EP3763997B1 - Procédé de fonctionnement d'un brûleur à ventilateur - Google Patents

Procédé de fonctionnement d'un brûleur à ventilateur Download PDF

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Publication number
EP3763997B1
EP3763997B1 EP20184944.5A EP20184944A EP3763997B1 EP 3763997 B1 EP3763997 B1 EP 3763997B1 EP 20184944 A EP20184944 A EP 20184944A EP 3763997 B1 EP3763997 B1 EP 3763997B1
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EP
European Patent Office
Prior art keywords
flow
blower
forced
flow sensor
air burner
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.)
Active
Application number
EP20184944.5A
Other languages
German (de)
English (en)
Other versions
EP3763997A1 (fr
EP3763997B8 (fr
Inventor
Sebastian Hack
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.)
Viessmann Climate Solutions SE
Original Assignee
Viessmann Werke GmbH and Co KG
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.)
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Publication date
Application filed by Viessmann Werke GmbH and Co KG filed Critical Viessmann Werke GmbH and Co KG
Publication of EP3763997A1 publication Critical patent/EP3763997A1/fr
Publication of EP3763997B1 publication Critical patent/EP3763997B1/fr
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Publication of EP3763997B8 publication Critical patent/EP3763997B8/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L3/00—Arrangements of valves or dampers before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake

Definitions

  • the invention relates to a method for operating a forced-air burner according to the preamble of patent claim 1.
  • a method of operating a forced draft burner is known from patent document DE 10 2017 110 314 A1 known.
  • a fluid medium is supplied to the forced-air burner with a blower through a flow guide.
  • a flow in the flow guide is quantitatively detected with a flow sensor.
  • a non-return device which is not explicitly disclosed in this document, but from the patent document DE 10 2016 203 628 A1 is known per se, prevents a backflow in the flow guide against the conveying direction of the fan.
  • the EP 2623865 A1 discloses a method of operating a forced draft burner.
  • a backflow is detected by evaluating the signals from a flow sensor.
  • a backflow can be prevented by the slow operation of the fan, so that a mechanical backflow safety device can be dispensed with.
  • the object of the invention is to improve a method for operating a forced-air burner of the type mentioned at the outset.
  • a method for operating a forced-air burner is to be created with which a defective backflow protection device can be reliably detected.
  • the method according to the invention is characterized in that in a phase when the burner is switched off when the fan starts up, it is observed whether there is a flow reversal in the flow control, which can be metrologically recognized by the fact that the measured value of the flow, more typically The way the resistance of a heating wire (a more detailed explanation of this follows below) initially decreases in terms of amount. If this is the case, this means that the flow through the backflow protection device is in an undesirable direction and is therefore obviously not working properly.
  • a fluid medium is supplied to the forced-air burner with a blower 1 through a flow guide 2 . Furthermore, a flow in the flow guide 2 is quantitatively detected with a flow sensor 3 , and a backflow in the flow guide 2 counter to the conveying direction of the blower 1 is also prevented with a backflow protection device 4 .
  • a flow flowing in the direction of the fan 1 can (or will) also be measured with the flow sensor 3 .
  • What is essential for the method according to the invention is that in a phase when the blower 1 is switched off, but in which the flow sensor 3 nevertheless detects a flow above a predetermined absolute value (see A in figure 2 ) is determined, to determine a defect in the backflow protection device 4, the blower 1 is started (see B in figure 2 ), and that a signal is then generated when the amount of flow detected by the flow sensor 3 decreases at least initially during this starting of the fan 1 .
  • a defective backflow safety device 4 is obviously present when the flow from the forced-air burner to the blower 1 flows or can flow.
  • the speed of the blower 1 is increased continuously during the test.
  • a speed range of around 1000 rpm to 4000 rpm is run through ( figure 2 ultimately only shows the setpoint signal for fan 1, namely "on” or "off”).
  • the fan 1 builds up an increasing pressure as it slowly runs up, which eventually builds up the pressure equilibrium in the event of a reverse flow; at this moment the mass flow drops to the minimum.
  • the mass flow increases continuously as the fan speed increases.
  • the forced-air burner is preferably switched off after a predefined number of signals reporting a defect in the backflow protection device 4, preferably three signals generated in succession. It is also particularly preferably provided that the blower burner in a signal-related shutdown to restart from a must be unlocked by a specialist via the device control.
  • the method according to the invention is particularly advantageous when--as in a so-called cascade or multiple occupancy--several heaters connected to one another via their exhaust gas ducts, each with a forced-air burner, are operated as required.
  • each heater is monitored with its own flow sensor 3 in order to ensure that no exhaust gas from a running heater reaches the installation room of the switched-off heater via a defective backflow protection device 4 of a heater that is on standby at this moment and there causes problems.
  • the flow successively flows through an inlet section 2.1 belonging to the flow guide 2, the blower 1, the backflow protection device 4 and an end section 2.2 leading to the forced-air burner and also belonging to the flow guide 2.
  • the flow sensor 3 is preferably located, as shown, at the end of the inlet section 2.1 just before the fan 1. Depending on whether fuel has already been added to the air at this point, it is further preferred that the flow sensor 3 controls the flow optionally one mixture of air and combustion gas or only air is monitored.
  • a heating wire provided on the flow sensor 3 is used for flow measurement.
  • the measuring principle of the flow sensor 3, more precisely the mass flow sensor is based on the change in the electrical resistance of a piece of wire a few millimeters long due to the heat dissipation of the passing air flow. It corresponds to that of a hot wire probe.
  • a defined current is sent through the wire, and the resistance is determined by evaluating the voltage drop.
  • the volume flow sensor uses a characteristic curve to allocate a mass flow to the voltage drop. Since the heat dissipation is evaluated to measure the mass flow, the measured value is independent of the direction of the air flow.

