Water treatment system for nuclear power plant

Abstract

A water treatment system (100) for a nuclear power plant, comprising a water intake system (3), a water production system (4), a water distribution system (5), and a dosing system (6). A water inlet of an SEI water tank (511) is connected to a water outlet of a reverse osmosis subsystem (43), a water outlet of the SEI water tank (511) is connected to a water inlet of an ion exchange treatment subsystem (44), and a water inlet of an SED water tank (521) and a water inlet of an SER water tank (531) are connected to a water outlet of the ion exchange treatment subsystem (44). An ultrafiltration subsystem (42), the reverse osmosis subsystem (43) and the ion exchange treatment subsystem (44) are integrated in the water production system (4). After part of industrial fresh water is provided to the SEI water tank (511), the other part of industrial fresh water enters the ion exchange treatment subsystem (44) again for further treatment. Industrial fresh water, neutral desalted water and alkaline desalted water sharing part of the treatment process can reduce redundant apparatus configuration for the production process of water of different grades, thereby reducing distributed and extra occupation of system apparatuses in plant areas.

Description

A water treatment system for nuclear power plant

[0001] The present application claims priority to the Chinese patent application No. 202411247540.X, filed on September 5, 2024 in the China Patent Office and entitled "A water treatment system for nuclear power plant", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of water treatment, in particular to a water treatment system for nuclear power plant. BACKGROUND

[0003] Water is an important carrier for energy transmission and conversion of nuclear power plant units, and is indispensable in the whole production and operation process of nuclear power plant.

[0004] Most of the industrial water required by nuclear power plants comes from nature, for example, water is directly taken from the sea or inland water source and then treated. The purified desalted water enters each system of the unit through different pipelines. For pressurized water reactor nuclear power units, in the primary circuit, water acts as a coolant and moderator and directly participates in the reaction of the reactor, which is the guarantee for the safe and stable operation of the nuclear power unit, and the water quality is strictly required in this process; in the secondary circuit, water is the source of steam and circulates in the steam turbine generator system to drive the generator to generate electricity; in the tertiary circuit, the main role of water is to cool the heat exchange equipment as the final heat sink, and in this process, water does not directly participate in the operation of the unit.

[0005] The existing water treatment system of nuclear power plant is mostly in a scattered state, and there are problems of dispersion and redundancy between each treatment system in the process. With the construction and expansion of the unit, there are more and more repeated treatment systems. Not only does it lead to a large and scattered land occupation, which is not conducive to the overall planning of the space in the power plant, but also the repeated systems need to be maintained and managed, which requires a large amount of manpower and material resources, and may also lead to the problem of different water quality provided. TECHNICAL PROBLEM

[0006] The purpose of the embodiments of the present application is to provide a water treatment system for nuclear power plant, which aims to solve the technical problems of the existing nuclear power plant water treatment, such as repeated modules occupying a large and scattered land area, being not conducive to the space planning of the power plant, and requiring a large amount of manpower for maintenance. TECHNICAL SOLUTION

[0007] The embodiments of the present application are implemented in such a way that a water treatment system for nuclear power plant comprises:

[0008] A water taking system, a water taking port of the water taking system is used to take water from the sea;

[0009] The water system comprises a water taking system, an ultrafiltration subsystem and a reverse osmosis subsystem connected in sequence; the water inlet of the ultrafiltration subsystem is connected to the water outlet of the water taking system; and the water system further comprises an ion exchange treatment subsystem for removing cations and anions from desalinated water.

[0010] The water distribution system comprises an SEI subsystem, an SED subsystem and an SER subsystem; the SEI subsystem comprises an SEI water tank and an SEI distribution pipe network connected in sequence; the SED subsystem comprises an SED water tank and an SED distribution pipe network connected in sequence; and the SER subsystem comprises an SER water tank and an SER distribution pipe network connected in sequence; the water inlet of the SEI water tank is connected to the water outlet of the reverse osmosis subsystem; the water outlet of the SEI water tank is further connected to the water inlet of the ion exchange treatment subsystem; the water inlets of the SED water tank and the SER water tank are connected in parallel to the water outlet of the ion exchange treatment subsystem; and

[0011] The dosing system is connected to the water taking system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem and the water inlet of the SER water tank respectively, so as to provide medicaments to the water taking system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem and the SER water tank respectively.

