EP3499124A1 - Composant d'appareil de chauffage et procédé de réglage d'un débit volumétrique de carburant - Google Patents

Composant d'appareil de chauffage et procédé de réglage d'un débit volumétrique de carburant Download PDF

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Publication number
EP3499124A1
EP3499124A1 EP18205123.5A EP18205123A EP3499124A1 EP 3499124 A1 EP3499124 A1 EP 3499124A1 EP 18205123 A EP18205123 A EP 18205123A EP 3499124 A1 EP3499124 A1 EP 3499124A1
Authority
EP
European Patent Office
Prior art keywords
fuel
heater
valve
combustion
pressure
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Withdrawn
Application number
EP18205123.5A
Other languages
German (de)
English (en)
Inventor
Robbert DE BRUIN
Remko Voordendag
Gordy Koellmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3499124A1 publication Critical patent/EP3499124A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the invention relates to a heater component for a heater for adjusting a fuel flow.
  • the invention also relates to a heater with the heater component and a method of operating the heater.
  • heaters with a supported by a blower burner in which a combustion air flow, a fuel is mixed by means of a venturi.
  • the pressure of the combustion air sucked in by the fan drops off at a constriction of the venturi, so that the fuel is sucked in.
  • the fuel is provided by means of a pneumatic zero pressure valve at an ambient pressure, so that the fuel volume flow sucked through the Venturi increases as the combustion air flow flowing through the venturi increases. In this way, a largely constant fuel-air ratio of the fuel-air mixture supplied to the burner is ensured.
  • Such heaters have the disadvantage that the fuel-air ratio can not be easily changed or adjusted, for example, with a changed fuel grade and / or fuel quality.
  • the present invention describes a heater component, in particular a valve assembly, for a heater for adjusting a fuel volume flow.
  • the heater component has at least one automatic valve, for example a pneumatic valve, and an electric actuator.
  • the electric actuator is to provided to adjust the fuel flow in dependence on a combustion parameter.
  • a fuel-air ratio of a fuel-air mixture is adaptable, wherein the fuel-air mixture is composed of a combustion air and a fuel supplied via the fuel volume flow.
  • the fuel-air ratio is adaptable during operation of a heater. In this way, a largely optimal, especially clean combustion can be ensured.
  • the fuel-air ratio is adjustable as a function of a fuel grade and / or a fuel quality.
  • Heaters are preferably operated with a lean fuel-air mixture or with a combustion air surplus.
  • the fuel-air ratio is greater than one.
  • the fuel-air ratio of the fuel-air mixture is also referred to as lambda value or air ratio.
  • a fuel-air ratio greater than one particularly advantageous emission values are achieved during combustion, in particular a proportion of nitrogen oxides (NO x) is reduced.
  • An optimal value for the fuel-air ratio at which desired or predetermined emission values are achieved depends on different parameters, in particular on the fuel grade, the fuel quality and a combustion air quality.
  • a heater component is to be understood in particular as meaning a component, in particular a subassembly, of a heater.
  • the heater device may comprise a fluid line - in particular fuel line - which is provided in particular to at least partially direct the fluid flow - in particular fuel flow - and / or lead and / or adjust and advantageously supply the heating unit in at least one operating state.
  • the heater component is configured to provide the fuel to a fuel combustion air mixing device.
  • an automatic valve is to be understood in particular a control valve, which is intended, in at least one operating state, in particular a Volumetric flow of a flowing into the automatic valve and / or the automatic valve flowing through, in particular gaseous, fuel at least semi-automatically or preferably fully automatically adjust and / or to regulate.
  • the at least one automatic valve has at least one throttle element whose position and / or orientation and / or shaping can be actively changed, in particular as a function of at least one controlled variable.
  • at least one flow path along which the at least one automatic valve can be traversed by a fuel can be expanded and / or narrowed.
  • an automatic valve is provided to adjust the fuel flow.
  • An automatic valve has at least three parking positions for adjusting the fuel volume flow.
  • Under an automatic valve can be understood in particular an electrically and / or electromagnetically and / or pneumatically and / or hydraulically controllable control valve.
  • the automatic valve can be designed as a proportional valve, in particular a servo valve.
