JP3346830B2 - Gas turbine enclosure ventilation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas turbine enclosure ventilation system.

[0002]

2. Description of the Related Art A conventional gas turbine enclosure ventilation system will be described with reference to FIG.

[0003] Combustion gas passes through an intake muffler 32 from an intake filter 31 and passes through a compression section 3 in an enclosure 33.
4 is introduced. The combustion gas is compressed by the compression section 34 and supplied to the combustion section 35. The gas burned in the combustion section 35 is sent out from the gas exhaust passage 36 to the outside.

Meanwhile, heat is generated inside the enclosure 33 by the combustion of the combustion gas. For this reason, cooling in the enclosure 33 is necessary, and an air introduction passage 37 for introducing cooling air is provided between the intake filter 31 and the enclosure 33.

A ventilation fan 38 is provided in the passage of the air introduction passage 37. The cooling air is taken in from the intake filter 31 and sent into the enclosure 33 by the function of the ventilation fan 38. The air sent into the enclosure 33 travels in the arrow direction Y along the compression section 34 and the combustion section 35 to cool the inside of the enclosure 33. Then, the air is discharged from the air exhaust passage 39.

[0006]

In the conventional apparatus, a ventilation fan 38 is used to take in cooling air.
Therefore, if the ventilation fan 38 fails during the operation of the gas turbine, the cooling in the enclosure 33 is not performed. As a result, the temperature inside the enclosure 33 rises, hindering the operation of equipment used for measurement and control of the gas turbine, and the reliability is reduced.

[0007] Further, the ventilation fan 38 must be driven from the start to the stop of the gas turbine, which poses a problem from the viewpoint of energy saving.

[0008] It is an object of the present invention to provide a gas turbine enclosure ventilator that limits the time during which a ventilation fan is driven, improves reliability, and saves energy.

[0009]

A ventilating apparatus for a gas turbine enclosure according to the present invention includes a compression section for compressing a combustion gas, a combustion section for burning the compressed combustion gas, and surrounding the compression section and the combustion section. An enclosure, a gas exhaust path for exhausting gas burned in the combustion section, air for cooling the inside of the enclosure, a first air introduction path having a ventilation fan in the passage, and air for cooling the inside of the enclosure. A second air introduction path through which no ventilation fan is provided in the passage, an air exhaust path for exhausting air cooled in the enclosure, a communication path connecting the air exhaust path and the gas exhaust path, A first switching damper for switching one of the second air introduction paths to open and the other to close;
And a second switching damper opening and closing the communication path, before
The first switching damper closes the first air introduction passage.
And the communication by the second switching damper
It is characterized by opening the road.

[0010]

According to the above arrangement, two air introduction paths are provided to supply cooling air to the enclosure, and one of the air introduction paths is provided with a ventilation fan. Until the combustion gas enters a combustion state, the ventilation fan is driven to send cooling air to the enclosure by the function of the ventilation fan.

When the combustion gas enters a combustion state, a gas exhaust path for exhausting the burned gas and an air exhaust path for exhausting the cooled air are connected by a communication path. Then, utilizing the pressure drop in the gas exhaust passage due to the flow of the burned gas, cooling air is taken into the enclosure using an air introduction passage without a ventilation fan.

Accordingly, in the combustion state of the combustion gas, it is not necessary to operate the ventilation fan for taking in the cooling air.

Therefore, it is possible to prevent a reduction in reliability due to a failure of the ventilation fan and a waste of energy due to a long-time operation of the ventilation fan.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram, and FIG.
FIG. 4 is a diagram showing an operation flow.

First, as shown in FIG. 2A, when a start instruction (21) for the gas turbine is issued, the ventilation fan is simultaneously driven (22).

[0016] In response to a start instruction for the gas turbine, as shown in FIG. The combustion gas is compressed by the compression unit 3 and supplied to the combustion unit 4. Then, the fuel is ignited by the combustion part 4 and enters a combustion state. The burned gas is exhausted from the gas exhaust path 5.