[0012] In one embodiment, the dosing system comprises a plurality of medicament solution tanks, a plurality of second dosing pipelines and a plurality of third dosing pipelines; the first end of the second dosing pipeline is connected to the medicament solution tank, and the second end of the second dosing pipeline is connected to the ultrafiltration subsystem, so as to provide a plurality of medicaments to the ultrafiltration subsystem; the first end of the third dosing pipeline is connected to the medicament solution tank, and the second end of the third dosing pipeline is connected to the reverse osmosis subsystem, so as to provide a plurality of medicaments to the reverse osmosis subsystem; wherein each medicament solution tank corresponds to one medicament, and the second dosing pipeline and the third dosing pipeline for conveying the same medicament are partially shared.

[0013] In one embodiment, the reverse osmosis subsystem comprises a plurality of reverse osmosis devices connected in sequence; the first end of each third dosing pipeline is connected to the medicament solution tank, and the second end of each third dosing pipeline is connected to each reverse osmosis device; each third dosing pipeline is used for conveying one medicament to each reverse osmosis device, and the medicaments provided to each reverse osmosis device include a plurality of scale inhibitors, reducing agents, cleaning agents, acidic substances and alkaline substances.

[0014] In one embodiment, the ion exchange treatment subsystem comprises a cation exchanger, an anion exchanger and a mixed ion exchanger connected in sequence, and the dosing system further comprises a plurality of fourth dosing pipelines and a fifth dosing pipeline, the first ends of the fourth dosing pipelines and the first end of the fifth dosing pipeline are connected to the liquid outlet of the dosing solution tank, the second ends of the fourth dosing pipelines are connected to the cation exchanger and the mixed ion exchanger, and the second end of the fifth dosing pipeline is connected to the anion exchanger and the mixed ion exchanger.

[0015] In one embodiment, the water preparation system further comprises a pretreatment subsystem arranged between the water intake system and the ultrafiltration subsystem, and the dosing system further comprises a plurality of first dosing pipelines, the first ends of the first dosing pipelines are connected to the dosing solution tanks, and the second ends of the first dosing pipelines are connected to the pretreatment subsystem to provide bactericides, flocculants and coagulants to the pretreatment subsystem.

[0016] In one embodiment, a centralized control system is further included, liquid level sensors are arranged in the water intake system, the water preparation system, the SEI tank, the SED tank and the SER tank, control elements are arranged between the water intake system and the ultrafiltration subsystem, between the SEI tank and the SEI distribution pipeline network, between the SED tank and the SED distribution pipeline network, and between the SER tank and the SER distribution pipeline network, and the centralized control system is connected to the water intake system, the water preparation system, the liquid level sensors and the control elements to control the opening and closing of the water intake system, the water preparation system, the liquid level sensors and the control elements.

[0017] In one embodiment, the centralized control system, the water intake system, the water preparation system, and the dosing system are arranged around the water preparation system.

[0018] In one embodiment, the wastewater system further comprises a wastewater collection tank, a wastewater treatment tank and a recycled water tank connected in sequence, the wastewater inlets of the wastewater collection tank are connected to the wastewater outlets of the water preparation system and the nuclear power plant unit system, and the water outlets of the recycled water tank are connected to the water outlets of the SEI tank.

[0019] In one embodiment, the wastewater system, the water intake system and the water preparation system are arranged around the water preparation system.

[0020] In one embodiment, the water preparation system, the wastewater system and the water preparation system are arranged around the dosing system. Advantages

[0021] The nuclear power plant water treatment system provided by the embodiments of the present application has the following advantages:

[0022] The nuclear power plant water treatment system provided by the embodiments of the present application integrates an ultrafiltration subsystem, a reverse osmosis subsystem and an ion exchange treatment subsystem in the water making system, and after a part of the industrial fresh water is supplied to the SEI water tank, another part of the industrial fresh water enters the ion exchange treatment subsystem of the water making system again for further treatment, and finally neutral desalted water is obtained. The neutral desalted water is adjusted by chemical addition treatment to obtain alkaline desalted water. In this way, the industrial fresh water, the neutral desalted water and the alkaline desalted water share part of the treatment process, which can reduce the repeated configuration of equipment in the preparation process of different water, reduce the dispersion of repeated equipment in the plant area and the additional land occupation, is beneficial to the overall planning and utilization of the space in the plant area, reduces the human and material resources investment in the management of repeated modules, and reduces the production cost and management cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] FIG. 1 is a structural schematic diagram of a nuclear power plant water treatment system provided by an embodiment of the present application;

[0025] FIG. 2 is a layout schematic diagram of the nuclear power plant water treatment system in a plant area provided by an embodiment of the present application;

[0026] FIG. 3 is a configuration schematic diagram of a chemical addition system in the nuclear power plant water treatment system provided by an embodiment of the present application.