  • An example of an automatic valve is a pneumatic zero pressure regulator which provides a fuel pressure of the fuel flowing through the automatic valve to an ambient pressure.
  • Another example of an automatic valve is a differential pressure regulator, which adjusts the fuel pressure so that it differs from the ambient pressure by an adjustable pressure difference.
  • the automatic valve is an electronic control valve, which is intended to be controlled in particular as a function of a measured value or sensor value, in particular as a function of an air pressure measured value.
  • An electric actuator is to be understood in particular as an electrically operated adjusting element which is intended to set the fuel volume flow, in particular to a predefinable value.
  • the electric actuator may be, for example, an electric motor, in particular a stepper motor, if necessary with a transmission.
  • the electrical actuator may be provided to adjust an adjustable aperture.
  • the adjustable orifice is designed to adjust the fuel flow. It is also possible that the electrical actuator is intended to adjust an adjustable throttle.
  • the adjustable throttle is adapted to adjust the fuel flow, in particular to reduce. It is also conceivable that the electrical actuator is provided for adjusting a control valve - in particular an automatic valve.
  • the heater component preferably has a control unit which is set up to receive and process the combustion characteristic value.
  • the control unit is set up to send a control signal to the electrical actuator as a function of the combustion characteristic value, so that the electrical actuator adjusts the combustion volume flow accordingly.
  • the control unit and the electrical actuator are integrated in an assembly.
  • the control unit is a component of the heater and connected to a communication connection with the heater component or the electric actuator.
  • the communication connection is configured to transmit at least the control signal to the electrical actuator or to the heater component.
  • a combustion parameter is to be understood in particular to mean a parameter which is correlated in particular with combustion, in particular of the fuel / combustion air mixture.
  • An example of the combustion characteristic value is an ionization current which is measured on a flame of the heater.
  • a control and / or regulating unit of the heater at least based on the combustion characteristic to a presence and / or quality of the combustion are concluded and / or the presence and / or the quality of the combustion can be determined. It is advantageous, in particular by the control and / or regulating unit of the heater, from the combustion characteristic of a fuel grade and / or fuel quality determined.
  • the combustion characteristic value is correlated in particular with the fuel / air ratio of the fuel / combustion air mixture or the lambda value.
  • the combustion parameter corresponds to at least one or precisely one measured value representing the combustion and / or characterizing the combustion parameter or can be unambiguously assigned to such a measured value.
  • the combustion parameter can be measured with a sensor. Examples of a combustion mapping and / or characterizing The measured value is a combustion signal-in particular a light intensity-and / or a pollutant emission and / or a temperature and / or advantageously an ionization signal.
  • the electric actuator adjusts a fuel volume flow as a function of a combustion characteristic
  • a flow path along which the heater component can be flowed through by the fuel is expanded or contracted in accordance with a combustion characteristic value, in particular a currently present combustion characteristic value.
  • the heater component in particular a control and / or regulating unit and / or is connected to a control and / or regulating unit, which is intended to evaluate the combustion characteristic and, if necessary, in a position and / or orientation of the electrical Actuator according to the combustion characteristic changing control and / or control signal to transfer.
  • the automatic valve is provided to provide a fuel with a fuel pressure that depends on a predeterminable reference pressure-for example an external air pressure-this has the advantage that the fuel-air ratio changes with a changing combustion air flow-for example if the heating power changes - remains largely constant.
  • a predeterminable reference pressure for example an external air pressure-this has the advantage that the fuel-air ratio changes with a changing combustion air flow-for example if the heating power changes - remains largely constant.
  • the fuel-air ratio with a changing combustion air flow does not have to be adjusted or only slightly by the electric actuator. In this way, the heater is particularly reliable operable.
  • a largely constant fuel-air ratio is advantageous, as long as relevant parameters are largely constant - especially as long as a substantially constant fuel quality is present.
  • the heater component is further improved when the automatic valve has an offset controller which is intended to be adjusted by the electric actuator, wherein the offset controller is provided to a Adjust pressure difference between the fuel pressure and the reference pressure.
  • the heater component by means of the automatic valve quickly respond to changing conditions or parameters, in particular air pressure fluctuations and / or a change in the combustion air flow - for example, due to a change in power demand.
