Zinc concentration control device with primary-loop zinc addition

Abstract

This invention discloses a zinc concentration control device for primary loop zinc addition, relating to the field of nuclear reactor coolant treatment technology. The invention includes a loop pipe with a monitoring component installed on its inner wall. An injection pipe is connected to one side of the top of the loop pipe, and a housing is fixedly connected to the top of the injection pipe. A flow control component is installed inside the housing. This invention forms a three-level distributed detection network—an inlet section, a middle section, and an outlet section—through a micro ion chromatography detection module. This network can collect zinc concentration gradient data in real time, achieving comprehensive monitoring of zinc concentration changes. When the zinc concentration is detected to be rising close to a threshold, the control mechanism can quickly start a motor, driving an adjusting disc to rotate. By adjusting the offset between the adjusting disc and the arc-shaped opening on the surface of the fixed disc, the injection volume of depleted zinc acetate solution is precisely reduced, thereby effectively controlling the zinc concentration in the loop and ensuring that the zinc concentration is maintained within a suitable range.

Description

Technical Field

[0001] This invention belongs to the field of nuclear reactor coolant treatment technology, and in particular relates to a zinc concentration control device for primary circuit zinc addition. Background Technology

[0002] In nuclear power plant operation, the primary loop zinc addition technology, by adding zinc acetate solution to the coolant, can effectively reduce radiation dose and alleviate stress corrosion cracking of system pipelines.

[0003] However, the control of zinc concentration in existing technologies mainly relies on manual timed sampling and detection or offline analysis at a single detection point, which has significant drawbacks: First, traditional detection methods cannot achieve real-time monitoring, making it difficult to detect transient changes in zinc concentration (such as concentration exceeding the limit caused by fluctuations in unit power or changes in operating conditions) in a timely manner, which can easily lead to zinc deposition or system stability problems; Second, the flow rate adjustment of zinc injection pumps mostly depends on manual operation, which has a delayed response and insufficient accuracy, making it difficult to avoid the risk of concentration exceeding the limit.

[0004] To address these issues, we have provided a zinc concentration control device with a single-loop zinc addition system. Utility Model Content

[0005] The purpose of this invention is to provide a zinc concentration control device for a single-loop zinc addition system. By combining the monitoring component and the flow control component, it solves the problem that the control of zinc concentration in the prior art mainly relies on manual timed sampling and detection or offline analysis of a single detection point, which not only cannot monitor in real time, but also has a lag in manual operation response.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a zinc concentration control device for a single-loop zinc addition system, comprising a loop tube, a monitoring component disposed on the inner wall of the loop tube, an injection tube connected to one side of the top of the loop tube, a housing fixedly connected to the top of the injection tube, a flow control component disposed within the inner cavity of the housing, a pressure sensor fixedly connected to one side of the inner cavity of the housing, the flow control component including a motor fixedly connected to the top of the housing, a movable rod fixedly connected to the output end of the motor, an adjusting plate fixedly connected to the bottom of the movable rod, a partition fixedly connected to the bottom of the inner cavity of the housing, a fixed plate fixedly connected to the top of the partition, and arc-shaped openings on the surfaces of the adjusting plate and the fixed plate, the monitoring component including a micro ion chromatography detection module fixedly connected to the inner wall of the loop tube, an injection port disposed on one side of the micro ion chromatography detection module, and a horizontal tube fixedly connected to one side of the micro ion chromatography detection module.

[0008] The present invention is further configured such that a connecting pipe is fixedly connected to one side of the housing, and a zinc injection pump is fixedly connected to one end of the connecting pipe via a flange. The zinc injection pump is specifically designed for the production of zinc acetate solution, and draws the zinc acetate solution into the inner cavity of the sealed cylinder. The zinc injection pump is installed using a flange bolt structure, which facilitates disassembly and maintenance.

[0009] The present invention is further configured such that a capillary tube is provided at the bottom of the micro ion chromatography detection module, one end of which extends to the outside of the loop tube. The waste liquid after detection in the inner cavity of the micro ion chromatography detection module is discharged into a centralized recovery tank through the capillary tube at the bottom of the module to avoid secondary pollution.

[0010] The present invention is further configured such that a mounting plate is fixedly connected to one side of the housing, a mounting groove is provided on one side of the top of the mounting plate, a mounting block is movably connected to the inner cavity of the mounting groove, a fastening bolt is provided on one side of the front of the mounting plate, the top of the mounting block is fixedly connected to the bottom of the zinc injection pump, and the fastening bolt is screwed until one end is screwed into the inner cavity of the mounting block, thereby fixing the zinc injection pump on the top of the mounting plate and facilitating subsequent disassembly.

