EP0933593A2 - Dual fuel burner - Google Patents

Dual fuel burner Download PDF

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Publication number
EP0933593A2
EP0933593A2 EP98123875A EP98123875A EP0933593A2 EP 0933593 A2 EP0933593 A2 EP 0933593A2 EP 98123875 A EP98123875 A EP 98123875A EP 98123875 A EP98123875 A EP 98123875A EP 0933593 A2 EP0933593 A2 EP 0933593A2
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EP
European Patent Office
Prior art keywords
channel
fuel
atomizer
lip
gaseous fuel
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Application number
EP98123875A
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German (de)
French (fr)
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EP0933593A3 (en
EP0933593B1 (en
Inventor
Nikolaos Dr. Zarzalis
Wolfgang Prof. Dr.-Ing. Leuckel
Klaus Merkle
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MTU Aero Engines AG
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MTU Motoren und Turbinen Union Muenchen GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/005—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space with combinations of different spraying or vaporising means
    • F23D11/007—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space with combinations of different spraying or vaporising means combination of means covered by sub-groups F23D11/10 and F23D11/24
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/106—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet
    • F23D11/107—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet at least one of both being subjected to a swirling 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
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/11101—Pulverising gas flow impinging on fuel from pre-filming surface, e.g. lip atomizers

Definitions

  • the invention relates to a burner for the oxidation of liquid fuel with air, according to the preamble of claim 1, in training as Dual fuel burner.
  • the object of the invention is a burner of the generic type so kind of expand that it while maintaining its positive burning properties for operation with liquid and gaseous fuel suitable is.
  • the solution according to the invention is that an additional channel for the gaseous fuel is led into the interior of the atomizer lip and upstream of the atomizer edge, i.e. that for fuel processing ultimately authoritative position, in the primary and / or in the secondary Canal opens.
  • the additional channel can largely be designed as desired and in sections from a large number of interacting individual channels (e.g. holes) exist.
  • the gas admixture near the atomizer edge ensures a homogeneous mixing of the fuel components with sufficient Cooling of the burner - without the flame front retracting the air ducts.
  • a burner arrangement that can be operated with either liquid or gaseous fuel is already known from DE 28 20 702 C2. This points in Center a mixing ring with a mixing surface, which with a Airflow a spray of liquid fuel can be supplied and from which the fuel-air mixture enters the mixing ring. Gaseous fuel can be introduced into an air stream from the underside of the mixing ring. It is not planned to operate both fuels together.
  • the two-fuel burner 1, the longitudinal center axis of which is designated X, is fed with liquid fuel F via the atomizing nozzle 2.
  • the fuel emerges from the atomizing nozzle 2 in the form of a divergent spray cone 13 and strikes the inner surface of an annular one concentric with respect to the X axis Atomizer lip 3.
  • a downstream path forms on this Fuel film 14, which on the atomizer edge 4 as a result of there prevailing air flow conditions in a fine, air-permeated Fuel mist 15 is transformed.
  • the combustion air is in the form of two initially separate air flows L1 and L2 passed through the dual fuel burner 1.
  • the first airflow L1 arrives via a primary, central channel 5 through the spray cone area as the core flow to the atomizer edge 4 of the atomizer lip 3.
  • the second air flow L2 passes through a secondary, concentric channel 6 over the outer circumference the atomizer lip 3 to the atomizer edge 4, where it is on as a sheath flow hits the first air flow L1 and the liquid fuel.
  • the convergent-divergent Outer contour 10 of the secondary channel 6 with a narrowest cross section in the area of the atomizer edge 4 leads to flow conditions there, which promote the homogenization of the fuel-air mixture.
  • Means the swirl generator 8.9 can the currents in the channels 5 and 6th swirl movements in the same or opposite directions, i.e. Components in the circumferential direction be imprinted.
  • the two air flows L1 meet and L2 at the atomizer edge 4 result in speed differences in size and direction and circumferential components to shear and centrifugal forces, with their Help an intimate mixing of fuel and air can be achieved.
  • An additional channel 7 is provided for the gaseous fuel G, which between channels 5 and 6 of the combustion air separately into the interior the atomizer lip 3 leads. From there, the gaseous fuel is over Flow connections upstream of the atomizer edge 4 in the primary Channel 5, routed into secondary channel 6 or into both channels 5,6, i.e. With Air and possibly also combined with liquid fuel. It takes also the gaseous fuel on the initiated at the atomizer edge 4 Distribution process part.
  • the gaseous fuel will be like that liquid fuel directed into the primary, central channel 5.
  • the constructive The conditions for this are shown in a half section above the X axis. It can be seen that there is a coherent, annular opening the inside of the atomizer lip 3 forms the mouth of the channel 7. Just as well a variety of holes could form this mouth.
  • the gas leak takes place where the fuel film 14 is in liquid operation Moved towards atomizer edge 4. Because of the chosen mode of operation (alternatively) there is no liquid fuel / gas interaction, this is practical irrelevant.
  • liquid fuel film 14 on the atomizer lip surface also has an important cooling function. That's why the gas may be appropriate at several, locally narrowly limited To pass through the fuel film 14, so that between these points sufficiently large, undisturbed film zones remain.

