JP5823167B2 - Steam valve device - Google Patents

Description

  Embodiments according to the present invention relate to a steam valve device.

  Power generation equipment equipped with a turbo machine such as a steam turbine has an abnormal increase in the rotational speed of the impeller, an expansion difference between the impeller and the container, an increase in vibration, a high temperature in the low-pressure exhaust chamber, a decrease in bearing hydraulic pressure, a boiler and a generator A variety of security devices are provided for the purpose of detecting various abnormal phenomena such as malfunctions and preventing accidents in advance or minimizing damage caused by accidents.

  One of the safety devices detects, for example, an abnormality of the steam turbine such that the rotation speed of the steam turbine rises above a set rotation speed by applying an appropriate measuring instrument, and based on this detection result, A steam valve device is known which closes a main steam stop valve connected to a steam inlet of a steam turbine so as to block steam inflow.

  FIG. 5 is a system diagram showing a conventional steam valve device.

  As shown in FIG. 5, the conventional steam valve device 101 includes a steam valve 103 as a main steam stop valve and a hydraulic drive device 105 that opens and closes the steam valve 103.

  The hydraulic drive device 105 closes the dump valve 112, the hydraulic cylinder 106 that opens and closes the steam valve 103, the pilot solenoid valve 111 that drives the hydraulic cylinder 106, the dump valve 112 that can discard the hydraulic oil in the hydraulic cylinder 106. Thus, a quick-acting electromagnetic valve 113 that maintains the hydraulic pressure in the hydraulic cylinder 106 and a shut-off valve 127 that can shut off the flow of hydraulic oil toward the pilot solenoid valve 111 are provided.

  When opening the steam valve 103, the conventional steam valve device 101 first opens the quick-acting electromagnetic valve 113 and supplies hydraulic oil to the dump valve 112 and the shut-off valve 127. The dump valve 112 to which the hydraulic oil is supplied closes to a state where the hydraulic pressure in the hydraulic cylinder 106 can be maintained. On the other hand, the shut-off valve 127 supplied with hydraulic oil is opened to allow the flow of hydraulic oil toward the pilot solenoid valve 111. Next, the conventional steam valve device 101 opens the pilot electromagnetic valve 111 to drive the hydraulic cylinder 106, and consequently opens the steam valve 103, and distributes the steam.

  On the other hand, when the steam valve 103 is closed in the event of a malfunction of the steam turbine, the conventional steam valve device 101 closes the rapid operation electromagnetic valve 113 and shuts off the hydraulic oil in the dump valve 112 and the shutoff valve 127. The dump valve 112 from which the hydraulic oil is blocked is opened to discard the hydraulic oil in the hydraulic cylinder 106. On the other hand, the shutoff valve 127 from which the working oil is shut off is closed to a state in which the flow of the working oil toward the pilot solenoid valve 111 is shut off. Then, the conventional steam valve device 101 closes the steam valve 103 and shuts off the steam.

  In addition to the main steam stop valve, the power generation facility includes steam valve devices such as a steam control valve, an intermediate steam stop valve, and an intercept valve, and is appropriately multiplexed for each function.

JP 2006-233797 A

  By the way, as a measure for improving the facility operation rate of the light water reactor power plant, it is required to operate the light water reactor power plant continuously without stopping for a long time.

  However, the light water reactor power plant is more likely to fail as the continuous operation period becomes longer. Therefore, it is desirable that the light water reactor power plant is a fault-tolerant facility capable of repairing and restoring a failed device while continuing operation even if any device fails. Maintenance such as repair, restoration, and inspection performed during operation of a light water reactor power plant is called online maintenance.

  In the case of a conventional steam valve device, there is a risk of malfunctioning or malfunctioning of the hydraulic pilot device, especially an electromagnetic pilot valve such as a pilot solenoid valve or a quick-acting solenoid valve, which may hinder the opening and closing of the steam valve. . In this case, the light water reactor power plant needs to shut off the supply of hydraulic oil of the steam valve device in order to repair and restore the failed steam valve device.

  However, although light water reactor power plants are appropriately multiplexed for each function such as a main steam stop valve and a steam control valve, generally, each steam valve device shares a hydraulic power source device. When repairing or restoring the equipment, it is necessary to stop the supply of hydraulic oil to all steam valve devices that have similar functions, such as the entire system of the main steam stop valve or the entire system of the steam control valve, and the hydraulic power source device is stopped. Therefore, it is necessary to close all the steam valve devices having the same function and to stop the steam turbine, and there is a problem that the operation of the entire light water reactor power plant cannot be continued.

  Accordingly, an object of the present invention is to provide a steam valve device capable of performing on-line maintenance of power generation equipment during maintenance work of a hydraulic drive device.

