JP2009293838A - Cavitation removing system and water supply device of power generation plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cavitation removing system and a water supply device for a power generation plant, removing generated cavitation with a simple constitution. <P>SOLUTION: This cavitation removing system comprises: a water storage tank 31 storing water; a water supply pump 33 disposed in a lower part of the water storage tank 31 and operated with hydraulic head pressure; and a steam-water separator 32 disposed near the water supply pump 33 through a condensate pipe 26 connecting the water storage tank 31 and the water supply pump 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cavitation removing system for removing cavitation generated by pressure fluctuation in a water supply flow path and a water supply device for a power plant.

  Conventionally, a water storage tank is disposed on the upstream side of a pump that pumps up and discharges water, through a water supply channel. At this time, the water storage tank is provided above the pump, and the occurrence of cavitation is suppressed by applying a predetermined head pressure (suction head) to the pump. In other words, cavitation tends to occur when the suction head (NPSH: Net Positive Suction Head) decreases. For this reason, it is necessary that the NPSH (effective NPSH) determined in the operation condition of the pump exceeds the minimum NPSH (required NPSH) that can suppress the occurrence of cavitation.

  However, when the pressure in the water storage tank decreases, the pressure in the water supply channel decreases, and the speed of the water that flows in the water supply channel changes. That is, in the water supply flow path, a place where the irrigation water flows fast and a place where the water flows slowly occur, and NPSH partially falls below the required NPSH. Thereby, the pressure in each part in a water supply flow path will reduce, and there exists a possibility that cavitation may generate | occur | produce, when water will be reduced-pressure boiled in the decompressed part.

  Therefore, conventionally, a recirculation provided with a water supply flow rate drop detector that detects a drop in the feed water flow rate and a plurality of recirculation pump control devices that respectively control the recirculation pumps based on the detection results of the water supply flow rate drop detector A protection device for a pump is known (for example, see Patent Document 1). According to this recirculation pump protection device, when a decrease in the feed water flow rate is detected by the feed water flow rate drop detector, the plurality of recirculation pump control devices sequentially trip (stop) or decelerate each recirculation pump. Yes. This prevents the occurrence of cavitation in the recirculation pump.

Japanese Patent No. 2815591

  However, according to the conventional recirculation pump protection device, the recirculation pump must be stopped or decelerated, so that the flow rate of the water discharged from the recirculation pump decreases. In addition, a plurality of recirculation pump control devices for controlling the recirculation pump must be provided, which complicates the control system and increases the device cost.

  Then, this invention makes it a subject to provide the water supply apparatus of the cavitation removal system and power plant which can remove the generated cavitation with a simple configuration.

  The cavitation removal system of the present invention includes a water storage tank that can store water, a pump that is provided below the water storage tank and that can be operated while water head pressure is applied, and a water supply passage that connects the water storage tank and the pump. And a steam separator provided in the vicinity of the pump.

  In this case, the length of the water supply channel between the steam separator and the pump may be configured to be shorter than the length of the water supply channel between the water storage tank and the steam separator. ,preferable.

  In this case, it is preferable to further include a vent pipe for connecting the steam separator and the water storage tank.

  In this case, it is preferable to further include a recirculation pipe that connects the vent pipe and the steam separator.

  Further, in this case, it is preferable that the recirculation pipe has a heat dissipation property.

  In these cases, it is preferable to further include an auxiliary air / water separator provided at a connection portion between the vent pipe and the recirculation pipe.

  In these cases, it is preferable that the steam / water separator includes a foreign matter removing means for removing foreign matter mixed in the water supply flow path.

  The water supply device for a power plant according to the present invention is provided with a condenser for cooling and liquefying the vaporized water, a water storage tank capable of storing the water liquefied by the condenser, and a water tank under the water storage tank. A pump that can be operated while being added, and an air-water separator that is provided in the vicinity of the pump and that is provided in a water supply flow path that connects the water storage tank and the pump.

