EP3746705A1 - Method for controlling a gas mixture using a gas mixture sensor - Google Patents
Method for controlling a gas mixture using a gas mixture sensorInfo
- Publication number
- EP3746705A1 EP3746705A1 EP20702081.9A EP20702081A EP3746705A1 EP 3746705 A1 EP3746705 A1 EP 3746705A1 EP 20702081 A EP20702081 A EP 20702081A EP 3746705 A1 EP3746705 A1 EP 3746705A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- gas mixture
- sensor signal
- sensor
- fuel gas
- 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.)
- Withdrawn
Links
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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
-
- 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
- F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/10—Analysing fuel properties, e.g. density, calorific
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Definitions
- the invention relates to a method for regulating a gas mixture in a fuel gas-operated heater.
- the state of the art is also a combustion control according to the so-called SCOT method, in which the amount of air supplied to the burner of the heater is controlled according to the burner output.
- a flame signal measurement is carried out using an ionization sensor and the gas-air mixture is regulated to a target ionization measured value stored in a characteristic curve.
- the SCOT process it is disadvantageous that the flame signal drops sharply at low burner outputs and the control is therefore unreliable.
- the adaptation effort, especially for adapting the burner geometry is high and the burner output can only be determined inaccurately via the fan speed of a fan supplying the air volume flow for the gas-air mixture.
- the invention is therefore based on the object of providing a less complex yet precise method for regulating a gas mixture in a fuel gas-operated heating device which is also robust against external influences such as dust.
- a method for regulating a gas mixture is formed from a gas and a fuel gas in a fuel gas-operated one
- Heater proposed, in which the gas mixture is generated by a gas amount via a first actuator and a via a second actuator Amount of fuel gas provided and mixed.
- a microthermal gas mixture sensor which detects at least one material property of the gas mixture, is acted upon by the gas mixture and continuously transmits a sensor signal dependent on the respective gas mixture to a control unit.
- the control unit compares the sensed sensor signal with a target value of the sensor signal and, in the event of a deviation of the sensed sensor signal with the target value of the sensor signal, controls at least one of the first and second actuators.
- the gas mixture is adjusted by increasing or decreasing the amount of gas and / or increasing or decreasing the amount of fuel gas until the setpoint of the sensor signal is reached.
- An important point is the measurement of the at least one material property of the gas mixture.
- a change in the amount of gas or the amount of fuel gas would be recognized immediately by a change in the material properties of the gas mixture sensor.
- a change in the material properties of the gas mixture at the gas mixture sensor can be corrected directly via the control unit.
- the material property of the gas mixture detected by the microthermal gas mixture sensor is preferably the thermal conductivity, the temperature conductivity or the speed of sound of the gas mixture. However, several of these material properties can also be recorded, so that a more precise assignment of the majority of the properties to the gas mixture is possible.
- the microthermal gas mixture sensor is designed as a gas mass sensor, both of which are supplied to the burner of the heater
- Gas mixture mass as well as other physical physical properties recorded are recorded.
- calorimetric microsensors which record the thermal conductivity of the gas mixture in addition to the thermal conductivity.
- At least one gas mass sensor based on the functional principle of the ultrasonic measurement to determine the
- the method is characterized in that the setpoint value of the sensor signal is adjusted by the control device as a function of a composition of the gas or the fuel gas. If the composition of the fuel gas changes (e.g. from propane to butane), the measured properties of the gas mixture change. In addition, other fuel gas compositions require different amounts of air for optimal combustion. A new mixing ratio between gas and fuel gas is therefore also required.
- Such an adjustment of the setpoint of the sensor signal takes place through a calibration process.
- the control unit changes the first actuator of the gas quantity or the second actuator of the fuel gas quantity until the desired result is achieved.
- the original setpoint is replaced by the new measured sensor signal for further mixture control.
- the calibration process is carried out by ionization current regulation of a flame signal from a burner of the heater until an ionization setpoint is reached.
- a stoichiometric combustion of the burner of the heater is first set.
- the flame signal of the burner of the heater and thus a corresponding ionization current are recorded via an ionization probe.
- the ionization current is maximum in stoichiometric combustion. From this value of the ionization
- an ionization setpoint is calculated using a percentage determined by laboratory technology and saved as a future ionization current setpoint, which must be achieved in the desired combustion. Then only the gas quantity is reduced by a predetermined factor in order to operate the burner with the desired gas mixture at the predetermined ionization setpoint.
- the method is further characterized in that when the ionization setpoint is reached, the at least one material property of the gas mixture is measured by means of the gas mixture sensor and is stored in the control unit as the new setpoint of the sensor signal.
