JP3223476B2 - Control method of flow path branch valve, control device, control method of power device, and power device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting a compressor and a high-pressure gas generator, a pipe connecting a high-pressure gas generator and a gas turbine, and a pipe provided between the two pipes. The present invention relates to a control method and a control device for two flow path branch valves, and more particularly to a control method and a control apparatus for a flow path branch valve suitable for safely stopping when a gas turbine and a compressor are stopped.

[0002]

2. Description of the Related Art FIG. 7 is a system diagram of a power unit including a gas turbine, showing the open / closed state of a flow path branch valve during normal operation. FIG. FIG. 9 is a view showing the open / closed state of the flow path branch valve, and FIG. 9 is an explanatory view of the flow path of the gas turbine and the compressor.

[0003] The power unit shown in these figures is a compressor 1
, A gas turbine 2, a generator 3, a high-temperature gas generator 4, a first pipe 5 connecting the compressor 1 and the high-temperature gas generator 4, and connecting the high-temperature gas generator 4 and the gas turbine 2. A second pipe 6, a third pipe 7 connecting the first and second pipes 5 and 6, a first flow path branch valve 8 provided in the first pipe 5, A second flow path branch valve 9 provided in the second pipe 6 and a third flow path branch valve 10 provided in the third pipe 7 are provided.

In a normal operating state, as shown in FIG. 7, the first branch valve 8 and the second branch valve 9 are fully opened, and the third branch valve 10 is fully closed. To And
In this operating state, the compressed air compressed by the compressor 1 is sent to the high temperature gas generator 4 through the first pipe 5 and the first flow path branch valve 8. This high-temperature gas generator 4 includes:
Fuel is supplied from a fuel supply system 11 in addition to the compressed air, and the high-temperature gas generator 4 generates high-temperature gas. The hot gas is supplied to the second pipe 6 and the second flow path branch valve 9.
Through the gas turbine 2. The high-temperature gas drives the gas turbine 2 to rotate, and the compressor 1 and the generator 3
Drive and do the work.

When the gas turbine 2 and the compressor 1 are stopped from a normal operation state or when the gas turbine 2 and the compressor 1 are stopped due to the occurrence of an abnormality, the third turbine is operated as shown in FIG. The flow path branch valve 10 is fully opened, and the first flow path branch valve 8 and the second flow path branch valve 9 are fully closed. In this state, the compressed air flowing out of the compressor 1
Flows from the pipe 5 through the third pipe 7 as a bypass and the third flow path branch valve 10 to the gas turbine 2 via the second pipe 6. Thereby, the supply of the compressed air from the compressor 1 to the high-temperature gas generator 4 is cut off, and the supply of the high-temperature gas from the high-temperature gas generator 4 to the gas turbine 2 is stopped. 1 is stopped.

In this power plant, as shown in an enlarged view in FIG. 9, compressed air discharged from the compressor 1 passes through the outer periphery of the gas turbine inlet gas chamber 12 connected to the second pipe 6, and flows through the compressor. It flows into the first pipe 5. Here, during normal operation, the pressure of the compressed air from the compressor 1 is applied to the outside of the gas turbine inlet gas chamber 12, and the pressure of the hot gas from the high-temperature gas generator 4 is applied to the inside. That is, when the pressure of the compressed air is P1 and the pressure of the high-temperature gas is P2, there is a pressure loss between the first and second pipes 5, 6 and the high-temperature gas generator 4 during normal operation.
P1> P2.

[0007] In this power plant, when the energy balance between the respective devices is lost or when a trouble occurs in any device, the following control is performed. That is, for example, when the supply of energy from the high-temperature gas generator 4 to the gas turbine 2 abnormally increases,
Since there is a risk that a sudden change in speed or load may occur in the gas turbine 2, the second flow path branch valve 9 provided in the second pipe 6 connecting the high-temperature gas generator 4 and the gas turbine 2 may Control alone to reduce energy entering the gas turbine 2. Further, for example, when an abnormality occurs in the high-temperature gas generator 4, the third flow path branch valve 10 is fully closed so that the supply of energy from the high-temperature gas generator 4 to the gas turbine 2 is shut off. ing. Further, when an abnormality occurs in the high-temperature gas generator 4 itself, the first flow path branch valve 8 provided in the first pipe 5 connecting the compressor 1 and the high-temperature gas generator 4 is fully closed. Then, the supply of the compressed air to the high-temperature gas generator 4 is shut off.

