JPS61129408A - Safety device of turbine - Google Patents

Abstract

PURPOSE:To enable a trip valve to be repaired and replaced while a turbine is in operation, by providing a valve, which can isolate the trip valve from a fluid pressure source, in an inlet side of the trip valve switched by operation of an emergency trip device. CONSTITUTION:When a turbine is in normal operation, controlled pressure oil CO, being supplied via a feed oil pipe 25, mechanical trip valve 1, outlet side pipe 26, lock out valve 21, outlet side pipe 27 and an electrical trip valve 22, acts as the emergency pressure 2 of oil on a valve (not shown in the drawing) provided in an inlet or the like of the turbine. While the controlled pressure oil CO, if either one of the trip valve 1 or 22 is switched to a trip side, is collected to an oil tank 3 or 28, performing a turbine trip by rapidly closing the valve. In the above, when the trip valve 1 is repaired and/or replaced, a pressure oil main valve 24 is closed with the lock out valve 21 being left as locked out, and under this condition the valve 1 is repaired and replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a turbine safety device for driving a generator, for example, and more particularly to a turbine safety device that enables maintenance of a trip valve during operation of a turbine.

[Technical background of the invention and its problems]

Generally, a generator-driving turbine is usually provided with an emergency trip device that automatically shuts off the inflow of energy in case of an abnormal situation in the turbine generator.

Incidentally, emergency trip devices that automatically cut off the flow of energy into a turbine have been proposed in various forms depending on the type and output of the turbine, but generally have the configuration shown in Figure 3. are doing.

In this emergency trip device, during normal operation, control oil Go acts on a valve (not shown) as an emergency hydraulic pressure or safety hydraulic pressure (hereinafter referred to as emergency hydraulic pressure) 2 via a mechanical trip valve 1 to open the valve. This valve is provided at the inlet of the turbine to cut off energy flowing into the turbine, and is normally kept open by the action of the emergency oil pressure 2.

On the other hand, when the emergency trip device is activated, the mechanical trip valve 1 is switched, the emergency oil pressure 2 is recovered into the oil tank 3 via the mechanical trip valve 1, and the pressure of the emergency oil pressure 2 is reduced. This causes the valve to close suddenly, cutting off the flow of energy into the turbine and creating a trip state.

That is, in this emergency trip device, when the emergency governor 114 operates, for example, the trip finger 5 rotates in the direction of the arrow from the solid line position to the chain line position in the figure against the biasing force of the spring 6. Due to this rotation of the trip finger 5, the claw 7a of the latch mechanism 7 disengages from the tip of the trip rod 8, and the trip rod 8 is moved by the biasing force of the spring 9 at the arrow mark in the figure.
The mechanical trip valve 1 is switched to the trip side.

Even if the manual trip handle 10 is pulled in the direction of arrow C or the Orad 12 is activated by starting the mechanical trip solenoid 11, the latch mechanism 7 is disengaged and the mechanical Trip valve 1 is switched to the trip side.

In FIG. 3, reference numeral 13 swings around the lower end bin 14 position as a fulcrum, and the vertically intermediate portion abuts against the flange 8a of the trip rod 8 and moves the trip rod 8 in the direction opposite to the arrow B 4j. This reset lever 13 includes a reset cylinder 15 that operates the reset lever 13 in the direction of the arrow in the figure by moving the piston 16 and the rod 17 against the biasing force of the spring 18, and this reset lever 13. Bearing oil D in reset cylinder 15
Together with the oil reset solenoid valve 19 that supplies O, it constitutes a return mechanism for returning the turbine from the trip state to the reset state.

Further, in FIG. 3, reference numeral 20 is a solenoid valve for oil trip, and the operation of this solenoid valve 20 supplies bearing oil DO to the emergency governor 4, which increases the amount of eccentricity of the emergency governor 4 and causes an emergency. The speed governor 4 and mechanical trip valve 1 can be tested.

By the way, this emergency trip device is a turbine protection device and requires high reliability, so it is necessary to periodically (usually about once a week) perform an operation test using the oil trip solenoid valve 20. Moreover, it is necessary to be able to perform this operation test even while the turbine is operating at its rated speed.

Conventionally, a security device shown in FIG. 4 has been provided to make this possible.

This safety device includes a lockout valve 21 provided on the outlet side of the mechanical trip valve 1 and an electrical trip valve 22 provided on the outlet side of the lockout valve 21, as shown in FIG. By switching the lockout valve 21, control oil CO is supplied to a valve (not shown) provided at the inlet of the turbine, bypassing the mechanical trip valve 1 via the bypass line 23, and turning on the turbine. The mechanical trip valve 1 can be tripped even during rated speed operation. Further, the electric trip valve 22 is actuated by an electric signal to trip the turbine when an abnormal situation occurs in the turbine generator, so that the turbine can be tripped even when the lockout valve 21 is in the lockout state. It has become.

