EP0900351B1 - Fuel injection method for a stepped gas turbine combustion chamber - Google Patents

Fuel injection method for a stepped gas turbine combustion chamber Download PDF

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Publication number
EP0900351B1
EP0900351B1 EP19970923092 EP97923092A EP0900351B1 EP 0900351 B1 EP0900351 B1 EP 0900351B1 EP 19970923092 EP19970923092 EP 19970923092 EP 97923092 A EP97923092 A EP 97923092A EP 0900351 B1 EP0900351 B1 EP 0900351B1
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EP
European Patent Office
Prior art keywords
fuel
fuel injection
combustion chamber
accordance
control
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EP19970923092
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German (de)
French (fr)
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EP0900351A1 (en
Inventor
F. Richard Emmons
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Rolls Royce Deutschland Ltd and Co KG
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Rolls Royce Deutschland Ltd and Co KG
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    • 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
    • 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 
    • F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
    • 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 
    • F23C2205/00—Pulsating combustion
    • F23C2205/10—Pulsating combustion with pulsating fuel supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86549—Selective reciprocation or rotation

Definitions

  • the invention relates to a method for fuel injection in a staged Gas turbine combustor with separate fuel injectors for each level, with at least one level for certain operating conditions can be switched off by interrupting the fuel supply. Furthermore, the Invention a fuel injection device for performing the invention Fuel injection process. To the known state of the Technology is only referred to WO 95/17632 by way of example.
  • Gas turbine combustion chambers in particular ring combustion chambers from Gas turbines with staged combustion or staged fuel injection work are becoming increasingly important.
  • a pilot combustion chamber and a main combustion chamber are provided, which each form a so-called level.
  • the Pilot combustion chamber has one or more pilot burners as the first stage, which in the preferred application of an annular combustion chamber from an annular arranged fuel injection nozzles exist, also has the second Stage, namely the main combustion chamber, several main burners, too in the form of a plurality of injection nozzles, preferably arranged in a ring again.
  • FIG. 2 A schematic diagram for such a stepped gas turbine combustion chamber shows the attached Fig. 2.
  • These two walls 20, 21 are still of envelope walls 20a, 21a which ultimately also surround the combustion chamber inlet 22a on the left and define the combustion chamber outlet 22b on the right-hand side.
  • pilot burners 26a At lower gas turbine load points, only the pilot burners 26a are operated, which means that the injectors of the main burners 26b are not supplied with fuel.
  • the main burners 26b are operated in addition to the pilot burners 26a, so that their injection nozzles are then supplied with fuel.
  • the pilot combustion chamber 25a which is also operated solely for starting the gas turbine and for starting up in idle mode, is usually operated in the entire operating map of the gas turbine, in particular flight gas turbine, in order to create an ignition source for the main burners 26b, which are only switched on as required .
  • staged combustion is to minimize pollutant emissions, especially NO x . This is achieved in that the respective burner size can be better adapted to the respective power requirement.
  • the combustion temperature should be as low as possible, which can be achieved by targeted air supply (admixing air 28) into the combustion zone.
  • the respective stages namely the pilot burners 26a and the main burners 26b, are designed for special air-fuel ratios. At low load points of the gas turbine, in which only relatively little fuel is burned overall, the air-fuel ratio coming to the main burners 26b would be too high to be able to support a sensible combustion at all. The main burners 26b are therefore only switched on at higher load points of the gas turbine.
  • FIG. 3 According to which strategy the individual burners, namely the pilot burners 26a as well as the main burners 26b are supplied with fuel, is shown in FIG. 3 shown.
  • the total fuel flow is on the abscissa of this diagram plotted for the two burners, on the ordinate the percentage Share of the pilot burner 26a or the main burner 26b in this Sum fuel flow.
  • the corresponding characteristic of the pilot burner 26a is designated by the letter A, that of the main burner 26b with the letter B. It can be seen that with initially only a small total fuel flow, d. H. in the left section of this diagram only the pilot burners 26a are operated so that their share in the total fuel flow Is 100%. With increasing total fuel flow the main burners 26b are now switched on, specifically at the switch-on point Z.
  • At least the stage that can be switched off ie. H. prefers the Main combustion chamber 25b explained above, with pulsed fuel injection operable.
  • the fuel will thus introduced into the combustion chamber virtually clocked, the pulsation frequency are in the range between a single Hz to a few 100 Hz can.
  • This pulsed injection at least theoretically, has one as well pulsed combustion.
  • combustion pulse is a favorable fuel-air ratio adjustable. Because not at least with low fuel quantities more continuously, but only occasionally fuel is injected, can thus when setting favorable fuel-air ratios overall significantly less fuel is injected than with a conventional one continuous injection is possible.
  • connection point Z also no instabilities To be feared, so that on the one hand a smooth transition when switching on the second stage can be achieved and on the other hand actually for each operating point or thrust value a defined amount of fuel in the combustion chamber is introduced regardless of whether it is an increase in thrust or a thrust redemption.
  • the pulsation frequency which should preferably be variable, in a variety set a favorable combustion from operating points can, preferably above the characteristic frequencies of possible combustion chamber vibrations, so that no negative Effects on combustion efficiency or on thrust as well as the generation of noise. Rather, it is always a combustion achievable with a low degree of efficiency, since for every combustion or injection pulse a favorable fuel-air ratio is present. While in the usual continuous fuel injection today the minimum value of the Fuel throughput due to the instability of the combustion lean fuel-air mixture is determined in an inventive pulsed fuel injection for each fuel pulse a larger one Air-fuel ratio realizable, so that through targeted selection of Pulsation frequency even with a significantly lower total fuel supply still a stable combustion or a series of stable combustion impulses is achievable.
  • the pulsation frequency of the discontinuous Fuel injection can be varied in a certain period of time amount of fuel injected to the respective operating point of the To be able to adapt the gas turbine. But it is also desirable to work with everyone Injection pulse, the amount of fuel that can be introduced can vary there are several options for this. For one, at a constant Fuel quantity per unit of time the injection duration can be changed to others can be introduced with a constant injection duration Amount of fuel to be changed. Of course it is also possible to combine these two strategies, as well as additionally the pulsation frequency can be adjusted so that overall by the many possible variations for each operating point of the gas turbine optimal fuel injection can be selected in each case. Be there pointed out that in high-load operating points of course from pulsed injection to continuous fuel injection can be switched.
  • pulsed fuel injection is also to be had pointed out.
  • the pulsation frequency namely the usual combustion frequencies are controlled in such a way that the so-called "combustion hum" that occurs when the combustion is unstable Low fuel flow can occur from the characteristic frequencies resulting from possible combustion chamber vibrations, minimized can be.
  • the first stage or pilot combustion chamber which is usually not in certain Operating states is switched off with a continuous fuel injection can or should work, especially one safe ignition of the fuel-air mixture in the second stage or Main combustion chamber to ensure.
  • An advantageous fuel injection device for performing such pulsed fuel injection can be done from an electromagnetic and / or hydraulically operated fuel injector, the The time and duration of the opening can be specifically adjusted.
  • Such fuel injectors are known from reciprocating internal combustion engines. Such fuel injectors can now be modified accordingly used to either direct the fuel into the combustion chamber to inject a gas turbine or they can be an essentially common one Be upstream fuel injector.
  • Pulsation control valve which is a conventional in the Combustion chamber opening fuel injector is connected upstream.
  • this injection nozzle can have a metering valve be connected upstream, it being particularly advantageous for the pulsation control valve and to combine the dosing valve in one component, which is referred to below as "pulse dosing device”.
  • FIG. 1 A preferred embodiment for such a pulse meter is in Fig. 1 shown in a principle section and is explained in more detail below.
  • Reference number 1 denotes a cylinder of the pulse dispenser described, within which a control piston 2 is rotatable about the cylinder axis 3 and is arranged displaceably in the direction of the cylinder axis 3.
  • a cylinder wall opening 4 leads into the interior of the cylinder 1 Fuel can be introduced according to arrow 18a, via a further control window 5 designated breakthrough in the cylinder wall is fuel from the cylinder interior Removable according to arrow 18b.
  • the cylinder wall opening 4 and the control window 5 are one with the fuel supply system switchable stage of a stepped gas turbine combustion chamber connected, the fuel discharged via the control window 5 (arrow 18b) to the Fuel injection nozzles led to this switchable combustion chamber stage becomes.
  • the control piston 2 is hollow at least in sections, so that there is a piston interior 6, which is only shown in broken lines, in which as can be seen, fuel that flows in accordance with arrow 18a over the wall opening 4 in flowed into the interior of the cylinder 1, can reach. So this piston interior 6, which is designed here in the form of two bores, with is connected to the gas turbine fuel supply system. At the At least one control slot 7 is provided on the outer wall of the control piston 2. the one with the piston interior 6 or with the corresponding bores communicates. This allows fuel to flow through the wall opening 4 is brought out, ultimately exit through the control slot 7.
  • the amount of fuel discharged via the control window 5 can be also by the frequency of rotation of the control piston 2 or control slot 7 are influenced. However, with regard to certain boundary conditions a certain rotation frequency is desired, so this is a preferred setting the amount of fuel delivered per fuel pulse is possible that the control piston 2 along the cylinder axis 3 in or against the direction of the arrow 14 is moved. This allows the effective length I of the control slot 7, via which this comes to cover with the control window 5, to be changed. With a larger value of length I becomes a larger one Amount of fuel discharged through the control window 5, with a smaller one Length I a smaller amount of fuel.
  • the control piston 2 can be set in rotation about the cylinder axis 3 from the gearbox of the gas turbine, but also, for example, from an electric motor, of which only the output pinion 8 is shown, with which a gear 9 meshes, which via a stub shaft 10 with a so-called.
  • Guide extension 11 of the control piston 2 is connected. This leadership process 11 is also guided within the cylinder 1 and has one Front side 12 'on which a hydraulic medium with constant pressure above this guide extension 11 via a control opening 13 'in reaches the interior of the cylinder 1, acts.
  • a comparable one Control opening 13 is located below the control piston 2 in the cylinder 1, see above that also act on this lower end face 12, a hydraulic medium can.
  • this can be as well as a variety of details, particularly constructive Kind of quite different from this shown embodiment be designed without leaving the content of the claims.
  • Essential is rather that in general at least the stage that can be switched off tiered gas turbine combustor with pulsed fuel injection is operable.

