EP0881431A2 - Brûleur pour la mise en oeuvre d'une unité pour la génération d'un gaz chaud - Google Patents

Brûleur pour la mise en oeuvre d'une unité pour la génération d'un gaz chaud Download PDF

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Publication number
EP0881431A2
EP0881431A2 EP98810339A EP98810339A EP0881431A2 EP 0881431 A2 EP0881431 A2 EP 0881431A2 EP 98810339 A EP98810339 A EP 98810339A EP 98810339 A EP98810339 A EP 98810339A EP 0881431 A2 EP0881431 A2 EP 0881431A2
Authority
EP
European Patent Office
Prior art keywords
burner
burner according
inflow
air inlet
flow
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Withdrawn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
EP98810339A
Other languages
German (de)
English (en)
Other versions
EP0881431A3 (fr
Inventor
Jürgen Dr. Haumann
Hans Peter Knöpfel
Christian Dr. Paschereit
Wolfgang Dr. Polifke
Thomas Prof. Dr. Sattelmayer
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.)
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Publication of EP0881431A2 publication Critical patent/EP0881431A2/fr
Publication of EP0881431A3 publication Critical patent/EP0881431A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • 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
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/02—Baffles or deflectors for air or combustion products; Flame shields in air inlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07002—Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/09002—Specific devices inducing or forcing flue gas recirculation