In order to solve the above-described problems, a steam valve device according to the present invention includes a steam valve having a valve body that permits, blocks, adjusts or blocks steam flow, a hydraulic cylinder that drives the valve body, and the hydraulic cylinder. A first solenoid valve that allows, shuts, adjusts or shuts off the flow of the hydraulic oil to be driven, and a release that can be opened and closed in an open state in which the hydraulic oil in the hydraulic cylinder is discarded or in a closed state in which the hydraulic pressure in the hydraulic cylinder is maintained The stop valve is connected to a valve, a second solenoid valve that shuts off or permits a flow of hydraulic oil that closes the discharge valve, a stop valve that blocks or allows a flow of hydraulic oil toward the second solenoid valve, and comprising a waste pipe, the said check valve, to said second towards the solenoid valve the hydraulic oil pressure source apparatus, the second electromagnetic valve, and wherein the three-way valve der Rukoto to be connected to the waste pipe .

  ADVANTAGE OF THE INVENTION According to this invention, in the maintenance work of a hydraulic drive device, the steam valve apparatus which can perform on-line maintenance of power generation equipment can be proposed.

1 is a system diagram illustrating an example of power generation equipment including a steam valve device according to a first embodiment of the present invention. 1 is a system diagram showing a steam valve device according to a first embodiment of the present invention. Schematic which shows the connection structure of the pilot solenoid valve and piping in the steam valve apparatus which concerns on 1st Embodiment of this invention. The systematic diagram which shows the steam valve apparatus which concerns on 2nd Embodiment of this invention. The system diagram which shows the conventional steam valve apparatus.

  Hereinafter, embodiments of a steam valve device according to the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of a steam valve device according to the present invention will be described with reference to FIGS. 1 to 3.

  FIG. 1 is a system diagram illustrating an example of power generation equipment including a steam valve device according to a first embodiment of the present invention.

  As shown in FIG. 1, the steam turbine power generation facility 1 is, for example, a nuclear power plant, and in particular, is an improved boiling water reactor (ABWR: Advanced Boiling Water Reactor). The steam turbine power generation facility 1 includes a nuclear reactor 2, a high-pressure turbine 3, a moisture separation heater 5, a low-pressure turbine 6, a condenser 8, and a feed water pump 9.

  The nuclear reactor 2 heats the reactor water to steam by nuclear fuel fission. The nuclear reactor 2 is connected to the high-pressure turbine 3 through the main steam stop valve 11 and the steam control valve 12 in order, and sends steam to the high-pressure turbine 3.

  The high-pressure turbine 3 is a turbo machine and is rotated by steam flowing from the nuclear reactor 2. The high-pressure turbine 3 is connected to the moisture separation heater 5, and sends the steam that has finished the expansion work to the moisture separation heater 5.

  The moisture separator / heater 5 removes moisture from the steam that has rotated the high-pressure turbine 3 and heats it. The moisture separation heater 5 is connected to the low-pressure turbine 6 through the intermediate steam stop valve 13 and the intercept valve 15 in order, and removes moisture to send the heated steam to the low-pressure turbine 6.

  The low-pressure turbine 6 is a turbo machine, and has a rotating shaft directly connected to the high-pressure turbine 3 and is rotated by steam flowing from the moisture separation heater 5. The low-pressure turbine 6 is connected to the condenser 8 and sends the steam that has finished the expansion work to the condenser 8. The rotation of the high-pressure turbine 3 and the low-pressure turbine 6 generates electricity by driving a generator (not shown).

  The condenser 8 condenses the steam that has finished the expansion work in the low-pressure turbine 6 to generate condensate.

  The feed water pump 9 pumps the condensate generated by the condenser 8 to the reactor 2 as reactor water.

  The main steam stop valve 11, the steam control valve 12, the intermediate steam stop valve 13 and the intercept valve 15 are steam valve devices.

  Further, the steam turbine power generation facility 1 includes an abnormal increase in the rotational speed of the turbines 3 and 6, a difference in elongation between the turbines 3 and 6 and a casing (not shown), an increase in vibration, a high temperature in the exhaust chamber of the low-pressure turbine 6, the turbine Various safety devices (not shown) for the purpose of detecting various abnormal phenomena such as a decrease in bearing hydraulic pressure of 3 and 6 and failure of the generator and preventing accidents or minimizing damage due to accidents Is provided. When the safety device detects an abnormality in the turbines 3 and 6 or the generator, it outputs an abnormality detection signal.

  The steam turbine power generation facility 1 includes a light water reactor power plant that includes a moisture separator (not shown) instead of the moisture separator heater 5, and a single-shaft type or multi-shaft that includes a boiler (not shown) instead of the nuclear reactor 2. It may be a type combined cycle power plant.

