JP5922909B2 - Steam turbine control device and steam turbine equipment using the same - Google Patents

Description

  The present invention relates to a steam turbine control device and a steam turbine facility using the same, and more particularly to a steam turbine control device for driving a cooling pump at the time of reactor isolation and a steam turbine facility using the same.

  A steam turbine of a cooling system (hereinafter referred to as RCIC) at the time of reactor isolation drives a feed water pump that supplies cooling water to the reactor in an emergency of the reactor such as when the feed water to the reactor is stopped. For this reason, such a feed water pump driving steam turbine speeds up the feed water pump that is driven within a specified time (for example, 30 seconds) to a rotation speed at which the required feed water flow rate can be supplied after the start signal is input. It is requested.

  In order to enable such rapid start-up, the RCIC steam turbine is provided upstream of the steam inlet of the feed water pump and hydraulic pump directly connected to the rotating shaft and the steam turbine, and is closed during normal operation of the reactor. The steam inlet valve that opens in the event of an emergency, and is provided downstream of the steam inlet valve. The steam control valve to be controlled, the steam control valve drive actuator that can control the opening of the steam control valve by driving the piston connected to the valve rod of the steam control valve by the link mechanism, and the hydraulic pump An electric oil converter that controls the supply amount of pressure oil supplied to the actuator; and a turbine control device that outputs a control command to the electric oil converter to set the rotation speed of the steam turbine to a target rotation speed. There.

  When the steam turbine rotates, the pressure oil generated in the hydraulic pump driven by its shaft as power is supplied to the steam control valve drive actuator via the electric oil converter, and the fully open holding spring is contracted to reduce the steam. Controls the opening of the adjusting valve. A steam control valve that prevents the entry of air into the hydraulic system that drives and controls such a steam control valve, and does not deteriorate the start-up characteristics of the steam turbine for driving the feed water pump even if air enters the system. There exists a control apparatus (for example, refer patent document 1).

JP 2004-108965 A

  The procedure for stopping the RCIC steam turbine after starting it is as follows. First, the steam stop valve and the steam inlet valve between the steam inlet valve and the steam control valve are closed to shut off the steam inflow to the turbine. Then, in preparation for the next start-up, the steam control valve is brought into a fully open holding state.

  In the turbine stop process, since the rotational speed of the hydraulic pump is gradually reduced, the pressure oil pressure generated by the hydraulic pump is also gradually reduced. During this time, the steam control valve continues to be controlled by the turbine rotational speed control signal using the piston drive torque of the steam control valve drive actuator, but the piston drive torque decreases as the pressure oil pressure decreases. As a result, if the extension force of the fully open holding spring provided on the valve rod of the steam control valve exceeds the piston drive torque described above, the fully open holding spring will connect the piston of the steam control valve drive actuator and the steam control valve. Move to the fully open position. At this time, the pressure oil remaining in the steam control valve drive actuator is discharged out of the steam control valve drive actuator by the movement of the piston.

  The discharge of the pressure oil in the steam control valve drive actuator is performed via the electric oil converter, but the resistance for discharging the pressure oil increases depending on the type of the electric oil converter. For this reason, it is necessary to increase the spring force of the fully open holding spring necessary for fully opening the steam control valve and the steam control valve driving actuator. Increasing the spring force of the fully open holding spring is advantageous for opening the steam control valve in the turbine stop process. On the other hand, in the turbine start-up process, the pressure of the pressure oil for controlling the steam control valve in the closing direction is increased, which necessitates an increase in the size of a hydraulic device such as a hydraulic pump or a steam control valve drive actuator. End up. In addition, the operation speed of the steam control valve is delayed, and the operability may be impaired.

  The present invention has been made on the basis of the above-mentioned matters. The purpose of the present invention is to provide a steam control valve in the turbine stop process without strengthening the spring force of the fully open holding spring of the steam control valve of the RCIC steam turbine. It is an object of the present invention to provide a steam turbine control device that can be held fully open reliably and a steam turbine facility using the same.

