EP1070914B1 - Brûleur à prémélange - Google Patents

Brûleur à prémélange Download PDF

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Publication number
EP1070914B1
EP1070914B1 EP99114376A EP99114376A EP1070914B1 EP 1070914 B1 EP1070914 B1 EP 1070914B1 EP 99114376 A EP99114376 A EP 99114376A EP 99114376 A EP99114376 A EP 99114376A EP 1070914 B1 EP1070914 B1 EP 1070914B1
Authority
EP
European Patent Office
Prior art keywords
swirl generator
premix burner
burner according
premix
carrier structure
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.)
Expired - Lifetime
Application number
EP99114376A
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German (de)
English (en)
Other versions
EP1070914A1 (fr
Inventor
Bettina Dr. Paikert
Richard Strässle
Christian Dr. Steinbach
Dieter Winkler
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.)
General Electric Technology GmbH
Original Assignee
Alstom Schweiz 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 Alstom Schweiz AG filed Critical Alstom Schweiz AG
Priority to DE59907942T priority Critical patent/DE59907942D1/de
Priority to EP99114376A priority patent/EP1070914B1/fr
Priority to US09/624,258 priority patent/US6331109B1/en
Publication of EP1070914A1 publication Critical patent/EP1070914A1/fr
Application granted granted Critical
Publication of EP1070914B1 publication Critical patent/EP1070914B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F23R3/34—Feeding into different combustion zones
    • F23R3/343—Pilot flames, i.e. fuel nozzles or injectors using only a very small proportion of the total fuel to insure continuous combustion
    • 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
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
    • 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
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • 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
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
    • F23R3/60—Support structures; Attaching or mounting means
    • 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
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling

Definitions

  • the invention relates to premix burners according to the preamble of independent claim.
  • each Premix burner for operation with gaseous and / or liquid fuels become known who have essential features in common. So closes each a swirl generator with tangential air inlet openings a cavity a whose cross-sectional area widens in the axial flow direction.
  • this is realized by the swirl generator is conical, while the completely equivalent in WO 93/17279 proposed solution that is, the swirl generator itself cylindrical build, and inside the cavity a conical, extending in axial Use flow tapering displacement body. Fuel is supplied to the swirl flow within the swirl generator.
  • Burners of the type known from EP 0 321 809 have been in use for years practical application in gas turbines and atmospheric Firing systems proven. That from EP 0 321 809 and from EP 0 780 629 well-known burners have been continuously developed, and Suggestions for improvement can be found in a large number of published Documents.
  • Such a burner has a front panel on which the swirl generator and, if applicable, a Mixing tube are installed.
  • the front plate marks the end of the Brenners to the combustion chamber, and it separates a room from which air passes the tangential openings flow into the interior of the burner, from the combustion chamber.
  • the entire burner must be in one way be anchored to the combustion chamber wall. Therefore, the known today Burner of the swirl generator or - if available, a mixing tube - firmly with connected to the front panel, for example welded onto this.
  • Operational hot combustion gases are now applied to the front panel, while the rest of the structure from a medium with significantly lower Temperature is surrounded.
  • the swirl generator or the mixing tube prevent the front panel from free thermal expansion, and straight on the connection point, which is often a weld seam for manufacturing reasons high mechanical stresses are induced.
  • the invention seeks to remedy this.
  • the invention as in the Is characterized, the task is based on one To build premix burner of the type mentioned in such a way that Relative shifts of the individual components of the burner due to thermal expansion can take place unhindered. Furthermore, the Ensure cooling of hot gas-exposed parts, or poorly Coolable parts must be protected against excessive thermal loads.
  • the essence of the invention is therefore to design the front panel as a support structure which support structure the swirl generator or, if applicable, a Swirl generator downstream mixing tube is attached.
  • a heat protection shield is located downstream of the support structure arranged, which is connected to the support structure that in the limits of the expected thermal expansions the free mutual Slidability of the support structure and heat shield is only slightly impaired.