  FIG. 2 is a system diagram showing the steam valve device according to the first embodiment of the present invention.

  As shown in FIG. 2, the steam valve device 21 includes a steam valve 23 having a valve body 22 that permits or blocks the flow of steam, and a hydraulic drive device 25 that opens and closes the steam valve 23.

  The steam valve 23 is a part of a flow path through which steam flows, and is connected to the inlets of the high-pressure turbine 3 and the low-pressure turbine 6. The steam valve 23 may be a so-called ON / OFF valve that selectively opens and closes the valve body 22 to allow or block the flow of steam, and the valve opening of the valve body 22 is performed continuously or stepwise. It may be a so-called flow control valve that adjusts or blocks the flow of steam. When the steam valve 23 is applied to a flow rate adjusting valve, a sub valve (not shown) that starts the flow of steam prior to the valve body 22 can be provided.

  The hydraulic drive device 25 includes a hydraulic cylinder 26 that drives the valve body 22, a differential transformer 27 that measures the opening degree of the valve body 22, and a pilot solenoid valve that permits or blocks the flow of hydraulic fluid that drives the hydraulic cylinder 26. 31, a dump valve 32 that can be opened and closed in an open state in which the hydraulic oil in the hydraulic cylinder 26 is discarded or a closed state in which the hydraulic pressure in the hydraulic cylinder 26 is maintained, and a flow of hydraulic oil that closes the dump valve 32 is blocked or permitted And a first stop valve 35 that shuts off or permits the flow of hydraulic oil toward the rapid actuation solenoid valve 33.

  The hydraulic drive unit 25 also includes a shut-off valve 37 that opens and closes by the working oil branched from the flow toward the dump valve 32 and shuts off or permits the flow of the working oil toward the pilot solenoid valve 31, and the shut-off valve 37 and the pilot solenoid valve. And a second stop valve 38 for blocking or permitting the flow of hydraulic oil toward 31.

  Further, the hydraulic drive unit 25 includes a first supply pipe 41 that guides hydraulic oil from a hydraulic source device (not shown) to the cutoff valve 37, and a first supply relay pipe 42 that guides hydraulic oil from the cutoff valve 37 to the pilot solenoid valve 31. The second supply relay pipe 43 that guides the hydraulic oil from the pilot solenoid valve 31 to the hydraulic cylinder 26, the second supply pipe 45 that guides the hydraulic oil from the hydraulic power source device to the quick action solenoid valve 33, and the quick action solenoid valve 33. A third supply relay pipe 46 that guides hydraulic oil to the dump valve 32, a fourth supply relay pipe 47 that branches from the third supply relay pipe 46 and guides the hydraulic oil to the shutoff valve 37, and a hydraulic power source device from the hydraulic drive device 25 A waste pipe 48 for returning the hydraulic oil to the waste pipe 48, a first waste relay pipe 49 for returning the hydraulic oil from the hydraulic cylinder 26 to the waste pipe 48, a second waste relay pipe 51 for returning the hydraulic oil from the dump valve 32 to the waste pipe 48, From one drain of shut-off valve 37 A third waste relay pipe 52 for returning the hydraulic oil to the waste pipe 48; a fourth waste relay pipe 53 for returning the hydraulic oil to the waste pipe 48 from the other of the drains of the pilot solenoid valve 31, the quick action solenoid valve 33 and the shutoff valve 37; .

  The pilot solenoid valve 31 shown in FIG. 2 permits the flow of hydraulic oil that drives the hydraulic cylinder 26, the rapid actuation solenoid valve 33 permits the flow of hydraulic oil that closes the dump valve 32, and the shut-off valve 37. Fig. 2 illustrates a state in which the flow of hydraulic oil toward the pilot solenoid valve 31 is permitted. On the other hand, the first stop valve 35 shows a state in which the flow of hydraulic oil toward the rapid operation electromagnetic valve 33 is cut off, and the second stop valve 38 shows a state in which the flow of hydraulic oil toward the cutoff valve 37 and the pilot electromagnetic valve 31 is cut off. Is.

  The hydraulic cylinder 26 includes a hydraulic piston 55 that is directly connected to the valve body 22 and a spring 56 that drives the hydraulic piston 55 in a direction to close the steam valve 23 when the hydraulic pressure from the hydraulic oil is lost. The hydraulic piston 55 partitions the inside of the hydraulic cylinder 26 into a valve closing side chamber 26a and a valve opening side chamber 26b. The hydraulic piston 55 is connected to the differential transformer 27.

  The differential transformer 27 measures the displacement of the hydraulic piston 55 and sets the opening of the steam valve 23. In the case of the steam valve device 21 serving as the steam control valve 12 shown in FIG. 1, the differential transformer 27 may be multiplexed to increase the measurement reliability.