In order to achieve the above object, a first invention is provided with a steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, an upstream side of a steam inlet of the steam turbine, and the nuclear reactor The steam inlet valve that closes at the normal time and opens in an emergency, and provided at the downstream side of the steam inlet valve, is fully opened at the normal time of the reactor by the extension force of the fully open holding spring provided on the valve stem, In the event of an emergency, a steam control valve that is controlled from the fully open to the closing direction, and a steam control valve drive that can control the opening of the steam control valve by driving a piston mechanically connected to the valve rod of the steam control valve And a hydraulic pump mechanically connected to the rotating shaft of the steam turbine, and the steam adjusting valve discharged from the hydraulic pump and connected to the hydraulic pump and the steam control valve driving actuator via a conduit. Driving An electric oil converter that controls a supply amount of pressure oil supplied to the actuator for the engine, and a steam turbine control device that drives and controls the steam control valve with the steam control valve drive actuator. Rotation state quantity detecting means for detecting the amount, and the rotational state quantity of the steam turbine detected by the rotation state quantity detection means, and in the process of stopping the steam turbine, the rotation state quantity of the steam turbine is set in advance. Control means for outputting a command for fully opening the steam control valve driving actuator to the electro-oil converter when a value below the value is detected.

The second invention is provided on the upstream side of the steam inlet of the steam turbine for driving the feed water pump for urgently supplying cooling water to the reactor and the steam inlet of the steam turbine. A steam inlet valve that opens at times, and is provided on the downstream side of the steam inlet valve, and is fully open during normal operation of the reactor by the extension force of the fully open holding spring provided on the valve stem. A steam control valve to be controlled, a steam control valve drive actuator capable of controlling the opening of the steam control valve by driving a piston mechanically connected to a valve rod of the steam control valve, and the steam turbine a hydraulic pump which is mechanically connected to a rotating shaft of the hydraulic pump and through the steam control valve drive actuator and the flow path connected, discharged from the hydraulic pump subjected to the steam control valve drive actuator An electric oil converter for controlling the amount of pressure oil supplied, and detecting the rotational state amount of the steam turbine in a steam turbine control device that drives and controls the steam control valve by the steam control valve drive actuator Rotation state quantity detection means and rotation state quantity of the steam turbine detected by the rotation state quantity detection means are taken in, and in the stop process of the steam turbine, whether or not the rotation state quantity of the steam turbine is equal to or less than a preset specified value a trigger calculation unit determines whether to calculate the opening command of the steam control valve based on the target rotation speed and a rotation state amount of the steam turbine of the steam turbine, determination signal from the trigger calculation unit when before the KiHiraki degree command is outputted to the electro-hydraulic converter, when the determination signal from the trigger calculation unit is positive to the electro-hydraulic converter full opening command of the steam control valve And that a control unit and a steam control valve opening instruction calculation unit for force.

Furthermore, the third invention, in the second invention, the steam control valve opening instruction calculation unit, a signal switching determination signal from the trigger calculation unit, before when the switching signal is negative KiHiraki degree A switching arithmetic unit is provided that outputs a command to the electro-oil converter and, when the switching signal is positive, outputs a fully open command for the steam control valve to the electro-oil converter.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the prescribed value preset in the control means is that the pressure oil from the hydraulic pump drives the steam control valve drive actuator. It is characterized by being set to the required hydraulic pressure.

  Furthermore, a fifth invention is characterized in that, in any one of the first to fourth inventions, the rotational state quantity detecting means is a rotational speed detector provided on a rotary shaft of the steam turbine.

  According to a sixth aspect, in the first aspect, the rotational state amount detecting means is a pressure sensor that detects a discharge pressure of the hydraulic pump.

  Furthermore, a seventh invention is a steam turbine facility, characterized in that any one of the first to sixth inventions is provided.