[0027] The meanings of the marks in the drawings are as follows:

[0028] 100 - nuclear power plant water treatment system;

[0029] 3 - water taking system, 31 - water taking pump, 32 - water storage pool;

[0030] 4 - water making system, 41 - pretreatment subsystem, 42 - ultrafiltration subsystem, 43 - reverse osmosis subsystem, 431 - reverse osmosis equipment, 44 - ion exchange treatment subsystem, 441 - cation exchanger, 442 - anion exchanger, 443 - mixed ion exchanger;

[0031] 5 - water distribution system, 51 - SEI subsystem, 511 - SEI water tank, 512 - SEI water pump, 513 - SEI distribution pipe network;

[0032] 52 - SED subsystem, 521 - SED water tank, 522 - SED water pump, 523 - SED distribution pipe network;

[0033] 53-SER subsystem, 531-SER water tank, 532-SER water pump, 533-SER distribution pipe network;

[0034] 6-dosing system, 61-dosing solution tank, 621-first dosing line, 622-second dosing line, 623-third dosing line, 624-fourth dosing line, 625-fifth dosing line, 626-sixth dosing line;

[0035] 7-centralized control system;

[0036] 8-wastewater system, 81-wastewater collection tank, 82-wastewater treatment tank, 83-reuse water tank;

[0037] 91-sea, 92-machine unit area, 93-arrangement space. Embodiments of the present application

[0038] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0039] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly fixed or disposed on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for convenience of description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present patent. The terms "first", "second" are only used for the purpose of convenience, and cannot be understood as indicating or implying relative importance or implying the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0040] In order to illustrate the technical solutions described in the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0041] In existing nuclear power plants, industrial water is divided into industrial fresh water, neutral desalted water, alkaline desalted water and other types according to different needs of the unit. Different types of water are provided to the conventional island and nuclear island of the unit through different distribution pipe networks. At present, industrial fresh water, neutral desalted water and alkaline desalted water are usually provided with separate water production paths, for example, one water production path is from seawater to industrial fresh water, and another water production path is from seawater to neutral desalted water. This leads to the repeated configuration of part of the water production process. Therefore, it occupies additional plant area, hinders the overall planning and utilization of the space in the plant, and the repeated systems need to be specially managed by manpower, increasing the cost of manpower and resources.

[0042] Referring to FIG. 1, the embodiment of the present application provides a nuclear power plant water treatment system 100, which is arranged in the plant area of the nuclear power plant, and specifically includes a water intake system 3, a water production system 4, a water distribution system 5 and a dosing system 6. The water intake port of the water intake system 3 is used to take water from the sea 91 and provide it to the water production system 4; the water production system 4 includes an ultrafiltration subsystem 42 and a reverse osmosis subsystem 43 connected in sequence, wherein the water inlet of the ultrafiltration subsystem 42 is connected to the water outlet of the water intake system 3; the water distribution system 5 includes an SEI subsystem 51, an SED subsystem 52 and an SER subsystem 53, the SEI subsystem 51 includes an SEI water tank 511 and an SEI distribution pipe network 513 connected in sequence, the SED subsystem 52 includes an SED water tank 521 and an SED distribution pipe network 523 connected in sequence, and the SER subsystem 53 includes an SER water tank 531 and an SER distribution pipe network 533 connected in sequence. Here, the SEI subsystem 51, the SED subsystem 52 and the SER subsystem 53 are three parallel and independent water distribution paths, which are provided to the users of the nuclear power plant, i.e. the unit, and the said users include the conventional island and the nuclear island; the water inlet of the SEI water tank 511 is connected to the water outlet of the reverse osmosis subsystem 43.

[0043] Referring to FIG. 1, in the embodiment of the present application, the water production system 4 further includes an ion exchange treatment subsystem 44 for replacing and removing cations and anions from desalted water, and the water outlet of the SEI water tank 511 is also connected to the water inlet of the ion exchange treatment subsystem 44. The water inlets of the SED water tank 521 and the SER water tank 531 are connected in parallel to the water outlet of the ion exchange treatment subsystem 44.

[0044] The dosing system 6 is connected to the water intake system 3, the water production system 4 and the water distribution system 5 respectively, and is used to provide various reagents required for water treatment in the water intake system 3, the ultrafiltration subsystem 42, the reverse osmosis subsystem 43, the ion exchange treatment subsystem 44 and the SER water tank 531.