Abstract

A gas turbine combustion chamber comprises pilot burners (26a) and main burners (26b), the latter being switched off when the fuel supply is interrupted. In particular to prevent problems during the transition from the mode in which the pilot burners are operating alone to the mode in which both the pilot burners and the main burners are operating, the main burners can be operated with pulsed fuel injection. By varying in a specific manner the pulsation frequency and the amount of fuel introduced with each injection pulse, the main burners can each be operated with the most favourable air-fuel ratio over a wide operating range. The invention further concerns a particularly advantageous pulse-metering device for producing this pulsed fuel injection.

Description

Die Erfindung betrifft ein Verfahren zur Kraftstoff-Einspritzung in eine gestufte Gasturbinen-Brennkammer mit separaten Kraftstoff-Einspritzdüsen für jede Stufe, wobei zumindest eine Stufe für bestimmte Betriebszustände durch Unterbrechung der Kraftstoffzufuhr abschaltbar ist. Ferner betrifft die Erfindung eine Kraftstoffeinspritzvorrichtung zur Durchführung des erfindungsgemäßen Kraftstoff-Einspritzverfahrens. Zum bekannten Stand der Technik wird lediglich beispielshalber auf die WO 95/17632 verwiesen.The invention relates to a method for fuel injection in a staged Gas turbine combustor with separate fuel injectors for each level, with at least one level for certain operating conditions can be switched off by interrupting the fuel supply. Furthermore, the Invention a fuel injection device for performing the invention Fuel injection process. To the known state of the Technology is only referred to WO 95/17632 by way of example.

Im Dokument US-A-3 688 495 wird ein getaktetes Brennstoffventil für eine Gasturbine beschrieben.Document US-A-3 688 495 describes a timed fuel valve for a gas turbine.

