EP3728950B1 - Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz - Google Patents

Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz Download PDF

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Publication number
EP3728950B1
EP3728950B1 EP17837993.9A EP17837993A EP3728950B1 EP 3728950 B1 EP3728950 B1 EP 3728950B1 EP 17837993 A EP17837993 A EP 17837993A EP 3728950 B1 EP3728950 B1 EP 3728950B1
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Prior art keywords
signal
vtr
voltage signal
generating
circuit
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EP17837993.9A
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German (de)
English (en)
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EP3728950A1 (fr
Inventor
Bruno Giordano
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Giordano Controls SpA
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Giordano Controls SpA
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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
    • F23N2223/42—Function generator
    • 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 device and method for the control and detection of the flame of a gas burner.
  • the present invention is used in atmospheric or pre-mixed burners.
  • the fuel is preferably gas, but it could be any combustible fuel in gaseous or liquid form (e.g. diesel oil, kerosene, etc.).
  • a possible use of the burner according to the present invention is in the field of boilers for heating/sanitary use and water heaters.
  • the present invention relates to the flame signal amplification circuit which is detected via an ionisation electrode inserted in a region where the flame is present.
  • This circuit is normally used for detecting the presence or not of the flame and/or the variation thereof over time so as to regulate the quantity of air and/or gas to be supplied to the burner.
  • a common control device for combustion of a burner comprises:
  • the comburent supply means preferably comprises a fan which supplies air.
  • the comburent preferably comprises air, but might include any other type of comburent different to air.
  • control unit has substantially two tasks:
  • an amplification circuit of the flame signal is used, generated by the ionisation electrode for the purpose of constantly monitoring the status of the flame.
  • the flame signal is usually a weak signal which is to be amplified.
  • amplification circuits There exist many known types of amplification circuits, all having in common the fact that a direct or alternating current is usually added to the flame signal, followed by an amplification stage (usually by an operational) and a filtering upstream of the amplification stage. Some examples of these systems are described in document US 9651255 or US 9062882 .
  • WO 2007/132484 discloses a control device for control and detection of a burner flame employing a flame rod.
  • the flame rod may be connected to a triangular type voltage signal.
  • the resulting signal passes a low pass filter to generate a duty cycle having a square wave output.
  • this type of circuit normally generates in output an analog signal which varies slowly with respect to the variation of the flame. Therefore, delays can be generated in the subsequent control of the supply of comburent/fuel.
  • this analog signal has a low resolution from which it is difficult to deduce how the flame is changing in real-time.
  • the object of the present invention is to realise a method and a device for controlling the combustion of a burner which obviates the above-cited drawbacks.
  • An aim of the present invention is to realise a device and method for control of the flame of a gas burner which is able to generate a flame signal with a reduced delay with respect to the variation of the flame. Additionally, an aim of the present invention is to realise a device and method for control of the flame of a gas burner which is able to generate a flame signal with a greater resolution.
  • the indicated aims are substantially attained by a method and a control device of the combustion of a burner according to what is described in the appended claims.
  • the appended figures illustrate an apparatus 100 for management of a burner 200 and a control device 1 for control of the flame of the burner 200.
  • figure 1 is an illustration of an apparatus 100 for managing a burner 200 comprising:
  • the apparatus 100 comprises a control device 1 having an ionisation electrode 2 and an amplifier 3, 7, 11 of the flame 300 ionisation signal deriving therefrom.
  • the apparatus 100 comprises a command unit 103 which manages the valve means 101, the regulating means 102 taking values from the control device 1 with the purpose of regulating the quantity of fuel and comburent and the relative ratio for maintaining a correct combustion and/or for monitoring the status of the flame 300.
  • the ionisation electrode 2 is arranged at a region in which the flame 300 of the burner 200 is present.
  • the ionisation electrode 2 is configured to generate an ionisation current Ion as a function of a status of the flame.
  • the ionisation electrode 2 is represented in figure 2 by a rectangular node.
  • the signal generated by the flame 300 is instead represented electrically by a resistance R and a diode D arranged in series.
  • the control device 1 comprises an electric circuit 3 for generating a triangular voltage signal Vtr having a triangle wave form.
  • the electric circuit has an input branch 3a connectable to a direct current source 4 (usually 24 Vdc) and an output branch 3b connected to the ionisation electrode 2 via the node 2a.
  • the circuit 3 for generating the triangular voltage signal Vtr preferably comprises a DC-DC voltage elevator 5 (preferably of the boost type) and a control group 6 of the triangular voltage signal Vtr, connected to one another so as to generate said triangular voltage signal Vtr.
  • the control group 6 is preferably realised as a feedback circuit for controlling the wave form of the triangular signal generated.
