JPH11107779A - Compressed air storage type gas turbine plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ease a pressure condition for a turbine structure part so as to facilitate designing and improve efficiency of a plant by arranging a high pressure air turbine between a compressed air storage tank and a combustor in a gas turbine plant in which compressed air stored in the compressed air storage tank is fed to the combustor. SOLUTION: Basically, this gas turbine plant is constructed of a compressor 1, a compressed air storage tank 2, a combustor 3, and a gas turbine 4, and a high pressure air turbine 8, which is assembled in a compressed air supply passage ranging from the storage tank 2 to the combustor 3, is arranged coaxially with the gas turbine 4. In the nighttime, the compressor 1 is driven so as to open a compressed air storage tank inlet side valve 6, and compressed air is stored in the storage tank 2. In the daytime, a compressed air storage tank outlet side valve 7 is opened so as to supply compressed air to the high pressure air turbine 8. The compressed air, which worked and reduced its pressure, flows into the combustor 3 and is mixed with fuel so as to be burnt, and the burnt mixture becomes combustion gas to drive the gas turbine 4, so that a generator 5 is rotated to generate electricity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air storage type gas turbine plant in which compressed air is stored in a compressed air storage tank and supplied to a combustor for combustion or the like.

[0002]

2. Description of the Related Art A conventional compressed air storage type gas turbine plant will be described with reference to FIG.

[0003] 1 is a compressor, 2 is a compressed air storage tank buried underground or the like, 3 is a combustor, 4 is a gas turbine operated by exhaust gas from the combustor 3, 5 is a generator driven by the gas turbine 4 is there.

Reference numeral 6 denotes a compressed air storage tank inlet side valve, which is located at a position for opening and closing a path for supplying high-pressure air of the compressor 1 to the compressed air storage tank 2, and reference numeral 7 denotes a compressed air storage tank outlet side valve. It is provided at a position for opening and closing a compressed air supply path for supplying the compressed air stored in the storage tank 2 to the combustor 3.

[0005] In the gas turbine plant configured as described above, the compressor 1 is driven by using the surplus power at night, and the air is compressed and stored in the compressed air storage tank 2 during the daytime when a large amount of power is required. The generator is directly connected to the gas turbine 4 by driving the gas turbine 4 with the combustion gas by mixing and burning the stored high-pressure compressed air with fuel separately supplied by the combustor 3. 5 is used to generate power and satisfy the required power demand.

When the air is compressed at night in this manner, the compressed air storage tank inlet side valve 6 disposed on the path corresponding to the outlet side of the compressor 1 is opened to open the compressed air storage tank. The compressed air storage tank outlet valve 7 installed in the compressed air supply path at a position corresponding to the inlet side of the combustor 3 when viewed from the combustor 3 is in a closed state.

On the other hand, when power is generated in the daytime, the compressor 1 is stopped and the compressed air storage tank inlet side valve 6 is closed, and the compressed air storage tank outlet side valve 7 is opened to open the compressed air storage tank. The operation is switched so that the compressed air stored in the storage tank 2 is guided to the combustor 3.

[0008]

In such a compressed air storage type gas turbine plant, a compressed air storage tank 2 is provided.
High-pressure air stored in the compressed air storage tank 2
From the viewpoint of the cycle efficiency of the plant, the pressure is optimally about 60 to 80 kg / cm ² ,
For this reason, in the compressed air storage type gas turbine plant, operation under a significantly higher pressure condition is required as compared with a normal open cycle gas turbine.

That is, the operating pressure of a general industrial gas turbine is at most about ²⁰ to 30 kg / cm ² , and the temperature of the working gas supplied to the gas turbine is 135.
It is designed so that the structure is established at about 0 ° C.

On the other hand, in a gas turbine plant of a compressed air storage type, especially in the case of a turbine casing, when the pressure is increased due to the high temperature of the working gas, the strength design becomes difficult. There is a problem that it is extremely difficult to design a turbine casing that can withstand operation.

The present invention has been made to solve the above problems in the prior art, and to ease the design by relaxing the pressure condition of the turbine structure, and to improve the efficiency of the plant. It is an object to provide

[0012]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a gas turbine plant for supplying compressed air stored in a compressed air storage tank to a combustor, a compressed air storage tank and a combustion chamber are provided. The present invention provides a compressed air storage type gas turbine plant having a high-pressure air turbine interposed between units.

