JPH074263A - Regeneration cycle gas turbine equipment using steam - Google Patents

Abstract

(57) [Summary] (Correction) [Constitution] The boiler feed water 33 exchanges heat with the extracted air from the compressor in the heat exchanger 15, and enters the exhaust heat recovery boiler 22. The generated steam 34 passes through the steam supply control valve 38 in the regenerator steam line 39, enters the regenerator 51, and heats the compressor discharge air. [Effect] Since there is no facility for producing cooling air for the turbine, the power consumption is reduced, the heat of the air extracted from the compressor is applied to the boiler feed water to increase the amount of steam evaporation, and when the generated steam is left, it is sent to the regenerator for combustion. Heating the air improves the thermal efficiency of the plant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam utilization regeneration cycle gas turbine facility.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. The compressor 2 draws in and compresses the atmosphere through the intake duct 1, but the compressor discharge air whose pressure has risen also rises in temperature,
It flows into the combustor 4 at the compressor outlet duct 3. Here, it mixes with the fuel 5 and burns into a high temperature gas of 1000 ° C or higher,
The turbine inlet duct 6 enters the turbine 11 to generate rotational power. This rotational power causes the compressor 2 and the load 12 to rotate on the shaft 20. The turbine uses the cooling air 14 in order to protect the metal from the hot gas, but the extraction air 13 of the compressor has a high temperature of about 200 ° C., so the cooling water 16
Is introduced into the heat exchanger 15 to cool the discharge air to form the cooling air 14. The cooling water 19 exiting the heat exchanger is the radiator 1
8 radiates heat to the atmosphere to lower the temperature, and the circulating water pump 17
Is sent again to the heat exchanger. Exhaust gas from the turbine is exhausted by the turbine outlet duct 21 into an exhaust heat recovery boiler 22.
Steam from the water supply tank 31 by heating the boiler water supply 33 sent to the boiler by the water supply pump 32.
make. On the other hand, the exhaust gas enters the chimney 41 by the exhaust duct 23 and is discharged to the atmosphere. The steam is used as various heating sources in the factory on the process steam line 37, but usually the room does not need to be heated in the summer, and the temperature of the heated product also rises in the atmosphere, so the amount of steam required is less than in the winter. To do. For this reason, a steam discharge control valve 36 for controlling the discharge amount is provided in the atmosphere discharge line 35, and when the generated steam remains, it is discharged to the atmosphere through this line. With this, the merit of recovering the exhaust heat and improving the thermal efficiency cannot be fully utilized.

Japanese Patent Laid-Open No. 60-205102 discloses an invention related to this exhaust heat recovery power generator, but since it has a heat storage tank and an evaporator, it has the drawbacks of high equipment cost and poor thermal efficiency.

[0004]

The thermal efficiency of the exhaust heat recovery power generation facility is to utilize the heat quantity of the supplied fuel without waste, but conventionally, the heat source of air or steam heated at all has been effectively used. Absent. An object of the present invention is to recover heat from the air heated by the compressor and to effectively utilize the generated steam all year round.

[0005]

There is provided a heat exchanger for cooling the compressor extraction air with boiler feed water for use as cooling air, and conversely heating the boiler feed water. Also, the line that uses the generated steam as a heating source in the factory and the compressor outlet duct 3
A regenerator is installed in the room, and a line for supplying steam is installed in the regenerator.

[0006]

[Operation] If the boiler feed water heated by the heat exchanger is sent to the exhaust heat recovery boiler, the amount of steam generated will increase compared to the conventional case. When the generated steam is not used as a heating source in the factory, the steam is sent to the regenerator to raise the inlet air temperature of the combustor, thereby reducing the fuel supply amount and increasing the thermal efficiency.

[0007]

Embodiments of the present invention will be described in detail below with reference to FIG. The boiler feed water 33 pressurized from the feed water tank 31 by the feed water pump 32 is heated by the extraction air 13 of the compressor in the heat exchanger 15, and enters the exhaust heat recovery boiler 22 to generate steam 34. Conventionally, the amount of heat that this extracted air had was discarded into the atmosphere, but the amount of evaporation in the boiler increases by recovering it with boiler feed water. Even if the amount of generated steam increases, the thermal efficiency cannot be improved unless the process steam line 37 always uses the entire amount. However, since the amount of steam used in summer is inevitably smaller than in winter, in order to use this effectively without discarding it, a regenerator 51, a regenerator steam line 39 and a steam supply control valve 38 are provided in the middle of the compressor outlet duct 3. , The compressor discharge air flowing into the combustor 4 is heated by sending steam. The combustor injects the fuel 5 to produce combustion gas at a certain constant temperature of 1000 ° C. or higher, but since the temperature of the air is raised in the regenerator, the consumption of the injected fuel becomes smaller than usual. For this reason, it becomes possible to effectively use the entire amount of steam generated over the course of the year, and it is possible to always operate the plant with the highest thermal efficiency.

If the full amount of steam is used for various heating in the factory, the steam supply control valve may be closed, and if steam is sent to both, the steam supply control valve is opened / closed during opening. And

[0009]

According to the present invention, the equipment for cooling the extracted air of the compressor to produce the cooling air of the turbine was provided, but since the boiler water supply is used as a substitute, the circulating water pump and the radiator are eliminated, and the equipment cost is reduced. And the power consumption can be reduced.

Further, since a part of the heat quantity held by the extracted air of the compressor is given to the boiler feed water and sent to the exhaust heat recovery boiler, the amount of steam generated increases.

Further, when a part or all of the steam generated in the exhaust heat recovery boiler is surplus, what is conventionally discharged to the atmosphere is sent to the regenerator to heat the compressor discharge air which is the combustion air to heat the combustor. It reduces the fuel consumption injected into and improves thermal efficiency.

[Brief description of drawings]

FIG. 1 is an overall system diagram of a conventional exhaust heat recovery power generation facility.

FIG. 2 is an overall system diagram of a steam utilization regeneration cycle gas turbine facility according to the present invention.

[Explanation of Codes] 1 ... Intake duct, 2 ... Compressor, 3 ... Compressor outlet duct,
4 ... Combustor, 5 ... Fuel, 6 ... Turbine inlet duct, 11
... turbine, 12 ... load, 13 ... extraction air, 14 ... cooling air, 15 ... heat exchanger, 20 ... shaft, 21 ... turbine exit duct, 22 ... exhaust heat recovery boiler, 23 ... exhaust duct, 31 ... water tank, 32 ... Water supply pump, 33 ... Boiler water supply, 34 ... Steam, 37 ... Process steam line, 38
… Steam supply control valve, 39… Regenerator steam line.

Front Page Continuation (72) Inventor Akira Hirano 3-2-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Engineering Co., Ltd.

Claims (2)

[Claims] 1. A compressor for sucking and compressing the atmosphere, a combustor for mixing compressed air with fuel to produce combustion gas, a turbine for generating power by the combustion gas, and exhaust gas at the outlet of the turbine. In a gas turbine facility including an exhaust heat recovery boiler that generates steam, a regenerator is provided between the compressor and the combustor, and the outlet air of the compressor is heated by the steam generated in the exhaust heat recovery boiler. A steam-utilized regenerative cycle gas turbine facility characterized by the following. 2. The steam-utilizing regeneration cycle gas turbine facility according to claim 1, further comprising a heat exchanger for exchanging heat between the extracted air of the compressor and the feed water of the exhaust heat recovery boiler.