Water affair treatment system for nuclear power plant

Abstract

The invention is applicable to the technical field of water treatment, and provides a nuclear power plant water treatment system which comprises a water taking system, a water making system, a water distribution system and a chemical adding system, a water inlet of an SEI water tank is connected with a water outlet of a reverse osmosis subsystem, and a water outlet of the SEI water tank is connected with a water inlet of an ion exchange treatment subsystem; and a water inlet of the SED water tank and a water inlet of the SER water tank are connected with a water outlet of the ion exchange treatment subsystem. An ultrafiltration subsystem, a reverse osmosis subsystem and an ion exchange treatment subsystem are integrated in the water production system, after one part of industrial fresh water is provided for the SEI water tank, the other part of industrial fresh water enters the ion exchange treatment subsystem again for continuous treatment, and the industrial fresh water, neutral desalted water and alkaline desalted water share a partial treatment process; repeated configuration of equipment in the preparation process of water with different qualities is reduced, decentralized and extra land occupation of system equipment in a plant is reduced, overall planning and utilization of space in the plant are facilitated, and production cost and management cost are reduced.

Description

Technical Field

[0001] The present application relates to the field of water treatment technology, and in particular to a water treatment system for a nuclear power plant. Background Art

[0002] Water is an important carrier for energy transfer and conversion in nuclear power plant units, and the entire production and operation process of a nuclear power plant cannot be separated from water.

[0003] Most of the industrial water needed by nuclear power plants comes from nature, for example, water is taken directly from the ocean or inland water sources and then treated. The purified desalted water enters the various systems of the unit through different pipelines. For pressurized water reactor nuclear power units, in the primary circuit, water is used as a coolant and moderator, directly participating in the reaction of the reactor, and is the guarantee for the safe and stable operation of the nuclear power unit. Strict requirements are placed on water quality in this process; in the secondary circuit, water is used as a source of steam, circulating in the steam turbine generator system to drive the generator to generate electricity; in the tertiary circuit, the main function of water is to cool the heat exchange equipment as the final heat sink. In this process, water does not directly participate in the operation of the unit.

[0004] Most of the existing water treatment systems in nuclear power plants are decentralized, and there are problems of dispersion and redundancy between the various treatment systems in the process. With the construction and expansion of the units, there are more and more duplicate treatment systems. Not only does it lead to a large and scattered footprint, which is not conducive to the overall space planning within the power plant, but also the duplicate systems need to be maintained and managed, which requires a lot of manpower and material resources, and may also lead to problems with inconsistent water quality. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a nuclear power plant water treatment system, which aims to solve the technical problems of existing nuclear power plant water treatment, such as repeated modules occupying a large area and being scattered, being unfavorable for power plant space planning, and requiring a large amount of manpower and material resources for maintenance.

[0006] The embodiment of the present application is implemented as follows: a water treatment system for a nuclear power plant, comprising:

[0007] A water intake system, wherein the water intake of the water intake system is used to take water from the ocean;

[0008] The water production system comprises 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 intake system; and the ion exchange treatment subsystem is also included for replacing and removing cations and anions from desalinated water;

[0009] A water distribution system, comprising a SEI subsystem, a SED subsystem and a SER subsystem, wherein the SEI subsystem comprises a SEI water tank and a SEI distribution network connected in sequence, the SED subsystem comprises a SED water tank and a SED distribution network connected in sequence, and the SER subsystem comprises a SER water tank and a SER distribution 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 also connected to the water inlet of the ion exchange treatment subsystem, and the water inlet of the SED water tank and the water inlet of the SER water tank are connected in parallel to the water outlet of the ion exchange treatment subsystem; and

[0010] The dosing system is respectively connected to the water intake system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem, and the water inlet of the SER water tank, so as 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.

[0011] In one embodiment, the dosing system includes multiple dosing solution tanks, multiple second dosing pipelines, and multiple third dosing pipelines; the first end of the second dosing pipeline is connected to the dosing solution tank, and the second end of the second dosing pipeline is connected to the ultrafiltration subsystem, which is used to provide multiple agents to the ultrafiltration subsystem; the first end of the third dosing pipeline is connected to the dosing solution tank, and the second end of the third dosing pipeline is connected to the reverse osmosis subsystem, which is used to provide multiple agents to the reverse osmosis subsystem; wherein each of the dosing solution tanks is correspondingly provided with one agent, and the second dosing pipeline and the third dosing pipeline that are used to transport the same agent are partially shared.