In this safety system, when testing the emergency trip device, the lockout valve 21 is first locked out, and the control oil CO is passed through the bypass line 23 to bypass the mechanical trip valve 1 to become the emergency oil pressure 2.

Next, the emergency trip device is tripped by directly operating the oil trip electromagnetic valve 20, the mechanical trip solenoid 11, or the emergency governor 4, and the mechanical trip valve 1 is switched to the trip side.

Check whether each part operates normally by performing the abnormal operation. After confirmation, the oil reset solenoid valve 19 is switched to the reset side to reset the emergency trip device, and the lockout valve 21 is switched to release the lockout.

In order to improve its reliability, the electric trip valve 22 may be configured using two electromagnetic valves, and the turbine may be tripped only when both electromagnetic valves are activated.

Therefore, in the conventional turbine safety system, it is possible to test the emergency trip device even while the turbine is operating at the rated speed.

By the way, in recent years, improvements in the reliability of power generation plants have been attracting much attention, and in nuclear power plants in particular, the aim is not only to improve reliability but also to improve the operating S rate, and problems can be detected even while the turbine is in operation. There is an increasing demand to be able to perform maintenance without stopping the turbine.

However, in the conventional safety device, the control oil CO is always acting on the mechanical trip valve 1, so even if an abnormality occurs in the mechanical trip valve 1, there is a problem that it cannot be repaired while the turbine is operating. There is.

[Purpose of the invention]

The present invention eliminates the drawbacks of the conventional ones mentioned above,
It is an object of the present invention to provide a turbine safety device that can be repaired or replaced during turbine operation even when an abnormality occurs in a trip valve switched and driven by an emergency trip device.

[Summary of the invention]

The present invention provides a valve that can disconnect the first trip valve from the fluid pressure source on the inlet side of the first trip valve that is switched by the operation of the emergency trip device, and operates the valve to switch the first trip valve to the fluid pressure source. By disconnecting the first trip valve from the power source, the first trip valve can be repaired or replaced during turbine operation.

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the present invention, and in FIG. 1, reference numeral 1 designates a mechanical trip valve that is switched via a trip rod 8 by an emergency trip device configured as shown in FIG. 3, for example. This mechanical trip valve 1
Control oil CO is supplied from a hydraulic source (not shown) via an oil feed pipe 25 having a hydraulic main valve 24.

The control oil CO sent to the mechanical trip valve 1 via the oil pipe 25 is normally supplied to the mechanical trip valve 1.
The electric trip valve 2 is supplied to the lockout valve 21 via the outlet pipe 26, and is further connected to the outlet side of the lockout valve 21 via the outlet pipe 27.
2, the emergency oil pressure 2 is supplied to a valve (not shown) provided in the inlet pipe of the turbine.

Further, in both the trip valves 1 and 22, an oil tank 3.28 is provided which recovers the control oil co supplied to the valve (not shown) when the trip is activated and reduces the pressure of the emergency oil pressure 2.
are connected to each other.

Further, one end of a bypass line 23 is connected to the inlet side position of the oil pressure source valve 24 of the oil pipe 25.
The other end of 3 is connected to a lockout valve 21, bypassing the mechanical trip valve 1.

Next, the operation of the first embodiment described above will be explained.

During normal operation, control oil CO is supplied to the oil supply pipe 25, mechanical trip valve 1, outlet pipe 26, and lockout valve 2.
1, outlet pipe 27, and electrical trip valve 2
2, and acts as an emergency hydraulic pressure 2 on a valve (not shown) provided at the inlet of the turbine, etc. This keeps the valve open.

Either the mechanical trip valve 1 or the electrical trip valve 22 is switched to the trip side and the first
When the situation shown in the figure occurs, the control oil CO supplied to the valve is collected into the oil tank 3 or 28, and the emergency oil pressure 2 is reduced in pressure, causing the valve to open suddenly and causing a turbine trip. Ru.

On the other hand, when testing the mechanical trip valve 1 during turbine operation, first the lockout valve 21 is switched to the lockout side and ii111Ml oil co is sent to the turbine side via the bypass line 23.

In this state, the mechanical trip valve 1 is tested.

If there is no abnormality as a result of the test, mechanical trip valve 1
at the same time as switching the lockout valve 21 to the reset side.
Switch to release the lockout.