[0045] It should be noted that the SEI is an industrial fresh water storage and distribution system, the SED is a neutral desalted water storage and distribution system, and the SER is an alkaline desalted water storage and distribution system.

[0046] The nuclear power plant water treatment system 100 provided by the embodiment of the present application works as follows:

[0047] The water taking system 3 takes water from the sea 91, and the seawater enters the water making system 4 and is filtered by the ultrafiltration subsystem 42 to remove suspended particles, impurities and microorganisms, etc. The seawater is treated by the reverse osmosis subsystem 43 to remove salt from the seawater and is converted into usable fresh water. At this time, the obtained water is industrial fresh water. The industrial fresh water can be stored in the SEI water tank 511, and a part of the industrial fresh water is distributed to the nuclear island and the conventional island through the SED distribution pipe network 523.

[0048] Another part of the industrial fresh water is treated by the ion exchange treatment subsystem 44 to remove heavy metal ions, harmful anions, calcium ions, magnesium ions and the like in the water, and neutral desalted water is obtained. Then, a part of the neutral desalted water enters the SED water tank 521, and is distributed to the nuclear island and the conventional island through the SED distribution pipe network 523.

[0049] Another part of the neutral desalted water enters the SER water tank 531, and the alkaline medicament is provided to the SER water tank 531 by the medicament adding system 6, so that the neutral desalted water becomes alkaline desalted water in the SER water tank 531. Then, the alkaline desalted water is distributed to the nuclear island and the conventional island through the SER distribution pipe network 533.

[0050] The nuclear power plant water treatment system 100 provided by the embodiment of the present application integrates the ultrafiltration subsystem 42, the reverse osmosis subsystem 43 and the ion exchange treatment subsystem 44 in the water making system 4. After a part of the industrial fresh water is provided to the SEI water tank 511, another part of the industrial fresh water enters the ion exchange treatment subsystem of the water making system 4 again for further treatment to obtain neutral desalted water. The neutral desalted water is adjusted by medicament adding to obtain alkaline desalted water. In this way, the industrial fresh water, the neutral desalted water and the alkaline desalted water share part of the treatment process, which can reduce the repeated arrangement of modules in the preparation process of different water, reduce the dispersion of repeated modules and additional land occupation in the plant, is beneficial to the overall planning and utilization of the space in the plant, reduces the human and material resources investment in the management of repeated modules, and reduces the production cost and management cost.

[0051] As shown in FIG. 1, the water taking system 3 can include a water taking pump 31 and a water storage pool 32. The seawater is temporarily stored in the water storage pool 32. The water in the water storage pool 32 enters the ultrafiltration subsystem 42 and the like for further treatment under the action of the water taking pump 31 and the like.

[0052] Referring to FIG. 1, in one embodiment, the water production system 4 further comprises a pretreatment subsystem 41 arranged upstream of the ultrafiltration subsystem 42, for pre-sterilizing, coagulating and precipitating seawater before the seawater enters the ultrafiltration subsystem 42, so as to reduce foreign matters, especially large-size foreign matters, entering the ultrafiltration subsystem 42, and improve the processing efficiency of the ultrafiltration subsystem 42.

[0053] The dosing system 6 can be connected to the pretreatment subsystem 41, so as to provide sterilizing agents, flocculants, coagulants and the like to the pretreatment subsystem 41.

[0054] As shown in FIG. 3, in one embodiment, the dosing system 6 comprises a plurality of dosing solution tanks 61, a first dosing pipeline 621, a second dosing pipeline 622 and a third dosing pipeline 623. The first end of the first dosing pipeline 621 is connected to the dosing solution tank 61, and the second end of the first dosing pipeline 621 is connected to the pretreatment subsystem 41, for providing sterilizing agents, flocculants, coagulants and the like to the pretreatment subsystem 41, so as to promote the aggregation of small particles and colloids in seawater to form larger flocs, thereby realizing solid-liquid separation, and preliminarily sterilizing the seawater. The first end of the second dosing pipeline 622 is connected to the dosing solution tank 61, and the second end of the second dosing pipeline 622 is connected to the ultrafiltration subsystem 42, for providing sterilizing agents, acidic substances and / or basic substances to the ultrafiltration subsystem 42, so as to further sterilize, and preliminarily adjust the pH value. The first end of the third dosing pipeline 623 is connected to the dosing solution tank 61, and the second end of the third dosing pipeline 623 is connected to the reverse osmosis subsystem 43, for providing scale inhibitors, reducing agents, cleaning agents, acidic substances and / or basic substances to the reverse osmosis subsystem 43, so as to further sterilize, further adjust the pH value, and ensure the continuous operation of the reverse osmosis subsystem 43.

