A device for controlling purification of a phosphate system of a nuclear power plant

Abstract

The utility model is suitable for nuclear power detection field, disclose a kind of device for controlling nuclear power plant phosphate system purification, it include: with the water outlet connection and detect the light transmission detection unit of discharge liquid light transmission, with the light transmission detection unit connection and can switch waterway's first switch valve, with the switch valve connection and for purifying phosphate system discharge liquid's purification unit, with the purification unit connection and for storing the water tank of the liquid purified by the purification unit, with the light transmission detection unit, the control unit of first switch valve electricity connection;Wherein, the first switch valve forms two waterways, the first switch valve, the purification unit and the water tank are formed by pipeline purification waterway;The first switch valve and the water tank are formed by pipeline straight-through waterway.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power detection, and in particular to a device for controlling the purification of phosphate systems in nuclear power plants. Background Technology

[0002] The cooling water system for nuclear island equipment is one of the most important closed-loop cooling water systems in a nuclear power plant. Chemical treatment of the cooling water and control of its quality according to certain standards are crucial measures to prevent corrosion and fouling within the system. The main purpose of chemical treatment of the cooling water for nuclear island equipment in nuclear power plants is material corrosion prevention. In China, the chemical treatment of cooling water for nuclear island equipment mainly involves adding phosphate corrosion inhibitors for corrosion prevention.

[0003] Currently, nuclear power plant phosphate systems face the following problems: Particles in the phosphate system need to be removed by a purification system, but this requires manual sampling and analysis of the water samples to determine if filtration is necessary. This can easily lead to excessive radiation exposure for users, affecting their health. If the phosphate system is continuously subjected to purification to remove particles, it will overload the purification system, significantly reducing its lifespan. Therefore, there is an urgent need for a device that can automatically analyze the phosphate system and control the start and stop of the purification system. Utility Model Content

[0004] The technical problem to be solved by this invention is to provide a device for controlling the purification of phosphate systems in nuclear power plants.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A device for controlling the purification of a phosphate system in a nuclear power plant is constructed, comprising: a light transmittance detection unit connected to the outlet and detecting the light transmittance of the discharged liquid; a first switching valve connected to the light transmittance detection unit and used for switching water paths; a purification unit connected to the first switching valve and used for purifying the discharged liquid from the phosphate system; a water storage tank connected to the purification unit and used for storing the liquid purified by the purification unit; and a control unit electrically connected to the light transmittance detection unit and the first switching valve. The first switching valve, the purification unit, and the water storage tank form a purified water path through a pipeline; the first switching valve and the water storage tank form a direct water path through a pipeline; and the first switching valve switches the connection between the purified water path and the direct water path.

[0006] Furthermore, the light transmittance detection unit includes a housing, a light transmittance sample cell disposed within the housing and connected to the water outlet, a light source module disposed within the housing and used to irradiate the light transmittance sample cell, and a light source detection module disposed within the housing and used to receive and detect the light emitted by the light source module. The light source module and the light source detection module are electrically connected to the control unit.

[0007] Furthermore, the light-transmitting sample cell is a cuboid shape with a light transmittance greater than 85%, and the light source module and the light source detection module are symmetrically arranged on both sides of the light-transmitting sample cell.

[0008] Furthermore, one end of the light-transmitting sample tank is provided with a sealed water outlet connector connected to the first switching valve, and the other end of the light-transmitting sample tank is provided with a sealed water inlet connector connected to the outlet of the phosphate system. A first switching valve is provided on the pipe connecting the sealed water inlet connector and the outlet, and the first switching valve is electrically connected to the control unit.

[0009] Furthermore, a second switch valve and a second switching valve are provided on the pipe connecting the water storage tank and the water inlet. The second switching valve connects two water paths. The second switching valve is connected to the water inlet of the phosphate system to form the first water path, and the second switching valve is connected to the pipe of the water outlet of the phosphate system to form the second water path.

[0010] Furthermore, the water storage tank is equipped with a first level gauge for detecting the liquid level in the water storage tank and a drain valve for discharging the liquid in the water storage tank.

