WO2016000994A1

WO2016000994A1 - Method and device for purging and/or sealing at least one burner of a gas turbine installation

Info

Publication number: WO2016000994A1
Application number: PCT/EP2015/063962
Authority: WO
Inventors: Andreas Waruschewski; Ismail BELKAHLA; Volker Ertle; Kirjiakos GALANAKIS; Gülsen SCHYMETZKO; James Smith; Patrick WÜNSCHE
Original assignee: Siemens Aktiengesellschaft
Priority date: 2014-07-02
Filing date: 2015-06-22
Publication date: 2016-01-07
Also published as: DE102014212826A1

Abstract

The invention relates to a purging and/or sealing device for drawing compressor air from a compressor (1) of a gas turbine installation and for feeding the drawn compressor air as purging and/or sealing air to at least one burner (9-1,..., 9-x) of the gas turbine installation. The purging and/or sealing device comprises: a fluid line (17) extending between the compressor (1) and the at least one burner (9-1,..., 9-x) for feeding compressor air as purging and/or sealing air to the at least one burner (9-1,..., 9-x), a cooler (19), which is arranged in the fluid line (17) and through which the purging and/or sealing air flows, and at least one pressure booster (21), which is arranged in the fluid line (17) and through which purging and/or sealing air flows.

Description

description

Method and device for flushing and / or blocking at least one burner of a gas turbine plant

The present invention relates to a rinsing and / or blocking ^¬ device for supplying rinsing and / or sealing air to at least one burner of a gas turbine plant. Moreover, the invention relates to a gas turbine plant and a method for purging and / or blocking at least one burner of a gas turbine plant.

Gas turbine plants often have multiple burner stages, each burner stage can be individually supplied with fuel. Different burner stages can be realized by different fuel nozzles in a burner, or by the fact that each burner stage wenigs ^¬ least associated with its own burner. Depending on the load of the gas turbine plant, different burner stages are in operation. For example, at partial load or when starting or Abfah ^¬ ren a gas turbine plant typically not all burner stages are in operation. Located not in operation Bren be ^¬ nerstufen usually locked to prevent the entry of hot ^¬ SSSR combustion gases from the combustion chamber to the burner stage. If the burner sections were previously in operation, they are also flushed to remove residual fuel from the previous operation in the fuel supply system and the burners. The object of the present invention is to provide an advantageous flushing and / or locking device for supplying a rinsing and / or barrier fluid to at least a burner of a gas ^turbine installation are available. Another object of the present invention is to provide an advantageous gas turbine plant. Yet another object of the present invention is to provide an advantageous method for purging and / or shutting off at least one burner of a gas turbine plant.

The first object is achieved by a flushing and / or Sperrvor ^¬ direction according to claim 1, the second object by ei ^¬ ne gas turbine plant according to claim 9. The third object is according to claim 10 by a method for supplying rinsing and / or sealing air to at least one burner a wenigs ^¬ least a burner and a compressor comprising gas turbine plant solved. The dependent claims contain advantageous embodiments of the invention ^¬.

According to a first aspect of the invention, a rinsing and / or blocking device for taking compressor air from a compressor is provided to a gas turbine plant and for supplying the extracted compressor air as rinsing and / or blocking air to at least one burner of the gas turbine plant. The rinsing and / or locking device includes a is arranged a burner, egg ^¬ nen in the fluid line between the compressor and the at least one burner extending fluid conduit for supplying compressor discharge air as a rinsing and / or sealing air to the at least and of the flushing and / or blocking air flowed through cooler and at least ei ^¬ NEN arranged in the fluid line and flowed through by the rinsing and / or sealing air pressure booster, also called booster. The present invention makes it possible, in all operating states of a gas turbine plant, to use compressor air as flushing and / or blocking air for blocking burners of the gas turbine plant. A possible associated with the pressure increase heating of the compressor air can be compensated with the help of the cooler. The combination of radiator and

Pressure booster therefore makes it possible, in all operating conditions, to supply the burner with flushing and / or blocking air

Compressor air to a suitable temperature and a suitable Neten pressure to bring. Balancing a temperature increase with the aid of the cooler thereby offers the possibility of keeping the compressor air at the temperature level which it has when tapping off the compressor. At this temperature level, thermal shocks can be avoided during the transition from normal burner operation to purge and / or reverse operation of a burner.