[0012] In one embodiment, the reverse osmosis subsystem includes a plurality of reverse osmosis devices connected in sequence; the first end of each of the third dosing pipelines is connected to the dosing solution tank, and the second end of each of the third dosing pipelines is connected to each of the reverse osmosis devices in a one-to-many manner; each of the third dosing pipelines is used to transport a chemical to each of the reverse osmosis devices, and the chemical provided to each of the reverse osmosis devices includes multiple types of antiscalants, reducing agents, cleaning agents, acidic substances and alkaline substances.

[0013] In one embodiment, the ion exchange treatment subsystem includes a cation exchanger, an anion exchanger and a mixed ion exchanger connected in sequence, and the dosing system also includes a plurality of fourth dosing pipelines and a fifth dosing pipeline, the first end of the fourth dosing pipeline and the first end of the fifth dosing pipeline are respectively connected to the liquid outlet of the drug dispensing solution tank, the second end of the fourth dosing pipeline is divided into two and connected to the cation exchanger and the mixed ion exchanger, and the second end of the fifth dosing pipeline is divided into two and connected to the anion exchanger and the mixed ion exchanger.

[0014] In one embodiment, the water production system also includes a pretreatment subsystem, which is arranged between the water intake system and the ultrafiltration subsystem; the dosing system also includes a plurality of first dosing pipelines, the first end of each of the first dosing pipelines is connected to a dosing solution tank, and the second end of each of the first dosing pipelines is connected to the pretreatment subsystem to provide bactericides, flocculants, and coagulants to the pretreatment subsystem.

[0015] In one embodiment, a centralized control system is further included, wherein the water intake system, the water production system, the SEI water tank, the SED water tank and the SER water tank are all provided with liquid level sensors, and 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 respectively connected to the water intake system, the water production system, the liquid level sensors and the opening and closing of the control elements.

[0016] In one embodiment, the centralized control system, the water intake system, the water distribution system, and the drug adding system are distributed around the water production system.

[0017] In one embodiment, the wastewater system is further included, and the wastewater system includes a wastewater collection tank, a wastewater treatment tank, and a reuse water tank connected in sequence, the water inlet of the wastewater collection tank is connected to the wastewater outlet of the water production system and the wastewater outlet of the nuclear power plant unit system, and the water outlet of the reuse water tank is connected to the water outlet of the SEI water tank.

[0018] In one embodiment, the wastewater system, the water intake system, and the water distribution system are distributed around the water production system.

[0019] In one embodiment, the water production system, the wastewater system, and the water distribution system are arranged around the dosing system.

[0020] The nuclear power plant water treatment system provided in the embodiment of the present application has the following beneficial effects:

[0021] The nuclear power plant water treatment system provided in the embodiment of the present application integrates an ultrafiltration subsystem, a reverse osmosis subsystem and an ion exchange treatment subsystem in the water production system. After a portion of industrial fresh water is provided to the SEI water tank, the other portion of the industrial fresh water enters the ion exchange treatment subsystem of the water production system again for further treatment, and finally obtains neutral desalted water. The neutral desalted water is adjusted by adding drugs to obtain alkaline desalted water. In this way, industrial fresh water, neutral desalted water and alkaline desalted water share some treatment processes, which can reduce the repeated configuration of equipment in the preparation process of different water uses, and also reduce the dispersion and additional land occupation of repeated equipment in the plant area, which is beneficial to the overall planning and utilization of space in the plant area, reduces the manpower and material resources investment in the management of repeated modules, and reduces production costs and management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a water treatment system for a nuclear power plant provided in an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the layout of the water treatment system of a nuclear power plant provided in an embodiment of the present application within the plant area;

[0025] Figure 3 It is a schematic diagram of the configuration of the dosing system in the water treatment system of a nuclear power plant provided in an embodiment of the present application.

