JP4095738B2 - Nuclear power generation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nuclear power generation facility that drives a turbine generator by converting secondary water into steam by heat generated in a nuclear reactor.
[0002]
[Prior art]
In general, in a nuclear power generation facility, primary water is heated by heat generated in a nuclear reactor, and the heated high-temperature primary water is sent to a steam generator. The water in the next system is changed to steam and the steam turbine is driven to operate the generator. The steam that has finished its work in the steam turbine is cooled by seawater in the condenser and condensed, and returned to the steam generator. A condensate demineralizer is provided on the downstream side of the condenser, and impurities of the fluid condensed by the condenser are ion-exchanged and removed by the condensate demineralizer. In nuclear power generation facilities, in order to prevent impurities from accumulating and concentrating in the steam generator, a part of the secondary water is blown down and discharged from the steam generator. Discarded or collected directly in the condenser.
[0003]
On the other hand, the steam generator of a nuclear power generation facility has a structure in which secondary water exists outside the heat exchange tube of primary water. In the secondary water circulation system, iron components in the equipment piping are eluted by erosion and corrosion, and scaled to the throttle and stagnation 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 demineralizer) to bring the fluid to a high pH (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 operating the secondary water circulation system fluid at high pH, the ammonia concentration on the inlet side of the condensate demineralizer becomes high, and a condensate demineralizer with an excessive impurity treatment capacity is required. . Therefore, in a nuclear power generation facility that operates fluid at a high pH, a bypass passage that bypasses the condensate demineralizer is provided, and when the fluid is operated at a high pH, the fluid is bypassed to the bypass passage, It is necessary not to let it pass.
[0005]
[Problems to be solved by the invention]
In conventional nuclear power generation facilities, when the secondary system fluid is operated at a high pH, the fluid after the steam generator fluid is blown down and recovered by the condenser bypasses the condensate demineralizer. become. For this reason, the impurities cannot be sufficiently removed. Impurity removal means may be installed in the blowdown fluid system from the steam generator, and it may be possible to remove impurities in the fluid after blowdown before recovery by the condenser. Need to be done, leading to a significant cost increase. Further, since the blown down fluid is recovered in the condenser at a high temperature, there is sufficient room for improvement in terms of heat recovery efficiency.
[0006]
The present invention has been made in view of the above situation, and can provide a nuclear power generation facility that can remove impurities in a blowdown fluid from a steam generator without increasing costs and that is excellent in heat recovery efficiency. With the goal.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the configuration of the present invention includes 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 drive source, and condensing exhaust steam from the steam turbine. The condenser, the condensate system for introducing the condenser fluid into the steam generator, the condensate demineralizer provided in the condensate system for removing impurities from the fluid, and the condensate provided in the condensate system. A bypass system for bypassing the desalination device,
Fluid that circulates and circulates from the steam generator to the steam turbine, condenser, and condensate system Put ammonia into the fluid When operating at high pH, circulate the fluid to the bypass system,
A part of the steam generator fluid is blown down and discharged, and a discharge system is provided to discharge the blown down fluid into the condensate demineralizer without passing through the bypass system to cool the condensate system fluid. A heat exchanging means for cooling the blowdown fluid as a medium is provided in the discharge system, and a heating means is provided in the condensate system between the inlet and outlet passages with respect to the heat exchanging means.
[0010]
In order to achieve the above object, the configuration of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and exhaust steam from the steam turbine. A condenser for condensing, a condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a condensate system. A bypass system for bypassing the condensate demineralizer,
In order to circulate the fluid from the steam generator to the steam turbine, condenser, and condensate system, and to circulate the fluid to prevent elution of iron components etc. in the equipment piping. A When the fluid is operated at a high pH after being introduced, the fluid is circulated to the bypass system to eliminate the water flow to the condensate demineralizer, and when the fluid is not operated at a high pH at the time of start-up, the fluid is recovered. All the water is passed through the water desalination unit,
When operating the fluid at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is introduced into the condensate demineralizer without passing through the bypass system and blown down. A drainage system that removes impurities from the fluid is provided, and the blowdown fluid in the condensate system is used as a cooling medium to cool the blowdown fluid in the drainage system. A heat exchanging means for lowering is provided in the discharge system, and heating means for heating the fluid of the condensate system is provided in a plurality of stages in the condensate system between the inlet / outlet flow paths with respect to the heat exchange means.
[0011]
In order to achieve the above object, the configuration of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and exhaust steam from the steam turbine. A condenser for condensing, a condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a condensate system. A bypass system for bypassing the condensate demineralizer,
Fluid that circulates and circulates from the steam generator to the steam turbine, condenser, and condensate system Put ammonia into the fluid When operating at high pH, circulate the fluid to the bypass system,
A part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is drained and desalted without passing through the bypass system. Throw A cooling means for cooling the blowdown fluid by providing a plurality of flash tanks connected in series to the discharge system, and providing a mist separator in the flash tank of the cooling means, Depending on the pressure, multiple stages of heating means are provided in the condensate system, Depending on the pressure of steam in each flash tank Heating means It is characterized in that an input system is provided for each.
