JP2000292589A - Reactor power generation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove impurity of blowdown fluid from a steam generator without raising cost. SOLUTION: A reactor power generation facility is provided with a draining system 15 for draining a part of fluid in the steam generator 2 by blowdown and throwing the drained blowdown fluid in a condensate demineralizer 7 without passing through a bypass path 12, heat exchangers 17 and 18 cooling the blowdown fluid by the fluid in the condensate system 5 as a cooling medium are provided, the blowdown fluid is passed through the condensate demineralizer 7 in the state kept below the resisting temperature of the ion exchanger of the condensate demineralizer 7 to raise plant efficiency and sufficiently remove impurity by preventing degradation of ion exchange resin of the condensate demineralizer 7, and the impurity of the blowdown fluid from the steam generator 2 is removed without raising cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear power plant for driving a turbine generator by converting secondary water into steam by heat generated in a nuclear reactor.

[0002]

2. Description of the Related Art In a nuclear power plant, generally, primary system water is heated by heat generated in a nuclear reactor, and the heated high-temperature primary system water is sent to a steam generator. High-temperature water converts secondary water into steam, drives a steam turbine, and operates a generator. The steam that has completed its work in the steam turbine is cooled by seawater in a condenser, condensed, and returned to the steam generator. A condensate desalination device is provided downstream of the condenser, and impurities in the fluid condensed by the condenser are ion-exchanged and removed by the condensate desalination device. In nuclear power plants, to prevent impurities from accumulating and concentrating in the steam generator, part of the secondary system water is blown down and discharged from the steam generator, and the blown down fluid is discharged outside the system. It is either discarded in the water or collected directly in the condenser.

[0003] On the other hand, a steam generator of a nuclear power plant has a structure in which secondary water is present outside a heat exchange tube of primary water. In the secondary water circulation system, iron components etc. in the equipment piping are eluted due to erosion and corrosion, and scales at the constriction and stagnant part of the flow outside the heat exchange tube of the primary water in the steam generator In order to prevent sedimentation, ammonia or the like is introduced into the fluid of the secondary water circulation system (the outlet side of the condensate desalination unit) to increase the pH of the fluid (for example, pH 9.8 to pH 10.0). Operate as By operating the fluid at a high pH, elution of iron components such as carbon steel is suppressed.

[0004] When the secondary system water circulation system is operated at a high pH, the ammonia concentration at the inlet side of the condensate desalination unit becomes high, and a condensate desalination unit having an excessive impurity treatment capacity is required. Required. Therefore, in nuclear power plants that operate fluids at high pH, a bypass is provided to bypass the condensate desalination device. Must be kept from passing through.

[0005]

In a conventional nuclear power plant, when the secondary fluid is operated at a high pH, the fluid after the steam generator fluid is blown down and collected by the condenser is discharged. This will bypass the condensate desalination unit. For this reason,
Impurities cannot be sufficiently removed.
It is conceivable to provide an impurity removing means in the system of the blowdown fluid from the steam generator to remove impurities in the fluid after blowdown before collecting by the condenser. Must be done, which leads to a significant increase in cost. Also, since the blown-down fluid is collected in the condenser at a high temperature, there is ample room for improvement in terms of heat recovery efficiency.

[0006] The present invention has been made in view of the above circumstances, and a nuclear power plant capable of removing impurities of a blowdown fluid from a steam generator without increasing the cost and having excellent heat recovery efficiency. The purpose is to provide.

[0007]

To achieve the above object, the present invention provides a steam generator using pressurized water on the reactor side as a heat source, and a steam turbine using steam from the steam generator as a drive source. A condenser for condensing the exhaust steam of the steam turbine, a condensing system for putting the water of the condenser into the steam generator, and a condensate desalination device installed in the condensing system for removing impurities in the fluid. And a bypass system provided in the condensate system to bypass the condensate desalination unit, and circulates the fluid from the steam generator to the steam turbine, the condenser, and the condensate system and operates the circulated fluid at a high pH. In this case, the fluid is circulated to the bypass system, a part of the steam generator water is blown down and discharged, and the discharged blowdown fluid is fed into the condensate desalination unit without passing through the bypass system Characterized by having a system .

[0008] The discharge system is characterized in that a cooling means for cooling the blowdown fluid to a temperature not higher than the ion exchange resin heat resistant temperature of the condensate desalination apparatus is provided. The cooling means is a heat exchange means using a condensate fluid as a cooling medium. Further, the cooling means is a heat exchange means using shaft cooling water of a steam turbine as a cooling medium. Further, the cooling means is a heat exchange means using seawater as a cooling medium. The cooling means is a heat exchange means using a condensate system fluid as a cooling medium and a heat exchange means using a shaft chilled water of a steam turbine as a cooling medium. The cooling means is a heat exchange means using a condensate fluid as a cooling medium and a heat exchange means using seawater as a cooling medium. Further, the cooling unit is characterized in that a plurality of flash tanks are connected in series. Further, the flash tank is provided with a mist separator. Further, a heating means for heating the fluid is provided in a condensate system downstream of the condensate desalination apparatus. Further, it is characterized in that steam from the flash tank is fed into a low-pressure feed water heater to recover heat. In addition, the flash tank has a plurality of stages, and steam from the flash tank is supplied to a low-pressure feedwater heater corresponding to the pressure.

Further, the present invention for achieving the above object comprises a steam generator using pressurized water on the reactor side as a heat source,
A steam turbine driven by steam from a steam generator,
A condenser for condensing the exhaust steam of the steam turbine, a condensate system for introducing the condenser fluid to the steam generator, and a condensate desalination device provided in the condensate system for removing impurities of the fluid, A bypass system is provided in the condensate system and bypasses the condensate desalination device.When the fluid is circulated from the steam generator to the steam turbine, the condenser, and the condensate system, and when the circulated fluid is operated at a high pH, In this system, a fluid is circulated through a bypass system, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is fed into a condensate desalination unit without passing through the bypass system. The heat exchange means for cooling the blowdown fluid using the fluid of the condensing system as a cooling medium is provided in the discharge system, and the heating means is provided in the condensing system between the inlet and outlet flow paths to the heat exchange means. I do.