[0026] The meanings of the marks in the figure are:

[0027] 100- Nuclear power plant water treatment system;

[0028] 3-water intake system, 31-water intake pump, 32-water storage tank;

[0029] 4-water production 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;

[0030] 5- water distribution system, 51- SEI subsystem, 511- SEI water tank, 512- SEI water pump, 513- SEI distribution network;

[0031] 52-SED subsystem, 521-SED water tank, 522-SED water pump, 523-SED distribution network;

[0032] 53-SER subsystem, 531-SER water tank, 532-SER water pump, 533-SER distribution network;

[0033] 6-dosing system, 61-dosing solution tank, 621-first dosing pipeline, 622-second dosing pipeline, 623-third dosing pipeline, 624-fourth dosing pipeline, 625-fifth dosing pipeline, 626-sixth dosing pipeline;

[0034] 7-Centralized control system;

[0035] 8-wastewater system, 81-wastewater collection tank, 82-wastewater treatment tank, 83-recycled water tank;

[0036] 91-Ocean, 92-Crew area, 93-Layout space. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly fixed or disposed on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of this patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0040] In existing nuclear power plants, industrial water is divided into several types, such as industrial fresh water, neutral desalted water, and alkaline desalted water, according to the different needs of the units. Different types of water are provided to the conventional island and nuclear island of the unit through different distribution pipe networks for use. At present, separate water production paths are usually provided for industrial fresh water, neutral desalted water, and alkaline desalted water. For example, one water production path is from seawater to treatment to obtain industrial fresh water, and the other water production path is from seawater to treatment to obtain neutral desalted water. This has led to repeated configuration of some water production processes. Therefore, additional plant area is occupied, which hinders the overall planning and utilization of space within the plant, and the repeated systems require manual special management, which increases manpower and material costs.

[0041] See also Figure 1 As shown, an 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 of the water intake system 3 is used to take water from the ocean 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 a SER subsystem 53, the SEI subsystem 51 includes an SEI water tank 511 and an SEI distribution network 513 connected in sequence, the SED subsystem 52 includes an SED water tank 521 and an SED distribution network 523 connected in sequence, and the SER subsystem 53 includes a SER water tank 531 and a SER distribution network 533 connected in sequence, wherein the SEI subsystem 51, the SED subsystem 52 and the SER subsystem 53 are provided as three parallel and independent water distribution paths for use by users of the nuclear power plant, namely, units, and the users include conventional islands and nuclear islands; the water inlet of the SEI water tank 511 is connected to the water outlet of the reverse osmosis subsystem 43.

[0042] See also Figure 1 As shown, in the embodiment of the present application, the water production system 4 also includes an ion exchange treatment subsystem 44, which is used to replace and remove cations and anions from desalinated water. The water outlet of the SEI water tank 511 is also connected to the water inlet of the ion exchange treatment subsystem 44, and the water inlet of the SED water tank 521 and the water inlet of the SER water tank 531 are connected in parallel to the water outlet of the ion exchange treatment subsystem 44.

[0043] The dosing system 6 is respectively connected to the water intake system 3, the water preparation system 4, and the water distribution system 5, and is used to provide various chemicals required for water treatment to 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.

[0044] It should be noted that the above-mentioned SEI is an industrial fresh water storage and distribution system, SED is a neutral desalted water storage and distribution system, and SER is an alkaline desalted water storage and distribution system.

[0045] The nuclear power plant water treatment system 100 provided in the embodiment of the present application works as follows:

[0046] The water intake system 3 takes water from the ocean 91, and the seawater enters the water production system 4 and is filtered by the ultrafiltration subsystem 42 to remove suspended particles, impurities and microorganisms. The seawater is treated by the reverse osmosis subsystem 43 to remove salt from the seawater and convert it 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 part of it is distributed to the nuclear island and the conventional island through the SED distribution network 523.

[0047] Another part of the industrial fresh water is processed by the ion exchange treatment subsystem 44, and heavy metal ions, harmful anions, calcium, magnesium and other ions in the water are removed to obtain neutral desalted water; then, 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;

[0048] Another part of the neutral desalted water enters the SER water tank 531. At the same time, the dosing system 6 provides alkaline agent into the SER water tank 531, so that the neutral desalted water is converted into 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 network 533.

[0049] The nuclear power plant water treatment system 100 provided in the embodiment of the present application integrates an ultrafiltration subsystem 42, a reverse osmosis subsystem 43 and an ion exchange treatment subsystem 44 in the water production system 4, and after a portion of the industrial fresh water is provided to the SEI water tank 511, the other portion of the industrial fresh water enters the ion exchange treatment subsystem of the water production system 4 again for further treatment to obtain neutral desalted water, and the neutral desalted water is adjusted by adding drugs to obtain alkaline desalted water. In this way, industrial fresh water, neutral desalted water and alkaline desalted water share some treatment processes, which can reduce the repeated arrangement of modules in the preparation process of different water uses, and also reduce the decentralized and additional land occupation of repeated modules in the plant area, which is conducive to the overall planning and utilization of space in the plant area, reduces the human and material investment in the management of repeated modules, and reduces production costs and management costs.

