EP3260777B1 - Method for detecting a blockade of a flue gas discharge of a burner system and burner system - Google Patents

Method for detecting a blockade of a flue gas discharge of a burner system and burner system Download PDF

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Publication number
EP3260777B1
EP3260777B1 EP16175599.6A EP16175599A EP3260777B1 EP 3260777 B1 EP3260777 B1 EP 3260777B1 EP 16175599 A EP16175599 A EP 16175599A EP 3260777 B1 EP3260777 B1 EP 3260777B1
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EP
European Patent Office
Prior art keywords
burner system
volumetric flow
test
burner
volume flow
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EP16175599.6A
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German (de)
French (fr)
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EP3260777A1 (en
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Alper Attias
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Bosch Termoteknik Isitma ve Klima Sanayi Ticaret AS
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Bosch Termoteknik Isitma ve Klima Sanayi Ticaret AS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—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
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2213/00—Chimneys or flues
    • F23J2213/70—Safety arrangements
    • 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
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed

Definitions

  • a method for the detection of a blockage of an exhaust gas discharge of a burner system, in which at least one pressure characteristic value within the exhaust gas discharge for the detection of the blockage is detected and / or evaluated, has already been proposed.
  • the WO 2013/117516 A1 discloses a method for controlling combustion in a burner, comprising the steps of specifying a setpoint for an air blower or a gas valve, calculating an optimal pressure difference between an air path and a gas path according to a desired gas-air ratio, detecting an actual pressure difference, regulating the gas valve or air blower, that the actual pressure difference takes on the value of the optimal pressure difference.
  • CA 2544994 and US 6234164 each disclose methods and burner devices with blockage detection.
  • the invention is based on a method for detecting a blockage of an exhaust gas discharge of a burner system, in which at least one pressure characteristic value is detected and / or evaluated for the detection of the blockage, wherein a test volume flow is generated for the detection of the blockage, which is greater than an ignition volume flow of the burner system ,
  • a fan of the burner system is temporarily operated to generate the test volume flow at a speed which is above a speed to generate the ignition volume flow.
  • a test volume flow can advantageously be generated simply by using a fan of the burner system.
  • test volume flow be reduced to the ignition volume flow before the burner system is ignited.
  • test volume flow is reduced to ignite the burner system if the limit value is maintained by the pressure characteristic value during the presence of the test volume flow so that it corresponds to the flow value of the ignition volume flow.
  • the burner system can advantageously be easily and / or quickly switched from a test operation to an ignition operation.
  • a “burner system” is to be understood in particular to mean a system which is intended to convert energy, in particular bioenergy and / or preferably fossil energy, into heat, in particular by means of a combustion process.
  • “Provided” is to be understood in particular to be specially programmed, designed and / or equipped. The fact that an object is provided for a specific function should in particular be understood to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.
  • the burner system at least one burner, has at least one blower for supplying combustion air and at least one fuel control valve for supplying a fuel.
  • the burner is particularly intended to burn a mixture, in particular a fuel mixture of combustion air and a fuel.
  • the burner can in particular be designed as a power-modulating gas fan burner.
  • a “fuel mixture” is to be understood in particular as an ignitable mixture of a fuel and a combustion air which is intended to be fed to a burner of a burner system for carrying out a combustion process.
  • a “fuel” is preferably a gas or gas mixture containing hydrocarbons, preferably a natural gas or a natural gas mixture, in particular a natural gas, a liquid gas or a biogas, which comprises at least one alkane, in particular methane, ethane, propane and / or butane , are understood.
  • exhaust gas discharge is to be understood in particular to mean a hollow line or a hollow line system which is provided for discharging a combustion exhaust gas from a burner system, in particular from a combustion chamber of a burner system.
  • a “pressure characteristic value” is to be understood in particular as a characteristic value which contains at least information about a pressure within the exhaust gas discharge of the burner system. The pressure characteristic value is recorded by means of a pressure switch within the exhaust gas discharge. On the basis of the pressure characteristic, it is concluded that the exhaust gas discharge is blocked.
  • a “blockage of the exhaust gas discharge” is to be understood in particular to mean that a gas flow through the exhaust gas discharge, in particular due to contamination and / or foreign bodies, is inhibited such that combustion exhaust gases can no longer be discharged to a sufficient extent.
  • test volume flow is to be understood in particular to mean a volume flow which is generated exclusively for detection to block the exhaust gas discharge.
  • the test volume flow flows through the entire burner system.
  • the test volume flow corresponds in particular at least essentially a volume flow that can be generated within the burner system, in particular by means of a fan of the burner system.
  • the test volume flow is preferably a pure air volume flow.
  • the test volume flow has at least essentially no admixtures of a fuel.
  • an “ignition volume flow” is to be understood in particular to mean a volume flow which is required for optimal ignition of the burner system, in particular for igniting a burner of the burner system.
  • the ignition volume flow is in particular between a minimum volume flow that can be generated within the burner system and a maximum volume flow that can be generated within the burner system.
  • the ignition volume flow is preferably an air volume flow or a fuel-air volume flow.
  • the ignition volume flow at the start of an ignition process is a pure air volume flow, to which a fuel is added in the course of the ignition process.
  • the pressure characteristic value is recorded and / or evaluated during the presence of the test volume flow, whereby a blockage of the exhaust gas discharge can be inferred directly from the pressure characteristic value.
  • a disturbance in a gas flow within the exhaust gas discharge caused in particular by a blockage is detected and an increase in the pressure characteristic value above a setpoint value, in particular, is recorded and evaluated in such a way that a blockage in the exhaust gas discharge is reliably determined.
  • Such an embodiment can provide an improved method for detecting a blockage in an exhaust gas discharge of a burner system.
  • the test volume flow generated for the detection of a blockage which is larger than an ignition volume flow of the burner system, advantageously achieves safe and / or reliable detection of blockages.
  • blockages can also advantageously be detected, which would otherwise only be detectable when the burner system is operating at full load.
  • Advantageously safe operation of a burner system can be achieved by early detection of blockages in the exhaust gas discharge.
  • test volume flow be generated after a burner operation of the burner system is requested.