  The pilot solenoid valve 31 is a solenoid valve as a first solenoid valve. The pilot solenoid valve 31 allows or shuts off the flow of hydraulic oil from the hydraulic power source device to the hydraulic piston 55 and drives the hydraulic cylinder 26. The pilot solenoid valve 31 includes a spring 31b that drives the valve body 31a in a direction that permits the flow of hydraulic oil from the hydraulic power source device to the hydraulic piston 55. Further, when the coil (not shown) is excited, the pilot solenoid valve 31 interrupts and discards the flow of hydraulic oil from the hydraulic power source device to the hydraulic piston 55 and discards the hydraulic oil on the hydraulic piston 55 side.

  The pilot solenoid valve 31 may be a so-called ON / OFF valve that opens or closes the valve body 31a to permit or block the flow of hydraulic oil, and the valve opening degree of the valve body 31a is continuously or stepwise. It may be a so-called servo valve having a flow rate adjusting function so as to adjust or block the flow of hydraulic oil. When a servo valve is applied to the pilot solenoid valve 31, the hydraulic cylinder 26 can open and close the valve body 22 at an appropriate opening degree, and the steam valve 23 functions as the steam control valve 12 shown in FIG.

  The dump valve 32 is a discharge valve, and stops the flow of hydraulic oil from the hydraulic power source device through the pilot electromagnetic valve 31 to the hydraulic piston 55 or discards it outside the hydraulic piston 55. The dump valve 32 closes the valve body 32a by the pressure of the hydraulic oil flowing from the hydraulic power source device through the rapid operation electromagnetic valve 33, and the hydraulic fluid flows from the hydraulic power source device to the hydraulic piston 55 through the pilot electromagnetic valve 31. Stop within 55. On the other hand, the dump valve 32 opens the valve body 32a when the pressure of the hydraulic oil flowing from the hydraulic power source device through the rapid operation electromagnetic valve 33 is lost, and the hydraulic oil reaching the hydraulic piston 55 from the hydraulic power source device through the pilot electromagnetic valve 31 is opened. The flow is discarded outside the hydraulic piston 55.

  The quick action solenoid valve 33 is a solenoid valve as a second solenoid valve. The quick action solenoid valve 33 opens or closes the dump valve 32 and the shutoff valve 37 by permitting or shutting off the flow of hydraulic oil from the hydraulic power source device to the dump valve 32 and the shutoff valve 37. The quick-acting electromagnetic valve 33 includes a spring 33b that drives the valve body 33a in a direction that permits the flow of hydraulic oil from the hydraulic source device to the dump valve 32. Further, when the coil (not shown) is energized, the quick action solenoid valve 33 cuts off and discards the flow of hydraulic oil from the hydraulic power source device to the dump valve 32 and discards the hydraulic oil on the dump valve 32 side.

  When the steam is sent to the turbines 3 and 6, the quick action solenoid valve 33 permits the flow of hydraulic oil to the dump valve 32 and the shutoff valve 37, closes the dump valve 32, and opens the shutoff valve 37. The opening / closing control of the steam valve 23 is permitted. On the other hand, upon receiving an abnormality detection signal as a coil excitation signal from the safety device, the quick-acting solenoid valve 33 shuts off the flow of hydraulic oil reaching the dump valve 32 and the shut-off valve 37 and opens the dump valve 32 to open the shut-off valve 37. Is closed and the steam valve 23 is forcibly closed.

  Note that the electromagnetic valve in the present embodiment includes an electromagnetic pilot valve.

  The shut-off valve 37 is a hydraulic pilot valve. The shut-off valve 37 opens the valve element 37a by the pressure of the hydraulic oil flowing from the hydraulic power source device through the rapid operation electromagnetic valve 33, and permits the flow of the hydraulic fluid from the hydraulic power source device toward the pilot electromagnetic valve 31. On the other hand, the shut-off valve 37 opens the valve body 37a when the pressure of the working oil flowing from the hydraulic power source device via the rapid operation electromagnetic valve 33 is lost, and shuts off the flow of the working oil from the hydraulic power source device toward the pilot solenoid valve 31 and discards it. To do.

  The first stop valve 35 is interposed between the second supply pipe 45 and the quick-acting electromagnetic valve 33, and the second stop valve 38 is interposed between the first supply pipe 41 and the pilot electromagnetic valve 31.

  FIG. 3 is a schematic view showing a connection structure between a pilot solenoid valve and piping in the steam valve device according to the first embodiment of the present invention.