  According to the present invention, since the steam turbine control device outputs a command to open the steam control valve drive actuator to the electro-oil converter at a predetermined time in the turbine stop process, the resistance of the electro-oil converter is small. In this state, the steam control valve can be fully opened reliably. Thus, the fully open holding spring has a spring force necessary to maintain the open state of the steam control valve and the steam control valve drive actuator when the steam turbine is stopped and the drive hydraulic pressure is lost. Therefore, it is not necessary to strengthen the spring force. As a result, it is possible to reduce the size of equipment such as a hydraulic device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing the configuration of an RCIC steam turbine facility equipped with an embodiment of a steam turbine control device of the present invention and a steam turbine facility using the same. It is a control block diagram which shows the processing content of one Embodiment of the steam turbine control apparatus and steam turbine equipment using the same of this invention. It is a characteristic view which shows starting operation | movement of the steam turbine of RCIC provided with one Embodiment of the steam turbine control apparatus of this invention, and a steam turbine equipment using the same. It is a characteristic view which shows the stop operation | movement of the steam turbine of RCIC provided with one Embodiment of the steam turbine control apparatus of this invention, and a steam turbine equipment using the same.

  Embodiments of a steam turbine control device and a steam turbine facility using the same according to the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing the configuration of a steam turbine facility of an RCIC equipped with an embodiment of a steam turbine control device of the present invention and a steam turbine facility using the same.

  1, the steam turbine equipment in the RCIC system includes an RCIC steam turbine 2 driven by steam from a reactor 1 that is a steam generation source, and a feed water pump 3 in which the RCIC steam turbine 2 and a rotating shaft are mechanically connected. And a hydraulic pump 4.

  At the time of emergency cooling of the nuclear reactor 1, for example, water in a cooling water tank is sucked up by the feed water pump 3 and poured into the nuclear reactor 1. The RCIC steam turbine 2 that drives the feed water pump 3 is provided with a steam inlet valve 5 that closes the steam generated in the nuclear reactor 1 at a normal time and opens in an emergency, and a downstream side of the steam inlet valve 5. It is fully opened at the normal time by the extension force of the fully open holding spring 7 provided at 6a, taken in via the steam control valve 6 controlled from the fully open to the closing direction in an emergency, and rotated as a power source.

  When the RCIC steam turbine 2 rotates, a hydraulic pump 4 driven by its shaft as a motive power operates to suck oil from the oil tank 8, and the pressure is supplied to the electric oil converter 9 constituting the hydraulic system via the pipe line 4a. Supply oil. The electric oil converter 9 adjusts the supply flow rate of the pressure oil to the steam control valve drive actuator 10 based on a command signal from the control device 20 described later, and discharges the oil from the steam control valve drive actuator 10. Discharge into the oil tank 8. Thus, the piston rod 10a of the steam control valve driving actuator 10 is driven. The electro-oil converter 9 and the steam control valve driving actuator 10 are connected by a pipe line 9a, and the electro-oil converter 9 and the oil tank 8 are connected by a pipe line 9b.

  The tip of the piston rod 10 a of the steam control valve driving actuator 10 is connected to the valve rod 6 a of the steam control valve 6 via the link mechanism 11. Therefore, by controlling the drive amount of the piston rod 10a of the steam control valve drive actuator 10, the drive amount of the valve rod 6a of the steam control valve 6 is controlled in the closing direction against the extension force of the fully open holding spring 7. Thus, the opening degree of the steam control valve 6 can be controlled.

  The pressure sensor (rotational state amount detection means) 12 detects the pressure in the pipe line 4 a connecting the hydraulic pump 4 and the electro-hydraulic converter 9. A rotation speed detector (rotation state quantity detection means) 13 is provided in the vicinity of the rotation shaft of the RCIC steam turbine 2 in order to detect the rotation speed of the RCIC steam turbine 2. The discharge pressure detection signal of the hydraulic pump 4 from the pressure sensor 12 and the rotation speed detection signal of the RCIC steam turbine 2 from the rotation speed detector 13 are input to the control device 20.

  The control device (control means) 20 is based on the detection signals from the pressure sensor 12 and the rotational speed detector 13 and the input unit for taking in the signal from the main control device 200 which is a host control device, and based on these detection signals. A calculation unit that executes calculation processing to be described later, a storage unit that stores in advance each set value used in the calculation unit, and an output unit that outputs a control command calculated by the calculation unit to the electro-oil converter 9 are provided. .