  • the electric actuator acting on the offset controller makes adjustments in the case of changed parameters, which can be detected as a function of the combustion characteristic value, in particular to changed parameters which can not be taken into account by the use of the automatic valve, for example a change in the fuel quality.
  • the heater component is intended to adjust the fuel-air ratio in normal operation largely by the automatic valve and the electric actuator, if necessary, is provided for occasional corrections or adjustments of the fuel-air ratio.
  • the heater component is intended to adjust the fuel flow largely through the automatic valve and the electric actuator by adjusting the offset regulator occasional corrections or adjustments in the adjustment of the fuel flow, especially when changing the fuel.
  • the automatic valve is a pneumatic control valve, in particular a pneumatic zero pressure valve or differential pressure valve
  • a pneumatic zero pressure valve or differential pressure valve can largely immediately respond to pressure changes, in particular faster than 1 second, advantageously faster than 0.1 seconds.
  • This is particularly advantageous in comparison to a heater component which has only one electronic control valve which is regulated as a function of a combustion characteristic value.
  • Such a heater component takes some time to properly set the electronic control valve, since to check how a changed position of the electronic control valve affects the combustion characteristic, it must wait until the fuel is transported from the heater component to the burner.
  • the setting of the fuel flow with one or alone Mainly controlled by the combustion parameter heater component with an electronic control valve may take several seconds.
  • a pneumatic control valve in particular a pneumatic zero pressure valve or differential valve allows reliable control or regulation of the fuel volume flow when the fuel is sucked with at least a hereinsaug réelle, for example by a pressure drop across a Venturi or other throttle through which the combustion air flows. Below the adoptedinsaug réelles the fuel flow is no longer adjusted with a necessary accuracy by the pneumatic control valve. This disadvantage can be remedied with the aid of the electric actuator. It is possible that the electrical actuator is intended to compensate for a lack of accuracy of the pneumatic control valve, so that the set by the heater component fuel flow occurs with the necessary accuracy.
  • a pneumatic automatic valve with an electric actuator regulated according to the combustion characteristic combines the advantages of a pneumatically controlled system with the advantages of electronic control according to the combustion characteristic.
  • a pneumatically controlled system has the advantage that it can respond very quickly and reliably to pressure fluctuations and / or power modulation.
  • An electronically controlled system has the advantage that an optimal fuel-air ratio can be adjusted, even with variable external parameters, such as a variable fuel quality.
  • the heater component comprises the automatic valve and an electronic control valve having the electric actuator.
  • the heater component preferably has a pneumatic automatic valve and the electronic control valve.
  • the electronic control valve and the automatic valve are provided to jointly adjust the fuel flow.
  • the electronic control valve and the automatic valve fluidly connected in series.
  • the electronic control valve and the automatic valve act on the same fuel flow.
  • the electronic control valve and the automatic valve can each be designed as separate valves, each with its own housing. It is also conceivable that the electronic control valve and the automatic valve have a common housing or are arranged in a common housing.
  • the electronic control valve and the automatic valve can be designed as a valve assembly or as a double valve or multiple valve.
  • the electronic control valve allows adjustments to changed parameters, which can be detected as a function of the combustion characteristic, in particular to changed parameters which can not be taken into account by the use of the automatic valve, for example a change in the fuel quality.
  • the heater component is intended to adjust the fuel-air ratio in normal operation largely through the automatic valve and the electronic control valve, if necessary, is provided for occasional corrections or adjustments of the fuel-air ratio.
  • the heater component is intended to adjust the fuel flow largely through the automatic valve and the electronic control valve occasional corrections or adjustments in the adjustment of the fuel flow, especially when changing the fuel grade.
  • An occasional correction by the electronic control valve or the electric actuator is to be understood that the electronic control valve or the electric actuator is used in a control mode on average for less than 10% of all changes in the fuel flow, preferably less than 5%, especially preferably less than 1%.
  • the electronic control valve may also be designed as an electronically adjustable diaphragm and / or as an electronically adjustable throttle in alternative embodiments.
  • the heater component is further improved when the combustion characteristic is an ionization current.
  • the ionization current is preferably from an ionization electrode detected at a flame of the burner.
  • the ionization current is a measure of a conductivity of the flame.
  • the ionization current allows conclusions about a quality of the combustion.
  • the fuel-air ratio can be determined from the ionization current.
