EP3327351B1 - Procédé de fonctionnement d'un brûleur de gaz atmosphérique assisté par ventilateur - Google Patents

Procédé de fonctionnement d'un brûleur de gaz atmosphérique assisté par ventilateur Download PDF

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Publication number
EP3327351B1
EP3327351B1 EP16200264.6A EP16200264A EP3327351B1 EP 3327351 B1 EP3327351 B1 EP 3327351B1 EP 16200264 A EP16200264 A EP 16200264A EP 3327351 B1 EP3327351 B1 EP 3327351B1
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EP
European Patent Office
Prior art keywords
gas
fan
fan speed
valve
measurement signal
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EP16200264.6A
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German (de)
English (en)
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EP3327351A1 (fr
Inventor
Umberto Corti
Massimo CONTI
Marco Spelzini
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Garrett Motion SARL
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Honeywell Technologies SARL
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/26—Fail safe for clogging air inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed

Definitions

  • the present patent application relates to methods for operating a fan assisted, atmospheric gas burner appliance.
  • Gas burner appliances are differentiated between standard efficiency gas burner appliances and high efficiency gas burner appliances.
  • Standard efficiency (SE) gas burner appliances are also called fan assisted, atmospheric gas burner appliances.
  • High efficiency (HE) gas burner appliances are also called premix gas burner appliances.
  • the invention is related to fan assisted, atmospheric gas burner appliances only.
  • Fan assisted, atmospheric gas burner appliances comprise a burner chamber. A gas/air mixture can be combusted or burned within said burner chamber when the gas burner and thereby the gas/air mixture is ignited. Fan assisted, atmospheric gas burner appliances further comprise a heat exchanger for heating water by combusting or burning said gas/air mixture within said burner chamber. The water entering into the heat exchanger is often called return-flow water and the water exiting the heat exchanger is often called forward-flow water. Fan assisted, atmospheric gas burner appliances further comprise an air pipe or air duct for providing the air of the gas/air mixture, a gas pipe or gas duct for providing the gas of the gas/air mixture and an exhaust pipe or exhaust duct through which exhaust flowing out of the burner chamber can emerge into the ambient of the gas burner.
  • Fan assisted, atmospheric gas burner appliances also comprise a fan being assigned to the exhaust pipe or the air pipe and a gas valve being assigned to the gas pipe.
  • a fan being assigned to the exhaust pipe or the air pipe
  • a gas valve being assigned to the gas pipe.
  • the valve position of the gas valve is changed while the speed of the fan is kept constant or almost constant.
  • the gas supply pressure for a fan assisted, atmospheric gas burner appliance may be subject of disturbances. Specifically, the actual gas supply pressure may drop below a nominal gas supply pressure being necessary to ensure a stable operation of the fan assisted, atmospheric gas burner appliance. Further on, the operation of a fan assisted, atmospheric gas burner appliance may be disturbed by an obstructed exhaust pipe and/or an obstructed air pipe.
  • individual sensors are required to detect if the actual gas supply pressure corresponds to the nominal gas supply pressure and to detect if the exhaust pipe and/or the air pipe is obstructed.
  • gas pressure sensors assigned to the gas pipe are used to measure the actual gas supply pressure.
  • Air pressure switches are used to detect the flow through the exhaust pipe and thereby to determine if the exhaust pipe and/or air pipe is obstructed. The use of such sensors is adding costs to the appliance.
  • EP 2 447 609 B1 discloses a method for operating a fan assisted, atmospheric gas burner appliance.