[0008]

The following problems have conventionally been encountered in controlling the flow path branch valve in the power unit.

(1) For example, when an abnormality occurs in the high-temperature gas generator 4, a first connection between the compressor 1 and the high-temperature gas generator 4 is made.
When only the first flow path branch valve 8 provided in the pipe 5 is closed suddenly, the compressor 1 cannot be stopped suddenly due to inertia, and there is no place for compressed air to go.

(2) When only the second flow path branch valve 9 provided in the second pipe 6 connecting the high-temperature gas generator 4 and the gas turbine 2 is first closed, as shown in FIG. , The pressure P1 of the compressed air and the pressure P2 of the hot gas are P1
>> P2, which may be crushed by the pressure P1 of the compressed air.

(3) First, second, and third flow path branch valves 8,
For example, when fluid pressure or electricity is used as the drive source for the components 9 and 10, when the drive source is lost, the gas turbine 2 must be stopped until the hot gas discharged from the hot gas generator 4 is exhausted. Can not be done.

An object of the present invention is to provide a power plant with
Clarifying the sequential operation of the second and third flow-path branch valves and controlling the flow-path branch valve and the control of the power unit that can safely stop the gas turbine and the compressor even when an abnormality occurs in the power unit.
It is to provide a control method .

It is another object of the present invention to provide a control device and a power unit for a flow-path branch valve which can accurately carry out the method of the present invention.

[0014]

[0015]

Means for Solving the Problems] The object is achieved when stopping the compressor and the gas turbine, after first opened the third flow path branching valve, first, close the second flow path branching valve This is achieved by doing so.

[0016]

[0017]

[0018] The object is the first, second, and third.
Is connected to the control unit, and when the control unit stops the gas turbine and the compressor, first, the third flow passage branch valve is opened, and then the first and second flow branch valves are opened. by the flow path branching valve and capable of controlling the order operation for closing kinematic <br/> operation is achieved.

Further, the above object is achieved by connecting the first, second and third flow path branch valves to a control section, and the control section first controls the third flow path when the gas turbine and the compressor are stopped. Opening the first branch valve and then simultaneously closing the first and second branch valves, and closing the second branch valve with respect to the closing speed of the first branch valve. Is gradually controlled so as to be controllable.

Further, the object is the first, second, third
Is connected to the control unit, and when the control unit stops the gas turbine and the compressor, the third flow passage branch valve is opened first, and then the first flow passage branch valve is opened. Is closed,
This is also achieved by a configuration in which control can be performed in the order of closing the second flow path branch valve.

[0021]

[0022]

[0023]

[0024]

In the power unit to which the present invention is applied, during normal operation, the first flow path branch valve provided in the first pipe connecting the compressor and the high-temperature gas generator is fully opened, and the high-temperature gas generation is performed. A second pipe provided in a second pipe connecting the apparatus and the gas turbine
Is also fully opened, and the third flow path branch valve provided in the third pipe connecting the first and second pipes is fully closed.

When the gas turbine and the compressor are stopped when an abnormality occurs in the power unit or for some reason, the control method of the present invention first opens the third flow-path branch valve. Next, the first flow path branch valve and the second flow path branch valve
The closed Jill.

As a result, the compressed air discharged from the compressor is
First pipe → third pipe and third flow path branch valve → second
And enters the gas turbine inlet gas chamber through the pipe. As described above, by clarifying the sequential operation of the first, second, and third flow path branch valves, there is no place for compressed air compressed due to inertia when the compressor is stopped. The problem can be solved, and the problem that the gas turbine inlet gas chamber is crushed due to the abnormal decrease in the pressure inside the gas turbine inlet gas relative to the pressure outside the gas turbine inlet gas chamber can also be solved. Therefore, when an abnormality occurs in the power unit or when the gas turbine and the compressor are stopped for some reason, the gas turbine and the compressor can be safely stopped.