[0050] like Figure 1 As shown, the water intake system 3 may include a water intake pump 31 and a water storage tank 32. Seawater is temporarily stored in the water storage tank 32. The water in the water storage tank 32 enters the ultrafiltration subsystem 42 and the like for further treatment under the action of the water intake pump 31 and the like.

[0051] See also Figure 1As shown, in one embodiment, the water production system 4 also includes a pretreatment subsystem 41 arranged upstream of the ultrafiltration subsystem 42, which is used to sterilize, coagulate and precipitate the seawater before it enters the ultrafiltration subsystem 42, so as to reduce foreign matter entering the ultrafiltration subsystem 42, especially large-sized foreign matter, and improve the treatment efficiency of the ultrafiltration subsystem 42.

[0052] The dosing system 6 may be connected to the pretreatment subsystem 41 to provide bactericides, flocculants, coagulants and other drugs to the pretreatment subsystem 41 .

[0053] like Figure 3 As shown, in one embodiment, the dosing system 6 includes 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, which is used to provide bactericides, flocculants, coagulants, etc. to the pretreatment subsystem 41, so as to promote the aggregation of tiny particles and colloids in seawater to form larger flocs, thereby achieving solid-liquid separation and preliminary sterilization of seawater; the first end of the second dosing pipeline 622 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, so as to provide the pretreatment subsystem 41 with bactericides, flocculants, coagulants, etc., so as to promote the aggregation of tiny particles and colloids in seawater to form larger flocs, thereby achieving solid-liquid separation and preliminary sterilization of seawater; the first end of the second dosing pipeline 622 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. Box 61, the second end of the second dosing line 622 is connected to the ultrafiltration subsystem 42, for providing bactericides, acidic substances and / or alkaline substances to the ultrafiltration subsystem 42 for further sterilization and preliminary pH adjustment; the first end of the third dosing line 623 is connected to the dispensing solution box 61, and the second end of the third dosing line 623 is connected to the reverse osmosis subsystem 43, for providing antiscalant, reducing agent, cleaning agent, acidic substance and / or alkaline substance to the reverse osmosis subsystem 43 for further sterilization, further pH adjustment, and ensuring the continuous operation of the reverse osmosis subsystem 43.

[0054] It is understandable that, depending on the type of specific medicament, the number of the above-mentioned dispensing solution tank 61, the first dosing pipeline 621, the second dosing pipeline 622 and the third dosing pipeline 623 can be multiple. For example, a dispensing solution tank 61 is arranged corresponding to each medicament, and the pipelines used to provide 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 used to provide bactericides can be partially shared, the second dosing pipeline 622 and the third dosing pipeline 623 used to provide acidic substances can be partially shared, and the second dosing pipeline 622 and the third dosing pipeline 623 used to provide alkaline substances can be partially shared. The same is true for others, which will not be repeated one by one.

[0055] See also Figure 3In one embodiment, the reverse osmosis subsystem 43 includes a plurality of reverse osmosis devices 431 connected in sequence, and two reverse osmosis devices 431 are taken as an example, namely, a primary reverse osmosis device 431 and a secondary reverse osmosis device 431. A first end of the third dosing line 623 is connected to the dosing solution tank 61, and a second end of the third dosing line 623 is connected to each reverse osmosis device 431, for providing each reverse osmosis device 431 with an antiscalant, a reducing agent, a cleaning agent, an acidic substance, an alkaline substance, and the like.

[0056] In other optional embodiments, more reverse osmosis devices 431 may be connected in series.

[0057] Among them, each drug dispensing solution tank 61 is correspondingly provided with a drug, and each third drug dosing pipeline 623 is used to transport a drug. For example, there are multiple third drug dosing pipelines 623, each of which is used to provide a drug, and multiple third drug dosing pipelines 623 used to transport the same drug to multiple reverse osmosis devices 431 are partially shared. For example, two third drug dosing pipelines 623 used to provide antiscalants from the drug dispensing solution tank 61 where antiscalants are provided to the primary reverse osmosis device 431 and the secondary reverse osmosis device 431 are partially shared, and two third drug dosing pipelines 623 used to provide antiscalants from the drug dispensing solution tank 61 where acidic substances are provided to the primary reverse osmosis device 431 and the secondary reverse osmosis device 431 are partially shared. Others may also be the same.