  According to the cavitation removing system of the first aspect, the water containing cavitation flowing into the pump can be separated into the gas-phase water and the liquid-phase water by the steam separator. That is, the steam separator can remove cavitation in the service water and discharge the service water from which the cavitation has been removed to the pump. For this reason, even if cavitation occurs in the water supply channel, the cavitation can be removed by the steam separator. Thereby, since cavitation does not flow into the pump, even if cavitation occurs in the water supply flow path, it is possible to operate without stopping or decelerating the operation of the pump.

  According to the cavitation removal system of claim 2, the water supply channel between the water storage tank and the steam separator can be lengthened, and the water feed channel between the steam separator and the pump can be shortened. it can. For this reason, it becomes possible to remove most of the cavitation generated in the water supply flow path.

  According to the cavitation removing system of the third aspect, the gas separated by the steam separator can be returned to the water storage tank via the vent pipe. For this reason, since the inside of a water storage tank can be pressurized with the returned gas, NPSH in a water supply flow path can be raised. Thereby, generation | occurrence | production of the cavitation in a water supply flow path can be suppressed by providing a vent pipe.

  According to the cavitation removal system of the fourth aspect, the water that has become liquid in the vent pipe can be returned to the steam separator through the recirculation pipe. For this reason, inflow of the irrigation water used as the liquid can be suppressed in the vent pipe in the downstream of the connection part with a recirculation pipe | tube. Thereby, since a vent pipe can be functioned favorably, generation | occurrence | production of the cavitation in a water supply flow path can be suppressed.

  According to the cavitation removing system of the fifth aspect, in the recirculation pipe, it is possible to quickly return the vaporized water to the liquid by improving the heat dissipation.

  According to the cavitation removal system of the sixth aspect, the auxiliary water / water separator can efficiently separate the service water that has become two phases (gas phase and liquid phase) in the vent pipe.

  According to the cavitation removal system of the seventh aspect, since foreign matters mixed in the water supply flow path can be removed, the occurrence of cavitation centered on the foreign matters can be suppressed on the downstream side of the steam-water separator. .

  According to the water supply device of the power plant of claim 8, the water containing cavitation flowing into the pump can be separated into the gas phase water and the liquid phase water by the steam separator. That is, the steam separator can remove cavitation in the service water and discharge the service water from which the cavitation has been removed to the pump. For this reason, even if cavitation occurs in the water supply channel, the cavitation can be removed by the steam separator. As a result, cavitation does not flow into the pump, so even if cavitation occurs in the water supply flow path, it is possible to operate without stopping or decelerating the operation of the pump, and supply water well. Can do.

  Hereinafter, a nuclear power plant to which a cavitation removal system according to the present invention is applied will be described with reference to the accompanying drawings. The present invention is not limited to the following examples.

  In the nuclear power plant according to the first embodiment, a pressurized water reactor (PWR) is used as a nuclear reactor. A pressurized water nuclear power plant heats light water as a primary coolant in a nuclear reactor, and then sends the light water at a high temperature to a steam generator by a pump. Then, the nuclear power plant evaporates the secondary coolant by exchanging heat with the secondary coolant in the steam generator, and sends the evaporated secondary coolant (steam) to the turbine. Power is generated by driving the generator.

  Here, FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant to which the cavitation removal system according to the first embodiment is applied, and FIG. 2 is a schematic configuration diagram illustrating the cavitation removal system according to the first embodiment. . Hereinafter, the configuration of the nuclear power plant will be described with reference to FIG.

  As shown in FIG. 1, the nuclear power plant 1 includes a nuclear reactor 5 and a steam generator 7 connected to the nuclear reactor 5 through a pair of coolant pipes 6a and 6b including a cold leg 6a and a hot leg 6b. is doing. In addition, a pressurizer 8 is interposed in the hot leg 6b of the pair of coolant pipes 6a and 6b, and a coolant pump 9 is interposed in the cold leg 6a. The reactor 5, the pair of coolant pipes 6a and 6b, the steam generator 7, the pressurizer 8 and the coolant pump 9 constitute the primary cooling system 3 of the nuclear power plant 1, and these contain the reactor containment vessel. 10.