  • a measurement signal of a temperature sensor measuring the exhaust temperature in combination with a measurement signal of an flame ionization sensor is used to determine the opening and/or closing status of the exhaust pipe and/or air pipe, whereby at a burner start up when the gas burner becomes ignited the fan is operated at maximum fan speed and a first exhaust temperature value is measured by said exhaust temperature sensor and a first ionization current value is measured by said flame ionization sensor, whereby after a defined time period the fan is operated at a lower fan speed and a second exhaust temperature value is measured by said exhaust temperature sensor and a second ionization current value is measured by said flame ionization sensor, and whereby when a difference between said first exhaust temperature value and said second exhaust temperature value and a difference between said first ionization current value and said second ionization current value are both relatively big or high, the exhaust pipe and/or air pipe is in a
  • novel methods for operating a fan assisted, atmospheric gas burner are provided, namely methods for checking the gas supply pressure and the status of the exhaust pipe on basis of one sensor signal only, namely on basis of the measurement signal of the flame ionization sensor.
  • a first method according to the present application is defined in the claim 1.
  • the fan speed of the fan will be decreased to a second fan speed, the valve position of the gas valve will be kept constant or almost constant and the change of the measurement signal of the flame ionization sensor will be monitored over a defined time period after the decrease of the fan speed. After said defined time period, the fan speed of the fan will be increased, the valve position of the gas valve will be decreased and the subsequent change measurement signal of the flame ionization sensor will be monitored.
  • the change of the measurement signal of the flame ionization sensor is smaller than a threshold after the decrease of the fan speed of the fan to the second fan speed, and if the subsequent change of the measurement signal of the flame ionization sensor is smaller than a threshold after the increase of the fan speed of the fan and the decrease of the valve position of the gas valve, an actual gas supply pressure in the gas pipe being smaller than a nominal gas supply pressure.
  • the change of the measurement signal of the flame ionization sensor is greater than the threshold after the decrease of the fan speed of the fan to the second fan speed, an actual gas supply pressure in the gas pipe corresponding to the nominal gas supply pressure and an unobstructed exhaust pipe and an unobstructed air pipe is detected.
  • a second method according to the present application is defined in the claim 2.
  • the fan speed of the fan will be decreased to a second fan speed, the valve position of the gas valve will be kept constant or almost constant and the change of the measurement signal of the flame ionization sensor will be monitored over a defined time period after the decrease of the fan speed. After said defined time period, the fan speed of the fan will be increased, the valve position of the gas valve will be decreased and the subsequent change measurement signal of the flame ionization sensor will be monitored.
  • the change of the measurement signal of the flame ionization sensor is smaller than a threshold after the decrease of the fan speed of the fan to the second fan speed, and if the subsequent change of the measurement signal of the flame ionization sensor is greater than a threshold after the increase of the fan speed of the fan and the decrease of the valve position of the gas valve, an obstructed exhaust pipe and/or obstructed air pipe is detected. If the change of the measurement signal of the flame ionization sensor is greater than the threshold after the decrease of the fan speed to the second fan speed, an actual gas supply pressure in the gas pipe corresponding to the nominal gas supply pressure and an unobstructed exhaust pipe and unobstructed air pipe is detected.
  • the methods provide a reliable way to determine the gas supply pressure and the status of the exhaust pipe using one sensor signal only, namely the measurement signal of the flame ionization sensor.
  • the change of the measurement signal of the flame ionization sensor is greater than the threshold after the decrease of the fan speed of the fan to the second fan speed, and if the subsequent change of the measurement signal of the flame ionization sensor is greater than a threshold after the increase of the fan speed of the fan and the decrease of the valve position of the gas valve, an actual gas supply pressure corresponding to the nominal gas supply pressure and an unobstructed exhaust pipe and an unobstructed air pipe is detected.
  • the methods according to the present invention provide a reliable way to determine the gas supply pressure and the status of the exhaust pipe on basis of one sensor signal only, namely on basis of the measurement signal of the flame ionization sensor.
  • the present invention relates to methods for operating a fan assisted, atmospheric gas burner appliance.
  • FIGS 1 and 2 show both a schematic drawing of a fan assisted, atmospheric gas burner appliance 10.
  • a fan assisted, atmospheric gas burner appliance is also called standard efficiency (SE) gas burner appliance.