[0027]

[0028]

[0029]

[0030]

[0031] Then, the first in this onset AkiraSo location, the second, third
Are connected to the control unit. Thus, when stopping the compressor and the gas turbine, to open the first of the third flow path branching valve by the control unit, Ji then closed and the first flow path branch valve and the second flow path branch valve Control so that

Thus, when the gas turbine and the compressor are stopped, the compressed air compressed by the inertia of the compressor is supplied to the first pipe → the third pipe and the third branch valve → the second pipe. The gas can be reliably guided through the pipe into the gas turbine inlet gas chamber. Therefore, according to the onset AkiraSo location can be accurately carried out the present onset bright Way Method.

Further, in this onset AkiraSo location when stopping the compressor and the gas turbine, first opening the third flow path branching valve by the control unit. Next, the first flow path branch valve and the second flow path branch valve are simultaneously closed by the control unit, but the closing speed of the second flow path branch valve is smaller than the closing speed of the first flow path branch valve. Delay. As a result, the fully closed time of the second flow path branch valve is delayed with respect to the fully closed time of the first flow path branch valve.

[0034] Thus, also in this onset AkiraSo location, first by the control unit, the second, it is possible to clarify the sequence operation of the third flow path branching valve, precisely the present onset bright Way Method Can be implemented.

Furthermore, when in this onset AkiraSo location for stopping the compressor and the gas turbine, first open the third flow path branching valve by the control unit. Next, the control section closes the first flow path branch valve, and then closes the second flow path branch valve.

[0036] Thus, also in this onset AkiraSo location, first by the control unit, the second, it is possible to clarify the sequence operation of the third flow path branching valve, accurately carrying out the present onset bright Way Method Can be

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an explanatory view of Embodiment 1 of the present invention, and is a diagram showing the sequential operation of first, second and third flow path branch valves.

The power unit is, as shown in FIG.
, Gas turbine 2, generator 3 and high-temperature gas generator
4 and a first connection between the compressor 1 and the hot gas generator 4.
Connecting the pipe 5, the high-temperature gas generator 4 and the gas turbine 2
The second pipe 6 is connected to the first and second pipes 5 and 6.
Provided in the third pipe 7 and the first pipe 5.
A first flow path branch valve 8 and a second pipe 6
The second flow path branch valve 9 and the third pipe 7 are provided.
The third flow path branch valve 10 is provided. Soshi
During normal operation of the power unit, as shown in FIG. 7, the first flow path branch valve 8 provided in the first pipe 5 connecting the compressor 1 and the high-temperature gas generator 4 is fully opened and has a high temperature. The second flow path branch valve 9 provided in the second pipe 6 connecting the gas generator 4 and the gas turbine 2 is also fully opened, and the third pipe connecting the first pipe 5 and the second pipe 6 is provided. The third flow path branch valve 10 provided in the pipe 7 is fully closed.

In this state, when a trip signal is generated as shown in FIG. 1 when an abnormality occurs in the power unit or for other reasons, a control unit (not shown) is provided with a predetermined time delay DT from that point. ), The third flow path branch valve 1
Open 0. Next, after a predetermined time delay DT 'from the opening operation of the third flow passage branch valve 10, the first flow passage branch valve 8 and the second flow passage branch valve 9 are simultaneously closed by the control unit. Then, the closing speed of the second flow-path branch valve 9 is gradually delayed by the control unit with respect to the closing speed of the first flow-path branch valve 8.

Therefore, the fully closed time of the second branch valve 9 is delayed with respect to the fully closed time of the first branch valve 8.