Gasturbinen-Brennkammern, insbesondere Ring-Brennkammern von Gasturbinen, die mit gestufter Verbrennung bzw. gestufter Kraftstoff-Einspritzung arbeiten, gewinnen zunehmend an Bedeutung. Üblicherweise ist eine Pilot-Brennkammer sowie eine Haupt-Brennkammer vorgesehen, die jeweils eine sog. Stufe bilden. Selbstverständlich können neben diesen beiden Stufen noch weitere Abstufungen bzw. Stufen vorgesehen sein. Die Pilot-Brennkammer besitzt als erste Stufe einen oder mehrere Pilot-Brenner, die im bevorzugten Anwendungsfall einer Ring-Brennkammer aus ringförmig angeordneten Kraftstoff-Einspritzdüsen bestehen, ebenso besitzt die zweite Stufe, nämlich die Haupt-Brennkammer, mehrere Haupt-Brenner, ebenfalls in Form mehrerer vorzugsweise wieder ringförmig angeordneter Einspritzdüsen.Gas turbine combustion chambers, in particular ring combustion chambers from Gas turbines with staged combustion or staged fuel injection work are becoming increasingly important. Usually is a pilot combustion chamber and a main combustion chamber are provided, which each form a so-called level. Of course, in addition to these two Levels still further gradations or levels may be provided. The Pilot combustion chamber has one or more pilot burners as the first stage, which in the preferred application of an annular combustion chamber from an annular arranged fuel injection nozzles exist, also has the second Stage, namely the main combustion chamber, several main burners, too in the form of a plurality of injection nozzles, preferably arranged in a ring again.

Eine Prinzipdarstellung für eine derartige gestufte Gasturbinen-Brennkammer zeigt die beigefügte Fig. 2. Hier ist die Brennkammer-Außenwand mit der Bezugsziffer 20 und die Brennkammer-Innenwand mit der Bezugsziffer 21 bezeichnet. Diese beiden Wände 20, 21 sind noch von Hüllwänden 20a, 21a umgeben, welche letztlich auch linksseitig den Brennkammer-Eintritt 22a und rechtsseitig den Brennkammer-Austritt 22b definieren. Ferner ist die Mittellinie 23 dieser als Ring-Brennkammer ausgebildeten Gasturbinen-Brennkammer dargestellt.A schematic diagram for such a stepped gas turbine combustion chamber shows the attached Fig. 2. Here is the combustion chamber outer wall with the reference number 20 and the combustion chamber inner wall with the reference number Designated 21. These two walls 20, 21 are still of envelope walls 20a, 21a which ultimately also surround the combustion chamber inlet 22a on the left and define the combustion chamber outlet 22b on the right-hand side. Furthermore, the Center line 23 of this gas turbine combustion chamber designed as an annular combustion chamber shown.

Innerhalb der linken Hälfte dieser Brennkammer ist eine Trennwandstruktur 24 vorgesehen. Zwischen dieser Trennwandstruktur 24 sowie der Mittelachse 23 liegt die sog. Pilot-Brennkammer 25a, während sich unterhalb dieser Trennwandstruktur 24 die sog. Haupt-Brennkammer 25b befindet. Der Pilot-Brennkammer 25a sind Pilot-Brenner 26a zugeordnet, während für die Haupt-Brennkammer 25b Haupt-Brenner 26b vorgesehen sind. Über diese Brenner 26a, 26b wird Kraftstoff bzw. ein Kraftstoff-Luft-Gemisch in die Brennkammern eingeführt, während ein Hauptluftstrom 27 über den Brennkammer-Eintritt 22a in die einzelnen Brennkammern 25a, 25b gelangt. Ferner kann Zumischluft 28 über Durchbrüche in der Außenwand 20, in der Innenwand 21, sowie in der Trennwandstruktur 24 in die einzelnen Brennkammern 25a, 25b eintreten. Das in der Pilot-Brennkammer 25a bzw. in der Haupt-Brennkammer 25b sowie in der Zusammenführung dieser beiden Brennkammern verbrannte Kraftstoff-Luft-Gemisch wird schließlich über den Brennkammer-Austritt 22b abgeführt. There is a partition structure within the left half of this combustion chamber 24 provided. Between this partition structure 24 and the central axis 23 is the so-called pilot combustion chamber 25a, while below the main combustion chamber 25b is located in this partition structure 24. The Pilot burners 25a are associated with pilot burners 26a, while for the Main combustion chamber 25b main burners 26b are provided. About these Burner 26a, 26b is fuel or a fuel-air mixture in the Combustion chambers are introduced while a main airflow 27 is entering the combustion chamber 22a reaches the individual combustion chambers 25a, 25b. Further can admixing air 28 through openings in the outer wall 20 in the Inner wall 21, as well as in the partition structure 24 in the individual combustion chambers 25a, 25b occur. That in the pilot combustion chamber 25a or in the Main combustion chamber 25b and in the combination of these two Combustion chamber burned fuel-air mixture is finally over the Combustion chamber outlet 22b discharged.

In niedrigeren Lastpunkten der Gasturbine werden lediglich die Pilot-Brenner 26a betrieben, was bedeutet, daß die Einspritzdüsen der Haupt-Brenner 26b nicht mit Kraftstoff versorgt werden. In höheren Lastpunkten der Gasturbine werden zusätzlich zu den Pilot-Brennern 26a die Haupt-Brenner 26b betrieben, so daß deren Einspritzdüsen dann mit Kraftstoff versorgt werden. Üblicherweise wird die Pilot-Brennkammer 25a, die auch zum Starten der Gasturbine und zum Hochfahren in den Leerlauf alleinig betrieben wird, im gesamten Betriebskennfeld der Gasturbine, insbesondere Flug-Gasturbine betrieben, um eine Zündquelle für die nur bedarfsweise zugeschalteten Haupt-Brenner 26b zu schaffen. Der Zweck der gestuften Verbrennung liegt in der Minimierung von Schadstoffemissionen, insbesondere von NOx. Erreicht wird dies dadurch, daß die jeweilige Brennergröße besser an den jeweiligen Leistungsbedarf angepaßt werden kann. So sollte zur NOx-Reduzierung die Verbrennungstemperatur möglichst gering sein, was durch gezielte Luftzufuhr (Zumischluft 28) in die Verbrennungszone erreichbar ist. Dabei sind die jeweiligen Stufen, nämlich die Pilot-Brenner 26a bzw. die Haupt-Brenner 26b auf spezielle Luft-Kraftstoff-Verhältnisse hin ausgelegt. Bei niedrigen Lastpunkten der Gasturbine, in denen insgesamt nur relativ wenig Kraftstoff verbrannt wird, wäre das den Haupt-Brennern 26b zukommende Luft-Kraftstoff-Verhältnis zu groß, um überhaupt eine sinnvolle Verbrennung unterstützen zu können. Daher werden die Haupt-Brenner 26b erst in höheren Lastpunkten der Gasturbine zugeschaltet.At lower gas turbine load points, only the pilot burners 26a are operated, which means that the injectors of the main burners 26b are not supplied with fuel. At higher load points of the gas turbine, the main burners 26b are operated in addition to the pilot burners 26a, so that their injection nozzles are then supplied with fuel. The pilot combustion chamber 25a, which is also operated solely for starting the gas turbine and for starting up in idle mode, is usually operated in the entire operating map of the gas turbine, in particular flight gas turbine, in order to create an ignition source for the main burners 26b, which are only switched on as required . The purpose of staged combustion is to minimize pollutant emissions, especially NO x . This is achieved in that the respective burner size can be better adapted to the respective power requirement. In order to reduce NO x, the combustion temperature should be as low as possible, which can be achieved by targeted air supply (admixing air 28) into the combustion zone. The respective stages, namely the pilot burners 26a and the main burners 26b, are designed for special air-fuel ratios. At low load points of the gas turbine, in which only relatively little fuel is burned overall, the air-fuel ratio coming to the main burners 26b would be too high to be able to support a sensible combustion at all. The main burners 26b are therefore only switched on at higher load points of the gas turbine.