  • SE standard efficiency
  • Such a fan assisted, atmospheric gas burner appliance 10 comprises a burner chamber 11 in which a gas/air mixture can be combusted or burned.
  • Such a fan assisted, atmospheric gas burner appliance 10 further comprises a heat exchanger 12 for heating water by combusting or burning said gas/air mixture.
  • Water 13 entering into the heat exchanger 12 is often called return-flow water 13 and water 14 exiting the heat exchanger 12 is often called forward-flow water 14.
  • Such a fan assisted, atmospheric gas burner appliance 10 further comprises an air pipe 15 or air duct for providing the air of the gas/air mixture, a gas pipe 16 or gas duct for providing the gas of the gas/air mixture and an exhaust pipe 17 or exhaust duct through which exhaust flowing out of said burner chamber 11 can emerge into the ambient of the gas burner 10 appliance.
  • a gas valve 18 is assigned the gas pipe 16 for adjusting the gas flow through the gas pipe 16.
  • the fan assisted, atmospheric gas burner appliance 10 further comprises a fan 19.
  • said fan 19 is assigned to the exhaust pipe 17.
  • said fan 19 is assigned to the air pipe 15. The combustion of the gas/air mixture within the burner chamber 11 results into flames 20.
  • the exhaust pipe 17 emerges preferably at a roof wall 22 of the burner chamber 11 from the same.
  • the exhaust pipe 17 is mounted to the burner chamber 11 at a flange or hock 23 of the roof wall 22.
  • a flame ionization sensor 24 of the fan assisted, atmospheric gas burner appliance 10 is positioned preferably within the burner chamber 11 in the region of the flames 20 originating when combusting the gas/air mixture.
  • the flame ionization sensor 24 provides as measurement signal an electrical current or electrical voltage which depends on the burner load.
  • the modulation of the burner load is effected by adjusting the valve position of the gas valve 19 while the fan speed of the fan 19 is kept constant or almost constant.
  • An almost constant fan speed means that the variation of the fan speed of the fan 19 is smaller than a defined threshold.
  • the actual gas supply pressure within the gas pipe 16 upstream of the gas valve 18 shall correspond to a nominal gas supply pressure. Further on, to ensure a stable operation of the fan assisted atmospheric gas burner appliance 10 the exhaust pipe 17 and the air pipe 15 shall both not be obstructed.
  • the methods according to the present invention provide a reliable way to determine the gas supply pressure and the status of the exhaust pipe on basis of one sensor signal only, namely on basis of the measurement signal of the flame ionization sensor 24.
  • the method detects an actual gas supply pressure in the gas pipe 16 being smaller than a nominal gas supply pressure or an obstructed exhaust pipe 17 and/or obstructed air pipe 15. However, if the change of the measurement signal of the flame ionization sensor 24 is greater than the threshold after the decrease of the fan speed of the fan 19 to the second fan speed, the method detects an actual gas supply pressure in the gas pipe 16 corresponding to the nominal gas supply pressure and an unobstructed exhaust pipe 17 and an unobstructed air pipe 15.
  • Figures 3 to 5 all show time curves of the signals 25, 26 and 27.
  • the signal 25 (dashed curve) is a fan speed signal illustrating over the time t the fan speed at which the fan 19 is running.
  • the signal 26 (dotted curve) is a valve position signal illustrating over the time t the valve position of the gas valve 18 and thereby the modulation of the burner load.
  • the signal 27 (dot-dashed curve) is the measurement signal provided by the flame ionization sensor 24 over the time t.
  • Figure 3 illustrates an exemplary operation status of the a fan assisted, atmospheric gas burner appliance 10 in which an actual gas supply pressure in the gas pipe 16 being smaller than a nominal gas supply pressure becomes detected.
  • a heat demand occurs at point of time t0 and the atmospheric gas burner appliance 10 becomes started up.
  • the fan 19 will be started so that the fan 19 runs with a first fan speed n1, preferably with maximum fan speed.