Abstract

The burner (1) is also capable of running on gaseous fuel (G) supplied via a channel (7) between the prim. and sec. supply channels (5, 6) for combustion air (L1, L2). The gaseous fuel supply channel leads into the inside of the atomising nozzle lip (3), opening out into the prim. and/or sec. air supply channel upstream from the nozzle edge (4) forming the rear end of the lip. The atomising nozzle (2) generates a spray cone (13) formed when the liquid fuel (F) impinges against a nozzle lip with a concentric arrangement relative to the nozzle central axis (X). The prim. air supply channel leading to the spray cone passes through the inside of the nozzle lip, whilst the sec. air supply channel extends over the outside of the lip, combining with the prim. air supply channel to form an enveloping flow of air.

Description

Die Erfindung betrifft einen Brenner für die Oxidation von flüssigem Brennstoff mit Luft, gemäß dem Oberbegriff des Patentanspruches 1, in Ausbildung als Zweistoffbrenner.The invention relates to a burner for the oxidation of liquid fuel with air, according to the preamble of claim 1, in training as Dual fuel burner.

Ein gattungsgemäßer, für Einstoffbetrieb mit flüssigem Brennstoff ausgelegter Brenner ist aus der DE 196 27 760 A1 bekannt. Dieses Brennerkonzept dient der weitgehend homogenen Verteilung eines Luftbrennstoffgemisches im Brennraum zur Reduktion von Schadstoffemissionen. Dabei ist der divergente Spritzkegel einer Zerstäuberdüse auf eine als Prallkörper wirkende Zerstäuberlippe gerichtet, auf deren Innenseite sich ein stromabwärts bewegender Brennstoffilm bildet. Der Brennstoffilm wandert bis zu einer Zerstäuberkante am hinteren Ende der Zerstäuberlippe, wo er durch eine Luftführung mit zwei sich vereinigenden Luftströmen (primär und sekundär) sowie eine lokale Querschnittsverengung hohen Scherkräften unterliegt und dadurch besonders fein und homogen zerstäubt wird. Die bevorzugte Anwendung dieser Brenner erfolgt in mit Kerosin betriebenen Fluggasturbinen.A generic one, designed for single-fuel operation with liquid fuel Brenner is known from DE 196 27 760 A1. This burner concept serves the largely homogeneous distribution of an air fuel mixture in the Combustion chamber to reduce pollutant emissions. Here is the divergent Spray cone of an atomizer nozzle on an atomizer lip acting as a baffle directed, on the inside of which a downstream moving Fuel film forms. The fuel film travels to an atomizer edge at the rear end of the atomizer lip, where it passes through an air duct with two unifying air flows (primary and secondary) as well as a local cross-sectional narrowing subject to high shear forces and therefore particularly fine and is atomized homogeneously. These burners are preferred for use in kerosene-powered gas turbines.