In a specific embodiment of the flushing and / or blocking device, the cooler is located in the fluid line between the compressor and the at least one burner. The booster is then located between the radiator and the at least one burner. In a further development of the rinsing and / or blocking device according to the invention, at least one second pressure booster is arranged in the fluid line. In this case, the first Druckhö ^¬ forth can be arranged in particular in a first flow path of the Fluidlei ^¬ tion and the second booster in a parallel to the first flow path second flow path of the

Fluid line. Due to the parallel arrangement of the pressure booster, the mass flow of compressor air, the pressure of which is increased in order to use it as rinsing and / or blocking air, can be increased.

In the flushing and / or locking device according to the invention, a first shut-off valve may be present, which is located in the fluid line between the radiator and the at least one pressure booster. With the help of this shut-off valve, the compressor air can be separated from the pressure booster and thus any leaks can be prevented.

In order to be able to discharge pressure from the section of the fluid line located between the at least one pressure booster and the at least one burner, for example because a new operating state requires a lower pressure, it is advantageous if a branch fluid line is present which does not lead to the at least one burner where the branch fluid line branches off from a branch point of the fluid line, which is located in the fluid line between the at least one booster and the at least one burner. A second shut-off valve may also be present in this branch fluid line.

In particular, frequency-controlled pressure intensifiers can be used as pressure intensifiers in the flushing and / or blocking device according to the invention.

According to a further aspect of the invention, a Gasturbi ^¬ nena laminated with rinsing invention and / or blocking device is provided. This can be in the gas turbine plant in all operating states compressor air as a rinsing and / or sealing air use, as ^¬ be written with reference to the inventive flushing and / or locking device has been.

In the inventive method for feeding rinsing and / or sealing air to at least a burner of a Wenig ^¬ least a burner and a compressor comprising gas turbine plant the compressor compressor air is taken out and supplied as a rinsing and / or sealing air to the at least a burner of the gas turbine plant. The compressor air is cooled after removal from the compressor and before the supply to the at least one burner and subjected to an increase in pressure. As has already been described above, by cooling and increasing the pressure of the withdrawn

Compressor air these find in any operating condition of the gas turbine plant as flushing and / or sealing air use.

In an advantageous embodiment of the method according to the invention, the compressor air is first cooled and then subjected to an increase in pressure. In this way, it is avoided that the cooler is flowed through by the pressurized air under increased pressure, so that the cooler need not be designed for the increased pressures. Further features, properties and advantages of the present invention will become apparent from the following description of embodiments with reference to the accompanying figures.

1 shows a gas turbine plant in a highly overbased schemati ^¬ representation.

2 shows a gas turbine plant with a first exemplary embodiment of an inventive flushing and / or locking device ^¬.

FIG. 3 shows a gas turbine plant with a second ^exemplary embodiment for a flushing and / or blocking device according to the invention.

The fundamental structure of a gas turbine plant will be explained below with reference to FIG. The figure shows the gas turbine plant in a highly schematic manner and omits many details that are of no significance for the understanding of the present invention for the sake of clarity. The gas turbine plant shown in FIG. 1 comprises a compressor 1 with a compressor inlet 2 through which ambient air can enter the compressor 1, a combustion chamber section 3 and a turbine 5 with a turbine outlet 6. The plant forms a flow path from the compressor inlet 2 to the turbine outlet 6 a burner plenum 4 is fluidically connected to a compressor outlet 7 and via burners 9 and combustion chambers 8 to a turbine inlet.

In operation, the gas turbine plant ver ^¬ composed air is supplied through the burner plenum to the burners 4 from the compressor 9. 1 In the burners 9, the supplied air by means of likewise supplied fuel, which may be a liquid or a gaseous fuel, mixed and ignited and burned the mixture, whereby hot and under pressure ste ^¬ rising exhaust gases are formed, which then as a working fluid downstream of the flow Turbine 5 serve. At the Flowing through the turbine 5 to the turbine outlet 6 towards relaxes the working fluid and cools, with impulse on Tur ^¬ turbine blades 10, which are arranged on a shaft 12, is transmitted. This pulse rotates the shaft so that, for example, a generator or a working machine (not shown) can be driven by means of the rotating shaft 12. In order to optimize the flow in the turbine 5, and thus the momentum transfer to the turbine blades 10, in the turbine 5 stationary guide vanes 11 are provided, which serve to direct the mass flow of Arbeitsme ^¬ dium.

In addition, in the present embodiment with the aid of the rotating shaft 12 of the compressor 1 is driven. In this are arranged on the shaft 12 rotating compressor blades 13, with the help of the

Compressor inlet 2 sucked air forced by a tapered flow path and thereby compressed. Also in the compressor 1 there are vanes 15 which serve to direct the flow of air that enters the compressor to optimize the compressor process.