  • the gas valve 18 will be opened to a valve position x1 corresponding to a modulation of the burner loads required to fulfill the heat demand.
  • the gas burner and thereby the gas/air mixture becomes ignited so that the gas/air mixture will be combusted within the burner chamber 11.
  • the flames 20 resulting from that combustion cause that the flame ionization sensor 24 provides the measurement signal 27.
  • the fan 19 If during active combustion of the gas/air mixture the fan 19 is running at the first fan speed n1 and the valve position of the gas valve 16 is at the first valve position x1 corresponding to the modulation of the burner loads required to fulfill the heat demand, but the gas burner appliance 10 does not provide the required heat demand, e.g. by not providing the required forward-flow water temperature, the fan speed 25 of the fan 19 will be decreased at point of time t2 to a second fan speed n2 while the valve position of the gas valve 18 is kept constant or almost constant and the change of the measurement signal of the flame ionization sensor 24 will be monitored, preferably the change of the measurement signal compared with the value of the measurement signal at point of time t2 at which the fan speed becomes decreased.
  • An almost constant valve position of the gas valve 18 means that the variation of the valve position is smaller than a defined threshold.
  • the first fan speed n1 of the fan 19 is preferably the maximum fan speed.
  • the second fan speed n2 of the fan 19 is smaller than the first fan speed n1 but preferably larger than zero. However, depending from the gas burner appliance the second fan speed n2 can also be equal zero.
  • the second fan speed n2 of the fan 19 is in the range between 50% and 90%, preferably in the range between 60% and 80%, most preferably in the range between 65% and 75%, of the first fan speed n1.
  • the fan speed of the fan 19 will be increased at point of time t3 and at the same point of time t3 or immediately after the point of time t3 the valve position of the gas valve 18 will be decreased. Further on, the subsequent change measurement signal 27 of the flame ionization sensor 24 will be monitored, preferably the subsequent change of the measurement signal compared with the value of the measurement signal at point of time t3 at which the fan speed becomes increased and the valve position of the gas valve 18 becomes decreased.
  • the fan speed 25 of the fan 19 will preferably be increased back to the first fan speed n1 and the gas valve 18 will preferably be completely closed by changing the first valve position x1 to the second valve position x2.
  • the resulting subsequent change of measurement signal 27 from of the flame ionization sensor 24 will be monitored.
  • the valve position 26 of the gas valve 18 is changed back at point of time t4 to the first valve position x1.
  • the gas burner appliance is allowed for continued combustion because the combustion is not toxic with a CO content (e.g. 2000 ppm) within the exhaust gas smaller than a defined threshold.
  • the change of the measurement signal of the flame ionization sensor 24, preferably the change of the measurement signal compared with the value of the measurement signal at point of time t2 is smaller than the first threshold after the decrease of the fan speed of the fan 19 to the second fan speed
  • the subsequent change of the measurement signal of the flame ionization sensor 24, preferably the subsequent change of the measurement signal compared with the value of the measurement signal at point of time t3 is greater than the second threshold after the increase of the fan speed of the fan 19 and the decrease of the valve position of the gas valve 18 (see Figure 4 )
  • an obstructed exhaust pipe 19 and/or obstructed air pipe 15 is detected.
  • the valve position 26 of the gas valve 18 is kept at the completely closed position x2 and the fan speed 25 of the fan 19 is reduced to zero so that at point of time t4 to gas burner appliance 10 is shut down.
  • the gas burner appliance is not allowed for continued combustion because the combustion is toxic with a CO content within the exhaust gas greater than the defined threshold.
  • the second threshold corresponds preferably to the first threshold.
  • the methods according to the present invention are not based on the absolute magnitude of the measurement signal 27 of the flame ionization sensor 24 but on the change on the measurement signal 27 and thereby on the relative magnitude of the same.
  • the fan speed 25 of the fan 19 becomes preferably increased back to the first fan speed n1 and the gas valve becomes preferably completely closed at point of time t3.