Bei stationären Gasturbinen, welche als schnell zu- und abschaltbare Kraftmaschinen hoher Leistung in zunehmendem Maße in Kraftwerken zur Stromerzeugung (Spitzenlast) verwendet werden, wird im Hinblick auf eine uneingeschränkte Einsatzbereitschaft vermehrt die Eignung für Betrieb mit gasförmigem und mit flüssigem Brennstoff gefordert. Für den

Figure 00010001
normalen" Betrieb ist beispielsweise Erdgas, für einen Notbetrieb" leichtes Heizöl vorgesehen. Dabei können auch Betriebszustände auftreten bzw. vorgesehen sein, in denen beide Brennstoffe gleichzeitig eingespeist werden. Abgesehen von dieser speziellen Anwendung kann der Zweistoffbetrieb" bzw. die Eignung hierfür bei verschiedenen Brenneranwendungen Vorteile bieten. In the case of stationary gas turbines, which are increasingly being used as high-power engines that can be quickly switched on and off in power plants to generate electricity (peak load), the suitability for operation with gaseous and liquid fuel is increasingly being demanded with regard to unrestricted operational readiness. For the
Figure 00010001
For example, normal "operation is natural gas, for one Light fuel oil is provided. Operating states can also occur or are provided in which both fuels are fed in simultaneously. Apart from this special application, the Dual-fuel operation "or the suitability for this in various burner applications offer advantages.

Daher besteht die Aufgabe der Erfindung darin, einen Brenner gattungsgemäßer so Art zu erweitern, daß er unter Beibehaltung seiner positiven Brenneigenschaften für einen Betrieb mit flüssigem und mit gasförmigem Brennstoff geeignet ist.Therefore, the object of the invention is a burner of the generic type so kind of expand that it while maintaining its positive burning properties for operation with liquid and gaseous fuel suitable is.

Diese Aufgabe wird durch die im Anspruch 1 gekennzeichneten Merkmale gelöst, in Verbindung mit den gattungsbildenden Merkmalen in dessen Oberbegriff.This object is achieved by the features characterized in claim 1, in connection with the generic features in its generic term.

Die Unteransprüche kennzeichnen bevorzugte Ausgestaltungen des Zweistoffbrenners nach dem Hauptanspruch.The subclaims characterize preferred configurations of the two-fuel burner according to the main claim.

Die erfindungsgemäße Lösung besteht darin, daß ein zusätzlicher Kanal für den gasförmigen Brennstoff in das Innere der Zerstäuberlippe geführt ist und stromaufwärts der Zerstäuberkante, also der für die Brennstoffaufbereitung letztlich maßgeblichen Stelle, in den primären und/oder in den sekundären Kanal mündet. Der zusätzliche Kanal kann weitgehend beliebig gestaltet sein und abschnittsweise aus einer Vielzahl von zusammenwirkenden Einzelkanälen (z.B. Bohrungen) bestehen. Die Gaszumischung nahe der Zerstäuberkante gewährleistet eine homogene Durchmischung der Brennkomponenten bei ausreichender Kühlung des Brenners -ohne ein Zurückschlagen der Flammenfront in die Luftkanäle.The solution according to the invention is that an additional channel for the gaseous fuel is led into the interior of the atomizer lip and upstream of the atomizer edge, i.e. that for fuel processing ultimately authoritative position, in the primary and / or in the secondary Canal opens. The additional channel can largely be designed as desired and in sections from a large number of interacting individual channels (e.g. holes) exist. The gas admixture near the atomizer edge ensures a homogeneous mixing of the fuel components with sufficient Cooling of the burner - without the flame front retracting the air ducts.