[0012]
In order to achieve the above object, the configuration of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and exhaust steam from the steam turbine. A condenser for condensing, a condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a condensate system. A bypass system for bypassing the condensate demineralizer,
When fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system, ammonia is circulated to prevent the elution of iron components etc. in the equipment piping. A When the fluid is operated at a high pH after being introduced, the fluid is circulated to the bypass system to eliminate the water flow to the condensate demineralizer, and when the fluid is not operated at a high pH at the time of start-up, the fluid is recovered. All the water is passed through the water desalination unit,
When operating the fluid at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is introduced into the condensate demineralizer without passing through the bypass system and blown down. Discharge system that removes impurities from the fluid 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 the ion exchange resin heat resistance temperature of the condensate demineralizer The cooling means for lowering the temperature of the blowdown fluid is provided below, while the mist separator is provided in the flash tank of the cooling means, Provide multiple stages of heating means according to pressure in the condensate system, Depending on the pressure of steam in each flash tank Heating means It is characterized in that an input system is provided for each.
[0013]
The condensate demineralization apparatus includes a plurality of demineralization towers arranged in parallel, one inlet line for sending fluid to the plurality of demineralization towers, and water exchanged from the plurality of demineralization towers and subjected to ion exchange. A single outlet line for discharging the fluid; the inlet line and the outlet line are connected by a recirculation path; and a pump for pumping the fluid on the outlet line side to the inlet line is provided in the recirculation path. It is characterized by. In addition, a branch passage branching from a flow path from a plurality of demineralization towers to one outlet line is provided, and the branch passage communicates with the condenser side by one recovery line, and the recovery line and the inlet line are connected to each other. A circulation pump communicated with the circulation path and provided with a circulation pump for pumping the fluid on the recovery line side to the inlet line is provided in the recirculation path. The condensate demineralizer also operates at a high pH to circulate the fluid through the recirculation system, ensuring the minimum flow rate of multiple desalting towers when blowdown fluid is sent to a single inlet line. In order to achieve this, the pump is driven to pump the fluid on the outlet line side to the inlet line.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the overall configuration of the nuclear power generation facility according to the first embodiment of the present invention, and FIG. 2 shows the detailed configuration of the condensate demineralizer.
[0017]
As shown in FIG. 1, in a nuclear power generation facility, primary water (pressurized water) is heated by heat generated in a nuclear reactor 1 and sent to a steam generator 2. As a result, the secondary water is converted into steam and sent to the steam turbine 3 as driving means, and the steam turbine 3 is driven to operate the generator 3a. The exhaust steam from the steam turbine 3 is sent to the condenser 4, cooled by seawater or the like and condensed, and the water condensed in the condenser 4 is supplied to the steam generator 2 from the condensate system 5. It has become. The condensate system 5 includes a condensate pump 6, a condensate demineralizer 7, a condensate booster pump 8, a low-pressure feed water heater 9, and a deaerator 10 in order from the upstream side. The low-pressure feed water heater 9 may be configured by arranging two to five heaters in series.
[0018]
The condensate demineralizer 7 is provided with a bypass path 12 as a bypass system that bypasses the condensate demineralizer 7. A first valve device 13 is provided on the upstream side of the condensate demineralizer 7 downstream of the flow path on the proximal 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 side through the bypass 12. Conversely, by opening the first valve device 13 and closing the second valve device 14, the fluid from the condenser 4 is passed through the condensate demineralizer 7 and sent to the steam generator 2 side.
[0019]
In the nuclear power generation facility described above, a secondary system circulates from the steam generator 2 to the steam turbine 3, the condenser 4, and the condensate system 5 to construct a circulation system. Since the steam generator 2 has a structure in which the secondary water exists outside the heat exchange tube for the primary water, the flow outside the heat exchange tube for the primary water in the steam generator 2. Therefore, it is necessary to prevent the scale from accumulating in the squeezed part and the stagnant part. For this reason, in the secondary fluid circulation system, ammonia or the like is introduced into the condensate system 5 on the downstream side of the condensate demineralizer 7 so that iron components and the like in the equipment pipes are not eluted by erosion and corrosion. Thus, the fluid can be operated at a 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.
[0020]
When ammonia or the like is introduced into the condensate system 5 and operated at a high pH, the fluid from the condenser 4 is closed by closing the first valve device 13 of the condensate demineralizer 7 and opening the second valve device 14. When the water is not passed to the condensate demineralizer 7 through the bypass 12 and is not operated at a high pH such as at the time of start-up, the first valve device 13 and the second valve device 14 are closed, The entire amount of fluid from the condenser 4 is passed through the condensate demineralizer 7.
[0021]
On the other hand, in the nuclear power generation facility, in order to prevent impurities from accumulating and concentrating in the steam generator 2, a part of secondary water is blown down and discharged from the steam generator 2, and blown down. The fluid is collected in the condensate system 5. That is, the steam generator 2 and the condensate system 5 between the first valve device 13 and the condensate demineralizer 7 (upstream of the condensate demineralizer 7 and downstream of the bypass system branch) A system 15 is constructed, and a fluid obtained by blowing down a part of the secondary water is input to the condensate system 5 by the discharge system 15.