The compression section 3 and the combustion section 4 are surrounded by an enclosure 6 in order to reduce noise generated there.

By the way, the ventilation fan 7 is driven by the start instruction to the gas turbine. Then, by the function of the ventilation fan 7, cooling air is taken in from the intake filter 1 and sent into the enclosure 6 through the first air introduction passage 8. The cooling air sent into the enclosure 6 travels in the arrow Y direction along the compression section 3 and the combustion section 4, and the enclosure 6 such as the compression section 3 and the combustion section 4.
Cool the inside. The air that has cooled the inside of the enclosure 6 is discharged from the air exhaust passage 9 to the outside. The air exhaust passage 9 is connected to the gas exhaust passage 5 by a connecting passage 10.
It is connected to.

By the way, when the ignition is completed (23) as shown in FIG. 2 (b), it is provided in the first air introduction passage 8 and the air exhaust passage 9 by a command from a control panel (not shown). Switching of the switching dampers 10 and 11 is performed (24) (2)
5). Then, the ventilation fan 7 is stopped (26).

The switching dampers 11, 12 (FIG. 1)
The state changes from a solid line to a dotted line. By this switching, the passages of the first air introduction passage 8 and the air exhaust passage 9 are closed. Then, the second air introduction path 13 branched from the first air introduction path 8 and the communication path 10 connecting the air exhaust path 9 and the gas exhaust path 5 are opened.

In the combustion state of the combustion gas, the burned exhaust gas is exhausted from the gas exhaust passage 5. that time,
The exhaust gas rises in the exhaust path 5 at a considerable speed, and the exhaust path 5
The pressure inside decreases. As a result, the cooled air is sucked into the exhaust path 5 from the communication path 10 and discharged together with the exhaust gas.

The decrease in the pressure in the exhaust passage 5 acts to take cooling air from the intake filter 1 into the second air introduction passage 13. Therefore, the second air introduction path 1
The cooling air can be taken into the enclosure 6 even if there is no ventilation fan in the passage 3.

Next, as shown in FIG. 2C, when there is a stop command (27) to the gas turbine, the ventilation fan is started (28). Then, the switching dampers 11 and 12 are switched (29) (30), and the gas turbine is tripped (31).

By switching the switching dampers 11 and 12,
The switching dampers 11 and 12 change from the state of the dotted line in FIG. 1 to the state of the solid line, and return to the state before ignition of the combustion gas.

In the above-described embodiment, two air introduction paths for sending cooling air into the enclosure are configured such that one is branched from the other. However, the two air introduction paths may be provided independently. In this case, a switching damper is provided in each air introduction path, and each switching damper is simultaneously controlled according to the operation state of the gas turbine, so that one air introduction path is open and the other air introduction path is closed. It will be controlled to the state.

[0026]

According to the present invention, the reliability of the gas turbine enclosure ventilation system can be improved and energy can be saved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of one embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake filter 2 ... Intake silencer 3 ... Compression part 4 ... Combustion part 5 ... Gas exhaust path 6 ... Enclosure 7 ... Ventilation fan 8 ... First air introduction path 9 ... Air exhaust path 10 ... Communication path 11, 12 ... Switching Damper 13: Second air introduction path

Claims (1)

(57) [Claims] 1. A compression section for compressing combustion gas, a combustion section for burning the compressed combustion gas, an enclosure surrounding the compression section and the combustion section, and a gas exhaust for exhausting gas burned in the combustion section. A first air introduction passage through which the air for cooling the inside of the enclosure is passed, and a ventilation fan is provided in the passage; and a second air introduction passage through which the air for cooling the inside of the enclosure is provided without the ventilation fan, An air exhaust path for exhausting air that has cooled the inside of the enclosure, a communication path connecting the air exhaust path and the gas exhaust path, and opening one of the first and second air introduction paths and closing the other. A first switching damper for switching, and a second switching damper for opening and closing the communication path , wherein the first switching damper is provided.
When the first air introduction passage is closed by a damper
Then, the communication path is opened by the second switching damper.
A gas turbine enclosure and ventilator.