[0058] See also Figure 1 and Figure 3 As shown, 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 sequence, and the water inlet of the cation exchanger 441 is connected to the water outlet of the SEI water tank 511. The dosing system 6 also includes a fourth dosing pipeline 624 and a fifth dosing pipeline 625, the first end of the fourth dosing pipeline 624 and the first end of the fifth dosing pipeline 625 are respectively connected to the liquid outlet of the preparation solution tank 61, the second end of the fourth dosing pipeline 624 is divided into two and connected to the cation exchanger 441 and the mixed ion exchanger 443, and the second end of the fifth dosing pipeline 625 is divided into two and connected to the anion exchanger 442 and the mixed ion exchanger 443.

[0059] Through the fourth dosing line 624, the dosing system 6 can provide a reagent, such as an acidic substance, specifically hydrochloric acid, to the cation exchanger 441 and the mixed ion exchanger 443 to regenerate the failed cation exchange resin to maintain the function of the cation exchange resin to remove anions.

[0060] The dosing system 6 can provide another agent, such as alkaline substances, such as sodium hydroxide, to the anion exchanger 442 and the mixed ion exchanger 443 through the fifth dosing line 625 to regenerate the failed anion exchange resin to maintain the function of the anion exchange resin to remove cations.

[0061] Moreover, the fourth dosing pipeline 624 supplies acidic substances to the cation exchanger 441 and the mixed ion exchanger 443 from a dosing solution tank 61 with acidic substances, thereby realizing partial pipeline sharing. There is no need to configure complex and redundant acidic substance supply pipelines for the cation exchanger 441 and the mixed ion exchanger 443, thereby simplifying the pipeline structure and reducing space occupancy. Similarly, the fifth dosing pipeline 625 supplies alkaline substances to the anion exchanger 442 and the mixed ion exchanger 443 from a dosing solution tank 61 with alkaline substances, thereby realizing partial pipeline sharing. There is no need to configure complex and redundant alkaline substance supply pipelines for the anion exchanger 442 and the mixed ion exchanger 443, thereby simplifying the pipeline structure and reducing space occupancy.

[0062] See also Figure 3 As shown, the dosing system 6 further includes a sixth dosing pipeline 626, a first end of the sixth dosing pipeline 626 is connected to a dosing solution tank 61, and the other end of the sixth dosing pipeline 626 is connected to the SER water tank 531, for providing alkaline substances to the SER water tank 531. The alkaline substances here are preferably alkaline substances that do not introduce other impurity metal ions, such as ammonia water.

[0063] like Figure 1 and Figure 2 As shown, in one embodiment, the nuclear power plant water treatment system 100 also includes a wastewater system 8, which includes a wastewater collection pool 81, a wastewater treatment pool 82, and a reused water pool 83 connected in sequence, the water inlet of the wastewater collection pool 81 is connected to each wastewater outlet of the water production system 4 and the wastewater outlet of each unit, and the water outlet of the reused water pool 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 the wastewater treatment, it can be returned to the SEI water tank 511 again for subsequent use and treatment.

[0064] 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.

[0065] like Figure 1 and Figure 2As shown, in one embodiment, the nuclear power plant water treatment system 100 also includes a centralized control system 7, and the centralized processing module is connected to the water intake system 3, the water production system 4, the water distribution system 5 and the dosing system 6, and is used to obtain the working status information of the water intake system 3, the water production system 4, the water distribution system 5 and the dosing system 6, and to control the operation of the water intake system 3, the water production system 4, the water distribution system 5 and the dosing system 6.

[0066] Specifically, a liquid level sensor is provided in the water storage tank 32 of the water intake system 3, and the water intake pump 31 and the liquid level sensor are both communicatively connected to the centralized control system 7. The liquid level sensor is used to provide the centralized control system 7 with 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.

[0067] Specifically, liquid level sensors are provided in the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43, and the centralized control system 7 is respectively connected to these liquid level sensors so that the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43 all maintain a normal liquid level range, thereby ensuring their normal operation, and ensuring that the liquid levels in the pretreatment subsystem 41, the ultrafiltration subsystem 42 and the reverse osmosis subsystem 43 match the amount of medicine provided by the dosing system 6, thereby ensuring the water quality results after each step of treatment.

