JPS599738B2 - Gas turbine starting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to gas turbine power generation equipment, and relates to an improvement of a starting device equipped with a starter.

Generally, the configuration of gas turbine power generation equipment is as shown in Fig. 1, in which a gas turbine 1, a compressor 2, and a generator 3 are directly connected on the same axis.
The starter 6 is directly connected to the starter 6 via the torque converter 5.

The gas turbine 1 can be supplied with combustion gas obtained by mixing and burning compressed air and fuel from the compressor 2 in a combustor 7.

In such a configuration, when combustion gas is supplied to the gas turbine 1, the energy of the combustion gas is converted into mechanical driving force, and this mechanical driving force is applied to the compressor 2.
and is spent driving the generator 3.

When the gas turbine 1 is started, the compressor 2 needs to be driven from the outside because the gas turbine 1 is not yet generating driving force.

A starter 6 is installed for this purpose, and usually an electric motor, diesel engine, or the like is used.

On the other hand, the load on the starter 6 at startup is reduced, the speed increases smoothly, and the auxiliary equipment of the gas turbine 1 is controlled by the rotation speed.In other words, high torque is transmitted when the load (gas turbine 1 and combustor 2) is at low speed. However, a torque converter 5 is installed to transmit a lower torque as the load becomes faster.

The gas turbine 1 continues to operate under its own power after startup, so the starter 6 is not required. When the gas turbine 1 reaches a certain rotational speed, the clutch 4 disconnects the starter 6 from the gas turbine 1 side, thereby starting the gas turbine. The load on the gas turbine 1 afterward and during operation can be reduced.

A problem unique to gas turbine power generation equipment is the success or failure of ignition during the startup process.

FIG. 2 is a speed characteristic diagram during the startup process of the gas turbine 1, where the vertical axis R represents the rotational speed and the horizontal axis T represents time.

In the gas turbine power generation equipment shown in FIG. 1 described above, the rotation speed uniformly increases as shown by curve I in FIG. 2.

In this rising process, when the ignition rotation speed A is reached, an operation is performed to ignite a pilot flame in the combustor γ, and after ignition, when the ignition rotation speed B is reached, fuel flows in and the pilot flame ignites the fuel. Perform the operation.

However, if the timing of ignition or ignition is off for some reason, the optimal amount of air may not be obtained, the fire may be blown out, or the mixture ratio of compressed air and fuel may be poor, making it impossible to start.

In this case, the rotational speed increases regardless of the success or failure of ignition or ignition, so if ignition or ignition fails, the gas turbine 1 must be stopped and restarted to try ignition and ignition again. There is.

Also, since the timing of ignition is just a moment when the rotation speed increases uniformly, it is easy to miss the timing.
Problems often occur.

For this reason, there is a demand for a starter device that can reliably ignite the engine during the startup process and provide stable ignition and ignition conditions.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas turbine starting device that can increase the success rate of ignition during startup.

The present invention will be described below with reference to an embodiment shown in FIG.

A gas turbine 1, a compressor 2, and a generator 3 are directly connected on the same axis, and a starter 6 is directly connected to the generator 3 via a clutch 4.

For example, an induction motor is used as the starter 6.

A variable speed control device 8 that controls the primary frequency using an inverter is connected to the starter 6.

This variable speed control device 8 is configured to receive a rotation speed setting signal a from a starting control device 9.

The startup control device 9 receives a rotation speed signal b from a rotation detector 10 that detects the rotation speed of the generator 3, an ignition confirmation signal C from an ignition detector 11 that detects ignition of the combustor 7, and a combustor 7.
The ignition confirmation signal d from the ignition detector 12 detects the ignition of
is now entered.

Further, the startup control device 9 outputs an ignition command signal e and an ignition command signal f to an ignition device 13 and an ignition device 14, respectively, which ignite and ignite the fuel in the combustor 7.

With the starting device configured in this way, the curve ■
The rotation speed is controlled as follows.

