JPH0222219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas turbine power generation device.

[Conventional technology and its issues]

In general, gas turbine noise is different from diesel engines, etc., as it is a rotating machine and continuous combustion, so there is little vibration noise, and the noise is caused by the flow of large amounts of gas or air and the blades of the compressor and turbine. The generated pressure noise is the main one, and there are many high frequency components. Such high-frequency noise is emitted to the outside of the machine at the compressor suction section and gas turbine exhaust section.

In order to suppress such high-frequency noise as much as possible, a cubicle-type gas turbine power generation device is known in which air intake ports for intake air and for cooling a generator, etc. are combined into one.

However, in the case of such a device, the air intakes for intake and cooling are combined into one, so the number of openings is reduced and the leakage of high-frequency noise is reduced. Since the intake passage is no longer dedicated, it can be used for internal inspection during gas turbine operation.
If the door of the package cage is suddenly opened and closed, the air pressure inside the package will fluctuate, and this fluctuation will cause the intake pressure of the gas turbine intake duct to fluctuate.
At low rotation speeds of the gas turbine, severe pressure fluctuations are induced in the centrifugal compressor, ie, a surging phenomenon is caused, which may make it difficult to maintain operation of the compressor.

[Means to solve the problem]

Therefore, the present invention was created in an attempt to solve these conventional inconveniences.The gist of the present invention is to provide a gas turbine power generation system in which a gas turbine equipped with a compressor and a generator are directly connected, and the whole is surrounded by a package. An air intake for intake and cooling is provided on the front surface of the package on the side where the generator is installed, and the combustor and exhaust pipe of the gas turbine are made to protrude from the rear surface of the package. A gas turbine power generator is provided with an opening/closing door on one side, and an air passage connected to the air intake port over the entire length of the package ceiling, and the air passage is connected to the air intake port. A first sound absorbing device facing the inlet side and a second sound absorbing device provided in the deep part of the air passage and communicating with the intake duct that supplies intake air to the gas turbine are built in series via a dividing wall. The exit side of the first sound absorbing device is divided by the dividing wall into a portion communicating with the second sound absorbing device and a portion communicating with the first opening for cooling air, and the generator is connected to the first opening. A gas turbine power generation device is characterized in that cooling air is caused to flow down.

〔Example〕

Hereinafter, the structure of the present invention will be explained in detail with reference to the embodiments shown in FIGS. 1 and 2. In this example, 2
This is a single-shaft type gas turbine power generation device, and is particularly an emergency gas turbine power generation device used in a hospital or the like during a power outage.

1 is a gas turbine (the other one is not shown), 2
is a generator and is placed on a common base 3. Reference numeral 4 denotes a package for the entire enclosure (cubicle), and an air intake 5 for intake air and outside air for cooling the generator, etc. is provided on the front side of the package 4 on the side where the generator 2 is installed. An exhaust coupling pipe 6 is provided on the rear surface of the engine. An intake passage 7 that communicates with this air intake port 5 is provided along the entire length of the ceiling of the package 4, and this intake passage 7 has a
As shown in Fig. 2, a first sound absorbing device is built in which has two stages of splitters 9 with sound absorbing plates 8 and 8 arranged side by side, and a second sound absorbing device with one stage of similar splitters 9 is installed at the back of the first sound absorbing device. Built-in sound absorbing device. A first opening 10 is formed between these splitters 9, 9, and the outside air flowing through the intake passage 7 is divided by a dividing wall.
A portion of the divided airflow is caused to flow down through the first opening 10 as a first airflow A1, and is introduced into the upper part of the generator 2. Further, a buff-full plate 11 that straddles the generator 2 is suspended from the outer lower surface of the intake passage 7, and the outside air introduced onto the generator 2 is circulated as shown by the first arrow in the figure.

Reference numeral 12 denotes an air intake duct to the gas turbine 1, and this air intake duct 12 allows a second air flow A2 to flow downstream from a second opening 13 opened near the inner end of the air intake passage 7.

Reference numeral 14 denotes a lubricating oil oil cooler, and this oil cooler 14 is provided at the end of the intake passage 7, and allows the third air flow A3 of outside air flowing through the intake passage 7 to flow therethrough. In addition, blocking plates 19, 19', 19'' (Fig. 2) are provided on both sleeves and the upper and lower parts of the oil cooler 14, so that the first air flow A flowing down from the first opening 10 can be blocked.
1 cools the gas turbine 1 and the like, a part of it floats through the third opening 15 by the shielding plate 19 and flows through the oil cooler 14. The remainder of the first airflow A1 is controlled by the blocking plate 19'',
The air is bypassed under the common platform 3 via the vent 16 and flows out to the above-mentioned exhaust coupling pipe 6.

