EP2369162A2 - Verfahren und Vorrichtung zur Abdichtung einer Brennkammer eines Verbrennungssystems sowie ein Verbrennungssystem - Google Patents

Verfahren und Vorrichtung zur Abdichtung einer Brennkammer eines Verbrennungssystems sowie ein Verbrennungssystem Download PDF

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Publication number
EP2369162A2
EP2369162A2 EP11159177A EP11159177A EP2369162A2 EP 2369162 A2 EP2369162 A2 EP 2369162A2 EP 11159177 A EP11159177 A EP 11159177A EP 11159177 A EP11159177 A EP 11159177A EP 2369162 A2 EP2369162 A2 EP 2369162A2
Authority
EP
European Patent Office
Prior art keywords
combustion
combustion chamber
sealing
chamber
environment
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Withdrawn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
EP11159177A
Other languages
English (en)
French (fr)
Other versions
EP2369162A3 (de
Inventor
Tom Collins
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 EP2369162A2 publication Critical patent/EP2369162A2/de
Publication of EP2369162A3 publication Critical patent/EP2369162A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/0535—Seals or sealing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/055—Heaters or coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2253/00—Seals

Definitions

  • the invention relates to a method for sealing a combustion chamber of a heat engine with external combustion comprising a Stirling engine, with respect to an environment, in particular for sealing a combustion chamber between a premixing burner, the Stirling engine and the environment.
  • the invention relates to an apparatus for sealing a combustion chamber of a heat engine with external combustion comprising a Stirling engine, with respect to an environment, in particular for sealing a combustion chamber between a premixing burner, the Stirling engine and the environment.
  • the invention further relates to a combustion system comprising a heat engine with external combustion such as a Stirling engine with a combustion chamber which is sealed with respect to an environment, in particular a combustion system with a sealed combustion chamber between a premixing burner, the Stirling engine and the environment.
  • a heat engine with external combustion such as a Stirling engine with a combustion chamber which is sealed with respect to an environment, in particular a combustion system with a sealed combustion chamber between a premixing burner, the Stirling engine and the environment.
  • a method for sealing a combustion chamber of a heat engine with external combustion comprising a Stirling engine, with respect to an environment, in particular for sealing a combustion chamber between a premixing burner, the Stirling engine and the environment, characterised in that an overpressure with respect to a combustion chamber pressure is generated in a sealing zone.
  • a second aspect of the present invention provides an apparatus for sealing a combustion chamber of a heat engine with external combustion comprising a Stirling engine, with respect to an environment, in particular for sealing a combustion chamber between a premixing burner, the Stirling engine and the environment, characterised in that at a transition to be sealed from the combustion chamber to the environment, at least two sealing elements, which are spaced apart from one another and disposed one behind the other to form an intermediate chamber, are provided wherein the intermediate chamber is connected fluidically to a cold medium supply.
  • a third aspect of the present invention provides a combustion system comprising a heat engine with external combustion such as a Stirling engine with a combustion chamber which is sealed with respect to an environment, in particular a combustion system with a sealed combustion chamber between a premixing burner, the Stirling engine and the environment, characterised in that at least one apparatus according to the second aspect of the invention is provided for sealing.
  • a heat engine with external combustion such as a Stirling engine with a combustion chamber which is sealed with respect to an environment, in particular a combustion system with a sealed combustion chamber between a premixing burner, the Stirling engine and the environment, characterised in that at least one apparatus according to the second aspect of the invention is provided for sealing.
  • the overpressure in the sealing zone is produced by an air supply from a combustion air fan or a gas-air mixer.
  • cold air exposed to overpressure is passed from the sealing zone into the combustion chamber and/or into the surroundings to provide a cooling flow through the seal.
  • the at least two sealing elements may be arranged and joined in a single sealing device.
  • This sealing device locates with the engine or burner at two distinct locations, which are spaced apart from one another and disposed one behind the other to form an intermediate chamber.
  • the intermediate chamber is connected fluidically to a cold medium supply.
  • the intermediate chamber has a higher pressure than the combustion chamber by means of a pressure unit so that an overpressure prevails in the intermediate chamber.
  • the sealing element assigned to the combustion chamber of the at least two sealing elements has at least one through opening for fluidic communication of the combustion chamber to the intermediate chamber.
  • the intermediate chamber of the apparatus is fluidically connected to the pressure side of a gas air mixture of a fuel supply of the combustion system.
  • the intermediate chamber of the apparatus is fluidically connected to the pressure side (outlet) of the fan.
  • Yet another embodiment of the present invention provides that the gas-air mixer or fan is fluidically connected to the intermediate chamber for providing an overpressure in the intermediate chamber compared with the combustion chamber by means of at least one line.
  • the fan is fluidically connected to the intermediate chamber of the apparatus.
  • FIG. 1 For purposes of this case it is provided that the intermediate chamber of the apparatus is fluidically connected to some point in the system (depending on the specific arrangement) which has a higher pressure than the combustion chamber.
  • the figures shows schematically as a block diagram a section of the combustion system 10 with the apparatus 1 according to the invention.
  • the combustion system 10 comprises a Stirling engine 5, a combustion chamber 2 and an external environment 3.
  • the combustion chamber 2 adjoins the Stirling engine 5.
  • Both the combustion chamber 2 and the Stirling engine 5 are surrounded by the environment 3.
  • a transition 6 is formed which needs to be sealed.
  • the combustion system is operated such that a fuel, for example, a gas G and air L, via an air supply, are passed as fuel-air mixtures via a fuel supply 12 into the combustion chamber 2.
  • air L and gas G are mixed in a gas-air mixer 12 before entering into the combustion chamber 2.
  • an adjusting element 15 for example, a controllable gas valve, is provided in the fuel supply 12. From the gas valve the gas G is passed via corresponding line 16 into the gas-air mixer 12a.
  • the line 16a is the reference pressure communication line (small hose) from the gas mixer air inlet to the gas valve.
  • the air L is passed via the air supply into the gas-air mixer 12a, for example, by means of a fan 17.
  • the gas-air mixer 12a has a Venturi unit 11 through which the gas G and the air L flow.
  • the Venturi unit 11 produces a region 13 having a lower pressure.
  • the pressure is in this case dependent, inter alia, on the speed and the mass flow rate of the air flowing through the Venturi unit 11.
  • the adjusting element 15 uses the pressure difference between incoming air pressure or the ambient air pressure and the lower pressure in the region produced by the Venturi unit 11 to regulate the gas supply. In this way, the mixture of air L and gas G is regulated by means of the pressure difference.
  • the resulting gas-air mixture is then passed into the combustion chamber 2 and burnt by means of a flame or a plurality of flames.
  • the heat thereby produced is passed via thermal radiation or thermal convection to the corresponding part of the Stirling engine 5.
  • the Venturi unit 11 and the pre-mixing burner 4 have a pressure loss compared with the inflowing air L which is associated with the gas volume flow through the Venturi unit 11 or the pre-mixing burner 4. In this way, the gas-air mixture in the combustion chamber 2 always has a lower static pressure during operation than the air entering the Venturi unit 11.
  • At least two sealing elements 8 which are spaced apart from one another, and disposed one behind the other to form an intermediate chamber 7 are provided at the transition 6 to be sealed from the combustion chamber 2 to the environment 3.
  • the intermediate chamber 7 is fluidically connected to a cold medium supply 14.
  • the cold medium supply 14 can be connected to any pressure unit 9 which provides a higher pressure than is present in the combustion chamber 2.
  • the cold medium supply passes some of the cold air supplied to the Venturi unit 11 via a corresponding line into the intermediate chamber 7.
  • the line is configured as a hose or the like. In this way, the intermediate chamber 7 has a higher static pressure than the environment 3 and the combustion chamber 2.
  • the cold air flows from the leak either into the combustion chamber 2 or into the environment 3.
  • the associated pressure drop in the intermediate chamber 7 is smaller than the pressure loss due to the Venturi unit 11 and in the combustion chamber 2, at least as long as the leakage opening does not exceed a certain range.
  • the pressure in the intermediate chamber 7 is always higher than in the combustion chamber 2.
  • the other sealing element 8 can, for example, be formed as a baffle.
  • lines can be formed in the sealing elements 8 and/or around the sealing elements 8 through which the cold air can flow for cooling the sealing elements 8.
  • a constant flow of air can be provided through the intermediate chamber to the surroundings via an opening with an associated pressure drop in order to provide cooling to the seal at all times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP11159177.2A 2010-03-24 2011-03-22 Verfahren und Vorrichtung zur Abdichtung einer Brennkammer eines Verbrennungssystems sowie ein Verbrennungssystem Withdrawn EP2369162A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1004937A GB2478949A (en) 2010-03-24 2010-03-24 Over-pressure seal between Stirling engine and combustion chamber