- the new setpoint is used for further control and replaces the previous setpoint.
- the calibration process is preferably carried out in the event of implausibilities of the sensor signal of the gas mixture sensor or in cyclical predetermined intervals.
- the implausibility of the sensor signal is determined when the meat processor is started, in that only the known gas is initially supplied and the gas mixture sensor is acted upon with it.
- An implausibility exists if the sensor signal of the material property measured by the gas mixture sensor, e.g. the thermal conductivity or the thermal conductivity, does not correspond to a sensor signal for the known gas.
- the ambient air whose material properties are known is usually used as the gas in meat processing equipment.
- Gas mixture sensor is acted upon.
- the fuel gas is then supplied, the gas mixture is generated and the gas mixture sensor is acted upon by the gas mixture.
- the type of gas in the fuel gas is determined from the change in the sensor signal when the fuel gas is supplied.
- the control unit then adjusts the gas mixture depending on the gas type of the fuel gas determined until the setpoint of the sensor signal is reached.
- the starting power can thus be controlled by the control unit via the position of the control element of the fuel gas to a favorable starting point immediately after the gas family is recognized, and the ignition mixture for starting the burner is achieved more quickly and precisely.
- the method also makes use of the above-described effect of increasing or decreasing the sensor signal in the case of different fuel gases and provides that the direction of action of the control is detected from the change in the sensor signal when the fuel gas is supplied, and is used to determine whether to achieve the Setpoint of the sensor signal, the amount of fuel gas supplied is increased or decreased.
- the goal is always clean combustion with the necessary gas mixture.
- the gas is preferably air, the fuel gas is preferably liquid gas or natural gas.
- Mixture control is possible, since every change in both the air volume and the gas volume does not change the signal on the gas mixture sensor. This can be the case if, for example, mixed fuel gases are used Combustion that happens to have the same physical properties as air. This state is recognized by the control unit both when the heater is started and during a calibration by means of a plausibility check in that no significant change in the sensor signal is measured when the air or the gas quantity changes. In this case, the control unit can
- Fig. 2 shows a structure of a heater for performing the procedure.
- Fig. 3 shows a control characteristic of the sensor signal
- Fig. 4 is a control characteristic of the sensor signal of the
- Fig. 5 control characteristics before and after a change in
- Fuel gas properties, 6 shows a characteristic curve of the ionization current control.
- FIG. 2 shows a specific embodiment of a fuel gas-operated pickling device 200 with a gas safety valve 101, a gas control valve 102 as an actuator for the amount of fuel gas 103, a mixing fan 107 for drawing in air 104 and mixing with the fuel gas 103 for generating the gas mixture 105.
- a gas safety valve 101 a gas control valve 102 as an actuator for the amount of fuel gas 103
- a mixing fan 107 for drawing in air 104 and mixing with the fuel gas 103 for generating the gas mixture 105.
- About the speed the amount of air of the mixing fan 107 is adjustable; it therefore provides the actuator for the air supply.
- the heater 200 comprises the microthermal gas mixture sensor 106, a second gas mixture sensor 108 being shown as an alternative installation position in the blow-out area of the mixing fan 107. Basically, however, no second gas mixture sensor is required.
- the mixing fan 107 conveys the gas mixture 105 to the burner 109, on which the ionization electrode 111 is installed, in order to monitor the burner flame.
- the signal lines to and from the control device 100 are shown by arrows, which processes the regulation of the gas mixture 105.
- a diagram 30 in FIG. 3 shows a simplified linear relationship used for the control between the sensor signal 31 detected by the gas mixture sensor 6 for pure air 2 (reference number 34 corresponds to 100% air) and the sensor signal 32 for pure fuel gas 1 (reference number 36 corresponds to) 100% fuel gas).
- sensor signal 33 lies in between.
- the amounts of air 2 and fuel gas 1 are adjusted via the respective actuators 3 and / or 4 until the mixture properties of the desired mixture ratio required by the process are detected by the gas mixture sensor 6.
- FIG. 3 shows a linear course of the characteristic curve of the sensor signal, but non-linear characteristic curves are also possible which, for example, enable regulation of the corresponding positions of the actuators 3, 4 via value tables.
- the sensor signal drops the more fuel gas 1 is supplied.
- the sensor signal is shown as an example as a function of the thermal conductivity as a material property of the gas mixture 5, the fuel gas being, for example, liquid gas and the thermal conductivity of liquid gas being lower than that of air.