In order to achieve the above object, the present invention provides a steam generator using pressurized water on the reactor side as a heat source,
A steam turbine driven by steam from a steam generator,
A condenser for condensing the exhaust steam of the steam turbine, a condensate system for introducing the condenser fluid to the steam generator, and a condensate desalination device provided in the condensate system for removing impurities of the fluid, A bypass system is provided in the condensate system and bypasses the condensate desalination equipment.It circulates the fluid from the steam generator to the steam turbine, the condenser, and the condensate system, and elutes iron components etc. in the equipment piping. In order to prevent this, when supplying ammonia to the circulating fluid by supplying ammonia or the like to maintain the fluid at a high pH, the fluid is circulated through the bypass system to eliminate the flow of water to the condensate desalination unit, and to increase the fluid during startup. When not operating at pH, the entire volume of the fluid is passed through the condensate demineralizer, and when operating at high pH, a part of the steam generator fluid is blown down and discharged and the blowdown fluid discharged Condensate without passing through the bypass system A discharge system that removes impurities from the blowdown fluid by placing it in the system is installed, and the blowdown fluid in the discharge system is cooled using the fluid in the condensate system as a cooling medium, thereby lowering the ion exchange resin heat resistance temperature of the condensate desalination unit. The heat exchange means for lowering the temperature of the blowdown fluid is provided in the discharge system, and the heating means for heating the fluid in the condensate system is provided in a plurality of stages in the condensate system between the inlet and outlet flow paths to the heat exchange means. Features.

[0011] In order to achieve the above object, the present invention provides a steam generator using pressurized water on the reactor side as a heat source,
A steam turbine driven by steam from a steam generator,
A condenser for condensing the exhaust steam of the steam turbine, a condensate system for introducing the condenser fluid to the steam generator, and a condensate desalination device provided in the condensate system for removing impurities of the fluid, A bypass system is provided in the condensate system and bypasses the condensate desalination device.When the fluid is circulated from the steam generator to the steam turbine, the condenser, and the condensate system, and when the circulated fluid is operated at a high pH, Circulates the fluid through the bypass system, blows down part of the steam generator fluid and discharges it, and also inputs the discharged blowdown fluid into the condensate desalination unit without passing through the bypass system A cooling system for cooling the blowdown fluid is provided by providing a plurality of flash tanks connected in series to the discharge system, and a mist separator is provided in the flash tank of the cooling unit, while each flash tank is provided. Steam Shutanku characterized in that a charged system which respectively introduced into the low-pressure feed water heater in accordance with the pressure.

[0012] In order to achieve the above object, the present invention provides a steam generator using pressurized water on the reactor side as a heat source,
A steam turbine driven by steam from a steam generator,
A condenser for condensing the exhaust steam of the steam turbine, a condensate system for introducing the condenser fluid to the steam generator, and a condensate desalination device provided in the condensate system for removing impurities of the fluid, A bypass system is provided in the condensate system and bypasses the condensate desalination equipment.When circulating fluid from the steam generator to the steam turbine, condenser, and condensate system, elution of iron components etc. in the equipment piping When operating the fluid at a high pH by adding ammonia or the like to the circulating fluid to prevent water leakage, the fluid is circulated to the bypass system to eliminate water flow to the condensate When not operating at a high pH, the entire amount of fluid is passed through the condensate desalination unit, and when operating at a high pH, a part of the steam generator fluid is blown down and discharged, and the blowdown discharged Condensate dewatering without passing fluid through the bypass system Provide a discharge system that removes impurities from the blowdown fluid by putting it into the system, and connect multiple flash tanks in series to the discharge system to cool the blowdown fluid in the discharge system and condense dewatering Cooling means for lowering the temperature of the blowdown fluid below the ion-exchange resin heat-resistant temperature of the device is provided, and the mist separator is provided in the flash tank of the cooling means, while the steam in each flash tank is supplied to the low-pressure feedwater heater corresponding to the pressure. It is characterized by providing a charging system for charging.

[0013] The condensate desalination apparatus is provided with a plurality of desalination towers in parallel, one inlet line for sending a fluid to the plurality of desalination towers, and water passing from the plurality of desalination towers for ion exchange. One outlet line from which the fluid after being discharged is provided,
The inlet line and the outlet line are communicated with each other through a recirculation path, and the recirculation path is provided with a pump for pumping the fluid on the outlet line side to the inlet line. In addition, branch paths branching from flow paths from a plurality of desalination towers to one outlet line are provided, and the branch paths communicate with the condenser side by one recovery line, and the recovery line and the inlet line are connected. A circulation pump is provided, which is connected to the circulation path and pressure-feeds the fluid on the recovery line side to the inlet line in the recirculation path. In addition, the condensate desalination system operates at a high pH, circulates the fluid through the recirculation system, and secures the minimum flow rate of multiple desalination towers when the blowdown fluid is sent to one inlet line. For this purpose, the pump is driven to pump the fluid on the outlet line side to the inlet line.

In the nuclear power plant of the present invention, a driving means using steam from a steam generator as a driving source, a condenser for condensing exhaust steam of the driving means, and a condenser condensed by the condenser. It consists of a condensate system that feeds the fluid into the steam generator, and a condensate desalination device that is provided in the condensate system and removes impurities of the fluid.The condensate desalination device includes a plurality of desalination towers in parallel. A plurality of desalination towers, one inlet line for sending fluid to the plurality of desalination towers, and one outlet line for discharging the fluid after being ion-exchanged and passed from the plurality of desalination towers. The line is communicated with the recirculation path, and the recirculation path is provided with a pump for pumping the fluid on the outlet line side to the inlet line.

[0015] Branch paths are provided, each branching from a flow path from a plurality of desalination towers to one outlet line, and the branch paths communicate with the condenser side by one recovery line.
The recovery line and the inlet line are communicated with each other through a circulation path, and the circulation path is provided with a circulation pump that pumps the fluid on the recovery line side to the inlet line.

[0016]

FIG. 1 shows the entire configuration of a nuclear power plant according to a first embodiment of the present invention, and FIG. 2 shows the detailed configuration of a condensate desalination apparatus.

As shown in FIG. 1, in a nuclear power plant,
The primary system water (pressurized water) is heated by the heat generated in the reactor 1 and sent to the steam generator 2, where the secondary system water is converted into steam by the high temperature primary system water. The steam turbine 3 is sent to the steam turbine 3
To drive the generator 3a. The exhaust steam of the steam turbine 3 is sent to the condenser 4 and cooled by seawater or the like to be condensed. The water condensed by the condenser 4 is supplied to the steam generator 2 from the condensing system 5. It has become. Condensate system 5
Are, in order from the upstream side, a condensate pump 6, a condensate desalination device 7,
Condenser booster pump 8, low pressure feed water heater 9, and deaerator 1
0 is provided. The low-pressure feed water heater 9 has two to five heaters.
The heaters may be arranged in series.

The condensate desalination unit 7 is provided with a bypass 12 as a bypass system for bypassing the condensate desalination unit 7. A first valve device 13 is provided on the upstream side of the condensate desalination device 7 downstream of the flow path on the base end side of the bypass passage 12, and a second valve device 14 is provided on the bypass passage 12. By closing the first valve device 13 and opening the second valve device, the fluid from the condenser 4 is sent to the steam generator 2 through the bypass passage 12. Conversely, when the first valve device 13 is opened and the second valve device 14 is closed, the fluid from the condenser 4 is passed through the condensate desalination device 7 and sent to the steam generator 2 side.

