JPH0763069A - Gas turbine plant - Google Patents

Abstract

PURPOSE:To keep off any drop in output power by enabling it to cool all hot parts of a gas turbine plant which has no cooling air source inside. CONSTITUTION:A first extraction steam pipe 6 is branched off from the downstream of a regenerator 3, and a pressure reducing orifice 8 and a temperature regulating valve 9 are installed there. In addition, a second extraction steam pipe 7 is branched off from the upstream of the regenerator 3 and the pressure reducing orifice 8 is installed likewise. A feed pipe 10 is provided with a flow regulating valve 12, feeding a cooling object of a gas turbine 1 with compressed air so far regulated to optimum pressure, temperature and flow rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine plant applied to business and private power generation facilities.

[0002]

BACKGROUND OF THE INVENTION Gas turbine efficiency is highly dependent on inlet air temperature, and therefore gas turbines have been modified to increase gas turbine inlet temperature in order to increase their efficiency. However, on the other hand, since high temperature parts such as blades and rotors have no material without cooling, some air is extracted from the compressor that is uniaxially connected to the gas turbine 1 and sends compressed gas as shown in FIG. In recent years, the mainstream gas turbine has improved the reliability of the equipment by supplying cooling air of optimum temperature and pressure to the rotor and blades of each stage.

[0003]

As described above, in the conventional gas turbine, since the turbine is uniaxially connected to the compressor, the gas is extracted from an appropriate position of the compressor to the high temperature parts of the gas turbine. To provide cooling air. However, such as a new system plant
In a unit in which the compressor and the gas turbine operate separately, there is no internal cooling air source, and the turbine inlet temperature must be lowered from the viewpoint of protecting the constituent materials of the turbine. Therefore, there is a problem that the output of the gas turbine is reduced, and a countermeasure has been desired.

Therefore, an object of the present invention is to prevent a decrease in output by enabling cooling of high temperature parts of a gas turbine plant having no internal cooling air source.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by providing a compressed air source for supplying compressed air for combustion to a combustor, and compressed air and fuel supplied from the combustor. A combustor that combusts to generate high-temperature gas, a turbine that introduces the high-temperature gas generated by the combustor, and a heat exchanger that exchanges heat between exhaust gas of the turbine and compressed air supplied from the compressed air source to the combustor. In a gas turbine plant having, a first compressed air extraction pipe for extracting compressed air before heat exchange from the upstream side of the heat exchanger via a pressure reducing orifice and a control valve, and from the downstream side of the heat exchanger. A second compressed air extraction pipe for extracting compressed air after heat exchange through a decompression orifice, the first compressed air extraction pipe and the second
And a compressed air supply pipe for supplying compressed air extracted from the respective extraction pipes to each other and supplying an appropriate amount to the high temperature portion of the turbine through a flow rate adjusting valve. It is a gas turbine plant characterized in that.

[0006]

According to the above means, the compressed air supplied from the external compressed air supply source can be used to supply the compressed air adjusted to the optimum pressure, the optimum temperature and the optimum flow rate to the cooling target of the gas turbine. As a result, high temperature parts can be cooled. The pressure is adjusted by the pressure reducing orifices provided in the first and second compressed air extraction pipes, the temperature is adjusted by the confluence of the compressed air extracted from the upstream side and the downstream side of the heat exchanger, and the flow rate is adjusted by the compressed air supply pipe. It is made by the flow rate adjusting valve provided in the.

[0007]

Embodiment An embodiment of the present invention will be described with reference to FIG.
This gas turbine plant includes a gas turbine 1, a combustor 2, and a regenerator 3 as a heat exchanger. Regenerator 3
Has a function of exchanging heat between the high temperature gas turbine exhaust gas and the compressed air to raise the temperature of the compressed air.

Compressed air is sent from a compressed air source (not shown) through a compressed air pipe 4, heated in a regenerator 3 and burned in a combustor 2, and the combustion gas is used by the gas turbine 1
After being operated, the exhaust gas duct 5 guides it to the chimney and releases it to the atmosphere.

In the present invention, since a part of the above-mentioned compressed air is used as cooling air, the first compressed air extraction pipe (hereinafter referred to as the first extraction pipe) 6 is branched from the compressed air pipe 4 on the upstream side of the regenerator 3. In addition, the second compressed air extraction pipe (hereinafter referred to as the second extraction pipe) 7 is branched from the compressed air pipe 4 on the downstream side of the regenerator 3. The first extraction pipe 6 is provided with a decompression orifice 8 and a temperature control valve 9 and is connected to a second extraction pipe 7 also provided with the decompression orifice 8 to supply compressed air for cooling to a high temperature portion of the gas turbine 1. A compressed air supply pipe 10 for supplying is formed. The compressed air supply pipe 10 is provided with a thermometer 11 and a flow rate adjustment valve 12.

