EP4177521A2 - Procédé d'évaluation d'une différence de pression quasi stationnaire pouvant être obtenue par un capteur dans une chaudière à gaz et chaudière à gaz associée - Google Patents

Procédé d'évaluation d'une différence de pression quasi stationnaire pouvant être obtenue par un capteur dans une chaudière à gaz et chaudière à gaz associée Download PDF

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Publication number
EP4177521A2
EP4177521A2 EP22201795.6A EP22201795A EP4177521A2 EP 4177521 A2 EP4177521 A2 EP 4177521A2 EP 22201795 A EP22201795 A EP 22201795A EP 4177521 A2 EP4177521 A2 EP 4177521A2
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EP
European Patent Office
Prior art keywords
fuel
differential pressure
pressure
control valve
sensor
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
Application number
EP22201795.6A
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German (de)
English (en)
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EP4177521C0 (fr
EP4177521A3 (fr
EP4177521B1 (fr
Inventor
Enno Jan Vrolijk
Jens Hermann
Markus Weingart
Andreas KERSCHREITER
Simon Bernhard
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Ebm Papst Landshut GmbH
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Ebm Papst Landshut GmbH
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Publication date
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Publication of EP4177521A2 publication Critical patent/EP4177521A2/fr
Publication of EP4177521A3 publication Critical patent/EP4177521A3/fr
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Publication of EP4177521C0 publication Critical patent/EP4177521C0/fr
Publication of EP4177521B1 publication Critical patent/EP4177521B1/fr
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Classifications

    • 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
    • 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
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel 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
    • F23N1/022—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
    • F23N5/18—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05002—Valves for gaseous fuel supply lines
    • 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
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • 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
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking
    • F23N2227/16—Checking components, e.g. electronic
    • 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
    • F23N2231/12—Fail safe for ignition failures
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/02—Space-heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/04—Heating water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water