Nach welcher Strategie die einzelnen Brenner, nämlich die Pilot-Brenner 26a sowie die Haupt-Brenner 26b hierbei mit Kraftstoff versorgt werden, ist in Fig. 3 dargestellt. Auf der Abszisse dieses Diagrammes ist der Summen-Kraftstoff-Fluß für die beiden Brenner aufgetragen, auf der Ordinate der prozentuale Anteil der Pilot-Brenner 26a bzw. der Haupt-Brenner 26b an diesem Summen-Kraftstoff-Fluß. Die entsprechende Kennlinie des Pilot-Brenners 26a ist mit dem Buchstaben A bezeichnet, diejenige der Haupt-Brenner 26b mit dem Buchstaben B. Man erkennt, daß bei zunächst nur geringem Summen-Kraftstoff-Fluß, d. h. im linken Teilbereich dieses Diagrammes lediglich die Pilot-Brenner 26a betrieben werden, so daß deren Anteil am Summen-Kraftstoff-Fluß 100 % beträgt. Bei zunehmendem Summen-Kraftstoff-Fluß werden nun die Haupt-Brenner 26b zugeschaltet, und zwar im Zuschaltpunkt Z. Hierbei soll jedoch kein schlagartiger Leistungszuwachs erfolgen. Erwünscht ist vielmehr ein sanfter Leistungszuwachs, so daß mit einer zunächst relativ geringen Versorgung der Haupt-Brenner 26b gleichzeitig die Pilot-Brenner 26a mit einer geringeren Kraftstoffmenge versorgt werden. Dieser Zuschaltpunkt Z ist hinsichtlich seiner Auslegung daher äußerst kritisch, da sowohl in den Pilot-Brennern 26a, als auch in den Haupt-Brennern 26b stets ein geeignetes Kraftstoff-Luftverhältnis vorliegen muß. Die gleichen Überlegungen gelten dabei auch bezüglich einer Leistungsrücknahme der Gasturbine, wenn also die zunächst betriebenen Haupt-Brenner 26b wieder abgeschaltet werden. Um Instabilitäten in der direkten Umgebung dieses Zuschaltpunktes Z zu vermeiden, wird in der eingangs genannten WO 95/17632 hierfür eine Steuerung vorgeschlagen, die eine Hysterese enthält. Bei zunehmendem Schub werden die Haupt-Brenner erst bei einem höheren Gesamt-Kraftstoffdurchsatz zugeschaltet, als sie bei abnehmendem Schub abgeschaltet werden.According to which strategy the individual burners, namely the pilot burners 26a as well as the main burners 26b are supplied with fuel, is shown in FIG. 3 shown. The total fuel flow is on the abscissa of this diagram plotted for the two burners, on the ordinate the percentage Share of the pilot burner 26a or the main burner 26b in this Sum fuel flow. The corresponding characteristic of the pilot burner 26a is designated by the letter A, that of the main burner 26b with the letter B. It can be seen that with initially only a small total fuel flow, d. H. in the left section of this diagram only the pilot burners 26a are operated so that their share in the total fuel flow Is 100%. With increasing total fuel flow the main burners 26b are now switched on, specifically at the switch-on point Z. However, there should be no sudden increase in performance. He wishes is rather a gentle increase in performance, so with one at first relatively low supply to the main burner 26b at the same time Pilot burner 26a can be supplied with a smaller amount of fuel. This connection point Z is therefore extremely critical with regard to its design, since both in the pilot burners 26a and in the main burners 26b, there must always be a suitable air-fuel ratio. The same Considerations also apply to a withdrawal of benefits from the Gas turbine, if the main burners 26b that were initially operated again be switched off. To instabilities in the immediate vicinity of this Avoiding connection point Z is described in the aforementioned WO 95/17632 proposed a controller for this purpose which contains a hysteresis. With increasing thrust, the main burners only become at a higher one Total fuel flow switched on as they decrease as the thrust be switched off.

Da es jedoch erwünscht ist, in einem definierten Lastpunkt bzw. Schubzustand der Gasturbine stets auch einen definierten Kraftstoffdurchsatz zu haben - d. h. unabhängig davon, ob es sich um eine Schubzunahme oder um eine Schubrücknahme handelt -, hat sich die Erfindung die Aufgabe gestellt, eine andere Lösung für die oben geschilderte Problematik im Zusammenhang mit dem Zuschalten einer zweiten Stufe zu einer ersten Stufe aufzuzeigen.
Gelöst wird diese Aufgabe dadurch, daß zumindest die abschaltbare Stufe mit gepulster Kraftstoff-Einspritzung betreibbar ist. Geeignete Kraftstoffeinspritzvorrichtungen zur Durchführung dieses erfindungsgemäßen Kraftstoff-Einspritzverfahrens sind in den Ansprüchen 5 und 6 beschrieben, während die weiteren Unteransprüche vorteilhafte Aus- und Weiterbildungen zum Inhalt haben.However, since it is desirable to always have a defined fuel throughput in a defined load point or overrun condition of the gas turbine - ie regardless of whether it is an increase in overrun or a decrease in overrun - the invention has the task of another To show the solution to the problem described above in connection with the connection of a second stage to a first stage.
This object is achieved in that at least the stage which can be switched off can be operated with pulsed fuel injection. Suitable fuel injection devices for carrying out this fuel injection method according to the invention are described in claims 5 and 6, while the further subclaims contain advantageous training and further developments.