In the above-mentioned nuclear power plant, a secondary system fluid is circulated by the steam generator 2, the steam turbine 3, the condenser 4 and the condensing system 5 to form a circulation system. Since the steam generator 2 has a structure in which the secondary water exists outside the heat exchange tube of the primary water, the flow outside the heat exchange tube of the primary water in the steam generator 2 It is necessary to prevent scale from accumulating on the constricted portion or stagnation portion. For this reason, in the secondary fluid circulation system, ammonia or the like is introduced into the condensate system 5 downstream of the condensate desalination unit 7 so that iron components and the like in the equipment piping are not eluted by erosion and corrosion. Fluid at high pH
(For example, pH 9.8 to pH 10.0). By operating the fluid at a high pH, elution of iron components such as carbon steel in the secondary fluid circulation system is suppressed.

Ammonia or the like is introduced into the condensate system 5 to increase the pH.
When operating the condensate desalination apparatus 7 by closing the first valve device 13 and opening the second valve apparatus 14 of the condensate desalination apparatus 7, the fluid from the condenser 4 is passed through the bypass 12 If there is no water flow to the system and the system is not operated at high pH, such as during startup,
By opening the valve device 13 and closing the second valve device 14, the entire amount of the fluid from the condenser 4 flows to the condensate desalination device 7.

On the other hand, in the nuclear power plant, the steam generator 2
In order to prevent impurities from accumulating and concentrating in the water, a part of the secondary system water is blown down and discharged from the steam generator 2, and the blown down fluid is collected in the condensing system 5. ing. That is, the steam generator 2 and the condensate system 5 between the first valve device 13 and the condensate desalination device 7 (upstream of the condensate desalination device 7 and downstream of the bypass system branch) discharge. The system 15 is constructed, and the fluid obtained by blowing down a part of the secondary system water is supplied to the condensate system 5 by the discharge system 15.

When operating at a high pH, a part of the secondary system water is blown down even if the fluid from the condenser 4 is passed through the bypass path 12 and the water is not passed to the condensate desalination unit 7. The discharged fluid can be passed to the condensate desalination device 7 by the discharge system 15. Therefore, it is possible to remove impurities from the fluid obtained by blowing down a part of the secondary water without providing a dedicated device for removing impurities from the blown-down fluid.

A flash tank 21 is provided in the discharge system 15, and a part of secondary water blown down by the steam generator 2 is introduced into the flash tank 21. The flash tank 21 is provided with a mist separator 22. The mist separator 22 separates the fluid and the steam returned to the flash tank 21 from each other.
Sent to 0. Cooling means 16 is provided in the discharge system 15 downstream of the flash tank 21, and the blowdown fluid discharged from the steam generator 2 by the cooling means 16 is used in the condensate desalination apparatus 7 with the ion-exchange resin heat-resistant temperature (for example, 40 ° C.). ) It is cooled below. Reference numeral 23 in the drawing denotes a supply pump provided in the discharge system 15. Note that the supply pump 23 may not be provided. Reference numeral 24 in the figure denotes a switching valve, which is operated when a part of the secondary water blown down is directly sent to the condenser 4.

The cooling means 16 comprises heat exchangers 17 and 18 as heat exchange means.
Uses the fluid of the condensate system 5 as a cooling medium. That is, the extraction line 2 is located upstream of the low-pressure feedwater heater 9 in the condensate system 5.
0, and the extraction line 20 is connected to the condensing system 5 downstream of the low-pressure feedwater heater 9 via the heat exchangers 18 and 17.
To join. In addition, the heat exchanger as the heat exchange means is:
One or three or more pieces may be used. Also,
A heat exchanger 19 as heat exchange means is provided downstream of the supply pump 23, and the heat exchanger 19 uses seawater (or cold water of a steam turbine shaft) as a cooling medium. In addition, heat exchanger 1
9 may not be installed.

The condensate desalination apparatus 7 will be described with reference to FIG. As shown in the figure, the condensate desalination unit 7 has six desalination towers 3.
1 are provided in parallel, and one inlet line 32 for sending fluid from the condenser 4 and the discharge system 15 to six desalination towers 31 is provided. The desalting tower 31 is filled with an ion exchange resin, and removes impurities of the fluid by ion exchange. The number of desalination towers 31 is not limited to six as long as it is two or more. One entrance line 32
The fluid from the condenser 4 and the discharge system 15 is sent to the respective desalination towers 31 via the inlet valves 33 respectively. Each of the six desalination towers 31 has an outlet passage 3 through an outlet valve 34.
From 5, one of the outlet lines 36 is supplied with water after being subjected to water exchange and ion exchange, and the outlet line 36 communicates with the condensing system 5.

The outlet line 36 and the inlet line 32 are communicated with each other through a recirculation path 41, and the recirculation path 41 is provided with a recycle pump 42 for pumping the fluid on the outlet line 36 side to the inlet line 32. In the desalination tower 31, the minimum flow rate of the fluid is set in order to secure the processing capability of impurities. When operating at a high pH, the fluid from the condenser 4 is passed through the bypass 12 to eliminate the flow of water to the condensate desalination unit 7, and the blowdown fluid from the discharge system 15 is supplied to the condensate desalination unit 7. When sent, the blowdown fluid is about 1% to 3% of the total flow rate, so that the minimum flow rate of the fluid in the desalination tower 31 (flow rate for ensuring processing capacity) cannot be secured. For this reason, if only the blowdown fluid is sent to the condensate desalination unit 7, the recycle pump 4
2 is driven to secure a necessary fluid flow rate in the system of the six desalination towers 31.

When operating at a high pH, the fluid from the condenser 4 is passed through the bypass 12 to eliminate the flow of water to the condensate desalination unit 7 and the blowdown fluid discharged from the steam generator 2 is discharged. When the condenser is leaked out of the system and the condenser 4 leaks from the condenser, the fluid from the condenser 4 is condensed by the condensate desalination device 7.
It is necessary to pass water. In this case, since the fluid from the condenser 4 rapidly flows through the condensate desalination device 7, the outlet water quality of the condensate desalination device 7 temporarily deteriorates. In order to prevent this temporary deterioration in water quality, when operating at a high pH, when the fluid from the condenser 4 is flowing through the bypass passage 12, the recycle pump 42 is driven to drive the six desalination towers. A required fluid flow rate is ensured in the system 31.