[0022]
When operating at a high pH, even if the fluid from the condenser 4 is passed through the bypass 12 and the water to the condensate demineralizer 7 is eliminated, the fluid obtained by blowing down a part of the secondary water is used. Water can be passed through the drainage system 15 to the condensate demineralizer 7. For this reason, 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 fluid that has been blown down.
[0023]
The discharge system 15 is provided with a flash tank 21, 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. In the mist separator 22, the fluid returned to the flash tank 21 and the steam are separated, and the separated steam is sent to the deaerator 10. The discharge system 15 downstream of the flash tank 21 is provided with cooling means 16, and the blowdown fluid discharged from the steam generator 2 by the cooling means 16 is the ion-exchange resin heat resistant temperature (for example, 40 degrees) of the condensate demineralizer 7. ) Cooled to: Reference numeral 23 in the figure denotes a supply pump provided in the discharge system 15. The supply pump 23 may not be installed. Reference numeral 24 in the figure denotes a switching valve that is operated when a part of blown-down secondary water is directly sent to the condenser 4.
[0024]
The cooling means 16 includes heat exchangers 17 and 18 as heat exchange means, and the heat exchangers 17 and 18 use the fluid of the condensate system 5 as a cooling medium. That is, an extraction line 20 is provided on the upstream side of the low-pressure feed water heater 9 in the condensate system 5, and the extraction line 20 passes through the heat exchangers 18 and 17, and the condensate system on the downstream side of the low-pressure feed water heater 9. 5 is joined. In addition, the heat exchanger as a heat exchange means may be one or a plurality of three or more. Further, a heat exchanger 19 as heat exchange means is provided downstream of the supply pump 23, and the heat exchanger 19 uses seawater (or steam cooling water of a steam turbine) as a cooling medium. The heat exchanger 19 may not be installed.
[0025]
The condensate demineralizer 7 is demonstrated based on FIG. As shown in the figure, the condensate demineralizer 7 is provided with six demineralization towers 31 in parallel, and one inlet for sending fluid from the condenser 4 and the discharge system 15 to the six demineralization towers 31. A line 32 is provided. The desalting tower 31 is filled with an ion exchange resin, and removes impurities from the fluid by ion exchange. The number of desalting towers 31 is not limited to six as long as it is a plurality of two or more. From one inlet line 32, fluid from the condenser 4 and the discharge system 15 is sent to each demineralization tower 31 via an inlet valve 33. From the six desalting towers 31, the water after passing through the outlet passage 35 through one outlet line 35 through the outlet valve 34 and being ion-exchanged is sent, and the outlet line 36 communicates with the condensate system 5. is doing.
[0026]
The outlet line 36 and the inlet line 32 communicate with each other through a recirculation path 41, and the recirculation path 41 is provided with a recycle pump 42 that pumps the fluid on the outlet line 36 side to the inlet line 32. In the desalting tower 31, a minimum flow rate of the fluid is set in order to ensure the impurity processing capacity. When operating at a high pH, the fluid from the condenser 4 is passed through the bypass 12 to eliminate the passage of water to the condensate demineralizer 7, and the blowdown fluid from the discharge system 15 is passed to the condensate demineralizer 7. When sent, since the blowdown fluid is about 1% to 3% of the total flow rate, the minimum flow rate of the fluid in the desalting tower 31 (flow rate for securing the processing capability) cannot be secured. For this reason, when only the blowdown fluid is sent to the condensate demineralizer 7, the recycle pump 42 is driven until the flow rate is secured, and the necessary fluid in the system of the six demineralizers 31 is obtained. The flow rate is secured.
[0027]
Further, when operating at a high pH, the fluid from the condenser 4 is passed through the bypass passage 12 to eliminate the passage of water to the condensate demineralizer 7, and the blowdown fluid discharged from the steam generator 2 is removed from the system. When the condenser 4 leaks during operation, it is necessary to pass the fluid from the condenser 4 to the condensate demineralizer 7. In this case, since the fluid from the condenser 4 is rapidly passed through the condensate demineralizer 7, the quality of the outlet water of the condensate demineralizer 7 is temporarily deteriorated. In order to prevent this temporary deterioration of water quality, when the fluid from the condenser 4 is passed through the bypass 12 when operating at a high pH, the recycle pump 42 is driven to provide six demineralizers. A necessary fluid flow rate is secured in the system 31.
[0028]
Although it is conceivable to allow only a part of the desalting tower 31 to pass the fluid, the deterioration of the part of the desalting tower 31 progresses and the frequency of the regeneration capacity recovery work increases, and the overall capacity is reduced. It will be inferior.
