EP3596391A1 - Method for controlling a combustion-gas operated heating device - Google Patents
Method for controlling a combustion-gas operated heating deviceInfo
- Publication number
- EP3596391A1 EP3596391A1 EP18758556.7A EP18758556A EP3596391A1 EP 3596391 A1 EP3596391 A1 EP 3596391A1 EP 18758556 A EP18758556 A EP 18758556A EP 3596391 A1 EP3596391 A1 EP 3596391A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- air
- volume flow
- mixture
- ionization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 title claims abstract 3
- 239000000567 combustion gas Substances 0.000 title abstract 2
- 239000000203 mixture Substances 0.000 claims abstract description 50
- 238000005259 measurement Methods 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 6
- 230000004913 activation Effects 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 2
- 239000003570 air Substances 0.000 description 80
- 239000007789 gas Substances 0.000 description 72
- 238000002485 combustion reaction Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- GVGLGOZIDCSQPN-PVHGPHFFSA-N Heroin Chemical compound O([C@H]1[C@H](C=C[C@H]23)OC(C)=O)C4=C5[C@@]12CCN(C)[C@@H]3CC5=CC=C4OC(C)=O GVGLGOZIDCSQPN-PVHGPHFFSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 235000012976 tarts Nutrition 0.000 description 1
Classifications
-
- 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
- F23N1/022—Regulating fuel supply conjointly with air supply 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
- F23N5/02—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
- 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
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/06—Sampling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/20—Calibrating devices
Definitions
- the invention relates to a method for controlling a fuel gas operated heater.
- WO2006 / 000366A1 The expert also knows a combustion control according to the so-called SCOT method, in which the control of the amount of air supplied to the burner of the heater takes place in accordance with the burner output.
- SCOT method a flame signal measurement is carried out by means of an ionization sensor and the gas-air mixture to one in a characteristic curve stored setpoint ionization measured value regulated.
- the SCOT method it is disadvantageous that the flame signal drops sharply at low burner outputs and the control therefore becomes unreliable.
- the adaptation effort, in particular for adjusting the burner geometry is high and the burner power can only be determined inaccurately on the fan speed of the air flow for the gas-air mixture supplying blower.
- a problem of the control methods is also that different types of gas, e.g. Natural gas or LPG, as well as gas qualities are used.
- the parameters of the control method must be adapted to the type of gas or gas quality, otherwise the combustion will be unclean.
- the number of air differs in practice preferably at different burner performance points and in different gas families (eg natural gas or LPG).
- this relationship is stored in the form of power-dependent ⁇ -characteristic curves in the control unit. Automatic selection of the correct characteristic requires automatic gas detection.
- the calorific value of the different gases corresponds approximately to the value of the air requirement L. This relationship is used for the pilot control of the modulating combustion air blower to a desired burner performance. Since all gases change their volume under different temperatures and pressures, the conditions listed above only apply under the same pressure and temperature conditions.
- the invention has for its object to provide a gasartunplies method for controlling a fuel gas heater.
- the gas type and its control parameters to the specific gas type.
- a method for controlling a fuel gas fired heater using an ionization setpoint power curve, wherein a gas volumetric flow delivered via a gas supply and an air volumetric flow supplied via a fan are mixed to form a gas-air mixture and with an air ratio based on a desired burner output ⁇ are fed to a burner of the heater.
- the air ratio ⁇ is monitored by means of a lonisationsmessvon a burner flame of the burner.
- a plausibility check in which an ionization measurement signal of the ionization measurement method is evaluated, and in the case of a deviation from an ionization measurement signal setpoint, a mixture calibration of the gas-air mixture takes place.
- the mixture calibration is carried out by an ionisationsstromregelung in which the air ratio ⁇ of the gas-air mixture is adjusted to a value Aj 0n -max, in which a maximum ionisationsmesssignal on an ionization onionselectrode the ionization in the burner flame is reached. From the maximum ionization measurement signal an ionization signal setpoint for the air ratio ⁇ is calculated in a calibration point and then the air ratio ⁇ -max is adjusted to a desired air ratio A S0 n until the ionization measurement signal corresponds to the calculated ionisation signal setpoint.
- the control of the burner power of the respective heat demand request is made to the heater.
- the required amount of air is changed by the speed-controlled fan of a control unit.
