EP2685168B1 - Method for operating a gas burner - Google Patents
Method for operating a gas burner Download PDFInfo
- Publication number
- EP2685168B1 EP2685168B1 EP12176353.6A EP12176353A EP2685168B1 EP 2685168 B1 EP2685168 B1 EP 2685168B1 EP 12176353 A EP12176353 A EP 12176353A EP 2685168 B1 EP2685168 B1 EP 2685168B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- air
- burner
- air mixture
- mixing ratio
- 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
Links
- 238000000034 method Methods 0.000 title claims description 11
- 239000000203 mixture Substances 0.000 claims description 68
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
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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
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
Definitions
- the present patent application relates to a method for operating a gas burner.
- EP 1 084 369 B1 and EP 1 179 159 B1 each disclose a method for operating a gas burner.
- a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber of the gas burner.
- the gas/air mixture is provided by mixing an air flow provided by an air duct with a gas flow provided by a gas duct using a mixing device.
- the quantity of the air flow is adjusted by a fan.
- the defined mixing ratio of the gas/air mixture is controlled by a controller on basis of a signal provided by an electrical or electronic sensor.
- the electrical or electronic sensor is coupled to the gas duct and to the air duct.
- the electrical or electronic sensor is coupled to the gas duct and to a reference point.
- the electrical or electronic sensor is especially designed as a flow-meter.
- An actual value corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure in the air duct or corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure at the reference point is provided by the electrical or electronic sensor, wherein this actual value is compared with a nominal value.
- a control variable for a gas valve assigned to the gas duct is generated on basis of the control deviation between the actual value and nominal value, wherein the gas valve is adjusted on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
- the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner.
- the mixing ratio of the gas/air mixture is kept constant over the entire fan speed range of the fan, either to provide a 1:1 gas-air control having a ratio between the gas pressure and the air pressure of 1:1 over the entire modulation range of the gas burner or to provide a 1:N (N>1) gas-air control having a ratio between the gas pressure and the air pressure of 1:N over the entire modulation range of the gas burner.
- a so-called ⁇ -value is usually greater than 1.
- DE 101 14 901 A1 discloses a method for operating a gas burner in which a controller uses signals provided by two mass flow sensors and a signal provided by a viscosity sensor to generate an output signal for a fan.
- the controller determines a certain fan speed for the fan on basis of the signals of these three sensors in order to control ⁇ .
- the novel method for operating a gas burner provides over the entire modulation range of the gas burner an optimized mixing ratio of the gas/air mixture, whereby the variation and thereby optimization of the mixing ratio of the gas/air mixture as a function of the fan speed is allowed only if the operating conditions of the gas burner are good enough. This results into a very stable operation of the gas burner.
- FIG. 1 shows a schematic view of a gas burner 10.
- the gas burner 10 comprises a burner chamber 11 in which combustion of a gas/air mixture takes place during burner-on phases of the gas burner 10.
- the combustion of the gas/air mixture results into flames 12 monitored by e.g. a flame ionization sensor 13.
- the flame ionization sensor 13 is an optional component of the gas burner 10.
- the gas/air mixture is provided to the burner chamber 11 of the gas burner 10 by mixing an air flow with a gas flow.
- a fan 14 sucks in air flowing through an air duct 15 and gas flowing though a gas duct 16.
- a gas valve 17 for adjusting the gas flow through the gas duct 16 and a safety valve 18 are assigned to the gas duct 16. The position of the gas valve 17 is adjusted by a pressure regulator 19.
- the gas/air mixture having a defined mixing ratio of gas and air is provided to the burner chamber 11 of the gas burner 10.
- the gas/air mixture is provided by mixing the air flow provided by an air duct 15 with a gas flow provided by a gas duct 16.
- the air flow and the gas flow become preferably mixed by a mixing device.
- a mixing device can be designed as a Venturi nozzle (not shown).
- the quantity of the air flow and thereby the quantity of the gas/air mixture flow is adjusted by the fan 14, namely by the speed of the fan 14.
- the fan speed can be adjusted by an actuator 22 of the fan 14.
