WO2014114535A1 - Burner having a central fuel-supplying assembly - Google Patents

Burner having a central fuel-supplying assembly Download PDF

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Publication number
WO2014114535A1
WO2014114535A1 PCT/EP2014/050687 EP2014050687W WO2014114535A1 WO 2014114535 A1 WO2014114535 A1 WO 2014114535A1 EP 2014050687 W EP2014050687 W EP 2014050687W WO 2014114535 A1 WO2014114535 A1 WO 2014114535A1
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WIPO (PCT)
Prior art keywords
fuel
central
nozzles
fuel supply
burner
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PCT/EP2014/050687
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German (de)
French (fr)
Inventor
Jürgen MEISL
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Siemens Aktiengesellschaft
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Publication of WO2014114535A1 publication Critical patent/WO2014114535A1/en

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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
    • 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
    • F23R3/36—Supply of different fuels
    • 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
    • F23D2900/00016—Preventing or reducing deposit build-up on burner parts, e.g. from carbon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/00004—Preventing formation of deposits on surfaces of gas turbine components, e.g. coke deposits

Definitions

  • Burner with a central fuel supply arrangement The invention relates to a burner with a central one
  • Fuel supply arrangement for lean premix combustion also for liquid fuels with increased coking tendency.
  • burners have been developed in recent years that have particularly low emissions of nitrogen oxides (NOx).
  • NOx nitrogen oxides
  • Such burners can be operated either selectively or in combination not only with one fuel, but also with different fuels, for example oil and natural gas, in order to increase the supply reliability and flexibility of the operation.
  • Such burners are described, for example, in EP 0 276 696 B1.
  • the burner described in EP 0 276 696 B1 is a hybrid burner for premixing operation with gas and / or oil, as it is used in particular for gas turbine plants.
  • the burner comprises a central fuel supply arrangement, in which also a pilot burner system is integrated, which is operable with gas and / or oil as a so-called diffusion burner or as a separate premix burner.
  • a pilot burner system is integrated, which is operable with gas and / or oil as a so-called diffusion burner or as a separate premix burner.
  • the central fuel supply assembly is surrounded by a main burner system having an air supply annular channel system with a swirler blading therein having a plurality of vanes and pre-mixing gas nozzles located upstream of the vanes.
  • inlet nozzles for oil in the area of the swirl vanes are present in the fuel supply arrangement, which allow premixing of the main air flow with oil.
  • the fuel gas can also be injected through arranged in the swirl blades nozzle orifices in the air duct, as described for example in EP 0 580 683 Bl.
  • the object of the invention is to provide a burner of the type mentioned, in which the ⁇ l -Verkokung is avoided in the internal oil distribution system of premix burners.
  • the invention solves this problem by providing that in such a burner having a central fuel supply arrangement, an annular air duct surrounding the central fuel supply arrangement for supplying combustion air, first fuel nozzles for injecting a substantially gaseous fuel into the annular air duct, wherein the first fuel nozzles of a first fuel distributors in the fuel supply arrangement and second fuel nozzles for injecting a substantially liquid fuel into the annular air channel, the second fuel nozzles being fed from a second fuel distributor in the first fuel distributor
