A dosing device after bypass purification in a nuclear power plant phosphate system

Abstract

This utility model applies to the field of cooling water and discloses a bypass purification and dosing device for a nuclear power plant phosphate system, comprising: a purification device connected to the outlet of the phosphate system for purifying suspended solids in the phosphate system; a phosphate brine tank for storing high-concentration phosphate; a deionized water tank for storing deionized water; a buffer dosing tank connected to the purification device, the phosphate brine tank, and the deionized water tank via pipelines; a first flow control valve installed in the pipeline connecting the phosphate brine tank and the buffer dosing tank; a second flow control valve installed in the pipeline connecting the deionized water tank and the buffer dosing tank; and a detection and control unit electrically connected to the first and second flow control valves; wherein, the phosphate system outlet, the purification device, the buffer dosing tank, and the phosphate inlet form a circulating purification water path through pipelines, and the phosphate brine tank and the deionized water tank are connected to the buffer dosing tank through pipelines to form a dosing water path.

Description

Technical Field

[0001] This utility model relates to the field of cooling water, and in particular to a dosing device for bypass purification of a phosphate system in a nuclear power plant. 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] The following problems exist in the phosphate system of nuclear power plants: First, the suspended solids in the phosphate solution often exceed the standard, requiring frequent drainage and water replacement; second, current environmental protection requirements strictly control the discharge of phosphate solution, which requires purification treatment before it can be discharged in accordance with regulations, resulting in low work efficiency and exposing operators to higher radiation doses. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a dosing device after bypass purification of the phosphate system in a nuclear power plant.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A bypass purification and dosing device for a nuclear power plant phosphate system is constructed, comprising: a purification device connected to the outlet of the phosphate system for purifying suspended solids in the phosphate system; a phosphate salt tank for storing high-concentration phosphate; a deionized water tank for storing deionized water; a buffer dosing tank connected to the purification device, the phosphate salt tank, and the deionized water tank via pipelines; a first flow control valve installed in the pipeline connecting the phosphate salt tank and the buffer dosing tank; a second flow control valve installed in the pipeline connecting the deionized water tank and the buffer dosing tank; and a detection and control unit electrically connected to the first flow control valve and the second flow control valve. The phosphate system outlet, the purification device, the buffer dosing tank, and the phosphate inlet form a circulating purification water path through pipelines, and the phosphate salt tank and the deionized water tank are connected to the buffer dosing tank via pipelines to form a dosing water path.

[0006] Furthermore, the purification device 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 buffer dosing 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.

[0007] 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.

[0008] Furthermore, the pipeline between the secondary filter and the product water tank is equipped with a first switching valve and a second bypass branch pipe, the second bypass branch pipe being directly connected to the buffer dosing tank.

[0009] Furthermore, a second 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, and a third switching valve is provided on the third bypass branch pipe.

[0010] Furthermore, the first-stage filter is provided with a first drain pipe at the bottom, and the second-stage filter is provided with a second drain pipe at the bottom. The first drain pipe is provided with a first drain valve, and the second drain pipe is provided with a second drain valve. The first drain pipe and the second drain pipe are connected to the sewage tank.

[0011] Furthermore, the primary filter is equipped with a first hydraulic sensor, and the secondary filter is equipped with a second hydraulic sensor. The first hydraulic sensor and the second hydraulic sensor are electrically connected to the detection and control unit.

[0012] Furthermore, the pipeline between the primary filter and the outlet of the phosphate system is equipped with a third hydraulic sensor for detecting the pressure inside the pipeline, a temperature sensor for detecting the temperature inside the pipeline, a flow meter for detecting the flow rate of the liquid inside the pipeline, an electric valve for controlling the pipeline switch, and a pressure reducing valve for controlling the pressure of the liquid inside the pipeline. The third hydraulic sensor, the temperature sensor, the flow meter, the electric valve, and the pressure reducing valve are electrically connected to the detection and control unit.

[0013] Furthermore, the detection control unit includes a concentration detection sensor for detecting phosphate concentration, the concentration detection sensor being disposed on the pipeline between the purification device and the buffer dosing tank.

[0014] Furthermore, a mixing control valve for mixing liquids and controlling liquid flow is provided at the pipe connecting the buffer dosing tank and the phosphate system inlet, and the mixing control valve is electrically connected to the detection and control unit.

