JPH0326274Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to gas turbine equipment, and particularly to a gas turbine in which an unburned gas discharge pipe is attached to the exhaust duct to improve safety and economic efficiency. Regarding equipment.

[Technical background of the invention]

Generally, a gas turbine device used in a power generation plant has an air compressor 1 as shown in FIG.
, a combustor 2 , a gas turbine 3 , and a generator 4 , and the fuel led by a fuel supply pipe 5 passes through a fuel stop valve 6 and a fuel control valve 7 and is combusted from a fuel injection device 8 of the combustor 2 . The fuel is injected into the room, mixed with compressed air supplied from the air compressor 1, and ignited by the ignition device 9. The high-temperature, high-pressure gas generated by the combustion is fed to the gas turbine 3 that drives the generator 4 and the air compressor 1, and after giving rotational drive work to the gas turbine 3, it passes through the exhaust duct 10 as it is. , or other exhaust heat recovery equipment, and then released to the atmosphere.

Light oil and kerosene have long been used as fuel, but recently they have become cheap and
Liquefied petroleum gas (LPG) and liquefied natural gas (LNG), which generate less _NO Things are becoming more and more common.

[Problems with background technology]

However, due to the structure of the building, the main body of the gas turbine device is often installed on the second floor, and the exhaust duct 10 is installed so as to be temporarily lowered from the second floor to the first floor. In such exhaust duct descending type gas turbine equipment, if liquefied petroleum gas fuel (hereinafter referred to as LPG fuel), which is heavier than air, is used,
A large amount of unburned gas may remain in the exhaust duct 10 when fuel ignition fails.

In other words, conventionally, when ignition fails, high-pressure air from the air compressor 1 is introduced into the combustor 2, and unburned gas is purged out of the combustor along with the air. If the specific weight becomes larger than air, the air will be discharged outside the vessel, but unburned gas will flow into the exhaust duct 10 through the gas turbine 3, making it impossible to perform sufficient purging. It was closed.

Once unburned gas accumulates in the exhaust duct 10, even if compressed air is fed into the exhaust duct 10 through the gas turbine 3, the unburned gas remains due to the weight ratio and the shape of the exhaust duct 10. It takes a very long time to completely purge the gas, and there is a risk of explosion or fire.Furthermore, the shutdown state lasts for a considerable period of time, making the operating economy extremely poor.

[Purpose of invention]

Therefore, the present invention eliminates these drawbacks of conventional gas turbine equipment and quickly purges unburned LPG gas that remains in the exhaust duct when ignition fails, improving safety and economy. It is an object of the present invention to provide a gas turbine device that has a high temperature.

[Summary of the idea]

In order to achieve the above object, the gas turbine device according to the present invention connects the exhaust duct of the gas turbine with an unburned gas exhaust pipe that leads out the unburned gas accumulated in the exhaust duct, and discharges the unburned gas. In a gas turbine device using liquefied petroleum gas, a stop valve is installed in the middle of a pipe, and a blower is provided for forcibly discharging unburned gas remaining in the exhaust duct to the outside when the stop valve is opened. At least two unburned gas exhaust pipes are provided that open at the bottom and the rising end of the lower installed portion of the exhaust duct, and a stop valve and a blower respectively incorporated in each unburned gas exhaust pipe are set to a timer. The system is configured to be controlled by a controller that outputs an operating signal based on the gas turbine ignition command signal and the unburned signal of the combustor, and thereby opens the stop valve and starts the blower in the event of ignition failure, thereby opening the exhaust duct. The unburned gas inside the tank is forcibly exhausted from at least two locations and at the most optimal time via a timer.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 2 and 3.

As shown in FIG. 2, in which the same components as in FIG.
2 are connected. This unburnt gas exhaust pipe 21,
22 are installed with openings at the rising end and the bottom of the lower installed portion of the exhaust duct 10 where unburned LPG gas tends to accumulate, and stop valves 23 are installed in the middle in order from the exhaust duct 10 side. ,2
4 and blowers 25 and 26, respectively.

Then, the stop valve 23 is opened and the blower 25 is opened.
By starting the stop valve 24 and starting the blower 26, from the unburned gas exhaust pipe 22 opened at the bottom by opening the stop valve 24 and starting the blower 26. Each exhaust duct 10 is configured to release unburned gas remaining in the exhaust duct 10 to the atmosphere.

Furthermore, these stop valves 23, 24 and the blower 2
5 and 26 are operated by a control signal from a controller 28 which receives an ignition command signal S ₁ and a combustion signal S ₂ from a fire detector 27 provided in the combustor 2 . As shown in FIG. 3, this controller 28 includes a timer 29 and a NOT circuit 30 that receive the ignition command signal _S1 and the combustion signal _S2, respectively, and also receives output signals from the timer 29 and the NOT circuit 30. It is provided with an AND circuit 33 for receiving the signal.