During operation of a gas turbine is thus supplied from the compaction ^¬ ter 1 compressed air to the burners 9 for there exhaust gas as an oxidant for the combustion of the fuel to the ^¬ nen and together with the fuel in the form of combustion ^¬ the working medium for the turbine 5 to form. In order to operate gas turbine systems with different loads, often finds a concept with multiple burner stages use, the individual burner stages can be individually supplied with fuel. The burner stages can be reali ^¬ Siert or by a number of individually be supplied with combustion fuel burners here by different, individual to be supplied with fuel fuel nozzles within a burner. In the present embodiment they are realized by individually with fuel to versor ^¬ constricting burner. During operation of the gas turbine plant with different loads, burner stages can be switched off, in particular if the gas turbine is operated under partial load or the gas turbine is started or stopped. The burner stages, which are not fueled in such load conditions, are then purged to purge fuel remaining in the respective burners and associated fuel lines from the burners and lines. In addition, the burners are blocked by means of a blocking fluid emerging from the burner stages against the entry of hot combustion exhaust gases from the combustion chambers into the burners. A first embodiment of a gas turbine plant with an OF INVENTION ^¬ to the invention flushing and / or locking device is described below with reference to FIG. 2

The flushing and / or blocking device shown in FIG. 2 comprises a fluid line 17 which extends from the compressor 1 to the burners 9-1 to 9-x of the gas turbine plant. In the fluid line 17, a cooler 19 and a pressure booster 21, also called booster, arranged, wherein in the present embodiment, the pressure booster 21 between the radiator 19 and the burners 9-1 to 9-x. In the present exemplary embodiment, a frequency-controlled pressure ^intensifier is used as the pressure intensifier 21.

In the present exemplary embodiment, the fluid line 17 branches between the pressure booster 21 and the burners 9-1 to 9-x in branch lines 17-1 to 17-x leading to the individual burners, with a separate branch line 17-1 to 17-x for each burner. x is provided with a check valve 23-1 to 23-x disposed therein. With the shut-off valves 23-1 to 23-x, individual burners 9-1 to 9-x can be individually connected to the flushing and / or blocking air or separated individually from the flushing and / or blocking air.

A further shut-off valve 25 is located between the cooler ^¬ ler 19 and the pressure booster 21. A third shut-off valve 27 is located in a branch fluid line, which is dependent on a Ab- Branch point 31 branches off in the fluid line 17, which is located between the booster 21 and to the burners 9-1 to 9-x leading branch lines 17-1 to 17-x. By a double lock with the help of the shut-off valves 25 and 27, the system can be protected against leakage. The shut-off valve 27 and the branch line 29 can also be used to discharge excess pressure in the fluid line sections located between the shut-off valve 25 and the shut-off valves 23-1 to 23-x.

If one or more of the burners 9-1 to 9-x means

When the compressor air is to be purged and / or blocked, the corresponding valve or valves 23-1 to 23-x are opened, so that the burner to be purged or the burners to be purged 9-1 to 9-x compressor air for rinsing and / or locks is supplied. The supplied

Compressor air can be cooled in certain operating conditions by means of the radiator 19 and brought by means of the pressure booster 21 to an elevated pressure level. With the help of cooling can thereby be heated by increasing the

Pressure can be compensated so that the increased pressure can be generated without significantly heating the compressor air. In this way, temperature shocks at the transition from a combustion operation of a burner 9-1 to 9-x to a purging and / or blocking operation of the burner 9-1 to 9-x avoided ^¬ the, as with the transition of the used as combustion air Compressor air to the used as flushing and / or sealing air compressor air no or no significant change in temperature of the supplied air is accompanied.

A second exemplary embodiment of a gas turbine plant with a flushing and / or blocking device according to the invention is shown in FIG. Elements of Figure 3 which correspond to elements of Figure 1 are designated by the same reference numerals as in Figure 1 and will not be explained again to avoid repetition. The description of the second embodiment is therefore limited to the lower ^¬ difference to the first embodiment. The rinsing and / or locking device of the second embodiment differs from the rinsing and / or Sperrvor ^¬ direction of the first embodiment is substantially DA by that a first booster 21i and a second booster 21 ₂ are present, wherein the second printer ^¬ higher 2I ₂ in a fluid line to the fluid line 17 parallel line 33 is located. This parallel fluid line section 33 branches off from the fluid line 17 between the shut-off valve 25 and the first pressure booster 21i and, in the present exemplary embodiment, reunites at the branch point 31 with the fluid line 17. By connecting two pressure booster 21i, 21 _{2 in} parallel, the increase under increased pressure fluid flow to the burners 9-1 to 9-x. Incidentally, the second Ausführungsbei ^¬ game does not differ from the first embodiment.