  As shown in FIG. 3, a so-called sub-plate mounting type solenoid valve having all of the oil supply port and the waste oil port on one side surface can be applied to the quick action solenoid valve 33. In this case, the hydraulic drive unit 25 includes a plurality of second supply pipes 45, third supply relay pipes 46, third waste relay pipes 52, and fourth waste relay pipes 53 that are connected to the quick-acting solenoid valve 33. And an adapter block 59 that is mechanically sandwiched between the manifold block 58 and the quick-acting solenoid valve 33 and relays the oil passage and accommodates the first stop valve 35. Can do.

  The quick-acting solenoid valve 33, which is a so-called sub-plate mounting type solenoid valve, can be mechanically and fluidly connected to both the manifold block 58 and the adapter block 59. This is because, for example, when the existing hydraulic drive device directly connects the rapid operation electromagnetic valve 33 to the manifold block 58 and does not include the first stop valve 35, the manifold block 58 and the rapid operation electromagnetic valve 33 It is possible to configure the hydraulic drive unit 25 by easily modifying it by inserting the adapter block 59 therebetween.

  The same connection configuration is applied to the shut-off valve 37 that is a hydraulic pilot valve, so that the second stop valve 38 is provided in the existing hydraulic drive device, and the hydraulic drive device 25 can be easily configured.

  When receiving the abnormality detection signal from the safety device, the steam valve device 21 having such a configuration excites the coil of the quick-acting electromagnetic valve 33 to cut off the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37, The valve 32 is opened, the shut-off valve 37 is closed, and the steam valve 23 is forcibly closed.

  By the way, the steam valve device 21 closes the steam valve 23 and repairs or replaces the non-conforming valve when the pilot solenoid valve 31, the quick-acting solenoid valve 33, and the shut-off valve 37 have malfunction or non-conformity. Need to do.

  Since the steam valve device 21 is multiplexed for each function such as the main steam stop valve 11, the steam control valve 12, the intermediate steam stop valve 13 and the intercept valve 15, even if any one system closes the steam valve 23. The operation of the steam turbine power generation facility 1 can be continued. Then, the steam valve device 21 receives the supply of hydraulic oil from the hydraulic power source device together with other multiplexed steam valve devices 21, and supplies the hydraulic oil individually by the first stop valve 35 and the second stop valve 38. The pilot solenoid valve 31, the quick-acting solenoid valve 33, and the shut-off valve 37 can be repaired or replaced while the operation of the hydraulic power source device is continued, and thus the operation of the turbines 3 and 6 is continued. This is different from the conventional steam valve device. If the hydraulic oil is shut off by the first stop valve 35 and the second stop valve 38, the steam valve device 21 stops the steam turbine power generation equipment 1 without stopping the supply of the hydraulic oil to the other steam valve devices 21. It is possible to repair or replace the pilot solenoid valve 31, the quick-acting solenoid valve 33, and the shut-off valve 37 in which the malfunction or non-conformity of the characteristic failure has occurred.

  Specifically, when a nonconformity occurs in the pilot solenoid valve 31, the steam valve device 21 excites the coil of the quick action solenoid valve 33 to shut off the flow of hydraulic oil to the dump valve 32 and the shutoff valve 37, The dump valve 32 is opened and the shutoff valve 37 is closed. Then, the dump valve 32 discards the hydraulic oil in the hydraulic cylinder 26 to the second discard relay pipe 51. The hydraulic cylinder 26 that has lost its hydraulic pressure closes the steam valve 23, and the hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device. On the other hand, the shutoff valve 37 discards the flow of hydraulic oil toward the pilot solenoid valve 31 to the fourth discard relay pipe 53. The hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device, and the pilot solenoid valve 31 from which the supply of hydraulic oil has been cut off can be removed independently. In this state, the steam valve device 21 can repair and replace the pilot solenoid valve 31. After the repair and replacement of the pilot solenoid valve 31 are completed, the steam valve device 21 demagnetizes the coil of the quick action solenoid valve 33 and permits the flow of hydraulic oil to the dump valve 32 and the shutoff valve 37. Is closed and the shut-off valve 37 is opened to allow normal operation.

  Next, when a nonconformity occurs in the rapid operation solenoid valve 33, the steam valve device 21 excites the coil of the pilot solenoid valve 31 to cut off the flow of hydraulic oil to the hydraulic cylinder 26 and closes the steam valve 23. In addition, the steam valve device 21 closes the first stop valve 35 and blocks the flow of hydraulic oil toward the rapid operation electromagnetic valve 33. The quick-acting solenoid valve 33 from which the supply of hydraulic oil is cut off can be removed alone. In this state, the steam valve device 21 can repair and replace the quick-acting electromagnetic valve 33. The steam valve device 21 opens the first stop valve 35 after the repair and replacement of the quick-acting electromagnetic valve 33 is finished, permits the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37, and closes the dump valve 32. The shut-off valve 37 is opened to allow normal operation.