Although it is conceivable to make the fluid flow through only some of the desalination towers 31, the deterioration of some of the desalination towers 31 progresses, and the frequency of the work of restoring the regenerating capacity becomes high. Ability is inferior.

On the other hand, a branch passage 37 is provided branching from the upstream side of the outlet valve 34 of each of the outlet passages 35, and the branch passage 37 is connected to the condenser 4 via the branch valve 38.
9 in communication. The recovery path 39 and the inlet line 32 are communicated with each other through a circulation path 40, and the circulation path 40 is provided with a circulation pump 43 for pumping the fluid on the recovery path 39 side to the inlet line 32. Open the desired inlet valve 33 and the desired outlet valve 3
By closing the desired branch valve 38 and opening the desired branch valve 38 and driving the circulation pump 43, the fluid from the inlet line 32 flows through the desired desalination tower 31 and is circulated to the condenser 4.

This is, for example, at the time of an operation in which the flow of only the deteriorated desalination tower 31 is stopped to perform the ion exchange capacity recovery work (ion exchange resin regeneration work) individually, or the minimum flow rate of the fluid in the desalination tower 31. (Flow rate to ensure processing capacity) during standby operation to secure the ion exchange capacity of the desalting tower 31 or all or all of the towers at the same time. It is applied at the time of driving or the like. In addition, by controlling the opening and closing of the second valve device 14, the inlet valve 33, the outlet valve 34, and the branch valve 38, and the drive control of the recycle pump 42 and the circulation pump 43, the condensate desalination device 7 Various water flow modes such as partial water flow and total water flow can be appropriately selected according to the situation.

The condensate desalination apparatus 7 having the above-described structure is used not only for the nuclear power generation equipment to which the fluid from the condenser 4 and the discharge system 15 is sent, but also for the treatment of impurities in the blowdown fluid and the condenser 4.
The present invention can be applied to other than the nuclear power plant shown in FIG. The recycle pump 42 and the circulation pump 4
3 are provided independently, but the recycle pump 42 (circulation pump 43) is replaced by the circulation pump 43 (recycle pump 42).
It is also possible to use a jet pump using the discharged fluid as a drive source.

In the nuclear power plant having the above configuration, the condensate water downstream of the condensate and desalination unit 7 is disposed in the secondary fluid circulation system so that iron components and the like in the equipment pipes are not eluted by erosion and corrosion. Ammonia or the like is introduced into the system 5 to operate the fluid at a high pH (for example, pH 9.8 to pH 10.0). If the fluid is operated at a high pH by introducing ammonia or the like into the condensate system 5, the ammonia concentration of the fluid at the outlet side of the condenser 4 increases, and the impurity treatment capacity of the condensate desalination unit 7 is exceeded. Resulting in. Therefore, when the secondary fluid is operated at a high pH, the first condensate
By closing the valve device 13 and opening the second valve device 14,
The fluid from the condenser 4 is passed through the bypass passage 12 to eliminate the flow of water to the condensate desalination device 7. Thereby, the impurity treatment capacity in the condensate desalination unit 7 is ensured.

On the other hand, in order to prevent the accumulation and concentration of impurities in the steam generator 2, a part of the secondary system water is blown down and discharged from the steam generator 2, and the blown down fluid is discharged. The water is fed from the discharge system 15 to the condensate desalination device 7 and collected in the condensate system 5. At this time, only a small part of the secondary system fluid is sent to the condensate desalination unit 7, and the desalination tower 31 of the condensate desalination unit 7 has the minimum flow rate for maintaining the processing capacity. Is not secured. Therefore, the inlet valve 33 and the outlet valve 34 are opened, the branch valve 38 is closed, and the recycle pump 42 is driven to drive the six desalination towers 31 until a flow rate that maintains the processing capacity of the desalination tower 31 is secured. The required fluid flow rate is ensured in the system. As a result, even when the fluid is operated at a high pH,
The blown-down fluid can be passed through the condensate and desalination device 7, and the impurities can be sufficiently removed.

Further, since the fluid blown down by the cooling means 16 is cooled, the temperature of the fluid can be kept below the heat-resistant temperature of the ion exchange resin of the condensate desalination unit 7.
Deterioration of the ion exchange resin of the condensate desalination device 7 can be prevented. Further, since the cooling means 16 is constituted by the heat exchangers 17 and 18 for exchanging heat with the fluid in the condensate system 5, heat recovery of the blown-down fluid can be effectively performed.

A nuclear power plant according to the second embodiment of the present invention will be described. FIG. 3 shows the entire configuration of a nuclear power plant according to the second embodiment of the present invention. The same components as those shown in FIG. 1 are denoted by the same reference numerals. FIG.
The nuclear power plant shown in FIG. 1 differs from the nuclear power plant shown in FIG. 1 in the configuration of a discharge system for introducing a fluid obtained by blowing down a part of the secondary system water into the condensing system 5.

As shown in the figure, in the nuclear power plant, the secondary system water is converted into steam by the steam generator 2 by the heat of the primary system water of the nuclear reactor 1, and the steam turbine 3 is driven by the steam. Activate the generator 3a. The exhaust steam of the steam turbine 3 is sent to a condenser 4 to be condensed, and the water condensed by the condenser 4 is supplied to a steam generator 2 from a condensing system 5. The condensate system 5 includes a condensate pump 6, a condensate desalination device 7, a condensate booster pump 8, a low-pressure feedwater heater 9, and a deaerator 10 in this order from the upstream side. The low-pressure feed water heater 9 is a four-stage heater
9a, 9b, 9c, 9 are arranged in series.

The condensate desalination unit 7 is provided with a bypass 12 as a bypass system for bypassing the condensate desalination unit 7. A first valve device 13 is provided on the upstream side of the condensate desalination device 7 downstream of the flow path on the base end side of the bypass passage 12, and a second valve device 14 is provided on the bypass passage 12. By closing the first valve device 13 and opening the second valve device, the fluid from the condenser 4 is sent to the steam generator 2 through the bypass passage 12. Conversely, when the first valve device 13 is opened and the second valve device 14 is closed, the fluid from the condenser 4 is passed through the condensate desalination device 7 and sent to the steam generator 2 side.

In the above-described nuclear power plant, a secondary system fluid is circulated by the steam generator 2, the steam turbine 3, the condenser 4 and the condensing system 5 to form a circulation system. Since the steam generator 2 has a structure in which the secondary water exists outside the heat exchange tube of the primary water, the flow outside the heat exchange tube of the primary water in the steam generator 2 It is necessary to prevent the scale from accumulating on the squeezed portion and stagnation portion. For this reason, in the secondary fluid circulation system, ammonia or the like is introduced into the condensate system 5 downstream of the condensate desalination unit 7 so that iron components and the like in the equipment piping are not eluted by erosion and corrosion. High fluid
It can be operated as pH (for example, pH 9.8 to pH 10.0). By operating the fluid at a high pH, elution of iron components and the like of carbon steel in the secondary fluid circulation system is suppressed.