The timer 29 is set with a signal delay time of, for example, about one minute, from when the ignition command signal S ₁ is issued until the ignition device ₉ is completely activated. , is applied to the AND circuit 33 with a delay of the time set by the timer 29. Furthermore, the fire detector 27 does not emit any signal when combustion is not occurring in the combustor 2, but when ignition is performed and combustion begins, the fire detector 27 detects the light and color of the fire. The combustion signal _S2 is output to the NOT circuit 30. Therefore, the unburned signal _S3 is sent from the NOT circuit 30 to the AND circuit 33 when combustion is not performed.
No signal is generated during combustion.

Then, the ignition command signal S ₁ and the unburned signal S ₃
is applied to the ANG circuit 33, that is, when the combustor 2
When combustion is not occurring despite the ignition command being issued to the AND circuit 33, the stop valve 23,
24 and the blowers 25, 26, the stop valves ₂₃ , 24 are opened, and the blowers 25, 26 are activated.

In addition, timers 34 and 35 are provided in the middle of each transmission circuit for the operation signal _S4 , and one of the timers 34 controls the stop valves 23 and 24.
to the blower 25, by the other timer 35.
The output time of the actuation signal _S4 to 26 can be set arbitrarily. Then, after a certain period of time has elapsed, the output of the actuation signal _S4 is
It is cut by 5.

In addition, the setting time of these timers 34 and 35 is as follows.
It is set to the time required to purge unburned gas in the exhaust duct 10.

In a gas turbine device using LPG fuel having such a configuration, when ignition of the combustor 2 fails during startup, unburned LPG fuel gas tends to stay in the exhaust duct 10, but the controller 28 The actuation signal S ₄ from the stop valve 2
The three and twenty-four blowers 25 and 26 are opened and activated, and the unburned gas remaining in the exhaust duct 10 is discharged to the outside through the unburned gas discharge pipes 21 and 22.

At this time, the unburned gas discharge pipes 21 and 22 open at the bottom and the rising end of the lower installed part of the exhaust duct 10, respectively, so that the unburned gas that is heavy and tends to accumulate at the bottom and the exhaust duct are removed. 10 is bent at an almost right angle, it is possible to actively purge unburned gas that accumulates at the rising end where stagnation occurs and is most difficult to purge. Discharge pipe 21, 2
2 can be arbitrarily and individually set, thereby allowing unburned gas to be purged more quickly in accordance with various shapes of the exhaust duct 10.

[Effect of idea]

Since the present invention has the above configuration, LPG
Even if unburned gas attempts to remain in the exhaust duct due to ignition failure during startup of a gas turbine device using fuel, this unburned gas is immediately purged from the exhaust duct through at least two unburned gas exhaust pipes. As a result, the fear of explosion or fire in the gas turbine device can be quickly eliminated, and safety can be sufficiently ensured.

Furthermore, the time during which the operation is stopped for purging can be shortened as much as possible, and economical operation without waste can be performed.

[Brief explanation of drawings]

FIG. 1 is a system explanatory diagram of a general gas turbine apparatus, FIG. 2 is a system explanatory diagram of a gas turbine apparatus according to an embodiment of the present invention, and FIG. 3 is a circuit explanatory diagram of a controller. DESCRIPTION OF SYMBOLS 1...Air compressor, 2...Combustor, 3...Gas turbine, 5...Fuel supply pipe, 10...Exhaust duct, 21,
22...Unburned gas discharge pipe, 23, 24...Stop valve, 2
5, 26... Blower, 27... Fire detector, 28... Controller, 29, 34, 35... Timer, 30...
NOT circuit, 33...AND circuit.

Claims (1)

[Scope of utility model registration request] An unburned gas exhaust pipe for discharging unburned gas remaining in the exhaust duct to the outside is connected to the exhaust duct of the gas turbine, a stop valve is installed in the middle of this unburned gas exhaust pipe, and the stop valve is opened. In a gas turbine device using liquefied petroleum gas, which is equipped with a blower that forcibly discharges unburned gas remaining in the exhaust duct to the outside when At least two unburned gas discharge pipes each open, a stop valve and a blower incorporated in each unburned gas discharge pipe, each equipped with a timer, based on a gas turbine ignition command signal and a combustor unburned signal. A gas turbine apparatus characterized in that the gas turbine apparatus is configured to be controlled by a controller that outputs an operation signal.