Adjustment of the closing speed of the first flow path branch valve 8 and the second flow path branch valve 9 is performed by controlling the constituent members of the control unit, for example, the first and second flow path branch valves 8 and 9. When a fluid pressure is used as the driving source for the circulating fluid, a flow control valve for controlling the fluid flow rate may be provided, or a variable orifice may be inserted.

As described above, in the first embodiment, when the gas turbine 2 and the compressor 1 are stopped, the third flow path branch valve 10 is first opened, and then the first and second flow path branch valves 8, 9 are simultaneously closed, and the closing speed of the second flow passage branch valve 9 is gradually reduced with respect to the closing speed of the first flow passage branch valve 8, so that the compression output from the compressor 1 is reduced. The air passes through the first pipe 5 → the third pipe 7 and the third flow path branch valve 10 → the second pipe 6 shown in FIGS. 7 and 8 and passes through the gas turbine inlet gas chamber 12 shown in FIG. Can be put inside.

As described above, by clarifying the sequential operation of the first, second, and third flow path branch valves 8, 9, and 10, the inertia of the compressor 1 when the compressor 1 is stopped. Thus, it is possible to solve the problem caused by the lack of the destination of the compressed air. Further, the problem that the gas turbine inlet gas chamber 12 is crushed due to the pressure difference between the outside and the inside of the gas turbine inlet gas chamber 12 can be solved.
Therefore, when the gas turbine 2 and the compressor 1 are stopped in the first embodiment, it is possible to safely stop the gas turbine 2 and the compressor 1.

In the first embodiment, the first and second
It is also possible to make the closing speeds of the flow path branch valves 8 and 9 equal to each other and at the same time to bring them into the fully closed state.

(Embodiment 2) Next, FIG. 2 is an explanatory view of Embodiment 2 of the present invention, and is a diagram showing the sequential operation of the first, second and third flow path branch valves.

In the second embodiment shown in FIG. 2, when the gas turbine 2 and the compressor 1 are stopped, the control unit (not shown) delays a predetermined time DT from the time when the trip signal is issued. First, the third flow path branch valve 10 is opened. Then, after detecting the opening operation of the third flow path branching valve 10, a time delay DT is provided and the first control is performed by the control unit.
Is closed. Subsequently, after detecting the opening operation of the third flow path branch valve 10, the control section closes the second flow path branch valve 9 after a time delay DT. In the second embodiment, the closing speeds of the first and second flow path branch valves 8 and 9 are set to be substantially the same.

The opening operation of the third branch valve 10 can be detected by, for example, a detecting means provided with a contact on the valve element side which opens and closes and a limit switch on the fixed member side.

As described above, in the second embodiment, when the gas turbine 2 and the compressor 1 are stopped, first, the third flow path branch valve 10 is opened, and then the first flow path branch valve 8 is closed. Next, the second flow path branch valve 9 is closed.

As a result, in the second embodiment, until the second flow passage branch valve 9 is fully closed in the gas turbine inlet gas chamber 12 through the second pipe 6 shown in FIGS. Since the high-temperature gas discharged from the high-temperature gas generator 4 can be introduced, the pressure difference between the outside and the inside of the gas turbine inlet gas chamber 12 can be further reduced, and the gas turbine inlet gas chamber can be reduced by the inside and outside pressure differences. It is possible to more reliably solve the problem that the 12 is crushed.

Other structures and operations of the second embodiment are the same as those of the first embodiment.

(Embodiment 3) FIGS. 3 to 5 show a third embodiment of the present invention, which shows a butterfly valve used for first, second and third flow path branch valves. 3 is a partial cross-sectional plan view, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 5 is a view taken in the direction of arrow B in FIG.

The first, second, and third flow path branch valves 8,
A butterfly valve according to the third embodiment used as the components 9 and 10 includes a butterfly valve element 17 integrally attached to a casing 15, a valve stem 16, and a valve stem 16 in the casing 15.
, A crank 19 having two crank arms 19a and 19b and attached to one end of the valve stem 16, and an end of one crank arm 19a. Hydraulic cylinder 20 arranged on the side
And a piston rod 21 fitted into and connected to the one crank arm 19a, and the other crank arm 1
9b, a control unit 23 including a controller 24 and a directional control valve 25, a limit switch 26 for detecting the opening operation of the valve body 17, and one end of the valve stem 16 in a circumferential direction. And a plurality of contacts 27 that are provided at an interval and that can contact the limit switch 26. The direction switching valve 25 is connected to a fluid pressure supply device (not shown).