  In the above configuration, the light water as the primary coolant flows into the steam generator 7 from the nuclear reactor 5 through the hot leg 6b, and then the light water flowing out through the steam generator 7 passes through the cold leg 6a. And flows into the reactor 5. That is, light water circulates between the nuclear reactor 5 and the steam generator 7. Moreover, the light water decelerates the neutron generated by the nuclear fission reaction of the nuclear reactor 5, and is used as a coolant and a neutron moderator.

  The nuclear reactor 5 is a pressurized water reactor as described above, and the inside thereof is filled with light water. In the nuclear reactor 5, a large number of fuel assemblies 15 are accommodated, and a large number of control rods 16 for controlling the nuclear fission of the fuel assemblies 15 are provided so as to be insertable into the respective fuel assemblies 15.

  When the fuel assembly 15 is fissioned while controlling the fission reaction by the control rod 16, thermal energy is generated by the fission. The generated thermal energy heats light water, and the heated light water is sent to the steam generator 7 via the hot leg 6b. On the other hand, the light water sent from the steam generator 7 via the cold leg 6 a flows into the nuclear reactor 5 and cools the nuclear reactor 5.

  The pressurizer 8 interposed in the hot leg 6b suppresses boiling of light water by pressurizing light water that has become high temperature. Moreover, the steam generator 7 heat-exchanges the light water which became high temperature / high pressure with the secondary coolant, evaporates the secondary coolant, generates steam, and cools the light water which became high temperature / high pressure. is doing. The coolant pump 9 circulates light water in the primary cooling system 3, sends light water from the steam generator 7 to the reactor 5 through the cold leg 6 a, and generates light water from the reactor 5 through the hot leg 6 b to generate steam. It is sent to the vessel 7.

  Here, a series of operations in the primary cooling system 3 of the nuclear power plant 1 will be described. When the light water is heated by the thermal energy generated by the fission reaction in the nuclear reactor 5, the heated light water is sent to the steam generator 7 by the coolant pump 9 via the hot leg 6b. The hot light water passing through the hot leg 6b is pressurized by the pressurizer 8 to suppress boiling, and flows into the steam generator 7 in a state of high temperature and pressure. The high-temperature and high-pressure light water that has flowed into the steam generator 7 is cooled by exchanging heat with the secondary coolant, and the cooled light water is sent to the reactor 5 by the coolant pump 9 via the cold leg 6a. And the reactor 5 is cooled because the cooled light water flows into the reactor 5.

  The nuclear power plant 1 connects the turbine 22 connected to the steam generator 7 via the steam pipe 21, the condenser 23 connected to the turbine 22, and the condenser 23 and the steam generator 7. And a condensate pipe 26 (water supply flow path). The condensate pipe 26 is provided with a condensate pump 24, a deaerator 30, a water storage tank 31, a steam separator 32, and a feed water pump 33 from the upstream side thereof, and thereby the secondary cooling system 20 (water feed device). ) Is configured. The secondary coolant circulating in the secondary cooling system 20 evaporates in the steam generator 7 to become a gas (steam) and is returned from the gas to the liquid in the condenser 23. A generator 25 is connected to the turbine 22 described above.

  When steam flows from the steam generator 7 into the turbine 22 through the steam pipe 21, the turbine 22 rotates. When the turbine 22 rotates, the generator 25 connected to the turbine 22 generates power. Thereafter, the steam flowing out from the turbine 22 flows into the condenser 23. The condenser 23 has a cooling pipe 27 disposed therein, and one of the cooling pipes 27 is connected to a water intake pipe 28 for supplying cooling water (for example, seawater). A drain pipe 29 for draining the cooling water is connected to. The condenser 23 cools the steam flowing in from the turbine 22 by the cooling pipe 27, thereby returning the steam to a liquid. The secondary coolant that has become liquid is sent to the deaerator 30 via the condensate pipe 26 by the condensate pump 24. In the deaerator 30, the gas mixed in the secondary cooling water that has become liquid is removed, and the secondary cooling water after deaeration is stored in the water storage tank 31. The secondary cooling water stored in the water storage tank 31 is sent to the steam generator 7 by the feed water pump 33 via the steam separator 32. The secondary coolant sent to the steam generator 7 becomes steam again by exchanging heat with the primary coolant in the steam generator 7.