  • the test volume flow is generated in particular immediately after a burner operation of the burner system has been requested.
  • the generation of the test volume flow is in particular independent of the required burner output. In this way, an advantageous early detection of a blockage of the exhaust gas discharge can be achieved.
  • test volume flow is generated before the burner system is ignited.
  • the burner system is ignited after an evaluation of the pressure characteristic value recorded during the presence of the test volume flow. In this way, blockages of the exhaust gas discharge can advantageously be detected before the burner system is ignited.
  • the burner system be put out of operation when the pressure value exceeds a limit value while the test volume flow is present.
  • the fact that the burner system is “put out of operation” is to be understood in particular to mean that the burner system is in particular put into a fault mode in which in particular the inflow of fuel into the burner system and ignition of the burner system is prevented and / or completely switched off ,
  • an operator and / or operator of the burner system can be given an error and / or warning message when the pressure value exceeds a limit value, which indicates that there is a blockage in the exhaust gas discharge.
  • advantageously safe operation of the burner system can be achieved.
  • an enrichment of an ambient air with combustion exhaust gases, in particular with carbon monoxide which can no longer be sufficiently removed due to a blockage of the exhaust gas discharge, can advantageously be prevented.
  • a burner device is proposed with a blower and a test unit for detecting a blockage of an exhaust gas discharge of a burner system, the test unit having at least one pressure sensor which is provided for detecting at least one pressure characteristic value, the test unit being intended for detecting the Blockade to generate a test volume flow that is greater than an ignition volume flow of the burner system.
  • a “test unit” is to be understood in particular as a unit which is designed as a hardware unit and / or at least partially as a software unit and is intended to record and evaluate the pressure parameter in particular directly, in particular by means of sensors and / or sensors, as an operating measured value.
  • the test unit can be at least partially integrally formed with and / or connected to a control and / or regulating unit of the burner system.
  • a “control and / or regulating unit” is to be understood in particular as a unit with at least one control electronics.
  • Control electronics is to be understood in particular to mean a unit with a processor unit and with a memory unit and with an operating program stored in the memory unit.
  • the pressure sensor is designed as a pressure switch. The pressure sensor is set up to record the pressure characteristic value within the exhaust gas discharge.
  • the test unit is intended to control a fan of the burner system directly or indirectly, in particular via the control and / or regulating unit, in order to generate the test volume flow.
  • the test volume flow generated for the detection of a blockage which is greater than an ignition volume flow of the burner system, advantageously achieves safe and / or reliable detection of blockages.
  • blockages can also advantageously be detected, which would otherwise only be detectable when the burner system is operating at full load.
  • Advantageously safe operation of a burner system can be achieved by early detection of blockages in the exhaust gas discharge.
  • FIG. 1 shows a burner system 10 designed as a gas burner system.
  • the burner system 10 comprises a burner 24, a blower 14 and an exhaust gas discharge 20.
  • a gaseous fuel 28, for example a natural gas is fed to the burner system 10 via a fuel feed line 26.
  • Combustion air 32 is fed to the burner system 10 via a combustion air supply line 30.
  • the fuel 28 and the combustion air 32 are mixed to form an ignitable fuel mixture 34 and fed to the burner 24.
  • the fuel mixture 34 is supplied by means of the blower 14 connected upstream of the burner 24.
  • the combustion exhaust gases 36 which arise in the burner 24 during the combustion process are discharged via the exhaust gas discharge 20.
  • the burner system 10 has a valve 38 which is arranged in the fuel feed line 26.
  • the valve 38 is preferably designed as an electronic control valve.
  • the valve 38 is provided to regulate a fuel volume flow 40.
  • the burner system 10 has a burner device 16 with a test unit 18 for detecting a blockage 12 of an exhaust gas discharge 20.
  • the test unit 18 can in particular be formed at least partially in one piece with a control and / or regulating unit (not shown here) of the burner system 10 and / or be connected to it.
  • the test unit 18 has a pressure sensor 22 which is provided to detect at least one pressure characteristic value within the exhaust gas discharge 20.
  • the pressure sensor 22 can in particular be designed as an absolute pressure sensor, a differential pressure sensor and / or preferably as a pressure switch.
  • the test unit 18 is provided to generate a test volume flow for the detection of the blockage 12, which is larger than an ignition volume flow of the burner system 10.
  • the test unit 18 is provided to control the blower 14 to generate the test volume flow.
  • the fan 14 of the burner system 10 is temporarily operated to generate the test volume flow at a speed which is above a speed to generate the ignition volume flow.
  • the test unit 18 is provided to detect and evaluate the characteristic pressure value during the presence of the test volume flow by means of the pressure sensor 22. On the basis of the pressure characteristic value, a blockage 12 of the exhaust gas discharge can be made directly 20 to be closed.
  • the test unit 18 detects a disturbance of a gas flow within the exhaust gas discharge 20 caused by a blockage 12, and increases the pressure characteristic value above a setpoint value stored in the test unit 18 and evaluates it so that a blockage 12 of the exhaust gas discharge pipe 20 can be reliably determined.
  • FIG. 2 shows a flowchart of a method for detecting a blockage 12 of the exhaust gas discharge 20 of the burner system 10, in which the pressure value for detecting the blockage 12 is detected and / or evaluated.
  • the test volume flow is generated in a method step 42.
  • the test volume flow is greater than the ignition volume flow of the burner system 10.
  • the test volume flow is generated immediately after request 44 of burner operation of the burner system 10 and before the burner system 10 is ignited.
  • the fan 14 of the burner system 10 for generating the test volume flow is temporarily operated at a speed which is above a speed for generating the ignition volume flow.
  • the valve 38 is closed during the generation of the test volume flow.
  • the test volume flow is a pure air volume flow.
  • a further method step 46 the pressure characteristic value is recorded and evaluated while the test volume flow is present.
  • the burner system 10 is deactivated in a further method step 48 if the pressure characteristic value exceeds a limit value while the test volume flow is present. If the limit value has not been exceeded, the test volume flow is reduced to the ignition volume flow in a further method step 50 before ignition of the burner system 10.
  • Valve 38 is closed while the test volume flow is reduced to the ignition volume flow.
  • the ignition volume flow set in this way is initially a pure air volume flow.
  • the valve 38 is opened in a further method step 54 and the burner 24 is ignited. After opening the valve 38, the ignition volume flow is a fuel-air volume flow required to ignite the burner 24. After the burner 24 has been ignited, the burner system 10 changes to a normal burner operation 52.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