[0055] It can be understood that, according to the types of specific medicaments, the number of the dosing solution tanks 61, the first dosing pipeline 621, the second dosing pipeline 622 and the third dosing pipeline 623 can be multiple. For example, one dosing solution tank 61 is arranged for each type of medicament, and pipelines for providing the same medicament can be partially shared. For example, the first dosing pipeline 621, the second dosing pipeline 622 and the third dosing pipeline 623 for providing sterilizing agents can be partially shared, the second dosing pipeline 622 and the third dosing pipeline 623 for providing acidic substances can be partially shared, and the second dosing pipeline 622 and the third dosing pipeline 623 for providing basic substances can be partially shared. The same applies to other cases, which will not be described one by one.

[0056] Referring to FIG. 3, in one embodiment, the reverse osmosis subsystem 43 includes a plurality of reverse osmosis devices 431 connected in series. Taking two reverse osmosis devices 431 as an example, they are a first-stage reverse osmosis device 431 and a second-stage reverse osmosis device 431. The third dosing line 623 has a first end connected to the dosing solution tank 61 and a second end connected to each reverse osmosis device 431, for providing scale inhibitors, reducing agents, cleaning agents, acidic substances, and alkaline substances to each reverse osmosis device 431.

[0057] In other alternative embodiments, there can be more reverse osmosis devices 431 connected in series.

[0058] Each dosing solution tank 61 is configured to store one type of agent, and each third dosing line 623 is configured to deliver one type of agent. For example, there are multiple third dosing lines 623, each of which is configured to deliver one type of agent. Multiple third dosing lines 623 that are configured to deliver the same type of agent can share a portion of the third dosing line 623. For example, two third dosing lines 623 that are configured to provide scale inhibitors from the dosing solution tank 61 storing scale inhibitors to the first-stage reverse osmosis device 431 and the second-stage reverse osmosis device 431 can share a portion of the third dosing line 623. Other configurations are also possible.

[0059] Referring to FIGS. 1 and 3, in one embodiment, the ion exchange treatment subsystem 44 includes a cation exchanger 441, an anion exchanger 442, and a mixed ion exchanger 443 connected in series, with the water inlet of the cation exchanger 441 connected to the water outlet of the SEI water tank 511. The dosing system 6 further includes a fourth dosing line 624 and a fifth dosing line 625, with the first ends of the fourth dosing line 624 and the fifth dosing line 625 connected to the liquid outlets of the dosing solution tanks 61, respectively, and the second ends of the fourth dosing line 624 and the fifth dosing line 625 connected to the cation exchanger 441, the mixed ion exchanger 443, the anion exchanger 442, and the mixed ion exchanger 443, respectively.

[0060] Through the fourth dosing line 624, the dosing system 6 can provide one type of agent, such as an acidic substance, for example, hydrochloric acid, to the cation exchanger 441 and the mixed ion exchanger 443, for regenerating the exhausted cation exchange resin and maintaining the function of the cation exchange resin in removing anions.

[0061] Through the fifth dosing pipeline 625, the dosing system 6 can provide another medicament, such as a basic substance, specifically sodium hydroxide, to the anion exchanger 442 and the mixed ion exchanger 443, to regenerate the exhausted anion exchange resin, so as to maintain the function of the anion exchange resin to remove cations.

[0062] Furthermore, the fourth dosing pipeline 624 simultaneously provides the acidic substance from one medicament solution tank 61 with the acidic substance to the cation exchanger 441 and the mixed ion exchanger 443, achieving partial pipeline sharing, and it is not necessary to configure a complex and redundant acidic substance providing pipeline for the cation exchanger 441 and the mixed ion exchanger 443, thus simplifying the pipeline structure and reducing the space occupation. Similarly, the fifth dosing pipeline 625 simultaneously provides the basic substance from one medicament solution tank 61 with the basic substance to the anion exchanger 442 and the mixed ion exchanger 443, achieving partial pipeline sharing, and it is not necessary to configure a complex and redundant basic substance providing pipeline for the anion exchanger 442 and the mixed ion exchanger 443, thus simplifying the pipeline structure and reducing the space occupation.

[0063] Please refer to FIG. 3, the dosing system 6 further includes a sixth dosing pipeline 626, the first end of the sixth dosing pipeline 626 is connected to one medicament solution tank 61, and the other end of the sixth dosing pipeline 626 is connected to the SER water tank 531, for providing the basic substance to the SER water tank 531. The basic substance here is preferably a basic substance without introducing other impurity metal ions, such as ammonia.

