Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
  • F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/002—Wall structures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
  • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
  • F23M20/005—Noise absorbing means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
  • F23R2900/00014—Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators

Definitions

• Combustion chamber for a gas turbine system The invention relates to a combustor for a gas turbine plant according to the preamble of claim 1 and an ent ⁇ speaking formed gas turbine plant according to claim. 6
• Gas turbine plants essentially consist of a compressor, a combustion chamber with burner and an expansion turbine. Intake air is compressed in the compressor before it is mixed with fuel in the combustion chamber, which is arranged downstream of the burner and arranged in the compressor plenum, and this mixture is burned.
• the expansion turbine connected downstream of the combustion chamber then extracts thermal energy from the combustion exhaust gases produced in the burner and converts them into mechanical energy.
• a with for drinks ⁇ cycle turbine couplable generator may convert this mechanical power to generate electricity in electrical energy.
• thermoacoustically induced vibrations deploy.
• thermoacoustic oscillations in the combustion chamber pose a problem in the design and especially in the operation of gas turbine plants.
• Helmholtz resonators consisting of at least one resonator tube and one resonator volume are used today for damping purposes.
• Helmholtz resonators attenuate the amplitude of oscillations with the Helmholtz frequency as a function of the cross-sectional area and length of the resonator tube and of the resonator volume in certain frequency ranges.
• Helmholtz resonators as damping devices for limiting thermoacoustic oscillations in combustion chambers are known, for example, from EP 1 605 209 A1 or US Pat
• FIG 1 shows, for example, from US 2007/0125089 AI ⁇ be known array of Helmholtz resonators 20 on a ring of the combustion chamber 10 transverse to the flow direction.
• the combustion chamber wall 10 is tubular and separates the combustion chamber 1 from the surrounding compressor plenum 2.
• the openings 22 in the combustion chamber wall 10 between the resonator volume 21 and the combustion chamber 1 form the resonator tubes of the Helmholtz resonators.
• Each Helmholtz resonator can - as shown in FIG 1 - have a plurality of resonator tubes or even a single Resonatorröhe.
• ⁇ comes with it at any entry of the hot combustion gases from the combustion chamber 1 into the Helmholtz resonators 20, additional openings for the supply of barrier air are provided.
• these are arranged to ⁇ -openings 23 on the resonator tubes 22 opposite wall of the resonator 21st
• These openings 23 make it possible for compressed air S to flow from the compressor plenum 2 surrounding the combustion chamber into the resonator volume 21 and from there via the resonator tubes 22 into the combustion chamber 1, thereby blocking the penetration of hot combustion gases into the resonator tubes 22.
• the object of the invention is to provide a combustion chamber admirherstel ⁇ len, which overcomes the disadvantages described above. This object is achieved with the combustion chamber having the features of claim 1.
• the resonator tubes become increasingly longer, which results in ever better convection cooling of the combustion chamber wall.
• gas turbine plants can thus have the lowest possible pollutant emissions at maximum efficiency in all load ranges.
• the invention is not restricted to the fact that the inclination of the resonator tubes takes place exclusively in the flow direction of the combustion exhaust gases. Rather, without further limitation of the present invention, embodiments are conceivable in which the resonator tubes have an inclination relative to the surface normal of the combustion chamber inner wall, which inclination is composed both of an inclination component in the flow direction and an inclination component transverse thereto. So The resonator tubes can be optimally adapted to the local conditions of the internal combustion chamber flow.
• the inventive concept for injecting sealing air S into the combustion chamber of the combustion chamber 1 of a gas turbine plant will be described below by way of example with reference to a torch based on a tubular combustion chamber in which the damping device 20 is essentially adapted on the outside of the combustion chamber wall 10.
• the invention is equally suitable for use in burners in which the damping device 20 is fully integrated in the burner chamber wall 10, or in any other embodiment in which a supply of sealing air S via the damping device 20.
• FIG. 2 shows a partial section of a combustion chamber 1 along the flow direction of the combustion gases G, with egg ⁇ ner purge air, in which, in contrast to the prior art, the sealing air S at an angle greater than zero degrees (here about 45 degrees) relative to the surface normal N the
• the damping properties of the Helmholtz resonators can differ from those of the Helmholtz resonators with vertical injection known from the prior art by the oblique arrangement of the resonator tubes with otherwise the same resonator volume and kept constant number of resonator tubes, is usually an adaptation of the Dämpfungseigen- create the resonator parameters required. This can e.g. by changing the number of resonator tubes 22 'and / or the feed openings 23 and / or their diameter or by changing the resonator volume 21. In the event that an association with several Helmholtz
• Resonators consisting of resonators with different Helmholtz frequencies and thus different damping characteristics is used, it is advisable to form subsets with Helmholtz resonators of different types. Shown in FIG. 3 is the case that Helmholtz resonators of different types are arranged at different axial positions of the combustion chamber. The variant shown here aims lichst a portion of the seal air S mög ⁇ upstream, that is to inject release towards the zone of heat (resonator type 1) and a portion of the seal air S downstream possible to inject (resonator type 2).
• the Helmholtz resonators of the type 1 arranged on a first ring around the tubular combustion chamber have resonator tubes 22 '' whose axis A is inclined at an angle in the direction upstream of the surface normal N of the combustion chamber inner wall, and the Helmholtz resonators arranged in a second ring.
• Resonators of type 2 have resonator tubes 22 'whose axes A are inclined at an angle in direction direction downstream of the surface normal N are inclined.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (4)

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• 2012
  • 2012-08-14 CN CN201280042586.7A patent/CN103765107B/zh not_active Expired - Fee Related
  • 2012-08-14 US US14/240,549 patent/US20140345282A1/en not_active Abandoned
  • 2012-08-14 EP EP12748204.0A patent/EP2732215A2/de not_active Withdrawn
  • 2012-08-14 WO PCT/EP2012/065856 patent/WO2013029984A2/de active Application Filing

Non-Patent Citations (1)

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