  By the way, when the pressure in the water storage tank 31 decreases, the speed of the water flowing through the condensate pipe 26 changes in the condensate pipe 26 on the downstream side of the water storage tank 31. That is, in the condensate pipe 26 between the water storage tank 31 and the water supply pump 33, the speed of the water in the condensate pipe 26 on the water storage tank 31 side is different from the speed of the water in the condensate pipe 26 on the water supply pump 33 side. Flow at speed. For this reason, pressure fluctuations occur in the condensate pipe 26. In other words, the pressure in the condensate pipe 26 is partially reduced, and there is a possibility that cavitation occurs due to the boiling of the water under reduced pressure. For this reason, in the first embodiment, a cavitation removal system S <b> 1 for removing cavitation in the condensate pipe 26 is incorporated in the nuclear power plant 1.

  Here, the cavitation removing system S1 according to the first embodiment will be described with reference to FIG. The cavitation removal system S <b> 1 includes the water storage tank 31, the air / water separator 32, and the water supply pump 33, and also includes a vent pipe 35 that connects the air / water separator 32 and the water storage tank 31.

  The water storage tank 31 stores the water deaerated by the deaerator 30, and is disposed above the water supply pump 33. For this reason, the water to which a predetermined water head pressure (suction head) is applied flows into the water supply pump 33. That is, the generation of cavitation is suppressed by increasing the suction head (NPSH: Net Positive Suction Head). Specifically, the water head difference of the water storage tank 31 with respect to the water supply pump 33 is set to exceed the minimum NPSH (required NPSH) that can suppress the occurrence of cavitation. Further, the water storage tank 31 has a water supply port 37 to which the condensate pipe 26 is connected at the bottom thereof, and a pressurization port 38 to which the vent pipe 35 is connected at the upper portion thereof.

  The water supply pump 33 sucks up the water stored in the water storage tank 31 and discharges the water toward the downstream steam generator 7. Further, the water supply pump 33 is formed with a suction port 40 for sucking in water and a discharge port 41 for discharging the water.

  The steam-water separator 32 separates the inflowing water into gas-phase water and liquid-phase water, discharges the separated gas-phase water toward the vent pipe 35, and supplies the separated liquid-phase water. Discharge toward the pump 33. At this time, the steam separator 32 is disposed in the vicinity of the suction port 40 side of the water supply pump 33. For this reason, the length of the condensate pipe 26 between the steam-water separator 32 and the feed water pump 33 is shorter than the length of the condensate pipe 26 between the water storage tank 31 and the steam-water separator 32. It is configured as follows. Further, the water separator 32 is formed with a water inlet 43 for introducing water, and a gas phase outlet 44 for discharging the separated gas water, and the separated liquid phase water. A liquid-phase discharge port 45 for discharging the water is formed. For this reason, when water containing mixed cavitation is introduced from the water introduction port 43, the air / water separator 32 discharges cavitation (gas phase water) from the gas phase discharge port 44 and cavitation from the liquid phase discharge port 45. The water from which the water has been removed (liquid phase water) is discharged.

  One end of the vent pipe 35 is connected to the gas phase outlet 44 of the steam separator 32, and the other end is connected to the pressurizing port 38 of the water storage tank 31. Therefore, the gas-phase water discharged from the gas-phase discharge port 44 passes through the vent pipe 35 and is introduced into the water storage tank 31. Thereby, since the internal pressure of the water storage tank 31 rises, the pressure in the condensate pipe 26 between the water storage tank 31 and the water supply pump 33 rises, and NPSH in the condensate pipe 26 rises. Thereby, generation | occurrence | production of the cavitation in the condensate pipe 26 can be suppressed.