[0011] Furthermore, the purification unit includes a primary filter connected to the outlet of the phosphate system, a secondary filter connected to the primary filter via a pipeline, a product water tank connected to the secondary filter via a pipeline, and a return water pump connected to the product water tank. The return water pump is connected to the storage tank via a pipeline. The primary filter, the secondary filter, the product water tank, and the return water pump form a first purification water path.

[0012] Furthermore, a first bypass branch pipe is provided on the pipe connecting the secondary filter and the product water tank. The first bypass branch pipe connects the product water tank and the secondary filter. The first bypass branch pipe is equipped with a turbidity meter for detecting the turbidity of the liquid and a pH meter for detecting the pH value of the liquid.

[0013] Furthermore, the pipeline between the secondary filter and the product water tank is equipped with a third switching valve and a second bypass branch pipe, the second bypass branch pipe being directly connected to the water storage tank.

[0014] Furthermore, a fourth switching valve is provided between the primary filter and the secondary filter, and a third bypass branch pipe is provided between the primary filter and the secondary filter, which is connected to the second bypass branch pipe. A fifth switching valve is provided on the third bypass branch pipe.

[0015] The present invention discloses a device for controlling the purification of a phosphate system in a nuclear power plant, which has the following beneficial effects: A light transmittance detection unit is connected to the outlet of the phosphate system via a pipeline. The unit automatically detects the light transmittance of the liquid at the outlet to determine particle size. If the control unit determines that the light transmittance is greater than a specified value, the particle size is acceptable. If so, the control unit controls the first switching valve to directly deliver the liquid to the storage tank and then to the inlet of the phosphate system without passing through the purification unit. If the control unit determines that the light transmittance is less than a specified value, the particle size is unacceptable. The control unit then controls the first switching valve to purify the liquid through the purification unit. The purified liquid is then directly delivered to the storage tank and then to the inlet of the phosphate system. The entire process of particle size detection in the phosphate system is automated, requiring no manual operation. The device automatically determines whether to activate the purification unit based on particle size, greatly extending the service life of the purification unit and reducing the radiation dose for users. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is an overall diagram of a device for controlling the purification of a phosphate system in a nuclear power plant, according to one embodiment of the present invention. Figure 2 This is a structural diagram of a transmittance detection unit for controlling the purification of a phosphate system in a nuclear power plant, according to one embodiment of this utility model. Figure 3 This is a structural diagram of a purification unit of a device for controlling the purification of a phosphate system in a nuclear power plant, according to one embodiment of this utility model.

[0017] Figure Labels 100. Phosphate system; 200. Purification unit; 201. Third hydraulic sensor; 202. Temperature sensor; 203. Electric valve; 204. Flow meter; 205. Pressure reducing valve; 210. Primary filter; 211. First hydraulic sensor; 212. First drain valve; 213. Fifth valve; 214. Primary vent valve; 220. Secondary filter; 221. Second hydraulic sensor; 222. Outlet valve; 223. Secondary vent valve; 224. Fourth valve; 225. Second drain valve; 226. Pressure relief valve; 230. Product water tank; 231. Second level gauge; 232. Discharge valve; 240. Return water pump; 241. 1. Return water flow valve; 242. Return water switch valve; 261. Third switch valve; 270. First bypass branch pipe; 271. Turbidity and pH detector; 272. Sixth switch valve; 273. Seventh switch valve; 280. Second bypass branch pipe; 290. First purified water circuit; 300. Transmittance detection unit; 310. Box body; 320. Transmittance sample tank; 321. Sealed water inlet connector; 322. Sealed water outlet connector; 330. First switch valve; 340. Light source module; 350. Light source detection module; 400. First switching valve; 500. Water storage tank; 510. First level gauge; 520. Drain valve; 600. Second switch valve; 700. Control unit. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0019] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] Figures 1 to 3 This invention illustrates an apparatus for controlling the purification of a phosphate system 100 in a nuclear power plant, according to one embodiment of the present invention. This apparatus can be used for particle size detection and filtration startup of the phosphate system 100 in a nuclear power plant. It may include a light transmittance detection unit connected to the outlet and detecting the light transmittance of the discharged liquid; a first switching valve 400 connected to the light transmittance detection unit and used for switching water paths; a purification unit 200 connected to the first switching valve 400 and used for purifying the discharged liquid from the phosphate system 100; a water storage tank 500 connected to the purification unit 200 and used for storing the purified liquid from the purification unit 200; and a control unit 700 electrically connected to the light transmittance detection unit and the first switching valve 400. The first switching valve 400, the purification unit 200, and the water storage tank 500 form a purified water path through a pipeline; the first switching valve 400 and the water storage tank 500 form a direct water path through a pipeline; and the first switching valve 400 switches the connection between the purified water path and the direct water path.

