A containment negative pressure measurement reference end stabilizing device for nuclear power plants

Abstract

This application belongs to the field of nuclear power operation technology, specifically relating to a pressure stabilizing device for a containment negative pressure measurement reference end in a nuclear power plant. The device includes: a mesh filter, an air filter, a solenoid valve, a first buffer tank, an electrically controlled regulating valve, and a straight-through connector, all connected sequentially. The other end of the solenoid valve is also connected to the straight-through connector via a second buffer tank. The device consists of a main circuit and a bypass circuit, enabling multi-stage coordinated operation and dynamic adjustment. Even under severe external turbulence, the pressure value at the measurement end remains within the threshold range. The device's buffering and filtering capacity remains normal even if the solenoid valve or the electrically controlled regulating valve fails.

Description

Technical Field

[0001] This application belongs to the field of nuclear power operation technology, specifically relating to a containment negative pressure measurement reference terminal stabilization device for nuclear power plants. Background Technology

[0002] The reference terminal of the containment negative pressure measuring instrument in a certain nuclear power plant lacks measures to mitigate pressure fluctuations in its installation design. When measuring the containment negative pressure, it is affected by disturbances (such as strong winds, the start of seawater pumps in the room, etc.), which causes measurement errors and disturbances. This can lead to the unit entering unplanned operating restrictions (LCO) conditions beyond the limits specified in the operating technical specifications. Summary of the Invention

[0003] The purpose of this application is to provide a pressure stabilizing device for the reference end of containment negative pressure measurement in nuclear power plants, which solves the problem of measurement errors and disturbances caused by the influence of turbulence during containment negative pressure measurement, and reduces the number of unplanned LCO entries of the unit caused by pressure fluctuations at the instrument reference end during containment negative pressure measurement.

[0004] The technical solution to achieve the purpose of this application is as follows:

[0005] This application provides a pressure stabilizing device for a containment negative pressure measurement reference terminal in a nuclear power plant. The device includes: a mesh filter, an air filter, a solenoid valve, a first buffer tank, an electric regulating valve, and a straight-through connector connected one by one.

[0006] The other end of the solenoid valve is also connected to a straight connector via a second buffer tank.

[0007] Optionally, the solenoid valve is a two-position three-way solenoid valve.

[0008] Optionally, the device further includes: a backup circuit;

[0009] The two ends of the backup circuit are connected to the rear ends of the first and second buffer tanks, respectively; a manual shut-off valve is connected in series on the backup circuit, and the third buffer tank is connected in series on the backup circuit via a quick connector.

[0010] Optionally, the device further includes: a first tee connector and a second tee connector;

[0011] The first tee connector is connected in series between the mesh filter and the air filter;

[0012] The second three-way connector is connected in series between the electric regulating valve and the straight connector.

[0013] Optionally, the device further includes: a data acquisition device and a control system;

[0014] The data acquisition device includes: an inlet pressure sensor and an outlet pressure sensor;

[0015] The inlet pressure sensor and the outlet pressure sensor are connected to the first tee connector and the second tee connector, respectively, to detect the inlet pressure and the outlet pressure.

[0016] The control system includes: control relays and data acquisition controllers;

[0017] The data acquisition controller is connected to the inlet and outlet air pressure sensors. Based on the inlet and outlet air pressures, it sends excitation signals to the solenoid valve and electric regulating valve opening degree via a control relay.

[0018] Optionally, the device further includes: a 220V switching power supply and a 24V switching power supply;

[0019] 220V and 24V switching power supplies provide suitable power for the data acquisition device and control system.

[0020] Optionally, the inlet and outlet pressure sensors are connected to the first and second tee connectors using silicone tubing.

