EP2236933A1 - Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur - Google Patents

Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur Download PDF

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Publication number
EP2236933A1
EP2236933A1 EP09155348A EP09155348A EP2236933A1 EP 2236933 A1 EP2236933 A1 EP 2236933A1 EP 09155348 A EP09155348 A EP 09155348A EP 09155348 A EP09155348 A EP 09155348A EP 2236933 A1 EP2236933 A1 EP 2236933A1
Authority
EP
European Patent Office
Prior art keywords
burner
hub
fuel
supply channel
fuel supply
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Withdrawn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
EP09155348A
Other languages
German (de)
English (en)
Inventor
Andreas Böttcher
Tobias Krieger
Ulrich Wörz
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP09155348A priority Critical patent/EP2236933A1/fr
Priority to AT09764490T priority patent/ATE527496T1/de
Priority to EP09764490A priority patent/EP2271876B1/fr
Priority to PCT/EP2009/065983 priority patent/WO2010105707A1/fr
Publication of EP2236933A1 publication Critical patent/EP2236933A1/fr
Withdrawn legal-status Critical Current

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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
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/283—Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00018—Means for protecting parts of the burner, e.g. ceramic lining outside of the flame tube

Definitions

  • the invention relates to a burner assembly for fluid fuels and a method of manufacturing a burner assembly.
  • Gas turbine engines are used in power plants and other large-scale engine applications, among other things, with burner assemblies for firing fluid fuels.
  • burner assemblies for firing fluid fuels.
  • so-called dual-fuel burners are used, which are provided for the combustion of liquid and gaseous fuels, for example natural gas and fuel oil, optionally or in combination.
  • the burner assemblies are accordingly large in size and have a complex structure with multiple fuel supply channels.
  • a centrally located small sized pilot burner with its own fuel supply and air supply is used to stabilize the flame of a large main burner which is placed around the pilot burner.
  • the large main burner is operated predominantly in lean-mixed operation with excess oxygen, thereby achieving more favorable emission values.
  • operation with a lean mixture causes the flame of the main burner at least in certain operating conditions subject to fluctuations, which are compensated by a continuous firing action of the pilot burner.
  • Such a burner arrangement is for example in EP 0 580 683 B1 played.
  • a challenge in these burners are the resulting by an uneven thermal distribution mechanical stresses in the walls of the metallic housing, the so-called hub in which the Zubigringkanäle the gas and oil fuels are arranged relatively close together, represents a gas ring space feeds the main burner based upstream of the so-called swirl vanes, which impart a mixing swirl to the air stream with the fuel gas, or through the swirl vanes, on the upstream side of the flow direction of the incoming air.
  • an oil supply is present, which is usually located closer to the burner outlet, as the gas supply. It comprises an oil annulus and a leading to the annulus oil supply channel, which is located in the located between the gas annulus and the pilot burner hub wall.
  • gas Since gas has a lower density compared to oil, it requires a larger cross-section, whereby the dimensioning of the gas supply is much greater than the oil supply. Therefore, the part of the burner hub with the gas supply to a larger air duct facing outer surface than the oil supply.
  • the air supply is done with pre-compressed air that has passed through a compressor, whereby this supplied air due to the compression has a temperature that already reaches over 400 ° C. Consequently, the area of the burner hub with the gas supply is heated rapidly to a temperature in the range of over 400 ° C and remains at this operating temperature.
  • the leading to the oil annulus oil supply channel is further away from the hot air supply channel so that the oil in the oil supply channel hardly undergoes heating and therefore only has a temperature of about 50 ° C.
  • the burner hub experiences strong heating in the area of the gas ring space and, on the other hand, the adjacent oil supply channel is significantly cooler, the wall between the gas ring space and the oil supply channel is subject to a large temperature gradient.
  • the temperature gradient arise thermal stresses that shorten the life of such burner hubs or make the use of a high-quality material with the associated costs required.
  • a cold fuel is led through a hot hub area, such voltages occur.
  • the present invention therefore has the object to reduce the described thermal stresses in the burner hub of the burner assembly.
  • a burner arrangement according to the invention for a combustion system for firing fluid fuels comprises a burner hub, an air supply system surrounding the burner hub and at least one fuel supply channel with fuel outlet openings leading in the direction of the air supply system.