  The controller 20 reduces the deviation between the target rotational speed of the RCIC steam turbine 2 from the main controller 200 and the actual rotational speed of the RCIC steam turbine 2 from the rotational speed detector 13 during emergency cooling. An opening degree command of the steam control valve 6 is calculated and output to the electric oil converter 9, and the amount of steam flowing into the steam turbine 2 of the RCIC is controlled. The electro-oil converter 9 controls the flow rate of the pressure oil discharged from the hydraulic pump 4 driven by the turbine rotation shaft and supplied to the steam control valve driving actuator 10 in accordance with the opening degree command signal from the control device 20. The drive amount of the piston rod 10a of the steam control valve driving actuator 10 is controlled. Since the piston rod 10a of the steam control valve driving actuator 10 is connected to the valve rod 6a of the steam control valve 6 via the link mechanism 11, the steam control valve 6 can be controlled by controlling the drive amount of the piston rod 10a. To control the opening degree.

  Next, the outline | summary of the control apparatus 20 is demonstrated using FIG. FIG. 2 is a control block diagram showing the processing contents of an embodiment of the steam turbine control device of the present invention and the steam turbine equipment using the same. In FIG. 2, the same reference numerals as those shown in FIG.

  The control device 20 shown in FIG. 2 shows a controller unit that performs the opening degree control of the steam control valve 6 of the steam turbine 2 of the RCIC, and generates a trigger signal for switching the command value of the output signal based on the input signal. A trigger signal calculation unit 20A and a steam control valve opening command calculation unit 20B that calculates a steam control valve opening command output to the electro-oil converter 9 are provided.

  As shown in FIG. 2, for example, a turbine start signal, a turbine stop process signal, and a feed water pump speed command are input to the control device 20 from the main control device 200 that is a host control device. In addition, detection signals from the pressure sensor 12 and the rotation speed detector 13 are input. These signals are generated in the trigger signal calculation unit 20A, the turbine start signal is the digital input signal 200Di1, the turbine stop process signal is the digital input signal 200Di2, the turbine rotation speed signal is the analog input signal 13Ai, and the hydraulic pump discharge pressure signal is analog. Each is converted into an input signal 12Ai. Further, the feed valve speed command 200Ai from the main control device 200, which is a host control device, is input to the steam control valve opening command calculation unit 20B.

  The trigger signal calculation unit 20A includes signal generators 21 and 23, comparison operation units 22 and 24, a logical sum operation unit 25, an AND operation units 26 and 29, an instantaneous operation time limit return type time limit operation unit 27, And a negative operation unit 28.

  The signal generator 21 is set with a signal equal to or lower than the lower limit value of the normal control range of the RCIC steam turbine 2, and the discharge pressure of the hydraulic pump 4 driven at this rotational speed is determined by the steam adjusting valve driving actuator 10. It must be drivable. In the present embodiment, for example, 500 rpm is set when the lower limit value of the normal control range is 1000 rpm. The comparison calculator 22 receives the rotational speed detection signal 13Ai of the RCIC steam turbine 2 from the rotational speed detector 13 as a first input and the output signal of the signal generator 21 as a second input, and the first input <second When input, 1 is output as the digital output signal 22Do.

  In the signal generator 23, a signal having a value obtained by adding a margin value to the lower limit value of the discharge pressure of the hydraulic pump 4 necessary for driving the steam control valve driving actuator 10 is set. In the present embodiment, for example, 1 MPa is set when the lower limit value of the discharge pressure of the hydraulic pump 4 described above is 0.5 MPa. This set value is preferably set to a value approximately equal to the discharge pressure of the hydraulic pump 4 driven by the rotational speed of the RCIC steam turbine 2 set by the signal generator 21. The comparison calculator 24 receives the discharge pressure detection signal 12Ai of the hydraulic pump 4 from the pressure sensor 12 as a first input and the output signal of the signal generator 23 as a second input, and when the first input <the second input 1 is output as the digital output signal 24Do.

  The logical sum calculator 25 receives the output signal 22Do of the comparison calculator 22 as a first input and the output signal 24Do of the comparison calculator 24 as a second input. When either of the input signals is 1, the digital output The signal 25Do is output as 1.

  The AND operator 26 receives the turbine stop process signal 200Di2 from the main controller 200, which is a host controller, as a first input and the output signal 25Do of the OR operator 25 as a second input. Is also 1, the digital output signal 26Do is output as 1. Here, the turbine stop process signal refers to a process in which the RCIC steam turbine 2 started during emergency cooling of the reactor 1 is stopped by performing a stop operation.