[0021] The light transmittance detection unit is connected to the outlet of the phosphate system 100 via a pipeline. The unit automatically detects the light transmittance of the liquid at the outlet to determine the particle size. If the control unit 700 determines that the light transmittance is greater than a specified value, the particle size is qualified. If the control unit 700 passes the test, it controls the first switching valve 400 to directly deliver the liquid to the storage tank 500 and then to the inlet of the phosphate system 100 without passing through the purification unit 200. If the control unit 700 determines that the light transmittance is less than a specified value, the particle size is unqualified. The control unit 700 then controls the first switching valve 400 to purify the liquid through the purification unit 200. After purification, the liquid is directly delivered to the storage tank 500 and then to the inlet of the phosphate system 100. The entire process of particle size detection in the phosphate system 100 is automated and requires no manual operation. It automatically determines whether to activate the purification unit 200 based on the particle size, greatly extending the service life of the purification unit 200 and reducing the radiation dose to the user.

[0022] Understandably, the transmittance detection unit 300 detects the transmittance data and transmits it to the control unit 700. The control unit 700 determines the relationship between transmittance and particle size to obtain the particle size parameter. Then, the control unit 700 controls the first switching valve 400 to switch the water path based on the particle size parameter.

[0023] Figure 2 The light transmittance detection unit, as shown in one embodiment, may include a housing 310, a light transmittance sample tank 320 disposed within the housing 310 and connected to the water outlet, a light source module 340 disposed within the housing 310 for irradiating the light transmittance sample tank, and a light source detection module 350 disposed within the housing 310 for receiving and detecting the light emitted from the light source module 340. The light source module 340 and the light source detection module 350 are electrically connected to the control unit 700. The liquid of the phosphate system 100 is delivered into the light transmittance sample tank 320, and the light source module 340 irradiates the light source detection module 350. The light originates from the light source module 340, passes through the light transmittance sample tank 320, passes through the phosphate liquid, and finally reaches the light source detection module 350. The light source detection module 350 detects the light transmittance of the phosphate liquid, and the light transmittance data is transmitted to the control unit 700.

[0024] In one specific embodiment, the housing 310 is provided with a hinged door, which the user can open to replace the light-transmitting sample slot 320.

[0025] In one specific embodiment, a temperature sensor 202 is provided on the side wall of the light-transmitting sample tank 320. The temperature sensor 202 is electrically connected to the control unit 700. The temperature sensor 202 detects the liquid temperature in the light-transmitting sample tank 320. The control unit 700 obtains the liquid temperature data and corrects the light transmittance.

[0026] Figure 2The light-transmitting sample cell 320 is shown in one embodiment. It may be a cuboid-shaped light-transmitting sample cell 320 with a light transmittance greater than 85%. The light source module 340 and the light source detection module 350 are symmetrically arranged on both sides of the light-transmitting sample cell 320. The higher the light transmittance of the light-transmitting sample cell 320, the smaller the impact on the detection error, thus improving the detection accuracy.