  • the second threshold corresponds preferably to the first threshold.
  • Figure 5 illustrates an exemplary operation status of the fan assisted, atmospheric gas burner appliance 10 in which the actual gas supply pressure in the gas pipe 16 corresponds to the nominal gas supply pressure and in which further the exhaust pipe 17 and the air pipe 15 are both unobstructed.
  • the fan 19 will be started so that the fan 19 runs with a first fan speed n1, preferably with maximum fan speed. Then, at point of time t1 the gas valve 18 will be opened to a valve position x1 corresponding to the modulation of the gas burner required to fulfill the required heat demand.
  • the gas burner or gas/air mixture becomes ignited so that the gas/air mixture will be combusted within the burner chamber 11.
  • the flames 20 resulting from that combustion cause that the flame ionization sensor 24 provides the measurement signal 27.
  • the fan 19 If during active combustion of the gas/air mixture the fan 19 is running at the first fan speed n1 and the valve position of the gas valve 16 is at the first valve position x1 but the gas burner appliance 10 does not provide the required heat demand, e.g. by not providing the required forward-flow water temperature, the fan speed 25 of the fan 19 will be decreased at point of time t2 to a second fan speed n2 while the valve position of the gas valve 18 is kept constant or almost constant.
  • the change of the measurement signal of the flame ionization sensor 24 will be monitored, preferably the change of the measurement signal compared with the value of the measurement signal at point of time t2.
  • the change of the measurement signal 27 of the flame ionization sensor 24 after the decrease of the fan speed of the fan 19 to the second fan speed at point of time t2, preferably the change of the measurement signal compared with the value of the measurement signal at point of time t2, is greater than the first threshold. So, neither an actual gas supply pressure in the gas pipe 16 being smaller than a nominal gas supply pressure nor an obstructed exhaust pipe 17 nor an obstructed air pipe 15 becomes detected.
  • the fan speed of the fan 19 will be increased at point of time t3 and at the same point of time t3 or immediately after the point of time t3 the valve position of the gas valve 18 will be decreased. Further on, the subsequent change of the measurement signal 27 of the flame ionization sensor 24 will be monitored, preferably the subsequent change of the measurement signal compared with the value of the measurement signal at point of time t3.
  • the burner will be restarted or shut-down after a defined number of restarts.
  • the methods according to the present invention are performed during active combustion of the gas/air mixture serving a required heat demand if the fan 19 is running at a first fan speed, if the valve position of the gas valve 16 is a at first valve position depending from the required heat demand and if the gas burner appliance 10 does not provide the required heat demand by not providing a required nominal forward-flow water temperature of the heat exchanger 12.

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  • 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 (9)

  1. Procédé de fonctionnement d'un appareil brûleur à gaz atmosphérique assisté par ventilateur (10),
    ledit appareil brûleur à gaz (10) comprenant une chambre de brûleur (11) dans laquelle un mélange gaz/air peut être brûlé,
    ledit appareil brûleur à gaz (10) comprenant en outre un échangeur de chaleur (12) pour chauffer de l'eau en brûlant ledit mélange gaz/air,
    ledit appareil brûleur à gaz (10) comprenant en outre un tuyau d'air (15) ou un conduit d'air pour fournir l'air du mélange gaz/air, un tuyau de gaz (16) ou un conduit de gaz pour fournir le gaz du mélange gaz/air, et un tuyau d'échappement (17) ou un conduit d'échappement par lequel un échappement s'écoulant hors de ladite chambre de brûleur (11) peut sortir dans l'environnement ambiant de l'appareil brûleur à gaz,