- the defined mixing ratio of the gas/air mixture is controlled by a controller 20 on basis of a signal provided by an electrical or electronic sensor 23.
- the electrical or electronic sensor 23 is coupled to the gas duct 16 and to a reference point 24.
- the electrical or electronic sensor 23 is preferably designed as a flow-meter.
- An actual value corresponding to a pressure ratio between the gas pressure in the gas duct 16 and the air pressure at the reference point 24 is provided by the electrical or electronic sensor 23. This actual value is compared by the controller 20 with a nominal value stored in the controller 20.
- the controller 20 generates a control variable for the gas valve 17, namely for an actuator 21 of the gas valve 17, on basis of the control deviation between the actual value provided by the electrical or electronic sensor 23 and the nominal value stored in the controller 20.
- the gas valve position of the gas valve 17 is adjusted by the actuator 21 of the same on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture.
- the flames 12 resulting form the combustion of the gas/air mixture are used to heat a heat exchanger 25 positioned in the burner chamber 11.
- a temperature sensor 26 is used to measure a temperature of the heat exchanger 25, especially a temperature of water flowing through the heat exchanger 25.
- Exhaust gas resulting from the combustion of the gas/air mixture can exit from the burner chamber 11 though an exhaust pipe 28.
- An exhaust gas sensor 27 assigned to the exhaust pipe 28 can be used to analyze the emissions of the exhaust gas, especially NOx emissions of the same.
- the exhaust gas sensor 27 is an optional component of the gas burner 10.
- the mixing ratio of gas and air of the gas/air mixture provided to the burner chamber 11 is not kept constant over the modulation range of the gas burner.
- the mixing ratio of gas and air of the gas/air mixture provided to the burner chamber 11 is changed as a function on the speed of the fan 14.
- a gas/air mixture having a mixing ratio of gas and air adapted to provide a stable combustion, especially a stable and secure ignition, of the gas/air mixture.
- a gas/air mixture having a mixing ratio of gas and air is provided resulting in a combustion with an almost constant output of the flame ionization sensor 13 or alternatively with an almost constant output of the exhaust gas sensor 27.
- a gas/air mixture having a mixing ratio of gas and air adapted to provide a combustion with reduced emissions.
- a gas/air mixture having a mixing ratio of gas and air is provided resulting in a combustion with an output of the exhaust gas sensor 27 being smaller that an emission threshold.
- the mixing ratio of gas and air of the gas/air mixture is freely adjustable as a function of the fan speed of the fan 14. It is possible to use intermediate thresholds between the upper threshold and the lower threshold in order divide this fan speed range into sub-ranges.
- a gas/air mixture is provided being leaner than the gas/air mixture which is provided for fan speeds of the fan 14 being larger than the upper threshold.
- a gas/air mixture is provided being leaner than the gas/air mixture which is provided for fan speeds of the fan 14 being smaller than the lower threshold.
- a gas/air mixture is provided being preferably leaner than the gas/air mixture of the fan 14 which is provided for fan speeds being larger than the upper threshold.
- a gas/air mixture is provided being richer than the gas/air mixture of the fan 14 which is provided for fan speeds being larger than the upper threshold. It is also possible that for fan speeds being smaller than the lower thresholds a gas/air mixture is provided having the same mixing ratio of gas and air than the gas/air mixture which is provided for fan speeds being larger than the upper threshold.
- a 1:1 gas-air control having a ratio between the gas pressure and the air pressure of 1:1 is provided.
- a 1:N (N>1) gas-air control having a ratio between the gas pressure and the air pressure of 1:N is provided.
- the second section of the modulation range can be divided into subsections by e.g. intermediate thresholds.
- the controller 20 As a function of on the fan speed of the fan 14 the controller 20 generates an offset value which becomes added to the nominal value for the signal provided by the electrical or electronic sensor 23.
- the controller 20 As a function on the fan speed of the fan 14 the controller 20 generates an offset value which becomes added to control variable for a gas valve 17.
- the respective offset value which is a function of the fan speed and which is stored in the controller 20 is freely programmable as a function of the fan speed.