  • Fuel supply arrangement are fed, the second fuel distributor in the central fuel supply assembly through an air gap substantially from the rest of the central Fuel supply arrangement is thermally decoupled, wherein the second fuel nozzles are arranged in the central fuel supply arrangement on the annular air channel and in the region of the second fuel nozzles, the air gaps relative to the annular air duct are closed.
  • the invention is based on the recognition that the oxygen responsible for the oil coking in the oil can not be completely removed and therefore coking must be prevented or reduced by reducing the heat input.
  • the burner internal ⁇ lvertei- is largely thermally separated from the rest of the burner, so that the oil distribution channel is not just a channel in the burner body, as in previous hybrid burners, but is largely separated by a surrounding air gap from the rest of the burner ,
  • the central fuel supply assembly includes not only the second fuel distributor for the second fuel nozzles for injecting a substantially liquid fuel, but also the corresponding fuel supply to the second fuel distributor. It is therefore advantageous if this fuel supply is also thermally decoupled by an air gap substantially from the rest of the central fuel supply arrangement.
  • the heat flow is reduced to the oil distribution channel, reduces the heating of the oil and lowered the coking risk.
  • the reduction of the heat input is a necessary condition for a permanent and trouble-free combustion. free operation.
  • the advantages of the invention can also be used for fuels with low to moderate coking tendency.
  • the burner 1 according to the invention which can optionally be used in conjunction with a plurality of identical burners, for example in the combustion chamber of a gas turbine plant, comprises an inner pilot burner system and a main burner system concentrically surrounding the pilot burner system.
  • the figure essentially shows the main burner system. Both the pilot burner system and the main burner system may optionally be operated with gaseous and / or liquid fuels, such as natural gas or fuel oil.
  • the main burner system comprises a central fuel supply arrangement 2 and an annular air channel 3 surrounding this central fuel supply arrangement 2, through which a plurality of swirl vanes 11 of a swirl blading extend. These swirl vanes 11 have first fuel nozzles 4, through which fuel gas in the inflowing through the annular air channel 3
  • Air 12 can be injected.
  • oil or other liquid fuels
  • air 12 can be injected into the air 12 flowing through the annular air channel 3 by means of second fuel nozzles 6.
  • the arranged in the swirl vanes 11 first fuel nozzles 4, as well as arranged in the central fuel supply assembly 2 on the annular air duct 3 second fuel nozzles 6 are supplied via the central fuel supply assembly 2, the so-called hub with fuel.
  • first 5 and second fuel distributor 7 are arranged, which supply the first fuel nozzles 4 with gaseous and the second fuel nozzles 6 with liquid fuel.
  • the central fuel supply arrangement 2 comprises fuel feeds.
  • the figure shows the BrennstoffZu arrangement 9 for the second fuel distributor 7, ie the oil supply.
  • the second fuel distributor 7 in the central fuel supply arrangement 2 is substantially thermally decoupled from the remainder of the central fuel supply arrangement 2 by an air gap 8 surrounding it, which is closed in the region of the second fuel nozzles 6 with respect to the annular air duct 3, for example by welding (End 13 for air gap 8), so as to avoid a flow through the air gap 8 with Ver whorend Kunststoff 12.
  • the fuel supply 9 to the second fuel distributor 7 is thermally decoupled from the rest of the central fuel supply arrangement 2 by an air gap 10.
  • the second fuel distributor 7 and the fuel feed 9 are free of oil. Thus, it can not come to a coking in these areas.
  • oil operation the coking is now avoided or at least reduced, that a better cooling of the second fuel distributor 7 and the fuel supply 9 by the flowing oil itself, because due to the air gaps 8, 10 a smaller amount of heat from the annular air duct 3 at the second