By the way, when this butterfly valve is used as the third flow passage branching valve 10 shown in FIGS. 7 and 8, for example,
During normal operation of the power unit, it is fully closed.

When the gas turbine 2 and the compressor 1 are stopped, for example, when a trip signal shown in FIG. 2 is issued, the trip signal is sent to the controller 24. Therefore, after a predetermined time delay DT, the controller 24 switches the direction switching valve 25 to supply the fluid pressure to the fluid pressure cylinder 20 in a direction to open the valve body 17. As a result, the hydraulic cylinder 20 controls the piston rod 21, and this piston rod 21 and one of the crank arms 19
a, The valve element 17 is rotated through the valve rod 16, and the butterfly valve as the third flow path branch valve 10 is fully opened as shown in FIG. 2, for example. At the time of the opening operation of the butterfly valve as the third flow path branch valve 10, the opening operation is detected by the contact 27 and the limit switch 26 that come into contact first, and the detection signal is sent to the controller 24. When the controller 24 first receives the detection signal of the opening operation of the third flow-path branch valve 10, for example, in the second embodiment shown in FIG. The control signal is sent to the directional control valve 8 and the first
Is closed. Next, when the contact 27 that contacts the second time contacts the limit switch 26 and the controller 24 receives a detection signal of the second opening operation of the third flow path branch valve 10 from the limit switch 26, for example, FIG. In the second embodiment shown in FIG. 7, after a predetermined time delay DT, a control signal is sent to the direction switching valve of the second flow path branch valve 9, and the second
Is closed.

In the third embodiment, when the fluid pressure is lost due to a failure of the fluid pressure supply device or the like, the rotation of the other crank arm 19 b is controlled by the action of the compression spring 22, and the control by the fluid pressure cylinder 20 is performed. Similarly, the valve element 17 is controlled through the valve rod 16.

The butterfly valve is connected to first and second flow path branch valves 8,
When used as 9, the power unit is set to fully open during normal operation, and when the gas turbine 2 and the compressor 1 are stopped, the power is controlled from the fully open state to the fully closed state. Incorporate to act in the closing direction.

The butterfly valve can be used for the first, second, and third flow path branching valves 8, 9, and 10, and can be controlled as in the first embodiment shown in FIG.

In the third embodiment, the rotation of the valve rod 16 may be controlled by a reversible electric motor instead of the fluid pressure cylinder 20.

Further, this butterfly type valve is used as the first and second flow passage branching valves 8 and 9, and as in the second embodiment, the closing speed of the first flow passage branching valve 8 is reduced by the first speed. 2 channel branch valve 9
If the closing speed of the cylinder is to be delayed,
A flow control valve, a variable orifice, and the like are provided between 0 and the direction switching valve 25, and the flow rate can be adjusted.

(Embodiment 4) FIG. 6 shows Embodiment 4 of the present invention and is a longitudinal sectional view of an angle valve used for first, second and third flow path branch valves.

The angle valve according to the fourth embodiment shown in FIG.
A casing 30, an angle type pipe line 31 assembled to the casing 30, a valve seat 32, a valve body 33,
A valve rod 34, a detector mounting sleeve 35 connected in the axial direction of the casing 30, and a plurality (two) of which are arranged at intervals in the moving direction of the valve rod 34 and are mounted on the sleeve 35. A limit switch 36, a contact 37 provided on the valve stem 34 and in contact with the limit switch 36, a hydraulic cylinder 38 connected to the sleeve 35, and a hydraulic cylinder 38 attached to the valve stem 34 and , A compression spring 40 provided between the spring receiving portion of the fluid pressure cylinder 38 and the piston 39, and a control portion 41 having a controller 42 and a direction switching valve 43. I have. The direction switching valve 43 is connected to a fluid pressure supply device (not shown).