  Next, when a mismatch occurs in the pilot solenoid valve 31 and the quick action solenoid valve 33, the steam valve device 21 closes the first stop valve 35 and shuts off the flow of hydraulic oil toward the quick action solenoid valve 33. The stop valve 38 is closed, the flow of hydraulic oil toward the pilot solenoid valve 31 is shut off, and the steam valve 23 is closed. The pilot solenoid valve 31 and the quick action solenoid valve 33 from which the supply of hydraulic oil is cut off can be removed independently. In this state, the steam valve device 21 can repair and replace the pilot solenoid valve 31 and the quick action solenoid valve 33. The steam valve device 21 permits the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37 by opening the first stop valve 35 after the repair and replacement of the pilot solenoid valve 31 and the quick action solenoid valve 33 are completed. While the dump valve 32 is closed and the shut-off valve 37 is opened, the second stop valve 38 is opened and the flow of hydraulic oil toward the pilot solenoid valve 31 is permitted to allow normal operation.

  Next, when the non-conformity occurs in the shut-off valve 37, the steam valve device 21 excites the coil of the quick-acting electromagnetic valve 33 to shut off the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37. open. Further, the steam valve device 21 closes the steam valve 23 by closing the second stop valve 38 and blocking the flow of hydraulic oil toward the pilot solenoid valve 31. Then, the dump valve 32 discards the hydraulic oil in the hydraulic cylinder 26 to the second discard relay pipe 51. The hydraulic cylinder 26 that has lost its hydraulic pressure closes the steam valve 23, and the hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device. The shut-off valve 37 from which the supply of hydraulic oil is cut off can be removed alone. In this state, the steam valve device 21 can repair and replace the shutoff valve 37. After the repair and replacement of the shut-off valve 37 are completed, the steam valve device 21 demagnetizes the coil of the quick-acting electromagnetic valve 33 and permits the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37. While the closing shut-off valve 37 is opened, the second stop valve 38 is opened and the flow of hydraulic oil toward the pilot solenoid valve 31 is permitted to allow normal operation.

  The steam valve device 21 according to the present embodiment can shut off the hydraulic fluid flowing from the hydraulic power source device even if a failure occurs in the pilot electromagnetic valve 31, the quick action electromagnetic valve 33, and the cutoff valve 37. On-line maintenance of the pilot solenoid valve 31, the quick action solenoid valve 33, and the shut-off valve 37 is possible while continuing the operation of the steam turbine and the steam turbine, and the steam turbine power generation facility 1 is continuously operated. The plant improves the equipment operation rate and enables continuous operation without stopping for a long time.

[Second Embodiment]
A second embodiment of the steam valve device according to the present invention will be described with reference to FIG.

  FIG. 4 is a system diagram showing a steam valve device according to a second embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIG. 4, the steam valve device 21 </ b> A includes a first stop valve 61 that blocks or permits the flow of hydraulic oil toward the rapid actuation electromagnetic valve 33, and a flow of hydraulic oil toward the cutoff valve 37 and the pilot solenoid valve 31. And a check valve 63 that prevents the hydraulic oil in the waste pipe 48 from flowing back to the hydraulic cylinder 26, the dump valve 32, and the quick action solenoid valve 33.

  The first stop valve 61 shown in FIG. 4 is in a state where the flow of hydraulic oil toward the rapid actuation electromagnetic valve 33 is cut off, and the second stop valve 62 is cut off from the flow of hydraulic oil toward the cutoff valve 37 and the pilot electromagnetic valve 31. It shows the state.

  The first stop valve 61 is a three-way switching valve, and has at least three connection ports connected to any one of the hydraulic power source device, the quick-acting electromagnetic valve 33 and the waste pipe 48. The first stop valve 61 permits the flow of hydraulic oil toward the rapid actuation solenoid valve 33 and switches the oil path so as to block the flow of hydraulic oil toward the rapid actuation solenoid valve 33 and discard it in the waste pipe 48. Can do.

  The second stop valve 62 is a three-way switching valve and has at least three connection ports that are connected to any one of the hydraulic power source device, the shut-off valve 37, and the waste pipe 48. The second stop valve 62 permits the flow of hydraulic oil toward the shutoff valve 37 and the pilot solenoid valve 31, and switches the oil path so as to shut off the flow of hydraulic oil toward the shutoff valve 37 and discard it in the waste pipe 48. be able to.

  The first stop valve 61 and the second stop valve 62 may be a combination of at least two two-way switching valves.