Ammonia or the like is introduced into the condensate system 5 to increase the pH.
When operating the condensate desalination apparatus 7 by closing the first valve device 13 and opening the second valve apparatus 14 of the condensate desalination apparatus 7, the fluid from the condenser 4 is passed through the bypass 12 When the system is not operated at a high pH, such as at the time of startup, when the flow of water from the condenser 4 is opened and the second valve apparatus 14 is closed, the fluid from the condenser 4 is conveyed to the condensate desalination apparatus 7. Let all water through.

On the other hand, in the nuclear power plant, the steam generator 2
In order to prevent impurities from accumulating and concentrating in the water, a part of the secondary system water is blown down and discharged from the steam generator 2, and the blown down fluid is collected in the condensing system 5. ing. That is, the steam generator 2 and the condensate system 5 between the first valve device 13 and the condensate desalination device 7 (upstream of the condensate desalination device 7 and downstream of the bypass system branch) discharge. A system 51 is constructed, and the fluid obtained by blowing down a part of the secondary system water is supplied to the condensate system 5 by the discharge system 51.

In the case of operating at a high pH, even if the fluid from the condenser 4 is passed through the bypass passage 12 and the water is not passed to the condensate desalination unit 7, a part of the secondary system water is blown down. The discharged fluid can be passed through the condensate desalination device 7 by the discharge system 51. Therefore, it is possible to remove impurities from the fluid obtained by blowing down a part of the secondary water without providing a dedicated device for removing impurities from the blown-down fluid.

The discharge system 51 is provided with a flash tank 21 constituting a part of the cooling means 52,
A part of the secondary water blown down in step is introduced into the flash tank 21. The flash tank 21 is provided with a mist separator 22. The mist separator 22 separates the fluid and steam returned to the flash tank 21, and the separated steam is sent to the deaerator 10. By providing the mist separator 22 in the flash tank 21, the tank capacity of the flash tank 21 can be reduced.

The discharge system 5 downstream of the flash tank 21
1 is provided with a cooling means 52, and the blowdown fluid discharged from the steam generator 2 is cooled by the cooling means 52 to a temperature lower than the heat-resistant temperature (for example, 40 degrees) of the ion exchange resin of the condensate desalination unit 7. Reference numeral 23 in the drawing denotes a supply pump provided in the discharge system 51. Further, a heat exchanger 19 as heat exchange means is provided downstream of the supply pump 23,
The heat exchanger 19 uses seawater (or cold water of a steam turbine shaft) as a cooling medium.

The cooling means 52 includes the first flash tank 5
3, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56 are connected in series, and the liquid separated by steam and water in the flash tank 21 is charged into the first flash tank 53, The liquid separated in the flash tank 53 is supplied to the second flash tank 54, the liquid separated in the second flash tank 54 is supplied to the third flash tank 55, and the liquid is supplied to the third flash tank 55. The separated liquid is charged into the fourth flash tank 56, and the liquid separated in the fourth flash tank 56 is supplied to the supply pump 2
By 3, it is sent to the condensate system 5 via the heat exchanger 19.
Although the cooling means 52 is constituted by the first flash tank 53, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56, depending on the type of equipment, two or more arbitrary number of flash tanks may be used. It is also possible to configure the cooling means 52.

The gas (steam) separated by water and water in the first flash tank 53 is supplied to the heater 9d of the low-pressure feed water heater 9 through a charging path 53a as a charging system. The separated gas (steam) is supplied to the heater 9c of the low-pressure feed water heater 9 through a charging path 54b as a charging system, and the gas (steam) separated in the third flash tank 55 is separated from the low-pressure feed water heater 9 by the third flash tank 55. The gas (steam) which is supplied to the heater 9b of the low pressure feed water heater 9 through the charging path 55c as a charging system, and further separated into steam and water by the fourth flash tank 56, is supplied to the heater 9a of the low pressure water heater 9 as a charging system. Injected via 56d. That is, the first flash tank 53,
Second flash tank 54, third flash tank 55
The steam in the fourth flash tank 56 is supplied to the low-pressure water heater 9 according to the pressure. Although the number of flash tanks and the number of heaters are the same, steam from multiple flash tanks is supplied to the heater of one low-pressure feed water heater, or steam is supplied from one flash tank to multiple low-pressure feed water heaters. Various changes, such as insertion, can be made.

Since the condensate desalination unit 7 has the same configuration as the nuclear power plant of the first embodiment shown in FIG. 1, the details are as shown in FIG. Therefore, detailed description is omitted here.

In the nuclear power plant having the above configuration, the condensate is condensed on the downstream side of the condensate and desalination unit 7 in the secondary fluid circulation system so that iron components and the like in the equipment piping are not eluted by erosion and corrosion. Ammonia or the like is introduced into the system 5 to operate the fluid at a high pH (for example, pH 9.8 to pH 10.0). If the fluid is operated at a high pH by introducing ammonia or the like into the condensate system 5, the ammonia concentration of the fluid at the outlet side of the condenser 4 increases, and the impurity treatment capacity of the condensate desalination unit 7 is exceeded. Resulting in. Therefore, when the secondary fluid is operated at a high pH, the first condensate
By closing the valve device 13 and opening the second valve device 14, the fluid from the condenser 4 passes through the bypass path 12, thereby eliminating the flow of water to the condensate desalination device 7. Thereby, the impurity treatment capacity in the condensate desalination unit 7 is ensured.

On the other hand, in order to prevent the accumulation and concentration of impurities in the steam generator 2, a part of the secondary system water is blown down and discharged from the steam generator 2, and the blown down fluid is discharged. The water is supplied from the discharge system 51 to the condensate desalination device 7 and collected in the condensate system 5. At this time, only a small part of the secondary system fluid is sent to the condensate desalination unit 7 and the desalination tower 31 of the condensate desalination unit 7 (see FIG. 2).
Means that the minimum flow rate for maintaining the processing capacity is not secured. For this reason, the recycle pump 42 (see FIG. 2) is driven to operate the six desalination towers 31 (see FIG. 2) until a flow rate that maintains the processing capacity of the desalination tower 31 (see FIG. 2) is secured. The necessary fluid flow rate is ensured in the system. As a result, even when the fluid is operated at a high pH, the blown-down fluid can be passed through the condensate desalination device 7,
It is possible to sufficiently remove impurities.