[0029]
On the other hand, a branch passage 37 is branched from the upstream side of the outlet valve 34 of each outlet passage 35, and the branch passage 37 communicates with one recovery passage 39 connected to the condenser 4 side via the branch valve 38. ing. The recovery path 39 and the inlet line 32 are communicated by a circulation path 40, and the circulation path 40 is provided with a circulation pump 43 that pumps the fluid on the recovery path 39 side to the inlet line 32. The desired inlet valve 33 is opened, the desired outlet valve 34 is closed, the desired branch valve 38 is opened, and the circulation pump 43 is driven to pass the fluid from the inlet line 32 to the desired desalting tower 31. And circulate in the condenser 4.
[0030]
This can be done, for example, during an operation in which only the deteriorated demineralizer 31 is stopped and the ion exchange capacity recovery operation (ion exchange resin regeneration operation) is performed individually, or the minimum flow rate (processing capacity) of the demineralizer 31 Operation for circulating water until the ion exchange capacity is stabilized after the ion exchange capacity recovery operation of the desalting tower 31 is performed individually or all at the same time. Applies to time etc. In addition to this, the condensate demineralizer 7 is controlled by controlling the opening / 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. Various water flow modes such as partial water flow and total water flow can be appropriately selected according to the situation.
[0031]
The condensate demineralizer 7 having the above-described configuration is used not only for nuclear power generation equipment to which fluid from the condenser 4 and the discharge system 15 is sent, but also for processing impurities in the blowdown fluid and fluid from the condenser 4. It can be applied to other than the nuclear power generation facility shown in FIG. In addition, although the recycle pump 42 and the circulation pump 43 are provided independently, the recycle pump 42 (circulation pump 43) may be a jet pump that uses the fluid discharged from the circulation pump 43 (recycle pump 42) as a drive source. is there.
[0032]
In the nuclear power generation facility configured as described above, in the secondary fluid circulation system, in the condensate system 5 on the downstream side of the condensate demineralizer 7, the erosion / corrosion does not elute iron components in the equipment piping. Ammonia or the like is introduced to operate the fluid at a high pH (for example, pH 9.8 to pH 10.0). When ammonia or the like is introduced into the condensate system 5 and the fluid is operated at a high pH, the ammonia concentration of the fluid at the outlet side of the condenser 4 increases, and the impurity treatment capacity of the condensate demineralizer 7 is exceeded. Resulting in. For this reason, when the secondary fluid is operated at a high pH, the fluid from the condenser 4 is bypassed by closing the first valve device 13 of the condensate demineralizer 7 and opening the second valve device 14. The passage of water through the passage 12 to the condensate demineralizer 7 is eliminated. Thereby, the impurity treatment capability in the condensate demineralizer 7 is ensured.
[0033]
On the other hand, in order to prevent impurities from accumulating and concentrating in the steam generator 2, a part of the secondary water is blown down and discharged from the steam generator 2, and the blown down fluid is discharged from the discharge system 15. Is then fed into the condensate demineralizer 7 and recovered in the condensate system 5. At this time, only a partial blowdown fluid of the secondary fluid is sent to the condensate demineralizer 7, and the desalting tower 31 of the condensate demineralizer 7 has a minimum flow rate for maintaining the processing capacity. Is not secured. Therefore, the inlet valve 33 and the outlet valve 34 are opened and the branch valve 38 is closed and the recycle pump 42 is driven until the flow rate for maintaining the processing capacity of the desalting tower 31 is secured, and the six desalting towers 31 are driven. The necessary fluid flow rate is secured 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 demineralizer 7, and impurities can be sufficiently removed.
[0034]
In addition, 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 demineralizer 7, and the ion exchange of the condensate demineralizer 7 Deterioration of the resin can be prevented. Moreover, since the cooling means 16 are heat exchangers 17 and 18 that exchange heat with the fluid of the condensate system 5, heat recovery of the blown down fluid can be performed effectively.
[0035]
A nuclear power generation facility according to a second embodiment of the present invention will be described. FIG. 3 shows the overall configuration of the nuclear power generation facility according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same thing as the structure shown in FIG. The nuclear power generation facility shown in FIG. 3 is different from the nuclear power generation facility shown in FIG. 1 in the configuration of a discharge system that inputs a fluid obtained by blowing down a portion of secondary water into the condensate system 5.
[0036]
As shown in the figure, in the nuclear power generation facility, the secondary water is converted into steam by the steam generator 2 by the heat of the primary water in the reactor 1, and the steam turbine 3 is driven by the steam to generate the generator 3a. Is activated. The exhaust steam from the steam turbine 3 is sent to the condenser 4 to be condensed, and the water condensed by the condenser 4 is supplied from the condenser system 5 to the steam generator 2. The condensate system 5 includes a condensate pump 6, a condensate demineralizer 7, a condensate booster pump 8, a low-pressure feed water heater 9, and a deaerator 10 in order from the upstream side. The low-pressure feed water heater 9 has four stages of heaters 9a, 9b, 9c, 9 arranged in series.
[0037]
The condensate demineralizer 7 is provided with a bypass path 12 as a bypass system that bypasses the condensate demineralizer 7. A first valve device 13 is provided on the upstream side of the condensate demineralizer 7 downstream of the flow path on the proximal 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 side through the bypass 12. Conversely, by opening the first valve device 13 and closing the second valve device 14, the fluid from the condenser 4 is passed through the condensate demineralizer 7 and sent to the steam generator 2 side.