  The time limit calculator 27 receives the output signal 26Do of the logical product calculator, and outputs the digital output signal 26Do as 1 in the instantaneous operation time limit return operation according to the input signal. In other words, when the input signal is 1, the digital output signal 26Do is output as 1 instantaneously, and when the input signal changes to 0, the digital output signal 26Do is set to 0 after a preset time (time limit characteristic) has elapsed. Output. In the present embodiment, the time limit characteristic is set to 600 seconds, for example.

  The negative calculator 28 receives the turbine start signal 200Di1 from the main controller 200, which is a host controller, and outputs a negative signal of the input signal as a digital output signal 28Do.

  The AND operator 29 receives the output signal 28Do of the negative operator 28 as a first input and the output signal 27Do of the time limit calculator 27 as a second input. When both input signals are 1, the digital output signal 29Do is output as 1. Here, the turbine activation signal 200Di1 is a signal for instructing activation of the steam turbine 2 of the RCIC during emergency cooling of the nuclear reactor 1.

  The steam control valve opening command calculation unit 20B includes a subtraction calculator 30, a control calculator 31, a signal generator 32, and a switching calculator 33.

  The subtraction calculator 30 receives the feed water pump speed command 200Ai from the main controller 200, which is the host controller, as a first input, and the rotational speed detection signal 13Ai of the RCIC steam turbine 2 from the rotational speed detector 13 as a second input. And the subtraction of the second input signal from the first input signal, and the deviation signal is output to the control arithmetic unit 31 as the output signal 30Ao. Here, the feed water pump speed command 200 </ b> Ai is a feed water pump rotation speed command capable of supplying a feed water flow rate required to maintain the water level of the nuclear reactor 1 during emergency cooling of the nuclear reactor 1.

  The control calculator 31 receives the output signal 30Ao of the subtraction calculator 30, and calculates the opening command signal of the steam control valve 6 so as to eliminate the speed deviation that is the input signal. The calculated output signal 31Ao is output to the first input of the switching calculator 33.

  The signal generator 32 is set with an opening command signal that can fully open the steam control valve 6, and outputs the signal to the second input of the switching calculator 33. In the present embodiment, for example, a 120% opening degree command signal is set.

  The switching calculator 33 receives the output signal 31Ao of the control calculator 31 as a first input, the output signal of the signal generator 32 as a second input, and the digital output signal 29Do from the AND calculator 29 as a switching signal. doing. When the digital output signal 29Do that is the switching signal is 1, the switching calculator 33 outputs the output value of the signal generator 32 that is the second input as the output signal 33Ao. When the input switching signal 29Do is 0, the output value 31Ao of the control arithmetic unit 31 as the first input is output as the output signal 33Ao. The output signal 33Ao of the switching calculator 33 is converted into, for example, a current signal at the output unit, and is output to the electro-oil converter 9 as an opening degree command for the steam control valve 6.

  Next, the operation of the steam turbine of the RCIC to which the embodiment of the steam turbine control device of the present invention having the above configuration is applied will be described with reference to FIGS. FIG. 3 is a characteristic diagram showing a start-up operation of a steam turbine of an RCIC equipped with an embodiment of a steam turbine control device of the present invention and a steam turbine facility using the same, and FIG. 4 is a steam turbine control device of the present invention and the same. It is a characteristic view which shows the stop operation | movement of the steam turbine of RCIC provided with one embodiment of the steam turbine equipment which used NO. 3 and 4, the same reference numerals as those shown in FIG. 1 and FIG. 2 are the same parts, and detailed description thereof is omitted.

First, the starting operation of the RCIC steam turbine 2 will be described.
In FIG. 3, the horizontal axis indicates time, and the vertical axes (a) to (e) indicate the start signal 200Di1 of the RCIC steam turbine 2, the opening degree Ivs of the steam inlet valve 5, and the steam control valve 6 in order from the top. The opening degree Cvs, the rotational speed 13Ai of the steam turbine 2 of RCIC, and the discharge pressure 12Ai of the hydraulic pump 4 are shown.