Stand der TechnikState of the art

Es ist bereits ein Verfahren zur Detektion einer Blockade einer Abgasabführung eines Brennersystems, bei welchem zumindest ein Druckkennwert innerhalb der Abgasabführung zur Detektion der Blockade erfasst und/oder ausgewertet wird, vorgeschlagen worden.A method for the detection of a blockage of an exhaust gas discharge of a burner system, in which at least one pressure characteristic value within the exhaust gas discharge for the detection of the blockage is detected and / or evaluated, has already been proposed.

Die WO 2013/117516 A1 offenbart ein Verfahren zur Regelung einer Verbrennung in einem Brenner mit den Schritten Vorgeben eines Sollwerts für ein Luftgebläse oder ein Gasventil, Berechnen einer optimalen Druckdifferenz zwischen einem Luftweg und einem Gasweg entsprechend einem gewünschten Gasluftverhältnis, Erfassen einer tatsächlichen Druckdifferenz, Regeln des Gasventils oder Luftgebläses so, dass die tatsächliche Druckdifferenz den Wert der optimalen Druckdifferenz annimmt. Auch CA 2544994 und US 6234164 offenbaren jeweils Verfahren und Brennervorrichtung mit Detektion einer Blockade.The WO 2013/117516 A1 discloses a method for controlling combustion in a burner, comprising the steps of specifying a setpoint for an air blower or a gas valve, calculating an optimal pressure difference between an air path and a gas path according to a desired gas-air ratio, detecting an actual pressure difference, regulating the gas valve or air blower, that the actual pressure difference takes on the value of the optimal pressure difference. Also CA 2544994 and US 6234164 each disclose methods and burner devices with blockage detection.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung geht aus von einem Verfahren zur Detektion einer Blockade einer Abgasabführung eines Brennersystems, bei welchem zumindest ein Druckkennwert zur Detektion der Blockade erfasst und/oder ausgewertet wird, wobei zur Detektion der Blockade ein Prüfvolumenstrom erzeugt wird, welcher größer ist als ein Zündvolumenstrom des Brennersystems.The invention is based on a method for detecting a blockage of an exhaust gas discharge of a burner system, in which at least one pressure characteristic value is detected and / or evaluated for the detection of the blockage, wherein a test volume flow is generated for the detection of the blockage, which is greater than an ignition volume flow of the burner system ,

Ein Gebläse des Brennersystems wird zur Erzeugung des Prüfvolumenstroms temporär mit einer Drehzahl betrieben, welche oberhalb einer Drehzahl zur Erzeugung des Zündvolumenstroms liegt. Durch die Verwendung eines Gebläses des Brennersystems kann vorteilhaft einfach ein Prüfvolumenstrom erzeugt werden.A fan of the burner system is temporarily operated to generate the test volume flow at a speed which is above a speed to generate the ignition volume flow. A test volume flow can advantageously be generated simply by using a fan of the burner system.

Es wird vorgeschlagen, dass der Prüfvolumenstrom vor einer Zündung des Brennersystems auf den Zündvolumenstrom reduziert wird. Insbesondere wird der Prüfvolumenstrom, bei Einhalten des Grenzwerts durch den Druckkennwert während des Vorliegens des Prüfvolumenstroms, zur Zündung des Brennersystems derart reduziert, dass er dem Durchflusswert des Zündvolumenstroms entspricht. Hierdurch kann das Brennersystem vorteilhaft einfach und/oder schnell von einem Prüfbetrieb in einem Zündungsbetrieb versetzt werden.It is proposed that the test volume flow be reduced to the ignition volume flow before the burner system is ignited. In particular, the test volume flow is reduced to ignite the burner system if the limit value is maintained by the pressure characteristic value during the presence of the test volume flow so that it corresponds to the flow value of the ignition volume flow. As a result, the burner system can advantageously be easily and / or quickly switched from a test operation to an ignition operation.

Unter einem "Brennersystem" soll in diesem Zusammenhang insbesondere ein System verstanden werden, welches dazu vorgesehen ist, Energie, insbesondere Bioenergie und/oder vorzugsweise fossile Energie, insbesondere durch einen Verbrennungsprozess, in Wärme umzuwandeln. Unter "vorgesehen" soll insbesondere speziell programmiert, ausgelegt und/oder ausgestattet verstanden werden. Darunter, dass ein Objekt zu einer bestimmten Funktion vorgesehen ist, soll insbesondere verstanden werden, dass das Objekt diese bestimmte Funktion in zumindest einem Anwendungs- und/oder Betriebszustand erfüllt und/oder ausführt. Insbesondere weist das Brennersystem, zumindest einen Brenner, zumindest ein Gebläse zur Zuführung einer Verbrennungsluft und zumindest ein Brennstoffregelventil zur Zuführung eines Brennstoffs auf. Der Brenner ist insbesondere dazu vorgesehen, ein Gemisch, insbesondere ein Brennstoffgemisch aus einer Verbrennungsluft und einem Brennstoff, zu verbrennen. Der Brenner kann insbesondere als ein leistungsmodulierender Gasgebläsebrenner ausgebildet sein.In this context, a “burner system” is to be understood in particular to mean a system which is intended to convert energy, in particular bioenergy and / or preferably fossil energy, into heat, in particular by means of a combustion process. “Provided” is to be understood in particular to be specially programmed, designed and / or equipped. The fact that an object is provided for a specific function should in particular be understood to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state. In particular, the burner system, at least one burner, has at least one blower for supplying combustion air and at least one fuel control valve for supplying a fuel. The burner is particularly intended to burn a mixture, in particular a fuel mixture of combustion air and a fuel. The burner can in particular be designed as a power-modulating gas fan burner.