  • a possibly required cooling of the support structure and the Heat protection shield can be combined in a practical way.
  • the support structure is provided with a plurality of openings through which a Cooling medium, generally preferably air, flows out to the combustion chamber.
  • a Cooling medium generally preferably air
  • the support structure serves as a perforated plate for impingement cooling of the heat shield while the coolant flowing through it at the same time Absorbs heat from the support structure.
  • the space between the Carrier structure and the heat shield is then designed as a cooling channel which for Avoidance of radial flows, which is advantageous due to a circumferential web is divided.
  • the support structure in turn can, if the structural conditions so allow to be connected directly to the combustion chamber wall. Should that Temperature distributions in the combustion chamber walls do not do this or only with Allow disadvantages, the support structure is preferred by a number of the support structure of upstream oriented pipes or rods on the Combustion chamber wall held. This also makes the recording thermal expansion guaranteed. These tubes are in axial Flow direction passed through the heat shield, so they can be Fuel gas supply used for a so-called pilot operation of the burner become. In this operating state, the fuel-air mixture is the Brenner too lean for stable premix combustion. Gaseous Fuel is then not only added to the swirl flow and premixed, but the fuel is also in the combustion chamber through said pipes introduced and burned in a diffusion flame. Here arise much larger amounts of nitrogen oxides than in premix combustion, however, the diffusion flame is much more stable than one at high air numbers Premixed.
  • Preferred swirl generator geometries result in connection with the invention itself from the subclaims.
  • the invention can be implemented at the same time Premix burners with or without the swirl generator downstream Mixing section.
  • a first preferred embodiment of an inventive Premix burner can be found in Fig. 1. It is essentially around the premix burner known from EP 0 321 809, whose Swirl generator made of nested conical half-bodies 101, 102 consists. The burner is shown partially cut. The partial body 101, 102 enclose a cavity 14, the cross section of which is axial Extended direction of the burner to the combustion chamber 22. A gaseous one Oxidation medium - generally air or another oxygen-containing Gas - 15 flows through tangential slots 19 which extend in the axial direction of the Insert the burner into this cavity. A forms in the cavity 14 Swirl flow out.
  • the swirl flow within the Cavity 14 admixed at least one fuel.
  • the partial bodies 101, 102 of the swirl generator have openings 31 Mistake. Tubes 32 are passed through these openings.
  • Fig. 2 the same burner is shown without a section. For the better The liquid fuel supply is not shown for clarity. In Fig. 2 can be clearly seen how a hammer supply pipe 32 from the outside through the Opening 31 of the swirl generator body 101 is passed.
  • the external bracket of the gas supply pipe 32 without attachment to the Components of the swirl generator, has when using the burner appropriate thermodynamic conditions significant advantages.
  • the Combustion air 15 reaches temperatures of several 100 ° C. 500 ° C from today's perspective, more on the conservative side, while in connection with higher pressure ratios of the working processes of gas turbines and external ones Combustion air preheating temperatures around 700 ° C can be discussed.
  • a possible preheating temperature of the gaseous fuels is up for example 150 ° C or 200 ° C limited.
  • the swirl generator partial bodies thus have and the gas supply pipes 32 are very different in operation Temperatures and thermal expansions. If a gas supply is now firmly connected to a swirl generator part, in the Operation strong due to disabled thermal expansion Thermal stresses that are at least the life of the burner shorten.
  • the invention can of course also be implemented if the Gas supply lines for premix operation in a different way, for example in the conventional type known from EP 0 321 809 executed and firmly connected to the swirl generator.
  • EP 0 908 671 discloses another variant of the fuel gas supply, that of here used strongly resembles. However, the gas supply lines are also there firmly connected to the swirl generator. This does not contradict per se Idea of the invention, and does not stand in the way of realizing the invention. in the However, in spirit of the invention, it is advantageous and consistent, indeed at this point by mechanical decoupling of the swirl generator from to avoid thermal stresses in the gas supply.