Eine wahlweise mit flüssigem oder gasförmigem Brennstoff betreibbare Brenneranordnung ist bereits aus der DE 28 20 702 C2 bekannt. Diese weist im Zentrum einen Mischungsring mit einer Mischfläche auf, welcher mit einem Luftstrom ein Sprühnebel flüssigen Brennstoffs zuführbar ist und von welcher das Brennstoff-Luft-Gemisch in den Mischungsring eintritt. Gasförmiger Brennstoff ist von der Unterseite des Mischungsringes her in einen Luftstrom einleitbar. Ein gemeinsamer Betrieb beider Brennstoffe ist nicht vorgesehen. A burner arrangement that can be operated with either liquid or gaseous fuel is already known from DE 28 20 702 C2. This points in Center a mixing ring with a mixing surface, which with a Airflow a spray of liquid fuel can be supplied and from which the fuel-air mixture enters the mixing ring. Gaseous fuel can be introduced into an air stream from the underside of the mixing ring. It is not planned to operate both fuels together.

Die Erfindung wird anschließend anhand der Figur noch näher erläutert. Diese zeigt in vereinfachter, nicht maßstäblicher Darstellung zwei in übereinanderliegenden, durch die Brennerachse getrennten Halbschnitten wiedergegebene Brennervarianten mit unterschiedlicher Gaszumischung.The invention is explained in more detail with reference to the figure. This shows in a simplified, not to scale representation two in superimposed, half sections reproduced by the burner axis Burner variants with different gas admixtures.

Der Zweistoffbrenner 1, dessen Längsmittelachse mit X bezeichnet ist, wird über die Zerstäuberdüse 2 mit flüssigem Brennstoff F gespeist. Der Brennstoff tritt aus der Zerstäuberdüse 2 in Form eines divergenten Spritzkegels 13 aus und trifft auf die Innenfläche einer bezüglich der Achse X konzentrischen, ringförmigen Zerstäuberlippe 3. Auf dieser bildet sich ein stromabwärts wandern-der Brennstoffilm 14 aus, welcher an der Zerstäuberkante 4 infolge der dort herrschenden Luftströmungsverhältnisse in einen feinen, luftdurchsetzten Brennstoffnebel 15 verwandelt wird.The two-fuel burner 1, the longitudinal center axis of which is designated X, is fed with liquid fuel F via the atomizing nozzle 2. The fuel emerges from the atomizing nozzle 2 in the form of a divergent spray cone 13 and strikes the inner surface of an annular one concentric with respect to the X axis Atomizer lip 3. A downstream path forms on this Fuel film 14, which on the atomizer edge 4 as a result of there prevailing air flow conditions in a fine, air-permeated Fuel mist 15 is transformed.

Die Verbrennungsluft wird in Form zweier, zunächst getrennter Luftströme L1 und L2 durch den Zweistoffbrenner 1 geführt. Der erste Luftstrom L1 gelangt über einen primären, zentralen Kanal 5 durch den Spritzkegelbereich als Kernstrom zur Zerstäuberkante 4 der Zerstäuberlippe 3. Der zweite Luftstrom L2 gelangt durch einen sekundären, konzentrischen Kanal 6 über den Außenumfang der Zerstäuberlippe 3 zur Zerstäuberkante 4, wo er als Mantelstrom auf den ersten Luftstrom L1 sowie den flüssigen Brennstoff trifft. Die konvergent-divergente Außenkontur 10 des sekundären Kanals 6 mit einem engsten Querschnitt im Bereich der Zerstäuberkante 4 führt dort zu Strömungsverhältnissen, welche die Homogenisierung des Brennstoff-Luft-Gemisches fördern. Mittels der Drallerzeuger 8,9 können den Strömungen in den Kanälen 5 und 6 gleich- oder gegensinnige Drallbewegungen, d.h. Komponenten in Umfangsrichtung aufgeprägt werden. Beim Zusammentreffen der beiden Luftströme L1 und L2 an der Zerstäuberkante 4 führen Geschwindigkeitsdifferenzen in Größe und Richtung sowie Umfangskomponenten zu Scher- und Fliehkräften, mit deren Hilfe sich eine innige Durchmischung von Brennstoff und Luft erzielen läßt. Dabei möchte man den Brennstoff auf einer möglichst kurzen axialen Mischstrecke in möglichst kleine, homogen verteilte Tröpfchen mit großer oxidierbarer Gesamtoberfläche umsetzen, wobei die Gemischzone sich ebenfalls auf möglichst kurzem, axialem Weg auf einen vorgegebenen Querschnitt, insbesondere den Brennkammerquerschnitt, erweitern sollte, d.h. stark divergieren sollte.The combustion air is in the form of two initially separate air flows L1 and L2 passed through the dual fuel burner 1. The first airflow L1 arrives via a primary, central channel 5 through the spray cone area as the core flow to the atomizer edge 4 of the atomizer lip 3. The second air flow L2 passes through a secondary, concentric channel 6 over the outer circumference the atomizer lip 3 to the atomizer edge 4, where it is on as a sheath flow hits the first air flow L1 and the liquid fuel. The convergent-divergent Outer contour 10 of the secondary channel 6 with a narrowest cross section in the area of the atomizer edge 4 leads to flow conditions there, which promote the homogenization of the fuel-air mixture. Means the swirl generator 8.9 can the currents in the channels 5 and 6th swirl movements in the same or opposite directions, i.e. Components in the circumferential direction be imprinted. When the two air flows L1 meet and L2 at the atomizer edge 4 result in speed differences in size and direction and circumferential components to shear and centrifugal forces, with their Help an intimate mixing of fuel and air can be achieved. You want the fuel to be as short as possible in an axial mixing section in the smallest possible, homogeneously distributed droplets with large oxidizable Implement the entire surface, the mixture zone also opening up axial path as short as possible to a predetermined cross section, in particular the combustion chamber cross-section, i.e. diverge strongly should.