The invention described with reference to the embodiments allows compressed air extraction from the compressor with subsequent cooling and pressure increase compressor air to use in any operating condition of the gas turbine plant as rinsing and / or sealing air for rinsing and / or blocking individual or all burners. In relation to the combustion chamber pressure, the required pressure difference is set via the booster or boosters.

The present invention has been described in detail by way of example with reference to exemplary embodiments. Of the illustrated embodiments, however, can also be deviated from within the scope of the invention. For example, it is not absolutely necessary for the cooler 19 to be located between the compressor 1 and the pressure booster 21 or the booster elevators 21i, 21 ₂ . It is also possible for the cooler 19 to follow the pressure booster 21 or the booster elevators 21i, 21 ₂ , so that it is located between the booster 21 or the booster elevators 21i, 21 ₂ and the branch point 31. However, arranging the cooler 19 upstream of the pressure booster 21 or the pressure booster 21i, 21 ₂ offers the advantage that that the radiator 21 need not be designed for the increased pressure. It is also possible to switch from the second guide ^¬ for more than two booster 21i to 21 ₂ pa rallel ^¬, NEN order to further increase the air flow to kön-. In the embodiments, frequency controlled

Printer booster described. However, the control of the pressure booster can also be done on any other suitable type of control. In addition, in the exemplary embodiments, the compressor air used as flushing and / or sealing air was tapped at the compressor outlet. However, there is also the possibility of removing compressor air on another tapping point from the compaction ^¬ ter. The present invention is therefore not intended to be limited to combinations of features of the exemplary embodiments, but merely by the combination of features specified in the attached claims.

Claims

claims

1. rinsing and / or locking device for removal of

Compressor air from a compressor (1) of a gas turbine plant and for supplying the extracted compressor air as rinsing and / or sealing air to at least one burner (9-1, 9-x) of the gas turbine plant, wherein the rinsing and / or Sperrvorrich ^¬ tion comprises:

a fluid conduit extending between the compressor (1) and the at least one burner (9-1, 9-x)

(17) for supplying compressor air as rinsing and / or blocking air to the at least one burner (9-1, 9-x), a cooler (19) arranged in the fluid line (17) and through which the rinsing and / or blocking air flows ) and at least one in the fluid line (17) arranged and flowed through by rinsing and / or sealing air Druckhö ^¬ forth (21).

2. rinsing and / or locking device according to claim 1, in which the cooler (19) in the fluid line (17) between the compressor (1) and the at least one burner (9-1,

9-x) is located and

the trigger (21) in the fluid line (17) between the radiator (19) and the at least one burner (9- 1, 9-x) is located.

3. rinsing and / or locking device according to claim 1 or claim 2, in which at least one second pressure booster (21 ₂ ) in the fluid line (17) is arranged.

4. rinsing and / or locking device according to claim 3, in which the first booster (21i) in a first flow path of the fluid line (17) is arranged and second pressure booster (21 ₂ ) in a second flow path (33) parallel to the first flow path of the Fluid line (17) is arranged.

5. rinsing and / or locking device according to one of claims 1 to 4, in which a first shut-off valve (25) is present, that is located between the radiator (19) and the at least one pressure booster (21) in the fluid line (17).

6. Flushing and / or blocking device according to one of claims 1 to 5, in which a branch fluid line (29) is present, which does not lead to the at least one burner (9-1, 9-x), wherein the branch fluid line (29) branches off from a branch point (31) of the fluid line (17) located in the fluid line (17) between the at least one booster (21) and the at least one burner (9-1, 9-x).

7. rinsing and / or locking device according to claim 6, in which a second shut-off valve (27) is provided, which is arranged in the branch line (29).

8. rinsing and / or locking device according to one of claims 1 to 7, in which the pressure booster (21) is a frequency-controlled Druckhöher.

9. gas turbine plant with a rinsing and / or Sperrvorrich ^¬ device according to one of claims 1 to 8.

10. A method for supplying rinsing and / or sealing air to at least one burner (9-1, 9-x) comprising at least one burner (9-1, 9-x) and a compressor (1)

Gas turbine plant in which the compressor (1)

Taken from the compressor air and as flushing and / or sealing air to the at least one burner (9-1, 9-x) is supplied, wherein the compressor air after removal from the compressor (1) and before the supply to the at least one burner (9- 1, 9-x) is cooled and subjected to an increase in pressure.

11. The method of claim 10, in which the compressor air after removal from the compressor (1) is first cooled and then subjected to a pressure increase.