The cooling means 5 in which the first flash tank 53, the second flash tank 54, the third flash tank 55 and the fourth flash tank 56 are connected in series.
Since the fluid blown down by step 2 is separated by steam and water for cooling, the temperature of the fluid can be kept below the heat-resistant temperature of the ion-exchange resin of the condensate desalination unit 7. Deterioration of the ion exchange resin can be prevented. In addition, since the steam separated from the water in the first flash tank 53, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56 is supplied to the low-pressure water heater 9 according to the pressure. Thus, heat recovery of the blown-down fluid can be effectively performed.

[0050]

The nuclear power plant of the present invention has a steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, and condensing steam exhausted from the steam turbine. Condenser, a condenser system that feeds water from the condenser to the steam generator, a condensate desalination device installed in the condenser system to remove fluid impurities, and a condenser installed in the condenser system It has a bypass system that bypasses the desalination equipment, circulates fluid from the steam generator to the steam turbine, condenser, and condensate system, and circulates fluid to the bypass system when the circulated fluid is operated at a high pH. The system is equipped with a discharge system that blows down part of the steam generator water and discharges the discharged blowdown fluid into the condensate desalination unit without passing through the bypass system. Even when operating at pH, dedicated processing The blow-down fluid can be passed through the condensate and desalination apparatus without providing a treatment device, so that impurities can be sufficiently removed. As a result,
It is possible to remove impurities of the blowdown fluid from the steam generator without increasing the cost.

Since a cooling means for cooling the blowdown fluid to a temperature lower than the heat resistant temperature of the ion exchange resin of the condensate desalination apparatus is provided in the discharge system, the temperature of the blowdown fluid is reduced by the heat resistance of the ion exchange resin of the condensate desalination apparatus. The temperature can be kept below the temperature, and the deterioration of the ion exchange resin of the condensate desalination apparatus can be prevented. Further, since the cooling means is a heat exchange means using the fluid of the condensing system as a cooling medium, the heat recovery efficiency can be improved. Further, since the cooling means is a heat exchange means using the shaft chilled water of the steam turbine as a cooling medium, it is possible to easily cool the blowdown fluid. Further, since the cooling means is a heat exchange means using seawater as a cooling medium, it is possible to easily cool the blowdown fluid. Further, since the cooling means is a heat exchange means using a condensate system fluid as a cooling medium and a heat exchange means using a shaft chilled water of a steam turbine as a cooling medium, the heat recovery efficiency is improved and the cooling of the blowdown fluid is facilitated. It is possible to do. Further, since the cooling means is a heat exchange means using the fluid of the condensate system as a cooling medium and a heat exchange means using seawater as a cooling medium, it is possible to enhance the heat recovery efficiency and easily cool the blowdown fluid. become.

Further, since the cooling means is constituted by connecting a plurality of flash tanks in series, it is possible to easily cool the blowdown fluid. Further, since the flash tank is provided with the mist separator, the tank volume of the flash tank can be reduced. In addition, since the steam in the flash tank is supplied to the low-pressure feedwater heater, heat recovery of blowdown water becomes possible. Further, since the steam of each flash tank is supplied to each of the plurality of low-pressure feedwater heaters corresponding to the pressure, heat can be accurately recovered, and the plant efficiency can be further improved.

Also, the nuclear power plant of the present invention comprises a steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, and condensing steam exhausted from the steam turbine. Condenser, a condenser system that feeds the condenser fluid to the steam generator, a condensate desalination device that is provided in the condenser system to remove fluid impurities, and a condenser that is provided in the condenser system. It has a bypass system that bypasses the desalination unit.When the fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system, and when the circulated fluid is operated at a high pH, the fluid is circulated to the bypass system. A discharge system is provided for discharging a part of the steam generator fluid by blowdown and discharging the blowdown fluid into the condensate desalination unit without passing through the bypass system. As a cooling medium Heat exchange means for cooling down fluid is provided in the discharge system, and heating means is provided in the condensate system between the inlet and outlet flow paths to the heat exchange means, so that the blown-down fluid is condensed without providing a dedicated processing device. It can be passed through a condensate desalination unit while keeping the temperature of the desalination unit below the ion-exchange resin heat-resistant temperature.
Impurities can be sufficiently removed by preventing deterioration of the ion exchange resin of the condensate desalination apparatus. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing the cost, and a nuclear power plant with excellent plant efficiency can be obtained.

Also, the nuclear power plant of the present invention comprises a steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, and condensing steam exhausted from the steam turbine. Condenser, a condenser system that feeds the condenser fluid to the steam generator, a condensate desalination device that is provided in the condenser system to remove fluid impurities, and a condenser that is provided in the condenser system. A bypass system that bypasses the desalination equipment, circulates the fluid from the steam generator to the steam turbine, condenser, and condensate system, and circulates ammonia to prevent the elution of iron components and the like in the equipment piping. To increase the fluid
When operating at pH, the fluid is circulated through the bypass system to eliminate water flow to the condensate
When not operating at pH, the entire volume of the fluid is passed through the condensate demineralizer, and when operating at high pH, a part of the steam generator fluid is blown down and discharged and the blowdown fluid discharged Is installed in the condensate desalination unit without passing water through the bypass system and sent to the condensate desalination unit to remove impurities in the blowdown fluid. Heat exchange means for cooling the blowdown fluid to lower the temperature of the blowdown fluid below the ion-exchange resin heat-resistant temperature of the condensate desalination unit is provided in the discharge system, and the condensate between the inlet and outlet flow paths to the heat exchange means Since the heating system for heating the condensate system fluid is provided in multiple stages in the system, the blow-down fluid is kept at a temperature lower than the ion-exchange resin heat-resistant temperature of the condensate desalination unit without providing a dedicated processing unit. The condensate can be passed through the condensate desalination apparatus in a state, and the heat recovery efficiency can be increased, and the impurities can be sufficiently removed by preventing the ion exchange resin of the condensate desalination apparatus from deteriorating. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing the cost, and a nuclear power plant with excellent plant efficiency can be obtained.

Further, the nuclear power plant of the present invention comprises a steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, and condensing steam exhausted from the steam turbine. Condenser, a condenser system that feeds the condenser fluid to the steam generator, a condensate desalination device that is provided in the condenser system to remove fluid impurities, and a condenser that is provided in the condenser system. It has a bypass system that bypasses the desalination unit.When the fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system, and when the circulated fluid is operated at a high pH, the fluid is circulated to the bypass system. A discharge system is provided for discharging a part of the steam generator fluid by blowdown and discharging the blowdown fluid into the condensate desalination unit without passing through the bypass system. Flash tank The cooling means that cools the blowdown fluid is configured by connecting to the rows, and the mist separator is provided in the flash tank of the cooling means, while the steam in each flash tank is supplied to a plurality of feed water heaters according to the pressure Since the injection system is installed, the blown-down fluid can be passed through the condensate desalination unit while keeping it at or below the ion-exchange resin heat-resistant temperature of the condensate desalination unit without providing a dedicated processing unit. In addition to increasing the recovery efficiency, it is possible to prevent the deterioration of the ion exchange resin of the condensate desalination apparatus and sufficiently remove impurities. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing the cost, and a nuclear power plant with excellent plant efficiency can be obtained.