    ledit appareil brûleur à gaz (10) comprenant en outre un ventilateur (19) affecté au tuyau d'échappement (17) ou au tuyau d'air (15) et un robinet de gaz (18) affecté au tuyau de gaz (16), la position de robinet du robinet de gaz (18) étant changée pour moduler la charge de brûleur,
    ledit appareil brûleur à gaz (10) comprenant en outre un capteur d'ionisation de flamme (24) fournissant un signal de mesure,
    dans lequel :
    pendant une combustion active du mélange gaz/air pendant que le ventilateur (19) fonctionne à une première vitesse de ventilateur et pendant que la position de robinet du robinet de gaz (18) est dans une première position de robinet, la vitesse de ventilateur du ventilateur (19) sera réduite à une seconde vitesse de ventilateur, la position de robinet du robinet de gaz (18) sera maintenue constante ou pratiquement constante, et le changement du signal de mesure du capteur d'ionisation de flamme (24) sera surveillé sur une période de temps définie après la réduction de la vitesse de ventilateur,
    après ladite période de temps définie, la vitesse de ventilateur du ventilateur (19) sera augmentée, la position de robinet du robinet de gaz (18) sera réduite et le changement suivant du signal de mesure du capteur d'ionisation de flamme (24) sera surveillé,
    si le changement du signal de mesure du capteur d'ionisation de flamme (24) est inférieur à un seuil après la réduction de la vitesse de ventilateur du ventilateur (19) à la seconde vitesse de ventilateur, et si le changement suivant du signal de mesure du capteur d'ionisation de flamme (24) est inférieur à un second seuil après l'augmentation de la vitesse de ventilateur du ventilateur (19) et la réduction de la position de robinet du robinet de gaz (18), une pression réelle d'alimentation en gaz dans le tuyau de gaz (16), inférieure à une pression nominale d'alimentation en gaz, est détectée,
    si le changement du signal de mesure du capteur d'ionisation de flamme (24) est supérieur au seuil après la réduction de la vitesse de ventilateur à la seconde vitesse de ventilateur, une pression réelle d'alimentation en gaz dans le tuyau de gaz (16), correspondant à la pression nominale d'alimentation en gaz, et un tuyau d'échappement non bouché (17) et un tuyau d'air non bouché (15) sont détectés.
  2. Procédé de fonctionnement d'un appareil brûleur à gaz atmosphérique assisté par ventilateur (10),
    ledit appareil brûleur à gaz (10) comprenant une chambre de brûleur (11) dans laquelle un mélange gaz/air peut être brûlé,
    ledit appareil brûleur à gaz (10) comprenant en outre un échangeur de chaleur (12) pour chauffer de l'eau en brûlant ledit mélange gaz/air,
    ledit appareil brûleur à gaz (10) comprenant en outre un tuyau d'air (15) ou un conduit d'air pour fournir l'air du mélange gaz/air, un tuyau de gaz (16) ou un conduit de gaz pour fournir le gaz du mélange gaz/air, et un tuyau d'échappement (17) ou un conduit d'échappement par lequel un échappement s'écoulant hors de ladite chambre de brûleur (11) peut sortir dans l'environnement ambiant de l'appareil brûleur à gaz,
    ledit appareil brûleur à gaz (10) comprenant en outre un ventilateur (19) affecté au tuyau d'échappement (17) ou au tuyau d'air (15) et un robinet de gaz (18) affecté au tuyau de gaz (16), la position de robinet du robinet de gaz (18) étant changée pour moduler la charge de brûleur,
    ledit appareil brûleur à gaz (10) comprenant en outre un capteur d'ionisation de flamme (24) fournissant un signal de mesure,
    dans lequel :
    pendant une combustion active du mélange gaz/air pendant que le ventilateur (19) fonctionne à une première vitesse de ventilateur et pendant que la position de robinet du robinet de gaz (18) est dans une première position de robinet, la vitesse de ventilateur du ventilateur (19) sera réduite à une seconde vitesse de ventilateur, la position de robinet du robinet de gaz (18) sera maintenue constante ou pratiquement constante, et le changement du signal de mesure du capteur d'ionisation de flamme (24) sera surveillé sur une période de temps définie après la réduction de la vitesse de ventilateur,