[0064] As shown in FIG. 1 and FIG. 2, in one embodiment, the nuclear power plant water treatment system 100 further includes a wastewater system 8, which includes a wastewater collection tank 81, a wastewater treatment tank 82, and a reused water tank 83 connected in sequence, the water inlets of the wastewater collection tank 81 are connected to the wastewater outlets of the water production system 4 and the wastewater outlets of each unit, and the water outlet of the reused water tank 83 is connected between the water outlet of the SEI water tank 511 and the water inlet of the ion exchange treatment subsystem 44. In this way, the wastewater obtained from the water production system 4 and each user enters the wastewater system 8, and after being treated, can return to the SEI water tank 511 again and be used and treated subsequently.

[0065] The wastewater outlets of the water production system 4 include the wastewater outlet of the ultrafiltration subsystem 42, the wastewater outlet of the reverse osmosis device 431, and the like.

[0066] As shown in FIG. 1 and FIG. 2, in one embodiment, the nuclear power plant water treatment system 100 further includes a centralized control system 7, which is connected to the water intake system 3, the water production system 4, the water distribution system 5, and the dosing system 6, for obtaining the working state information of the water intake system 3, the water production system 4, the water distribution system 5, and the dosing system 6, and controlling the working of the water intake system 3, the water production system 4, the water distribution system 5, and the dosing system 6.

[0067] Specifically, the water storage tank 32 of the water intake system 3 is provided with a liquid level sensor, and the water intake pump 31 and the liquid level sensor are in communication connection with the centralized control system 7. The liquid level sensor is used to provide the centralized control system 7 with the liquid level information in the water storage tank 32, and the centralized control system 7 controls the opening and closing of the water intake pump 31 according to the liquid level information.

[0068] Specifically, the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43 are each provided with a liquid level sensor, and the centralized control system 7 is connected to the liquid level sensors, so that the liquid level in the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43 can be kept within a normal range, thereby ensuring their normal operation and ensuring that the liquid level in the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43 matches the amount of reagent provided by the reagent adding system 6, and ensuring the water quality after each treatment.

[0069] Specifically, the water distribution system 5 is provided with liquid level sensors in the SEI water tank 511, the SED water tank 521 and the SER water tank 531. The SEI water tank 511 and the SEI distribution pipe network 513 are further provided with a SEI water pump 512, the SED water tank 521 and the SED distribution pipe network 523 are further provided with a SED water pump 522, and the SER water tank 531 and the SER distribution pipe network 533 are further provided with a SER water pump 532. The centralized control system 7 is connected to the liquid level sensors and control elements (referring to the SEI water pump 512, the SED water pump 522 and the SER water pump 532) for obtaining the liquid level signals of the liquid level sensors and controlling the opening and closing of the control elements.

[0070] At least one of the connection between the water intake system 3 and the pretreatment subsystem 41, the connection between the reverse osmosis subsystem 43 and the SEI water tank 511, the connection between the reverse osmosis subsystem 43 and the ion exchange treatment subsystem 44, the connection between the ion exchange treatment subsystem 44 and the SED water tank 521, and the connection between the ion exchange treatment subsystem 44 and the SER water tank 531 can be provided with a control element such as a control valve and / or a control pump. The centralized control system 7 is connected to each control valve and / or control pump to control the opening and closing of the control elements.

[0071] Specifically, the wastewater collection tank 81, the wastewater treatment tank 82 and the recycled water tank 83 are each provided with a liquid level sensor. The connection between the wastewater collection tank 81 and the wastewater treatment tank 82, and the connection between the wastewater treatment tank 82 and the recycled water tank 83 are provided with control elements such as control valves and / or control pumps. The centralized control system 7 is connected to the liquid level sensors and controls the opening and closing of each control valve and / or control pump to ensure that the wastewater collection tank 81, the wastewater treatment tank 82 and the recycled water tank 83 have appropriate liquid levels.

[0072] Referring to FIG. 2, in one embodiment, the nuclear power plant has one or more unit areas 92, and the unit areas 92 can be connected or have a certain distance. In actual cases, the unit areas 92 are usually spaced apart by a certain distance for roads or other supporting construction. The unit area 92 is provided with a layout space 93 on the side close to the sea 91, and the water treatment system 100 of the nuclear power plant in the embodiment is located in the layout space 93, that is, on the side of the unit area 92 facing the sea 91. This makes the water treatment system 100 of the nuclear power plant have the shortest processing path from the sea 91 to the unit, thereby facilitating the arrangement of each module and pipeline and simplifying the design.