  • the DC-DC voltage elevator 5 is preferably configured to transform a voltage signal in input usually having a value of about 24 Volts in an output voltage signal having a value comprised between 100 Volts and 400 Volts (preferably 250 Vdc).
  • a capacitor C is interposed (upstream of the node 2a) between the circuit 3 for generating the triangular voltage signal Vtr and the ionisation electrode 2 so as to reduce or eliminate the direct component of the triangular voltage signal Vtr.
  • the triangular voltage signal Vtr is set to level "0" of the y axis ( figure 3a ) downstream of the node 2a.
  • the circuit 3 for generating a triangular voltage signal Vtr is connected to the ionisation electrode 2 in such a way that on varying the ionisation current Ion the average value of the triangular voltage signal Vtr also varies.
  • the presence of the flame 300 generates a current which modifies the average value of the triangular voltage signal Vtr by raising or lowering it with respect to level "0" of the y axis.
  • the device 1 comprises a first output circuit 7 connected downstream of the circuit 3 for generating the triangular voltage signal Vtr (and downstream of the capacitor C) and comprising a low-pass filter 8 for filtering said triangular voltage signal Vtr so as to obtain in output an analog signal 9 representing the average value of the triangular voltage signal (Vtr).
  • the first output circuit 7 preferably comprises a signal amplifier 10 configured to amplify said analog signal 9 as a function of the ionisation current Ion of the flame.
  • Said signal amplifier 10 is preferably arranged downstream of the low-pass filter 8.
  • the signal amplifier 10 preferably comprises at least one operational amplifier and/or a transistor amplifier group according to needs.
  • the first output circuit 7 advantageously enables obtaining an analog signal 9 in output which is relevant in regard to safety standard EN298. In fact, this signal enables determining, with certainty, the presence and the value of the ionisation signal of the flame signal.
  • the device 1 comprises a second output circuit 11 connected to the circuit 3 for generating the triangular voltage signal Vtr and comprising an electronic group 12 for generating a duty-cycle as a function of the triangular voltage signal Vtr.
  • the electronic group 12 for generating the duty-cycle is in particular configured to generate a square wave output signal 13 (or PWM) representing said duty-cycle wherein the amplitude of the square wave 13 is a function of the amplitude of the part of positive triangular voltage signal Vtr (greater than "0"). This signal enables a certain determination of whether the combustion is correct or not.
  • the second output circuit 11 substantially generates a digital signal which enables rapidly determining how the flame 300 is changing.
  • the displacement of the triangular wave form advantageously enables obtaining a rapid variation of the square wave signal 13 so as to obtain a rapid response to how the flame is changing.
  • Figures 3a-3b-3c include some examples in which:
  • the second output circuit 11 comprises a resistor R5 arranged in series with the electronic group 12 for generating the duty-cycle.
  • the first output circuit 7 and the second output circuit 11 are arranged in parallel to one another and said ionisation electrode 2 is arranged between the circuit for generating the triangular signal and the first 7 and second output circuit 11.
  • the first output circuit 7 is directly connected to the circuit for generating the triangular signal in order to receive said triangular voltage signal Vtr.
  • first output circuit 7 and the second output circuit 11 are connected to one another upstream of the low-pass filter 8 and the group 12 for generating the duty-cycle via a circuit branch comprising a resistor R3.
  • control unit 103 is operatively connected to the control device 1 to the valve means 101 and to the regulating means 102 and is configured to:
  • the command unit 103 is configured for comparing the contents of the analog 9 and square wave form 13 output signals so as the verify the uniformity of the data contained therein.
  • command unit 103 is configured to:
  • the present invention further relates to a method for the control and detection of the flame of a burner 200 which derives directly from what is described above in relation to the device 1 and the apparatus 100 which is referred to below.
  • the method includes receiving the ionising current Ion signal as a function of a status of the flame from said ionising electrode 2. Further, the method comprises a step of generating a triangular voltage signal Vtr having a triangle wave form by means of an electric circuit for generating connected to the ionisation electrode 2 in such a way that on varying the ionisation current Ion the average value of the triangular voltage signal Vtr also varies.
  • the method includes generating the analog output signal via a first output circuit 7 connected to the circuit 3 for generating the triangular voltage signal Vtr and comprising a low-pass filter 8 for filtering said triangular voltage signal Vtr so as to obtain in output said analog signal 9 representing the average value of the triangular voltage signal Vtr.
  • the method comprises a step of generating a square wave output signal 13 via the second output circuit 11 connected to the circuit 3 for generating the triangular voltage signal Vtr and comprising the electronic group 12 for generating a duty-cycle as a function of the triangular voltage signal Vtr wherein said square wave output signal 13 is representative of said duty-cycle.
  • the present invention obtains the following advantages.
  • the device and detecting and control method enable obtaining in output two signals (one analog and one digital) by means of which safety standard requirements can be satisfied (analog signal) and verifications can be performed on the flame with an improved resolution (digital signal) with respect to the prior art and with a larger-scale range.
  • the square wave form signal enables more reactively detecting the variations in the flame and therefore the combustion which take place in the burner.