  Therefore, when the pressure in the water storage tank 31 decreases, pressure fluctuations occur in the condensate pipe 26, thereby causing cavitation in the condensate pipe 26. For this reason, the water containing cavitation is introduced into the steam separator 32 through the condensate pipe 26. The steam separator 32 removes cavitation in the service water and discharges the removed service water toward the water supply pump 33. On the other hand, the steam separator 32 sends the removed cavitation (gas-phase water) into the water storage tank 31 to increase the pressure in the water storage tank 31 and suppress the occurrence of cavitation in the condensate pipe 26. . As a result, the steam separator 32 can feed the water from which cavitation has been removed to the feed water pump 33, so that the feed water pump 33 can operate without being affected by the cavitation.

  According to the above configuration, even if cavitation occurs in the condensate pipe 26, the cavitation can be removed by the steam separator 32. Thereby, since cavitation does not flow into the feed water pump 33, even if cavitation occurs in the condensate pipe 26, the operation of the feed water pump 33 is continued without stopping or decelerating the operation of the feed water pump 33. Can be done.

  In addition, the gas-phase water separated by the steam separator 32 can be returned to the water storage tank 31 via the vent pipe 35. Thereby, since the pressure in the water storage tank 31 can be raised and the pressure in the condensate pipe 26 can be raised, NPSH in the condensate pipe 26 can be raised, and generation | occurrence | production of a cavitation can be suppressed.

  Next, a cavitation removal system S2 according to the second embodiment will be described with reference to FIG. Only different parts will be described in order to avoid duplicate descriptions. FIG. 3 is a schematic configuration diagram illustrating the cavitation removal system according to the second embodiment. As shown in FIG. 3, the cavitation removal system S <b> 2 according to the second embodiment is provided with a recirculation pipe 50 that connects the vent pipe 35 and the steam separator 32.

  Specifically, a circulating water inlet 51 to which the recirculation pipe 50 is connected is formed in the steam / water separator 32, and the recirculation pipe 50 has one end connected to the vent pipe 35 and the other end. The circulating water inlet 51 of the steam separator 32 is connected. Therefore, the steam separator 32 removes cavitation contained in the service water introduced from the service water inlet 43 and the circulating water inlet 51, and discharges the removed water from the liquid phase outlet 45, while Water is discharged from the gas phase outlet 44. At this time, part of the gas-phase water discharged from the gas-phase outlet 44 becomes liquid-phase water. For this reason, in the vent pipe 35, gas-phase and liquid-phase water flows.

  Therefore, of the two-phase water flowing in the vent pipe 35, the liquid-phase water passes through the recirculation pipe 50 and is returned to the steam separator 32, while the gas-phase water is directly used as the vent pipe. It passes through 35 and is returned to the water storage tank 31.

  According to the above configuration, the liquid phase water flowing in the vent pipe 35 can be returned to the steam separator 32 via the recirculation pipe 50. Accordingly, since the gas-phase water flows in the vent pipe 35 on the downstream side of the connection portion with the recirculation pipe 50, the vent pipe 35 is allowed to function well without being clogged with liquid. Can do.

  Next, a cavitation removal system S3 according to the third embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 4 is a schematic configuration diagram illustrating the cavitation removal system according to the third embodiment. As shown in FIG. 4, the cavitation removal system S3 according to the third embodiment is a strainer having a function as a strainer (foreign matter removing means) that removes foreign matters in place of the steam-water separator 32 described in the first embodiment. An attached steam separator 60 is provided.

  That is, the steam separator 60 separates the water introduced from the water introduction port 43 into gas phase water and liquid phase water, and then discharges the gas phase water from the gas phase outlet 44. After removing the foreign substance of the liquid phase water, the liquid phase water is discharged from the liquid phase outlet 45.

  According to the above configuration, the foreign matters mixed in the condensate pipe 26 can be removed, so that the occurrence of cavitation with foreign matters as the core can be suppressed on the downstream side of the steam / water separator 60.