[0011] The present invention is further configured such that a sealing ring is fixedly connected to the edge of the top of the adjusting plate, and a sealing cylinder is fixedly connected to the top of the partition. The outer side of the sealing ring contacts the inner wall of the sealing cylinder. The sealing ring is set on the surface of the adjusting plate, which can greatly improve the sealing performance between the surface of the adjusting plate and the inner wall of the sealing cylinder and prevent solution leakage.

[0012] The present invention is further configured such that one end of the zinc injection pump is provided with a connector, one end of the connector is fixedly connected to an installation plate, and one side of the installation plate is fixedly connected to a sealing ring. One end of the external liquid supply pipeline can be connected to the connector at one end of the zinc injection pump through the same installation plate, and the connection method is simple.

[0013] The present invention is further provided that a sealing cover is provided on the front side of the housing, and a sealing strip is fixedly connected to the edge of the surface of the sealing cover. The sealing cover can seal the inner cavity of the housing, and the sealing cover is easy to disassemble. After disassembly, the components in the inner cavity of the housing can be inspected and maintained.

[0014] The present invention is further configured such that a mounting bracket is fixedly connected to the top of the housing, and the top of the inner cavity of the mounting bracket is fixedly connected to the base of the motor. The mounting bracket can fix the base of the motor and reduce the probability of the motor being interfered with by external forces.

[0015] The present invention has the following beneficial effects.

[0016] 1. This utility model forms a three-level distributed detection network through a micro ion chromatography detection module: inlet section, middle section and outlet section, which can collect zinc concentration gradient data in real time and realize comprehensive monitoring of zinc concentration changes. When the zinc concentration is detected to be rising close to the threshold, the control mechanism can quickly start the motor to drive the adjustment plate to rotate. By adjusting the degree of misalignment between the arc-shaped opening on the surface of the adjustment plate and the fixed plate, the injection volume of the depleted zinc acetate solution is precisely reduced, thereby effectively controlling the zinc concentration in the loop and ensuring that the zinc concentration is maintained within a suitable range.

[0017] 2. This utility model is equipped with a pressure sensor, which can monitor the pressure inside the sealed cylinder in real time. When the pressure inside the sealed cylinder rises due to the continuous injection of depleted zinc acetate solution by the zinc injection pump and reaches the set value, the control mechanism will shut down the zinc injection pump in time, effectively preventing damage to the device and related system components due to excessive pressure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a three-dimensional diagram of a zinc concentration control device with a primary zinc supply loop.

[0020] Figure 2 This is a cross-sectional schematic diagram of a zinc concentration control device for primary-loop zinc addition.

[0021] Figure 3 Zinc concentration control device for primary-loop zinc addition Figure 2 A magnified view of a portion of point A in the middle.

[0022] Figure 4 This is a schematic diagram of the internal structure of the sealed cylinder in a zinc concentration control device for primary zinc addition.

[0023] Figure 5 This is a schematic diagram of the flow control component in a zinc concentration control device with a primary-loop zinc injection system. In the attached diagram: 1. Loop pipe; 2. Monitoring component; 3. Injection pipe; 4. Housing; 5. Flow control component; 6. Pressure sensor; 501. Motor; 502. Movable rod; 503. Adjustment disc; 504. Partition plate; 505. Fixed disc; 506. Arc-shaped port; 201. Micro ion chromatography detection module; 202. Sample inlet; 203. Horizontal tube; 7. Connecting pipe; 8. Zinc injection pump; 9. Mounting plate; 10. Sealing ring; 11. Sealing cylinder. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 This utility model is a zinc concentration control device for a single-loop zinc addition system, including a loop pipe 1. A monitoring component 2 is installed on the inner wall of the loop pipe 1. An injection pipe 3 is connected to one side of the top of the loop pipe 1. A housing 4 is fixedly connected to the top of the injection pipe 3. A flow control component 5 is installed inside the housing 4. A pressure sensor 6 is fixedly connected to one side of the inner cavity of the housing 4. The flow control component 5 includes a motor 501, which is fixedly connected to the top of the housing 4. A movable rod 502 is fixedly connected to the output end of the motor 501. The bottom of the movable rod 502 is fixedly connected to... An adjustment plate 503 is fixedly connected to the bottom of the inner cavity of the housing 4, a partition plate 504 is fixedly connected to the top of the partition plate 504, and a fixed plate 505 is fixedly connected to the top of the partition plate 504. Both the adjustment plate 503 and the fixed plate 505 have arc-shaped openings 506 on their surfaces. The monitoring component 2 includes a micro ion chromatography detection module 201, which is fixedly connected to the inner wall of the loop tube 1. An inlet 202 is provided on one side of the micro ion chromatography detection module 201, and a horizontal tube 203 is fixedly connected to one side of the micro ion chromatography detection module 201.