  • This variant of the premix gas supply was used as an exemplary embodiment chosen, but this is not a limitation! It would also be possible a burner according to the invention without any gas supply, only for the Operation with liquid fuel. He receives such variants Expert from the teaching of the present document, however, completely casual, which is why they are not explicated.
  • FIG. 1 as in FIG. 2 it can be seen that the combustion chamber 22 facing Front part of the burner is constructed in two parts.
  • the swirl generator is on a support structure 42 held, while a heat shield 41 without direct large-area contact with the support structure 42 before this protects direct contact with hot gas within the combustion chamber 22.
  • the support structure in turn is provided with a number of bores 11, through which a cooling medium 18, preferably the oxidation medium, into one formed as a cooling channel space between the support structure and the heat shield flows.
  • the support structure thus also serves as Perforated plate for the impingement cooling of the heat shield, and is by itself the coolant 18 flowing through is cooled.
  • the cooling duct is in turn through a circumferential web 411 in the circumferential direction of the burner in divided in the radial direction, which web on both the heat shield and can be arranged on the support structure.
  • the heat protection shield is attached to the by means of bolts Carrier structure attached, which is not shown in the illustration Fig. 1 and Fig. 2 are.
  • the relatively soft attachment using a few bolts ensures one at least partial compensation of different thermal expansions, which is why they do not lead to pronounced mechanical stresses.
  • the support structure on which the swirl generator is mounted is in front excessive heat input protected. This makes it different Temperature is only marginally different from that of the swirl generator part, which is why also at the junction between the swirl generator and the Support structure stress increases due to different thermal expansion can be avoided.
  • the burner shown in perspective in FIGS. 1 and 2 is in one in FIG Longitudinal section shown.
  • the configuration is particularly important in this representation the front of the burner is clearly visible.
  • the swirl generator is fixed with the Support structure 42 connected.
  • Heat shield 41 mounted between the support structure and the Heat protection shield has a circumferential web 411. The bolt connection can be carried out so that a relative displacement between the Support structure and the heat shield is only slightly hindered.
  • the carrier structure is not directly on the Fixed combustion chamber wall, but this is by means of tubes or rods 33 also attached to the combustion chamber wall so that relative movements are only slightly hampered here due to thermal expansion.
  • holders are designed as tubes, which extended at the front of the support structure towards the combustion chamber and through the heat shield is passed through.
  • These tubes 33 can for Supply of a gaseous fuel 16 for the so-called pilot operation be used. If the burner air ratio is very high, the amount is sufficient of a gaseous fuel no longer, um, when supplied via the Premix gas supply 32 to ensure a stable premix flame. In Such an operating state is the amount of gas as a so-called pilot gas 16 supplied via lines 33, and then burns in one Diffusion flame. On the one hand, this generates significantly more nitrogen oxides but at high burner air ratios much more stable than a premix flame.
  • Fig. 4 shows a burner according to the invention with an alternative, but completely equivalent design of the swirl generator.
  • the swirl generator 100 namely not conical but cylindrical.
  • the extension the flow cross section of the burner cavity 14 is in this type achieved by creating a conical inside the burner Displacement body 8 is located, which tapers in the axial flow direction.
  • there is also one expanding swirl generator can be combined with a displacement body. In extreme cases, a tapering in the axial flow direction could even occur Swirl generators are used, in which an even more tapered Displacement body is used: Enlarged with the appropriate design the cross section of the cavity 14 in the swirl generator yet.
  • a liquid fuel nozzle 3 can be arranged in this displacement body be arranged, the arrangement shown here directly on the Cone tip is by no means mandatory.
  • Embodiments is a gaseous fuel 17 for the Premix operation here also via lines 32 into the swirled combustion air 15 introduced which lines have no rigid connection with the Have swirl generator 100.
  • the tangential entry slot 19 is in this Example does not continue immediately to the mouth of the burner; it can are said to be downstream to the burner mouth connects a mixing section to the swirl generator. This point is below discussed in more detail.