[0027] Figure 2 The light-transmitting sample tank 320, as shown in one embodiment, may include a sealed water outlet connector 322 at one end of the light-transmitting sample tank 320 connected to a first switching valve 400, and a sealed water inlet connector 321 at the other end of the light-transmitting sample tank 320 connected to the water outlet of the phosphate system 100. A first switching valve 330 is provided on the pipe connecting the sealed water inlet connector 321 and the water outlet. The first switching valve 330 is electrically connected to the control unit 700 and can control the inflow and outflow of phosphate liquid. The sealed water outlet connector 322 and the sealed water inlet connector 321 ensure that the liquid does not leak from the light-transmitting sample tank.

[0028] Figure 1 In one embodiment, the water storage tank 500 may include a second switching valve 600 and a second switching valve on the pipe connecting the water storage tank 500 and the water inlet. The second switching valve connects two water paths. The second switching valve is connected to the water inlet of the phosphate system 100 to form a first water path, and the second switching valve is connected to the pipe of the water outlet of the phosphate system 100 to form a second water path. The control unit 700 can control the second switching valve to switch to the second water path. The transmittance detection unit 300 detects the transmittance of the returned liquid. Only when the transmittance is qualified will the liquid be switched to the first water path to supply the water inlet of the phosphate system 100, thereby improving the filtration effect and preventing the filtrate with unqualified transmittance from directly entering the phosphate system 100.

[0029] Figure 1 The water storage tank 500 is shown in one embodiment and may include a first level gauge 510 for detecting the liquid level in the water storage tank 500 and a drain valve 520 for draining the liquid in the water storage tank 500. The first level gauge 510 detects the liquid level in the water storage tank 500, and when it is higher than a specified value, the liquid can be drained through the second drain valve 520.

[0030] Figure 3The purification unit 200, as shown in one embodiment, may include a primary filter 210 connected to the outlet of the phosphate system 100, a secondary filter 220 connected to the primary filter 210 via a pipe, a product water tank 230 connected to the secondary filter 220 via a pipe, and a return water pump 240 connected to the product water tank 230 via a pipe. The return water pump 240 is connected to the storage tank via a pipe. The primary filter 210, secondary filter 220, product water tank 230, and return water pump 240 form a first purified water path 290. After passing through the primary filter 210 and secondary filter 220, the liquid from the phosphate system 100, having had suspended particles removed, then flows through the product water tank 230 and return water pump 240 to the storage tank.

[0031] In one specific embodiment, the water production tank 230 is equipped with a second liquid level gauge 231 and a drain valve 232. The second liquid level gauge 231 detects the liquid level in the water production tank 230. When the level is higher than the specified level, the excess liquid is discharged through the drain valve 232.

[0032] In one specific embodiment, a return water flow meter 204 is provided at the return water pump 240.

[0033] Figure 3 The purification unit 200, in one embodiment, may include a first bypass branch pipe 270 on the pipeline connecting the secondary filter 220 and the product water tank 230. The first bypass branch pipe 270 connects the product water tank 230 and the secondary filter 220, and is equipped with a turbidimeter for detecting the turbidity of the liquid and a pH meter for detecting the pH value of the liquid. The liquid filtered by the secondary filter 220 passes through the first bypass branch pipe 270, and the turbidity and pH value of the liquid are detected.

[0034] In one specific embodiment, the turbidity meter and the pH meter are integrated into a single turbidity and pH meter 271.

[0035] In one specific embodiment, the pH range of the liquid is 11-13, and the turbidity is less than 1 NTU.

[0036] In one specific embodiment, the turbidity and pH detector 271 is equipped with a sixth switching valve 272 and a seventh switching valve 273 before and after the pipeline. The sixth switching valve 272 and the seventh switching valve 273 can control the liquid flow rate in the pipeline of the turbidity and pH detector 271. Because phosphate liquid is alkaline and easily corrodes the turbidity and pH detector 271, the sixth switching valve 272 and the seventh switching valve 273 need to be opened only when necessary. Under normal circumstances, the sixth switching valve 272 and the seventh switching valve 273 are in the closed state.

[0037] In one specific embodiment, the secondary filter 220 is provided with a drain valve for discharging the high-pressure liquid accumulated in the primary and secondary filter valves.