  At time t1, which is the time of emergency cooling of the nuclear reactor 1, the start signal 200Di1 of the RCIC steam turbine 2 is output from the main controller 200, which is the host controller, and the steam inlet valve 5 is opened. When the steam inlet valve 5 is opened, the steam control valve 6 is held fully open, so that the steam flows into the RCIC steam turbine 2 from the reactor 1 so that the rotational speed 13Ai of the RCIC steam turbine 2 is increased. Rises rapidly.

  As the rotational speed of the steam turbine 2 of the RCIC increases, the hydraulic pressure supplied by the hydraulic pump 4 is established, and the steam control valve 6 can be driven. By controlling the amount of oil supplied to the steam control valve drive actuator 10 by the electric oil converter 9 in accordance with the command of the control device 20, a turbine corresponding to the feed water pump speed command 200Ai from the main control device 200 which is a host control device. The opening degree of the steam control valve 6 is controlled so as to achieve the rotation speed. After the RCIC steam turbine 2 is started, a predetermined rotational speed is reached at time t2.

Returning to FIG. 2, the operation of the control device 20 will be described.
In the trigger signal calculation unit 20A of FIG. 2, the start signal 200Di1 of the RCIC steam turbine 2 which is the input signal of the negative calculator 28 is 1, so the digital output signal 28Do of the negative calculator 28 outputs 0. Further, since the turbine stop process signal 200Di2 which is the first input signal of the AND operator 26 is 0, the digital output signal 26Do of the AND operator 26 outputs 0, and the digital output signal 27Do of the time limit calculator 27 is output. Outputs 0. Therefore, the digital output signal 29Do of the AND operator 29 outputs 0.

  As a result, the switching calculator 33 of the steam control valve opening command calculation unit 20B outputs the output signal 31Ao of the control calculator 31 which is the first input. As a result, the electric oil converter 9 receives the feed water pump speed command 200Ai from the main controller 200, which is the host controller, and the rotational speed detection signal 13Ai of the RCIC steam turbine 2 from the rotational speed detector 13. An opening degree command signal for the steam control valve 6 is output so as to eliminate the deviation. Here, the feed water pump speed command 200Ai is ramped up to the rated rotational speed at startup (time t1 to t2 in FIG. 3), and after reaching a predetermined rotational speed (after time t2 in FIG. 3). Is calculated by the main controller 200, which is a host controller, for the purpose of maintaining the water level of the nuclear reactor 1.

Next, the stop operation of the RCIC steam turbine 2 will be described.
In FIG. 4, the horizontal axis indicates time, and the vertical axes (a) to (e) indicate the stop signal S of the steam turbine 2 of the RCIC, the opening degree Ivs of the steam inlet valve 5, and the steam control valve 6 in order from the top. The opening degree Cvs, the rotational speed 13Ai of the steam turbine 2 of RCIC, and the discharge pressure 12Ai of the hydraulic pump 4 are shown.

  At time t1 when the RCIC steam turbine 2 is stopped, a stop signal S for the RCIC steam turbine 2 is output from the main controller 200, which is the host controller, and the steam inlet valve 5 is closed. The steam stop valve (not shown) provided in the steam pipe between the steam control valve 6 and the steam inlet valve 5 is closed. When the steam stop valve or the steam inlet valve 5 is closed, the flow of steam from the nuclear reactor 1 to the RCIC steam turbine 2 is shut off, so the rotational speed 13Ai of the RCIC steam turbine 2 decreases. At this time, the turbine stop process signal 200Di2 is output from the main control device 200, which is the host control device, to the control device 20.

  As the rotational speed 13Ai of the RCIC steam turbine 2 decreases, the discharge pressure 12Ai of the hydraulic pump 4 also decreases. The steam control valve opening degree Cvs is controlled in the opening direction so as to keep the RCIC steam turbine 2 at a predetermined rotational speed. In this way, the turbine stop process proceeds. When detecting that the rotational speed 13Ai of the RCIC turbine 2 is equal to or less than a specified value at time t2 after the stop operation of the steam turbine 2 of the RCIC, the control device 20 detects the detection signal from the rotational speed detector 13 or the pressure sensor 12. Then, a command is output to the electric oil converter 9 so that the steam control valve 6 is fully opened, and the steam control valve drive actuator 10 is opened in the turbine stop process.