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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)

Claims (12)

  1. Dispositif de commande (1) pour la commande et la détection de la flamme d'un brûleur (200), comprenant une électrode d'ionisation (2) configurée pour être disposée au niveau d'une région dans laquelle une flamme du brûleur (200) est présente ; ladite électrode d'ionisation (2) étant configurée pour générer un courant d'ionisation (Ion) en fonction d'un état de la flamme ;
    dans lequel il comprend :
    - un circuit électrique (3) pour générer un signal de tension triangulaire (Vtr) ayant une forme d'onde triangulaire et relié à l'électrode d'ionisation (2) de telle sorte que lors de la variation du courant d'ionisation (Ion), la valeur moyenne du signal de tension triangulaire (Vtr) varie également ;
    - un premier circuit de sortie (7) connecté au circuit (3) pour générer le signal de tension triangulaire (Vtr) et comprenant un filtre passe-bas (8) pour filtrer ledit signal de tension triangulaire (Vtr) de manière à obtenir en sortie un signal analogique (9) représentant la valeur moyenne du signal de tension triangulaire (Vtr) ;
    - un second circuit de sortie (11) connecté au circuit (3) pour générer le signal de tension triangulaire (Vtr) et comprenant un groupe électronique (12) pour générer un rapport cyclique en fonction du signal de tension triangulaire (Vtr) ; ledit groupe électronique (12) pour générer le rapport cyclique étant configuré pour générer un signal ayant un signal de sortie d'onde carrée (13) représentant ledit rapport cyclique.
  2. Dispositif de commande (1) selon la revendication 1, caractérisé en ce que le circuit (3) pour générer le signal de tension triangulaire (Vtr) comprend un élévateur de tension CDC-CC (5) et un groupe de commande (6) du signal de tension triangulaire (Vtr), connectés l'un à l'autre de manière à générer ledit signal de tension triangulaire (Vtr).
  3. Dispositif de commande (1) selon la revendication 2, caractérisé en ce que ledit élévateur de tension CC-CC (5) est configuré pour transformer un signal de tension à l'entrée ayant une valeur d'environ 24 Volts en un signal de tension de sortie ayant une valeur comprise entre 100 Volts et 400 Volts.
  4. Dispositif de commande (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un condensateur (C) est interposé entre le circuit (3) pour générer le signal de tension triangulaire (Vtr) et l'électrode d'ionisation (2) de manière à réduire la composante continue du signal de tension triangulaire (Vtr) .
  5. Dispositif de commande (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le premier circuit de sortie (7) comprend un amplificateur de signal (10) configuré pour amplifier ledit signal analogique (9) en fonction du courant d'ionisation (Ion) de la flamme.
  6. Dispositif (1) selon la revendication 5, caractérisé en ce que ledit amplificateur de signal (10) comprend au moins un amplificateur opérationnel et/ou un groupe d'amplificateurs à transistors.
  7. Dispositif de commande (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le deuxième circuit de sortie (11) comprend une résistance (R5) disposée en série avec le groupe électronique (12) pour générer le rapport cyclique.
  8. Dispositif de commande (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le premier circuit de sortie (7) et le deuxième circuit de sortie (11) sont disposés en parallèle l'un par rapport à l'autre et ladite électrode d'ionisation (2) est disposée entre le circuit pour générer le signal triangulaire et les premier (7) et deuxième (11) circuits de sortie ; ledit premier circuit de sortie (7) étant directement relié au circuit pour générer le signal triangulaire afin de recevoir ledit signal de tension triangulaire (Vtr).
  9. Dispositif de commande (1) selon la revendication 8, caractérisé en ce que le premier circuit de sortie (7) et le deuxième circuit de sortie (11) sont reliés l'un à l'autre en amont du filtre passe-bas (8) et du groupe (12) pour générer le rapport cyclique par l'intermédiaire d'une branche de circuit comprenant une résistance (R3).
  10. Appareil (100) pour gérer un brûleur (200), comprenant :
    des moyens de soupape (101) pour alimenter en combustible le brûleur (200) ;
    des moyens de régulation (102) du comburant pour fournir du comburant au brûleur (200) ;
    un dispositif de commande (1) selon l'une quelconque des revendications précédentes de 1 à 9 ;
    une unité de commande (103) reliée fonctionnellement au dispositif de commande (1), aux moyens de soupape (101) et aux moyens de régulation (102) et configuré pour :
    - recevoir ledit signal de sortie analogique (9) ;
    - recevoir ledit signal de sortie à onde carrée (13) ;
    - commander les moyens de soupape (101) et les moyens de régulation (102) selon le contenu desdits signaux en fonction d'un rapport carburant/comburant prédéfini de manière à assurer une combustion correcte.
  11. Appareil (100) selon la revendication 10, caractérisé en ce que l'unité de commande (103) est configurée pour :
    recevoir le signal de sortie analogique (9) et générer un signal d'alarme en fonction du contenu dudit signal de sortie analogique (9) ;
    recevoir ledit signal de sortie à onde carrée (13) et réguler les moyens de soupape (101) et les moyens de régulation (102) selon le contenu dudit signal de sortie (13) .
  12. Procédé pour la commande et la détection de la flamme d'un brûleur (200), dans lequel une électrode d'ionisation (2) est disposée au niveau d'une région dans laquelle ladite flamme est présente ; dans lequel il comprend les étapes opérationnelles suivantes :
    - recevoir un signal de courant d'ionisation (Ion) en fonction d'un état de la flamme à partir de ladite électrode d'ionisation (2) ;
    - générer un signal de tension triangulaire (Vtr) ayant une forme d'onde triangulaire au moyen d'un circuit électrique pour générer un signal de tension triangulaire relié à l'électrode d'ionisation (2) de telle sorte que lors de la variation du courant d'ionisation (Ion), la valeur moyenne du signal de tension triangulaire (Vtr) varie également ;
    - générer un signal de sortie analogique par l'intermédiaire d'un premier circuit de sortie (7) connecté au circuit (3) pour générer le signal de tension triangulaire (Vtr) et comprenant un filtre passe-bas (8) pour filtrer ledit signal de tension triangulaire (Vtr) de manière à obtenir en sortie ledit signal analogique (9) représentant la valeur moyenne du signal de tension triangulaire (Vtr) ;
    - générer un signal de sortie d'onde carrée (13) par l'intermédiaire d'un second circuit de sortie (11) connecté au circuit (3) pour générer le signal de tension triangulaire (Vtr) et comprenant un groupe électronique (12) pour générer un rapport cyclique en fonction du signal de tension triangulaire (Vtr) dans lequel ledit signal de sortie d'onde carrée (13) est représentatif dudit rapport cyclique.
EP17837993.9A 2017-12-21 2017-12-21 Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz Active EP3728950B1 (fr)