[0038] Figure 3 The purification unit 200, in one embodiment, may include a pipeline between a secondary filter 220 and a product water tank 230 equipped with a third switching valve 261 and a second bypass branch pipe 280, which is directly connected to a water storage tank. The second bypass branch pipe 280 can be used to return water to the water storage tank or for sampling and testing. The third switching valve 261 can close the pipeline between the secondary filter 220 and the product water tank 230, allowing the liquid from the secondary filter 220 to flow directly into the second bypass branch pipe 280.

[0039] Figure 3 The purification unit 200, in one embodiment, may include a fourth switching valve 224 between a primary filter 210 and a secondary filter 220, and a third bypass branch pipe connecting the primary filter 210 and the secondary filter 220 to a second bypass branch pipe 280. A fifth switching valve 213 is installed on the third bypass branch pipe. The fourth switching valve 224 controls the flow of water between the primary filter 210 and the secondary filter 220. The fifth bypass branch pipe is directly connected to the second bypass branch pipe 280, allowing water filtered by the primary filter 210 to be directly delivered into the second bypass branch pipe 280 for sampling and testing.

[0040] In one specific embodiment, the first-stage filter 210 is provided with a first drain pipe at the bottom, and the second-stage filter 220 is provided with a second drain pipe at the bottom. The first drain pipe is provided with a first drain valve 212, and the second drain pipe is provided with a second drain valve 225. The first drain pipe and the second drain pipe are connected to the sewage tank. After long-term use, the first-stage filter 210 and the second-stage filter 220 will accumulate dirt, which can be discharged through the first drain pipe and the second drain pipe.

[0041] In one specific embodiment, the primary filter 210 is equipped with a first hydraulic sensor 211, and the secondary filter 220 is equipped with a second hydraulic sensor 221. The first hydraulic sensor 211 and the second hydraulic sensing and detection control unit 700 are electrically connected. The pressure detected by the second hydraulic sensor 221 is compared with the pressure detected by the first hydraulic sensor 211. When the pressure of the second hydraulic sensor 221 is less than that of the first hydraulic sensor 211, and the difference is greater than a certain value, it is determined that the filter is blocked and the filter element inside needs to be replaced in time.

[0042] In one specific embodiment, the pressure difference is 0.2 MPa. When the pressure difference between the second hydraulic sensor 221 and the first hydraulic sensor 211 is greater than 0.2 MPa, the filter element needs to be replaced.

[0043] In one specific embodiment, the pipeline between the primary filter 210 and the outlet of the phosphate system 100 is equipped with a third hydraulic sensor 201 for detecting the pressure inside the pipeline, a temperature sensor 202 for detecting the temperature inside the pipeline, a flow meter 204 for detecting the flow rate of the liquid inside the pipeline, an electric valve 203 for controlling the pipeline switch, and a pressure reducing valve 205 for controlling the pressure of the liquid inside the pipeline. The third hydraulic sensor 201, temperature sensor 202, flow meter 204, electric valve 203, and pressure reducing valve 205 are electrically connected to the detection control unit 700. The detection control unit 700 detects and controls the liquid entering the phosphate system 100 through the third hydraulic sensor 201, temperature sensor 202, flow meter 204, electric valve 203, and pressure reducing valve 205.

[0044] Furthermore, when the pressure difference between the third hydraulic sensor 201 and the first hydraulic sensor 211 exceeds a specified value, the first filter needs to have its filter element replaced.

[0045] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An apparatus for controlling purification of a phosphate system of a nuclear power plant, the phosphate system (100) comprising an inlet and an outlet, characterized in that, include: A light transmittance detection unit connected to the outlet and for detecting the light transmittance of the discharged liquid; a first switching valve (400) connected to the light transmittance detection unit and for switching the water path; a purification unit (200) connected to the first switching valve (400) and for purifying the liquid discharged from the phosphate system (100); a water storage tank (500) connected to the purification unit (200) and for storing the liquid purified by the purification unit (200); and a control unit (700) electrically connected to the light transmittance detection unit and the first switching valve (400). The first switching valve (400), the purification unit (200), and the water storage tank (500) form a purified water path through a pipeline; the first switching valve (400) and the water storage tank (500) form a direct water path through a pipeline, and the first switching valve (400) switches the flow between the purified water path and the direct water path.