Bis hierher beziehen sich die Ausführungen auf die Aufbereitung des flüssigen Brennstoffes.So far, the explanations refer to the preparation of the liquid Fuel.

Für den gasförmigen Brennstoff G ist ein zusätzlicher Kanal 7 vorgesehen, welcher zwischen den Kanälen 5 und 6 der Verbrennungsluft separat in das Innere der Zerstäuberlippe 3 führt. Von dort wird der gasförmige Brennstoff über Strömungsverbindungen stromaufwärts der Zerstäuberkante 4 in den primären Kanal 5, in den sekundären Kanal 6 oder in beide Kanäle 5,6 geleitet, d.h. mit Luft und ggf. auch mit flüssigem Brennstoff zusammengeführt. Dabei nimmt auch der gasförmige Brennstoff an dem bei der Zerstäuberkante 4 initiierten Verteilungsprozeß teil.An additional channel 7 is provided for the gaseous fuel G, which between channels 5 and 6 of the combustion air separately into the interior the atomizer lip 3 leads. From there, the gaseous fuel is over Flow connections upstream of the atomizer edge 4 in the primary Channel 5, routed into secondary channel 6 or into both channels 5,6, i.e. With Air and possibly also combined with liquid fuel. It takes also the gaseous fuel on the initiated at the atomizer edge 4 Distribution process part.

Falls der Zweistoffbrenner 1 zeitlich getrennt entweder mit Flüssigbrennstoff oder mit Gas betrieben werden soll, werden der gasförmige Brennstoff wie der flüssige Brennstoff in den primären, zentralen Kanal 5 geleitet. Die konstruktiven Gegebenheiten hierfür sind im Halbschnitt oberhalb der Achse X wiedergegeben. Man erkennt, daß eine zusammenhängende, ringförmige Öffnung auf der Innenseite der Zerstäuberlippe 3 die Mündung des Kanals 7 bildet. Ebensogut könnte eine Vielzahl von Bohrungen diese Mündung bilden. Der Gasaustritt erfolgt also dort, wo sich im Flüssigkeitsbetrieb der Brennstoffilm 14 in Richtung Zerstäuberkante 4 bewegt. Da durch die gewählte Betriebsweise (alternativ) keine Wechselwirkung Flüssigbrennstoff/Gas auftritt, ist dies praktisch ohne Belang. If the two-fuel burner 1 is separated in time either with liquid fuel or to be operated with gas, the gaseous fuel will be like that liquid fuel directed into the primary, central channel 5. The constructive The conditions for this are shown in a half section above the X axis. It can be seen that there is a coherent, annular opening the inside of the atomizer lip 3 forms the mouth of the channel 7. Just as well a variety of holes could form this mouth. The gas leak takes place where the fuel film 14 is in liquid operation Moved towards atomizer edge 4. Because of the chosen mode of operation (alternatively) there is no liquid fuel / gas interaction, this is practical irrelevant.