[0038]
In the nuclear power generation facility described above, a secondary system circulates from the steam generator 2 to the steam turbine 3, the condenser 4, and the condensate system 5 to construct a circulation system. Since the steam generator 2 has a structure in which the secondary water exists outside the heat exchange tube for the primary water, the flow outside the heat exchange tube for the primary water in the steam generator 2. Therefore, it is necessary to prevent the scale from accumulating in the throttle part and the stagnation part. For this reason, in the secondary fluid circulation system, ammonia or the like is introduced into the condensate system 5 on the downstream side of the condensate demineralizer 7 so that iron components and the like in the equipment pipes are not eluted by erosion and corrosion. Thus, the fluid can be operated at a high 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 the carbon steel in the secondary fluid circulation system is suppressed.
[0039]
When ammonia or the like is introduced into the condensate system 5 and operated at a high pH, the fluid from the condenser 4 is closed by closing the first valve device 13 of the condensate demineralizer 7 and opening the second valve device 14. When the water is not passed through the bypass passage 12 to the condensate demineralizer 7 and is not operated at a high pH such as at the time of start-up, the first valve device 13 is opened and the second valve device 14 is closed. All the fluid from the vessel 4 is passed through the condensate demineralizer 7.
[0040]
On the other hand, in the nuclear power generation facility, in order to prevent impurities from accumulating and concentrating in the steam generator 2, a part of secondary water is blown down and discharged from the steam generator 2, and blown down. The fluid is collected in the condensate system 5. That is, the steam generator 2 and the condensate system 5 between the first valve device 13 and the condensate demineralizer 7 (upstream of the condensate demineralizer 7 and downstream of the bypass system branch) A system 51 is constructed, and a fluid obtained by blowing down a part of the secondary water is input to the condensate system 5 by the discharge system 51.
[0041]
When operating at a high pH, even if the fluid from the condenser 4 is passed through the bypass 12 and the water to the condensate demineralizer 7 is eliminated, the fluid obtained by blowing down a part of the secondary water is used. Water can be passed to the condensate demineralizer 7 by the discharge system 51. For this reason, 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 fluid that has been blown down.
[0042]
The discharge system 51 is provided with a flash tank 21 that constitutes a part of the cooling means 52, and a part of the 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. In the mist separator 22, the fluid returned to the flash tank 21 and the steam are separated, and the separated steam is sent to the deaerator 10. By providing the flash tank 21 with the mist separator 22, the tank capacity of the flash tank 21 can be reduced.
[0043]
The discharge system 51 downstream of the flash tank 21 is provided with a cooling means 52, and the blowdown fluid discharged from the steam generator 2 by the cooling means 52 is the heat resistant temperature of the ion exchange resin of the condensate demineralizer 7 (for example, 40 Degrees) to be cooled below. Reference numeral 23 in the figure 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, and the heat exchanger 19 uses seawater (or steam cooling water of a steam turbine) as a cooling medium.
[0044]
The cooling means 52 is configured by connecting a first flash tank 53, a second flash tank 54, a third flash tank 55, and a fourth flash tank 56 in series, and the liquid separated from the air in the flash tank 21 is the first. The liquid that has been charged into the flash tank 53 and separated from the water in the first flash tank 53 is charged into the second flash tank 54, and the liquid that has been separated from water in the second flash tank 54 is charged into the third flash tank 55. The liquid separated in the third flash tank 55 is supplied to the fourth flash tank 56, and the liquid separated in the fourth flash tank 56 is recovered by the supply pump 23 through the heat exchanger 19. It is sent to the water system 5. The cooling means 52 is configured by the first flash tank 53, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56. However, depending on the type of equipment, two or more arbitrary numbers of flash tanks may be used. It is also possible to constitute the cooling means 52.
[0045]
The gas (steam) separated in the first flash tank 53 is introduced into the heater 9d of the low-pressure feed water heater 9 through the introduction path 53a as the introduction system, and the gas separated in the second flash tank 54 is separated from the atmosphere. (Steam) is introduced into the heater 9c of the low-pressure feed water heater 9 through a feed path 54b as a feed system, and the gas (steam) separated by steam in the third flash tank 55 is the heater 9b of the low-pressure feed water heater 9. Further, the gas (steam) separated from the water by the fourth flash tank 56 is supplied to the heater 9a of the low-pressure feed water heater 9 via the input path 56d as the input system. Is inserted. That is, the vapors of the first flash tank 53, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56 are respectively input to the low-pressure feed water heater 9 corresponding to the pressure. The number of flash tanks and the number of heaters are the same, but steam from a plurality of flash tanks is added to the heater of one low-pressure feed water heater, or steam is sent from one flash tank to a plurality of low-pressure feed water heaters. Various changes are possible, such as charging.
[0046]
Since the condensate demineralizer 7 has the same configuration as the nuclear power generation facility of the first embodiment shown in FIG. 1, the details are as shown in FIG. For this reason, detailed description is omitted here.