Returning to FIG. 2, the operation of the control device 20 will be described.
In the trigger signal calculation unit 20A of FIG. 2, the start signal 200Di1 of the RCIC steam turbine 2 that is the input signal of the negative calculator 28 is 0, so the digital output signal 28Do of the negative calculator 28 outputs 1. Further, when the rotational speed signal 13Ai of the RCIC steam turbine 2 of the first input of the comparison calculator 22 falls and becomes equal to or lower than 500 rpm which is the output signal of the signal generator 21 of the second input of the comparison calculator 22, the comparison is made. The digital output signal 22Do of the calculator 22 outputs 1. Further, when the discharge pressure signal 12Ai of the first input hydraulic pump 4 of the comparison calculator 24 drops and becomes 1 MPa or less which is the output signal of the second input signal generator 23 of the comparison calculator 24, the comparison calculator The 24 digital output signals 24Do output 1. When either the digital output signal 22Do of the comparison arithmetic unit 22 that is the first input of the logical sum calculator 25 or the digital output signal 24Do of the comparison arithmetic unit 24 that is the second input of the logical sum calculator 25 is 1. In addition, the digital output signal 25Do of the logical sum calculator 25 outputs 1.

  Since the turbine stop process signal 200Di2 which is the first input signal of the logical product operator 26 is 1, when the digital output signal 25Do of the logical sum operator 25 outputs 1, the digital output signal 26Do of the logical product operator 26 is 1. And the digital output signal 27Do of the time limit calculator 27 outputs 1. The digital output signal 28Do of the negative operator 28, which is the first input signal of the logical product operator 29, is 1, and the digital output signal 27Do of the time limiter 27, which is the second input signal of the logical product operator 29, is 1. For this reason, the digital output signal 29Do of the AND operator 29 outputs 1.

  As a result, the switching calculator 33 of the steam control valve opening command calculation unit 20B outputs a 120% opening command signal that is an output signal of the signal generator 32 that is the second input. As a result, an opening degree command signal for driving the steam control valve driving actuator 10 to fully open the steam control valve 6 is output to the electric oil converter 9.

  According to the above-described embodiment of the steam turbine control device and the steam turbine equipment using the same according to the present invention, the steam control valve drive actuator from the control device 20 to the electric oil converter 9 at a predetermined time in the turbine stop process. Since the command which makes 10 open state standby is output, the steam control valve 6 can be fully opened reliably in the state where the resistance of the electro-oil converter 9 is small. Thus, the fully open holding spring 7 is necessary for maintaining the open state of the steam control valve 6 and the steam control valve drive actuator 10 when the RCIC steam turbine 2 is stopped and the drive hydraulic pressure is lost. Since it is sufficient to have only a spring force, it is not necessary to reinforce the spring force. As a result, it is possible to reduce the size of equipment such as a hydraulic device.

  Further, according to the embodiment of the steam turbine control device of the present invention and the steam turbine equipment using the same, it is not necessary to reinforce the spring force of the fully open holding spring 7. Excellent operability can be ensured in control during normal operation.

  In the present embodiment, the valve rod 6a of the steam control valve 6 and the piston rod 10a of the steam control valve driving actuator 10 are connected by the link mechanism 11, but the present invention is not limited to this. Absent. What is necessary is just to connect both mechanically.

  Further, in the present embodiment, the timing of switching the full opening command of the steam control valve 6 during the stop process of the RCIC steam turbine 2 is determined by a detection signal from the rotational speed detector 13 or the pressure sensor 12 as the rotational state quantity detection means. Although described in the example of detection, it is not limited to this. As long as it can be detected that the rotational speed 13Ai of the steam turbine 2 of the RCIC has become a specified value or less, it may be configured by only one of the detection signals.