[0073] Specifically, referring to the figure, the water production system 4 is located between the water intake system 3 and the water distribution system 5. This makes the path from the water intake system 3 to the water production system 4 and from the water production system 4 to the water distribution system 5 respectively have the shortest path. It can be understood that according to actual conditions, the area occupied by each module is not a regular rectangle, a circle, or the like, and the water production system 4 defined in the present application as being located between the water intake system 3 and the water distribution system 5 does not mean that the water intake system 3, the water production system 4, and the water distribution system 5 are located on a straight line, but it should be understood that the water intake system 3 is arranged as close to the sea 91 as possible, the water distribution system 5 is arranged as close to the unit area 92 as possible, the distance between the water production system 4 and the sea 91 should not be greater than the distance between the water intake system 3 and the sea 91, and the distance between the water production system 4 and the unit area 92 should not be greater than the distance between the water distribution system 5 and the unit area 92.

[0074] In one specific embodiment, referring to FIG. 2, the water intake system 3, the water distribution system 5, and the wastewater system 8 are distributed around the water production system 4. Of course, it is not limited here that the three are uniformly distributed around the water production system 4. The purpose of such arrangement is that since the water production system 4 is associated with the water intake system 3, the water distribution system 5, and the wastewater system 8, the water production system 4 is arranged generally in the middle, which can make the path from the water production system 4 to the water intake system 3, the water distribution system 5, and the wastewater system 8 achieve the shortest design as a whole.

[0075] In one embodiment, referring to FIG. 2, the centralized control system 7, the water intake system 3, the water distribution system 5, and the wastewater system 8 are distributed around the water production system 4. Of course, it is not limited here that the four are uniformly distributed around the water production system 4. The purpose of such arrangement is that since the water production system 4 is associated with the centralized control system 7, the water intake system 3, the water distribution system 5, and the wastewater system 8, the water production system 4 is arranged generally in the middle, which can make the path from the water production system 4 to the centralized control system 7, the water intake system 3, the water distribution system 5, and the wastewater system 8 achieve the shortest design as a whole.

[0076] In one embodiment, as shown in FIG. 2, the centralized control system 7, the water intake system 3, the water distribution system 5 and the chemical dosing system 6 are distributed around the water production system 4. Of course, it is not limited that the four are evenly distributed around the water production system 4. The purpose of such arrangement is that, since the water production system 4 is associated with the water intake system 3, the water distribution system 5 and the chemical dosing system 6, the water production system 4 is arranged generally in the middle, so that the paths from the water production system 4 to the centralized control system 7, the water intake system 3, the water distribution system 5 and the chemical dosing system 6 can be designed to be the shortest as a whole.

[0077] As shown in FIG. 2, in one embodiment, the chemical dosing system 6 is arranged between the water production system 4, the wastewater system 8 and the water distribution system 5. Of course, it is not limited that the three are evenly distributed around the chemical dosing system 6. The purpose of such arrangement is that, since the chemical dosing system 6 is associated with the water production system 4, the water distribution system 5 and the wastewater system 8, the chemical dosing system 6 is arranged generally in the middle, so that the paths from the chemical dosing system 6 to the water production system 4, the water distribution system 5 and the wastewater system 8 can be designed to be the shortest as a whole.

[0078] In one optional embodiment, the chemical dosing system 6 occupies a smaller area compared with other modules, in particular, the chemical dosing system 6 occupies a smaller area compared with the water production system 4, and the chemical dosing system 6 is more closely associated with the water production system 4. Therefore, the chemical dosing system 6 is arranged on the side of the water production system 4 close to the unit area 92. This makes the sum of the areas of the chemical dosing system 6, the wastewater system 8 and the water distribution system 5 close to the sum of the areas of the water production system 4 and the wastewater system 8, thereby facilitating the spatial arrangement of the five modules in the direction from the sea 91 to the unit area 92, and ensuring that the two adjacent modules associated with each other can have a shorter path design.

[0079] The above merely provides the preferred embodiments of the present application, but not for limiting the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall into the protection scope of the present application.

