JPH06193464A - Gas turbine highly efficient exhaust heat recovery type power plant - Google Patents

Abstract

(57) [Summary] [Structure] Exhaust ducts 23, 33, 43, 5 for exhausting ventilation air connected to the auxiliary equipment room 21, the gas turbine room 31, the load gear room 41, and the generator room 51 of the gas turbine power generation facility.
4, pure water heat exchangers 24, 34, 44, 55 are provided, and pure water is passed through the pure water heat exchanger to supply heat to the heat recovery boiler 61, so that the tip of the exhaust duct is halfway through the building wall 1. The wall hole is opened to a size larger than the shape of the exhaust duct tip, and ventilation air 99 is ejected to draw the building air 98 to the outside. [Effect] Since the temperature of the pure water supplied to the exhaust heat recovery boiler is raised, the amount of steam generated is increased and the building ventilation fan can be omitted, so that the power consumption of auxiliary machinery is eliminated and the plant efficiency 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 high efficiency exhaust heat recovery power generation facility.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 1 shows the overall configuration of a conventional heat recovery power generation facility. Normally, the gas turbine auxiliary equipment room 21, the gas turbine room 31, which constitute the main body in consideration of maintenance and inspection,
The load gear chamber 41 and the generator chamber 51 are installed in the building 10, and the gas turbine combustion air is guided from the combustion air intake chamber 11 provided outside the building to the gas turbine chamber by the intake duct 12. After combustion, the hot exhaust gas, which has worked, passes through the exhaust heat recovery boiler 61 connected to the gas turbine chamber and passes through the chimney 71.
Released into the atmosphere. In each room, when equipment operates, heat is generated and the temperature inside becomes high. To prevent this, the gas turbine auxiliary machine room, gas turbine room and load gear room are
Ventilation blowers 22, 32, 42 that suck the air in the building 10.
Is attached to each room, and the generator room is a blower attached to the generator rotor, and is guided to the generator room from the air suction chamber 52 installed outside the building by the suction duct 53. The air sucked by each blower cools each room, and each exhaust duct 23,
It is released outside the building at 33, 43, and 54.

FIG. 2 is a sectional view of a gas turbine room and a building. For ventilation of the gas turbine room, the ventilation blower 32 attached to the lower part of the room sucks in the air 98 in the building, cools the room to remove heat, and discharges it to the outside of the building in the exhaust duct 33. Also, inside the building, hot air leaks out from each room, and solar heat enters through the building wall 1 and windows, causing it to reach a high temperature.
This will cause a failure of the overhead crane 4. For this reason, the louver 2 is provided in the lower part of the wall of the building, and the building ventilation fan 3 is provided at several places on the roof so that the air 98 outside the building is forcibly taken in and the temperature is kept at 65 ° C or less at the maximum. Since the ventilation blower of the gas turbine room is attached to the lower part of the building, it is in a relatively low temperature state even if it takes in air inside the building.

Japanese Patent Laid-Open Publication No. Sho
Although there is a 59-128922 publication, it is a very expensive and uneconomical facility equipped with an air conditioner.

[0005]

The thermal efficiency of the gas turbine exhaust heat recovery power generation facility is such that the heat quantity per unit time of the supplied fuel is the denominator, and the power at the power transmission end and the steam quantity generated in the exhaust heat recovery boiler are calorific values. It is the value obtained by dividing by the numerator converted to. This is because the thermal efficiency is usually about 60%, and the remaining 40% is exhausted without sufficient use or consumes electric power as power for useless ventilation.

An object of the present invention is to effectively use the exhaust heat of ventilation air for cooling a gas turbine or a generator, and to forcibly discharge the air inside the building to the outside with the energy released from the ventilation air.
It is to abolish the building ventilation fan.