Definitions

  • the invention relates to a method for evaluating a quasi-steady-state pressure difference at a gas boiler that can be detected by a sensor, and a gas boiler that is designed to carry out the method.
  • Gas heaters are known in the prior art, in which a pressure difference is measured upstream of a main flow restrictor relative to a reference pressure by a sensor designed as a differential pressure sensor, and the fuel mass flow is regulated based on the pressure difference.
  • a gas boiler generally includes a mixing device for mixing one of a fuel inlet inflowing fuel and air flowing in from an air inlet to form a fuel-air mixture, a blower for sucking in the fuel and the air through the mixing device, a main quantity throttle for limiting a mass flow of the fuel into the mixing device, a control valve arranged upstream of the main quantity throttle for regulation a mass flow of the fuel into the mixing device and a safety valve arranged upstream of the control valve for interrupting the mass flow of the fuel.
  • the gas-air mixture can then be fed to a burner in which the mixture can be burned.
  • control valves in the prior art In order to control the pressure of the inflowing fuel, the control valves in the prior art often work as a mechanical-pneumatic gas valve in which a pressure difference is detected by a control membrane and which is arranged between two areas of different pressure.
  • pressure sensors are also used within the framework of a so-called “electronic control”, in which the pressures are recorded by separate sensors and the pressure values are evaluated electronically to determine the pressure difference.
  • electronic control in which the pressures are recorded by separate sensors and the pressure values are evaluated electronically to determine the pressure difference.
  • an electronically controllable control valve or gas valve is controlled or regulated.
  • the pressure upstream of the main volume throttle is measured with a differential pressure sensor, which measures the differential pressure or the pressure difference between two pressure decreases, compared to a reference pressure.
  • an electronic gas valve is usually controlled by a digital controller, which, for example, on a microcontroller or a another control device is implemented, and by which the determined offset pressure or the pressure difference is to be regulated to the desired or specified setpoint.
  • the term "electronic zero pressure control" is often used.
  • the function is limited to controlling the gas boiler based on the pressure difference without being able to provide additional functionalities.
  • the invention is therefore based on the object of overcoming the aforementioned disadvantages and providing a method by which faults in a gas boiler can be detected and evaluated in a simple and cost-effective manner.
  • a method for evaluating a quasi-steady-state pressure difference at a gas boiler that can be detected by a sensor.
  • the sensor is a differential pressure sensor or a mass flow sensor.
  • the gas boiler has a mixing device for mixing fuel flowing in from a fuel inlet and air flowing in from an air inlet to form a fuel-air mixture, a blower for sucking in the fuel and the air through the mixing device, a main volume throttle for limiting a Mass flow of fuel into the mixing device, a control valve arranged upstream of the main quantity throttle for controlling a mass flow of fuel into the mixing device, and a safety valve arranged upstream of the control valve for interrupting the mass flow of fuel.
  • the sensor detects a differential pressure between a pressure at a measuring point, which is arranged upstream of the main flow restrictor and downstream of the control valve, and a reference pressure at a reference measuring point and transmits this to evaluation electronics.
  • the evaluation electronics compare the differential pressure during a pre-purge phase, in which the safety valve is closed, with the differential pressure and, after the pre-purge phase, recognizes an error through the comparison.
  • the gas boiler In the pre-flushing phase, the gas boiler is flushed with air, as is known to those skilled in the art, without the gas being mixed in, which is made possible by the closed safety valve. In most cases, the pre-purge phase is carried out at the beginning of operation or when the gas boiler is initialized.
  • the error detection after the pre-flushing phase relates to all further operating phases or types after the pre-flushing of the gas boiler and in particular to a set-up operation in which the gas boiler can be calibrated and continuous operation of the gas boiler.
  • a quasi-stationary pressure difference is understood to mean a pressure difference that does not fluctuate or fluctuates only within a predetermined tolerance range. For example, a 1% fluctuation in the pressure difference around a mean value of the pressure difference can be understood as being quasi-stationary.
  • Various states or errors in the system can be recognized and/or checked for plausibility from known data stored in the evaluation electronics, which can be determined as part of a calibration of the gas heater or can be entered by a user, for example.
  • the determination of the status or error is carried out in particular by physical and logical considerations of the statuses and values prevailing in the system.
  • State detection using machine learning e.g. using neural networks, is also possible.