Anders liegen die Verhältnisse bei gleichzeitigem, d.h. kombiniertem, Betrieb mit Flüssigbrennstoff und Gas. Die hierfür gedachte Bauweise ist im Halbschnitt unterhalb der Achse X dargestellt. Da es nachteilig sein kann, den Brennstoffilm 14 (flüssig) durch die Gaszufuhr großteils bis vollständig zu zerstören, bevor dieser die Zerstäuberkante 4 erreicht, ist vorgesehen, den gasförmigen Brennstoff teilweise oder ausschließlich in den sekundären, von flüssigem Brennstoff freien Kanal 6 zu leiten. Hierfür sind durch die Außenwand der Zerstäuberlippe 3 stoßende Bohrungen 11 geeignet. Zusätzlich können Bohrungen 12 (gestrichelt) oder andere Öffnungen vorhanden sein, welche einen Teil des gasförmigen Brennstoffstromes durch den flüssigen Brennstoffilm hindurch freisetzen.The situation is different with simultaneous, i.e. combined, operation with liquid fuel and gas. The construction intended for this is in half section shown below the X axis. Since it can be disadvantageous To destroy fuel film 14 (liquid) largely to completely by the gas supply, Before it reaches the atomizer edge 4, the gaseous one is provided Fuel partially or exclusively in the secondary, from liquid To direct fuel free channel 6. For this are through the outer wall the nebulizer lip 3 suitable bores 11. In addition, you can Bores 12 (dashed) or other openings may be present, which part of the gaseous fuel flow through the liquid fuel film release through.

An dieser Stelle sei darauf hingewiesen, daß der flüssige Brennstoffilm 14 auf der Zerstäuberlippenoberfläche auch eine wichtige Kühlfunktion ausübt. Deshalb kann es angebracht sein, das Gas an mehreren, lokal eng begrenzten Stellen durch den Brennstoffilm 14 zu leiten, so daß zwischen diesen Stellen ausreichend große, ungestörte Filmzonen verbleiben.At this point it should be noted that the liquid fuel film 14 on the atomizer lip surface also has an important cooling function. That's why the gas may be appropriate at several, locally narrowly limited To pass through the fuel film 14, so that between these points sufficiently large, undisturbed film zones remain.

Claims (6)