Applications Claiming Priority (1)

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PCT/IB2017/058264 WO2019122976A1 (fr) 2017-12-21 2017-12-21 Dispositif et procédé de régulation et de détection de flamme de brûleur à gaz

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EP3728950A1 EP3728950A1 (fr) 2020-10-28
EP3728950B1 true EP3728950B1 (fr) 2022-06-08

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KR (1) KR102422728B1 (fr)
WO (1) WO2019122976A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020108006A1 (de) * 2020-03-24 2021-09-30 Ebm-Papst Landshut Gmbh Schaltungsvorrichtung und Verfahren zum Überwachen einer Brennerflamme
EP4102135A1 (fr) 2021-06-11 2022-12-14 BDR Thermea Group B.V. Mécanisme de commande pour chaudière à gaz
DE102021118406A1 (de) * 2021-07-16 2023-01-19 Viessmann Climate Solutions Se Brennervorrichtung und Verfahren zum Betrieb einer Brennervorrichtung

Citations (2)

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Publication number Priority date Publication date Assignee Title
US20020004186A1 (en) * 2000-05-12 2002-01-10 Siemens Building Technologies Ag Measuring device for a flame
WO2007132484A1 (fr) * 2006-05-11 2007-11-22 Sit La Precisa S.P.A. Dispositif de mesure de l'intensité de la flamme

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Publication number Priority date Publication date Assignee Title
JPS55162535A (en) * 1979-06-06 1980-12-17 Sanden Corp Combustion control device
DE19502901C2 (de) * 1995-01-31 2000-02-24 Stiebel Eltron Gmbh & Co Kg Regeleinrichtung für einen Gasbrenner
EP2466204B1 (fr) * 2010-12-16 2013-11-13 Siemens Aktiengesellschaft Dispositif de réglage pour une installation de brûleur
ES2536128T3 (es) * 2011-03-03 2015-05-20 Siemens Aktiengesellschaft Instalación de quemador
ITPD20110261A1 (it) * 2011-08-03 2013-02-04 Sit La Precisa Spa Con Socio Unico Metodo e sistema di controllo di una unità valvolare modulante includente un elettromagnete

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020004186A1 (en) * 2000-05-12 2002-01-10 Siemens Building Technologies Ag Measuring device for a flame
WO2007132484A1 (fr) * 2006-05-11 2007-11-22 Sit La Precisa S.P.A. Dispositif de mesure de l'intensité de la flamme

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Publication number Publication date
EP3728950A1 (fr) 2020-10-28
KR102422728B1 (ko) 2022-07-19
KR20200097792A (ko) 2020-08-19
WO2019122976A1 (fr) 2019-06-27

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