Also, the nuclear power plant of the present invention comprises a steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, and condensing steam exhausted from the steam turbine. Condenser, a condenser system that feeds the condenser fluid to the steam generator, a condensate desalination device that is provided in the condenser system to remove fluid impurities, and a condenser that is provided in the condenser system. A bypass system that bypasses the desalination equipment.When circulating fluid from the steam generator to the steam turbine, condenser, or condensate system, the fluid is circulated to prevent elution of iron components etc. in the equipment piping. When operating the fluid at a high pH by adding ammonia, etc., circulate the fluid to the bypass system to eliminate water flow to the condensate desalination unit. Pass the entire amount of fluid through the condensate When operating as a pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is fed to the condensate desalination device without passing through the bypass system, and the condensate desalination device A discharge system that removes impurities from the blowdown fluid is installed in the discharge system, and a plurality of flash tanks are connected in series to the discharge system to cool the blowdown fluid in the discharge system and ionize the condensate desalination unit. Cooling means for lowering the temperature of the blowdown fluid below the exchange resin heat-resistant temperature is provided.A mist separator is provided in the flash tank of the cooling means, and steam from each flash tank is supplied to a plurality of low-pressure feedwater heaters corresponding to the pressure. Because of the provision of a dosing system, the blown-down fluid was maintained at a temperature below the ion exchange resin heat resistance temperature of the condensate and desalination unit without providing a dedicated processing unit. Can be passed through the condensate demineralizer in state, to increase the heat recovery efficiency, it is possible to sufficiently perform the removal of impurities to prevent breakage of the condensate demineralizer. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing the cost, and a nuclear power plant with excellent plant efficiency can be obtained.

The condensate desalination apparatus is provided with a plurality of desalination towers in parallel, and has one inlet line for sending fluid to the plurality of desalination towers, and water is passed from the plurality of desalination towers and ion-exchanged. One outlet line from which the fluid after being discharged is provided,
The inlet line and the outlet line are communicated with the recirculation path, and the recirculation path is provided with a pump for pumping the fluid on the outlet line side to the inlet line. An effective flow rate can be secured in the system. As a result, it can be easily applied to the treatment of impurities in the blowdown fluid.

The condensate desalination apparatus operates at a high pH, circulates the fluid through a bypass system, and sends the minimum flow rate of a plurality of desalination towers when the blowdown fluid is sent to one inlet line. The pump is driven to pump out the fluid on the outlet line side to the inlet line to ensure that the effective flow rate of the desalination tower can be ensured in the system even with a small amount of blowdown fluid. it can. As a result, it can be easily applied to the treatment of impurities in the blowdown fluid.

In the nuclear power plant of the present invention, a driving means using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the driving means, and a condenser for condensing water. It consists of a condensate system that feeds the fluid into the steam generator, and a condensate desalination device that is provided in the condensate system and removes impurities of the fluid. A plurality of desalination towers, one inlet line for sending fluid to the plurality of desalination towers, and one outlet line for discharging the fluid after being ion-exchanged and passed from the plurality of desalination towers. The line is connected to the recirculation path, and the recirculation path is provided with a pump for pumping the fluid on the outlet line side to the inlet line. Can be secured.

[0060] Branch paths are provided, each branching from a flow path from a plurality of desalination towers to one outlet line, and the branch paths communicate with the condenser side by one recovery line.
Since the recovery line and the inlet line are communicated with each other through the circulation path, and the circulation path is provided with a circulation pump for pumping the fluid on the recovery line side to the inlet line, the fluid from the condenser is partially passed. Becomes possible.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a nuclear power plant according to a first embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of a condensate desalination apparatus.

FIG. 3 is an overall configuration diagram of a nuclear power plant according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nuclear reactor 2 Steam generator 3 Steam turbine 4 Condenser 5 Condensate system 6 Condensate pump 7 Condensate desalination device 8 Condensate booster pump 9 Low pressure feed water heater 10 Deaerator 12 Bypass path 13 First valve device 14 second valve device 15 discharge system 16 cooling means 17, 18, 19 heat exchanger 20 extraction line 21 flash tank 22 mist separator 23 supply pump 31 desalination tower 32 inlet line 33 inlet valve 34 outlet valve 35 outlet line 36 outlet line 37 branch path 38 branch valve 39 recovery path 40 circulation path 41 recirculation path 42 recycle pump 43 circulation pump 51 discharge system 52 cooling means 53a, 54b, 55c, 56d charging path 53 first flash tank 54 second flash tank 55 third Flash Tank 56 4th Flash Tank

Claims (21)