[0007]

[Means for Solving the Problems] A gas turbine auxiliary equipment room, a gas turbine room, which constitutes a main body of a gas turbine power generation facility,
The load gear room and the generator room are equipped with exhaust ducts for ventilation, and exhaust to the outside of the building. Each exhaust duct is equipped with a heat exchanger, and the boiler feed pump is connected to this heat exchanger by dividing the piping for sending pure water to the exhaust heat recovery boiler into four systems.
Heat pure water.

The tip of the outlet side exhaust duct of the heat exchanger should be halfway through the wall of the upper part of the building, the wall drilling should be opened larger than the shape of the tip of the exhaust duct, and the air in the exhaust duct should be ejected to serve as an ejector. Let

[0009]

The temperature of each room constituting the main body is determined by the heat resistance of the equipment and the workability of the operator, but is usually around 60 to 80 ° C. On the other hand, the inlet temperature of pure water passing through the heat exchanger is about 1
If it is heated to 0 to 20 ° C. by the exhaust gas of the chamber and supplied to the exhaust heat recovery boiler, the evaporation amount is increased and the plant thermal efficiency is improved.

Further, since the exhaust ducts from each room are arranged at intervals of four places in the longitudinal direction of the building, if the roof is made a sloping slope and the exhaust duct is raised in the direction in which the exhaust duct extends, the most heated interior of the building. Air is pulled outside the building due to the ejector effect at the tip of the exhaust heat duct. This eliminates the need for several building ventilation fans that were conventionally installed on the roof, thus reducing wasteful power consumption and improving plant efficiency.

[0011]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 3 shows the overall configuration according to the present invention. Normally, the gas turbine auxiliary equipment room 21 and the gas turbine room 3 which constitute the main body of the exhaust heat recovery type power generation equipment
1, the load gear chamber 41 and the generator chamber 51 are installed in the building 10 in consideration of maintainability, but the combustion air of the gas turbine is taken from the combustion air intake chamber 11 provided outside the intake duct 12 Led to the gas turbine room. The combustion air, after being burned in the gas turbine 34, works and becomes exhaust gas, which passes through the exhaust heat recovery boiler 61 connected to the gas turbine chamber and is discharged into the atmosphere at the chimney 71. In each room, when equipment is operated, heat is generated and the temperature of the room becomes high. Therefore, in order to prevent this, the gas turbine auxiliary machine room, the gas turbine room, and the load gear room have a ventilation blower that sucks the air 98 in the building 10. Two
2, 32 and 42 are attached to each room, and the generator is a blower attached to the generator rotor, and the outside air is guided to the generator room from the air suction chamber 52 installed outside the building through the suction duct 53. The air 99 sucked by each blower cools each room and is guided to the outside by each exhaust duct 23, 33, 43, 54, and the pure water heat exchangers 24, 3 are provided in the middle of each exhaust duct.
4, 44 and 55 are provided, and the pure water 83 in the pure water tank 81 is supplied by the boiler feed pump 82 through the heat exchanger for pure water through the pipe 84 and supplied to the exhaust heat recovery boiler. The temperature of the air flowing out from each chamber to the exhaust duct varies depending on the flow rate of the air to be ventilated, but it is about 60 ° C to 80 ° C as an economical design. On the other hand, the temperature of pure water is about 10 to 2 at the boiler feed pump outlet.
Since the temperature is 0 ° C., if the pipe is branched into four and the amount of pure water according to the heat exchange amount of each heat exchanger is distributed, the pure water is heated to 5 to 10 ° C. and enters the boiler, so that the thermal efficiency is improved.

FIG. 4 is a sectional view of the gas turbine room and the building. Ventilation of the gas turbine room 31 takes in the air 98 in the building with a ventilation blower 32 attached to the lower part of the room,
After cooling the gas turbine 38 and the room to remove heat to enter the pure water heat exchanger 34, heat the pure water, and then bend at a right angle to pass through the climbing wall up to the ceiling of the building, and from there the exhaust duct Squeeze the cross-section area to finish the tip in the building wall 1.