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

Abstract

The invention relates to a burner (1), having a central fuel-supplying assembly (2), an annular air channel (3) surrounding the central fuel-supplying assembly (2) for supplying combustion air, first fuel nozzles (4) for injecting a substantially gaseous fuel into the annular air channel (3), wherein the first fuel nozzles (4) are fed by a first fuel distributor (5) in the central fuel-supplying assembly (2), and second fuel nozzles for injecting a substantially liquid fuel into the annular air channel (3), wherein the second fuel nozzles are fed by a second fuel distributor (7) in the central fuel-supplying assembly (2) and wherein the second fuel distributor (7) in the central fuel-supplying assembly (2) is substantially thermally decoupled from the rest of the central fuel-supplying assembly (2) by an air gap (8), wherein the second fuel nozzles are arranged adjacent to the annular air channel (3) in the central fuel-supplying assembly (2) and the air gaps (8) are closed off from the annular air channel (3) in the region of the second fuel nozzles.

Description

Beschreibung description
Brenner mit einer zentralen Brennstoffzufuhranordnung Die Erfindung betrifft einen Brenner mit einer zentralenBurner with a central fuel supply arrangement The invention relates to a burner with a central one
Brennstoffzufuhranordnung für magere Vormischverbrennung auch für flüssige Brennstoffe mit erhöhter Verkokungsneigung . Fuel supply arrangement for lean premix combustion also for liquid fuels with increased coking tendency.
Im Hinblick auf die weltweiten Bemühungen zur Senkung des Schadstoffausstoßes von Befeuerungsanlagen, insbesondere bei Gasturbinen, wurden in den letzten Jahren Brenner entwickelt, die besonders geringe Ausstöße an Stickoxiden (NOx) aufweisen. Dabei wird vielfach Wert darauf gelegt, dass solche Brenner jeweils nicht nur mit einem Brennstoff, sondern mög- liehst mit verschiedenen Brennstoffen, beispielsweise Öl und Erdgas wahlweise oder in Kombination betreibbar sind, um die Versorgungssicherheit und Flexibilität des Betriebs zu erhöhen. Solche Brenner sind beispielsweise in der EP 0 276 696 Bl beschrieben. In view of the global efforts to reduce pollutant emissions from firing systems, particularly in gas turbines, burners have been developed in recent years that have particularly low emissions of nitrogen oxides (NOx). In the process, it is often emphasized that such burners can be operated either selectively or in combination not only with one fuel, but also with different fuels, for example oil and natural gas, in order to increase the supply reliability and flexibility of the operation. Such burners are described, for example, in EP 0 276 696 B1.
Der in EP 0 276 696 Bl beschriebene Brenner ist ein Hybridbrenner für Vormischbetrieb mit Gas und/oder Öl, wie er insbesondere für Gasturbinenanlagen angewendet wird. Der Brenner umfasst eine zentrale Brennstoffzufuhranordnung, in die auch ein Pilotbrennersystem integriert ist, welches mit Gas und/oder Öl als ein sogenannter Diffusionsbrenner oder als gesonderter Vormischbrenner betreibbar ist. Zusätzlich ist die Möglichkeit zur Einspeisung von Inertstoffen vorgesehen. Die zentrale Brennstoffzufuhranordnung ist von einem Haupt- brennersystem umgeben, welches ein Luftzufuhr-Ringkanalsystem mit einer darin befindlichen Drallbeschaufelung mit einer Mehrzahl von Schaufeln und stromauf von den Schaufeln angeordneten Düsenrohren für den Vormischbetrieb mit Gas aufweist. Zusätzlich sind in der Brennstoffzufuhranordnung Ein- lassdüsen für Öl im Bereich der Drallbeschaufelung vorhanden, die eine Vormischung des Hauptluftstroms mit Öl ermöglichen. Statt wie in EP 0 276 696 Bl mittels stromauf von den The burner described in EP 0 276 696 B1 is a hybrid burner for premixing operation with gas and / or oil, as it is used in particular for gas turbine plants. The burner comprises a central fuel supply arrangement, in which also a pilot burner system is integrated, which is operable with gas and / or oil as a so-called diffusion burner or as a separate premix burner. In addition, the possibility for feeding in inert materials is provided. The central fuel supply assembly is surrounded by a main burner system having an air supply annular channel system with a swirler blading therein having a plurality of vanes and pre-mixing gas nozzles located upstream of the vanes. In addition, inlet nozzles for oil in the area of the swirl vanes are present in the fuel supply arrangement, which allow premixing of the main air flow with oil. Instead of as in EP 0 276 696 B1 by means of upstream of the