- the controller 20 blocks the above variation of the mixing ratio of the gas/air mixture as a function of the speed of the fan 14.
- the variation of the mixing ratio of the gas/air mixture is only allowed if the heat exchanger temperature measured by the temperature sensor 26 is greater than a temperature threshold. If the temperature of the heat exchanger 25 is below the temperature threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner 10 and thereby over the entire fan speed range of the fan 14. However, if the temperature of the heat exchanger 25 is above the temperature threshold, the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of the gas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above.
- the variation of the mixing ratio of the gas/air mixture is only allowed if the gas burner 10 has been operated with a defined load for at least a defined time period, especially if the burner load has been greater than a burner load threshold for a time period being greater than a time threshold. If the burner load is below the burner load threshold and/or if the time period is below the time threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner 10 and thereby over the entire fan speed range. However, if the burner load is above the burner load threshold and if the time period is above the time threshold the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of the gas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above.
- the variation of the mixing ratio of the gas/air mixture is only allowed if the fan speed is stable, namely if the variation of the fan speed is lower than a variation threshold for a time period being greater than a time threshold. If the variation of the fan speed is above the variation threshold and/or if the time period is below the time threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner 10 and thereby over the entire fan speed range. However, if the variation of the fan speed is below the variation threshold and if the time period is above the time threshold the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of the gas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above.
- the controller 20 generates a control variable for the gas valve 17, namely for an actuator 21 of the gas valve 17.
- the actuator 21 of the gas valve 17 can be a stepper motor.
- the controller 20 preferably checks the function of the electrical or electronic sensor 23, especially the gain of the electrical or electronic sensor 23.
- the controller 17 In order to check the function of the electrical or electronic sensor 23, the controller 17 generates an input variable for the actuator 21 by which the actuator 21 and thereby the gas valve 17 become adjusted by a defined degree or amount. If the actuator 21 is a stepper motor, the controller 20 generates an input variable for the stepper motor by which stepper motor is operated over a defined number of steps.
- the output signal provided by electrical or electronic sensor 23 in response to this operation of the actuator 21 and thereby gas valve 17 is compared by the controller 20 with a nominal output signal expected in response to this operation of the actuator 21. If a deviation between actual output signal of the electrical or electronic sensor 23 and the nominal output signal is greater than a threshold, the controller 20 determines an improper function of the electrical or electronic sensor 23, especially a non tolerable change of the sensor gain of the electrical or electronic sensor 23. If the deviation between actual output signal of the electrical or electronic sensor 23 and the nominal output signal is smaller than the threshold, the controller 20 determines a proper function of the electrical or electronic sensor 23, especially a tolerable change of the sensor gain of the electrical or electronic sensor 23 or no change of the sensor gain.
- controller 20 determines an improper function of the electrical or electronic sensor 23, especially a non tolerable change of the sensor gain of the electrical or electronic sensor 23, the controller 20 preferably initiates at least one defined action.
- controller 20 blocks the above variation of the mixing ratio of the gas/air mixture provided to the burner chamber 11 as a function of the speed of the fan 14. Only if the controller 20 determines a proper function of the electrical or electronic sensor 23, the controller 20 will allow the variation of the mixing ratio of the gas/air mixture as a function of the speed of the fan 14.
- controller 20 In preferred actions initiated by the controller 20 in response to a detected improper function of the electrical or electronic sensor 23 are that the controller 20 generates a service signal indicating that the burner should be inspected by a service person, and/or that the controller 20 performs a calibration for the sensor gain of the electrical or electronic sensor 23, and/or that the controller 20 performs a compensation for the sensor gain shift by a defined offset value, and/or that the gas burner 10 is shut down.
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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)
Description
- The present patent application relates to a method for operating a gas burner.