[0015] The present invention provides a bypass purification and dosing device for a nuclear power plant phosphate system, which has the following advantages: the phosphate system outlet delivers the raw solution to the purification device, the purification device filters the raw solution, and the purified liquid is transferred to the buffer dosing tank. The detection and control module controls the first flow control valve to output a high-concentration phosphate solution to the buffer dosing tank, and the detection and control module controls the second flow control valve to output deionized water to the buffer dosing tank. The deionized water reduces the high-concentration phosphate solution, so that the liquid in the buffer dosing tank meets the requirements of the phosphate system. This device filters suspended solids in the phosphate system and can adjust the phosphate concentration in the system, thereby improving the automation level of suspended solids purification and concentration control in the phosphate system. 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 piping diagram of a chemical dosing device after bypass purification in a nuclear power plant phosphate system according to one embodiment of this utility model; Figure 2 This is a pipeline diagram of a purification device for adding chemicals after bypass purification in a nuclear power plant phosphate system, according to one embodiment of this utility model.

[0017] Figure Labels 100. Phosphate system; 200. Purification device; 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. Third valve; 214. Primary vent valve; 220. Secondary filter; 221. Second hydraulic sensor; 222. Outlet valve; 223. Secondary vent valve; 224. Second valve; 225. Second drain valve; 226. Pressure relief valve; 230. Product Water tank; 231, level gauge; 232, drain valve; 240, return water pump; 241, return water flow valve; 242, return water switch valve; 261, first switch valve; 270, first bypass branch pipe; 271, turbidity and pH detector; 272, fourth switch valve; 273, fifth switch valve; 280, second bypass branch pipe; 290, first purified water circuit; 300, buffer dosing tank; 400, phosphate saline tank; 410, first flow control valve; 500, deionized water tank; 510, second flow control valve; 600, detection and control unit; 700, inlet valve. 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 2This invention illustrates a post-treatment dosing device for a phosphate system bypass in a nuclear power plant, according to one embodiment of the present invention. This device can be used for filtering suspended solids and controlling the concentration of phosphate solution within a phosphate system 100 in a nuclear power plant. It may include a purification device 200 connected to the outlet of the phosphate system 100 for purifying suspended solids, a phosphate brine tank 400 for storing high-concentration phosphate, a deionized water tank 500 for storing deionized water, and a buffer dosing tank connected via pipelines to the purification device 200, the phosphate brine tank 400, and the deionized water tank 500. 300, a first flow control valve 410 installed in the pipeline connecting the phosphate water tank 400 and the buffer dosing tank 300, a second flow control valve 510 installed in the pipeline connecting the deionized water tank 500 and the buffer dosing tank 300, and a detection and control unit 600 electrically connected to the first flow control valve 410 and the second flow control valve 510; wherein, the outlet of the phosphate system 100 and the purification device 200, the buffer dosing tank 300 and the phosphate inlet form a circulating purification water circuit through pipelines, and the phosphate water tank 400 and the deionized water tank 500 are connected to the buffer dosing tank 300 through pipelines to form a dosing water circuit.

[0021] The phosphate system 100 outlet delivers the raw solution to the purification device 200, which filters the raw solution. The purified liquid is then transferred to the buffer dosing tank 300. The detection and control module controls the first flow control valve 410 to output a high-concentration phosphate solution to the buffer dosing tank 300. The detection and control module also controls the second flow control valve 510 to output deionized water to the buffer dosing tank 300. The deionized water reduces the high-concentration phosphate solution, ensuring that the liquid in the buffer dosing tank 300 meets the requirements of the phosphate system 100. This process filters suspended solids in the phosphate system 100 and allows for adjustment of the phosphate concentration in the system, improving the automation level of suspended solids purification and concentration control in the phosphate system 100.

[0022] In one specific embodiment, an inlet valve 700 is provided at the inlet connection between the buffer dosing tank 300 and the phosphate system 100. The inlet valve 700 controls the flow rate of the mixed liquid entering the phosphate system 100 from the buffer dosing tank 300.

[0023] Furthermore, the detection control unit 600 controls the first flow control valve 410, the second flow control valve 510, and the inlet valve 700 to automatically detect and adjust the phosphate concentration in the system.