If there is any abnormality in the mechanical trip valve 1 as a result of the test, the hydraulic main valve 24 is closed with the lockout valve 21 locked out to prevent control oil CO from being supplied to the mechanical trip valve 1 via the oil pipe 25. Make it. Then, in this state, the mechanical trip valve 1 is repaired or replaced, and then the mechanical trip valve 1 is switched to the reset side, the oil pressure source valve 24 is opened, and the lockout valve 21 is switched to release the lock alignment I~.

Note that if it is necessary to trip the turbine during the test of the mechanical trip valve 1, the electric trip valve 22 is switched to the trip side by the turbine trip electric signal, and the turbine is tripped.

In this way, by providing the hydraulic source valve 24 on the inlet side of the mechanical trip valve 1, it is not only possible to test the mechanical trip valve 1 during turbine operation, but also to repair or replace it if there is an abnormality. can be done.

In the first embodiment, the mechanical trip valve 1 can be tested, repaired, and replaced without tripping the turbine, but the electrical trip valve 22 cannot be tested, repaired, or replaced.

In addition, in the first embodiment, since the oil feed pipe 25, which serves as the supply path for the control oil CO, and the bypass line 23 are partially shared, slight oil pressure fluctuations may occur during test operation of the mechanical trip valve 1. If the timing is bad or there is an abnormality in the emergency trip device,
The synergistic effect may cause the turbine to trip incorrectly.

FIG. 2 allows testing, repair, and replacement of the mechanical trip valve 1 during turbine operation, and
This embodiment shows a second embodiment of the present invention that can also solve the problems in the first embodiment, and will be described below.

In FIG. 2, reference numeral 1 denotes a mechanical trip valve 1 which is switched via a trip rod 8 by an emergency trip device having the configuration shown in FIG. 3, for example. Control oil co is supplied from an oil source (not shown) via an oil pipe 25. The control 11 oil CO sent to the mechanical trip valve 1 via the oil feed pipe 25 normally passes through the mechanical trip valve 1 and its outlet pipe 26.
The electrical lockout valve is supplied to the lockout valve 21 and is also supplied to the electrical trip valve 22 via its outlet piping 27, and is further connected to the outlet side of the electrical trip valve 22 via an outlet piping 29. The emergency oil pressure 2 is supplied through the valve 30 to a valve (not shown) provided at the inlet of the turbine or the like.

In addition, both the trip valves 1.22 are provided with emergency oil pressure 2, which recovers the control oil CO supplied to the valves when the trip is activated.
An oil tank 3.28 is connected respectively to reduce the pressure of. Further, one end of a bypass line 31 is connected to the outlet pipe 26 of the mechanical trip valve 1, and the other end of the bypass line 31 is connected to the lockout valve 21.
, bypassing the electrical trip valve 22 and being connected to the electrical lockout valve 30.

Further, as shown in FIG. 2, control oil CO is supplied to the lockout valve 21 from a hydraulic source (not shown) via an oil feed pipe 32 that is completely separate from the oil feed pipe 25. This oil feed pipe 32 is provided with a hydraulic main valve 33 .

Next, the operation of the second embodiment described above will be explained.

During normal operation, control oil CO is supplied to the oil supply pipe 25, mechanical trip valve 1, outlet pipe 26, and lockout valve 2.
1. Outlet pipe 27, electrical trip valve 22, outlet pipe 29, and electrical lockout valve 30
The hydraulic pressure is sequentially supplied through valves, and acts as an emergency hydraulic pressure 2 on a valve (not shown) provided at the inlet of the turbine, etc. This keeps the valve open.

Either the mechanical trip valve 1 or the electrical trip valve 22 is switched to the trip side and the first
When the situation shown in the figure occurs, the control oil CO supplied to the surface valve is collected into the oil tank 3 or 28, and the emergency oil pressure 2 decreases in pressure, causing the valve to close suddenly and causing a turbine trip. It will be done.

On the other hand, when testing the trip valves 1 and 22 during turbine operation, the following procedure is used.

That is, first, when testing the mechanical trip valve 1, the lockout valve 21 is locked out and the control oil C is
O is switched from the oil feed pipe 25 side to the oil feed pipe 32 side. In this state, the mechanical trip valve 1 is tested.

If there is no abnormality as a result of the test, mechanical trip valve 1
at the same time as switching the lockout valve 21 to the reset side.
Switch to release the lockout.

If there is any abnormality in the mechanical trip valve 1 as a result of the test, the hydraulic main valve 24 is stopped while the lockout valve 21 is locked out to prevent control oil CO from being supplied to the mechanical trip valve 1 via the oil pipe 25. Make it. Then, in this state, the mechanical trip valve 1 is repaired or replaced, and then the mechanical trip valve 1 is switched to the reset side, the oil pressure source valve 24 is opened, and the lockout valve 21 is switched to release the lockout.