  • the design also bursts on the burner with cylindrical swirl generator premixed swirl flow at sudden cross-section transition from Burner interior to the combustion chamber 22, and thus forms the backflow zone 6 which ultimately stabilizes a flame.
  • FIG. 5 Another preferred embodiment of a cylindrical burner Swirl generator is shown in Fig. 5.
  • Displacer fully used for the fuel supply.
  • a line 35 conducts a liquid fuel 12 through the displacer 8 to a liquid fuel nozzle 3.
  • At a downstream end is the Displacement body completed.
  • a gaseous fuel 17 for the premix operation supplied by a number of openings 37 in the displacement body swirled combustion air 15 is added.
  • there are thermal tensions in the area of the premix gas supply not perfectly avoided, but are significantly lower than according to the state of the Technology.
  • the axial course of the swirl body contour in Combination with an inner displacement body in one Burner according to the invention can be varied within wide limits.
  • the displacement body can also have a number of different contours Have direction of the burner longitudinal axis without the invention in your To influence beings. It is crucial that in the interaction of the Swirl generator and the displacement body which flowed through axially Cross section within the swirl generator increases.
  • the structure of the swirl generator in cross section can be wide Certain conditions, for example fluid dynamic, reaction kinetic or manufacturing requirements become.
  • Figures 6 to 9 give a small insight into the multitude possible geometries.
  • the swirl generator consists of two in Cross-section of semicircular partial bodies 101, 102, each with an inlet guide section.
  • the central axes 101a and 102a of the two partial bodies are different from one another, as a result of which the tangential inlet openings 19 arise.
  • the partial body can of course also instead of semicircular be spiral or elliptical, or even oval, by which choice the Fine structure of the swirl flow in the swirl generator cavity is influenced.
  • the swirl generator can also consist of more than two against each other offset partial bodies exist, as shown in Fig. 7. 8 is a Swirl generator shown in cross section, consisting of four aerodynamic Bucket profiles 101, 102, 103, 104, which are arranged so that tangential inlet openings 19 also arise.
  • a Swirl generator shown in cross section, consisting of four aerodynamic Bucket profiles 101, 102, 103, 104, which are arranged so that tangential inlet openings 19 also arise.
  • a swirl generator 100 a mixing section 220 for an improved Mixing of fuel and combustion air in the axial direction of flow downstream of the burner.
  • the swirl generator is a conical swirl generator, consisting of four swirl generator parts shown, of which in selected section two partial bodies 101 and 102 completely and the partial body 103 are partially visible. Again each sub-body contains one Implementation 31 for a premix gas line 32, through which a gaseous Fuel 17 for the gas premix operation of the burner can be supplied.
  • the total of four premix gas lines are shown in the illustration only two visible, namely those through the partial bodies 101 and 102 are passed through. Again, these lines are light at the end designed nozzle-shaped.
  • the swirl generator Downstream of the The swirl generator is followed by a transition piece 200, which is shown in FIG is shown even larger. On the inner wall of the transition piece the wall geometry is designed so that that formed in the swirl generator Swirl flow 50 is transferred into a mixing tube 20 without loss. Therefore there are also a number of transition channels in the transition piece 200 201 incorporated the flow coming from each tangential Entry slot 19 flows into the burner interior 14, avoiding Discontinuities in the wall contour from the swirl generator leads to the mixing tube.
  • the Transition piece is installed in a mounting ring 10, which is the swirl generator 100, the transition piece 200 and the mixing tube 20 carries.
  • the mixing tube itself are tangential wall holes 21 through which an amount of air 151 flows into the mixing tube. This additional air prevents that there is an ignitable mixture in the flow boundary layer close to the wall is in which due to the locally low flow velocity A flame could reignite into the mixing tube.
  • the Mixing tube opens with a small transition radius and a tear-off edge 212 into the combustion chamber 22. Radially outside the tear-off edge is one circumferential groove incorporated in the front of the burner. Based on these A special configuration forms a detachment bubble 6 with a comparatively large radial, but a very small axial extent.
