JPH108995A - Gas turbine generating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an installation space for facilities and improve the utilization factor of a hot water cleaner by allowing hot water to be guided from a common hot water tank and supplied to the hot water cleaner and a fuel decompression heater. SOLUTION: Proper pressure and temperature are given to fuel gas by a fuel decompression heater 2 constituted by a fuel gas heater 9 and a decompression valve 3 to be supplied to a fuel tank 7 for a gas turbine 6. As a heating source for the fuel gas heater 9, hot water obtained by a hot water cleaner 20 is used. A hot water supply pipe 30 branches from a cleaning water supply pipe 25 on the discharge side of a hot water cleaning pump 24 to supply hot water to the fuel gas heater 9 via a supply stop valve 31. That is, hot water supplied to the hot water cleaner 20 and the fuel decompression heater 2 is guided from a common hot water tank 23. In this way, there is no need for special hot water supply facilities which are conventionally required to heat fuel and the utilization factor of the hot water cleaner which is conventionally lower is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine power generation system having a fuel pressure reduction heating device and a hot water cleaning device.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic diagram of a fuel supply system in a conventional gas turbine power generation facility. In FIG.
A relatively high pressure fuel gas of about 70 kg / cm ² supplied by the fuel gas supply pipe 1 is decompressed to a pressure of about 30 kg / cm ² which satisfies predetermined conditions by a pressure reducing valve 3 constituting a fuel pressure reducing and heating device 2. Thereafter, the fuel is supplied to a combustor 7 constituting a gas turbine 6 via a fuel cutoff valve 4 and a fuel flow control valve 5.

When the high-pressure fuel gas is decompressed, the temperature of the fuel gas itself decreases due to adiabatic expansion. In the above example, the pressure is reduced from 70 kg / cm ² to 30 kg / cm ²
A temperature decrease of about 30 ° C occurs. Normally, the fuel supplied to the gas turbine 6 has a minimum supply temperature in addition to the pressure limitation at the inlet of the fuel cutoff valve 4, so that the temperature of the supplied fuel drops below the specified value except in a relatively high summer season. I do. Therefore, a fuel gas heater 9 is required to raise the temperature of the fuel gas to a specified value or more. Usually, the fuel gas heater 9 is installed on the upstream side of the pressure reducing valve 3 provided in the fuel gas supply pipe 1 and is depressurized. Before the temperature is raised.

[0004] The fuel gas heater 9 is a non-contact heat exchanger with fuel gas. Conventionally, as a heating source, a hot water supply system 10 is provided for safety and control stability. The supplied hot water (about 100 ° C) is used. In the hot water supply equipment 10, room temperature service water or pure water in the power plant is supplied to the hot water tank 11, and the temperature is raised (about 100 ° C.) by a heat source (steam or electric heater, etc.). The fuel gas is supplied to the fuel gas heater 9 via a hot water supply line 14 by a pump 13. Then, after the hot water exchanges heat with the fuel gas in the heater 9, the hot water is returned to the hot water tank 11 through the hot water return line 15, heated again, and constitutes a cycle to be reused for heating the fuel gas. doing.

On the other hand, the gas turbine 6 takes in outside air as fuel air by an air compressor 6a, raises the pressure of the air, guides it to a combustor 7, and mixes the fuel with the fuel supplied by the fuel supply system described above.
The fuel is burned, the fuel gas is led to the turbine 6b, and the energy of the fuel gas is converted into shaft output.
The electric power is converted into electric energy by a generator 8 coaxially connected.

The air passage of the air compressor 6a that takes in the outside air has a problem that oil and dust in the air adhere thereto.
Cleaning is performed with water, hot water, cleaning agent-containing water, or the like at regular intervals of about once every 6 months when the gas turbine is stopped to maintain and recover performance. When performing hot water cleaning, a hot water cleaning device 20 is used. The hot water cleaning device 20 supplies normal-temperature water or pure water to a cleaning hot water tank 23 from an in-house system through a water supply system 21 to a cleaning hot water tank 23, and heats the water with a heating device (electric heater or steam) 22 to about 90 ° C. Make hot water.