Claims

1. A water treatment system for a nuclear power plant, characterized in that, include: A water intake system, wherein the water intake of the water intake system is used to draw water from the ocean; The water production system includes an ultrafiltration subsystem and a reverse osmosis subsystem connected in sequence; the inlet of the ultrafiltration subsystem is connected to the outlet of the water intake system; it also includes an ion exchange treatment subsystem for replacing and removing cations and anions from the desalinated water; The water distribution system includes an SEI subsystem, a SED subsystem, and a SER subsystem. The SEI subsystem includes an SEI water tank and an SEI distribution network connected in sequence. The SED subsystem includes an SED water tank and an SED distribution network connected in sequence. The SER subsystem includes a SER water tank and a SER distribution network connected in sequence. The inlet of the SEI water tank is connected to the outlet of the reverse osmosis subsystem. The outlet of the SEI water tank is also connected to the inlet of the ion exchange treatment subsystem. The inlets of the SED water tank and the SER water tank are connected in parallel to the outlet of the ion exchange treatment subsystem. The dosing system is connected to the inlet of the water intake system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem, and the SER water tank, respectively, and is used to provide chemicals to the water intake system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem, and the SER water tank.

2. The nuclear power plant water treatment system as described in claim 1, characterized in that, The dosing system includes multiple dosing solution tanks, multiple second dosing lines, and multiple third dosing lines. The first end of each second dosing line is connected to a dosing solution tank, and the second end is connected to an ultrafiltration subsystem, for providing multiple reagents to the ultrafiltration subsystem. The first end of each third dosing line is connected to a dosing solution tank, and the second end is connected to a reverse osmosis subsystem, for providing multiple reagents to the reverse osmosis subsystem. Each dosing solution tank corresponds to one reagent, and the second and third dosing lines for delivering the same reagent are partially shared.

3. The nuclear power plant water treatment system as described in claim 2, characterized in that, The reverse osmosis subsystem includes multiple reverse osmosis devices connected in sequence; the first end of each third dosing line is connected to the dosing solution tank, and the second end of each third dosing line is connected to each of the reverse osmosis devices in multiple ways; each third dosing line is used to deliver a reagent to each of the reverse osmosis devices, and the reagent provided to each of the reverse osmosis devices includes multiple substances selected from scale inhibitors, reducing agents, cleaning agents, acidic substances, and alkaline substances.

4. The nuclear power plant water treatment system as described in claim 2, characterized in that, The ion exchange treatment subsystem includes a cation exchanger, an anion exchanger, and a mixed ion exchanger connected in sequence. The dosing system also includes multiple fourth and fifth dosing lines. The first end of the fourth dosing line and the first end of the fifth dosing line are respectively connected to the outlet of the dosing solution tank. The second end of the fourth dosing line is split in two and connected to the cation exchanger and the mixed ion exchanger. The second end of the fifth dosing line is split in two and connected to the anion exchanger and the mixed ion exchanger.

5. The nuclear power plant water treatment system as described in claim 2, characterized in that, The water production system further includes a pretreatment subsystem located between the water intake system and the ultrafiltration subsystem; the dosing system further includes a plurality of first dosing pipelines, the first end of each first dosing pipeline being connected to a dosing solution tank, and the second end of each first dosing pipeline being connected to the pretreatment subsystem to provide the pretreatment subsystem with bactericides, flocculants, and coagulants.

6. The nuclear power plant water treatment system as described in any one of claims 1 to 5, characterized in that, It also includes a centralized control system. The water intake system, water production system, SEI water tank, SED water tank and SER water tank are all equipped with liquid level sensors. Control elements are respectively provided between the water intake system and the ultrafiltration subsystem, between the SEI water tank and the SEI distribution network, between the SED water tank and the SED distribution network, and between the SER water tank and the SER distribution network. The centralized control system is connected to the opening and closing of the water intake system, the water production system, each of the liquid level sensors and each of the control elements.

7. The nuclear power plant water treatment system as described in claim 6, characterized in that, The centralized control system, the water intake system, the water distribution system, and the chemical dosing system are distributed around the water production system.

8. The nuclear power plant water treatment system as described in any one of claims 1 to 5, characterized in that, It also includes a wastewater system, which comprises a wastewater collection tank, a wastewater treatment tank, and a reclaimed water tank connected in sequence. The inlet of the wastewater collection tank is connected to the wastewater outlet of the water treatment system and the wastewater outlet of the nuclear power plant unit system. The outlet of the reclaimed water tank is connected to the outlet of the SEI water tank.

9. The nuclear power plant water treatment system as described in claim 8, characterized in that, The wastewater system, the water intake system, and the water distribution system are distributed around the water production system.

10. The nuclear power plant water treatment system as described in claim 8, characterized in that, The water treatment system, the wastewater system, and the water distribution system are arranged around the dosing system.

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