  • the front part of the burner shown as an example is, as detailed above discussed, provided with a heat shield.

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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)

Claims (23)

  1. Brûleur à prémélange, lequel brûleur à prémélange présente un sens d'écoulement axial ainsi qu'une extrémité amont et une extrémité aval, contenant un générateur de tourbillons (100) pour entraíner en rotation un fluide d'oxydation gazeux (15), et des moyens pour l'injection d'au moins un combustible (12, 17) dans l'écoulement tourbillonnaire ainsi produit, le fluide d'oxydation pénétrant à travers le générateur de tourbillons dans le brûleur à prémélange, et lequel générateur de tourbillons présentant également un sens d'écoulement axial, lequel générateur de tourbillons incluant un espace creux (14) et lequel générateur de tourbillons présentant au moins une fente (19) tangentielle s'étendant dans une direction axiale, à travers laquelle le fluide d'oxydation s'écoule dans l'espace creux dans la direction tangentielle, lequel espace creux présentant une section transversale d'écoulement, dont la surface en section transversale augmente au moins par sections vers l'extrémité aval du générateur de tourbillons, et lequel brûleur à prémélange présentant, à son extrémité aval un saut de section transversale, caractérisé en ce que le brûleur à prémélange est fixé, à son extrémité aval à une structure porteuse (42), en ce qu'en aval de la structure porteuse est disposé un écran thermique (41), lequel écran thermique est fixé à la structure porteuse de telle sorte qu'il n'y ait aucun contact direct entre la structure porteuse et l'écran thermique, et une distance étant prévue entre la structure porteuse et l'écran thermique, et en ce que des moyens de fixation (43), au moyen desquels l'écran de protection thermique est fixé à la structure porteuse, sont choisis de telle sorte qu'une possibilité de mouvement relative soit assurée entre l'écran de protection thermique et la structure porteuse.
  2. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le sens d'écoulement axial du générateur de tourbillons est identique au sens d'écoulement axial du brûleur à prémélange.
  3. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le générateur de tourbillons se compose d'un corps creux monolithique, dans lequel est réalisée au moins une fente (19) tangentielle, s'étendant dans la direction axiale du générateur de tourbillons.
  4. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le générateur de tourbillons se compose d'une pluralité de corps partiels (101, 102, 103, 104) dont les axes longitudinaux (101a, 102a, 103a, 104a) sont décalés les uns par rapport aux autres, de telle sorte qu'entre deux corps partiels respectifs, une fente (19) tangentielle s'étendant dans la direction de l'axe longitudinal du brûleur soit réalisée.
  5. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le générateur de tourbillons présente essentiellement une forme cylindrique.
  6. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le générateur de tourbillons présente une conicité de telle sorte que le diamètre du générateur de tourbillons s'élargisse de manière continue dans sa direction d'écoulement axiale.
  7. Brûleur à prémélange selon la revendication 1, caractérisé en ce qu'un corps de déplacement (8) se rétrécissant au moins par sections vers l'extrémité aval du brûleur est intégré dans l'espace creux (14).
  8. Brûleur à prémélange selon la revendication 1, caractérisé en ce que des moyens (3) pour l'introduction d'un combustible liquide (12) dans l'écoulement tourbillonnaire sont disposés à proximité de l'axe du brûleur.
  9. Brûleur à prémélange selon la revendication 1, caractérisé en ce que le générateur de tourbillons (100) ou les corps partiels (101, 102, 103, 104) du générateur de tourbillons présentent des ouvertures et en ce que pour l'injection d'un combustible gazeux pour le fonctionnement du brûleur avec une flamme de gaz prémélangé, des tubes (32) traversant les ouvertures (31) pénètrent dans l'espace creux (14) du générateur de tourbillons, lesquels tubes sont désaccouplés mécaniquement du générateur de tourbillons.
  10. Brûleur à prémélange selon la revendication 9, caractérisé en ce que les tubes présentent à leur extrémité une forme de buse.