Drallschaufeln gelegener Düsenrohre kann das Brenngas auch durch in den Drallschaufeln selbst angeordnete Düsenöffnungen in den Luftkanal eingedüst werden, wie dies beispielsweise in EP 0 580 683 Bl beschrieben ist. Swirl blades located nozzle pipes, the fuel gas can also be injected through arranged in the swirl blades nozzle orifices in the air duct, as described for example in EP 0 580 683 Bl.
Diese Verbrennungstechnik der mageren Vormischverbrennung wird aber üblicherweise für flüssige Brennstoffe mit erhöhter Verkokungsneigung, z.B. Crude Oil, nicht eingesetzt, da die hierfür notwendige "Multi Point Injection" ein Verteilersystem innerhalb des Brenners und kleine Düsen benötigt. Da in diesen Brennstoffen stets eine wenn auch geringe Menge Sauerstoff vorhanden ist, können während des Betriebs aufgrund des Wärmeeintrags der heißen Verdichterluft (>400°C) im Vertei- lersystem innerhalb des Brenners Verkokungen auftreten. Mit zunehmender Betriebszeit können sich so Beläge bilden, die insbesondere wenn sie abplatzen die Düsen verstopfen können und die Betriebsfähigkeit des Brenners herabsetzen oder nicht mehr zulassen. However, this lean premix combustion technique is commonly used for liquid fuels with increased coking tendency, e.g. Crude Oil, not used, as the "Multi Point Injection" required for this purpose requires a distributor system inside the burner and small nozzles. Since there is always a small amount of oxygen in these fuels, coking may occur during operation due to the heat input of the hot compressor air (> 400 ° C) in the distribution system within the burner. With increasing operating time, so deposits can form, especially if they peel off the nozzles can clog and reduce the operability of the burner or no longer allow.
Aufgabe der Erfindung ist es, einen Brenner der eingangs genannten Art bereitzustellen, bei dem die Öl -Verkokung im internen Ölverteilersystem von Vormischbrennern vermieden wird. Die Erfindung löst diese Aufgabe, indem sie vorsieht, dass bei einem derartigen Brenner mit einer zentralen Brennstoffzufuhranordnung, einem die zentrale Brennstoffzufuhranordnung umgebenden Ringluftkanal zur Zuführung von Verbrennungsluft, ersten Brennstoffdüsen zum Eindüsen eines im Wesentlichen gasförmigen Brennstoffs in den Ringluftkanal, wobei die ersten Brennstoffdüsen von einem ersten BrennstoffVerteiler in der Brennstoffzufuhranordnung gespeist werden, und zweiten Brennstoffdüsen zum Eindüsen eines im Wesentlichen flüssigen Brennstoffs in den Ringluftkanal, wobei die zweiten Brenn- stoffdüsen von einem zweiten BrennstoffVerteiler in der The object of the invention is to provide a burner of the type mentioned, in which the Öl -Verkokung is avoided in the internal oil distribution system of premix burners. The invention solves this problem by providing that in such a burner having a central fuel supply arrangement, an annular air duct surrounding the central fuel supply arrangement for supplying combustion air, first fuel nozzles for injecting a substantially gaseous fuel into the annular air duct, wherein the first fuel nozzles of a first fuel distributors in the fuel supply arrangement and second fuel nozzles for injecting a substantially liquid fuel into the annular air channel, the second fuel nozzles being fed from a second fuel distributor in the first fuel distributor
Brennstoffzufuhranordnung gespeist werden, der zweite BrennstoffVerteiler in der zentralen Brennstoffzufuhranordnung durch einen Luftspalt im Wesentlichen vom Rest der zentralen Brennstoffzufuhranordnung thermisch entkoppelt ist, wobei die zweiten Brennstoffdüsen in der zentralen Brennstoffzufuhranordnung am Ringluftkanal angeordnet sind und im Bereich der zweiten Brennstoffdüsen die Luftspalte gegenüber dem Ring- luftkanal geschlossen sind. Fuel supply arrangement are fed, the second fuel distributor in the central fuel supply assembly through an air gap substantially from the rest of the central Fuel supply arrangement is thermally decoupled, wherein the second fuel nozzles are arranged in the central fuel supply arrangement on the annular air channel and in the region of the second fuel nozzles, the air gaps relative to the annular air duct are closed.
Die Erfindung geht von der Erkenntnis aus, dass der für die Öl-Verkokung ursächliche Sauerstoff im Öl nicht restlos entfernt werden kann und Verkokung daher dadurch verhindert oder vermindert werden muss, dass die Wärmezufuhr reduziert wird. The invention is based on the recognition that the oxygen responsible for the oil coking in the oil can not be completely removed and therefore coking must be prevented or reduced by reducing the heat input.