Brenner für die Oxidation von flüssigem Brennstoff mit Luft, insbesondere zur Verwendung in Brennkammern stationärer Gasturbinen, mit einer einen divergenten Spritzkegel erzeugenden Zerstäuberdüse für den Brennstoff, mit einer ringförmigen, zur Düsenachse konzentrischen, einen Prallkörper für den Spritzkegel bildenden Zerstäuberlippe, mit einem primären, einen ersten Luftstrom zum Spritzkegel sowie durch den Innenquerschnitt der Zerstäuberlippe leitenden Kanal und mit einem sekundären, einen zweiten Luftstrom über die Außenseite der Zerstäuberlippe leitenden sowie diesen als Mantelstrom mit dem ersten Luftstrom zusammenführenden Kanal, dadurch gekennzeichnet,
daß in Ausbildung als Zweistoffbrenner zwischen dem primären (5) und dem sekundären Kanal (6) ein Kanal (7) für gasförmigen Brennstoff in das Innere der Zerstäuberlippe (3) führt und stromaufwärts der das hintere Ende der Zerstäuberlippe (3) bildenden Zerstäuberkante (4) in den primären (5) und/oder in den sekundären Kanal (6) mündet.Burner for the oxidation of liquid fuel with air, in particular for use in combustion chambers of stationary gas turbines, with an atomizing nozzle for the fuel producing a divergent spray cone, with an annular atomizing lip concentric to the nozzle axis, forming an impact body for the spray cone, with a primary one first air stream to the spray cone and by the inner cross section of the atomizer lip and a secondary channel, a second air stream leading through the outside of the atomizer lip and leading this as a shroud with the first air stream, characterized in that
that in training as a dual-fuel burner between the primary (5) and the secondary channel (6) a channel (7) for gaseous fuel leads into the interior of the atomizer lip (3) and upstream of the atomizer edge (4) forming the rear end of the atomizer lip (3) ) opens into the primary (5) and / or into the secondary channel (6). Brenner nach Anspruch 1, für einen - zumindest zeitweise - gleichzeitigen Betrieb mit flüssigem und mit gasförmigem Brennstoff, dadurch gekennzeichnet, daß der Kanal (7) für den gasförmigen Brennstoff stromaufwärts der Zerstäuberkante (4) entweder nur in den sekundären Kanal (6) oder in den primären (5) und in den sekundären Kanal (6) mündet. Burner according to claim 1, for a - at least temporarily - simultaneous Operation with liquid and with gaseous fuel, characterized in that that the channel (7) for the gaseous fuel upstream the atomizer edge (4) either only in the secondary channel (6) or in the primary (5) and in the secondary channel (6) opens. Brenner nach Anspruch 1, für einen zeitlich versetzten Betrieb mit flüssigem oder mit gasförmigem Brennstoff, dadurch gekennzeichnet, daß der Kanal (7) für den gasförmigen Brennstoff stromaufwärts der Zerstäuberkante (4) in den primären Kanal (5) mündet.Burner according to claim 1, for a staggered operation with liquid or with gaseous fuel, characterized in that the channel (7) for the gaseous fuel upstream of the atomizer edge (4) in the primary channel (5) opens. Brenner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Kanal (7) für den gasförmigen Brennstoff im Austrittsbereich einen zusammenhängenden, ringförmigen Strömungsquerschnitt und/oder eine Vielzahl einzelner Strömungsquerschnitte aufweist, insbesondere eine Vielzahl von Bohrungen (11,12).Burner according to one of claims 1 to 3, characterized in that the channel (7) for the gaseous fuel in the outlet area is a coherent, annular flow cross section and / or a Has a large number of individual flow cross sections, in particular a large number of holes (11.12). Brenner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der primäre (5) und der sekundäre Kanal (6) eintrittsseitig mit Drallerzeugern (8,9), z. B. in Form von Leitschaufeln, versehen sind, wobei in den Kanälen (5,6) der Drall gleich- oder gegensinnig ist.Burner according to one of claims 1 to 4, characterized in that the primary (5) and the secondary channel (6) on the inlet side with swirl generators (8.9), e.g. B. in the form of guide vanes, provided in the channels (5,6) the swirl is the same or opposite. Brenner nach Anspruch 5, dadurch gekennzeichnet, daß der sekundäre Kanal (6) stromabwärts des Drallerzeugers (9) eine konvergent-divergente Außenkontur (10) aufweist, deren engster Querschnitt zumindest annähernd an der gleichen axialen Position wie die Zerstäuberkante (4) steht.Burner according to claim 5, characterized in that the secondary channel (6) downstream of the swirl generator (9) a convergent-divergent outer contour (10), whose narrowest cross section is at least approximately is in the same axial position as the atomizer edge (4).
EP98123875A 1998-01-31 1998-12-16 Dual fuel burner Expired - Lifetime EP0933593B1 (en)

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DE19803879A DE19803879C1 (en) 1998-01-31 1998-01-31 Dual fuel burner
DE19803879 1998-01-31

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EP0933593A3 EP0933593A3 (en) 2000-01-19
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Also Published As

Publication number Publication date
US6068470A (en) 2000-05-30
JPH11248114A (en) 1999-09-14
DE19803879C1 (en) 1999-08-26
EP0933593A3 (en) 2000-01-19
EP0933593B1 (en) 2003-05-14

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