  • the at least one fuel supply channel is at least partially formed in the burner hub, so that the material of the burner hub forms a wall of the fuel supply channel.
  • Disposed in at least one fuel supply passageway is a shielding wall spaced from the wall of the fuel supply passageway so that a gap not belonging to the flow path of the fuel flowing through the fuel supply passageway is formed between the wall of the fuel supply passageway and the shielding wall.
  • the gap forms a poorly heat-conducting region in comparison to the surrounding metal of the burner hub, which thermally insulates the metal of the hub from the flowing fuel and thus limits the heat exchange between the fuel and the burner hub. Due to the reduced heat exchange, the thermally induced stresses decrease in comparison to burner arrangements without shielding wall.
  • the shielding wall can be designed, in particular, as a hollow body introduced into the fuel feed channel and adapted to the inner contour of the fuel feed channel.
  • the adaptation to the inner contour of the fuel supply channel makes it possible to ensure a uniform space between the wall of the fuel supply channel and the shield.
  • the fuel supply channel may comprise, in particular, a distribution channel leading to the fuel outlet openings and a substantially annular distribution channel and a substantially tubular supply channel leading to the distribution channel.
  • the hollow body for example, is designed as a sleeve or as a hollow torus.
  • the hollow body is preferably formed at least partially of metal or ceramic.
  • the hollow body can in principle be formed in one piece or in several parts.
  • a formed of metal hollow body may, for example, at least partially as a bent sheet metal part or at least partially as a machined metal part, such as a rotating part, be formed.
  • the hollow body may be provided with outlet projections which are inserted into the respective fuel outlet openings of the fuel supply channel, so that penetration of fuel into the intermediate space at the transition between the distributor channel and the fuel outlet openings can be avoided.
  • the hollow body may be provided with at least one inlet port which is inserted into an inlet opening of the fuel supply channel to prevent penetration of fuel into the gap at the transition between the supply channel and the distribution channel.
  • the projections may also serve as positioning means which hold the hollow body in the fuel channel in the correct position.
  • the fuel supply channel comprises a disposed in the wall of the burner hub, to the Fuel outlet openings leading and at least partially annular fuel distribution channel. This is formed from two with the open sides opposite each other arranged grooves.
  • the burner hub comprises at least a first and a second hub part, which are joined together. A parting plane between the first and the second hub part extends through the fuel distributor passage of the respective fuel supply passage such that one of the grooves forming the fuel distributor passage is present in each hub part before the two hub parts are assembled, and the hollow body can be positioned in one of the grooves.
  • the first and the second hub part and possibly further hub parts of the burner hub may be connected to one another by force, form or material, for example by welding, soldering, screwing or riveting.
  • the method according to the invention makes it possible to produce a burner hub with a shielding wall in an annular fuel distributor channel, wherein the shielding wall is designed as a hollow body introduced into the fuel distributor channel.
  • the method can in particular also be applied to a burner hub with more than two hub parts.
  • a further hollow body in which a part of a fuel supply channel forming groove in installed another hub part of the burner hub. The hub parts are joined together and created a force, positive or cohesive connection between the assembled hub parts of the burner hub.
  • FIG. 1 shows a burner assembly according to the prior art, which may optionally be used in conjunction with a plurality of similar arrangements, for example in the combustion chamber of a gas turbine plant.
  • the pilot burner system comprises a central oil feed 1 (medium G) with an oil nozzle 5 arranged at its end and an inner gas supply channel 2 (medium F) arranged concentrically around the central oil feed 1. This in turn is surrounded by a concentrically arranged around the axis of the burner inner air supply channel 3 (Medium E).
  • a suitable ignition system may be arranged, for which many possible embodiments are known and its representation has therefore been omitted here.
  • the inner air supply channel 3 has a swirl blading 6 in its end region.
  • the pilot burner system can operate in a manner known per se, i. H. predominantly as a diffusion burner operated. Its task is to maintain the main burner in a stable burning operation, since it is usually operated with a lean mixture to reduce the emission of pollutants, which requires stabilizing its flame by means of a diffusion flame or based on a less lean mixture flame.