-
EP 1 084 369 B1EP 1 179 159 B1EP 1 084 369 B1EP 1 179 159 B1claim 1, the electrical or electronic sensor is coupled to the gas duct and to a reference point. The electrical or electronic sensor is especially designed as a flow-meter. An actual value corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure in the air duct or corresponding to a pressure ratio between the gas pressure in the gas duct and the air pressure at the reference point is provided by the electrical or electronic sensor, wherein this actual value is compared with a nominal value. A control variable for a gas valve assigned to the gas duct is generated on basis of the control deviation between the actual value and nominal value, wherein the gas valve is adjusted on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture. - According to
EP 1 084 369 B1EP 1 179 159 B1 - In other words, according to the prior art the mixing ratio of the gas/air mixture is kept constant over the entire fan speed range of the fan, either to provide a 1:1 gas-air control having a ratio between the gas pressure and the air pressure of 1:1 over the entire modulation range of the gas burner or to provide a 1:N (N>1) gas-air control having a ratio between the gas pressure and the air pressure of 1:N over the entire modulation range of the gas burner. In both cases a so-called λ-value is usually greater than 1.
-
DE 101 14 901 A1 discloses a method for operating a gas burner in which a controller uses signals provided by two mass flow sensors and a signal provided by a viscosity sensor to generate an output signal for a fan. The controller determines a certain fan speed for the fan on basis of the signals of these three sensors in order to control λ. - Against this background, a novel method for operating a gas burner is provided.
- The method for operating a gas burner is defined in the
claim 1. - The novel method for operating a gas burner provides over the entire modulation range of the gas burner an optimized mixing ratio of the gas/air mixture, whereby the variation and thereby optimization of the mixing ratio of the gas/air mixture as a function of the fan speed is allowed only if the operating conditions of the gas burner are good enough. This results into a very stable operation of the gas burner.
- Preferred developments of the invention are provided by the dependent claims and the description which follows. Exemplary embodiments are explained in more detail on the basis of the drawing, in which:
- Figure 1
- shows a schematic view of a gas burner.
-
Figure 1 shows a schematic view of agas burner 10. Thegas burner 10 comprises a burner chamber 11 in which combustion of a gas/air mixture takes place during burner-on phases of thegas burner 10. The combustion of the gas/air mixture results intoflames 12 monitored by e.g. aflame ionization sensor 13. Theflame ionization sensor 13 is an optional component of thegas burner 10. - The gas/air mixture is provided to the burner chamber 11 of the
gas burner 10 by mixing an air flow with a gas flow. Afan 14 sucks in air flowing through anair duct 15 and gas flowing though agas duct 16. Agas valve 17 for adjusting the gas flow through thegas duct 16 and asafety valve 18 are assigned to thegas duct 16. The position of thegas valve 17 is adjusted by apressure regulator 19. - The gas/air mixture having a defined mixing ratio of gas and air is provided to the burner chamber 11 of the
gas burner 10. The gas/air mixture is provided by mixing the air flow provided by anair duct 15 with a gas flow provided by agas duct 16. The air flow and the gas flow become preferably mixed by a mixing device. Such a mixing device can be designed as a Venturi nozzle (not shown). The quantity of the air flow and thereby the quantity of the gas/air mixture flow is adjusted by thefan 14, namely by the speed of thefan 14. The fan speed can be adjusted by anactuator 22 of thefan 14. - The defined mixing ratio of the gas/air mixture is controlled by a
controller 20 on basis of a signal provided by an electrical orelectronic sensor 23. In the shown embodiment, the electrical orelectronic sensor 23 is coupled to thegas duct 16 and to areference point 24. - The electrical or
electronic sensor 23 is preferably designed as a flow-meter. - An actual value corresponding to a pressure ratio between the gas pressure in the
gas duct 16 and the air pressure at thereference point 24 is provided by the electrical orelectronic sensor 23. This actual value is compared by thecontroller 20 with a nominal value stored in thecontroller 20. - The
controller 20 generates a control variable for thegas valve 17, namely for anactuator 21 of thegas valve 17, on basis of the control deviation between the actual value provided by the electrical orelectronic sensor 23 and the nominal value stored in thecontroller 20. - The gas valve position of the