[0047]
In the nuclear power generation facility configured as described above, in the secondary fluid circulation system, in the condensate system 5 on the downstream side of the condensate demineralizer 7, the erosion / corrosion does not elute iron components in the equipment piping. Ammonia or the like is introduced to operate the fluid at a high pH (for example, pH 9.8 to pH 10.0). When ammonia or the like is introduced into the condensate system 5 and the fluid is operated at a high pH, the ammonia concentration of the fluid at the outlet side of the condenser 4 increases, and the impurity treatment capacity of the condensate demineralizer 7 is exceeded. Resulting in. For this reason, when the secondary fluid is operated at high pH, the fluid from the condenser 4 is bypassed by closing the first valve device 13 and opening the second valve device 14 of the condensate demineralizer 7. The passage of water through the passage 12 to the condensate demineralizer 7 is eliminated. Thereby, the impurity treatment capability in the condensate demineralizer 7 is ensured.
[0048]
On the other hand, in order to prevent impurities from accumulating and concentrating in the steam generator 2, a part of the secondary water is blown down and discharged from the steam generator 2, and the blown down fluid is discharged from the discharge system 51. Is then fed into the condensate demineralizer 7 and recovered in the condensate system 5. At this time, only a partial blowdown fluid of the secondary fluid is sent to the condensate demineralizer 7, and the desalting tower 31 (see FIG. 2) of the condensate demineralizer 7 maintains its processing capacity. In this state, the minimum flow rate is not secured. Therefore, the recycle pump 42 (see FIG. 2) is driven until the flow rate that maintains the processing capacity of the desalting tower 31 (see FIG. 2) is secured, so that the six desalting towers 31 (see FIG. 2) are driven. The necessary fluid flow rate is secured 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 demineralizer 7, and impurities can be sufficiently removed.
[0049]
In addition, the fluid blown down by the cooling means 52 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 is sequentially separated and cooled. Therefore, the temperature of the fluid can be kept below the heat resistance temperature of the ion exchange resin of the condensate demineralizer 7, and the deterioration of the ion exchange resin of the condensate demineralizer 7 can be prevented. In addition, since the steam separated in the first flash tank 53, the second flash tank 54, the third flash tank 55, and the fourth flash tank 56 is sequentially introduced into the low-pressure feed water heater 9 according to the pressure. The heat recovery of the blown down fluid can be performed effectively.
[0053]
【The invention's effect】
The nuclear power generation facility of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, a condenser that condenses exhaust steam from the steam turbine, , A condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system for removing impurities of the fluid, and a condensate demineralizer provided in the condensate system bypassing Fluid that circulates and circulates fluid from the steam generator to the steam turbine, condenser, and condensate system. Put ammonia into the fluid When operating at a high pH, the fluid is circulated to the bypass system, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is drained without passing through the bypass system. A discharge system to be introduced into the salt device is provided, a heat exchange means for cooling the blowdown fluid using the condensate system fluid as a cooling medium is provided in the discharge system, and a heating means is provided in the condensate system between the inlet and outlet passages to the heat exchange means. Therefore, it is possible to pass the fluid blown down to the condensate demineralizer while maintaining the ion-exchange resin heat resistance temperature or lower of the condensate demineralizer below the condensate demineralizer without providing a dedicated treatment device. At the same time, the ion exchange resin of the condensate demineralizer can be prevented from being deteriorated to sufficiently remove impurities. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing costs, and a nuclear power generation facility with excellent plant efficiency can be obtained.
[0054]
Further, the nuclear power generation facility of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and condensate that condenses exhaust steam from the steam turbine. , A condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system for removing impurities of the fluid, and a condensate demineralizer provided in the condensate system A bypass system that bypasses the steam, and circulates the fluid from the steam generator to the steam turbine, condenser, and condensate system and prevents the fluid to circulate in order to prevent elution of iron components and the like in the equipment piping. A When the fluid is operated at a high pH after being introduced, the fluid is circulated to the bypass system to eliminate the water flow to the condensate demineralizer, and when the fluid is not operated at a high pH at the time of start-up, the fluid is recovered. When all the water is passed through the water desalination unit and the fluid is operated at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is recovered without passing through the bypass system. Put into water desalination equipment T A drain system that removes impurities from the low-down fluid is provided, and the blow-down fluid temperature falls below the ion-exchange resin heat resistance temperature of the condensate demineralizer by cooling the blow-down fluid in the drain system using the condensate fluid as a cooling medium. The heat exchanging means for reducing the temperature is provided in the discharge system, and the heating means for heating the fluid of the condensate system is provided in a plurality of stages in the condensate system between the inlet and outlet passages to the heat exchanging means. Without being blown down, the fluid can be passed through the condensate demineralizer while keeping it below the heat resistance temperature of the condensate demineralizer, improving the heat recovery efficiency and ion exchange of the condensate demineralizer. It is possible to prevent the resin from being deteriorated and sufficiently remove impurities. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing costs, and a nuclear power generation facility with excellent plant efficiency can be obtained.