[0024] In one specific embodiment, the phosphate saline tank 400 and the deionized water tank 500 can be determined according to the actual ratio. For example, if the ratio of phosphate liquid to deionized water is 1:2, then the volume of the deionized water tank 500 is twice that of the phosphate saline tank 400. This avoids the situation where one tank runs out of liquid while the other does not, requiring multiple refilling operations.

[0025] Figure 2 The purification device 200, 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. The return water pump 240 is connected to the buffer dosing tank 300 via a pipe. The primary filter 210, the secondary filter 220, the product water tank 230, and the return water pump 240 form a first purified water path 290. After passing through the primary filter 210 and the secondary filter 220, the liquid from the phosphate system 100 passes through the primary filter 210 and the secondary filter 220, and the liquid after removing suspended particles then passes through the product water tank 230 and the return water pump 240 to the buffer dosing tank 300.

[0026] In one specific embodiment, the water production tank 230 is equipped with a level gauge 231 and a drain valve 232. The 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.

[0027] In one specific embodiment, a return water flow meter 204 is provided at the return water pump 240.

[0028] In one specific embodiment, the primary filter 210 is provided with a primary vent valve 214 on its upper part, and the secondary filter 220 is provided with a secondary vent valve 223 on its upper part.

[0029] Figure 2 The secondary filter 220 is shown in one embodiment. It may include a first bypass branch pipe 270 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 equipped with a turbidity meter 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.

[0030] In one specific embodiment, the turbidity meter and the pH meter are integrated into a single turbidity and pH meter 271.

[0031] In one specific embodiment, the pH range of the liquid is 11-13, and the turbidity is less than 1 NTU.

[0032] In one specific embodiment, the turbidity and pH detector 271 is equipped with a fourth switching valve 272 and a fifth switching valve 273 before and after the pipeline. The fourth switching valve 272 and the fifth 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 fourth switching valve 272 and the fifth switching valve 273 need to be opened only when necessary. Under normal circumstances, the fourth switching valve 272 and the fifth switching valve 273 are in the closed state.

[0033] 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.

[0034] Figure 2 The secondary filter 220 is shown in one embodiment. The pipeline between the secondary filter 220 and the product water tank 230 is provided with a first switching valve 261 and a second bypass branch pipe 280. The second bypass branch pipe 280 is directly connected to the buffer dosing tank 300. The second bypass branch pipe 280 can be used to return water to the buffer dosing tank 300 or to perform sampling and testing. The first switching valve 261 can close the pipeline between the secondary filter 220 and the product water tank 230, so that the liquid from the secondary filter 220 goes directly into the second bypass branch pipe 280.

[0035] Figure 2 In one embodiment, the primary filter 210 may include a second switching valve 224 between the primary filter 210 and the secondary filter 220, and a third bypass branch pipe connected to a second bypass branch pipe 280 between the primary filter 210 and the secondary filter 220. A third switching valve 213 is provided on the third bypass branch pipe. The second switching valve 224 can control the water flow between the primary filter 210 and the secondary filter 220. The third bypass branch pipe is directly connected to the second bypass branch pipe 280. The water filtered by the primary filter 210 is directly delivered to the second bypass branch pipe 280 for sampling and testing.

[0036] Figure 2 The diagram shows that in one embodiment, the primary filter 210 and the secondary filter 220 may include a first drain pipe at the bottom of the primary filter 210 and a second drain pipe at the bottom of the secondary filter 220. The first drain pipe is equipped with a first drain valve 212 and the second drain pipe is equipped with a second drain valve 225. The first drain pipe and the second drain pipe are connected to a sewage tank. After long-term use, the primary filter 210 and the secondary filter 220 will accumulate dirt, which can be discharged through the first drain pipe and the second drain pipe.

[0037] Figure 2The primary filter 210 is shown in one embodiment to include a first hydraulic sensor 211 and a secondary filter 220 to include a second hydraulic sensor 221. The first hydraulic sensor 211 and the second hydraulic sensing and detection control unit 600 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.

[0038] 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.