Landscapes

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

Claims (10)

  1. Procédé opérationnel d'un brûleur à air soufflé, à l'aide d'une soufflante (1), un milieu fluide étant alimenté vers le brûleur à air soufflé via un guidage de flux (2), à l'aide d'un capteur de débit (3), un flux étant détecté quantitativement dans le guidage de flux (2), à l'aide d'un système de sécurité anti-reflux (4), un reflux à l'encontre de la direction de convoyage de la soufflante (1) étant empêché dans le guidage de flux (2),
    caractérisé en ce que
    dans une phase, alors que la soufflante (1) est hors service, mais lors de laquelle toutefois le capteur de débit (3) détermine un flux dépassant une valeur du montant prédéfinie, pour rechercher un défaut sur le système de sécurité anti-reflux (4), la soufflante (1) est démarrée et en ce qu'il est alors généré un signal si lors dudit démarrage de la soufflante (1), le flux détecté par le capteur de débit (3) décroît au moins au début au niveau de son montant.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le signal est généré lorsque le flux décroît au niveau de son montant de plus de 30 % de la valeur du montant prédéfinie dans les dix premières secondes après le démarrage de la soufflante (1).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    dans des intervalles réguliers, il est déterminé si on est en présence d'un défaut du système de sécurité anti-reflux (4).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce
    qu'après un nombre prédéfini de signaux, le brûleur à air soufflé est mis à l'arrêt.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que
    lors d'une mise à l'arrêt due à des signaux, pour sa remise en route, le brûleur à air soufflé doit être déverrouillé par une personne habilitée.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que
    plusieurs appareils chauffants, reliés les uns aux autres par l'intermédiaire de leurs canaux d'échappement sont commandés au besoin par chacun un brûleur à air soufflé et en ce que chaque appareil chauffant est supervisé par un propre capteur de débit (3).
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que
    lorsque la soufflante (1) fonctionne en mode stationnaire, un flux circulant dans la direction de la soufflante (1) est mesuré à l'aide du capteur de débit (3).
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que
    le flux traverse successivement un segment d'entrée (2.1) qui fait partie du guidage de flux (2), la soufflante (1), le système de sécurité anti-reflux (4) et un segment d'extrémité (2.2) menant vers le brûleur à air soufflé et faisant également partie du guidage de flux (2).
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que
    pour mesurer le flux, l'on utilise un filament chauffant prévu sur le capteur de débit (3).
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce
    qu'à l'aide d'un capteur de débit (3), l'on supervise au choix le débit d'un mélange d'air et de gaz de combustion ou uniquement d'air.
EP20184944.5A 2019-07-11 2020-07-09 Procédé de fonctionnement d'un brûleur à ventilateur Active EP3763997B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019118764.8A DE102019118764A1 (de) 2019-07-11 2019-07-11 Verfahren zum Betrieb eines Gebläsebrenners

Publications (3)

Publication Number Publication Date
EP3763997A1 EP3763997A1 (fr) 2021-01-13
EP3763997B1 true EP3763997B1 (fr) 2022-01-19
EP3763997B8 EP3763997B8 (fr) 2022-03-02

Family

ID=71575001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20184944.5A Active EP3763997B8 (fr) 2019-07-11 2020-07-09 Procédé de fonctionnement d'un brûleur à ventilateur

Country Status (2)

Country Link
EP (1) EP3763997B8 (fr)
DE (1) DE102019118764A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2623865B1 (fr) * 2012-02-03 2020-04-08 Honeywell Technologies Sarl Brûleur à gaz, procédé de fonctionnement associé et système de brûleur à gaz multiples
EP3026342B1 (fr) * 2013-07-22 2019-08-28 Rinnai Corporation Dispositif de combustion composite
JP6529364B2 (ja) * 2015-07-09 2019-06-12 リンナイ株式会社 給湯器
DE102016203628A1 (de) * 2016-03-07 2017-09-07 Vaillant Gmbh Rückströmsicherungsventil für ein Gebläse einer Gasarmatur
DE102017110314A1 (de) * 2017-05-12 2018-04-26 Viessmann Werke Gmbh & Co Kg Anlage zur Bereitstellung von Wärme und Strom und Verfahren zum Betrieb einer solchen Anlage

Also Published As

Publication number Publication date
DE102019118764A1 (de) 2021-01-14
EP3763997A1 (fr) 2021-01-13
EP3763997B8 (fr) 2022-03-02

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