  • the main burner system has a concentric with the pilot burner system arranged and obliquely on this incoming outer air supply annular duct system 4.
  • This air supply annular channel system 4 is also provided with a swirl blading 7.
  • the swirl blading 7 consists of hollow blades with outlet nozzles 11 in the flow cross-section of the air supply annular channel system 4 (medium A). These are fed from a gas feed channel 19 and a gas ring channel 9 through openings 10.
  • the burner has an oil feed channel 23, which opens into an oil ring channel 13, which in turn has outlet nozzles 14 in the region or downstream of the swirl blading 7.
  • FIG. 2 shows an embodiment of the burner hub 18 of a burner assembly according to the prior art in cross section.
  • a gas annulus 9 and an oil annulus 13 are arranged.
  • the annular spaces 9 and 13 each have a plurality of outlet openings 10 and 14, through which the respective fuel (medium B or medium C in FIG. 1 ) can escape.
  • FIG. 3 is a schematically exaggerated sequence of thermally induced stresses in the burner hub of the prior art FIG. 2 shown. Due to the stresses, the wall 21 between the gas annulus 9 and the oil supply passage 23 is deformed. This deformation of the metallic burner hub 18 is due to the temperature gradient in the wall between the oil feed channel 23, flows through the oil at a temperature of about 50 ° C, and the gas annulus 9, due to the heating by the compressor air in the air supply channel 4th (Medium A in Fig.1 ) is heated to about 420 ° C.
  • FIG. 4 shows a detail of a cross section through an embodiment of the burner assembly according to the invention.
  • the burner assembly comprises a burner hub 18, in which a gas annulus 9 with a gas supply channel 19 (in FIG. 4 not shown) and an oil annulus 13 are arranged with an oil supply passage 23.
  • the basic structure of the burner assembly corresponds to that with reference to the FIGS. 1 and 2 described structure. It will therefore only the differences to the FIGS. 1 and 2 described burner structure described.
  • a shielding wall 30 is arranged in the oil supply duct 23 such that a gap 38 is formed between the wall 21 between the gas ring space 9 and the oil supply duct 23 on the one hand and the shield wall 30 on the other hand.
  • This space 38 isolates the one formed by the inner surface of the shield 30 Flow path of the oil thermally from the wall 21 between the gas annulus 9 and the oil supply passage 23, since the medium in the gap, such as air or hardly or hardly flowing oil, has a much lower thermal conductivity than the metal of the burner hub 18th
  • the thermal conductivity of air is 0.023 W / mK and that of oil is about 0.15 W / mK (at room temperature).
  • the gap 38 can therefore be considered as an adiabatic thermal shield.
  • the amount of the distance s between the wall 21 and the shielding wall 30 may be used constructively to set a desired heat transfer rate.
  • the shielding wall is realized in the form of a sleeve 30 inserted into the oil supply duct 23, which prevents direct contact of the cold oil flowing along the flow path in the oil supply duct 23 with the wall 21 between the gas annular space 9 and the oil supply duct 23.
  • the outer diameter of the sleeve 30 is dimensioned smaller by a predetermined amount than the inner diameter of the oil feed channel 23, so that between the inserted sleeve 30 and the wall 21, a gap 38 is formed, in which a medium having a substantially lower thermal conductivity than the metal Burner hub 18 is located.
  • the oil itself can be used in the simplest case, provided that no ignition is to be feared, since in this case no sealing of the intermediate space 38 against the flow path of the oil is required.
  • the sleeve 30 In order to easily mount the sleeve 30 in the oil supply passage 23 of the burner hub 18, it is designed as a insertable into an opening in a tubular section 37 of the oil supply passage 23 sleeve 30.
  • the sleeve 30 has for this purpose at its upstream end a preferably circular, annular positioning projection 33 which serves as a spacer for radially centering the sleeve body in the oil supply passage 23 and at the same time carries the function of a abutting edge, against a complementary, in the region of the opening the tubular projection 37 abuts existing abutment edge of a corresponding Nutausfräsung and thus determines the position of the sleeve 30 in the axial direction.
  • the present embodiment has a further positioning projection 35, which is arranged in the vicinity of the downstream end of the sleeve 30.
  • a further positioning projection 35 is arranged in the vicinity of the downstream end of the sleeve 30.
  • positioning projection 35 is preferably designed as an annular nikum Surpriseder projection and extends with its preferably cylindrically configured outer diameter up to the wall of the cavity 38 so that it also contributes to the centering of the sleeve 30.
  • FIG. 5 shows a second embodiment of the burner hub 18 according to the invention with a arranged in the gas annulus 9 shielding, which is formed by a hollow body 40 inserted into the gas annulus 9.
  • this is modeled on the ring shape of the annular space 9 and thereby formed itself toroidal.