[0068] Specifically, in the water distribution system 5, liquid level sensors are provided in the SEI water tank 511, the SED water tank 521 and the SER water tank 531, a SEI water pump 512 is provided between the SEI water tank 511 and the SEI distribution network 513, a SED water pump 522 is provided between the SED water tank 521 and the SED distribution network 523, and a SER water pump 532 is provided between the SER water tank 531 and the SER distribution network 533. The centralized control system 7 is connected to these liquid level sensors and control elements (referring to the SEI water pump 512, the SED water pump 522 and the SER water pump 532) respectively, and is used to obtain liquid level signals of the liquid level sensors and control the opening and closing of these control elements.

[0069] At least one of the following may be provided with a control element, such as a control valve and / or a control pump, between the water intake system 3 and the pretreatment subsystem 41, between the reverse osmosis subsystem 43 and the SEI water tank 511, between the reverse osmosis subsystem 43 and the ion exchange treatment subsystem 44, between the ion exchange treatment subsystem 44 and the SED water tank 521, and between the ion exchange treatment subsystem 44 and the SER water tank 531; the centralized control system 7 is respectively connected to each control valve and / or control pump to control the opening and closing of these control elements.

[0070] Specifically, liquid level sensors are provided in the wastewater collection tank 81, the wastewater treatment tank 82 and the reuse water tank 83. Control elements, such as control valves and / or control pumps, are provided between the wastewater collection tank 81 and the wastewater treatment tank 82, and between the wastewater treatment tank 82 and the reuse water tank 83. The centralized control system 7 is respectively connected to these 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 reuse water tank 83 have appropriate liquid levels.

[0071] See also Figure 2 As shown, in one embodiment, one or more unit areas 92 are provided in a nuclear power plant, and the multiple unit areas 92 may be connected or have a certain distance between them. In actual situations, the unit areas 92 are usually separated by a certain distance for roads or other supporting construction. A layout space 93 is provided on the side of the unit area 92 close to the ocean 91, and the nuclear power plant water treatment system 100 of the embodiment of the present application is located in the layout space 93, that is, on the side of the unit area 92 facing the ocean 91. This allows the nuclear power plant water treatment system 100 to have the shortest processing path in the direction from the ocean 91 to the unit, thereby facilitating the layout of each module and pipeline and simplifying the design.

[0072] Specifically, please refer to the figure, the water production system 4 is located between the water intake system 3 and the water distribution system 5. This allows the shortest 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. It can be understood that, according to the actual situation, the area occupied by each module is not a regular rectangular, circular or other shape. The water production system 4 defined in this 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 configuration module are located in a straight line, but it should be understood that the water intake system 3 is set as close to the ocean 91 as possible, the water distribution system 5 is set as close to the unit area 92 as possible, and the distance between the water production system 4 and the ocean 91 should not be greater than the distance from the water intake system 3 to the ocean 91, and the distance from the water production system 4 to the unit area 92 should not be greater than the distance from the water distribution system 5 to the unit area 92.

[0073] In a specific embodiment, please refer to Figure 2 As shown, 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 evenly distributed around the water production system 4. The purpose of this arrangement is that since the water production system 4 is related to the water intake system 3, the water distribution system 5 and the wastewater system 8, the water production system 4 is generally arranged in the center, so that the paths from the water production system 4 to the water intake system 3, the water distribution system 5 and the wastewater system 8 can be designed to be the shortest overall.

[0074] In one embodiment, see Figure 2As shown, 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 evenly distributed around the water production system 4. The purpose of such a setting is that since the water production system 4 is related to the water intake system 3, the water distribution system 5 and the wastewater system 8, the water production system 4 is generally arranged in the center, 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 wastewater system 8 can be designed to be the shortest overall.

[0075] In one embodiment, see Figure 2 As shown, the centralized control system 7, the water intake system 3, the water distribution system 5 and the dosing system 6 are distributed around the water production system 4. Of course, it is not limited here that the four are evenly distributed around the water production system 4. The purpose of such a setting is that since the water production system 4 is related to the water intake system 3, the water distribution system 5 and the dosing system 6, the water production system 4 is generally arranged in the center, 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 dosing system 6 can be designed to be the shortest overall.

[0076] See also Figure 2 As shown, in one embodiment, the 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 here that the three are evenly distributed around the dosing system 6. The purpose of such arrangement is that since the dosing system 6 is associated with the water production system 4, the water distribution system 5 and the wastewater system 8, the dosing system 6 is generally arranged in the middle, so that the paths from the 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 overall.

