer Einflussgröße eines Verbrennungsprozesses
DE102012023450B4 (de) * 2012-11-30 2018-12-20 Sebastian Stein Verfahren zur Regelung der Verbrennung von Feststoffen in einer Feuerungsanlage
DE102012023451A1 (de) * 2012-11-30 2014-06-05 Sebastian Stein Feuerungsanlage zum Verbrennen von Festbrenstoffen, insbesondere von Holz sowie Vorrichtung und Verfahren zur Bestimmung der Verbrennungsintensität der Flamme
US9006690B2 (en) * 2013-05-03 2015-04-14 Axcelis Technologies, Inc. Extraction electrode assembly voltage modulation in an ion implantation system
CN103615798A (zh) * 2013-11-04 2014-03-05 广东万和新电气股份有限公司 全预混燃烧燃气采暖热水炉

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0770824B1 (fr) 1995-10-25 2000-01-26 STIEBEL ELTRON GmbH & Co. KG Procédé et circuit pour commander un brûleur à gaz
US20060257801A1 (en) * 2005-05-12 2006-11-16 Honeywell International Inc. Leakage detection and compensation system
EP2357410A2 (fr) * 2010-01-28 2011-08-17 Viessmann Werke GmbH & Co KG Procédé et dispositif de détection de flammes basés sur une mesure du courant d'ionisation
EP2466204B1 (fr) 2010-12-16 2013-11-13 Siemens Aktiengesellschaft Dispositif de réglage pour une installation de brûleur
DE102017118095A1 (de) * 2017-08-09 2019-02-14 Vaillant Gmbh Vorrichtung und Verfahren zur Zündung und Flammenerkennung für einen brenngasbetriebenen Brenner
WO2020020494A1 (fr) * 2018-07-27 2020-01-30 Ebm-Papst Landshut Gmbh Procédé pour la surveillance et le réglage d'une flamme de brûleur d'un brûleur d'appareil de chauffage

Also Published As

Publication number Publication date
CN111720851A (zh) 2020-09-29
EP3712501B1 (fr) 2021-08-25
DE102019107367A1 (de) 2020-09-24
PL3712501T3 (pl) 2022-01-17
ES2898392T3 (es) 2022-03-07

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