  • tolerance ranges or tolerance values in general can be generated or expanded using machine learning.
  • a basis for the proposed method is the signal from the differential pressure sensor, which, for example, measures the offset pressure p2 during normal operation of the “electronic zero pressure control”. If the gas type is known and the main quantity throttle is defined, the gas valve characteristic curve, for example, can be calibrated using the offset pressure.
  • the evaluation electronics recognize that a main quantity throttle used in the gas boiler does not correspond to the intended main quantity throttle and the main quantity throttle used is therefore an incorrect or incorrectly inserted main quantity throttle, what corresponds to the error to be detected.
  • the fuel used is preferably a characteristic of the mixing device and a guest valve characteristic of the control valve is known. These values are determined beforehand and/or stored in the evaluation electronics.
  • Deviation of the pair of values from the target characteristic curve of the control valve by the electronic evaluation system indicates that the control valve has not been calibrated or has been incorrectly calibrated.
  • the target characteristic curve of the control valve is shifted by the deviation and the actual characteristic curve is thus approximated.
  • control valve is not calibrated or is incorrectly calibrated, but that the control valve is calibrated in situ.
  • the actual characteristic it can be used as a target characteristic or measures can be taken to further approximate the actual characteristic to the target characteristic.
  • the fuel, the main quantity throttle used and the characteristics of the mixing device are known. These values are determined beforehand and/or stored in the evaluation electronics.
  • the evaluation electronics will detect an incorrect fuel, i.e. an error, if the actual fuel does not correspond to the target fuel.
  • the main quantity throttle used the characteristics of the mixing device and the gas valve characteristic curve of the control valve are known. These values are determined beforehand and/or stored in the evaluation electronics.
  • the evaluation electronics compare the differential pressure curve with a predetermined tolerance field and the error is detected if the pressure curve lies outside the tolerance field, whereby a differential pressure that does not increase over the predetermined time and thus a missing or too low fuel pressure pg and/or a incorrect or non-installed main flow restrictor is detected.
  • the fuel used, the main quantity throttle used, the characteristics of the mixing device and the gas valve characteristic curve of the control valve are preferably known for this purpose. These values are determined beforehand and/or stored in the evaluation electronics.
  • an advantageous variant of the method can provide that the error is a non-existent or non-connected sensor and/or a bad or non-existent connection of the sensor to the measuring point and/or the reference measuring point.
  • a pressure difference between the pressure at the measuring point, which is upstream of the main quantity throttle and downstream of the control valve, and a reference pressure at a reference measuring point is determined. From the evaluation electronics the sensor is recognized as absent or not connected and/or as having a poor or absent connection to the measurement point and/or the reference measurement point if the differential pressure is outside a predetermined tolerance range.
  • the fuel used, the main quantity throttle used, the characteristics of the mixing device and the gas valve characteristic curve of the control valve are preferably known. These values are determined beforehand and/or stored in the evaluation electronics.
  • the evaluation electronics recognizes a fault or when the Deviation is greater than a predetermined tolerance value, which is stored in particular in the evaluation electronics, that is, can be stored.
  • a further aspect of the invention relates to a gas boiler which is designed to carry out a method according to the invention.
  • FIG 1 shows schematically a part or a detail of a gas boiler, a Venturi mixer being shown as the mixing device 4, in which a blower 5 sucks air through an air inlet L from the environment at an air pressure p0.
  • the inflowing air and a fuel (gas) flowing in through the fuel supply G are mixed in the mixing device 4 to form a fuel-air mixture.
  • the fuel flowing in from the fuel supply G which is in particular a gas, flows through a safety valve 1, a control valve 2 and the main quantity throttle 3.
  • the safety valve 1 preferably has an open and a closed position, in which the flow of the fuel is blocked by the safety valve 1.
  • the control valve 2 is designed to control the volume flow of the fuel, so that the volume flow of the fuel through the control valve 2 to the mixing device 4 can be adjusted. By setting or controlling the volume flow of the fuel through the control valve 2, the mixing ratio of the fuel-air mixture can thus be adjusted.
  • At least one differential pressure sensor is also provided, which is designed to determine the differential pressure between the pressure p2 of the fuel upstream of the main quantity throttle 3 and downstream of the control valve 2 and a reference pressure, with the reference pressure preferably being the ambient pressure p0 or a pressure p1 of the Air in an air-carrying supply line to the mixing device 4 is.