That is, the present invention employs a high-pressure air turbine, and arranges the high-pressure air turbine in a compressed-air supply path communicating between the compressed-air storage tank and the combustor. Supplying compressed air to the combustor by recovering a part of the energy of the air, thereby reducing the pressure condition of the gas turbine and relaxing the design standard of the combustor and the following gas turbine; and The purpose of the present invention is to improve the efficiency of the plant by efficiently using the stored energy of the compressed air collected by the high-pressure air turbine.

[0014]

FIG. 1 shows an embodiment of the present invention.
It will be described based on.

FIG. 1 schematically shows the whole of a gas turbine plant according to the present embodiment. The same parts as those of the above-described conventional one are denoted by the same reference numerals in the drawings, and the overlapping description will be omitted as much as possible to focus on the characteristic parts.

That is, in the present embodiment, the compressor 1, the compressed air storage tank 2, the combustor 3, and the gas turbine 4 are connected to the combustor 3 from the compressed air storage tank 2 based on the basic configuration in which the compressed air communicates with the gas turbine 4. A high-pressure air turbine 8 is incorporated in a compressed air supply path leading to the compressed air supply path, and is arranged coaxially with the gas turbine 4.

Accordingly, similarly to the above-mentioned conventional one, the compressor 1 is driven at night to open the compressed air storage tank inlet side valve 6 (at this time, the compressed air storage tank outlet side valve 7).
Is closed), and the compressed air is stored in the compressed air storage tank 2 below the surface.
But in the daytime, the compressed air storage tank outlet valve 7
(At this time, the compressed air storage tank inlet side valve 6 is closed) to supply high-pressure compressed air to the high-pressure air turbine 8.

The compressed air that has been reduced in pressure by working in the high-pressure air turbine 8 flows into the combustor 3 and mixes and combusts with fuel supplied from a fuel system (not shown) to form combustion gas, and the gas turbine 4 When driven, the generator 5 is rotated to generate the desired power.

Here, the pressure of the high-pressure compressed air stored in the compressed air storage tank 2 is preferably 60 to 60 in view of the storage capacity of the compressed air storage tank 2 and the cycle efficiency of the plant as described above. Since the pressure is about 80 kg / cm ² , this is supplied to the high-pressure air turbine 8 via the compressed-air storage tank outlet valve 7, and the high-pressure air turbine 8 is driven by the high-pressure compressed air to perform a predetermined work. Thereby, the pressure is reduced to about 20-30 kg / cm ² .

Next, the air depressurized in this manner is supplied to the combustor 3 for combustion, and the combustion gas is guided to the downstream gas turbine 4, so that the pressure applied to the gas turbine 4 is greatly reduced. In addition, a normal design method can be applied to the gas turbine 4, and the strength design of the turbine casing and the like becomes easy.

In the high-pressure air turbine 8, the pressure is as high as about 60 to 80 kg / cm ^{2 as} described above, but since the temperature level is low, there is no problem in structural design.

Although the high-pressure air turbine 8 has been described as being coaxial with the gas turbine 4, it is needless to say that the high-pressure air turbine 8 does not necessarily have to be coaxial and may have a multi-shaft structure.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0024]

As described above, according to the present invention, in a gas turbine plant for supplying compressed air stored in a compressed air storage tank to a combustor, a high-pressure air turbine is provided between the compressed air storage tank and the combustor. Since the gas turbine plant is configured with intervening, a part of the energy of the compressed air is recovered by a high-pressure air turbine incorporated in the compressed air supply path leading from the compressed air storage tank to the combustor,
By supplying compressed air decompressed by the operation of the high-pressure air turbine to the combustor, the pressure of the gas turbine is reduced, and the design standards for the combustor and the subsequent gas turbine are relaxed. And the efficiency of the plant can be improved by recovering the stored energy of the compressed air without waste.

[Brief description of the drawings]

FIG. 1 is a system diagram of a compressed air storage type gas turbine plant according to an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional compressed air storage type gas turbine plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Compressed air storage tank 3 Combustor 4 Gas turbine 5 Generator 6 Compressed air storage tank inlet side valve 7 Compressed air storage tank outlet side valve 8 High pressure air turbine

Claims (1)

[Claims] 1. A gas turbine plant for supplying compressed air stored in a compressed air storage tank to a combustor, wherein a high-pressure air turbine is interposed between the compressed air storage tank and the combustor. Type gas turbine plant.