[0039] Figure 2 The primary filter 210, as shown in one embodiment, may include a pipeline between the primary filter 210 and the outlet of the phosphate system 100. This pipeline includes a third hydraulic sensor 201 for detecting pressure within the pipeline, a temperature sensor 202 for detecting temperature within the pipeline, a flow meter 204 for detecting the flow rate of the liquid within the pipeline, an electric valve 203 for controlling the pipeline's opening and closing, and a pressure reducing valve 205 for controlling the pressure of the liquid within 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 a detection control unit 600. The detection control unit 600 detects and controls the incoming liquid to the phosphate system 100 via the third hydraulic sensor 201, temperature sensor 202, flow meter 204, electric valve 203, and pressure reducing valve 205.

[0040] In one specific embodiment, when the pressure difference between the third hydraulic sensor 201 and the first hydraulic sensor 211 is greater than a specified value, the first filter needs to be replaced.

[0041] Figure 1 The detection control unit 600 shown in one embodiment may include a concentration detection sensor for detecting phosphate concentration, the concentration detection sensor being disposed on a pipe between the purification device 200 and the buffer dosing tank 300, the concentration detection sensor being capable of detecting liquid concentration.

[0042] Figure 1 The buffer dosing tank 300 is shown in one embodiment to include a mixing control valve at the pipe connecting the buffer dosing tank 300 to the inlet of the phosphate system 100 for mixing the liquid and controlling the liquid flow rate. The mixing control valve is electrically connected to the detection and control unit 600 and can control the mixing and flow rate of the liquid.

[0043] 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. A dosing device after bypass purification in a nuclear power plant phosphate system, the phosphate system (100) comprising an outlet and an inlet, characterized in that, include: A purification device (200) connected to the outlet of the phosphate system (100) and used to purify suspended solids in the phosphate system (100); a phosphate salt tank (400) for storing high-concentration phosphate; a deionized water tank (500) for storing deionized water; a buffer dosing tank (300) connected to the purification device (200), the phosphate salt tank (400), and the deionized water tank (500) via a pipeline; a first flow control valve (410) installed on the pipeline connecting the phosphate salt tank (400) and the buffer dosing tank (300); a second flow control valve (510) installed on the pipeline connecting the deionized water tank (500) and the buffer dosing tank (300); and a detection and control unit (600) electrically connected to the first flow control valve (410) and the second flow control valve (510); The outlet of the phosphate system (100) is connected to the purification device (200), the buffer dosing tank (300), and the phosphate inlet through a pipeline to form a circulating purification water path. The phosphate water tank (400) and the deionized water tank (500) are connected to the buffer dosing tank (300) through a pipeline to form a dosing water path.

2. The dosing device after bypass purification in a nuclear power plant phosphate system according to claim 1, characterized in that, The purification device (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 buffer dosing tank (300) 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).

3. The dosing device after bypass purification in a nuclear power plant phosphate system according to claim 2, 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.

4. The dosing device after bypass purification in a nuclear power plant phosphate system according to claim 3, characterized in that, The pipeline between the secondary filter (220) and the product water tank (230) is provided with a first switch valve (261) and a second bypass branch pipe (280), and the second bypass branch pipe (280) is directly connected to the buffer dosing tank (300).

5. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 4, characterized in that, A second 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 third switching valve (213) is provided on the third bypass branch pipe.

6. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 2, characterized in that, The first-stage filter (210) is provided with a first sewage pipe at the bottom, and the second-stage filter (220) is provided with a second sewage pipe at the bottom. The first sewage pipe is provided with a first sewage switch valve (212), and the second sewage pipe is provided with a second sewage switch valve (225). The first sewage pipe and the second sewage pipe are connected to the sewage tank.

7. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 2, characterized in that, 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 sensor are electrically connected to the detection control unit (600).

8. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 2, characterized in that, 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), the temperature sensor (202), the flow meter (204), the electric valve (203), and the pressure reducing valve (205) are electrically connected to the detection control unit (600).

9. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 1, characterized in that, The detection control unit (600) includes a concentration detection sensor for detecting phosphate concentration, which is disposed on the pipeline between the purification device (200) and the buffer dosing tank (300).

10. A dosing device for bypass purification of a nuclear power plant phosphate system according to claim 1, characterized in that, The pipe connecting the buffer dosing tank (300) to the inlet of the phosphate system (100) is equipped with a mixing control valve for mixing the liquid and controlling the liquid flow rate. The mixing control valve is electrically connected to the detection control unit (600).

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