When the angle valve of the fourth embodiment is used, for example, as the third branch valve 10 shown in FIGS. 7 and 8, it is fully closed during normal operation of the power unit.

Next, when the gas turbine 2 and the compressor 1 are stopped, for example, when a trip signal shown in FIG. 2 is issued, the trip signal is sent to the controller 42.
After a predetermined time delay DT, the controller 42 switches the direction switching valve 43 to supply the fluid pressure to the fluid pressure cylinder 38 in the direction to open the valve body 33. As described above, when the direction switching valve 43 is switched, the valve element 33 is opened to the fully opened state via the piston 39 and the valve rod 34. During the opening operation of the angle valve serving as the third flow path branch valve 10, when the contact 37 is separated from the first limit switch 36, the opening operation of the third flow path branch valve 10 is detected, and the detection signal is output. Is sent to the controller 42. When the controller 42 first receives a detection signal of the opening operation of the third flow path branch valve 10,
For example, in the second embodiment shown in FIG. 2, after a predetermined time delay DT, a control signal is sent to the direction switching valve of the first flow path branch valve 8, and the first flow path branch valve 8 is closed. Next, when the contact 37 comes into contact with the next limit switch 36, a detection signal of the second opening operation of the third branch valve 10 is sent from the limit switch 36 to the controller 42. Here, when the controller 42 receives the detection signal of the second opening operation of the third flow path branch valve 10, the second embodiment shown in FIG.
Then, after a predetermined time delay DT, the second flow path branch valve 9
A control signal is sent to the directional control valve to close the second flow path branch valve 9.

In the fourth embodiment, when the fluid pressure is lost due to a failure of the fluid pressure supply device or the like, the piston 39 is controlled by the action of the compression spring 40, and the control is performed in the same manner as the control by the fluid pressure cylinder 38. The valve element 33 is controlled through the valve rod 34.

When the above-described angle valve is used as the first and second flow path branch valves 8 and 9, the power unit is set to be fully opened during the normal operation of the power unit, and when the gas turbine 2 and the compressor 1 are stopped. Is controlled from a fully open state to a fully closed state, and the compression spring 40 is incorporated in a direction in which the valve body 33 is closed.

Further, the angle valve according to the fourth embodiment is the first
It can be used as the second and third flow path branch valves 8, 9, and 10, and can be controlled as in the first embodiment shown in FIG.

[0074]

According to the present invention described above, the following effects can be obtained.

[0075] When stopping the (claim 1) compressor and a gas turbine power plant, after first opened the third flow path branching valve, first, the second flow path branch valve closed Yo Jiru Since the sequential operation of the first, second, and third flow path branch valves is clearly defined, there is no place for compressed air compressed by inertia when the compressor is stopped. Can be solved, and the problem that the gas turbine inlet gas chamber is crushed due to the abnormal decrease in the inner pressure with respect to the outer pressure of the gas turbine inlet gas chamber can also be solved. In addition, when an abnormality occurs in the power unit or when the gas turbine and the compressor are stopped for some reason, the gas turbine and the compressor can be stopped safely.

[0076]

[0077]

(Claim 2) The first, second and third flow path branch valves are connected to a control unit,
When the control unit stops the gas turbine and the compressor, first, the third flow path branch valve is opened, and
Since the control is performed by the sequential operation of closing the second flow path branch valve , there is an effect that the control method according to claim 1 can be accurately executed.

(Claim 3 ) The first, second, and third flow path branch valves are connected to a control unit,
When the control unit stops the gas turbine and the compressor, first, the third flow path branch valve is opened, and
Since the second passage branch valve is simultaneously closed and the closing speed of the second passage branch valve is controlled to be gradually delayed with respect to the closing speed of the first passage branch valve. The first
When the second branch valve is fully closed compared to the fully closed time of the branch valve
Delay between the outside and inside pressure of the gas turbine inlet gas chamber
As a result, the difference
When shutting down the compressor and compressor,
The effect is that the machine can be stopped more safely.
You.