- the fan speed essentially corresponds to the air volume flow.
- the supplied gas volume flow is varied by an electrically modulated gas actuator or gas valve and measured by a gas mass flow sensor.
- the regulation of the gas volume flow also takes place via the control unit.
- the blower is preferably designed as a premixing blower for mixing gas and air, so that the blower delivers a mixture volume flow to the burner.
- the gas-air mixture control is based on the continuous detection of the air flow through a
- the parameters influencing optimum combustion are Parameters such as gas type, gas quality, exhaust system, heater assemblies such as the check valves in front of the burner or the heat exchanger work in the desired manner. Any change in these parameters affects the gas-air ratio and hence the ionization measurement signal. This in turn can be detected.
- the mixture calibration according to the invention makes it possible to adapt the air ratio ⁇ and the conversion of the heater into the optimum combustion, taking into account the parameters influencing the combustion.
- the values of the air demand value L are known for each gas as described above.
- the gas type determination can thus be detected automatically via the mixture calibration and stored in the control unit of the heater.
- the control unit can then use laboratory-technically predefined control characteristics for the corresponding gas type, in particular the corresponding ionization setpoint power curve, for further control.
- an advantageous embodiment of the method provides for adjusting the ionization setpoint power characteristic by the mixture calibration over an entire power range of the heater if the ionization measurement signal is above a defined threshold value of an ionization measurement signal.
- Setpoint deviates.
- the adaptation of the ionization setpoint power characteristic is carried out over its entire course by the ratio recorded at the calibration point of the mixture calibration.
- the new ionization setpoint power curve is then stores. After the mixture calibration, the gas and air quantity along the stored characteristic with the corresponding power-dependent air ratio and the newly set air demand value L are controlled.
- the air ratio ⁇ is adjusted by changing the gas volume flow or gas mass flow until the ionization measurement signal corresponds to the calculated ionization signal setpoint. This is possible via the control of the gas actuator in a simple and very accurate manner. In addition, the actual gas mass flow can be adjusted directly via the gas mass flow sensor.
- the mixture calibration can be run in a long version and in a short version.
- initially a mixture volume flow is generated at a fixed fan speed and the associated air volume flow is detected.
- a maximum value of the ionization signal is determined immediately and from this a new ionization setpoint for a known one is determined and adjusted. From the gas and air quantity regulated in this operating point, the air requirement is determined and used for the further mixture control.
- the associated desired ionization setpoint value is determined via the ionization setpoint power characteristic curve.
- the ionisationsstromsignal is measured by the control unit and compared with the currently stored characteristic value. Subsequently, the ionization current control steps are run through and the ionization setpoint power curve is adjusted and stored as described above. In this case, only in exceptional cases, the lonisationssignalmaximum must be determined.
- the mixture calibration is preferably carried out at a power point of the heater, which corresponds to a range of 50-70% of its aximal essence or the burner power.
- the method comprises a running time measurement for checking the correct function of the gas mass sensor.
- a running time measurement for checking the correct function of the gas mass sensor.
- an amount of the supplied gas volume flow is actively varied via activation of the gas actuator or gas valve and the transit time between the activation and the detection of the gas volume variation on the gas mass sensor is compared with a predefined transit time reference value.
- the gas valve position can be increased or reduced with the variation by one pulse, one oscillation or an actual value jump.
- the runtime setpoint is determined in advance by laboratory tests. If the running time is above a limit value, there is a gas sensor fault and the heater is put into an emergency operation, for example with limited modulation.
- the method in one embodiment comprises a transit time measurement for determining the gas-air mixture volume flow.
- the amount of the supplied gas volume flow is actively varied and the transit time between the activation and a change of the ionization measurement signal and optionally additionally the amount and type of change of the ionization measurement signal is detected.
- the measured runtime will be followed by a laboratory-technically predetermined transit-time flow characteristic compared. If the effect on the ionization measurement signal is too low due to the gas volume flow change, or if the ionization measurement signal changes in the wrong direction, the heater is switched to emergency mode. If the effect is in the tolerance range, the mixture volume flow is determined from the runtime comparison via a laboratory table.
- the transit time measurement is repeated at predetermined time intervals.
- a plausibility check of a sufficient air volume flow is constantly implemented over the entire performance range.
- the fan speed is plausibility safety.