  • the ionization current is particularly suitable for reliably determining the fuel-air ratio, since the ionization current has a characteristic and advantageous dependence on the fuel-air ratio.
  • the ionization current has a maximum at a stoichiometric fuel-air ratio - ie at a fuel-air ratio or lambda value of one.
  • it is particularly reliably possible to determine a calorific value or calorific value or Wobbe index of the fuel In this way it is possible to determine the fuel grade and / or the fuel quality.
  • the combustion characteristic value is a sensor signal from a temperature sensor-in particular for detecting a flame temperature and / or exhaust gas temperature-and / or from a sensor for detecting a concentration-in particular in exhaust gases-from O 2 and / or CO and / or CO 2 is.
  • the electric actuator is provided at least for a fine control of the fuel volume flow, in particular for a change in the fuel volume flow by less than 15%, preferably less than 5%, particularly preferably less than 1%. It is conceivable that the automatic valve is provided for coarse regulation of the fuel volume flow, in particular for a change in the fuel volume flow of more than 1%, preferably more than 5%, particularly preferably more than 15%.
  • the electric actuator is provided for at least a fine control of the fine volume control of the fuel volume flow, in particular for a change in the fuel volume flow by less than 15%, preferably less than 5%, more preferably less than 1%, when the fuel is sucked in at least at the minimum suction pressure. If the fuel is at a pressure that is smaller than the amount practitioneransaug Kunststoff, the electric actuator for all changes in the fuel flow is provided or for all necessary and / or intended changes in the fuel flow.
  • the heater component is intended to adjust the fuel flow largely through the automatic valve and the electric actuator is provided for occasional corrections or adjustments in the adjustment of the fuel flow, especially when changing the fuel grade.
  • Another aspect of the present invention is a heater with a blower assisted burner, a sensor for detecting a combustion characteristic - in particular an ionization electrode -, a fuel-air mixing device - in particular a Venturi - and a heater component according to the present invention.
  • the heater with the heater component allows a particularly fast and accurate control of combustion.
  • the heater can be operated optimally for the most part at any time. In this way, a low-maintenance and safe operation of the heater is guaranteed.
  • a further aspect of the present invention is a method for operating the heater with a heater component according to the present invention, in which a heating operation is controlled by means of the electrical actuator in dependence on the measured combustion characteristic value.
  • the method offers the advantage that the heater can be operated in an environmentally friendly manner.
  • the method is further improved if the fuel volume flow is adjusted by means of the electrical actuator so that the combustion characteristic assumes a desired combustion characteristic value. This is a particularly simple and reliable method to ensure optimal combustion.
  • the desired combustion characteristic value is a predetermined nominal combustion characteristic value.
  • the desired combustion characteristic value is in particular one in the heater component and / or in the heater - for example, in a memory a control unit - stored value.
  • the nominal combustion characteristic value may be a value determined in laboratory tests. It is also possible for the desired combustion characteristic value to be determined by a calibration method largely carried out on the heater.
  • the desired combustion characteristic value is selected as a function of at least one operating parameter, particularly preferably as a function of a current heating power of the heater.
  • the desired combustion characteristic value can be determined from a characteristic curve stored in a memory, wherein the characteristic curve assigns the nominal combustion characteristic value to the at least one operating parameter.
  • the method is further improved when the heating operation is adjusted by means of the electric actuator to different fuel types and / or fuel qualities.
  • the heater can be adjusted during operation automatically to a new fuel grade or a changed fuel quality. There is no manual adjustment, for example in the context of maintenance and / or inspection, necessary. This increases the user comfort of the heater.
  • the electric actuator is adjusted by the electric actuator at predetermined calibration times, preferably at regularly arranged calibration times, this has the advantage that the fuel volume flow is regulated or adjusted mainly by the automatic valve.
  • the electrical actuator ensures the fine regulation of the fuel volume flow at the calibration times. In this way, both precise and fast control or adjustment of the fuel flow is possible.
  • the heater can be operated safely and conveniently.
  • the calibration times can be chosen arbitrarily.
  • the calibration times are preferably stored in the control unit.
  • the calibration times are arranged regularly, for example with a spacing of 1 second, 5 seconds, 15 seconds, 30 seconds or 60 seconds.