Nach der Erfindung wird deshalb der brennerinterne Ölvertei- ler weitgehend thermisch vom Rest des Brenners abgetrennt, so dass der Ölverteilerkanal nicht einfach nur ein Kanal im Brennerkörper ist, wie in bisherigen Hybrid-Brennern, sondern durch einen umgebenden Luftspalt weitgehend vom Rest des Brenners abgegrenzt ist. According to the invention therefore the burner internal Ölvertei- is largely thermally separated from the rest of the burner, so that the oil distribution channel is not just a channel in the burner body, as in previous hybrid burners, but is largely separated by a surrounding air gap from the rest of the burner ,
Dabei ist wichtig, dass die Luftspalte gegenüber dem Ringka- nal geschlossen, beispielsweise verschweißt sind. Damit wird eine Durchströmung des Luftspalts mit Verdichterendluft verhindert, die ansonsten die isolierende Wirkung des Luftspalts vermindern würde . Die zentrale Brennstoffzufuhranordnung umfasst nicht nur den zweiten BrennstoffVerteiler für die zweiten Brennstoffdüsen zum Eindüsen eines im Wesentlichen flüssigen Brennstoffs, sondern auch die entsprechende BrennstoffZuführung zum zweiten BrennstoffVerteiler . Es ist daher vorteilhaft, wenn auch diese BrennstoffZuführung durch einen Luftspalt im Wesentlichen vom Rest der zentralen Brennstoffzufuhranordnung thermisch entkoppelt ist. It is important that the air gaps are closed, for example welded, in relation to the annular channel. This prevents a flow through the air gap with compressor discharge air, which would otherwise reduce the insulating effect of the air gap. The central fuel supply assembly includes not only the second fuel distributor for the second fuel nozzles for injecting a substantially liquid fuel, but also the corresponding fuel supply to the second fuel distributor. It is therefore advantageous if this fuel supply is also thermally decoupled by an air gap substantially from the rest of the central fuel supply arrangement.
Mit der Erfindung wird der Wärmestrom zum Ölverteilerkanal reduziert, die Aufheizung des Öls verringert und das Verkokungsrisiko gesenkt. Insbesondere für Brennstoffe mit hoher Verkokungsneigung wird die Reduzierung des Wärmeeintrags als notwendige Voraussetzung für einen dauerhaften und störungs- freien Betrieb angesehen. Natürlich können die Vorteile der Erfindung auch für Brennstoffe mit geringer bis moderater Verkokungsneigung genutzt werden. Nachfolgend wird mit Bezug auf die Figur, die schematisch und beispielhaft einen Schnitt durch einen Brenner 1 nach der Erfindung zeigt, das dem Brenner 1 zugrunde liegende Konzept beschrieben . Der erfindungsgemäße Brenner 1, der ggf. in Verbindung mit mehreren gleichartigen Brennern beispielsweise in der Brennkammer einer Gasturbinenanlage eingesetzt werden kann, um- fasst ein inneres Pilotbrennersystem und ein das Pilotbrennersystem konzentrisch umgebendes Hauptbrennersystem. Die Fi- gur zeigt im Wesentlichen das Hauptbrennersystem. Sowohl Pilotbrennersystem als auch Hauptbrennersystem können wahlweise mit gasförmigen und/oder flüssigen Brennstoffen, wie bspw. Erdgas oder Heizöl, betrieben werden. Das Hauptbrennersystem umfasst eine zentrale Brennstoffzu- fuhranordnung 2 und einen diese zentrale Brennstoffzufuhran- ordnung 2 umgebenden Ringluftkanal 3, durch den sich mehrere Drallschaufeln 11 einer Drallbeschaufelung erstrecken. Diese Drallschaufeln 11 weisen erste Brennstoffdüsen 4 auf, durch die Brenngas in die durch den Ringluftkanal 3 einströmendeWith the invention, the heat flow is reduced to the oil distribution channel, reduces the heating of the oil and lowered the coking risk. In particular for fuels with a high coking tendency, the reduction of the heat input is a necessary condition for a permanent and trouble-free combustion. free operation. Of course, the advantages of the invention can also be used for fuels with low to moderate coking tendency. In the following, the concept underlying the burner 1 is described with reference to the figure, which shows schematically and by way of example a section through a burner 1 according to the invention. The burner 1 according to the invention, which can optionally be used in conjunction with a plurality of identical burners, for example in the combustion chamber of a gas turbine plant, comprises an inner pilot burner system and a main burner system concentrically surrounding the pilot burner system. The figure essentially shows the main burner system. Both the pilot burner system and the main burner system may optionally be operated with gaseous and / or liquid fuels, such as natural gas or fuel oil. The main burner system comprises a central fuel supply arrangement 2 and an annular air channel 3 surrounding this central fuel supply arrangement 2, through which a plurality of swirl vanes 11 of a swirl blading extend. These swirl vanes 11 have first fuel nozzles 4, through which fuel gas in the inflowing through the annular air channel 3