  The steam valve device 21A receives supply of hydraulic oil from the hydraulic power source device together with the other steam valve devices 21A multiplexed in the same manner as the steam valve device 21. The first stop valve 61 and the second stop valve 62 individually It is possible to shut off the supply of hydraulic oil to the pilot solenoid valve 31, the quick-acting solenoid valve 33 and the shut-off valve 37 while continuing the operation of the hydraulic power source device and thus continuing the operation of the turbines 3 and 6. It differs from the conventional steam valve device in that it can be repaired and replaced. When the first stop valve 61 and the second stop valve 62 block the hydraulic oil, the steam valve device 21A stops the steam turbine power generation equipment 1 without stopping the supply of the hydraulic oil to the other steam valve device 21A. It is possible to repair or replace the pilot solenoid valve 31, the quick-acting solenoid valve 33, and the shut-off valve 37 in which the malfunction or non-conformity of the characteristic failure has occurred.

  Specifically, when the pilot solenoid valve 31 is incompatible, the steam valve device 21A excites the coil of the rapid operation solenoid valve 33 to shut off the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37. The dump valve 32 is opened and the shutoff valve 37 is closed. Then, the dump valve 32 discards the hydraulic oil in the hydraulic cylinder 26 to the second discard relay pipe 51. The hydraulic cylinder 26 that has lost its hydraulic pressure closes the steam valve 23, and the hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device. On the other hand, the shut-off valve 37 discards the flow of hydraulic oil toward the pilot solenoid valve 31 to the fourth waste relay pipe 53 connected to the waste pipe 48. The hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device, and the pilot solenoid valve 31 from which the supply of hydraulic oil has been cut off can be removed independently. In this state, the steam valve device 21A can repair or replace the pilot solenoid valve 31. After the repair and replacement of the pilot solenoid valve 31 are completed, the steam valve device 21A demagnetizes the coil of the rapid action solenoid valve 33 and permits the flow of hydraulic oil to the dump valve 32 and the shutoff valve 37. Is closed and the shut-off valve 37 is opened to allow normal operation.

  Next, when a nonconformity occurs in the rapid operation electromagnetic valve 33, the steam valve device 21 </ b> A closes the steam valve 23 by exciting the coil of the pilot electromagnetic valve 31 to cut off the flow of hydraulic oil to the hydraulic cylinder 26. Further, the steam valve device 21 </ b> A switches the oil passage of the first stop valve 61 to block the flow of the hydraulic oil toward the rapid operation electromagnetic valve 33 and discard it in the waste pipe 48. The quick-acting solenoid valve 33 from which the supply of hydraulic oil is cut off can be removed alone. In this state, the steam valve device 21 </ b> A can repair and replace the quick-acting electromagnetic valve 33. The steam valve device 21A permits the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37 by switching the oil path of the first stop valve 61 after the quick-acting electromagnetic valve 33 has been repaired and replaced. 32 is closed and the shut-off valve 37 is opened to allow normal operation.

  Next, the steam valve device 21A switches the oil passage of the first stop valve 61 and shuts off the flow of the hydraulic oil toward the rapid operation solenoid valve 33 when the pilot solenoid valve 31 and the rapid operation solenoid valve 33 are incompatible. The waste pipe 48 is discarded, the oil passage of the second stop valve 62 is switched, the flow of hydraulic oil toward the pilot solenoid valve 31 is cut off, discarded to the waste pipe 48, and the steam valve 23 is closed. The pilot solenoid valve 31 and the quick action solenoid valve 33 from which the supply of hydraulic oil is cut off can be removed independently. In this state, the steam valve device 21 </ b> A can repair and replace the pilot solenoid valve 31 and the quick action solenoid valve 33. After the repair and replacement of the pilot solenoid valve 31 and the quick action solenoid valve 33 are finished, the steam valve device 21A switches the oil passage of the first stop valve 61 to flow the hydraulic oil to the dump valve 32 and the shutoff valve 37. Permit, close the dump valve 32 and open the shut-off valve 37, and switch the oil path of the second stop valve 62 to permit the flow of hydraulic oil toward the pilot solenoid valve 31, thereby enabling normal operation.

  Next, when a non-conformity occurs in the shut-off valve 37, the steam valve device 21A excites the coil of the quick-acting electromagnetic valve 33 to shut off the flow of hydraulic oil to the dump valve 32 and the shut-off valve 37, and open. The steam valve device 21 </ b> A switches the oil path of the second stop valve 62 to block the flow of hydraulic oil toward the pilot electromagnetic valve 31, discards it in the waste pipe 48, and closes the steam valve 23. Then, the dump valve 32 discards the hydraulic oil in the hydraulic cylinder 26 to the second discard relay pipe 51. The hydraulic cylinder 26 that has lost its hydraulic pressure closes the steam valve 23, and the hydraulic oil that has flowed out to the waste pipe 48 returns to the hydraulic power source device. The shut-off valve 37 from which the supply of hydraulic oil is cut off can be removed alone. In this state, the steam valve device 21A can repair and replace the shutoff valve 37. After the repair and replacement of the shut-off valve 37 are completed, the steam valve device 21A demagnetizes the coil of the quick-acting electromagnetic valve 33 and permits the flow of hydraulic oil to reach the dump valve 32 and the shut-off valve 37. While the closing shut-off valve 37 is opened, the oil passage of the second stop valve 62 is switched to allow the flow of hydraulic oil toward the pilot solenoid valve 31 to enable normal operation.