    après ladite période de temps définie, la vitesse de ventilateur du ventilateur (19) sera augmentée, la position de robinet du robinet de gaz (18) sera réduite et le changement suivant du signal de mesure du capteur d'ionisation de flamme (24) sera surveillé,
    si le changement du signal de mesure du capteur d'ionisation de flamme (24) est inférieur à un seuil après la réduction de la vitesse de ventilateur du ventilateur (19) à la seconde vitesse de ventilateur, et si le changement suivant du signal de mesure du capteur d'ionisation de flamme (24) est supérieur à un second seuil après l'augmentation de la vitesse de ventilateur du ventilateur (19) et la réduction de la position de robinet du robinet de gaz (18), un tuyau d'échappement bouché (17) et/ou un tuyau d'air bouché (15) sont détectés,
    si le changement du signal de mesure du capteur d'ionisation de flamme (24) est supérieur au seuil après la réduction de la vitesse de ventilateur à la seconde vitesse de ventilateur, une pression réelle d'alimentation en gaz dans le tuyau de gaz (16), correspondant à la pression nominale d'alimentation en gaz, et un tuyau d'échappement non bouché (17) et un tuyau d'air non bouché (15) sont détectés.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que si le changement du signal de mesure du capteur d'ionisation de flamme (24) est supérieur au seuil après la réduction de la vitesse de ventilateur du ventilateur (19) à la seconde vitesse de ventilateur, et si le changement suivant du signal de mesure du capteur d'ionisation de flamme (24) est supérieur au second seuil après l'augmentation de la vitesse de ventilateur du ventilateur (19) et la réduction de la position de robinet du robinet de gaz (18), une pression réelle d'alimentation en gaz, correspondant à la pression nominale d'alimentation en gaz, et un tuyau d'échappement non bouché et un tuyau d'air non bouché (15) sont détectés.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que, après ladite période de temps définie, la position de robinet du robinet de gaz (18) sera réduite de sorte que le robinet de gaz (18) sera complètement fermé.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que, après ladite période de temps définie, la vitesse de ventilateur du ventilateur (19) sera augmentée à la première vitesse de ventilateur.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la première vitesse de ventilateur du ventilateur (19) est la vitesse de ventilateur maximale, et la seconde vitesse de ventilateur du ventilateur (19) est de préférence supérieure à zéro.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la seconde vitesse de ventilateur du ventilateur (19) est dans la plage comprise entre 50 % et 90 %, de préférence dans la plage comprise entre 60 % et 80 %, plus préférablement dans la plage comprise entre 65 % et 75 %, de la première vitesse de ventilateur du ventilateur (19).
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la même procédure sera réalisée après chaque démarrage de brûleur.
  9. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la même procédure sera réalisée pendant une combustion active du mélange gaz/air en réponse à une demande de chaleur requise si l'appareil brûleur à gaz (10) ne répond pas à la demande de chaleur requise en ne fournissant pas une température nominale d'eau en écoulement direct de l'échangeur de chaleur (12).
EP16200264.6A 2016-11-23 2016-11-23 Procédé de fonctionnement d'un brûleur de gaz atmosphérique assisté par ventilateur Active EP3327351B1 (fr)

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CN113586500B (zh) * 2020-04-30 2023-06-20 芜湖美的厨卫电器制造有限公司 风机控制方法、控制器和热水器

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DE20221944U1 (de) * 2002-09-06 2009-08-20 Wolf Gmbh Vorrichtung zum Überwachen und Erkennen eines Betriebszustands bei Brennwertheizgeräten
EP2447609B1 (fr) 2010-11-02 2013-09-25 Honeywell Technologies Sarl Procédé de fonctionnement d'un brûleur de gaz atmosphérique assisté par ventilateur
DE102015206810A1 (de) * 2015-04-15 2016-10-20 Robert Bosch Gmbh Brennervorrichtung

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