  • the distance between the calibration times depends on operating parameters and / or on an operating state of the heater. For example it is It is conceivable that the distance between the calibration times is reduced if the fuel is sucked in at a pressure that is smaller than the minimum suction pressure and / or if the heating system is operated with a heating power that is below a predefinable minimum power. It is also possible that the distance of the calibration times is reduced when operating parameters change, for example, when the heating power is changed sufficiently strong.
  • FIG. 1 shows a gas heater designed as a heater 10.
  • the heater 10 has a heater component 12.
  • the heater component 12 includes an automatic valve 14 and an electronic control valve 16.
  • the electronic control valve 16 has an electric actuator 18.
  • the automatic valve 14 is designed as a pneumatic zero pressure valve.
  • the automatic valve 14 provides a Fuel 22 ready with a fuel pressure that largely corresponds to a currently existing ambient pressure.
  • the fuel 22 has at an outlet opening 24 of the automatic valve 14 largely the value of the current ambient pressure.
  • the electronic control valve 16 is configured to set a fuel volume flow 26.
  • the heater 10 has a burner 30 supported by a fan 28 and a fuel-air mixing device to 32.
  • the fuel-air mixing device 32 is formed in the embodiment as a Venturi 34.
  • the venturi 34 is connected to the blower 28.
  • the fan 28 sucks in a combustion air 36.
  • a combustion air stream 38 flows through the venturi 34.
  • the venturi 34 has a constriction 40. At the constriction 40, a pressure of the combustion air 36 drops. The faster the combustion air 36 is sucked in by the blower 28 or the faster the combustion air flow 38, the more the pressure of the combustion air 36 drops at the constriction.
  • the venturi 34 has a fuel port at the throat 40.
  • the fuel port is connected to the heater component 12 via a fuel line 42.
  • the fuel 22 is sucked in by the vacuum prevailing at the constriction 40.
  • the fuel 22 mixes in the Venturi with the combustion air stream 38 to a fuel-air mixture 44th
  • the fuel-air mixture 44 flows into the burner 30.
  • the fuel-air mixture 44 is burned by the burner 30 with a flame 46.
  • a sensor for detecting a combustion characteristic is an ionization electrode 48.
  • the combustion characteristic is an ionization current.
  • the resulting during the combustion process in the burner exhaust gases 50 are discharged via an exhaust pipe 52.
  • the ionization electrode 48 is connected to a communication line with a control unit 54.
  • the control unit 54 is configured to receive and supply measured values of the ionization current determined by the ionization electrode 48 to process.
  • the control unit 54 has a memory, a computing unit and interfaces for data exchange - in particular with components of the heater 10 - on.
  • the control unit 54 is connected to the electric actuator 18 of the heater component 12 by a communication line.
  • the control unit 54 is configured to transmit control signals to the electric actuator 18. In particular, the control unit 54 is set up to control the electric actuator 18 as a function of the received ionization current.
  • the control unit 54 is connected to the communication line with the blower 28.
  • the control unit 54 is configured to transmit control signals to the blower 28.
  • the control unit 54 is configured to set a desired combustion air flow 38 via a control signal to the blower 28.
  • the combustion air stream 38 may be suddenly changed, for example, due to a suction induced by a wind 56 on the exhaust pipe 52. This also changes the negative pressure at the constriction 40.
  • the automatic valve 14 allows a largely immediate adaptation to the new pressure conditions.
  • the automatic valve 14 controls the fuel pressure at the outlet port 24 largely immediately at the current ambient pressure. In this way, a fuel-air ratio of the fuel-air mixture is largely kept substantially constant immediately.
  • FIG. 2 showed an alternative embodiment of the heater component 12.
  • the heater component 12 includes a pneumatic differential pressure valve.
  • the pneumatic differential pressure valve is an automatic valve 14.
  • the automatic valve 14 has a movable closure 58.
  • the fuel volume flow 26 flowing through the automatic valve 14 is dependent on a position of the closure 58. In the in FIG. 2 illustrated position of the shutter 58, the automatic valve 14 is fully closed.
  • the closure 58 is largely continuously adjustable. With the closure 58, all values of the fuel volume flow 26 are between a maximum fuel volume flow 26 and a fuel flow 26 with zero value - with a fully closed closure 58 - adjustable.