Unter einem "Brennstoffgemisch" soll in diesem Zusammenhang insbesondere ein zündfähiges Gemisch aus einem Brennstoff und einer Verbrennungsluft verstanden werden, welches dazu vorgesehen ist, einem Brenner eines Brennersystems zur Durchführung eines Verbrennungsprozesses zugeführt zu werden. Unter einem "Brennstoff" soll in diesem Zusammenhang vorzugsweise ein kohlenwasserstoffhaltiges Gas oder Gasgemisch, vorzugsweise ein Naturgas oder ein Naturgasgemisch, insbesondere ein Erdgas, ein Flüssiggas oder ein Biogas, welches zumindest ein Alkan, insbesondere Methan, Ethan, Propan und/oder Butan, umfasst, verstanden werden. Unter einer "Abgasabführung" soll insbesondere eine Hohlleitung oder ein Hohlleitungssystem verstanden werden, welches dazu vorgesehen ist, ein Verbrennungsabgas aus einem Brennersystem, insbesondere aus einer Brennkammer eines Brennersystems, auszuleiten. Unter einem "Druckkennwert" soll in diesem Zusammenhang insbesondere ein Kennwert verstanden werden, welcher zumindest eine Information über einen Druck innerhalb der Abgasabführung des Brennersystems enthält. Der Druckkennwert wird mittels eines Druckschalters innerhalb der Abgasabführung erfasst. Anhand des Druckkennwerts wird auf eine Blockade der Abgasabführung geschlossen. Unter einer "Blockade der Abgasabführung" soll insbesondere verstanden werden, dass ein Gasstrom durch die Abgasabführung insbesondere durch Verschmutzung und/oder Fremdkörper derart gehemmt ist, dass Verbrennungsabgase nicht mehr in ausreichendem Maße abgeführt werden können.In this context, a “fuel mixture” is to be understood in particular as an ignitable mixture of a fuel and a combustion air which is intended to be fed to a burner of a burner system for carrying out a combustion process. In this context, a “fuel” is preferably a gas or gas mixture containing hydrocarbons, preferably a natural gas or a natural gas mixture, in particular a natural gas, a liquid gas or a biogas, which comprises at least one alkane, in particular methane, ethane, propane and / or butane , are understood. An "exhaust gas discharge" is to be understood in particular to mean a hollow line or a hollow line system which is provided for discharging a combustion exhaust gas from a burner system, in particular from a combustion chamber of a burner system. In this context, a “pressure characteristic value” is to be understood in particular as a characteristic value which contains at least information about a pressure within the exhaust gas discharge of the burner system. The pressure characteristic value is recorded by means of a pressure switch within the exhaust gas discharge. On the basis of the pressure characteristic, it is concluded that the exhaust gas discharge is blocked. A "blockage of the exhaust gas discharge" is to be understood in particular to mean that a gas flow through the exhaust gas discharge, in particular due to contamination and / or foreign bodies, is inhibited such that combustion exhaust gases can no longer be discharged to a sufficient extent.

Unter einem "Prüfvolumenstrom" soll in diesem Zusammenhang insbesondere ein Volumenstrom verstanden werden, welcher ausschließlich zur Detektion zu einer Blockade der Abgasabführung erzeugt wird. Insbesondere durchströmt der Prüfvolumenstrom das gesamte Brennersystem. Der Prüfvolumenstrom entspricht insbesondere zumindest im Wesentlichen einem insbesondere mittels eines Gebläses des Brennersystems maximal innerhalb des Brennersystems erzeugbaren Volumenstroms. Vorzugsweise ist der Prüfvolumenstrom ein insbesondere reiner Luftvolumenstrom. Insbesondere weist der Prüfvolumenstrom zumindest im Wesentlichen keine Beimengungen eines Brennstoffs auf.In this context, a “test volume flow” is to be understood in particular to mean a volume flow which is generated exclusively for detection to block the exhaust gas discharge. In particular, the test volume flow flows through the entire burner system. The test volume flow corresponds in particular at least essentially a volume flow that can be generated within the burner system, in particular by means of a fan of the burner system. The test volume flow is preferably a pure air volume flow. In particular, the test volume flow has at least essentially no admixtures of a fuel.

Unter einem "Zündvolumenstrom" soll in diesem Zusammenhang insbesondere ein Volumenstrom verstanden werden, welcher zu einer optimalen Zündung des Brennersystems, insbesondere zur Zündung eines Brenners des Brennersystems, benötigt wird. Der Zündvolumenstrom liegt insbesondere zwischen einem minimal innerhalb des Brennersystems erzeugbaren und einem maximal innerhalb des Brennersystems erzeugbaren Volumenstrom. Vorzugsweise ist der Zündvolumenstrom ein Luftvolumenstrom oder ein Brennstoff-Luft-Volumenstrom. Insbesondere ist der Zündvolumenstrom zu Beginn eines Zündungsvorgangs ein reiner Luftvolumenstrom, welchem im Verlauf des Zündungsvorgangs ein Brennstoff beigemischt wird.In this context, an “ignition volume flow” is to be understood in particular to mean a volume flow which is required for optimal ignition of the burner system, in particular for igniting a burner of the burner system. The ignition volume flow is in particular between a minimum volume flow that can be generated within the burner system and a maximum volume flow that can be generated within the burner system. The ignition volume flow is preferably an air volume flow or a fuel-air volume flow. In particular, the ignition volume flow at the start of an ignition process is a pure air volume flow, to which a fuel is added in the course of the ignition process.