Publications (2)

Publication Number Publication Date
EP2369162A2 true EP2369162A2 (de) 2011-09-28
EP2369162A3 EP2369162A3 (de) 2014-12-10

Family

ID=42228261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11159177.2A Withdrawn EP2369162A3 (de) 2010-03-24 2011-03-22 Verfahren und Vorrichtung zur Abdichtung einer Brennkammer eines Verbrennungssystems sowie ein Verbrennungssystem

Country Status (2)

Country Link
EP (1) EP2369162A3 (de)
GB (1) GB2478949A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2869411A1 (de) * 2013-08-29 2015-05-06 Via Mechanics, Ltd. Gaslaserresonator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6179851A (ja) * 1984-09-28 1986-04-23 Aisin Seiki Co Ltd スタ−リング機関用燃焼器
GB0210929D0 (en) * 2002-05-13 2002-06-19 Bg Intellectual Pty Ltd A stirling engine assembly
US6848441B2 (en) * 2002-07-19 2005-02-01 Hon Technology Inc. Apparatus and method for cooling a surface of a fireplace
GB0301718D0 (en) * 2003-01-24 2003-02-26 Microgen Energy Ltd A stirling engine assembly
GB0310999D0 (en) * 2003-05-13 2003-06-18 Microgen Energy Ltd A domestic combined heat and power assembly
GB0512672D0 (en) * 2005-06-21 2005-07-27 Microgen Energy Ltd A stirling engine assembly and methods of assembling such an assembly
JP2007120495A (ja) * 2005-09-30 2007-05-17 Kenji Okayasu スターリングエンジン装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2869411A1 (de) * 2013-08-29 2015-05-06 Via Mechanics, Ltd. Gaslaserresonator

Also Published As

Publication number Publication date
GB2478949A (en) 2011-09-28
GB201004937D0 (en) 2010-05-12
EP2369162A3 (de) 2014-12-10

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