DESCRIPTION OF SYMBOLS 1 Reactor 2 RCIC steam turbine 3 Feed water pump 4 Hydraulic pump 5 Steam inlet stop valve 6 Steam control valve 7 Fully open spring 8 Oil tank 9 Electro-oil converter 10 Steam control valve drive actuator 11 Link mechanism 12 Pressure sensor 13 Rotational speed detector 20 Controller 20A Trigger signal calculator 20B Steam control valve opening command calculator 200 Main controller

Claims (7)

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, and a steam inlet valve provided on the upstream side of the steam inlet of the steam turbine, which is closed during normal operation of the nuclear reactor and opened in an emergency. A steam control valve that is provided on the downstream side of the steam inlet valve and that is normally opened by the extension force of the fully-opening holding spring provided on the valve rod, and that is controlled from the fully open to the closing direction in an emergency. A steam control valve drive actuator that controls the opening of the steam control valve by driving a piston mechanically connected to the valve rod of the steam control valve, and mechanically connected to the rotation shaft of the steam turbine the hydraulic pump, the hydraulic pump and through the steam control valve drive actuator and the flow path connecting the supply amount before Symbol discharged from the hydraulic pump pressure oil supplied to the steam control valve drive actuator And a control for electro-hydraulic transducer, in a steam turbine control apparatus for controlling driving the steam control valve by the steam control valve drive actuator,
A rotational state amount detecting means for detecting a rotational state amount of the steam turbine;
When the rotational state quantity of the steam turbine detected by the rotational state quantity detection means is taken and the rotational state quantity of the steam turbine is detected to be equal to or less than a predetermined value in the process of stopping the steam turbine, A steam turbine control device comprising: control means for outputting a command for fully opening the valve drive actuator to the electro-oil converter. A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, and a steam inlet valve provided on the upstream side of the steam inlet of the steam turbine, which is closed during normal operation of the nuclear reactor and opened in an emergency. A steam control valve that is provided on the downstream side of the steam inlet valve and that is normally opened by the extension force of the fully-opening holding spring provided on the valve rod, and that is controlled from the fully open to the closing direction in an emergency. A steam control valve drive actuator that controls the opening of the steam control valve by driving a piston mechanically connected to the valve rod of the steam control valve, and mechanically connected to the rotation shaft of the steam turbine was a hydraulic pump, connected via the hydraulic pump and the steam control valve drive actuator and the flow path, the supply amount of the hydraulic fluid supplied to be discharged from the hydraulic pump the steam control valve drive actuator And a control for electro-hydraulic transducer, in a steam turbine control apparatus for controlling driving the steam control valve by the steam control valve drive actuator,
A rotational state amount detecting means for detecting a rotational state amount of the steam turbine;
A trigger calculation unit that takes in the rotation state amount of the steam turbine detected by the rotation state amount detection means and determines whether the rotation state amount of the steam turbine is equal to or less than a predetermined value in a stop process of the steam turbine. when the target rotational speed of the steam turbine and a rotation state amount of the steam turbine to calculate the opening command of the steam control valve based, previously when the determination signal from the trigger calculation unit is negative KiHiraki degree A steam control valve opening command calculation unit for outputting a command to the electro-oil converter, and outputting a full-open command of the steam control valve to the electro-oil converter when the determination signal from the trigger calculation unit is positive. A steam turbine control device comprising: a control means having a control means. The steam turbine control device according to claim 2, wherein
The steam control valve opening instruction calculation unit, a signal switching determination signal from the trigger calculation unit, when the switching signal is negative and outputs the pre KiHiraki degree command to the electro-hydraulic converter, the switching signal A steam turbine control device, comprising: a switching arithmetic unit that outputs a full opening command of the steam control valve to the electro-oil converter when is positive. In the steam turbine control device according to any one of claims 1 to 3,
The steam turbine control device according to claim 1, wherein the specified value preset in the control means is set to a hydraulic pressure necessary for the pressure oil from the hydraulic pump to drive the actuator for driving the steam control valve. In the steam turbine control device according to any one of claims 1 to 4,
The said rotation state amount detection means is a rotational speed detector provided in the rotating shaft of the said steam turbine. The steam turbine control apparatus characterized by the above-mentioned. The steam turbine control device according to claim 1,
The steam turbine control device, wherein the rotational state quantity detection means is a pressure sensor that detects a discharge pressure of the hydraulic pump. A steam turbine equipment comprising the steam turbine control device according to any one of claims 1 to 6.

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