A combustor 17 and an exhaust pipe 18 of the gas turbine 1 are inserted in parallel into the exhaust coupling pipe 6, and a diff user 20 faces the exhaust pipe 18. This differential user 20 is provided protruding from a flue 21 having a built-in silencer (not shown). Therefore, the first air flow A1 and the third air flow A
3 are both the exhaust pipe 18 and the differential user 20.
It is attracted by the ejector effect.

In addition, 21 is a fuel supply pipe, 22 is a lubricating oil pipe, 23 is a wire mesh (corresponding to a general air cleaner),
Reference numeral 24 indicates a sideways exhaust port, and the inside of the package cage 4 is lined with soundproofing material such as glass wool.

To describe the operation of this embodiment, the air flow is sucked through the air intake port 5, and the suction is performed by the ejector effect of the exhaust pipe 18 and the diffuser 20. Of course, a suction fan may also be used. The outside air sucked through the air intake port 5 flows through the outer periphery and inside of the generator 2 as a first air flow A1, and then passes through the outer periphery of the gas turbine 1 to cool each of them. The first cooling gas turbine 1
The air flow A1 is divided, a part of which flows through the oil cooler 14, and the other part of which detours under the common platform 3.
They merge again and are sucked by the diffuser 20. The second airflow A2 is drawn into the intake duct 12 via the first and second sound absorbers.

Therefore, high frequency noise emitted from the compressor of the gas turbine 1 is not emitted from the air intake port 5.

In addition, since the first air flow A1 and the second air flow A2 are clearly separated, a door-type opening/closing door (see Fig. Even if the air flow (not shown) is suddenly opened or closed, it has no effect on the second air flow A2 in the intake passage 7 and does not affect its air pressure. The pressure does not fluctuate, and the intake air amount of the gas turbine 1 is maintained constant.

Note that the third air flow A3 is connected to the oil cooler 14.
It joins with the first air flow A1 via the diffuser 20 and is muffled by a silencer, while
It is released into the atmosphere through a high flue 21.

〔Effect of the invention〕

According to the present invention, since the air intake port is placed on the front side of the package, and the combustor and exhaust pipe are placed on the rear side,
A relatively long intake passage can be formed over the entire length of the ceiling in the longitudinal direction of the package.Therefore, a dividing wall can be interposed between the first sound absorbing device and the second sound absorbing device provided in series. Due to the dividing wall,
On the exit side of the first sound absorbing device, the flow through the first opening for cooling air and the flow through the intake duct can be clearly distinguished. Therefore, when the opening/closing door provided on the package cage is suddenly opened or closed, pressure fluctuations are transmitted to the first opening, and this pressure fluctuation is caused by the air flowing from the part of the first sound absorbing device that communicates with the first opening for cooling air. Although the air pressure fluctuations are propagated toward the intake, the air pressure fluctuations have no effect on the air intake duct that supplies air to the gas turbine.

Therefore, even when performing maintenance inspections on the gas turbine during operation, stable performance can be maintained at all times without surging occurring in the compressor due to sudden door openings and closings, and fluctuations in power generation output and frequency can be avoided. These fluctuations can be prevented while suppressing the emission of high-frequency noise by combining the air intake ports for intake air and cooling air into one.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along arrows A--A in FIG. DESCRIPTION OF SYMBOLS 1... Gas turbine, 2... Generator, 4... Package, 5... Air intake, 8, 8... Sound absorption plate, 9... Splitter, 10... First opening, 12... Intake duct,
13...Second opening, 17...Combustor, 18...Exhaust pipe, 20...Diffusion user.

Claims (1)

[Scope of Claims] 1. In a gas turbine power generation device in which a gas turbine equipped with a compressor and a generator are directly connected and the entire body is enclosed in a package, an air intake is provided on the front surface of the package on the side where the generator is disposed. An air intake port for combined cooling is provided, the combustor and exhaust pipe of the gas turbine are made to protrude from the rear surface of the package, an opening/closing door is provided on one side of the package, and a door is provided on the ceiling of the package over its entire length. A gas turbine power generation device is provided with an air passage connected to the air intake, and a first sound absorbing device is provided in the air passage, the inlet side of which faces the air intake, and a first sound absorbing device is provided in the inner part of the air passage. A second sound absorbing device that communicates with an intake duct that supplies intake air to the gas turbine is built in series through a dividing wall, and the outlet side of the first sound absorbing device is
It is characterized by being divided by the dividing wall into a part communicating with the second sound absorbing device and a part communicating with the first opening for cooling air, and cooling air for the generator etc. flows down from the first opening. Gas turbine power generation equipment.