In response to the activation command, the activation control device 9 supplies a rotation speed setting signal a to the variable speed control device 8 so that the rotation increases until the ignition rotation speed A is reached.

When the ignition rotation speed A is reached, the increase in the rotation speed is suppressed and the ignition rotation speed A is maintained.

At the same time, an ignition command signal e is given from the activation control device 9 to the ignition device 13.

As a result, the ignition fuel is ignited, and by this ignition, the ignition confirmation signal C from the ignition detector 11 is monitored for a certain period of time, and it is confirmed that a stable ignition state has been obtained. An instruction is issued to the control device 8 to increase the speed to the ignition rotation speed B.

When the ignition rotation speed B is reached, the activation control device 9 stops the rotation increase and maintains the ignition rotation speed B.

At the same time, an ignition command signal f is given from the activation control device 9 to the ignition device 14.

When the fuel is ignited by this, the ignition confirmation signal d from the ignition detector 12 is monitored for a certain period of time, and after confirming that a stable ignition state has been obtained, the startup control device 9 controls the variable speed control device 8. On the other hand, a rotation speed increase command is issued until the gas turbine 1 reaches a rotation speed at which it can start up on its own.

In the above process, if the ignition command signal e is output and the ignition confirmation signal C is not input to the startup control device 9 even after waiting for a certain period of time, the startup control device 9 resets the ignition command signal e once, and then resets the ignition command signal e after a certain period of time. Issue the ignition command signal e again and try the ignition operation.

This is done in the same manner even when the ignition operation, that is, the ignition command signal f is issued from the activation control device 9.

Therefore, even if ignition or ignition is not successful the first time, the ignition or ignition operation is repeated multiple times, and as mentioned above, the speed is increased after the ignition state or ignition state is stabilized, so ignition or ignition is ensured. will be carried out.

Furthermore, since the variable speed control device 8 is of course capable of not only increasing and maintaining the rotation speed, but also decreasing the rotation speed,
If ignition is difficult for some reason at the originally set rotation speed, the rotation speed setting signal a from the starting control device 9
By manually controlling the engine, it is possible to find the optimal rotation speed for ignition or ignition in that state, and it is possible to ensure successful startup.

According to the invention described above, since the rotation speed of the starter can be controlled to be held, increased, and decreased at will without uniformly increasing the rotation speed, ignition can be reliably ignited during the startup process. This makes it possible to provide a gas turbine startup device with a high startup success rate.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional gas turbine power generation equipment, Fig. 2 is a speed characteristic diagram in the starting process of the present invention and a conventional gas turbine, and Fig. 3 is an embodiment of the gas turbine starting device according to the present invention. FIG. 1... Gas turbine, 2... Compressor, 3... Generator, 4... Clutch, 5... Torque converter, 6... ...Starter, 7...Combustor, 8...Variable speed control device, 9...Start control device, 10...
・Rotation detector, 11...Ignition detector, 12...
...Ignition detector, 13...Ignition device, 14
・・・・・・Ignition device.

Claims (1)

[Claims] 1. A combustor that has an ignition and ignition device and that mixes compressed air and fuel to produce combustion gas at a predetermined pressure and temperature, a gas turbine that converts the energy of the combustion gas of this combustor into rotational driving force, and this gas turbine. a generator connected to the turbine;
In the startup process of the gas turbine, a starter for starting the gas turbine, a variable speed control device capable of arbitrarily controlling the rotation speed of the starter, and a rotation speed signal of the generator are inputted, and this is inputted to the ignition rotation speed. then outputs a signal to the variable speed control device to stop increasing the speed of the generator, outputs an ignition command to the ignition device, and when an ignition confirmation signal is input from the ignition device, the variable speed control device outputs a signal to start increasing the speed of the generator to the variable speed control device, and in this state, when the rotation speed signal of the generator reaches the ignition rotation speed, the variable speed control device stops increasing the speed of the generator. an ignition command to the ignition device, and output a signal to the variable speed control device to restart speeding up of the generator when an ignition confirmation signal is input from the ignition device; A gas turbine starting device comprising a control device.