[0007] Usually, this warm water washing is performed systematically, so that these operations are performed in advance in advance in consideration of the time required for water storage and temperature rise. Therefore, the heating device
If an electric heater is used for 22, a heater (capacity of about 100 kw) that can complete the temperature rise for several hours is selected. The hot water is pressurized by the washing hot water pump 24 and is injected through the washing water supply pipe 25 and the washing water stop valve 26 into the inlet of the air compressor 6a of the gas turbine 6 in a state where the rotation speed is maintained at a specified speed by a starting motor or the like. Is done. The air passage portion that is contaminated by the operation is washed by the water hammer action of the injected hot water.

[0008]

In the above configuration,
Conventionally, a fuel pressure reduction heating device requires a dedicated hot water supply equipment for fuel heating, and in addition to control of the fuel pressure reduction heating device itself, control of a hot water facility is also required, and the system is complicated. There are issues. The installation room space for the equipment is required, and in a power plant with many layout restrictions, there may be a problem in securing the installation space.

On the other hand, the above-mentioned hot water washing apparatus is an indispensable equipment for gas turbine equipment, but its operation is basically about once every three to six months. There is a problem that it is low. As a permanent installation, such an operation method is undesired for the apparatus and may cause a failure. Therefore, it is necessary to increase the utilization rate as much as possible.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and eliminates the need for a dedicated hot water supply facility conventionally required for heating fuel in a fuel pressure reducing heating apparatus. It is an object of the present invention to provide a gas turbine power generation facility capable of increasing a utilization rate of a hot water cleaning device having a low utilization rate.

[0011]

According to a first aspect of the present invention, there is provided a fuel pressure reducing and heating apparatus for raising and reducing the temperature of fuel supplied to a gas turbine, and an air compressor for compressing air supplied to the gas turbine. Gas turbine power generation equipment having a hot water cleaning device for supplying hot water to the gas turbine, wherein the hot water supplied to the hot water cleaning device and the fuel pressure reducing and heating device is guided from a common hot water tank. Provide equipment.

According to the first aspect of the present invention, since the heat source of the fuel pressure reduction heating device and the hot water washing device can be shared, the equipment utilization rate of the hot water tank can be improved and the equipment can be reduced. Can be.

According to a second aspect of the present invention, the hot water supplied to the fuel pressure reducing and heating apparatus according to the first aspect of the present invention is guided from a downstream side of a cleaning hot water pump for guiding the cleaning hot water to the gas turbine. A gas turbine power generation facility is provided.

According to the second aspect of the present invention, the pump of the fuel pressure reducing and heating device and the pump of the hot water washing device can be shared, so that the utilization rate of the pump can be improved and the equipment can be reduced.

According to a third aspect of the present invention, the hot water supplied to the fuel pressure reducing and heating apparatus according to the first aspect of the present invention is a hot water circulating pump which is disposed upstream of the cleaning hot water pump for guiding the cleaning hot water to the gas turbine. And a gas turbine power generation facility characterized in that the gas turbine power generation facility is guided through the gas turbine power generation facility.

According to the third aspect of the present invention, since the hot water tank is shared and the pumps for guiding the hot water are separately installed, the equipment can be reduced, and the pump start / stop signals are turned on and off. Control is sufficient, and control of the pump can be facilitated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, FIG.
The same reference numerals are given to the same parts as those described above, and the description of the configuration of that part is omitted. In FIG. 1, the fuel gas is adjusted to an appropriate pressure and temperature by a fuel pressure reducing / heating device 2 including a fuel gas heater 9 and a pressure reducing valve 3, and a fuel device 7 of a gas turbine 6 is provided.
Supplied to In the present embodiment, hot water obtained by the hot water cleaning device 20 is used as a heating source of the fuel gas heater 9. Therefore, the hot water washing pump 24
The hot water supply pipe 30 is branched from the cleaning water supply pipe 25 on the discharge side of the above, and the hot water is supplied to the fuel gas heater 9 via the supply stop valve 31. With such a system, an additional pump for supplying hot water to the fuel gas heater 9 is not required. The fuel gas is heated by the fuel gas heater 9, and the supply water whose temperature has dropped is washed through the hot water return pipe 32 through the cleaning hot water tank.
The system returns to 23.

During the operation of the system including the fuel pressure reducing and heating apparatus 2, the gas turbine 6 is also operating, so that the flush water stop valve 26 provided in the flush water supply pipe 25 is closed to clean the gas turbine 6. Prevent water from entering.