- the transit time measurement can be used to perform a combustion air calculation in accordance with the stationarily recorded values at different power points. This allows the internally stored characteristic curve for combustion air calculation to be corrected dynamically.
- the method further provides that the actual air volume flow is calculated from a difference between the set air volume flow and the mixture volume flow determined over the transit time measurement and optionally a measured temperature of the air volume flow.
- the method provides that the fan speed and a resulting desired air volume flow from it are continuously adjusted with the actual air volume flow.
- the control unit switches off the heater and issues an alarm message.
- the method comprises the integration of the mixture calibration into a start-up procedure for a cold start of the heater. Ignition tests of the gas-air mixture are carried out until a burner flame is detected via the ionization measurement. The present at the time of ignition gas mass flow is kept constant and stored in the control unit.
- the starting air requirement L s tart is determined from the ratio of the gas volume flow to the air volume flow taken from the fan characteristic and corresponding to the ignition speed, and the gas type is determined therefrom as described above.
- the starting point for the next burner start is determined from the stored gas mass flow and the ignition range.
- Fig. 1 shows a schematic structure of a heater
- FIG. 2 shows a sequence of the mixture calibration in the short version
- FIG. 3 shows a sequence of the mixture calibration in the long version.
- FIG. 1 shows a schematic structure of a heater 100 for carrying out the control method with a modulating premix blower 5, which sucks in ambient air a and mixes it with gas.
- the gas is supplied to the premix blower 5 via a gas line in which a gas safety valve 1, an example of a motor M controllable gas valve 2 and a gas mass sensor 3 are arranged.
- the gas inlet pressure d is adjusted to the gas control pressure c.
- the mixture After mixing with ambient air, the mixture has the mixture pressure b.
- an optional check valve 6 is provided in the embodiment shown.
- the mixture then has the burner pressure e. This is followed by the burner 28 with the ionization electrode 7 arranged in the burner flame and a siphon 10 connected to the burner housing.
- the heat exchanger 18 is arranged.
- the exhaust system follows with the exhaust flap 8.
- the exhaust gas pressure prevails f.
- FIG. 2 shows the sub-process of the mixture calibration of the control method in the short version.
- step 601 the fan speed n of the premix blower 5 is controlled to a fixed value via the control unit 9 and the actual air volume flow vL-ist is calculated by means of the above-described transit time measurement in step 300.
- step 612 the ionization current control is carried out at a defined air volume flow vL-ist by the gas quantity being increased until a maximum ionization measurement signal (lo-max) is reached.
- the ionisation signal setpoint (lo-soll, lo-neu) for the desired air ratio ⁇ is calculated from the maximum ionization measurement signal and then the gas quantity is regulated in step 615 until the ionization measurement signal corresponds to the calculated ionisation signal setpoint lo-soll.
- the gas mass flow resulting in the new operating point is gas-is used in step 617 using the air-number power curve and thus the air ratio ⁇ 30 [ ⁇ , the Air volume flow vL and the current burner power the air demand value to calculate and on the air demand value L to determine the type of gas.
- the ionization calibration in the short version occurs with every mixture calibration.
- FIG. 3 shows the partial process of the mixture calibration of the control method in the long version.
- step 601 the fan speed n of the premix blower 5 is controlled to a fixed value via the control unit 9 and the actual air volume flow vL-ist is calculated. Subsequently, in step 605, the determination of the ionization signal setpoint lo-soll is carried out using the ionization setpoint value.
- the ionization current at the ionization electrode 7 is measured by the control unit 9 in an ionization measurement method and compared with the characteristic value. If the values agree, the measured ionization current is used for further mixture calibration. If the deviation of the comparison values is greater than a predefined threshold value, the ionization setpoint power characteristic curve is calibrated by increasing the gas quantity until the maximum ionization measurement signal lo-max is reached under step 612 at a defined air volume flow vL-ist. From the maximum ionization measurement signal, the ionization signal setpoint 624 (lo-soll) for the desired air ratio ⁇ (at 625) is calculated. According to step 613, the original ionization setpoint power characteristic lo-old over its entire power range is corrected lo-new by the ratio detected at the calibration point of mixture calibration to the new ionization setpoint power curve. The new ionization setpoint
- Performance curve lo-new is stored in the memory of the control unit 9.