The hole on the wall side is made slightly larger than the outer dimension of the exhaust duct, and the edge of the hole is exposed to the outdoor side of the building more than the tip of the duct. Pull out to. The outdoor air 98 is generated by the ventilation blower and the ejector effect of exhaust.
It flows in from the louver 2 attached to the lower part of the building, cools the surface of each room, the crane 4 on the ceiling, and the inside of the building, rises by being heated, and is collected to the ejector section at the inclination of the ceiling. Since the ejector is the outlet of the exhaust duct, four ejectors can be provided in the longitudinal direction of the building, so it is possible to sufficiently ventilate the entire building. Louvers will be installed between columns under the walls on both sides of the building in the longitudinal direction.

FIG. 5 is a detailed view of the pure water heat exchanger. Since the structure of the pure water heat exchanger is the same, the pure water heat exchanger in the gas turbine chamber is shown as a representative. The pure water 83 pressurized by the boiler water supply pump is supplied to the heat exchanger sewage chamber 3 through the pipe 84 branched from the mother pipe.
5, the pure water passes through the tube 37 connecting the lower surface and the upper surface of the exhaust duct 33, and enters the heat exchanger water supply chamber 36. On the other hand, the air 99 that has ventilated the chamber flows into the tubes constituting the heat exchanger through the exhaust duct, exchanges heat with the surfaces of the innumerable tubes, and is released into the atmosphere through the exhaust duct. Further, the pure water in the upper water chamber of the heat exchanger is collected together with other pure water lines by a pipe and sent to the exhaust heat recovery boiler.

[0015]

EFFECTS OF THE INVENTION According to the present invention, (1) The ventilation air in the room surrounding the main body of the gas turbine power generation facility has not been conventionally used and is released to the atmosphere. However, the heat energy of the ventilation air is discharged to the exhaust heat recovery boiler. By heating the pure water supplied by, the amount of steam is increased and the thermal efficiency is improved.

(2) In order to ventilate the interior of the building, several building ventilation fans have been provided, but the ejector is activated by the tip of the exhaust duct that ventilates the main body to discharge the warmed air inside the building. As a result, the building ventilation fan can be omitted and the power consumption will be eliminated.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a conventional exhaust heat recovery power generation facility.

FIG. 2 is a sectional view of a conventional gas turbine room and a building.

FIG. 3 is an overall system diagram according to the present invention.

FIG. 4 is a sectional view of a gas turbine room and a building according to the present invention.

FIG. 5 is an explanatory view of a pure water heat exchanger according to the present invention.

[Explanation of symbols]

1 ... Building wall, 2 ... Louver, 11 ... Combustion air intake room, 12
... Taking duct, 21 ... Gas turbine auxiliary equipment room, 22 ... Ventilation blower, 23 ... Exhaust duct, 24 ... Pure water heat exchanger, 3
1 ... Gas turbine room, 32 ... Ventilation blower, 33 ... Exhaust duct, 34 ... Pure water heat exchanger, 41 ... Road gear room, 4
2 ... Ventilation blower, 51 ... Generator room, 55 ... Pure water heat exchanger, 81 ... Pure water tank, 82 ... Boiler feed pump, 84
…Piping.

Claims (2)

[Claims] 1. A gas turbine auxiliary equipment room, a gas turbine room, a load gear room, which constitute a gas turbine power generation facility, in a building.
In a gas turbine generator ventilation facility, where a generator room is installed and each room is equipped with a ventilation blower and an exhaust duct,
A gas turbine high-efficiency exhaust heat recovery power generation facility, wherein a heat exchanger for pure water for supplying water to a gas turbine exhaust heat recovery boiler is provided in each of the exhaust ducts. 2. The exhaust duct according to claim 1, wherein a tip of each of the exhaust ducts is partway through a wall of a building, a wall hole is opened larger than a tip shape of the exhaust duct, and air in the exhaust duct is ejected. Gas turbine high efficiency exhaust heat recovery power generation equipment.