[0055]
Further, the nuclear power generation facility of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and condensate that condenses exhaust steam from the steam turbine. , A condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system for removing impurities of the fluid, and a condensate demineralizer provided in the condensate system Fluid that circulates and circulates fluid from the steam generator to the steam turbine, condenser, and condensate system. Put ammonia into the fluid When operating at a high pH, the fluid is circulated to the bypass system, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is drained without passing through the bypass system. A cooling system for cooling the blowdown fluid is provided by providing a discharge system for charging the salt device, and 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 means, Depending on the pressure, multiple stages of heating means are provided in the condensate system, Depending on the pressure of steam in each flash tank Heating means Since the introduction system for each is provided, it is possible to pass the blowdown fluid through the condensate demineralizer while maintaining the ion exchange resin heat resistance temperature lower than the condensate demineralizer without using a dedicated treatment device. It is possible to increase the heat recovery efficiency and prevent the ion exchange resin of the condensate demineralizer from deteriorating and sufficiently remove impurities. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing costs, and a nuclear power generation facility with excellent plant efficiency can be obtained.
[0056]
Further, the nuclear power generation facility of the present invention includes a steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, and condensate that condenses exhaust steam from the steam turbine. , A condensate system for introducing the condenser fluid into the steam generator, a condensate demineralizer provided in the condensate system for removing impurities of the fluid, and a condensate demineralizer provided in the condensate system When circulating fluid from the steam generator to the steam turbine, condenser, and condensate system, the circulating fluid should be ammonia to prevent elution of iron components etc. in the equipment piping. A When the fluid is operated at a high pH after being introduced, the fluid is circulated to the bypass system to eliminate the water flow to the condensate demineralizer, and when the fluid is not operated at a high pH at the time of start-up, the fluid is recovered. When all the water is passed through the water desalination unit and the fluid is operated at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is recovered without passing through the bypass system. Put into water desalination equipment T A drain system that removes impurities from the low-down fluid is installed, and a plurality of flash tanks are connected in series to the drain system to cool the blow-down fluid in the drain system and heat-resistant the ion exchange resin of the condensate demineralizer. While providing a cooling means for lowering the temperature of the blowdown fluid below the temperature, while providing a mist separator in the flash tank of the cooling means, Provide multiple stages of heating means according to pressure in the condensate system, Depending on the pressure of steam in each flash tank Heating means Since the introduction system for each is provided, it is possible to pass the blowdown fluid through the condensate demineralizer while maintaining the ion exchange resin heat resistance temperature lower than the condensate demineralizer without using a dedicated treatment device. It is possible to increase the heat recovery efficiency and prevent the condensate demineralizer from being damaged, thereby sufficiently removing impurities. As a result, impurities in the blowdown fluid from the steam generator can be removed without increasing costs, and a nuclear power generation facility with excellent plant efficiency can be obtained.
[0057]
The condensate demineralization apparatus includes a plurality of demineralization towers arranged in parallel, one inlet line for sending fluid to the plurality of demineralization towers, and water exchanged from the plurality of demineralization towers and subjected to ion exchange. Since there is one outlet line through which the fluid is discharged, the inlet line and the outlet line are communicated with each other through the recirculation path, and a pump for pumping the fluid on the outlet line side to the inlet line is provided in the recirculation path. Even with a small amount of blowdown fluid, an effective flow rate of the desalting tower can be secured in the system. As a result, it can be easily applied to impurity treatment of blowdown fluid.
[0058]
The condensate demineralizer ensures the minimum flow rate of multiple desalting towers when the fluid is operated at a high pH to circulate the fluid to the bypass system and the blowdown fluid is sent to one inlet line. Therefore, since the pump is driven and the fluid on the outlet line side is pumped to the inlet line, an effective flow rate of the desalting tower can be secured in the system even with a small amount of blowdown fluid. As a result, it can be easily applied to impurity treatment of blowdown fluid.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a nuclear power generation facility according to a first embodiment of the present invention.
FIG. 2 is a detailed configuration diagram of a condensate demineralizer.
FIG. 3 is an overall configuration diagram of a nuclear power generation facility according to a second embodiment of the present invention.