Der Druckkennwert wird während eines Vorliegens des Prüfvolumenstroms erfasst und/oder ausgewertet, wodurch unmittelbar anhand des Druckkennwerts auf eine Blockade der Abgasabführung geschlossen werden kann. Insbesondere wird ein insbesondere durch eine Blockade hervorgerufene Störung einer Gasströmung innerhalb der Abgasabführung verursachtes Ansteigen des Druckkennwerts über einen insbesondere hinterlegten Sollwert erfasst und dahingehend auswertet, dass eine Blockade der Abgasabführung sicher festgestellt wird.The pressure characteristic value is recorded and / or evaluated during the presence of the test volume flow, whereby a blockage of the exhaust gas discharge can be inferred directly from the pressure characteristic value. In particular, a disturbance in a gas flow within the exhaust gas discharge caused in particular by a blockage is detected and an increase in the pressure characteristic value above a setpoint value, in particular, is recorded and evaluated in such a way that a blockage in the exhaust gas discharge is reliably determined.

Durch eine derartige Ausgestaltung kann ein verbessertes Verfahren zur Detektion einer Blockade einer Abgasabführung eines Brennersystems bereitgestellt werden. Insbesondere kann durch den zur Detektion einer Blockade erzeugten Prüfvolumenstrom, welcher größer ist als ein Zündvolumenstrom des Brennersystems eine vorteilhaft sichere und/oder zuverlässige Detektion von Blockaden erreicht werden. Insbesondere können auch vorteilhaft auch teilweise Blockaden detektiert werden, welche sonst lediglich bei einem Volllastbetrieb des Brennersystems detektierbar wären. Durch eine frühzeitige Erkennung von Blockaden der Abgasabführung kann ein vorteilhaft sicherer Betrieb eines Brennersystems erreicht werden.Such an embodiment can provide an improved method for detecting a blockage in an exhaust gas discharge of a burner system. In particular, the test volume flow generated for the detection of a blockage, which is larger than an ignition volume flow of the burner system, advantageously achieves safe and / or reliable detection of blockages. In particular, blockages can also advantageously be detected, which would otherwise only be detectable when the burner system is operating at full load. Advantageously safe operation of a burner system can be achieved by early detection of blockages in the exhaust gas discharge.

Ferner wird vorgeschlagen, dass der Prüfvolumenstrom nach Anforderung eines Brennerbetriebs des Brennersystems erzeugt wird. Der Prüfvolumenstrom wird insbesondere unmittelbar nach einer Anforderung eines Brennerbetriebs des Brennersystems erzeugt. Die Erzeugung des Prüfvolumenstroms ist insbesondere unabhängig von der angeforderten Brennerleistung. Hierdurch kann eine vorteilhaft frühzeitige Detektion einer Blockade der Abgasabführung erreicht werden.It is also proposed that the test volume flow be generated after a burner operation of the burner system is requested. The test volume flow is generated in particular immediately after a burner operation of the burner system has been requested. The generation of the test volume flow is in particular independent of the required burner output. In this way, an advantageous early detection of a blockage of the exhaust gas discharge can be achieved.

Zudem wird vorgeschlagen, dass der Prüfvolumenstrom vor einer Zündung des Brennersystems erzeugt wird. Insbesondere erfolgt eine Zündung des Brennersystems nach einer Auswertung des während des Vorliegens des Prüfvolumenstroms erfassten Druckkennwerts. Hierdurch können Blockaden der Abgasabführung vorteilhaft vor einer Zündung des Brennersystems detektiert werden.It is also proposed that the test volume flow is generated before the burner system is ignited. In particular, the burner system is ignited after an evaluation of the pressure characteristic value recorded during the presence of the test volume flow. In this way, blockages of the exhaust gas discharge can advantageously be detected before the burner system is ignited.

Des Weiteren wird vorgeschlagen, dass das Brennersystem bei einem Überschreiten eines Grenzwerts durch den Druckkennwert während eines Vorliegens des Prüfvolumenstroms außer Betrieb gesetzt wird. Darunter, dass das Brennersystem "außer Betrieb gesetzt wird" soll insbesondere verstanden werden, dass das Brennersystem insbesondere in einen Störungsmodus versetzt wird, in welchem insbesondere ein Einströmen von Brennstoff in das Brennersystem und ein Zünden des Brennersystems verhindert wird, und/oder vollständig ausgeschaltet wird. Insbesondere kann einem Betreiber und/oder Bediener des Brennersystems bei einem Überschreiten eines Grenzwerts durch den Druckkennwert eine Fehler- und/oder Warnmeldung ausgegeben werden, welche ihn auf das Vorliegen einer Blockade der Abgasabführung hinweist. Hierdurch kann ein vorteilhaft sicherer Betrieb des Brennersystems erreicht werden. Insbesondere kann eine Anreicherung einer Umgebungsluft mit Verbrennungsabgasen, insbesondere mit Kohlenmonoxid, welche aufgrund einer Blockade der Abgasabführung nicht mehr in ausreichendem Maße abgeführt werden können, vorteilhaft verhindert werden.Furthermore, it is proposed that the burner system be put out of operation when the pressure value exceeds a limit value while the test volume flow is present. The fact that the burner system is “put out of operation” is to be understood in particular to mean that the burner system is in particular put into a fault mode in which in particular the inflow of fuel into the burner system and ignition of the burner system is prevented and / or completely switched off , In particular, an operator and / or operator of the burner system can be given an error and / or warning message when the pressure value exceeds a limit value, which indicates that there is a blockage in the exhaust gas discharge. In this way, advantageously safe operation of the burner system can be achieved. In particular, an enrichment of an ambient air with combustion exhaust gases, in particular with carbon monoxide, which can no longer be sufficiently removed due to a blockage of the exhaust gas discharge, can advantageously be prevented.