  Next, a cavitation removal system S4 according to the fourth embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 5 is a schematic configuration diagram illustrating a cavitation removal system according to a fourth embodiment. As shown in FIG. 5, the cavitation removal system S4 according to the fourth embodiment is a combination of the cavitation removal system S2 of the second embodiment and the cavitation removal system S3 of the third embodiment, and serves as a strainer that removes foreign matter. A steamer-equipped steam separator 60 having a function and a recirculation pipe 50 connecting the vent pipe 35 and the steam separator 60 are provided.

  That is, the steam separator 60 separates the water introduced from the water introduction port 43 and the circulating water introduction port 51 into a gas phase water and a liquid phase water, and then converts the gas phase water into a gas phase outlet. On the other hand, after removing foreign substances from the liquid phase water, the liquid phase water is discharged from the liquid phase outlet 45.

  According to the above configuration, the liquid-phase water flowing in the vent pipe 35 can be returned to the steam separator 60 via the recirculation pipe 50, and foreign matters mixed in the condensate pipe 26 are removed. can do.

  Next, a cavitation removal system S5 according to the fifth embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 6 is a schematic configuration diagram illustrating a cavitation removal system according to a fifth embodiment. As shown in FIG. 6, the cavitation removal system S5 according to the fifth embodiment includes an auxiliary air / water separator 65 at a connection portion between the vent pipe 35 and the recirculation pipe 50 of the cavitation removal system S2 according to the second embodiment. It has become.

  Specifically, the auxiliary steam separator 65 separates the two-phase water flowing in the vent pipe 35 into gas-phase water and liquid-phase water, and stores the gas-phase water through the vent pipe 35. While returning to the tank 31, liquid-phase water is returned to the steam / water separator 32 via the recirculation pipe 50.

  According to the above configuration, the auxiliary air-water separator 65 can efficiently separate the two-phase water flowing through the vent pipe 35 into gas-phase water and liquid-phase water.

  Next, a cavitation removal system S6 according to the sixth embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 7 is a schematic configuration diagram illustrating a cavitation removal system according to a sixth embodiment. As shown in FIG. 7, the cavitation removal system S6 according to the sixth embodiment includes an auxiliary air / water separator 65 at a connection portion between the vent pipe 35 and the recirculation pipe 50 of the cavitation removal system S4 of the fourth embodiment. It has become.

  Also in the above configuration, the auxiliary air-water separator 65 can efficiently separate the two-phase water flowing through the vent pipe 35 into gas-phase water and liquid-phase water.

  Next, a cavitation removal system S7 according to the seventh embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 8 is a schematic configuration diagram illustrating a cavitation removal system according to a seventh embodiment. As shown in FIG. 8, the cavitation removal system S7 according to the seventh embodiment has a configuration in which the heat dissipation of the recirculation pipe 50 of the cavitation removal system S5 of the fifth embodiment is higher than that of the condensate pipe 26 and the vent pipe 35. It has become.

  Specifically, the heat insulating material is wound around the condensate pipe 26 and the vent pipe 35, while the heat insulating material is not wound around the recirculation pipe 50. That is, the recirculation pipe 50 is configured to have higher heat dissipation than the condensate pipe 26 and the vent pipe 35. Thereby, the water which flows through the recirculation pipe 50 is cooled, so that it becomes easy to become liquid-phase water. For this reason, when cavitation is included in the water flowing through the recirculation pipe 50, the water is cooled by passing through the recirculation pipe 50, and the cavitation in the water disappears.

  According to the above configuration, since the water used in the recirculation pipe 50 can be quickly liquefied, the water introduced into the steam separator 32 via the circulating water inlet 51 does not include cavitation. Water can be used.

  Next, a cavitation removal system S8 according to the eighth embodiment will be described with reference to FIG. In this case, only different parts will be described in order to avoid redundant description. FIG. 9 is a schematic configuration diagram illustrating a cavitation removal system according to an eighth embodiment. As shown in FIG. 9, the cavitation removal system S8 according to the eighth embodiment has a configuration in which the heat dissipation performance of the recirculation pipe 50 of the cavitation removal system S6 of the sixth embodiment is higher than that of the condensate pipe 26 and the vent pipe 35. It has become.