Further, in order to make the water in the hot water washing tank hot water of about 90 ° C., the heating apparatus 22 having an output of about 100 kW was conventionally provided. Requires a capacity of 500 to 600 kw, about 5 to 6 times. Therefore, in the present embodiment, the second heating device 33 used only during the operation of supplying hot water to the fuel pressure reducing and heating device 2 is provided. The heating device 22 and the second heating device 33 may be electric heaters or steam types. Further, such a heater is a fuel pressure reducing / heating device 2, a hot water cleaning device.
A method of providing one large-capacity heating device that can handle both of the 20 operations may be used.

When the hot water cleaning of the air compressor 6a of the gas turbine 6 is performed, the gas turbine 6 is stopped as described above, and the fuel pressure reducing and heating device 2 is also stopped. No hot water supply is required. Therefore, a supply stop valve 31 for shutting off hot water is provided.

As described above, in the present embodiment,
The hot water washing tank, which is a component of the hot water washing device, the heating device used for hot watering and the hot water washing pump, the hot water tank of the hot water supply equipment to the fuel gas heating device of the fuel decompression heating device, the heating device in the hot water tank, and the hot water It can be shared as a substitute for the circulation pump. In addition, the components of the hot water cleaning device can be operated to cope with the operation of the fuel pressure reducing and heating device even during the operation of the gas turbine.

Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the same parts as those in FIG.

In FIG. 2, a washing hot water pump 24 is provided in the washing water supply pipe 25. And the washing hot water pump
A hot water supply pipe 35 is branched from the upstream side of the pipe 24, and hot water is guided to the fuel gas heater 9 via a hot water circulation pump 34 and a supply stop valve 31.

In the present embodiment, the hot water washing tank and the heating device used for hot watering, which are the components of the hot water washing device, are replaced by a hot water tank and a hot water supply device for supplying hot water to the fuel gas heating device of the fuel pressure reducing and heating device. It can be shared as a substitute for the heating device in the tank. In addition, the components of the hot water cleaning device can be operated to cope with the operation of the fuel pressure reducing and heating device even during the operation of the gas turbine. Furthermore, since dedicated pumps are installed, there is no need to control the pump output according to the supply capacity of the equipment.
Only N, OFF control is required, and the control can be simplified.

[0025]

As described above, in the present invention,
Gas turbine power generation equipment that eliminates the need for dedicated hot water supply equipment conventionally required for fuel heating in fuel pressure reduction heating equipment, and can increase the utilization rate of hot water cleaning equipment whose utilization rate was low in the past. Can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of a gas turbine power generation facility showing a first embodiment of the present invention.

FIG. 2 is a schematic system diagram of a gas turbine power generation facility showing a second embodiment of the present invention.

FIG. 3 is a schematic system diagram showing a conventional example of a gas turbine power generation facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel gas supply pipe 2 ... Fuel pressure reduction heating device 3 ... Pressure reduction valve 6 ... Gas turbine 6a ... Air compressor 6b ... Turbine 7 ... Combustor 8 ... Generator 9 ... Fuel gas heating device 20 ... Hot water cleaning device 21 ... Water supply system 22 ... Heating device 23 ... Washing hot water tank 24 ... Washing hot water pump 25 ... Washing water supply pipe 26 ... Washing water stop valve 30,35 ... Hot water supply pipe 31 ... Supply stop valve 32 ... Hot water return pipe 33 ... Second Heating device 34 ... Hot water circulation pump

Claims (3)

[Claims] 1. The fuel supplied to a gas turbine is heated,
In a gas turbine power generation facility having a fuel pressure reducing heating device for reducing pressure and a hot water cleaning device for supplying cleaning hot water to an air compressor for compressing air supplied to a gas turbine, the hot water cleaning device and the fuel pressure reducing heating device A gas turbine power generation facility, wherein the supplied hot water is guided from a common hot water tank. 2. The gas turbine power generation equipment according to claim 1, wherein the hot water supplied to the fuel pressure reducing / heating device is guided from a downstream side of a cleaning hot water pump that guides the cleaning hot water to the gas turbine. . 3. The hot water supplied to the fuel pressure reducing and heating apparatus is guided from a upstream side of a cleaning hot water pump that guides the cleaning hot water to a gas turbine via a hot water circulation pump. The gas turbine power generation equipment as described.