Zudem wird eine Brennervorrichtung vorgeschlagen, mit einem Gebläse und einer Prüfeinheit zur Detektion einer Blockade einer Abgasabführung eines Brennersystems, wobei die Prüfeinheit zumindest einen Drucksensor aufweist, der dazu vorgesehen ist, zumindest einen Druckkennwert zu erfassen, wobei die Prüfeinheit dazu vorgesehen ist, zur Detektion der Blockade einen Prüfvolumenstrom zu erzeugen, welcher größer ist als ein Zündvolumenstrom des Brennersystems. Unter einer "Prüfeinheit" soll in diesem Zusammenhang insbesondere eine als Hardwareeinheit und/oder zumindest teilweise als Softwareeinheit ausgebildete Einheit verstanden werden, welche dazu vorgesehen ist, den Druckparameter insbesondere direkt, insbesondere mittels Sensoren und/oder Messfühlern, als Betriebsmesswert zu erfassen und auszuwerten. Insbesondere kann die Prüfeinheit zumindest teilweise einstückig mit einer Steuer- und/oder Regeleinheit des Brennersystems ausgebildet und/oder mit dieser verbunden sein. Unter einer "Steuer- und/oder Regeleinheit" soll insbesondere eine Einheit mit zumindest einer Steuerelektronik verstanden werden. Unter einer "Steuerelektronik" soll insbesondere eine Einheit mit einer Prozessoreinheit und mit einer Speichereinheit sowie mit einem in der Speichereinheit gespeicherten Betriebsprogramm verstanden werden. Der Drucksensor ist erfindungsgemäß als ein Druckschalter ausgebildet. Der Drucksensor ist dazu eingerichtet, den Druckkennwert innerhalb der Abgasabführung zu erfassen. Insbesondere ist die Prüfeinheit dazu vorgesehen, unmittelbar oder mittelbar, insbesondere über die Steuer und-/oder Regeleinheit, ein Gebläse des Brennersystems zur Erzeugung des Prüfvolumenstroms anzusteuern. Hierdurch kann ein Brennersystem mit verbesserten Betriebseigenschaften bereitgestellt werden. Insbesondere kann durch den zur Detektion einer Blockade erzeugte Prüfvolumenstrom, welcher größer ist als ein Zündvolumenstrom des Brennersystems eine vorteilhaft sichere und/oder zuverlässige Detektion von Blockaden erreicht werden. Insbesondere können auch vorteilhaft auch teilweise Blockaden detektiert werden, welche sonst lediglich bei einem Volllastbetrieb des Brennersystems detektierbar wären. Durch eine frühzeitige Erkennung von Blockaden der Abgasabführung kann ein vorteilhaft sicherer Betrieb eines Brennersystems erreicht werden.In addition, a burner device is proposed with a blower and a test unit for detecting a blockage of an exhaust gas discharge of a burner system, the test unit having at least one pressure sensor which is provided for detecting at least one pressure characteristic value, the test unit being intended for detecting the Blockade to generate a test volume flow that is greater than an ignition volume flow of the burner system. In this context, a “test unit” is to be understood in particular as a unit which is designed as a hardware unit and / or at least partially as a software unit and is intended to record and evaluate the pressure parameter in particular directly, in particular by means of sensors and / or sensors, as an operating measured value. In particular, the test unit can be at least partially integrally formed with and / or connected to a control and / or regulating unit of the burner system. A “control and / or regulating unit” is to be understood in particular as a unit with at least one control electronics. “Control electronics” is to be understood in particular to mean a unit with a processor unit and with a memory unit and with an operating program stored in the memory unit. According to the invention, the pressure sensor is designed as a pressure switch. The pressure sensor is set up to record the pressure characteristic value within the exhaust gas discharge. In particular, the test unit is intended to control a fan of the burner system directly or indirectly, in particular via the control and / or regulating unit, in order to generate the test volume flow. In this way, a burner system with improved operating properties can be provided. In particular, the test volume flow generated for the detection of a blockage, which is greater than an ignition volume flow of the burner system, advantageously achieves safe and / or reliable detection of blockages. In particular, blockages can also advantageously be detected, which would otherwise only be detectable when the burner system is operating at full load. Advantageously safe operation of a burner system can be achieved by early detection of blockages in the exhaust gas discharge.

Das erfindungsgemäße Verfahren ist in den Patentansprüchen 1-6 definiert. Es soll hierbei nicht auf die oben beschriebene Anwendung und Ausführungsform beschränkt sein. Insbesondere kann das erfindungsgemäße Verfahren zu einer Erfüllung einer hierin beschriebenen Funktionsweise eine von einer hierin genannten Anzahl von einzelnen Elementen, Bauteilen und Einheiten abweichende Anzahl aufweisen.The method according to the invention is defined in claims 1-6. It is not intended to be limited to the application and embodiment described above. In particular, the method according to the invention for fulfilling a function described here can have a number that differs from a number of individual elements, components and units mentioned here.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.

Es zeigen:

Fig. 1
eine schematische Darstellung eines Brennersystems mit einer Brennervorrichtung, die eine Prüfeinheit zur Detektion einer Blockade einer Abgasabführung des Brennersystems aufweist, und
Fig. 2
Ablaufdiagramm eines Verfahrens zur Detektion einer Blockade der Abgasabführung des Brennersystems.
Show it:
Fig. 1
a schematic representation of a burner system with a burner device having a test unit for detecting a blockage of an exhaust gas discharge of the burner system, and
Fig. 2
Flow diagram of a method for detecting a blockage of the exhaust gas discharge of the burner system.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Figur 1 zeigt ein als Gasbrennersystem ausgebildetes Brennersystem 10. Das Brennersystem 10 umfasst einen Brenner 24, ein Gebläse 14 sowie eine Abgasabführung 20. Dem Brennersystem 10 wird über eine Brennstoffzuleitung 26 ein gasförmiger Brennstoff 28, beispielsweise ein Erdgas, zugeführt. Über eine Verbrennungsluftzuleitung 30 wird dem Brennersystem 10 eine Verbrennungsluft 32 zugeführt. Der Brennstoff 28 und die Verbrennungsluft 32 werden zu einem zündfähigen Brennstoffgemisch 34 vermischt und dem Brenner 24 zugeführt. Die Zuführung des Brennstoffgemischs 34 erfolgt dabei mittels des dem Brenner 24 vorgeschalteten Gebläses 14. Die während des Verbrennungsprozesses im Brenner 24 entstehenden Verbrennungsabgase 36 werden über die Abgasabführung 20 abgeführt. Das Brennersystem 10 weist ein Ventil 38 auf, welches in der Brennstoffzuleitung 26 angeordnet ist. Das Ventil 38 ist vorzugsweise als ein elektronisches Regelventil ausgebildet. Das Ventil 38 ist dazu vorgesehen, einen Brennstoffvolumenstrom 40 zu regeln. Figure 1 shows a burner system 10 designed as a gas burner system. The burner system 10 comprises a burner 24, a blower 14 and an exhaust gas discharge 20. A gaseous fuel 28, for example a natural gas, is fed to the burner system 10 via a fuel feed line 26. Combustion air 32 is fed to the burner system 10 via a combustion air supply line 30. The fuel 28 and the combustion air 32 are mixed to form an ignitable fuel mixture 34 and fed to the burner 24. The fuel mixture 34 is supplied by means of the blower 14 connected upstream of the burner 24. The combustion exhaust gases 36 which arise in the burner 24 during the combustion process are discharged via the exhaust gas discharge 20. The burner system 10 has a valve 38 which is arranged in the fuel feed line 26. The valve 38 is preferably designed as an electronic control valve. The valve 38 is provided to regulate a fuel volume flow 40.