gas valve 17 is adjusted by theactuator 21 of the same on basis of this control variable in order to provide the defined mixing ratio of gas and air in the gas/air mixture. - According to
Figure 1 , theflames 12 resulting form the combustion of the gas/air mixture are used to heat aheat exchanger 25 positioned in the burner chamber 11. Atemperature sensor 26 is used to measure a temperature of theheat exchanger 25, especially a temperature of water flowing through theheat exchanger 25. - Exhaust gas resulting from the combustion of the gas/air mixture can exit from the burner chamber 11 though an
exhaust pipe 28. Anexhaust gas sensor 27 assigned to theexhaust pipe 28 can be used to analyze the emissions of the exhaust gas, especially NOx emissions of the same. Theexhaust gas sensor 27 is an optional component of thegas burner 10. - The mixing ratio of gas and air of the gas/air mixture provided to the burner chamber 11 is not kept constant over the modulation range of the gas burner. The mixing ratio of gas and air of the gas/air mixture provided to the burner chamber 11 is changed as a function on the speed of the
fan 14. - Preferably, for fan speeds of the
fan 14 being smaller than a lower threshold a gas/air mixture is provided having a mixing ratio of gas and air adapted to provide a stable combustion, especially a stable and secure ignition, of the gas/air mixture. Preferably, for fan speeds being smaller than the lower threshold a gas/air mixture having a mixing ratio of gas and air is provided resulting in a combustion with an almost constant output of theflame ionization sensor 13 or alternatively with an almost constant output of theexhaust gas sensor 27. - Preferably, for fan speeds of the
fan 14 being larger than an upper threshold a gas/air mixture is provided having a mixing ratio of gas and air adapted to provide a combustion with reduced emissions. Preferably, for fan speeds being larger than the upper threshold a gas/air mixture having a mixing ratio of gas and air is provided resulting in a combustion with an output of theexhaust gas sensor 27 being smaller that an emission threshold. - Preferably, for fan speeds being larger than the lower thresholds, especially for fan speeds being larger than the lower thresholds and lower than the upper threshold, the mixing ratio of gas and air of the gas/air mixture is freely adjustable as a function of the fan speed of the
fan 14. It is possible to use intermediate thresholds between the upper threshold and the lower threshold in order divide this fan speed range into sub-ranges. - According to a preferred embodiment, for fan speeds of the
fan 14 being larger than the lower thresholds and lower than the upper threshold a gas/air mixture is provided being leaner than the gas/air mixture which is provided for fan speeds of thefan 14 being larger than the upper threshold. Further on, for fan speeds of thefan 14 being larger than the lower thresholds and lower than the upper threshold a gas/air mixture is provided being leaner than the gas/air mixture which is provided for fan speeds of thefan 14 being smaller than the lower threshold. - Preferably, for fan speeds of the
fan 14 being smaller than the lower thresholds a gas/air mixture is provided being preferably leaner than the gas/air mixture of thefan 14 which is provided for fan speeds being larger than the upper threshold. Alternatively, for fan speeds of thefan 14 being smaller than the lower thresholds a gas/air mixture is provided being richer than the gas/air mixture of thefan 14 which is provided for fan speeds being larger than the upper threshold. It is also possible that for fan speeds being smaller than the lower thresholds a gas/air mixture is provided having the same mixing ratio of gas and air than the gas/air mixture which is provided for fan speeds being larger than the upper threshold. - According to a preferred embodiment, in a first section of the modulation range of the gas burner, namely for fan speeds being larger than the upper threshold, a 1:1 gas-air control having a ratio between the gas pressure and the air pressure of 1:1 is provided. In a second section of the modulation range of the gas burner, namely for fan speeds of the
fan 14 being larger than the lower thresholds and lower than the upper threshold, a 1:N (N>1) gas-air control having a ratio between the gas pressure and the air pressure of 1:N is provided. In a third section of the modulation range of the gas burner, namely for fan speeds being smaller than the lower thresholds, a 1:M (N>M>1 or N>M=1 or N>1 >M) gas-air control having a ratio between the gas pressure and the air pressure of 1:M is provided. The second section of the modulation range can be divided into subsections by e.g. intermediate thresholds. - As a function of on the fan speed of the