Note that if it is necessary to trip the turbine during the test of the mechanical trip valve 1, the electric trip valve 22 is switched to the trip side by the turbine trip electric signal, and the turbine is tripped.

When testing the electrical trip valve 22, both the double-ended pullout valves 21 and 30 are switched to the lockout side. As a result, the control oil CO sent via the oil pipe 25 is transferred to the mechanical trip valve 1 and the outlet pipe 26.
, the bypass line 31 and the electrical lockout valve 30 to a valve (not shown) provided at the inlet of the turbine, etc., and the control oil Co sent via the oil feed pipe 32 to the lockout valve. 21 and outlet piping 2
7 to the electrical trip valve 22. Therefore, the electrical trip valve 22 is tested in this state.

If there is no abnormality as a result of test 1-, the electric trip valve 22 is switched to the reset side, and the double-ended pullout valves 21 and 30 are switched to release the lockout.

If the test results show that there is an abnormality in the electrical trip valve 22, the hydraulic main valve 33 is closed while the double-ended pullout valve 21°30 is switched to the lockout side, and the control oil C
Prevent O from being supplied to the electrical trip valve 22 via the oil pipe 32. In this state, the electrical trip valve 22 is repaired or replaced, and then the electrical 1-lip valve 22 is switched to the reset side, the hydraulic pressure source valve 33 is opened, and the double-ended pullout valves 21 and 30 are switched to prevent lockout. unlock.

If it becomes necessary to trip the turbine during the test of the electric trip valve 22, the mechanical trip valve 1 is switched to the trip side by the operation of the emergency trip device, and the turbine is tripped.

In this way, the mechanical trim valve 1 is
In addition to being able to test the electrical trip valve 22, it also becomes possible to repair or replace it.

In addition, since the oil feed pipe 25 and the oil feed pipe 32 are on completely different lines, even if oil pressure fluctuations occur due to the test operation of each trip valve 1.22, the effect on the emergency oil pressure 2 can be virtually ignored. Can be made smaller. Therefore, there is no risk of accidentally tripping the turbine.

In both of the above-mentioned embodiments, the hydraulic main valve 24.33 is a manual valve, but an electric valve or a solenoid valve may also be used, or a three-way valve may be used and a mechanical Trip valve 1 or lockout valve 21
The control oil CO sent to the pump may be made to flow into the bypass line 23 or the other oil feed pipe 32.25.

Furthermore, in both embodiments, a lockout valve 21.30 is provided on the outlet side of the trip valve 1.22.
A rear valve may be provided to shut off the hydraulic pressure.

Further, the present invention is not limited to a single-shaft turbine, but can also be applied to a turbine having two or more shafts, such as a cross compound turbine.

〔Effect of the invention〕

As explained above, the present invention is provided with a valve on the inlet side of the first trip valve that can disconnect the first trip valve from the fluid pressure source, so it is possible to test the first trip valve during turbine operation. In addition, if an abnormality occurs in the first trip valve, it can be repaired or replaced without tripping the turbine.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a first embodiment of a turbine safety device according to the present invention, Fig. 2 is a system diagram showing a second embodiment of the invention, and Fig. 3 is a configuration showing a general emergency trip device. FIG. 4 is a system diagram showing a conventional turbine safety device. 1... Mechanical trip valve, 2... Emergency hydraulic pressure, 2
1...Lockout valve, 22...Electrical trip valve, 23.31...Bypass line, 24゜3
3...Hydraulic source valve, 25.32...Oil pipe, 30...
・Electrical lockout valve, CO...control oil. Applicant's agent Kiyoshi Inomata 82 Figure 4

Claims (1)

[Claims] 1. A normally open valve that is closed by fluid pressure from a fluid pressure source and shuts off energy flowing into the turbine, and an emergency trip device provided between the fluid pressure source and the normally open valve. The first valve is switched by the actuation and releases the fluid pressure acting on the normally open valve.
a trip valve, a test valve provided on the outlet side of the first trip valve and activated during a test of the first trip valve to connect the fluid pressure source and the normally open valve bypassing the first trip valve; a second trip valve provided on the outlet side of the test valve and switched by an emergency trip signal to release the fluid pressure acting on the normally open valve; the first trip valve being operated by the operation of the test valve; In addition to making testing possible,
In the turbine safety device that enables a turbine trip during a first trip valve test by operating the second trip valve, the first trip valve is disconnected from the fluid pressure source on the inlet side of the first trip valve during turbine operation. A turbine safety device characterized in that a valve is provided to enable repair and replacement of the first trip valve. 2. A line connecting the fluid pressure source and the first trip valve;
Turbine safety according to claim 1, characterized in that the line that bypasses the first trip valve and connects the fluid pressure source and the normally open valve is a separate line that does not have a common part. Device.