GAS TURBINE COMPRISING A WET COMPRESSION DEVICE FOR INTRODUCING A SURFACTANT LIQUID MIXTURE

Abstract

A gas turbine having a wet compression device which allows droplets of an aqueous liquid mixture to be introduced into a compressor of the gas turbine during operation of the gas turbine, the aqueous liquid mixture containing at least one surfactant. The aqueous liquid mixture additionally contains at least a defoaming agent, and the gas turbine has a second metering device, which is designed to feed a predetermined quantity of defoaming agent into water which is provided for use in the wet compression device.

Claims

1.-7. (canceled)

8. A gas turbine comprising: a wet compression device, by means of which an aqueous liquid mixture in droplet form containing at least one surfactant is introduced into a compressor of the gas turbine during the operation of the gas turbine, wherein the aqueous liquid mixture additionally contains at least a defoaming agent, and a second metering device, which is designed to feed a predetermined quantity of defoaming agent into water which is provided for use in the wet compression device.

9. The gas turbine as claimed in claim 8, further comprising: a first metering device, which is designed to feed a predetermined quantity of surfactant into water which is provided for use in the wet compression device.

10. The gas turbine as claimed in claim 8, wherein the at least one surfactant is selected from the following group of surfactants: polyalkylene glycol ether, polysorbate20, alkyl polyglycosides.

11. The gas turbine as claimed in claim 8, wherein the at least one defoaming agent is selected from the following group of defoaming agents: tri-n-butyl phosphate, monoglycerides, diglycerides.

12. A method for operating a gas turbine as claimed in claim 8, comprising: feeding the aqueous liquid mixture to the wet compression device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawing:

[0031] FIG. 1 shows a first embodiment of the gas turbine according to the invention in a schematic circuit diagram;

[0032] FIG. 2 shows a schematic circuit diagram of a second embodiment of the gas turbine according to the invention.

DETAILED DESCRIPTION OF INVENTION

[0033] FIG. 1 shows a first embodiment of a gas turbine 1 according to the invention in a schematic circuit diagram. The gas turbine 1 comprises a wet compression device 10, by means of which an aqueous liquid mixture 5 can be introduced into the compressor 2 of the gas turbine 1 via nozzles 11. In this case, the aqueous liquid mixture 5 is sprayed directly into the intake air flow during the operation of the gas turbine 1, wherein the aqueous liquid mixture 5 is atomized into relatively small droplets. The aqueous liquid mixture 5 is then increasingly evaporated in the compressor, with the result that, after a certain compressor stage, there is no longer any more liquid mixture but only the evaporated form thereof. This is compressed together with the intake air and fed to the combustion chamber 3 for combustion with a fuel (not designated specifically). The hot gas mixture thus formed is expanded via the expansion turbine 4 and then discharged from the latter.

[0034] In order then to ensure that the liquid mixture is atomized into relatively small liquid droplets, the present embodiment of the gas turbine 1 envisages supplying the wet compression device 10 with an aqueous liquid mixture 5 which contains at least one surfactant 6 and at least one defoaming agent 7. The surfactant 6 is stored in a first container 8 and, depending on requirements, can be added via a first metering device 21 to the water provided for operation in the wet compression device. Here, the first metering device 21 can also be switched by means of an open-loop and/or closed-loop control unit, which takes into account current operating parameters of the gas turbine 1 when setting the quantity of surfactant.

[0035] Likewise, the quantity of defoaming agent 7 can be set by means of a second metering device 22. The defoaming agent 7 is stored in a second container 9, wherein defoaming agent can be fed into the water from this as required, said water being provided for use in the wet compression device 10.

[0036] Owing to the introduction of a surfactant, the surface tension of the water which is atomized by means of the nozzles 11 in the wet compression device 10 then falls. Through the reduction of the surface tension, it is thus possible, on the one hand, to achieve improved atomization and, on the other hand, bursting of the water droplets formed on the surface of the compressor rotor blades can take place with a reduced transfer of momentum. Since the droplets are of a relatively smaller size than, for instance, in comparison with a wet compression device without the admixture of surfactant, the evaporation of the water or liquid mixture introduced into the compressor 2 also takes place more quickly, and the erosion phenomena on the surface of the compressor blades can be reduced. As already explained above, the defoaming agent 7 serves primarily for the avoidance of clogging of the compressor 2 by the formation of foam.

[0037] FIG. 2 shows another embodiment of the gas turbine 1 according to the invention, which differs from the embodiment shown in FIG. 1 in that the surfactant 6 and/or the defoaming agent 7 is/are not provided in the region of the feed line of the wet compression device 10 for the nozzles 11; instead, the nozzles 11 are supplied centrally directly from a storage container 12, into which water, surfactant 6 and defoaming agent 7 are introduced for the purpose of mixing with one another. The storage container 12 thus contains a suitable aqueous liquid mixture 5 which has already been fully mixed and which can be withdrawn and fed to the nozzles 11 of the wet compression device 10 without further chemical conditioning. The quantity of surfactant 6 and of defoaming agent 7 can each be set by a first metering device 21 and a second metering device 22, wherein the respective metering devices 21, 22 enable a predetermined quantity of surfactant 6 to be withdrawn from the first container 8 or of defoaming agent 7 to be withdrawn from the second container 9.

[0038] Further embodiments of the invention will become apparent from the dependent claims.