fan 14 thecontroller 20 generates an offset value which becomes added to the nominal value for the signal provided by the electrical orelectronic sensor 23. - Alternatively, as a function on the fan speed of the
fan 14 thecontroller 20 generates an offset value which becomes added to control variable for agas valve 17. - The respective offset value which is a function of the fan speed and which is stored in the
controller 20 is freely programmable as a function of the fan speed. - The variation of the mixing ratio of the gas/air mixture provided to the burner chamber 11 as a function of the speed of the
fan 14 is allowed only at defined operating conditions of thegas burner 10. - If the defined operating conditions of the
gas burner 10 are not fulfilled, thecontroller 20 blocks the above variation of the mixing ratio of the gas/air mixture as a function of the speed of thefan 14. - According to a first aspect, the variation of the mixing ratio of the gas/air mixture is only allowed if the heat exchanger temperature measured by the
temperature sensor 26 is greater than a temperature threshold. If the temperature of theheat exchanger 25 is below the temperature threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of thegas burner 10 and thereby over the entire fan speed range of thefan 14. However, if the temperature of theheat exchanger 25 is above the temperature threshold, the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of thegas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above. - According to a second aspect, the variation of the mixing ratio of the gas/air mixture is only allowed if the
gas burner 10 has been operated with a defined load for at least a defined time period, especially if the burner load has been greater than a burner load threshold for a time period being greater than a time threshold. If the burner load is below the burner load threshold and/or if the time period is below the time threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of thegas burner 10 and thereby over the entire fan speed range. However, if the burner load is above the burner load threshold and if the time period is above the time threshold the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of thegas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above. - According to the invention, the variation of the mixing ratio of the gas/air mixture is only allowed if the fan speed is stable, namely if the variation of the fan speed is lower than a variation threshold for a time period being greater than a time threshold. If the variation of the fan speed is above the variation threshold and/or if the time period is below the time threshold, the defined mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the
gas burner 10 and thereby over the entire fan speed range. However, if the variation of the fan speed is below the variation threshold and if the time period is above the time threshold the defined mixing ratio of gas and air of the gas/air mixture is not kept constant over the modulation range of thegas burner 10. In this case the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed as discussed above. - It is possible to use two or all three of the above operating conditions in combination. In this case, the above variation of the mixing ratio of the gas/air mixture provided to the burner chamber 11 as a function of the speed of the
fan 14 is allowed only if two of the operating conditions or all three of the operating conditions of thegas burner 10 are commonly fulfilled. - As described above, the
controller 20 generates a control variable for thegas valve 17, namely for anactuator 21 of thegas valve 17. Theactuator 21 of thegas valve 17 can be a stepper motor. - At certain times during burner-on phases, especially in fixed time intervals, the
controller 20 preferably checks the function of the electrical orelectronic sensor 23, especially the gain of the electrical orelectronic sensor 23. In order to check the function of the electrical orelectronic sensor 23, thecontroller 17 generates an input variable for theactuator 21 by which theactuator 21 and thereby thegas valve 17 become adjusted by a defined degree or amount. If theactuator 21 is a stepper motor, thecontroller 20 generates an input variable for the stepper motor by which stepper motor is operated over a defined number of steps. - The output signal provided by electrical or