With such a structure, the compressed air supplied from the compressed air supply source is cooled at a temperature after the low temperature compressed air is extracted by the first extraction pipe and reduced to the optimum pressure by the decompression orifice 8. The temperature is controlled to an optimum temperature by the control valve 9 and introduced into the compressed air supply pipe 10. On the other hand, the high-temperature compressed air extracted by the second extraction pipe 7 is decompressed to the optimum pressure by the decompression orifice 8, and then merged with the compressed air in the first extraction pipe 6 by the compressed air supply pipe 10 to form a flow rate adjusting valve. 10
Is adjusted to an optimum flow rate and is supplied as cooling air to each cooling target (blade, rotor, etc.) of the gas turbine 1. In this embodiment, the temperature of the compressed air (compressed air after joining) in the compressed air supply pipe 10 is measured by the thermometer 11, and the signal is fed back to the temperature control valve 9. That is, the temperature control valve 9 is a flow rate control valve capable of automatically adjusting the valve opening degree based on a signal from the thermometer 11, and is a system that adjusts the temperature by changing the amount of low temperature compressed air.

In the above embodiments, the temperature control valve 9 is provided only on the first extraction pipe 6, but the temperature control valve 9 may be provided only on the second extraction pipe 7, or ,
It may be provided in both the first extraction pipe 6 and the second extraction pipe 7.
When it is installed only in the second extraction pipe 7, it becomes a system that adjusts the temperature by changing the amount of high temperature compressed air, and when it is installed in both extraction pipes 6 and 7, it changes both the low temperature and high temperature compressed air amounts. The temperature will be adjusted.

[0012]

According to the present invention described above, the following effects can be obtained by adopting an external compressed air supply source as the cooling air system of the gas turbine. That is, even in a unit such as a new system in which the gas turbine and the compressor are operated separately, it is not necessary to lower the turbine inlet temperature, so that the turbine output can be prevented from lowering.

[Brief description of drawings]

FIG. 1 is a system diagram of a main part of a gas turbine plant showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional turbine cooling air system.

[Explanation of symbols]

 1 gas turbine 2 combustor 3 regenerator (heat exchanger) 4 compressed air pipe 5 exhaust gas duct 6 first extraction pipe (first compressed air extraction pipe) 7 second extraction pipe (second compressed air extraction pipe) 8 Decompression orifice 9 Temperature control valve (control valve) 10 Compressed air supply pipe 11 Thermometer 12 Flow rate control valve

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[Procedure amendment]

[Submission date] September 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems and provides a compressed air source for supplying compressed air for combustion to a combustor, and compressed air and fuel supplied from the compressed air source. For exchanging heat between the combustor for combusting the gas to generate high-temperature gas, the turbine for introducing the high-temperature gas generated by the combustor, and the exhaust of the turbine and the compressed air supplied from the compressed air source to the combustor. In a gas turbine plant having a heat exchanger, a first compressed air extraction pipe for extracting compressed air before heat exchange from an upstream side of the heat exchanger via a pressure reducing orifice and a control valve, and a downstream side of the heat exchanger. Second, the compressed air after heat exchange from the air is extracted through the decompression orifice.
Of the compressed air extraction pipe, the first compressed air extraction pipe and the second compressed air extraction pipe are connected to each other, and the compressed air extracted from the extraction pipes joins each other, and an appropriate amount is supplied via the flow rate adjusting valve. Is a compressed air supply pipe for supplying the high temperature part of the turbine to the gas turbine plant.

Claims (1)

[Claims] 1. A compressed air source for supplying compressed air for combustion to a combustor, a combustor for combusting the compressed air and fuel supplied from the combustor to generate high temperature gas, and a high temperature generated by the combustor. In a gas turbine plant having a turbine for introducing gas and a heat exchanger for exchanging heat between the exhaust gas of the turbine and the compressed air supplied from the compressed air source to the combustor, heat from the upstream side of the heat exchanger A first compressed air extraction pipe for extracting compressed air before exchange through a pressure reducing orifice and a control valve, and a second compressed air extraction pipe for extracting compressed air after heat exchange from the downstream side of the heat exchanger through a pressure reducing orifice. A compressed air extraction pipe is connected to the first compressed air extraction pipe and the second compressed air extraction pipe, the compressed air extracted from each extraction pipe is joined, and an appropriate amount is supplied via a flow rate adjusting valve. Hot part of the turbine Gas turbine plant, characterized by comprising comprises a compressed air supply pipe for supplying for.