[Explanation of symbols]
1 Reactor
2 Steam generator
3 Steam turbine
4 condenser
5 Condensate system
6 Condensate pump
7 Condensate demineralizer
8 Condensate booster pump
9 Low pressure water heater
10 Deaerator
12 Bypass
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 Demineralization tower
32 entrance line
33 Inlet valve
34 Outlet valve
35 Exit
36 Exit line
37 branch road
38 Branch valve
39 Collection path
40 Circuit
41 Recirculation path
42 Recycling pump
43 Circulation pump
51 Discharge system
52 Cooling means
53a, 54b, 55c, 56d
53 First flash tank
54 Second Flash Tank
55 3rd flash tank
56 4th flash tank

Claims (7)

A steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, a condenser that condenses the exhaust steam of the steam turbine, and steam from the condenser A condensate system to be introduced into the generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a bypass system provided in the condensate system and bypassing the condensate demineralizer,
When fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system and ammonia is added to the fluid to be circulated to operate the fluid at a high pH, the fluid is circulated to the bypass system,
A part of the steam generator fluid is blown down and discharged, and a discharge system is provided to discharge the blown down fluid into the condensate demineralizer without passing through the bypass system to cool the condensate system fluid. A nuclear power generation facility characterized in that a heat exchange means for cooling a blowdown fluid as a medium is provided in a discharge system, and a heating means is provided in a condensate system between an inlet / outlet flow path with respect to the heat exchange means. A steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, a condenser that condenses the exhaust steam of the steam turbine, and steam from the condenser A condensate system to be introduced into the generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a bypass system provided in the condensate system and bypassing the condensate demineralizer,
Steam turbine from the steam generator, condenser, was operated as a high pH fluid to the fluid by introducing ammonia to circulate for preventing the elution of iron components and the like in the equipment piping with circulating fluid condensate system In such a case, the fluid is circulated through the bypass system to eliminate water flow to the condensate demineralizer, and when the fluid is not operated at a high pH at the time of start-up or the like, the entire amount of fluid is allowed to pass through the condensate demineralizer,
When operating the fluid at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is introduced into the condensate demineralizer without passing through the bypass system and blown down. A drainage system that removes impurities from the fluid is provided, and the blowdown fluid in the condensate system is used as a cooling medium to cool the blowdown fluid in the drainage system. A nuclear power generation facility characterized in that a heat exchanging means for lowering is provided in a discharge system, and heating means for heating a fluid of the condensate system is provided in a condensate system between the inlet and outlet passages for the heat exchange means. A steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, a condenser that condenses the exhaust steam of the steam turbine, and steam from the condenser A condensate system to be introduced into the generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a bypass system provided in the condensate system and bypassing the condensate demineralizer,
When fluid is circulated from the steam generator to the steam turbine, condenser, and condensate system and ammonia is added to the fluid to be circulated to operate the fluid at a high pH, the fluid is circulated to the bypass system,
A part of the steam generator fluid is blown down and discharged, and a discharge system for supplying the discharged blowdown fluid to the condensate demineralizer without passing through the bypass system is provided. Are connected in series to form a cooling means for cooling the blowdown fluid, and a mist separator is provided in the flash tank of the cooling means, while a plurality of heating means are provided in the condensate system according to the pressure, A nuclear power generation facility provided with a charging system for charging the flash tank vapor to heating means corresponding to pressure. A steam generator that uses pressurized water on the reactor side as a heat source, a steam turbine that uses steam from the steam generator as a drive source, a condenser that condenses the exhaust steam of the steam turbine, and steam from the condenser A condensate system to be introduced into the generator, a condensate demineralizer provided in the condensate system to remove impurities in the fluid, and a bypass system provided in the condensate system and bypassing the condensate demineralizer,
Steam turbine from the steam generator, a condenser, when circulating fluid condensate systems, operating fluid by introducing ammonia into the fluid to circulate to prevent the elution of such an iron component in the equipment piping as high pH Circulate the fluid through the bypass system to eliminate the flow of water to the condensate demineralizer, and if the fluid is not operated at a high pH during startup, etc., allow the entire amount of fluid to pass through the condensate demineralizer. ,
When operating the fluid at a high pH, a part of the steam generator fluid is blown down and discharged, and the discharged blowdown fluid is introduced into the condensate demineralizer without passing through the bypass system and blown down. Discharge system that removes impurities from the fluid 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 the ion exchange resin heat resistance temperature of the condensate demineralizer The cooling means for lowering the temperature of the blow-down fluid is provided below, and the mist separator is provided in the flash tank of the cooling means, while the multistage heating means corresponding to the pressure is provided in the condensate system, and the steam in each flash tank is pressurized. A nuclear power generation facility characterized in that a charging system is provided for each heating means corresponding to the temperature.   5. The condensate demineralizer according to claim 1, wherein the condensate demineralizer includes a plurality of demineralization towers arranged in parallel, a single inlet line that sends fluid to the multiple demineralization towers, and a plurality of demineralization towers. And a single outlet line through which the fluid after being ion-exchanged through the salt tower is discharged. The inlet line and the outlet line communicate with each other through a recirculation path, and the fluid on the outlet line side is connected to the recirculation path. A nuclear power generation facility characterized in that a pump for pumping the gas to the inlet line is provided.   6. A branch path branched from a flow path from a plurality of demineralization towers to one outlet line is provided, respectively, and the branch path communicates with the condenser side by one recovery line, and the recovery line and the inlet A nuclear power generation facility, characterized in that a second pump is provided that communicates with a line through a circulation path and that pumps the fluid on the recovery line side to the inlet line.   The condensate demineralizer according to any one of claims 5 and 6, wherein the condensate demineralizer is operated at a high pH to circulate the fluid to the bypass system and the blowdown fluid is sent to one inlet line. A nuclear power plant characterized in that a pump is driven to pump the fluid on the outlet line side to the inlet line in order to ensure the minimum flow rate of the plurality of demineralization towers.

Images