electronic sensor 23 in response to this operation of theactuator 21 and therebygas valve 17 is compared by thecontroller 20 with a nominal output signal expected in response to this operation of theactuator 21. If a deviation between actual output signal of the electrical orelectronic sensor 23 and the nominal output signal is greater than a threshold, thecontroller 20 determines an improper function of the electrical orelectronic sensor 23, especially a non tolerable change of the sensor gain of the electrical orelectronic sensor 23. If the deviation between actual output signal of the electrical orelectronic sensor 23 and the nominal output signal is smaller than the threshold, thecontroller 20 determines a proper function of the electrical orelectronic sensor 23, especially a tolerable change of the sensor gain of the electrical orelectronic sensor 23 or no change of the sensor gain. - If the
controller 20 determines an improper function of the electrical orelectronic sensor 23, especially a non tolerable change of the sensor gain of the electrical orelectronic sensor 23, thecontroller 20 preferably initiates at least one defined action. - One preferred action initiated by the
controller 20 in case the same determines an improper function of the electrical orelectronic sensor 23, especially a non tolerable change of the sensor gain, is that thecontroller 20 blocks the above variation of the mixing ratio of the gas/air mixture provided to the burner chamber 11 as a function of the speed of thefan 14. Only if thecontroller 20 determines a proper function of the electrical orelectronic sensor 23, thecontroller 20 will allow the variation of the mixing ratio of the gas/air mixture as a function of the speed of thefan 14. - Other preferred actions initiated by the
controller 20 in response to a detected improper function of the electrical orelectronic sensor 23 are that thecontroller 20 generates a service signal indicating that the burner should be inspected by a service person, and/or that thecontroller 20 performs a calibration for the sensor gain of the electrical orelectronic sensor 23, and/or that thecontroller 20 performs a compensation for the sensor gain shift by a defined offset value, and/or that thegas burner 10 is shut down. -
- 10
- gas burner
- 11
- burner chamber
- 12
- flame
- 13
- ionization sensor
- 14
- fan
- 15
- air duct
- 16
- gas duct
- 17
- regulating valve
- 18
- safety valve
- 19
- pressure regulator
- 20
- controller
- 21
- actuator
- 22
- actuator
- 23
- sensor
- 24
- reference point
- 25
- heat exchanger
- 26
- temperature sensor
- 27
- exhaust gas sensor
- 28
- exhaust pipe
Claims (4)
- Method for operating a gas burner (10), wherein during burner-on phases a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber (11) of the gas burner (10) for combusting the gas/air mixture within the burner chamber (11), wherein the gas/air mixture is provided by mixing an air flow sucked in by a fan (14) with a gas flow, and wherein the defined mixing ratio of the gas/air mixture is controlled by comparing an actual value of a signal provided by an electrical or electronic sensor (23) coupled to a gas duct (16) with a nominal value for the signal provided by the electrical or electronic sensor (23) and by generating a control variable for a gas valve (17) assigned to the gas duct (16) on basis of the control deviation between the actual value and the nominal value, wherein the actual value provided by the electrical or electronic sensor (23) corresponds to a pressure ratio between the gas pressure in the gas duct (16) and the air pressure at a reference point (24), characterized in that the mixing ratio of the gas/air mixture is changed depending on the speed of the fan (14), whereby the variation of the mixing ratio of the gas/air mixture as a function of the fan speed is allowed only at defined operating conditions of the gas burner (10), namely if the variation of the fan speed is lower than a variation threshold for a time period being greater than a time threshold, and wherein if the defined operating conditions are not fulfilled, the variation of the mixing ratio of the gas/air mixture as a function of the fan speed is blocked.
- Method as claimed in claim 1, characterized in that if a variation of the fan speed is above a variation threshold and/or if the time period is below a time threshold, the mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner (11), and if the variation of the fan speed is below the variation threshold and if the time period is above the time threshold, the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed.
- Method as claimed in claim 1 or 2, characterized in that the variation of the mixing ratio of the gas/air mixture as a function of the fan speed is allowed if a heat exchanger temperature of a heat exchanger (25) positioned within the burner chamber (11) is greater than a temperature threshold, namely in such a way that if the temperature of the heat exchanger (25) is below the temperature threshold, the mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner (11), and if the temperature of the heat exchanger (25) is above the temperature threshold, the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed.