Erfindungsgemäß ist zumindest die abschaltbare Stufe, d. h. bevorzugt die oben erläuterte Haupt-Brennkammer 25b, mit gepulster Kraftstoff-Einspritzung betreibbar. Dies bedeutet, daß dann keine kontinuierliche, sondern eine diskontinuierliche Kraftstoff-Einspritzung erfolgt. Der Kraftstoff wird somit quasi getaktet in die Brennkammer eingeführt, wobei die Pulsationsfrequenz im Bereich zwischen einzigen Hz bis zu einigen 100 Hz liegen kann. Diese gepulste Einspritzung hat zumindest theoretisch eine ebenso gepulste Verbrennung zur Folge. Für jeden Einspritzimpuls bzw. für jeden sog. Verbrennungs-Impuls ist dabei ein günstiges Kraftstoff-Luft-Verhältnis einstellbar. Dadurch, daß zumindest bei niedrigen Kraftstoffmengen nicht mehr kontinuierlich, sondern nurmehr zeitweise Kraftstoff eingespritzt wird, kann somit bei Einstellung günstiger Kraftstoff-Luft-Verhältnisse insgesamt deutlich weniger Kraftstoff eingespritzt werden, als dies bei einer herkömmlichen kontinuierlichen Einspritzung möglich ist. Insbesondere sind aufgrund der gepulsten Einspritzung im sog. Zuschaltpunkt Z auch keine Instabilitäten zu befürchten, so daß zum einen ein weicher Übergang beim Zuschalten der zweiten Stufe erzielbar ist und zum anderen tatsächlich für jeden Betriebspunkt bzw. Schubwert eine definierte Kraftstoffmenge in die Brennkammer eingeführt wird, unabhängig davon, ob es sich nun um eine Schubzunahme oder um eine Schubrücknahme handelt. According to the invention, at least the stage that can be switched off, ie. H. prefers the Main combustion chamber 25b explained above, with pulsed fuel injection operable. This means that then no continuous, but discontinuous fuel injection takes place. The fuel will thus introduced into the combustion chamber virtually clocked, the pulsation frequency are in the range between a single Hz to a few 100 Hz can. This pulsed injection, at least theoretically, has one as well pulsed combustion. For every injection pulse or for everyone So-called combustion pulse is a favorable fuel-air ratio adjustable. Because not at least with low fuel quantities more continuously, but only occasionally fuel is injected, can thus when setting favorable fuel-air ratios overall significantly less fuel is injected than with a conventional one continuous injection is possible. In particular are due the pulsed injection in the so-called connection point Z also no instabilities To be feared, so that on the one hand a smooth transition when switching on the second stage can be achieved and on the other hand actually for each operating point or thrust value a defined amount of fuel in the combustion chamber is introduced regardless of whether it is an increase in thrust or a thrust redemption.

Die Pulsationsfrequenz, die bevorzugt variierbar sein soll, um in einer Vielzahl von Betriebspunkten eine jeweils günstige Verbrennung einstellen zu können, kann bevorzugt oberhalb der charakteristischen Frequenzen von möglichen Brennkammer-Schwingungen liegen, so daß keine negativen Auswirkungen auf den Verbrennungswirkungsgrad bzw. auf den Schub sowie die Lärmerzeugung zu befürchten sind. Vielmehr ist stets eine Verbrennung mit einem günstigen Wirkungsgrad erreichbar, da für jeden Verbrennungs- bzw. Einspritzimpuls ein günstiges Kraftstoff-Luft-Verhältnis vorliegt. Während bei der heute üblichen kontinuierlichen Kraftstoff-Einspritzung in die (abschaltbare) Hauptbrennkammer der Minimalwert des Kraftstoffdurchsatzes durch die Instabilität der Verbrennung durch ein zu mageres Kraftstoff-Luft-Gemisch bestimmt ist, ist bei einer erfindungsgemäßen gepulsten Kraftstoff-Einspritzung für jeden Kraftstoffimpuls ein größeres Kraftstoff-Luft-Verhältnis realisierbar, so daß durch gezielte Auswahl der Pulsationsfrequenz auch bei deutlich geringerer Kraftstoff-Summenzufuhr noch eine stabile Verbrennung bzw. eine Reihe von stabilen Verbrennungs-Impulsen erzielbar ist.The pulsation frequency, which should preferably be variable, in a variety set a favorable combustion from operating points can, preferably above the characteristic frequencies of possible combustion chamber vibrations, so that no negative Effects on combustion efficiency or on thrust as well as the generation of noise. Rather, it is always a combustion achievable with a low degree of efficiency, since for every combustion or injection pulse a favorable fuel-air ratio is present. While in the usual continuous fuel injection today the minimum value of the Fuel throughput due to the instability of the combustion lean fuel-air mixture is determined in an inventive pulsed fuel injection for each fuel pulse a larger one Air-fuel ratio realizable, so that through targeted selection of Pulsation frequency even with a significantly lower total fuel supply still a stable combustion or a series of stable combustion impulses is achievable.

Wie bereits erläutert, kann die Pulsationsfrequenz der diskontinuierlichen Kraftstoff-Einspritzung variiert werden, um die in einer gewissen Zeitspanne eingespritzte Kraftstoff-Summenmenge an den jeweiligen Betriebspunkt der Gasturbine anpassen zu können. Es ist aber auch erwünscht, die mit jedem Einspritz-Impuls einbringbare Kraftstoffmenge variieren zu können, wobei hierfür mehrere Möglichkeiten existieren. Zum einen kann bei einer konstanten Kraftstoffmenge je Zeiteinheit die Einspritzdauer geändert werden, zum anderen kann bei einer konstanten Einspritzdauer die hierbei eingebrachte Kraftstoffmenge verändert werden. Selbstverständlich ist es auch möglich, diese beiden Strategien miteinander zu kombinieren, ebenfalls wie zusätzlich die Pulsationsfrequenz angepaßt werden kann, so daß insgesamt durch die vielen Variationsmöglichkeiten für jeden Betriebspunkt der Gasturbine die jeweils optimale Kraftstoff-Einspritzung gewählt werden kann. Dabei sei darauf hingewiesen, daß in Hochlast-Betriebspunkten selbstverständlich von der gepulsten Einspritzung auf eine kontinuierliche Kraftstoff-Einspritzung umgeschaltet werden kann.As already explained, the pulsation frequency of the discontinuous Fuel injection can be varied in a certain period of time amount of fuel injected to the respective operating point of the To be able to adapt the gas turbine. But it is also desirable to work with everyone Injection pulse, the amount of fuel that can be introduced can vary there are several options for this. For one, at a constant Fuel quantity per unit of time the injection duration can be changed to others can be introduced with a constant injection duration Amount of fuel to be changed. Of course it is also possible to combine these two strategies, as well as additionally the pulsation frequency can be adjusted so that overall by the many possible variations for each operating point of the gas turbine optimal fuel injection can be selected in each case. Be there pointed out that in high-load operating points of course from pulsed injection to continuous fuel injection can be switched.