  Even in the above configuration, since the water evaporated in the recirculation pipe 50 can be quickly liquefied, the water introduced into the steam separator 60 via the circulating water inlet 51 is used as water that does not include cavitation. It can be.

  In addition, although Example 1 thru | or 8 demonstrated cavitation removal system S1-S8 applying to the nuclear power plant 1, you may apply to a thermal power plant, for example, without limiting to this.

  As described above, the cavitation removal system and the power plant water supply apparatus according to the present invention are useful in a configuration having a water storage tank and a pump, and in particular, remove cavitation generated in a pipe connecting the water storage tank and the pump. Suitable for you.

1 is a schematic configuration diagram illustrating a nuclear power plant to which a cavitation removal system according to a first embodiment is applied. 1 is a schematic configuration diagram illustrating a cavitation removal system according to Embodiment 1. FIG. FIG. 6 is a schematic configuration diagram illustrating a cavitation removal system according to a second embodiment. FIG. 6 is a schematic configuration diagram illustrating a cavitation removal system according to a third embodiment. FIG. 10 is a schematic configuration diagram illustrating a cavitation removal system according to a fourth embodiment. FIG. 10 is a schematic configuration diagram illustrating a cavitation removal system according to a fifth embodiment. FIG. 10 is a schematic configuration diagram illustrating a cavitation removal system according to a sixth embodiment. FIG. 10 is a schematic configuration diagram illustrating a cavitation removal system according to a seventh embodiment. FIG. 10 is a schematic configuration diagram illustrating a cavitation removal system according to an eighth embodiment.

Explanation of symbols

1 Nuclear Power Plant 3 Primary Cooling System 5 Reactor 20 Secondary Cooling System 23 Condenser 24 Condensate Pump 26 Condensate Pipe 30 Deaerator 31 Reservoir Tank 32 Air Water Separator 33 Water Pump 35 Vent Pipe 37 Water Supply Port 38 Addition Pressure port 40 Suction port 41 Discharge port 43 Water inlet port 44 Gas phase outlet port 45 Liquid phase outlet port 50 Recirculation pipe 51 Circulating water inlet port 60 Air / water separator (Example 3)
65 Auxiliary air-water separator S1 Cavitation removal system (Example 1)
S2 Cavitation removal system (Example 2)
S3 Cavitation removal system (Example 3)
S4 Cavitation removal system (Example 4)
S5 Cavitation removal system (Example 5)
S6 Cavitation removal system (Example 6)
S7 Cavitation removal system (Example 7)
S8 Cavitation removal system (Example 8)

Claims (8)

A water storage tank capable of storing water,
A pump provided below the water storage tank and operable while water head pressure is applied;
A cavitation removal system comprising: an air / water separator provided in the vicinity of the pump, which is interposed in a water supply flow path connecting the water storage tank and the pump.   The length of the water supply channel between the steam separator and the pump is configured to be shorter than the length of the water supply channel between the water storage tank and the steam separator. The cavitation removal system according to claim 1.   The cavitation removal system according to claim 1, further comprising a vent pipe connecting the steam separator and the water storage tank.   The cavitation removal system according to claim 3, further comprising a recirculation pipe connecting the vent pipe and the steam separator.   The cavitation removal system according to claim 4, wherein the recirculation pipe has a heat dissipation property.   The cavitation removal system according to claim 4 or 5, further comprising an auxiliary steam separator provided at a connection portion between the vent pipe and the recirculation pipe.   The cavitation removal system according to any one of claims 1 to 6, wherein the steam separator includes a foreign matter removing means for removing foreign matter mixed in the water supply flow path. A condenser for cooling and liquefying the vaporized water,
A water storage tank capable of storing water liquefied by the condenser;
A pump provided below the water storage tank and operable while water head pressure is applied;
A water supply device for a power plant, comprising: an air / water separator provided in the vicinity of the pump, provided in a water supply flow path connecting the water storage tank and the pump.

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