- Method as claimed in one of claims 1 to 3, characterized in that the variation of the mixing ratio of the gas/air mixture as a function of the fan speed is allowed if the gas burner (11) is operated with a defined load for a defined time period, namely in such a way if the burner load is below a burner load threshold and/or if the time period is below a time threshold, the mixing ratio of gas and air of the gas/air mixture is kept constant over the entire modulation range of the gas burner (11), and if the burner load is above the burner load threshold and if the time period is above the time threshold, the mixing ratio of gas and air of the gas/air mixture is variable as a function of the fan speed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12176353.6A EP2685168B1 (en) | 2012-07-13 | 2012-07-13 | Method for operating a gas burner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12176353.6A EP2685168B1 (en) | 2012-07-13 | 2012-07-13 | Method for operating a gas burner |
Publications (2)
Publication Number | Publication Date |
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EP2685168A1 EP2685168A1 (en) | 2014-01-15 |
EP2685168B1 true EP2685168B1 (en) | 2015-10-14 |
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Application Number | Title | Priority Date | Filing Date |
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EP12176353.6A Active EP2685168B1 (en) | 2012-07-13 | 2012-07-13 | Method for operating a gas burner |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3039260B1 (en) * | 2015-07-23 | 2017-08-25 | Bosch Gmbh Robert | METHOD FOR MANAGING A CONDENSATION AND CHADIER BOILER FOR IMPLEMENTING THE METHOD |
EP3228936B1 (en) * | 2016-04-07 | 2020-06-03 | Honeywell Technologies Sarl | Method for operating a gas burner appliance |
EP4155609B1 (en) | 2021-09-24 | 2024-07-10 | Pittway Sarl | Method and controller for operating a gas burner appliance |
Citations (2)
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EP1179159B1 (en) * | 1999-05-14 | 2004-11-24 | Honeywell B.V. | Regulating device for gas burners |
DE102004055716A1 (en) * | 2004-06-23 | 2006-01-12 | Ebm-Papst Landshut Gmbh | Firing equipment for gas burners has means for determining value dependent on measured temperature and means for regulating generated temperature using characteristic line representing value range corresponding to ideal temperature |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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NL8503058A (en) * | 1985-11-07 | 1987-06-01 | Nefit Nv | METHOD FOR IGNITING A BURNER AND A BURNER FOR CARRYING OUT THIS METHOD |
ATE189301T1 (en) * | 1995-10-25 | 2000-02-15 | Stiebel Eltron Gmbh & Co Kg | METHOD AND CIRCUIT FOR CONTROLLING A GAS BURNER |
EP0863367B1 (en) * | 1997-03-05 | 2002-01-30 | Siemens Building Technologies AG | Control device for a gas burner |
DE19824521B4 (en) | 1998-06-02 | 2004-12-23 | Honeywell B.V. | Control device for gas burners |
DE10114901A1 (en) * | 2001-03-26 | 2002-10-10 | Invent Gmbh Entwicklung Neuer Technologien | Method and device for adjusting the air ratio of a fuel air mixture, measures mass flows and wobbe index and adjusts to give predetermined lambda |
ATE534871T1 (en) * | 2003-10-08 | 2011-12-15 | Vaillant Gmbh | METHOD FOR CONTROLLING A GAS BURNER, PARTICULARLY FOR HEATING SYSTEMS WITH A FAN |
US20070287111A1 (en) * | 2004-06-01 | 2007-12-13 | Roberts-Gordon Llc | Variable input radiant heater |
DE202005018671U1 (en) * | 2004-12-06 | 2006-03-02 | Vaillant Gmbh | Regulator for heating device has a processor and variable non-volatile data memory and data interface for interchanging data for adapting regulating functions |
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2012
- 2012-07-13 EP EP12176353.6A patent/EP2685168B1/en active Active
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EP1179159B1 (en) * | 1999-05-14 | 2004-11-24 | Honeywell B.V. | Regulating device for gas burners |
DE102004055716A1 (en) * | 2004-06-23 | 2006-01-12 | Ebm-Papst Landshut Gmbh | Firing equipment for gas burners has means for determining value dependent on measured temperature and means for regulating generated temperature using characteristic line representing value range corresponding to ideal temperature |
Non-Patent Citations (1)
Title |
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W. BEITZ: "Strömungstechnische Messgrössen", DUBBEL TASCHENBUCH FÜR DEN MASCHINENBAU, 31 December 1997 (1997-12-31), XP055135135, ISBN: 978-3-54-062467-7, [retrieved on 20140818] * |
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