(Claim 4) The first, second, and third flow path branch valves are connected to a control unit,
When the control unit stops the gas turbine and the compressor, first, the third passage branch valve is opened, then the first passage branch valve is closed, and then the second passage branch valve is closed. Since the control is performed by the sequential operation of closing the branch valve, the pressure difference between the outside and the inside of the gas turbine inlet gas chamber can be further reduced similarly to the third embodiment.
The pressure difference between the inside and outside of the gas turbine inlet gas chamber can more reliably eliminate the problem that the gas turbine inlet gas chamber is crushed, and the gas turbine and the compressor can be safely stopped. (Claim 5) When the turbine is instructed to stop, it is supplied from the compressor.
Compressed air is bypassed to the hot gas generator and
Compressed air supplied to the hot gas generator after
And shut off the hot gas supplied to the turbine.
Since it is configured to cut off, the same as claim 1 above
The effect of can be obtained. (Claim 6) When a turbine stop command is received, the third valve is turned off.
Open operation and then close the first and second valves respectively.
Since the control device is provided with a control device,
The same effect as described above can be obtained.

[0081]

[0082]

[0083]

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and includes first, second, and third embodiments.
It is a diagram showing the sequential operation of the third flow path branch valve.

FIG. 2 shows a second embodiment of the present invention, in which first, second,
It is a diagram showing the sequential operation of the third flow path branch valve.

FIG. 3 shows a third embodiment of the present invention, in which first, second, and third embodiments are used.
It is a cross-sectional plan view of the butterfly valve used for the 3rd flow-path branch valve.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view taken in the direction of the arrow B in FIG. 3;

FIG. 6 shows a fourth embodiment of the present invention, in which first, second, and
It is a longitudinal section of an angle valve used for the 3rd channel branch valve.

FIG. 7 is a system diagram of a power plant to which the present invention is applied, and is a diagram showing a state during normal operation.

8 is a diagram showing a state in which a gas turbine and a compressor of the power plant shown in FIG. 7 are stopped.

9 is an explanatory diagram of a flow path of a gas turbine and a compressor in the power plant shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Gas turbine, 3 ... Generator, 4 ... High-temperature gas generator, 5,6,7 ... First, second, third piping,
8, 9, 10 ... first, second, third flow path branch valves, 12 ...
Gas turbine inlet gas chamber, 15... Butterfly-shaped valve casing used as first, second, and third flow path branch valves, 16.
The same valve rod, 17: the same valve element, 19: the same crank, 20: a fluid pressure cylinder which is a drive unit in a normal state, 21: the same piston rod, 22: a compression spring which is a drive unit in an emergency, 23: a valve Control unit, 24: controller in the control unit, 25: same-direction switching valve, 26: limit switch, which is a means for detecting the opening operation of the valve, 27: same contactor, 30: first, second, and third flows Angle valve casing used as a path branch valve, 3
DESCRIPTION OF SYMBOLS 1 ... The same angle type pipe line, 32 ... The same valve seat, 33 ... The same valve body, 34 ... The same valve rod, 36 ... The limit switch which is the detection means of valve opening operation, 37 ... The same contactor, 38 ... Normally The hydraulic cylinder as a driving source at the time, 39 ... the same piston, 40 ...
Compression spring, which is a drive unit in case of emergency, 41 ... Control unit of valve, 4
2 ... Controller in the control unit, 43 ... Same direction switching valve.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junji Shimomura 3-1-1 Sachimachi, Hitachi-City, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Satoshi Sato 3-Chome, Sachimachi, Hitachi-City, Ibaraki No. 1 Hitachi, Ltd., Hitachi Plant (72) Inventor Masato Machida 3-1-1, Sakaimachi, Hitachi, Ibaraki Prefecture Hitachi, Ltd., Hitachi Plant (56) References JP-A-63-230927 (JP, A) JP-A-4-252825 (JP, A) JP-A-1-217107 (JP, A) JP-A-62-178731 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) F02C 3/28 F02C 9/00 F02C 9/18 F23C 10/16