Ferner sei noch auf einen weiteren Vorteil der gepulsten Kraftstoff-Einspritzung hingewiesen. Durch gezielte Auswahl der Pulsationsfrequenz können nämlich die üblichen Verbrennungsfrequenzen derart gesteuert werden, daß das sog. "Verbrennungs-Brummen", das bei instabiler Verbrennung bei geringem Kraftstoffdurchsatz auftreten kann aus den charakteristischen Frequenzen von möglichen Brennkammer-Schwingungen resultiert, minimiert werden kann. Im übrigen sei noch darauf hingewiesen, daß bevorzugt die erste Stufe oder Pilotbrennkammer, welche üblicherweise nicht in bestimmten Betriebszuständen abgeschaltet wird, mit einer kontinuierlichen Kraftstoff-Einspritzung arbeiten kann bzw. sollte, insbesondere auch um eine sichere Zündung des Brennstoff-Luft-Gemisches in der zweiten Stufe oder Hauptbrennkammer zu gewährleisten.Another advantage of pulsed fuel injection is also to be had pointed out. By specifically selecting the pulsation frequency namely the usual combustion frequencies are controlled in such a way that the so-called "combustion hum" that occurs when the combustion is unstable Low fuel flow can occur from the characteristic frequencies resulting from possible combustion chamber vibrations, minimized can be. Furthermore, it should be pointed out that the first stage or pilot combustion chamber, which is usually not in certain Operating states is switched off with a continuous fuel injection can or should work, especially one safe ignition of the fuel-air mixture in the second stage or Main combustion chamber to ensure.

Eine vorteilhafte Kraftstoffeinspritzvorrichtung zur Durchführung einer derartigen gepulsten Kraftstoff-Einspritzung kann aus einem elektromagnetisch und/oder hydraulisch betätigten Kraftstoff-Einspritzventil bestehen, dessen Öffnungszeitpunkt und Öffnungsdauer gezielt einstellbar ist. Derartige Kraftstoff-Einspritzventile sind von Hubkolben-Brennkraftmaschinen her bekannt. Entsprechend abgewandelt können derartige Kraftstoff-Einspritzventile nun dazu verwendet werden, entweder direkt den Kraftstoff in die Brennkammer einer Gasturbine einzuspritzen oder sie können einer im wesentlichen üblichen Kraftstoff-Einspritzdüse vorgeschaltet sein. An advantageous fuel injection device for performing such pulsed fuel injection can be done from an electromagnetic and / or hydraulically operated fuel injector, the The time and duration of the opening can be specifically adjusted. Such fuel injectors are known from reciprocating internal combustion engines. Such fuel injectors can now be modified accordingly used to either direct the fuel into the combustion chamber to inject a gas turbine or they can be an essentially common one Be upstream fuel injector.

Eine weitere Kraftstoff-Einspritzvorrichtung zur Durchführung einer erfindungsgemäßen gepulsten Kraftstoff-Einspritzung kann aus einem geeigneten Pulsations-Steuerventil bestehen, das einer an sich üblichen, in der Brennkammer mündenden Kraftstoff-Einspritzdüse vorgeschaltet ist. Zusätzlich zum Pulsations-Steuerventil kann dieser Einspritzdüse ein Dosierventil vorgeschaltet sein, wobei es besonders vorteilhaft ist, das Pulsations-Steuerventil sowie das Dosierventil in einem Bauelement zusammenzufassen, welches im folgenden als "Puls-Dosierer" bezeichnet wird.Another fuel injection device for carrying out an inventive pulsed fuel injection can be made from a suitable Pulsation control valve exist, which is a conventional in the Combustion chamber opening fuel injector is connected upstream. In addition to the pulsation control valve, this injection nozzle can have a metering valve be connected upstream, it being particularly advantageous for the pulsation control valve and to combine the dosing valve in one component, which is referred to below as "pulse dosing device".

Ein bevorzugtes Ausführungsbeispiel für einen derartigen Puls-Dosierer ist in Fig. 1 in einem Prinzipschnitt dargestellt und wird im folgenden näher erläutert.A preferred embodiment for such a pulse meter is in Fig. 1 shown in a principle section and is explained in more detail below.

Mit der Bezugsziffer 1 ist ein Zylinder des beschriebenen Puls-Dosierers bezeichnet, innerhalb dessen ein Steuerkolben 2 um die Zylinderachse 3 verdrehbar sowie in Richtung der Zylinderachse 3 verschiebbar angeordnet ist. Über einen Zylinder-Wanddurchbruch 4 ist in den Innenraum des Zylinders 1 Kraftstoff gemäß Pfeil 18a einleitbar, über einen weiteren als Steuerfenster 5 bezeichneten Durchbruch in der Zylinderwand ist Kraftstoff aus dem Zylinder-Innenraum gemäß Pfeil 18b abführbar. Der Zylinder-Wanddurchbruch 4 sowie das Steuerfenster 5 sind mit dem Kraftstoff-Versorgungssystem einer abschaltbaren Stufe einer gestuften Gasturbinen-Brennkammer verbunden, wobei der über das Steuerfenster 5 abgeführte Kraftstoff (Pfeil 18b) zu den Kraftstoff-Einspritzdüsen dieser abschaltbaren Brennkammer-Stufe hingeführt wird.Reference number 1 denotes a cylinder of the pulse dispenser described, within which a control piston 2 is rotatable about the cylinder axis 3 and is arranged displaceably in the direction of the cylinder axis 3. A cylinder wall opening 4 leads into the interior of the cylinder 1 Fuel can be introduced according to arrow 18a, via a further control window 5 designated breakthrough in the cylinder wall is fuel from the cylinder interior Removable according to arrow 18b. The cylinder wall opening 4 and the control window 5 are one with the fuel supply system switchable stage of a stepped gas turbine combustion chamber connected, the fuel discharged via the control window 5 (arrow 18b) to the Fuel injection nozzles led to this switchable combustion chamber stage becomes.