[0077] In an optional embodiment, the area occupied by the dosing system 6 is smaller than that of other modules, and in particular, the area of ​​the dosing system 6 is smaller than that of the water production system 4, and the connection between the dosing system 6 and the water production system 4 is closer. Therefore, the 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 dosing system 6, the wastewater system 8 and the water distribution system 5 roughly close to the sum of the areas of the water production system 4 and the wastewater system 8, which is beneficial to the spatial arrangement of the five modules in the direction from the ocean 91 to the unit area 92, and at the same time, ensures that there can be a shorter path design between two adjacent interconnected modules.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in 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 take water from the ocean; The water production system comprises 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 intake system; and the ion exchange treatment subsystem is also included for replacing and removing cations and anions from desalinated water; A water distribution system, comprising a SEI subsystem, a SED subsystem and a SER subsystem, wherein the SEI subsystem comprises a SEI water tank and a SEI distribution network connected in sequence, the SED subsystem comprises a SED water tank and a SED distribution network connected in sequence, and the SER subsystem comprises a SER water tank and a SER distribution 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 also connected to the water inlet of the ion exchange treatment subsystem, and the water inlet of the SED water tank and the water inlet of the SER water tank are connected in parallel to the water outlet of the ion exchange treatment subsystem; and The dosing system is respectively connected to the water intake system, the ultrafiltration subsystem, the reverse osmosis subsystem, the ion exchange treatment subsystem, and the water inlet of the SER water tank, so as 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 according to claim 1, characterized in that: The dosing system includes a plurality of dosing 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 dosing solution tank, and the second end of the second dosing pipeline is connected to the ultrafiltration subsystem, for providing a plurality of reagents to the ultrafiltration subsystem; the first end of the third dosing pipeline is connected to the dosing solution tank, and the second end of the third dosing pipeline is connected to the reverse osmosis subsystem, for providing a plurality of reagents to the reverse osmosis subsystem; wherein each of the dosing solution tanks is provided with a corresponding reagent, and the second dosing pipeline and the third dosing pipeline for conveying the same reagent are partially shared.

3. The nuclear power plant water treatment system according to claim 2, characterized in that: The reverse osmosis subsystem includes a plurality of reverse osmosis devices connected in sequence; the first end of each of the third dosing pipelines is connected to the dosing solution tank, and the second end of each of the third dosing pipelines is connected to each of the reverse osmosis devices in a one-to-many manner; each of the third dosing pipelines is used to transport a reagent to each of the reverse osmosis devices, and the reagents provided to each of the reverse osmosis devices include multiple types of antiscalants, reducing agents, cleaning agents, acidic substances and alkaline substances.

4. The nuclear power plant water treatment system according to 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, and the dosing system also includes a plurality of fourth dosing pipelines and a fifth dosing pipeline. The first end of the fourth dosing pipeline and the first end of the fifth dosing pipeline are respectively connected to the liquid outlet of the drug dispensing solution tank, the second end of the fourth dosing pipeline is divided into two and connected to the cation exchanger and the mixed ion exchanger, and the second end of the fifth dosing pipeline is divided into two and connected to the anion exchanger and the mixed ion exchanger.

5. The nuclear power plant water treatment system according to claim 2, characterized in that: The water production system also includes a pretreatment subsystem, which is arranged between the water intake system and the ultrafiltration subsystem; the dosing system also includes a plurality of first dosing pipelines, the first end of each of the first dosing pipelines is connected to a dosing solution tank, and the second end of each of the first dosing pipelines is connected to the pretreatment subsystem to provide bactericides, flocculants, and coagulants to the pretreatment subsystem.

6. The nuclear power plant water treatment system according to any one of claims 1 to 5, characterized in that: It also includes a centralized control system. Liquid level sensors are provided in the water intake system, the water production system, the SEI water tank, the SED water tank and the SER water tank. Control elements are 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 respectively connected to the water intake system, the water production system, the liquid level sensors and the opening and closing of the control elements.

7. The nuclear power plant water treatment system according to claim 6, characterized in that: The centralized control system, the water intake system, the water distribution system, and the drug adding system are distributed around the water production system.

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

9. The nuclear power plant water treatment system according to 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 according to claim 8, characterized in that: The water production system, the wastewater system and the water distribution system are arranged around the dosing system.

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