Definitions

  • the present invention relates to a burner for operating an assembly for Generation of a hot gas according to the preamble of claim 1.
  • the invention seeks to remedy this.
  • the invention as set out in the claims is characterized, the task is based on a burner at the beginning to submit proposals that address the above imperfections and to remedy shortcomings.
  • the main advantage of the invention is that the main body of the burner remains essentially unchanged.
  • the inner walls of those forming the burner Shells built-in guide bodies, which take over the task, in advance the combustion air flowing purely tangentially into the interior of the burner, which preferably consists of an air / exhaust gas mixture, in the axial direction redirect.
  • the inflow angle of this guide body which preferably are designed as guide vanes, seen from the burner tip in the direction of flow. In the area of the burner outlet, these guide bodies have up to a vertical position with respect to the burner axis. So that these Guides can work properly, their number will be within the length of the Brenners chosen so that the ratio between the distance of the guide body to each other and the width of the tangential inflow channel into the interior of the Brenners is approximately 1.
  • Fig. 1 shows a premix burner in perspective.
  • Fig. 2 possibly Fig. 3 are used.
  • the the first-mentioned figures have mainly the purpose, the type and the functioning of such a burner.
  • the premix burner according to FIG. 1 consists of two hollow conical partial bodies 1, 2, which are nested offset from one another. That burner is operated with a gaseous and / or liquid fuel.
  • cone-shaped here is not only that shown by a fixed opening angle understood cone shape understood, but it also closes other configurations of the partial body, such as a diffuser or diffuser-like Shape, as well as a confuser or confuser-like shape. These forms are not specifically shown here, since they are familiar to the person skilled in the art are.
  • the offset of the respective central axis or longitudinal axis of symmetry Partial body 1, 2 to each other see Fig. 2, Pos.
  • each one tangential air inlet duct 5, 6 free through which the combustion air 7 in the interior of the premix burner, i.e. in the cone cavity 8 flows.
  • the two conical partial bodies 1, 2 each have one cylindrical initial part 9, 10, which also, analogous to the aforementioned partial bodies 1, 2, offset from each other, so that the tangential air inlet channels 5, 6 are present over the entire length of the premix burner.
  • a nozzle 11 for preferential atomization a liquid fuel 12 housed such that their injection approximately with the narrowest cross section of that formed by the partial bodies 1, 2 Cone cavity 8 coincides.
  • the injection capacity and the operating mode this nozzle 11 depends on the given parameters of the respective Premix burner.
  • the fuel 12 injected through the nozzle 11 can if necessary, be enriched with a recirculated exhaust gas; then it is also possible, through the nozzle 11, the complementary injection of an amount of water to accomplish.
  • the premix burner can be purely conical, i.e. without a cylindrical one Initial parts 9, 10 may be formed.
  • the sub-bodies 1, 2 also each have one Fuel line 13, 14, which runs along the tangential inlet channels 5, 6 are arranged and provided with injection openings 15, through which preferably a gaseous fuel 16 in the combustion air flowing there 7 is injected, as is symbolized by arrows 16, wherein this injection also the fuel injection level (see FIG. 2, item 22) of the Systems forms.
  • These fuel lines 13, 14 are preferably at the latest placed at the end of the tangential inflow, before entering the cone cavity 8, this to ensure an optimal air / fuel mixture.
  • the premix burner On the combustion chamber side, the premix burner has an anchorage for the partial bodies 1, 2 serving front panel 18 with a number of holes 19 through which if necessary, a mixed or cooling air 20 the front part of the combustion chamber 17th or whose wall is fed.
  • the premix burner is used solely by means of a liquid Operated fuel 12, this is done via the central nozzle 11, wherein this fuel 12 then enters the cone cavity 8 at an acute angle or is injected into the combustion chamber 17.
  • the nozzle 11 thus forms a tapered fuel profile 23 rotating from the tangentially flowing Combustion air 7 is enclosed. In the axial direction, the concentration of the injected fuel 12 continuously through the incoming combustion air 7 broken down into an optimal mixture.
  • a backflow zone 24 (vortex breakdown) also forms there with one opposite the flame front 25 acting there stabilizing effect, in which Meaning that the backflow zone 24 functions as a disembodied flame holder takes over.
  • the optimal fuel concentration across the cross section is only in the area the vortex runout, that is, in the area of the backflow zone 24. First a stable flame front 25 then arises at this point.
  • the design of the premix burner is suitable furthermore excellent, the flow opening of the tangential air inlet ducts 5, 6 to change as required, which means without changing the overall length of the premix burner a relatively large operational bandwidth can be covered.
  • the partial bodies 1, 2 are also in a different plane to one another displaceable, which even overlaps the above the air inlet plane into the cone cavity 8 (see FIG. 2, item 21) in the same Area of the tangential air inlet ducts 5, 6, as can be seen from FIG. 2, can be accomplished. It is then also possible to pass through the partial bodies 1, 2 to interleave a counter-rotating movement in a spiral.
  • the premix burner is not open the number shown is limited. A larger number is displayed there, for example, when it comes to making the premixing wider, or the Swirl number and thus the dependent formation of the backflow zone 24 by to influence a larger number of air inlet ducts accordingly.
  • Premix burners of the type described here are also those for which Achieving a swirl flow from a cylindrical or quasi-cylindrical It is assumed that the combustion air flows into the interior of the pipe Pipe via tangentially arranged air inlet ducts, and inside the tube a conical body with decreasing in the direction of flow Cross-section is arranged, which also with this configuration critical swirl number can be achieved at the outlet of the burner.
  • FIG. 2 shows the same premix burner according to FIG. 1, but from a different one Perspective and in a simplified representation.
  • This Fig. 2 is essentially serve to correctly record the configuration of this premix burner.
  • This offset is a measure of the size of the flow width resp. the flow cross section of the tangential air inlet ducts 5, 6.
  • the respective central axes 3, 4 run parallel to one another here.
  • Fig. 3 is a section approximately in the middle of the premix burner.
  • the mirror image Tangentially arranged feed channels 27, 28 each perform the function of a Mixing section in which the combustion air 7, which consists of fresh air 29 and recirculated flue gas 30 is formed, is perfected.
  • the combustion air 7 is processed in an injector system 200. Upstream of each feed channel 27, 28, as a tangential inflow into the interior 8 of the premix burner serves, the fresh air 29 over the entire length of this premix burner evenly distributed over perforated plates 31, 32. In the direction of flow to the tangential Inlet channels 5, 6, these perforated plates 31, 32 are perforated.
  • the perforations perform the function of individual injector nozzles 31a, 32a, which have a suction effect exercise against the surrounding flue gas 30 such that each of these Injector nozzle 31a, 32a only sucks in a certain proportion of flue gas 30, whereupon over the entire axial length of the perforated plates 31, 32, that of the burner length corresponds, a uniform flue gas admixture takes place.
  • This Configuration means that the two media, ie the Fresh air 29 and the flue gas 30, an intimate mixing takes place, so that the flow length extending up to the tangential air inlet ducts 5, 6 of the feed channels 27, 28 can be minimized for the mixture formation can.
  • the local injector configuration 200 is characterized by that the geometry of the premix burner, especially what the shape and the Concerns the size of the tangential air inlet ducts 5, 6, remains dimensionally stable, i.e. by along the evenly metered distribution of the hot smoke gases 30 along The entire axial length of the premix burner does not result in any heat-related Faults.
  • the same injector configuration as the one just described here can also in the area of the head-side fuel nozzle 11 for a axial supply of combustion air can be provided.
  • the feed channels 27, 28 also have guide plates 50, which are described in the description of FIGS Fig. 4 is discussed in more detail.
  • FIG. 4 is a schematic illustration of the premix burner in the direction of flow, in particular expressing the course of the perforated plates 31, 32 belonging to the injector system in relation to the inflow planes 33 of the feed channels 27, 28.
  • This course is parallel, the inflow planes 33 also running parallel to the burner axis 26 of the premix burner over the entire burner length.
  • This figure also shows how the injector nozzles 31a, 32a are mounted. There are two possibilities here of guiding the injector nozzles 31a, 32a. On the one hand, the upper illustration shows a completely vertical course of the injector nozzles 32a.
  • the lower illustration shows a different course of the injector nozzles 31a: Here they have an inflow angle which changes continuously in the direction of flow with respect to the burner axis 26. From an initially acute angle in the area of the head stage of the premix burner, this gradually increases until the injector nozzles 31a in the area of the burner end are then approximately perpendicular to the burner axis 26.
  • Which design variant is used depends on the specific operating parameters and other auxiliary measures. Mixed forms of vertical and oblique injection are also possible.
  • the partial bodies 1, 2 are equipped with guide vanes 50.
  • the inflow angle a ie the angle of the corresponding guide vane with respect to the burner axis 26, increases from the burner head to the burner outlet, the angularity of these guide vanes 50, of course, being dependent on the respective inflow plane of the injector nozzles 31a, 32a.
  • the last-acting guide vane is essentially almost perpendicular to the burner axis 26.
  • the angle increases with vertically acting injector nozzles 31a from initially approximately 40 ° to an angle ⁇ n of approximately 80 °.
EP98810339A 1997-05-26 1998-04-20 Brûleur pour la mise en oeuvre d'une unité pour la génération d'un gaz chaud Withdrawn EP0881431A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19721936 1997-05-26
DE1997121936 DE19721936A1 (de) 1997-05-26 1997-05-26 Brenner zum Betrieb eines Aggregates zur Erzeugung eines Heissgases