[Claims] 1. A steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the steam turbine, and a condensate Condensate system that feeds water from the steam generator to the steam generator, condensate desalination device that is provided in the condensate system to remove fluid impurities, and bypass system that is provided in the condensate system and bypasses the condensate desalination device When circulating the fluid from the steam generator to the steam turbine, the condenser, and the condensing system and operating the circulating fluid at a high pH, the fluid is circulated to the bypass system, and the water of the steam generator is A nuclear power plant comprising a discharge system that discharges a part of the blowdown fluid and blows the discharged blowdown fluid into a condensate desalination apparatus without passing through a bypass system. 2. The nuclear power plant according to claim 1, wherein a cooling means for cooling the blowdown fluid to a temperature not higher than the heat resistant temperature of the ion exchange resin of the condensate desalination apparatus is provided in the discharge system. 3. The nuclear power plant according to claim 2, wherein the cooling means is heat exchange means using a condensate system fluid as a cooling medium. 4. The nuclear power plant according to claim 2, wherein the cooling means is a heat exchange means using shaft chilled water of a steam turbine as a cooling medium. 5. The nuclear power plant according to claim 2, wherein the cooling means is a heat exchange means using seawater as a cooling medium. 6. The nuclear power plant according to claim 2, wherein the cooling means is a heat exchange means using a condensate system fluid as a cooling medium and a heat exchange means using a shaft chilled water of a steam turbine as a cooling medium. . 7. The nuclear power plant according to claim 2, wherein the cooling means is a heat exchange means using a condensate system fluid as a cooling medium and a heat exchange means using seawater as a cooling medium. 8. The nuclear power plant according to claim 2, wherein the cooling means is configured by connecting a plurality of flash tanks in series. 9. The nuclear power plant according to claim 8, wherein the flash tank is provided with a mist separator. 10. The nuclear power plant according to claim 1, wherein a heating means for heating the fluid is provided in a condensate system downstream of the condensate desalination apparatus. 11. The method according to claim 8, wherein
A nuclear power plant, wherein a heating means for heating a fluid using steam in a flash tank as a heat source is provided in a condensate system downstream of a condensate desalination apparatus. 12. The nuclear power plant according to claim 11, wherein a plurality of heating means are provided in accordance with the pressure, and steam in each flash tank is supplied to the heating means in accordance with the pressure. 13. A steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the steam turbine,
A condensate system that feeds the fluid of the condenser to the steam generator, a condensate desalination device that is provided in the condensate system and removes impurities of the fluid, and bypasses the condensate desalination device that is provided in the condensate system. A bypass system is provided to circulate fluid from the steam generator to the steam turbine, condenser, and condensate system.When operating the circulating fluid at a high pH, the fluid is circulated to the bypass system, Provide a discharge system that blows down a part of the fluid and discharges the discharged blowdown fluid into the condensate desalination device without passing through the bypass system, and blows down the fluid in the condensate system as the cooling medium A nuclear power plant, wherein a heat exchange means for cooling a fluid is provided in a discharge system, and a heating means is provided in a condensate system between an inlet / outlet passage for the heat exchange means. 14. A steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the steam turbine,
A condensate system that feeds the fluid of the condenser to the steam generator, a condensate desalination device that is provided in the condensate system and removes impurities of the fluid, and bypasses the condensate desalination device that is provided in the condensate system. A bypass system is provided, which circulates the fluid from the steam generator to the steam turbine, condenser, and condensate system, and injects ammonia, etc. into the circulated fluid to prevent elution of iron components etc. in the equipment piping. When the system is operated at high pH, the fluid is circulated to the bypass system to eliminate water flow to the condensate desalination unit. When operating the system at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is condensed without passing through the bypass system. Into the blowdown fluid to remove impurities Heat exchange that lowers the temperature of the blow-down fluid below the ion-exchange resin heat-resistant temperature of the condensate demineralizer by cooling the blow-down fluid in the discharge system using the condensate fluid as a cooling medium. A nuclear power plant, wherein the means is provided in a discharge system, and a plurality of superheating means for superheating the fluid in the condensate system are provided in the condensate system between the inlet and outlet flow paths to the heat exchange means. 15. A steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the steam turbine,
A condensate system that feeds the fluid of the condenser to the steam generator, a condensate desalination device that is provided in the condensate system and removes impurities of the fluid, and bypasses the condensate desalination device that is provided in the condensate system. A bypass system is provided to circulate fluid from the steam generator to the steam turbine, condenser, and condensate system.When operating the circulating fluid at a high pH, the fluid is circulated to the bypass system, Provide a discharge system that blows down a part of the fluid and discharges the discharged blowdown fluid into the condensate desalination unit without passing through the bypass system, and connects multiple flash tanks to the discharge system in series A cooling means for cooling the blowdown fluid is provided by providing the mist separator in the flash tank of the cooling means, and a plurality of heating means are provided in the condensate system according to the pressure, and each cooling means is provided. A nuclear power plant, comprising: an input system for inputting steam from a rush tank to heating means corresponding to pressure. 16. A steam generator using pressurized water on the reactor side as a heat source, a steam turbine using steam from the steam generator as a driving source, a condenser for condensing exhaust steam of the steam turbine,
A condensate system that feeds the fluid of the condenser to the steam generator, a condensate desalination device that is provided in the condensate system and removes impurities of the fluid, and bypasses the condensate desalination device that is provided in the condensate system. When a fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system, ammonia is injected into the circulated fluid to prevent elution of iron components etc. in the equipment piping. When the fluid is operated at a high pH, the fluid is circulated to the bypass system to eliminate the flow of water to the condensate desalination equipment, and when the fluid is not operated at a high pH at startup or the like, the fluid is condensed and desalted. When the system is operated at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is condensed and desalted without passing through the bypass system. Blowdown fluid impurities introduced into equipment A discharge system to be removed is provided, and a plurality of flash tanks are connected in series to the discharge system to cool the blowdown fluid in the discharge system and blow down to below the ion exchange resin heat resistant temperature of the condensate desalination unit. A cooling means for lowering the temperature of the fluid is provided, and a mist separator is provided in the flash tank of the cooling means, while a plurality of heating means corresponding to the pressure are provided in the condensate system, and the steam in each flash tank is heated according to the pressure. A nuclear power plant, characterized in that an input system for inputting each of the means is provided. 17. The condensate desalination apparatus according to claim 1, wherein a plurality of desalination towers are provided in parallel, and one inlet line for sending a fluid to the plurality of desalination towers. And one outlet line from which the fluid after being ion-exchanged after being passed through the plurality of desalination towers is provided, and the inlet line and the outlet line are communicated with the recirculation path, and the recirculation path A nuclear power plant comprising a pump for pumping a fluid on an outlet line side to an inlet line. 18. The apparatus according to claim 17, wherein branch paths are provided, each branching from a flow path from the plurality of desalination towers to one outlet line, and the branch paths communicate with the condenser side by one recovery line. A nuclear power plant, wherein the recovery line and the inlet line are communicated with each other through a circulation path, and the circulation path is provided with a second pump for pumping the fluid on the recovery line side to the inlet line. 19. The condensate desalination apparatus according to claim 17, wherein the condensate is operated at a high pH and the fluid is circulated to a bypass system, and the blowdown fluid is supplied to one inlet line. A nuclear power plant, characterized in that when sent, a pump is driven to pump the fluid on the outlet line side to the inlet line in order to secure the minimum flow rate of the plurality of desalination towers. 20. A driving means using steam from a steam generator as a driving source, a condenser for condensing exhaust steam of the driving means,
The condensate system consists of a condensate system that feeds the fluid condensed by the condenser to the steam generator, and a condensate desalination device that is provided in the condensate system and removes impurities in the fluid. One desalination tower is provided in parallel, one inlet line for sending fluid to a plurality of desalination towers, and one outlet line for discharging the fluid after being ion-exchanged through water from the plurality of desalination towers Is provided, the inlet line and the outlet line are communicated with the recirculation path,
A nuclear power plant, wherein a pump for pumping fluid on an outlet line side to an inlet line is provided in a recirculation path. 21. The apparatus according to claim 20, wherein branch paths branching from a flow path from the plurality of desalination towers to one outlet line are provided, and the branch paths communicate with the condenser side by one recovery line. A nuclear power plant, wherein the recovery line and the inlet line are communicated with each other through a circulation path, and the circulation path is provided with a second pump for pumping the fluid on the recovery line side to the inlet line.