  • the position of the shutter 58 is adjustable in response to a pressure difference between the fuel pressure at the outlet port 24 and the outside air pressure.
  • the automatic valve 14 has an open air duct 60, which is connected to an external air. In this way, the position of the shutter 58 is adjustable in dependence on the external air pressure.
  • An offset regulator 62 is provided to adjust the differential pressure between the outside air pressure and the fuel pressure at the outlet port 24.
  • the offset controller 62 is adjustable by an electric actuator 18.
  • the electric actuator 18 is in the in FIG. 2 In the embodiment shown, an electric motor which is set up to linearly adjust the offset controller 62.
  • FIG. 3 shows a method 64 for operating the heater 10.
  • the control unit 54 sends the fan 28, a control signal in response to a requested or set heating power.
  • the control signal corresponds to a fan speed.
  • a current combustion characteristic value is determined by the ionization electrode 48 and transmitted to the control unit 54.
  • the combustion characteristic value is determined largely continuously by the ionization electrode 48.
  • the control unit 54 checks whether the current combustion characteristic value corresponds to a desired combustion characteristic value stored in the control unit 54.
  • a characteristic curve is stored which assigns the setpoint combustion characteristic value to the currently set fan speed.
  • the control unit stores the combustion characteristic value received by the ionization electrode 48 and checks whether an average of the stored combustion parameter, averaged over the last 5 seconds, deviates by more than 5% from the nominal combustion parameter. If so, the method continues with step 70.
  • step 70 the control unit 54 sends a control signal to the electric actuator 18. If the current combustion characteristic value indicates that the fuel / air ratio is too high, the electric actuator 18 is activated so that the fuel volume flow 26 is increased.
  • the fuel-air ratio is the ratio of a combustion air amount to a fuel amount. The larger the fuel-air ratio, the leaner the fuel-air mixture or the greater a proportion of combustion air. If the current combustion characteristic value indicates that the fuel / air ratio is too small, the electric actuator 18 is activated in such a way that the fuel volume flow 26 is reduced.
  • the combustion characteristic value is the ionization current.
  • the heater is operated with a fuel-air ratio greater than one, preferably with a fuel-air ratio of 1.3. If the combustion characteristic value is greater than the nominal combustion characteristic value, then the fuel / air ratio is too small or the fuel / air mixture is too rich. If the combustion characteristic value is smaller than the nominal combustion characteristic value, the fuel / air ratio is too high or the fuel / air mixture too lean.
  • step 70 is performed at calibration times.
  • the calibration times are regularly arranged at a distance of 5 seconds to the next calibration time.

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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)
EP18205123.5A 2017-12-12 2018-11-08 Composant d'appareil de chauffage et procédé de réglage d'un débit volumétrique de carburant Withdrawn EP3499124A1 (fr)

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DE102017222437.1A DE102017222437A1 (de) 2017-12-12 2017-12-12 Heizgerätkomponente und Verfahren zur Einstellung eines Brennstoffvolumenstroms

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EP3499124A1 true EP3499124A1 (fr) 2019-06-19

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EP3772614A1 (fr) * 2019-08-07 2021-02-10 Rinnai Corporation Appareil de prémélange
EP4180718A1 (fr) * 2021-11-11 2023-05-17 BDR Thermea Group B.V. Procédé de commande d'une chaudière à gaz

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DE102021106987A1 (de) 2021-03-22 2022-09-22 Vaillant Gmbh Verfahren und Anordnung zur Beeinflussung eines Volumenstromes durch einen Strömungsweg für Brenngas zu einem Heizgerät
DE102022101002A1 (de) 2022-01-17 2023-07-20 Ebm-Papst Landshut Gmbh Hauptmengenventil zur zweistufigen Einstellung einer Hauptmenge eines zu einem Brenner strömenden Gases

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3772614A1 (fr) * 2019-08-07 2021-02-10 Rinnai Corporation Appareil de prémélange
EP4180718A1 (fr) * 2021-11-11 2023-05-17 BDR Thermea Group B.V. Procédé de commande d'une chaudière à gaz
WO2023083734A1 (fr) * 2021-11-11 2023-05-19 Bdr Thermea Group B.V. Procédé de commande de chaudière à gaz

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