  The steam valve device 21A according to the present embodiment can shut off the hydraulic oil flowing from the hydraulic power source device even if a failure occurs in the pilot electromagnetic valve 31, the quick action electromagnetic valve 33, and the cutoff valve 37. On-line maintenance of the pilot solenoid valve 31, the quick action solenoid valve 33, and the shut-off valve 37 is possible while continuing the operation of the steam turbine and the steam turbine, and the steam turbine power generation facility 1 is continuously operated. The plant improves the equipment operation rate and enables continuous operation without stopping for a long time.

  According to the steam valve devices 21 and 21A according to the present embodiment, on-line maintenance of the steam turbine power generation facility 1 becomes possible during maintenance work of the hydraulic drive device.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Steam turbine power generation equipment 2 Reactor 3 High pressure turbine 5 Moisture separation heater 6 Low pressure turbine 8 Condenser 9 Water supply pump 11 Main steam stop valve 12 Steam control valve 13 Intermediate steam stop valve 15 Intercept valve 21, 21A Steam valve apparatus 22 Valve body 23 Steam valve 25 Hydraulic drive device 26 Hydraulic cylinder 26a Valve closing side chamber 26b Valve opening side chamber 27 Differential transformer 31 Pilot solenoid valve 31a Valve body 31b Spring 32 Dump valve 32a Valve body 33 Rapidly operating solenoid valve 33a Valve body 33b Spring 35 First stop valve 37 Shut-off valve 37a Valve body 38 Second stop valve 41 First supply pipe 42 First supply relay pipe 43 Second supply relay pipe 45 Second supply pipe 46 Third supply relay pipe 47 Fourth supply relay pipe 48 waste pipe 49 first waste relay pipe 51 second waste relay pipe 52 third waste relay pipe 53 fourth waste relay pipe 55 hydraulic piston 5 6 Spring 57 Oil path 58 Manifold block 59 Adapter block 61 First stop valve 62 Second stop valve 63 Check valve 101 Steam valve device 103 Steam valve 105 Hydraulic drive device 106 Hydraulic cylinder 111 Pilot solenoid valve 112 Dump valve 113 Rapidly actuated electromagnetic Valve 127 Shut-off valve

Claims (5)

A steam valve having a valve body for permitting or shutting off, or adjusting or shutting off the flow of steam;
A hydraulic cylinder for driving the valve body;
A first solenoid valve that permits or shuts off or adjusts or shuts off the flow of hydraulic oil that drives the hydraulic cylinder;
A release valve that can be opened and closed in an open state in which the hydraulic oil in the hydraulic cylinder is discarded or in a closed state in which the hydraulic pressure in the hydraulic cylinder is retained;
A second solenoid valve that shuts off or permits the flow of hydraulic oil to close the discharge valve;
A stop valve that blocks or permits the flow of hydraulic oil toward the second solenoid valve;
A waste pipe to which the stop valve is connected,
The stop valve is a hydraulic pressure source device for hydraulic oil directed to the second electromagnetic valve, the second electromagnetic valve, and a three-way switching valve that is connected to the waste pipe and switches a flow direction of the hydraulic oil. Steam valve device to do. A hydraulic pilot valve that opens and closes by hydraulic oil branched from the flow toward the discharge valve, and blocks or permits the flow of hydraulic oil toward the first electromagnetic valve;
The steam valve device according to claim 1, further comprising: a second stop valve that blocks or permits the flow of hydraulic oil toward the hydraulic pilot valve and the first electromagnetic valve. The second stop valve is connected to the hydraulic pilot valve and the hydraulic oil source device for the hydraulic fluid toward the first electromagnetic valve, the hydraulic pilot valve, and the three-way switching valve for switching the direction of the hydraulic oil flow by connecting to the waste pipe The steam valve device according to claim 2, wherein A manifold block having an oil passage connected to the second solenoid valve; and an adapter block that is mechanically sandwiched between the second solenoid valve and the manifold block and accommodates the stop valve. The steam valve device according to any one of claims 1 to 3. It comprises a luma two hold blocks having a fluid passage connected to the pilot valve, and an adapter block for accommodating the second stop valve with sandwiched mechanical between the manifold block and the pilot valve The steam valve device according to claim 2.

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