Luft 12 eingedüst werden kann. In die durch den Ringluftkanal 3 strömende Luft 12 kann mittels zweiter Brennstoffdüsen 6 zudem Öl (oder andere flüssige Brennstoffe) eingedüst werden. Die in den Drallschaufeln 11 angeordneten ersten Brennstoffdüsen 4, sowie die in der zentralen Brennstoffzufuhranordnung 2 am Ringluftkanal 3 angeordneten zweiten Brennstoffdüsen 6 werden über die zentrale Brennstoffzufuhranordnung 2, die sogenannte Nabe, mit Brennstoff versorgt. In dieser sind erste 5 und zweite Brennstoff erteiler 7 angeordnet, die die ersten Brennstoffdüsen 4 mit gasförmigem und die zweiten Brennstoffdüsen 6 mit flüssigem Brennstoff versorgen. Weiterhin umfasst die zentrale Brennstoffzufuhranordnung 2 Brennstoffzuführun- gen für den ersten 5 und den zweiten Brennstoff erteiler 7. Die Figur zeigt die BrennstoffZuführung 9 für den zweiten BrennstoffVerteiler 7, d.h. die Ölzuführung. Nach der Erfindung ist der zweite BrennstoffVerteiler 7 in der zentralen Brennstoffzufuhranordnung 2 im Wesentlichen vom Rest der zentralen Brennstoffzufuhranordnung 2 durch einen ihn umgebenden Luftspalt 8 thermisch entkoppelt, der im Bereich der zweiten Brennstoffdüsen 6 gegenüber dem Ringluftka- nal 3, beispielsweise durch Verschweißen, geschlossen ist (Abschluss 13 für Luftspalt 8) , um so ein Durchströmen des Luftspalts 8 mit Verdichterendluft 12 zu vermeiden. In der Figur ist neben dem zweiten BrennstoffVerteiler 7 auch die Brennstoffzuführung 9 zum zweiten BrennstoffVerteiler 7 durch einen Luftspalt 10 vom Rest der zentralen Brennstoffzufuhranordnung 2 thermisch entkoppelt. Air 12 can be injected. In addition, oil (or other liquid fuels) can be injected into the air 12 flowing through the annular air channel 3 by means of second fuel nozzles 6. The arranged in the swirl vanes 11 first fuel nozzles 4, as well as arranged in the central fuel supply assembly 2 on the annular air duct 3 second fuel nozzles 6 are supplied via the central fuel supply assembly 2, the so-called hub with fuel. In this first 5 and second fuel distributor 7 are arranged, which supply the first fuel nozzles 4 with gaseous and the second fuel nozzles 6 with liquid fuel. Furthermore, the central fuel supply arrangement 2 comprises fuel feeds. The figure shows the BrennstoffZuführung 9 for the second fuel distributor 7, ie the oil supply. According to the invention, the second fuel distributor 7 in the central fuel supply arrangement 2 is substantially thermally decoupled from the remainder of the central fuel supply arrangement 2 by an air gap 8 surrounding it, which is closed in the region of the second fuel nozzles 6 with respect to the annular air duct 3, for example by welding (End 13 for air gap 8), so as to avoid a flow through the air gap 8 with Verdichterendluft 12. In the figure, in addition to the second fuel distributor 7, the fuel supply 9 to the second fuel distributor 7 is thermally decoupled from the rest of the central fuel supply arrangement 2 by an air gap 10.
Im reinen Gasbetrieb sind der zweite BrennstoffVerteiler 7 und die BrennstoffZuführung 9 frei von Öl . Somit kann es in diesen Bereichen nicht zu einer Verkokung kommen. Im Ölbe- trieb wird die Verkokung nun dadurch vermieden oder zumindest gemindert, dass eine bessere Kühlung des zweiten Brennstoff- Verteilers 7 und der Brennstoffzuführung 9 durch das fließende Öl selbst erfolgt, weil aufgrund der Luftspalte 8, 10 eine geringere Wärmemenge aus dem Ringluftkanal 3 an den zweitenIn pure gas operation, the second fuel distributor 7 and the fuel feed 9 are free of oil. Thus, it can not come to a coking in these areas. In oil operation, the coking is now avoided or at least reduced, that a better cooling of the second fuel distributor 7 and the fuel supply 9 by the flowing oil itself, because due to the air gaps 8, 10 a smaller amount of heat from the annular air duct 3 at the second
BrennstoffVerteiler 7 bzw. die Brennstoffzuführung 9 übertragen wird. BrennstoffVerteiler 7 or the fuel supply 9 is transmitted.