Ferner weist das Brennersystem 10 eine Brennervorrichtung 16 mit einer Prüfeinheit 18 zur Detektion einer Blockade 12 einer Abgasabführung 20 auf. Die Prüfeinheit 18 kann insbesondere zumindest teilweise einstückig mit einer hier nicht dargestellten Steuer- und/oder Regeleinheit des Brennersystems 10 ausgebildet sein und/oder mit dieser verbunden sein. Die Prüfeinheit 18 weist einen Drucksensor 22 auf, der dazu vorgesehen ist, zumindest einen Druckkennwert innerhalb der Abgasabführung 20 zu erfassen. Der Drucksensor 22 kann insbesondere als ein Absolutdrucksensor, ein Differenzdrucksensor und/oder vorzugsweise als ein Druckschalter ausgebildet sein. Die Prüfeinheit 18 ist dazu vorgesehen, zur Detektion der Blockade 12 einen Prüfvolumenstrom zu erzeugen, welcher größer ist als ein Zündvolumenstrom des Brennersystems 10. Die Prüfeinheit 18 ist dazu vorgesehen, zur Erzeugung des Prüfvolumenstroms das Gebläse 14 anzusteuern. Das Gebläse 14 des Brennersystems 10 wird zur Erzeugung des Prüfvolumenstroms temporär mit einer Drehzahl betrieben, welche oberhalb einer Drehzahl zur Erzeugung des Zündvolumenstroms liegt. Die Prüfeinheit 18 ist dazu vorgesehen, den Druckkennwert während eines Vorliegens des Prüfvolumenstroms mittels des Drucksensors 22 zu erfassen und auszuwerten. Anhand des Druckkennwerts kann unmittelbar auf eine Blockade 12 der Abgasabführung 20 geschlossen werden. Insbesondere wird durch die Prüfeinheit 18 ein durch eine Blockade 12 hervorgerufene Störung einer Gasströmung innerhalb der Abgasabführung 20 verursachtes Ansteigen des Druckkennwerts über einen in der Prüfeinheit 18 hinterlegten Sollwert erfasst und dahingehend auswertet, dass eine Blockade 12 der Abgasabführung 20 sicher festgestellt werden kann.Furthermore, the burner system 10 has a burner device 16 with a test unit 18 for detecting a blockage 12 of an exhaust gas discharge 20. The test unit 18 can in particular be formed at least partially in one piece with a control and / or regulating unit (not shown here) of the burner system 10 and / or be connected to it. The test unit 18 has a pressure sensor 22 which is provided to detect at least one pressure characteristic value within the exhaust gas discharge 20. The pressure sensor 22 can in particular be designed as an absolute pressure sensor, a differential pressure sensor and / or preferably as a pressure switch. The test unit 18 is provided to generate a test volume flow for the detection of the blockage 12, which is larger than an ignition volume flow of the burner system 10. The test unit 18 is provided to control the blower 14 to generate the test volume flow. The fan 14 of the burner system 10 is temporarily operated to generate the test volume flow at a speed which is above a speed to generate the ignition volume flow. The test unit 18 is provided to detect and evaluate the characteristic pressure value during the presence of the test volume flow by means of the pressure sensor 22. On the basis of the pressure characteristic value, a blockage 12 of the exhaust gas discharge can be made directly 20 to be closed. In particular, the test unit 18 detects a disturbance of a gas flow within the exhaust gas discharge 20 caused by a blockage 12, and increases the pressure characteristic value above a setpoint value stored in the test unit 18 and evaluates it so that a blockage 12 of the exhaust gas discharge pipe 20 can be reliably determined.