- the amount of gas is controlled until the ionisationsmesss-ig- corresponds to the calculated ionization signal setpoint lo-soll.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017126137.0A DE102017126137A1 (en) | 2017-11-08 | 2017-11-08 | Method for controlling a fuel gas operated heater |
PCT/EP2018/071669 WO2019091612A1 (en) | 2017-11-08 | 2018-08-09 | Method for controlling a combustion-gas operated heating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3596391A1 true EP3596391A1 (en) | 2020-01-22 |
EP3596391B1 EP3596391B1 (en) | 2020-12-30 |
Family
ID=63294200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18758556.7A Active EP3596391B1 (en) | 2017-11-08 | 2018-08-09 | Method for controlling a combustion-gas operated heating device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3596391B1 (en) |
CN (1) | CN110573800B (en) |
DE (1) | DE102017126137A1 (en) |
WO (1) | WO2019091612A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114576648A (en) * | 2021-11-18 | 2022-06-03 | 浙江菲斯曼供热技术有限公司 | Method for operating a gas burner |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018105185A1 (en) | 2018-03-07 | 2019-09-12 | Ebm-Papst Landshut Gmbh | Method for detecting fuel gas in a fuel gas operated heater |
DE102019003451A1 (en) * | 2019-05-16 | 2020-11-19 | Truma Gerätetechnik GmbH & Co. KG | Method for monitoring a burner and / or a burning behavior of a burner and burner arrangement |
DE102020102117A1 (en) | 2020-01-29 | 2021-07-29 | Ebm-Papst Landshut Gmbh | Method for optimizing a tolerance range of a control characteristic of an electronic mixture control in a gas heater |
EP3913285A1 (en) * | 2020-05-22 | 2021-11-24 | Pittway Sarl | Method and controller for operating a gas burner appliance |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE189301T1 (en) * | 1995-10-25 | 2000-02-15 | Stiebel Eltron Gmbh & Co Kg | METHOD AND CIRCUIT FOR CONTROLLING A GAS BURNER |
DE102004055716C5 (en) | 2004-06-23 | 2010-02-11 | Ebm-Papst Landshut Gmbh | Method for controlling a firing device and firing device (electronic composite I) |
DE102010008908B4 (en) * | 2010-02-23 | 2018-12-20 | Robert Bosch Gmbh | A method of operating a burner and the air-frequency controlled modulating a burner power |
DE102010046954B4 (en) * | 2010-09-29 | 2012-04-12 | Robert Bosch Gmbh | Method for calibration, validation and adjustment of a lambda probe |
DE102010055567B4 (en) * | 2010-12-21 | 2012-08-02 | Robert Bosch Gmbh | Method for stabilizing a performance of a gas-fired burner |
CN103256623B (en) * | 2012-02-20 | 2015-06-17 | 宝山钢铁股份有限公司 | Method for flexibly controlling air excess coefficient of impulse burner |
DE102014224891A1 (en) * | 2014-12-04 | 2016-06-09 | Robert Bosch Gmbh | A heater apparatus and method of operating a heater apparatus |
DE102015116458A1 (en) * | 2015-09-29 | 2017-03-30 | Viessmann Werke Gmbh & Co Kg | Method for distinguishing between two combustion gases provided for a combustion process with different levels of energy |
-
2017
- 2017-11-08 DE DE102017126137.0A patent/DE102017126137A1/en active Pending
-
2018
- 2018-08-09 WO PCT/EP2018/071669 patent/WO2019091612A1/en unknown
- 2018-08-09 EP EP18758556.7A patent/EP3596391B1/en active Active
- 2018-08-09 CN CN201880027650.1A patent/CN110573800B/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114576648A (en) * | 2021-11-18 | 2022-06-03 | 浙江菲斯曼供热技术有限公司 | Method for operating a gas burner |
CN114576648B (en) * | 2021-11-18 | 2022-12-06 | 浙江菲斯曼供热技术有限公司 | Method for operating a gas burner |
Also Published As
Publication number | Publication date |
---|---|
EP3596391B1 (en) | 2020-12-30 |
DE102017126137A1 (en) | 2019-05-09 |
WO2019091612A1 (en) | 2019-05-16 |
CN110573800A (en) | 2019-12-13 |
CN110573800B (en) | 2021-06-15 |
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