Claims (6)

(57) [Claims] 1. A first connection between a compressor and a high-temperature gas generator.
The first pipe is provided with a normally open first flow path branch valve, and the second pipe connecting the high-temperature gas generator and the gas turbine is provided with a normally open second flow path branch valve. Piping compressor and gas
In a method of controlling a flow path branch valve in a power plant in which a third pipe is connected between pipes on the turbine side and a third flow path branch valve that is normally closed is provided in the third pipe, the gas turbine and the compression pipe are connected to each other. A method for controlling a flow-path branch valve, comprising: first opening a third flow-path branch valve and then closing the first and second flow-path branch valves when the machine is stopped. 2. A first connection between a compressor and a high-temperature gas generator.
The first pipe is provided with a normally open first flow path branch valve, and the second pipe connecting the high-temperature gas generator and the gas turbine is provided with a normally open second flow path branch valve. Piping compressor and gas
In a control device for a flow path branch valve in a power plant in which a pipe on the turbine side is connected with a third pipe and a third flow path branch valve that is normally closed is provided in the third pipe, 2. Connect the third flow path branch valve to the control unit, and when the control unit stops the gas turbine and the compressor, first open the third flow path branch valve, And a control device for controlling the flow passage branch valve, the control device being configured to be controllable in an order operation of closing the second flow passage branch valve. 3. A first system for connecting a compressor and a high-temperature gas generator.
The first pipe is provided with a normally open first flow path branch valve, and the second pipe connecting the high-temperature gas generator and the gas turbine is provided with a normally open second flow path branch valve. Piping compressor and gas
In a control device for a flow path branch valve in a power plant in which a pipe on the turbine side is connected with a third pipe and a third flow path branch valve that is normally closed is provided in the third pipe, 2. Connect the third flow path branch valve to the control unit, and when the control unit stops the gas turbine and the compressor, first open the third flow path branch valve, , The second passage branch valve is simultaneously closed, and the closing operation of the second passage branch valve is controlled by gradually delaying the closing speed of the first passage branch valve. Control device for the flow path branch valve. 4. A first system for connecting a compressor and a high-temperature gas generator.
The first pipe is provided with a normally open first flow path branch valve, and the second pipe connecting the high-temperature gas generator and the gas turbine is provided with a normally open second flow path branch valve. Piping compressor and gas
In a control device for a flow path branch valve in a power plant in which a pipe on the turbine side is connected with a third pipe and a third flow path branch valve that is normally closed is provided in the third pipe, 2. Connect the third flow path branch valve to the control unit, and when the control unit stops the gas turbine and the compressor, first open the third flow path branch valve, A control device for a flow path branch valve, characterized in that the flow path branch valve can be controlled to perform a closing operation, and then a second flow path branch valve is closed. 5. A compressor for compressing air, a high-temperature gas generator for generating a high-temperature gas by compressed air supplied from the compressor, and a turbine driven by the high-temperature gas supplied from the high-temperature gas generator. In the power plant control method for controlling a power plant comprising: at the time of the turbine stop command, compressed air supplied from the compressor, after supplying to the turbine by bypassing the high-temperature gas generator, the A method of controlling a power plant, comprising shutting off high-temperature gas supplied to a turbine while shutting off compressed air supplied to a high-temperature gas generator. 6. A compressor for compressing air, a hot gas generator for generating a hot gas by compressed air supplied from the compressor, and a turbine driven by the hot gas supplied from the hot gas generator. A first valve disposed on a flow path of compressed air connecting the compressor and the high-temperature gas generator, and a first valve disposed on a flow path of high-temperature gas connecting the high-temperature gas generator and the turbine. A power plant comprising: a second valve, and a third valve that bypasses the high-temperature gas generator and is disposed on a flow path of compressed air that connects the compressor and the turbine. A power plant, comprising: a control device that, when receiving a stop command, opens the third valve and thereafter closes the first and second valves.