  11. Brûleur à prémélange selon la revendication 1, caractérisé en ce qu'à chaque fente tangentielle (19) est associé au moins un moyen d'injection d'un combustible gazeux pour le fonctionnement du brûleur avec une flamme de gaz prémélangé.
  12. Brûleur à prémélange selon la revendication 7, caractérisé en ce que le corps de déplacement (8) est réalisé sous la forme d'un corps creux fermé, qui présente à une extrémité amont un raccord (36) pour un combustible gazeux (17), par le biais duquel du combustible gazeux est introduit dans le corps creux, et lequel corps de déplacement étant pourvu d'une pluralité d'ouvertures (37), à travers lesquelles un combustible gazeux (17) est introduit dans l'espace creux (14) pour le fonctionnement du brûleur avec une flamme de gaz prémélangé.
  13. Brûleur à prémélange selon la revendication 1, caractérisé en ce que la structure porteuse est fixée à la paroi de l'espace de combustion par des tubes ou des barres (33), qui s'étendent depuis la structure porteuse dans le sens opposé au sens d'écoulement axial du brûleur.
  14. Brûleur à prémélange selon la revendication 13, caractérisé en ce que les tubes (33) sont guidés à travers l'écran thermique et en ce que ces tubes constituent en même temps des conduites d'alimentation pour un combustible gazeux (16) pour le fonctionnement avec une flamme de diffusion de gaz.
  15. Brûleur à prémélange selon la revendication 1, caractérisé en ce que l'écran thermique est refroidi.
  16. Brûleur à prémélange selon la revendication 15, caractérisé en ce que la structure porteuse est pourvue d'une pluralité d'ouvertures (11) à travers lesquelles, en fonctionnement, s'écoule un réfrigérant (18), lequel réfrigérant réalise à la fois un refroidissement par convexion de la structure porteuse et un refroidissement par impact de l'écran thermique.
  17. Brûleur à prémélange selon la revendication 16, caractérisé en ce que le réfrigérant est le même fluide que le fluide d'oxydation.
  18. Brûleur à prémélange selon la revendication 15, caractérisé en ce que la distance entre l'écran thermique et la structure porteuse est un canal de refroidissement.
  19. Brûleur à prémélange selon la revendication 18, caractérisé en ce que le canal de refroidissement est divisé par une nervure périphérique (411).
  20. Brûleur à prémélange selon la revendication 1, caractérisé en ce qu'une section de mélange (220) est prévue en aval du générateur de tourbillons (100).
  21. Brûleur à prémélange selon la revendication 20, caractérisé en ce que la section de mélange est réalisée sous la forme d'un élément mélangeur tubulaire (20) dont l'axe longitudinal est essentiellement identique à l'axe du brûleur.
  22. Brûleur à prémélange selon la revendication 20, caractérisé en ce que dans la direction d'écoulement axial du brûleur entre le générateur de tourbillons (100) et la section de mélange (220), sont prévus des canaux de transition (201) s'étendant dans la direction de l'écoulement, pour le transfert dans la section de mélange de l'écoulement tourbillonnaire (50) formé dans le générateur de tourbillons.
  23. Brûleur à prémélange selon la revendication 22, caractérisé en ce que la pluralité de canaux de transition (201) correspond à la pluralité des fentes d'entrée tangentielles (19).
EP99114376A 1999-07-22 1999-07-22 Brûleur à prémélange Expired - Lifetime EP1070914B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59907942T DE59907942D1 (de) 1999-07-22 1999-07-22 Vormischbrenner
EP99114376A EP1070914B1 (fr) 1999-07-22 1999-07-22 Brûleur à prémélange
US09/624,258 US6331109B1 (en) 1999-07-22 2000-07-24 Premix burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99114376A EP1070914B1 (fr) 1999-07-22 1999-07-22 Brûleur à prémélange

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US6331109B1 (en) 2001-12-18
DE59907942D1 (de) 2004-01-15

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