2. A device for controlling purification of a phosphate system of a nuclear power plant according to claim 1, characterized in that, The light transmittance detection unit includes a housing (310), a light transmittance sample cell (320) disposed in the housing (310) and connected to the water outlet, a light source module (340) disposed in the housing (310) and used to irradiate the light transmittance sample cell (320), and a light source detection module (350) disposed in the housing (310) and used to receive and detect the light emitted by the light source module (340). The light source module (340) and the light source detection module (350) are electrically connected to the control unit (700).

3. A device for controlling the purification of a phosphate system of a nuclear power plant according to claim 2, characterized in that, The light-transmitting sample groove (320) is a cuboid-shaped light-transmitting sample groove (320) with a light transmittance greater than 85%. The light source module (340) and the light source detection module (350) are symmetrically arranged on both sides of the light-transmitting sample groove (320).

4. A device for controlling the purification of a phosphate system of a nuclear power plant according to claim 2, characterized in that, One end of the light-transmitting sample tank (320) is provided with a sealed water outlet connector (322) connected to the first switching valve (400), and the other end of the light-transmitting sample tank (320) is provided with a sealed water inlet connector (321) connected to the water outlet of the phosphate system (100). A first switching valve (330) is provided on the pipe connecting the sealed water inlet connector (321) and the water outlet. The first switching valve (330) is electrically connected to the control unit (700).

5. A device for controlling purification of a phosphate system of a nuclear power plant according to claim 1, characterized in that, The water storage tank (500) is connected to the water inlet via a pipe equipped with a second switch valve (600) and a second switching valve. The second switching valve connects two water paths. The second switching valve is connected to the water inlet of the phosphate system (100) to form the first water path, and the second switching valve is connected to the pipe of the water outlet of the phosphate system (100) to form the second water path.

6. The apparatus for controlling the purification of a phosphate system in a nuclear power plant according to claim 1, characterized in that, The water storage tank (500) is equipped with a first level gauge (510) for detecting the liquid level in the water storage tank (500) and a drain valve (520) for draining the liquid in the water storage tank (500).

7. The apparatus for controlling the purification of a phosphate system in a nuclear power plant according to claim 1, characterized in that, The purification unit (200) includes a primary filter (210) connected to the outlet of the phosphate system (100), a secondary filter (220) connected to the primary filter (210) via a pipe, a product water tank (230) connected to the secondary filter (220) via a pipe, and a return water pump (240) connected to the product water tank (230). The return water pump (240) is connected to the water storage tank via a pipe. The primary filter (210), the secondary filter (220), the product water tank (230), and the return water pump (240) form the first purified water path (290).

8. The apparatus for controlling the purification of a phosphate system in a nuclear power plant according to claim 7, characterized in that, A first bypass branch pipe (270) is provided on the pipe connecting the secondary filter (220) and the product water tank (230). The first bypass branch pipe (270) connects the product water tank (230) and the secondary filter (220). The first bypass branch pipe (270) is provided with a turbidity meter for detecting the turbidity of the liquid and a pH meter for detecting the pH value of the liquid.

9. The apparatus for controlling the purification of a phosphate system in a nuclear power plant according to claim 8, characterized in that, The pipeline between the secondary filter (220) and the water production tank (230) is equipped with a third switch valve (261) and a second bypass branch pipe (280), the second bypass branch pipe (280) being directly connected to the water storage tank.

10. The apparatus for controlling the purification of a phosphate system in a nuclear power plant according to claim 9, characterized in that, A fourth switching valve (224) is provided between the primary filter (210) and the secondary filter (220), and a third bypass branch pipe is provided between the primary filter (210) and the secondary filter (220) to connect the second bypass branch pipe (280), and a fifth switching valve (213) is provided on the third bypass branch pipe.

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