  • the differential pressure sensor can have, for example, a respective pressure sensor or pressure transducer for detecting a respective pressure p0, p1, p2.
  • additional pressure sensors can be provided for detecting the additional pressures pg, p3 and p4, which can serve as reference pressure sensors for detecting a reference pressure or for checking the plausibility of the pressures p0, p1, p2.
  • the fuel-air mixture is conveyed by the fan 5 to a burner of the gas boiler, not shown, where the fuel-air mixture is burned.
  • an installed main flow restrictor 3 is to be detected by means of a differential pressure determined by the differential pressure sensor.
  • control pressure/Venturi characteristic of the system ie the gas heater
  • a Venturi mixer as the mixing device 4 is not absolutely necessary, a pressure reduction element upstream of the mixing point of air and fuel (gas) with known pressure reduction characteristics is sufficient.
  • the type of gas fuel type
  • the type of gas can be stored by the installer or at the factory on the evaluation electronics, or a sensor provided for this purpose detects the composition of the gas, for example at gas inlet G.
  • the gas mass flow that flows through the control valve 2 in the installed state can be deduced at a given position of the actuator of the control valve 2 .
  • the upstream pressure controller of the control valve 2 works ideally and the mass flow through the control valve 2 does not depend on the inlet pressure pg.
  • the offset pressure p2 upstream of the main flow restrictor 3 is measured, for example, with a pressure sensor as part of the differential pressure sensor.
  • the air density which influences the control pressure of the mixing device 4 for a given air mass flow, can be entered manually beforehand by the installer.
  • the air density can also be determined by a sensor. With an appropriate geometric arrangement, this can also be done by the sensor, with which the type of gas can be determined when the safety valve 1 is open.
  • a negative pressure pv which is generated by the mixing device 4 at a speed N of the blower 5, is measured by means of a pressure sensor at point p2 measured.
  • An air mass flow is calculated with the measured pressure p2 or pv and a function or table stored in the evaluation electronics for this system consisting of mixing device 4 and main quantity throttle 3 . Depending on the accuracy requirement, this calculation can be corrected with the air density.
  • the desired pre-control position of the actuator of the control valve 2 is initially approached with the speed N remaining the same, the ignition of the gas boiler is activated and the safety valve 1 is then opened. As soon as a combustible mixture is present at the ignition electrode of the gas boiler, the fuel-air mixture burns on the burner of the gas boiler and the pressure p2 stabilizes from a point in time t s , a quasi-steady state is present.
  • Further resistances can be, for example, deflections downstream of the main flow restrictor 3 and the openings at the point of the air-gas mixture ("gas pockets").
  • the speed N of the blower 5 can also be changed for the detection of the installed main volume throttle 3 in order to use several measuring points.
  • the pressure loss coefficient of the main flow restrictor 3 can be calculated using the gas mass flow determined via the gas valve characteristic curve and the pressure difference dp.
  • the pressure loss of the other flow resistances should also be taken into account in this calculation. Especially if the pressure loss is dominant over the main quantity throttle 3 compared to the total pressure loss dp, the installed main quantity throttle 3 (or the associated pressure loss coefficient) can be determined with sufficient accuracy.
  • the installed main quantity throttle 3 can also be detected without combustion of the gas-air mixture in the burner. It must be ensured at all times that the potentially combustible gas-air mixture is conveyed out of the gas boiler after a certain safety period by means of a safety purge (flushing) with the aid of the blower 5 .
  • Another prerequisite is that the measured pressure p2(ts) reaches a quasi-stationary state. If the measured pressure difference is completely outside a predetermined tolerance range, too little or no inlet pressure can be responsible for the faulty ignition.
  • an incorrectly calibrated control valve 2 is to be able to be recognized and the control valve 2 to be able to be calibrated during operation (in situ), if necessary.
  • a control pressure venturi characteristic of the system is known.
  • a Venturi mixer is not absolutely necessary as the mixing device 4; a pressure reduction element upstream of the mixing point of air and fuel with known pressure reduction characteristics as the mixing device 4 is sufficient.
  • the type of gas should be known. The type of gas can be selected by the installer or stored on the evaluation electronics at the factory or recognized by a corresponding sensor.
  • a known system of flow resistances downstream of the main quantity throttle 3 (deflections and gas pockets) and a main quantity throttle 3 with known pressure loss characteristics are advantageous for the in-situ calibration of the control valve 2 .