Figur 2 zeigt ein Ablaufdiagramm eines Verfahrens zur Detektion einer Blockade 12 der Abgasabführung 20 des Brennersystems 10, bei welchem der Drucckennwert zur Detektion der Blockade 12 erfasst und/oder ausgewertet wird. Zur Detektion der Blockade 12 wird in einem Verfahrensschritt 42 der Prüfvolumenstrom erzeugt. Der Prüfvolumenstrom ist größer ist als der Zündvolumenstrom des Brennersystems 10. Der Prüfvolumenstrom wird unmittelbar nach Anforderung 44 eines Brennerbetriebs des Brennersystems 10 und vor einer Zündung des Brennersystems 10 erzeugt. Hierzu wird das Gebläse 14 des Brennersystems 10 zur Erzeugung des Prüfvolumenstroms temporär mit einer Drehzahl betrieben, welche oberhalb einer Drehzahl zur Erzeugung des Zündvolumenstroms liegt. Während der Erzeugung des Prüfvolumenstroms ist das Ventil 38 geschlossen. Der Prüfvolumenstrom ist ein reiner Luftvolumenstrom. In einem weiteren Verfahrensschritt 46 wird der Druckkennwert während Vorliegens des Prüfvolumenstroms erfasst und ausgewertet. Das Brennersystem 10 wird bei einem Überschreiten eines Grenzwerts durch den Druckkennwert während eines Vorliegens des Prüfvolumenstroms in einem weiteren Verfahrensschritt 48 außer Betrieb gesetzt. Wurde der Grenzwert nicht überschritten, wird in einem weiteren Verfahrensschritt 50 der Prüfvolumenstrom vor einer Zündung des Brennersystems 10 auf den Zündvolumenstrom reduziert. Während der Reduzierung des Prüfvolumenstroms auf den Zündvolumenstrom ist das Ventil 38 geschlossen. Der auf diese Weise eingestellte Zündvolumenstrom ist zunächst ein reiner Luftvolumenstrom. Nach Einstellung des Zündvolumenstroms wird in einem weiteren Verfahrensschritt 54 das Ventil 38 geöffnet und der Brenner 24 gezündet. Nach Öffnung des Ventils 38 ist der Zündvolumenstrom ein zur Zündung des Brenners 24 benötigter Brennstoff-Luft-Volumenstrom. Nach der Zündung des Brenners 24 geht das Brennersystem 10 in einen normalen Brennerbetrieb 52 über. Figure 2 shows a flowchart of a method for detecting a blockage 12 of the exhaust gas discharge 20 of the burner system 10, in which the pressure value for detecting the blockage 12 is detected and / or evaluated. To detect the blockage 12, the test volume flow is generated in a method step 42. The test volume flow is greater than the ignition volume flow of the burner system 10. The test volume flow is generated immediately after request 44 of burner operation of the burner system 10 and before the burner system 10 is ignited. For this purpose, the fan 14 of the burner system 10 for generating the test volume flow is temporarily operated at a speed which is above a speed for generating the ignition volume flow. The valve 38 is closed during the generation of the test volume flow. The test volume flow is a pure air volume flow. In a further method step 46, the pressure characteristic value is recorded and evaluated while the test volume flow is present. The burner system 10 is deactivated in a further method step 48 if the pressure characteristic value exceeds a limit value while the test volume flow is present. If the limit value has not been exceeded, the test volume flow is reduced to the ignition volume flow in a further method step 50 before ignition of the burner system 10. Valve 38 is closed while the test volume flow is reduced to the ignition volume flow. The ignition volume flow set in this way is initially a pure air volume flow. After the ignition volume flow has been set, the valve 38 is opened in a further method step 54 and the burner 24 is ignited. After opening the valve 38, the ignition volume flow is a fuel-air volume flow required to ignite the burner 24. After the burner 24 has been ignited, the burner system 10 changes to a normal burner operation 52.

Claims (8)

  1. Method for the detection of a blockage (12) of a flue gas evacuation means (20) of a burner system (10), in the case of which method at least one pressure characteristic value for the detection of the blockage (12) is detected and/or evaluated, a test volumetric flow being produced for the detection of the blockage (12), which test volumetric flow is greater than an ignition volumetric flow of the burner system (10), a fan (14) of the burner system (10) for the production of the test volumetric flow being operated temporarily at a rotational speed which lies above a rotational speed for the production of the ignition volumetric flow, characterized in that the pressure characteristic value is detected by means of a pressure switch within the flue gas evacuation means (20), and the test volumetric flow is reduced before an ignition of the burner system (10) to the ignition volumetric flow.
  2. Method according to Claim 1, characterized in that the test volumetric flow is produced after a request (44) for burner operation (52) of the burner system (10).
  3. Method according to Claim 1 or 2, characterized in that the test volumetric flow is produced before an ignition of the burner system (10).
  4. Method according to one of the preceding claims, characterized in that the burner system (10) is disabled if a limit value is exceeded by way of the pressure characteristic value during the presence of the test volumetric flow.
  5. Method according to one of the preceding claims, characterized in that the test volumetric flow is an air volumetric flow.
  6. Method according to one of the preceding claims, characterized in that the ignition volumetric flow is an air volumetric flow or an air volumetric flow, to which a fuel volumetric flow is added.
  7. Burner apparatus having a fan and a test unit (18) for the detection of a blockage (12) of a flue gas evacuation means (20) of a burner system (10), the test unit (18) being provided for carrying out a method according to one of the preceding claims and having at least one pressure sensor (22) which is provided to detect at least one pressure characteristic value, characterized in that the test unit (18) is provided to produce a test volumetric flow for the detection of the blockage (12), which test volumetric flow is greater than an ignition volumetric flow of the burner system (10), and in that the pressure sensor is configured as a pressure switch within the flue gas evacuation means.
  8. Burner system having at least one burner apparatus (16) according to Claim 7.
EP16175599.6A 2016-06-22 2016-06-22 Method for detecting a blockade of a flue gas discharge of a burner system and burner system Active EP3260777B1 (en)

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DE102020110475A1 (en) * 2020-04-17 2021-10-21 Vaillant Gmbh Method for recognizing an existing or impending blockage of at least one flow path
DE102021109473A1 (en) * 2021-04-15 2022-11-03 Vaillant Gmbh Procedure for testing an exhaust system of a heater

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US6234164B1 (en) * 1999-02-19 2001-05-22 Rinnai Kabushiki Kaisha Intake and discharge tube closure detector for combustion device of forced intake and discharge type

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GB2105888A (en) * 1981-09-15 1983-03-30 Worcester Engineering Company Detecting flue blockage
JP3667871B2 (en) * 1996-05-09 2005-07-06 株式会社ガスター Combustion equipment and method for determining the life of combustion equipment
CA2544994A1 (en) * 2006-04-27 2007-10-27 Fabricant De Poeles International Inc. Flue obstruction detector for oil-fired space heaters
ITPD20120030A1 (en) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co METHOD FOR THE CONTROL OF A BURNER OF A BOILER AND CONTROL SYSTEM OPERATING IN ACCORDANCE WITH THIS METHOD

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US6234164B1 (en) * 1999-02-19 2001-05-22 Rinnai Kabushiki Kaisha Intake and discharge tube closure detector for combustion device of forced intake and discharge type

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