Claims

Brenner (1) mit einer zentralen Brennstoffzufuhranordnung (2), einem die zentrale Brennstoffzufuhranordnung (2) umgebenden Ringluftkanal (3) zur Zuführung von Verbrennungsluft, ersten Brennstoffdüsen (4) zum Eindüsen eines im Wesentlichen gasförmigen Brennstoffs in den Ringluftkanal (3), wobei die ersten Brennstoffdüsen (4) von einem ersten Brennstoffverteiler (5) in der zentralen Brennstoffzufuhranordnung (2) gespeist werden, und zweiten Brennstoffdüsen (6) zum Eindüsen eines im Wesentlichen flüssigen Brennstoffs in den Ringluftkanal (3), wobei die zweiten Brennstoffdüsen (6) von einem zweiten Brennstoffverteiler (7) in der zentralen Brennstoffzufuhranordnung (2) gespeist werden und wobei der zweite BrennstoffVerteiler (7) in der zentralen Brennstoffzufuhranordnung (2) durch einen Luftspalt (8) im Wesentlichen vom Rest der zentralen Brennstoffzufuhranordnung (2) thermisch entkoppelt ist, dadurch gekennzeichnet, dass die zweiten Brennstoffdüsen (6) in der zentralen Brennstoffzufuhranordnung (2) am Ringluftkanal (3) angeordnet sind und im Bereich der zweiten Brennstoffdüsen (6) die Luftspalte (8) gegenüber dem Ringluftkanal (3) geschlossen sind. A burner (1) having a central fuel supply arrangement (2), an annular air duct (3) surrounding the central fuel supply arrangement (2) for supplying combustion air, first fuel nozzles (4) for injecting a substantially gaseous fuel into the annular air duct (3) first fuel nozzles (4) are fed by a first fuel distributor (5) in the central fuel supply assembly (2) and second fuel nozzles (6) for injecting a substantially liquid fuel into the annular air passage (3), the second fuel nozzles (6) of a second fuel distributor (7) in the central fuel supply assembly (2) and wherein the second fuel distributor (7) is thermally decoupled in the central fuel supply assembly (2) through an air gap (8) substantially from the remainder of the central fuel supply assembly (2); characterized in that the second fuel nozzles (6) in the central fuel Feed arrangement (2) are arranged on the annular air channel (3) and in the region of the second fuel nozzles (6), the air gaps (8) relative to the annular air channel (3) are closed.
Brenner (1) nach Anspruch 1, wobei die zentrale Brennstoffzufuhranordnung (2) ferner eine BrennstoffZuführung (9) zum zweiten BrennstoffVerteiler (7) umfasst und die BrennstoffZuführung (9) durch einen Luftspalt (10) im Wesentlichen ebenfalls vom Rest der zentralen Brennstoffzufuhranordnung (2) thermisch entkoppelt ist. Burner (1) according to claim 1, wherein the central fuel supply assembly (2) further comprises a fuel supply (9) to the second fuel distributor (7) and the fuel supply (9) through an air gap (10) substantially also from the rest of the central fuel supply assembly (2 ) is thermally decoupled.
PCT/EP2014/050687 2013-01-25 2014-01-15 Burner having a central fuel-supplying assembly WO2014114535A1 (en)

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EP0580683B1 (en) 1991-04-25 1995-11-08 Siemens Aktiengesellschaft Burner arrangement, especially for gas turbines, for the low-pollutant combustion of coal gas and other fuels
EP1793169A2 (en) * 2005-11-30 2007-06-06 General Electric Company Turbine engine fuel nozzles and methods of assembling the same
EP2230458A1 (en) * 2009-03-17 2010-09-22 Siemens Aktiengesellschaft Burner assembly for fluid fuels and method for producing a burner assembly
EP2236933A1 (en) * 2009-03-17 2010-10-06 Siemens Aktiengesellschaft Burner assembly for fluid fuels and method for producing a burner assembly
US20120198853A1 (en) * 2009-10-13 2012-08-09 Snecma Multipoint injection device for a combustion chamber of a turbine engine

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