- the fuel gas 1 is natural gas, the thermal conductivity of which is higher than that of air.
- diagram 40 according to FIG. 4 a simplified linear relationship used for the control between that of the
- Gas mixture sensor 6 detected sensor signal 41 with clean air 2 (reference Chen 44 corresponds to 100% air) and the sensor signal 42 for pure fuel gas 1 (reference symbol 46 corresponds to 100% fuel gas / natural gas).
- the sensor signal 43 lies in between, but is close to the sensor signal 41 of pure fuel gas 1.
- the control unit 7 uses the signal change of the gas mixture sensor 6 for the Increasing the amount of fuel gas determines the direction of action of the control and is used as a basis for the further mixture control.
- FIG. 5 shows a diagram 60 to show the calibration when, for example, the nature of the fuel gas 1 changes so that a new gas mixture composition is required to ensure optimal combustion.
- the fuel gas changes as an example from propane to butane.
- the reference numerals 66 and 68 determine the range between 100% air and 100% fuel gas, the signal value 61 being at 100% air.
- FIG. 6 shows a diagram 20 for calibration by means of ionization current control with a characteristic curve of the ionization signal (lo signal) detected by the ionization electrode in the burner flame relative to the fuel gas Air ratio l. Since the basic structure according to FIG. 1 shows no ionization electrode, reference is made below to the heater 200 according to FIG. 2.
- the control unit 100 controls the amount of air 104 to a predetermined value, the ionization signal at the ionization electrode 111 of the burner 109 is measured and the amount of fuel gas 103 is increased until the ionization signal changes from the originally existing ionization value 21 for a fuel gas Air ratio 24 has risen to the maximum 22. From this value, the ionization setpoint 23 is calculated with a percentage determined by laboratory technology and stored as a future ionization current setpoint, which the desired fuel gas / air ratio 25 must be achieved with a higher excess air.
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 |
---|---|---|---|
DE102019101189.2A DE102019101189A1 (en) | 2019-01-17 | 2019-01-17 | Process for regulating a gas mixture |
PCT/EP2020/051148 WO2020148434A1 (en) | 2019-01-17 | 2020-01-17 | Method for controlling a gas mixture using a gas mixture sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3746705A1 true EP3746705A1 (en) | 2020-12-09 |
Family
ID=69232826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20702081.9A Withdrawn EP3746705A1 (en) | 2019-01-17 | 2020-01-17 | Method for controlling a gas mixture using a gas mixture sensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3746705A1 (en) |
DE (1) | DE102019101189A1 (en) |
WO (1) | WO2020148434A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020132501A1 (en) | 2020-12-07 | 2022-06-09 | Ebm-Papst Landshut Gmbh | Method for controlling a combustion process of a gas boiler and gas boiler |
EP4047268A1 (en) | 2021-02-18 | 2022-08-24 | BDR Thermea Group B.V. | Method for operating a gas heater |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69014308T3 (en) * | 1989-10-30 | 1998-04-16 | Honeywell Inc | COMBUSTION CONTROL WITH MICROMEASURING BRIDGE. |
DE19918901C1 (en) * | 1999-04-26 | 2001-05-03 | Franz Durst | Device for setting the oxidant / fuel mixture in the feed line of a 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) |
DE102010046954B4 (en) * | 2010-09-29 | 2012-04-12 | Robert Bosch Gmbh | Method for calibration, validation and adjustment of a lambda probe |
EP2574918B1 (en) * | 2011-09-28 | 2014-12-10 | Mems Ag | Microthermal method and sensor for determining physical gas properties |
EP2843214B1 (en) * | 2013-05-29 | 2021-06-23 | Mems Ag | Method, sensor and control device for controlling gas-powered energy conversion systems |
DE202018101271U1 (en) * | 2018-03-07 | 2018-03-15 | Ebm-Papst Landshut Gmbh | Fuel gas fired heater |
EP3760926B1 (en) * | 2018-10-05 | 2021-12-01 | Sensirion AG | Device for regulating a mixing ratio of a gas mixture |
-
2019
- 2019-01-17 DE DE102019101189.2A patent/DE102019101189A1/en not_active Withdrawn
-
2020
- 2020-01-17 WO PCT/EP2020/051148 patent/WO2020148434A1/en unknown
- 2020-01-17 EP EP20702081.9A patent/EP3746705A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102019101189A1 (en) | 2020-07-23 |
WO2020148434A1 (en) | 2020-07-23 |
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Inventor name: HERMANN, JENS Inventor name: WALD, STEPHAN Inventor name: HENRICH, HARTMUT |
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