[0027] Specifically: The zinc injection pump 8 is turned on, and the zinc injection pump 8 draws the depleted zinc acetate solution into the inner cavity of the sealed cylinder 11. The solution flows into the inner cavity of the loop pipe 1 through the arc-shaped opening 506 on the surface of the adjusting plate 503 and the fixed plate 505. The micro ion chromatography detection module 201 forms a three-level distributed detection network: inlet section, middle section and outlet section, and collects zinc concentration gradient data in real time. When the zinc concentration is detected to be rising close to the threshold, the control mechanism starts the motor 501. The output end of the motor 501 drives the movable rod 502 to rotate. The movable rod 502 drives the adjusting plate 503 to rotate. As the adjusting plate 503 rotates, the arc-shaped opening 506 on its surface gradually shifts away from the arc-shaped opening 506 on the surface of the fixed plate 505, and the arc-shaped opening 506 becomes smaller and smaller, thereby reducing the injection volume of the depleted zinc acetate solution.

[0028] Example 2

[0029] Please see Figure 1-5Based on Embodiment 1, a connecting pipe 7 is fixedly connected to one side of the housing 4. One end of the connecting pipe 7 is fixedly connected to a zinc injection pump 8 via a flange. A capillary tube is provided at the bottom of the micro ion chromatography detection module 201, with one end of the capillary tube extending to the outside of the loop pipe 1. A mounting plate 9 is fixedly connected to one side of the housing 4. A mounting groove is provided on one side of the top of the mounting plate 9, and a mounting block is movably connected to the inner cavity of the mounting groove. A fastening bolt is provided on one side of the front of the mounting plate 9. The top of the mounting block is fixedly connected to the bottom of the zinc injection pump 8. A sealing ring 10 is fixedly connected to the top edge of the section plate 503, and a sealing cylinder 11 is fixedly connected to the top of the partition plate 504. The outer side of the sealing ring 10 contacts the inner wall of the sealing cylinder 11. A connector is provided at one end of the zinc injection pump 8, and a mounting plate is fixedly connected to one end of the connector. A sealing ring is fixedly connected to one side of the mounting plate. A sealing cover is provided on the front of the housing 4, and a sealing strip is fixedly connected to the edge of the surface of the sealing cover. A mounting bracket is fixedly connected to the top of the housing 4, and the top of the inner cavity of the mounting bracket is fixedly connected to the base of the motor 501.

[0030] Specifically: The zinc injection pump 8 is designed for the depletion of zinc acetate solution, drawing the solution into the inner cavity of the sealed cylinder 11. The zinc injection pump 8 is installed using a flange bolt structure for easy disassembly and maintenance. Waste liquid from the micro ion chromatography detection module 201 is discharged into a centralized recovery tank through a capillary tube at the bottom of the module, preventing secondary pollution. Tightening the fastening bolts until one end is screwed into the inner cavity of the mounting block secures the zinc injection pump 8 to the top of the mounting plate 9, facilitating subsequent disassembly. The sealing ring 10 is located on the surface of the adjusting plate 503, greatly improving the seal between the surface of the adjusting plate 503 and the inner wall of the sealed cylinder 11, preventing solution leakage. One end of the external liquid supply pipe can be connected to the connector at one end of the zinc injection pump 8 via the same mounting plate, a simple connection method. The sealing cover seals the inner cavity of the housing 4 and is easily disassembled, allowing for inspection and maintenance of the components within the housing 4. The mounting bracket secures the base of the motor 501 and reduces the probability of external interference to the motor 501.