Der Steuerkolben 2 ist zumindest abschnittsweise hohl ausgebildet, so daß ein lediglich gestrichelt dargestellter Kolben-Innenraum 6 vorliegt, in welchen wie ersichtlich Kraftstoff, der gemäß Pfeil 18a über den Wanddurchbruch 4 in das Innere des Zylinders 1 einströmte, gelangen kann. Somit ist dieser Kolben-Innenraum 6, der hier in Form zweier Bohrungen ausgebildet ist, mit dem Kraftstoffversorgungssystem der Gasturbine verbunden ist. An der Außenwand des Steuerkolbens 2 ist zumindest ein Steuerschlitz 7 vorgesehen, der mit dem Kolben-Innenraum 6 bzw. mit den entsprechenden Bohrungen in Verbindung steht. Somit kann Kraftstoff, der über den Wanddurchbruch 4 herangeführt wird, letztlich über den Steuerschlitz 7 austreten.The control piston 2 is hollow at least in sections, so that there is a piston interior 6, which is only shown in broken lines, in which as can be seen, fuel that flows in accordance with arrow 18a over the wall opening 4 in flowed into the interior of the cylinder 1, can reach. So this piston interior 6, which is designed here in the form of two bores, with is connected to the gas turbine fuel supply system. At the At least one control slot 7 is provided on the outer wall of the control piston 2. the one with the piston interior 6 or with the corresponding bores communicates. This allows fuel to flow through the wall opening 4 is brought out, ultimately exit through the control slot 7.

Etwa in Höhe des Steuerschlitzes 7 befindet sich in der Wand des Zylinders 1 das bereits erläuterte Steuerfenster 5. Wird nun der Steuerkolben 2 um die Zylinderachse 3 kontinuierlich gedreht, so wird über das Steuerfenster 5 Kraftstoff, der über den Wanddurchbruch 4 herangeführt wurde, gepulst abgeführt. Jedesmal, wenn der Steuerschlitz 7 bei Rotation des Steuerkolbens 2 mit dem Steuerfenster 5 zur Deckung kommt, kann nämlich eine Kraftstoffteilmenge gemäß Pfeil 18b durch das Steuerfenster 5 austreten und letztlich zur Kraftstoff-Einspritzdüse der Brennkammer-Stufe gelangen. Sobald jedoch der rotierende Steuerschlitz 7 das Steuerfenster 5 passiert hat, wird dieser Kraftstoff-Fluß wieder unterbrochen. Allein durch Rotation des Steuerkolbens 2 im Zylinder 1 ist somit eine gepulste Kraftstoff-Einspritzung in eine Gasturbinen-Brennkammer-Stufe erzielbar. Dabei ist die Pulsationsfrequenz durch die Drehgeschwindigkeit des Steuerkolbens 2 im Zylinder 1 vorgegeben, so daß mit gezielter Auswahl der Drehgeschwindigkeit eine bestimmte Pulsationsfrequenz einstellbar ist.Approximately at the level of the control slot 7 is in the wall of the cylinder 1 the control window 5 already explained. If the control piston 2 is moved around the Cylinder axis 3 is rotated continuously, so the control window 5 Fuel that was brought up through the wall opening 4 was discharged in a pulsed manner. Every time the control slot 7 when the control piston rotates 2 with the control window 5 is congruent, namely a partial fuel quantity exit through control window 5 according to arrow 18b and ultimately get to the fuel injector of the combustion chamber stage. However, as soon as the rotating control slot 7 has passed the control window 5 this fuel flow is interrupted again. Just by rotating the Control piston 2 in cylinder 1 is thus a pulsed fuel injection achievable in a gas turbine combustor stage. Here is the pulsation frequency by the speed of rotation of the control piston 2 in the cylinder 1 given so that with targeted selection of the rotational speed a certain pulsation frequency is adjustable.

Die Menge des über das Steuerfenster 5 abgeführten Kraftstoffes kann zwar auch durch die Rotationsfrequenz des Steuerkolbens 2 bzw. Steuerschlitzes 7 beeinflußt werden. Ist jedoch im Hinblick auf gewisse Randbedingungen eine gewisse Rotationsfrequenz erwünscht, so ist eine bevorzugte Einstellung der je Kraftstoff-Impuls abgegebenen Kraftstoffmenge dadurch möglich, daß der Steuerkolben 2 längs der Zylinderachse 3 in bzw. gegen Pfeilrichtung 14 verschoben wird. Hierdurch kann die wirksame Länge I des Steuerschlitzes 7, über welche dieser mit dem Steuerfenster 5 zur Deckung kommt, verändert werden. Bei einem größeren Wert der Länge I wird eine größere Menge Kraftstoff über das Steuerfenster 5 abgeführt, bei einer kleineren Länge I eine geringere Kraftstoffmenge.The amount of fuel discharged via the control window 5 can be also by the frequency of rotation of the control piston 2 or control slot 7 are influenced. However, with regard to certain boundary conditions a certain rotation frequency is desired, so this is a preferred setting the amount of fuel delivered per fuel pulse is possible that the control piston 2 along the cylinder axis 3 in or against the direction of the arrow 14 is moved. This allows the effective length I of the control slot 7, via which this comes to cover with the control window 5, to be changed. With a larger value of length I becomes a larger one Amount of fuel discharged through the control window 5, with a smaller one Length I a smaller amount of fuel.