  • FIG. 6 is a perspective view of the toroidal Hol stressess 40 shown.
  • the outer dimensions of the toroidal hollow body 40 are selected with respect to the inner dimensions of the gas ring space 9 such that an adiabatically acting gap 48 is formed between the outer side of the hollow body 40 and the inner surface of the gas annulus 9, with which the incoming fuel gas from the walls of the gas annulus. 9 is thermally isolated.
  • the toroidal hollow body 40 has a plurality of circumferentially arranged outlet ports 42. As in FIG. 5 can be seen, they are introduced into the fuel outlet openings 10 of the gas annulus 9 so that their outer surfaces abut the inner surfaces of the openings 10.
  • the toroidal hollow body 40 has at least one inlet connection 43 which can be introduced into the gas supply duct 19 leading to the gas annular space 9 such that its outer surface rests against the inner surfaces of the gas supply duct 19.
  • These ports 42 and 43 at the same time perform the function of spacers, through which between the walls of the gas annulus 9 and the outer surfaces of the sheath device 40 is set a predetermined distance and maintained during operation.
  • the gas flowing through is prevented from direct heat exchange with the surrounding areas of the burner hub 18.
  • the fuel gas may have a lower temperature than the burner hub 18 heated to about 420 ° C by the pre-compressed air.
  • the gas due to the thermal insulation the walls of the annular space 9 does not cool directly.
  • the burner hub 18 can achieve a more uniform heating, so that no or only significantly lower thermally induced voltages occur.
  • the recessed adiabatically acting gap 48 if no ignition is to be feared, be filled in the simplest case with the gas, which can avoid sealing problems.
  • Fuel gases have low thermal conductivity compared to the metal of the burner hub, whereby the heat transfer from the hub wall to the gas is significantly reduced.
  • the holharmome 40 is preferably designed as a thin-walled, bent sheet metal component.
  • two bent to half-shells sheet metal parts can be assembled and welded or pressed.
  • the holody may also be formed as a casting, but the wall thickness caused by casting would be detrimental and would require an increase in the dimensions of the burner hub 18.
  • FIG. 5 is also the arranged in the oil supply passage 23 sleeve 30 visible, which projects into the oil annulus 13.
  • a shielding wall in the form of a toroidal hollow body corresponding to the holanalysis 40 may be arranged in the gas annulus 9 in the oil annulus 13, so that the heat transfer between the walls of the oil annulus 13 and the oil can also be reduced.
  • This donut-shaped hollow body, not shown, can then be connected to the end of the sleeve 30.
  • the burner hub 18 is preferably formed separated into at least two hub parts 1801 and 1802 such that the separation plane XX separates the gas ring space 9 substantially symmetrically and circularly and makes it accessible.
  • the gas annulus 9 is then formed essentially of two in the abutment surfaces of the hub parts 1801 and 1802 opposing grooves.
  • the toroidal hollow body 40 can be inserted into the groove of one of the two hub parts 1801 and 1802 and fixed there before the two hub parts 1801 and 1802 are joined together.
  • the joining of the hub parts 1801 and 1802 can thereafter force, form or cohesive, preferably by welding, riveting or screwing done.
  • the burner hub 18 can have a further division along the separating surface Y-Y for this purpose.
  • the burner hub 18 in this case comprises a third hub part 1803, which is separated from the previously arranged hub part 1802 by the dividing plane Y-Y, which separates the oil annulus 13 substantially symmetrical and circular.
  • the oil annulus 13 is then also formed essentially of two in the abutting surfaces of the hub parts 1802 and 1803 opposite each other grooves.
  • the installation of the toroidal hollow body can be done by the toroidal hollow body 1802 and 1803 inserted before the joining of the two hub parts in the groove of one of the two hub parts 1802 and 1804 and fixed there.
  • the sheath device 40 can also be fastened to the inlet connection 43 on the end of the sleeve 30 projecting into the oil annulus.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
EP09155348A 2009-03-17 2009-03-17 Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur Withdrawn EP2236933A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP09155348A EP2236933A1 (fr) 2009-03-17 2009-03-17 Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur
AT09764490T ATE527496T1 (de) 2009-03-17 2009-11-27 Brenneranordnung für fluidische brennstoffe und verfahren zum herstellen einer brenneranordnung
EP09764490A EP2271876B1 (fr) 2009-03-17 2009-11-27 Dispositif de brûleur pour combustibles fluides et procédé de fabrication du dispositif de brûleur
PCT/EP2009/065983 WO2010105707A1 (fr) 2009-03-17 2009-11-27 Dispositif de brûleur pour combustibles fluides et procédé de fabrication du dispositif de brûleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09155348A EP2236933A1 (fr) 2009-03-17 2009-03-17 Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur

Publications (1)

Publication Number Publication Date
EP2236933A1 true EP2236933A1 (fr) 2010-10-06

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ID=40957759

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09155348A Withdrawn EP2236933A1 (fr) 2009-03-17 2009-03-17 Agencement de brûleur pour combustibles liquides et procédé de fabrication d'un agencement de brûleur
EP09764490A Not-in-force EP2271876B1 (fr) 2009-03-17 2009-11-27 Dispositif de brûleur pour combustibles fluides et procédé de fabrication du dispositif de brûleur

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP09764490A Not-in-force EP2271876B1 (fr) 2009-03-17 2009-11-27 Dispositif de brûleur pour combustibles fluides et procédé de fabrication du dispositif de brûleur

Country Status (3)

Country Link
EP (2) EP2236933A1 (fr)
AT (1) ATE527496T1 (fr)
WO (1) WO2010105707A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014114535A1 (fr) * 2013-01-25 2014-07-31 Siemens Aktiengesellschaft Brûleur muni d'un système central d'alimentation en combustible
EP2851619A1 (fr) * 2013-09-20 2015-03-25 Mitsubishi Hitachi Power Systems, Ltd. Chambre de combustion de turbine à gaz à double alimentation
EP3198199A1 (fr) * 2014-09-25 2017-08-02 Dürr Systems AG Tête de brûleur et turbine à gaz pourvue d'un tel brûleur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580683B1 (fr) 1991-04-25 1995-11-08 Siemens Aktiengesellschaft Bruleur, en particulier pour turbines a gaz, pour la combustion peu polluante du gaz de houille et d'autres combustibles
WO2001001041A1 (fr) * 1999-06-24 2001-01-04 Pratt & Whitney Canada Corp. Bouclier thermique pour injecteur de carburant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580683B1 (fr) 1991-04-25 1995-11-08 Siemens Aktiengesellschaft Bruleur, en particulier pour turbines a gaz, pour la combustion peu polluante du gaz de houille et d'autres combustibles
WO2001001041A1 (fr) * 1999-06-24 2001-01-04 Pratt & Whitney Canada Corp. Bouclier thermique pour injecteur de carburant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014114535A1 (fr) * 2013-01-25 2014-07-31 Siemens Aktiengesellschaft Brûleur muni d'un système central d'alimentation en combustible
EP2851619A1 (fr) * 2013-09-20 2015-03-25 Mitsubishi Hitachi Power Systems, Ltd. Chambre de combustion de turbine à gaz à double alimentation
US10094567B2 (en) 2013-09-20 2018-10-09 Mitsubishi Hitachi Power Systems, Ltd. Dual-fuel injector with a double pipe sleeve gaseus fuel flow path
EP3198199A1 (fr) * 2014-09-25 2017-08-02 Dürr Systems AG Tête de brûleur et turbine à gaz pourvue d'un tel brûleur

Also Published As

Publication number Publication date
ATE527496T1 (de) 2011-10-15
WO2010105707A1 (fr) 2010-09-23
EP2271876A1 (fr) 2011-01-12
EP2271876B1 (fr) 2011-10-05

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