  • the installed main flow restrictor 3 can be stored by the installer or in the factory on the evaluation electronics, or the main flow restrictor 3 is mechanically/electronically/color-coded by the manufacturer so that the evaluation electronics, which evaluate the measured data, recognize the main flow restrictor 3.
  • a pressure difference pv is determined during a pre-purge phase and a differential pressure when the flame is ignited and in a quasi-stationary state.
  • the speed N of the blower 5 can also be changed here if necessary in order to be able to determine several measuring points. In the application, however, only one measuring point is often required to determine the offset pressure of the characteristic curve of control valve 2.
  • the flow (mass flow) through the control valve 2 can be calculated with the pressure difference dp determined in this way and a known total pressure loss characteristic of the main quantity throttle 3 and, if necessary, flow resistances arranged downstream.
  • the calibration of the control valve 2 when the gas heater is put into operation can also be carried out in principle without combustion of the gas-air mixture. It must be ensured at all times that the potentially combustible gas-air mixture is conveyed out of the gas boiler after a certain safety period by means of a safety purge (flushing) with the aid of the blower 5 .
  • the pressure difference p2(t s ) should be in a quasi-steady state.
  • the method described for calibrating the control valve 2 can also be used to calibrate the control valve 2 at the factory during production and not in situ when the gas boiler is started up. This calibration process can also be carried out with air flowing through the control valve 2 . If the in-situ calibration is carried out in production, the calibration parameters can be stored directly on the electronics of the control valve 2 without direct communication between the production facility and the electronics of the gas boiler.
  • a gas used as a fuel is to be checked for plausibility or a faulty gas is to be detected.
  • a control pressure venturi characteristic of the system is preferably known.
  • a Venturi mixer is not absolutely necessary as the mixing device 5 .
  • a pressure reduction element upstream of the mixing point of air and fuel as a mixing device 5 with known pressure reduction characteristics is sufficient.
  • the system of flow resistances downstream of the main flow restrictor 3 (deflections and gas pockets) is known and a main flow restrictor 3 with known pressure loss characteristics is used.
  • the installed main flow restrictor 3 can be stored on the evaluation electronics by the installer or at the factory.
  • the main flow restrictor 3 can also be coded mechanically/electronically/in terms of color in such a way that the evaluation electronics, which evaluate the measurement data, recognize the main flow restrictor 3 .
  • the gas mass flow flowing through the control valve 2 in the installed state can be inferred for a given position of the actuator of the control valve 2 .
  • the upstream pressure regulator of the control valve 2 works ideally and the mass flow through the control valve 2 does not depend on the inlet pressure pg of the gas.
  • the offset pressure p2 upstream of the main flow restrictor 3 is measured with a pressure sensor, which can be part of the differential pressure sensor.
  • the pressure sensor can either be installed upstream of the main flow restrictor 3 or installed on an electronic circuit board of other components and connected to a representative pressure measuring point upstream of the main flow restrictor 3 with hoses/pipes.
  • the air density which can influence the control pressure of the mixing device 4 for a given air mass flow, can be entered manually beforehand by a user. Alternatively, the air density can also be determined by a sensor.
  • the desired pre-control position of the actuator of the control valve 2 is initially approached with the speed N remaining the same, the ignition of the gas boiler is activated and the safety valve 1 is then opened. As soon as a combustible mixture is present at the ignition electrode of the gas boiler, the gas-air mixture burns on the burner of the gas boiler and the pressure p2 stabilizes from time ts, so that the pressure p2 or the differential pressure is in a quasi-steady state.
  • the speed N can be changed if necessary in order to use several measuring points.
  • the gas type or composition of the gas flowing in through the gas inlet G can be checked for plausibility.

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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)
EP22201795.6A 2021-10-20 2022-10-17 Procédé d'évaluation d'une différence de pression quasi stationnaire pouvant être obtenue par un capteur dans une chaudière à gaz et chaudière à gaz associée Active EP4177521B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021127225.4A DE102021127225A1 (de) 2021-10-20 2021-10-20 Verfahren zur Auswertung einer von einem Sensor erfassbaren quasi-stationären Druckdifferenz an einer Gastherme sowie zugehörige Gastherme

Publications (4)

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EP4177521A2 true EP4177521A2 (fr) 2023-05-10
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DE102021127225A1 (de) 2023-04-20
EP4177521C0 (fr) 2025-12-03
US20230118991A1 (en) 2023-04-20
EP4177521A3 (fr) 2023-08-02
CN115993203A (zh) 2023-04-21
US12455076B2 (en) 2025-10-28
EP4177521B1 (fr) 2025-12-03
KR20230056616A (ko) 2023-04-27
CN115993203B (zh) 2026-01-09

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