In Rotation um die Zylinderachse 3 versetzt werden kann der Steuerkolben 2 von der gearbox der Gasturbine, aber auch beispielsweise von einem Elektromotor, von dem lediglich das Abtriebsritzel 8 dargestellt ist, mit welchem ein Getrieberad 9 kämmt, das über einen Achsstummel 10 mit einem sog. Führungsfortsatz 11 des Steuerkolbens 2 verbunden ist. Dieser Führungsfortsatz 11 ist ebenfalls innerhalb des Zylinders 1 geführt und weist eine Stirnseite 12' auf, auf die mit konstantem Druck ein Hydraulikmedium, welches oberhalb dieses Führungsfortsatzes 11 über eine Steueröffnung 13' in den Innenraum des Zylinders 1 gelangt, einwirkt. Eine vergleichbare Steueröffnung 13 findet sich unterhalb des Steuerkolbens 2 im Zylinder 1, so daß auch auf diese untere Stirnseite 12 ein Hydraulikmedium einwirken kann. Wird nun der Hydraulikdruck in der Steueröffnung 13 gegenüber demjenigen in der Steueröffnung 13' erhöht, so wird der Steuerkolben 2 gemäß Pfeilrichtung 14 nach oben verschoben. Eine Erniedrigung des Druckes in der Steueröffnung 13 gegenüber demjenigen in der Steueröffnung 13' hingegen bewirkt eine Verschiebung des Steuerkolbens gegen Pfeilrichtung 14 nach unten. Diese beschriebene Verschiebebewegung in bzw. gegen Pfeilrichtung 14 kann im übrigen auch das Getrieberad 9 bezüglich des Abtriebsritzels 8 durchführen, da letzteres deutlich breiter ausgebildet ist, als das Getrieberad 9. The control piston 2 can be set in rotation about the cylinder axis 3 from the gearbox of the gas turbine, but also, for example, from an electric motor, of which only the output pinion 8 is shown, with which a gear 9 meshes, which via a stub shaft 10 with a so-called. Guide extension 11 of the control piston 2 is connected. This leadership process 11 is also guided within the cylinder 1 and has one Front side 12 'on which a hydraulic medium with constant pressure above this guide extension 11 via a control opening 13 'in reaches the interior of the cylinder 1, acts. A comparable one Control opening 13 is located below the control piston 2 in the cylinder 1, see above that also act on this lower end face 12, a hydraulic medium can. The hydraulic pressure in the control opening 13 is now compared the one in the control opening 13 ', the control piston 2 moved upwards according to arrow direction 14. A humiliation of the Pressure in the control opening 13 compared to that in the control opening 13 ', on the other hand, brings about a displacement of the control piston Arrow direction 14 down. This described displacement movement in or against the direction of the arrow 14, the gear wheel 9 can also relate perform the output pinion 8, since the latter is significantly wider is when the gear 9.

Vorgesehen ist ferner ein über eine Stellstange 15a sowie über einen Federteller 15b auf den Steuerkolben 2 einwirkendes Federelement 16, wobei zusätzlich eine Einstellschraube 17 vorgesehen ist, die ebenfalls auf den Federteller 15b einwirken kann, derart, daß er maximale Kraftstoffdurchfluß über den Steuerschlitz 7 sowie das Steuerfenster 5 eingestellt werden kann. Jedoch kann dies sowie eine Vielzahl von Details, insbesondere konstruktiver Art durchaus abweichend von diesem gezeigten Ausführungsbeispiel gestaltet sein, ohne den Inhalt der Patentansprüche zu verlassen. Wesentlich ist vielmehr, daß ganz allgemein zumindest die abschaltbare Stufe einer gestuften Gasturbinen-Brennkammer mit gepulster Kraftstoff-Einspritzung betreibbar ist.Also provided is an adjusting rod 15a and a spring plate 15b acting on the control piston 2 spring element 16, with additional an adjusting screw 17 is provided, which is also on the spring plate 15b can act such that it has maximum fuel flow can be set via the control slot 7 and the control window 5. However, this can be as well as a variety of details, particularly constructive Kind of quite different from this shown embodiment be designed without leaving the content of the claims. Essential is rather that in general at least the stage that can be switched off tiered gas turbine combustor with pulsed fuel injection is operable.

Claims (9)

  1. Method for fuel injection into a staged gas-turbine combustion chamber with separate fuel injectors for each stage, where at least one is deactivatable for certain operating conditions by interruption of the fuel supply, characterized in that at least the deactivatable stage is operable with pulsed fuel injection.
  2. Method in accordance with Claim 1, characterized in that the pulsation frequency of the discontinuous fuel injection is variable.
  3. Method in accordance with Claim 1 or 2, characterized in that the fuel quantity deliverable with each injection pulse is variable.
  4. Method in accordance with one of the preceding claims, characterized in that a switch-over can be made from discontinuous, pulsed fuel injection to continuous fuel injection.
  5. Fuel injection device for implementation of the method in accordance with one of the Claims 1 to 4, characterized in that an electromagnetically and/or hydraulically operated fuel injector is used whose opening time and opening duration can be positively set.
  6. Fuel injection device for implementation of the method in accordance with one of the Claims 1 to 4, characterized in that a pulsation control valve and/or a metering valve is arranged upstream of the fuel injector extending into the combustion chamber.
  7. Fuel injection device in accordance with Claim 6, characterized in that the pulsation control valve and the metering valve are combined into one unit referred to as pulsing-metering unit.
  8. Fuel injection device in accordance with Claim 7, characterized in that the pulsing-metering unit features a control piston (2) which is rotatable in a cylinder (1) and which is movable in the direction of the cylinder axis (3), with the outer wall of the control piston (2) featuring a control slit (7) connecting to the piston interior (6) and with the piston interior (6) connecting to the fuel supply system of the combustion chamber, said control slit (7) being settable coincidentally with a control window (5) in the cylinder (1) which also connects to the fuel supply system.
  9. Fuel injection device in accordance with Claim 8 characterized by at least one of the following features:
    the rotation of the control piston (2) is effected by an electric motor or by the gearbox of the gas turbine,
    the control piston (2) is positioned in the direction of the cylinder axis (3) by hydraulic pressure applied to a least one of its faces (12, 12').
EP19970923092 1996-05-23 1997-05-15 Fuel injection method for a stepped gas turbine combustion chamber Expired - Lifetime EP0900351B1 (en)

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DE19620874 1996-05-23
DE1996120874 DE19620874A1 (en) 1996-05-23 1996-05-23 Fuel injection for a staged gas turbine combustor
PCT/EP1997/002511 WO1997044622A1 (en) 1996-05-23 1997-05-15 Fuel injection method for a stepped gas turbine combustion chamber

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ES2165057T3 (en) 2002-03-01
WO1997044622A1 (en) 1997-11-27
DE59706046D1 (en) 2002-02-21
US20010027639A1 (en) 2001-10-11
US6381947B2 (en) 2002-05-07
EP0900351A1 (en) 1999-03-10
DE19620874A1 (en) 1997-11-27

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