Publications (2)

Publication Number Publication Date
EP0881431A2 true EP0881431A2 (fr) 1998-12-02
EP0881431A3 EP0881431A3 (fr) 1999-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810339A Withdrawn EP0881431A3 (fr) 1997-05-26 1998-04-20 Brûleur pour la mise en oeuvre d'une unité pour la génération d'un gaz chaud

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EP (1) EP0881431A3 (fr)
DE (1) DE19721936A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8029273B2 (en) * 2004-03-31 2011-10-04 Alstom Technology Ltd Burner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004015904A1 (de) * 2004-03-31 2005-10-20 Alstom Technology Ltd Baden Verfahren zur Flüssigbrennstoffzerstäubung in einem Vormischbrenner sowie Vormischbrenner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321809A1 (fr) 1987-12-21 1989-06-28 BBC Brown Boveri AG Procédé pour la combustion de combustible liquide dans un brûleur

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722216A (en) * 1971-01-04 1973-03-27 Gen Electric Annular slot combustor
DE3666625D1 (en) * 1985-02-21 1989-11-30 Tauranca Ltd Fluid fuel fired burner
DE3819899C1 (en) * 1988-06-11 1989-11-30 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De Apparatus for generating a homogeneous mixture from a first and second medium
CH680157A5 (fr) * 1989-12-01 1992-06-30 Asea Brown Boveri
EP0548396B1 (fr) * 1991-12-23 1995-02-22 Asea Brown Boveri Ag Dispositif servant à mélanger deux composants gazeux et brûleur dans lequel ce dispositif est appliqué
GB2272756B (en) * 1992-11-24 1995-05-31 Rolls Royce Plc Fuel injection apparatus
DE4309115A1 (de) * 1993-03-23 1994-09-29 Viessmann Werke Kg Verfahren zum Betrieb eines Ölverdampfungsbrenners
DE4320212A1 (de) * 1993-06-18 1994-12-22 Abb Research Ltd Feuerungsanlage
US5394688A (en) * 1993-10-27 1995-03-07 Westinghouse Electric Corporation Gas turbine combustor swirl vane arrangement
DE19537636B4 (de) * 1995-10-10 2004-02-12 Alstom Kraftwerksanlage
DE19545036A1 (de) * 1995-12-02 1997-06-05 Abb Research Ltd Vormischbrenner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321809A1 (fr) 1987-12-21 1989-06-28 BBC Brown Boveri AG Procédé pour la combustion de combustible liquide dans un brûleur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8029273B2 (en) * 2004-03-31 2011-10-04 Alstom Technology Ltd Burner

Also Published As

Publication number Publication date
EP0881431A3 (fr) 1999-06-30
DE19721936A1 (de) 1998-12-03

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