[0031] The working principle of this utility model is as follows: Connect one end of the zinc injection pump 8 to the external liquid supply pipeline, turn on the zinc injection pump 8, and the zinc injection pump 8 draws the depleted zinc acetate solution into the inner cavity of the sealed cylinder 11. The solution flows into the inner cavity of the loop pipe 1 through the arc-shaped opening 506 on the surface of the adjusting plate 503 and the fixed plate 505. The micro ion chromatography detection module 201 forms a three-level distributed detection network: inlet section, middle section and outlet section, and collects zinc concentration gradient data in real time. When the zinc concentration rises and approaches the threshold, the control mechanism starts the motor 501. The output end of 01 drives the movable rod 502 to rotate, and the movable rod 502 drives the adjusting plate 503 to rotate. As the adjusting plate 503 rotates, the arc-shaped opening 506 on its surface gradually shifts away from the arc-shaped opening 506 on the surface of the fixed plate 505, and the arc-shaped opening 506 becomes smaller and smaller, thereby reducing the injection volume of the depleted zinc acetate solution. Since the zinc injection pump 8 continuously injects the depleted zinc acetate solution, the pressure inside the sealing cylinder 11 will increase. After the pressure sensor 6 detects that the pressure value inside the sealing cylinder 11 has reached the set value, the control mechanism shuts down the zinc injection pump 8.

[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A device for controlling the concentration of zinc in a primary circuit with zinc addition, comprising a circuit pipe (1), characterised in that: The inner wall of the loop pipe (1) is provided with a monitoring component (2), and one side of the top of the loop pipe (1) is connected to an injection pipe (3). The top of the injection pipe (3) is fixedly connected to a housing (4). The inner cavity of the housing (4) is provided with a flow control component (5), and one side of the inner cavity of the housing (4) is fixedly connected to a pressure sensor (6). The flow control component (5) includes a motor (501), which is fixedly connected to the top of the housing (4). A movable rod (502) is fixedly connected to the output end of the motor (501). An adjustment plate (503) is fixedly connected to the bottom of the movable rod (502). A partition plate (504) is fixedly connected to the bottom of the inner cavity of the housing (4). A fixed plate (505) is fixedly connected to the top of the partition plate (504). An arc-shaped opening (506) is provided on the surface of both the adjustment plate (503) and the fixed plate (505). The monitoring component (2) includes a micro ion chromatography detection module (201), which is fixedly connected to the inner wall of the loop tube (1). An injection port (202) is provided on one side of the micro ion chromatography detection module (201), and a horizontal tube (203) is fixedly connected to one side of the micro ion chromatography detection module (201).

2. The device for controlling the concentration of zinc in a zinc-dosed primary circuit according to claim 1, characterized in that: A connecting pipe (7) is fixedly connected to one side of the housing (4), and a zinc injection pump (8) is fixedly connected to one end of the connecting pipe (7) through a flange.

3. The device for controlling the concentration of zinc in a zinc-added primary circuit according to claim 1, characterized in that: The bottom of the micro ion chromatography detection module (201) is provided with a capillary tube, one end of which extends through to the outside of the loop tube (1).

4. The zinc concentration control device for primary-loop zinc addition according to claim 1, characterized in that: A mounting plate (9) is fixedly connected to one side of the housing (4). A mounting groove is provided on one side of the top of the mounting plate (9). A mounting block is movably connected to the inner cavity of the mounting groove. A fastening bolt is provided on one side of the front of the mounting plate (9). The top of the mounting block is fixedly connected to the bottom of the zinc injection pump (8).

5. The device for controlling the concentration of zinc in a zinc- spiked primary circuit according to claim 1, characterized in that: A sealing ring (10) is fixedly connected to the top edge of the adjusting plate (503), and a sealing cylinder (11) is fixedly connected to the top of the partition (504). The outer side of the sealing ring (10) is in contact with the inner wall of the sealing cylinder (11).

6. The device for controlling the concentration of zinc in a zinc-dosed primary circuit according to claim 2, characterized in that: One end of the zinc injection pump (8) is provided with a connector, one end of which is fixedly connected to an installation plate, and one side of the installation plate is fixedly connected to a sealing ring.

7. The device for controlling the concentration of zinc in a zinc- spiked primary circuit according to claim 1, characterized in that: The front of the housing (4) is provided with a sealing cover plate, and a sealing strip is fixedly connected to the edge of the surface of the sealing cover plate.

8. The device for controlling the concentration of zinc in a zinc- spiked primary circuit according to claim 1, characterized in that: The top of the housing (4) is fixedly connected to a mounting bracket, and the top of the inner cavity of the mounting bracket is fixedly connected to the base of the motor (501).

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