[0021] The beneficial technical effects of this application are as follows:

[0022] 1) This application provides a containment negative pressure measurement reference end stabilization device for nuclear power plants. By constructing a containment negative pressure reference end trend model, it achieves multi-point pressure reference measurement. The main equipment buffer device sets measurement reference points at the pressure inlet and buffer pipeline outlet to measure data changes in real time. Distributed independent offline parameter measurement point devices are set at the locations where reference points need to be set (such as near relevant alarm instruments, measurement channel factor influence points, etc.). These sensing components feed back data to the data acquisition controller through three transmission methods. This ensures multiple redundancy of data sources and prevents real-time data gaps. The feedback methods are: one is analog quantity acquisition, another is industrial RS232 digital quantity communication, and the third is distributed offline data, forming a large amount of basic data over a long period of time marked by time points. This data information is restored to its original state by the host computer software using big data analysis methods, forming trend analysis related graphs, establishing a complete reference limit trend curve, learning these historical trend curves, fitting a reasonable threshold system, and realizing intelligent adjustment of limits for multiple situations by the data acquisition controller.

[0023] 2) This application provides a containment negative pressure measurement reference terminal stabilization device for nuclear power plants. The data acquisition and control module realizes pressure acquisition, temperature acquisition, alarm output, 4-20mA remote pressure feedback, and valve adjustment functions. The buffer filtration device consists of a main circuit and a bypass circuit, and can achieve multi-level coordinated operation and dynamic adjustment. When there is severe external turbulence, the gas pressure value at the measuring end still fluctuates within the threshold. When the solenoid valve or electric regulating valve fails, the device's buffer filtration capacity remains normal. A power-off data protection function is implemented, and the data acquisition equipment can be delayed for 4 hours after automatic power failure. The entire structure is compact, easy to install, and the modular design of the components facilitates maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a containment negative pressure measurement reference terminal stabilizing device for nuclear power plants, provided in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of another containment negative pressure measurement reference terminal stabilizing device for nuclear power plants provided in an embodiment of this application.

[0026] In the picture:

[0027] 1. Mesh filter; 2-1. First tee connector; 2-2. Second tee connector; 3. Air filter; 4. Solenoid valve; 5-1. First buffer tank; 5-2. Second buffer tank; 5-3. Third buffer tank; 6. Control relay; 7. Electric regulating valve; 8. Quick connector; 9. Manual shut-off valve; 10. 24V switching power supply; 11. Inlet air pressure sensor; 12. Data acquisition controller; 13. 220V switching power supply; 14. Outlet air pressure sensor; 15. Straight-through connector. Detailed Implementation

[0028] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] See Figure 1 and Figure 2 The embodiment of this application provides a pressure stabilizing device for a containment negative pressure measurement reference terminal in a nuclear power plant, comprising: a mesh filter 1, an air filter 3, a solenoid valve 4, a first buffer tank 5-1, an electric regulating valve 7, and a straight connector 15 connected one by one;

[0030] The other end of the solenoid valve 4 is also connected to the straight connector 15 via the second buffer tank 5-2.

[0031] The mesh filter 1 can significantly dampen disturbances in external air pressure. The air filter 3, along with the first buffer tank 5-1 and the second buffer tank 5-2, can mitigate wind disturbances within the pipeline and stabilize the pipeline air pressure. The mesh filter 1, air filter 2, and the first buffer tank 5-1 and the second buffer tank 5-2 can achieve multi-stage coordinated operation in series.

[0032] External disturbance airflow through the complete pipeline consists of a mesh filter 1, an air filter 3, a solenoid valve 4, a first buffer tank 5-1, an electric regulating valve 7, and a straight connector 15. They are connected by seamless steel pipes and compression fittings. The entire airflow path is sealed along the way. The solenoid valve 4 controls the flow of the main path and prevents insufficient flow of the regulating valve in the main path and prevents the main path from becoming blocked after a failure. The automatic regulating branch formed by the first buffer tank 5-1 and the electric regulating valve 7 and the separate branch formed by the second buffer tank 5-2 are physically parallel and logically inverse and complementary.

[0033] In one example, solenoid valve 4 is a two-position three-way solenoid valve.

[0034] In some possible implementations of the embodiments of this application, the device further includes: a backup circuit;

[0035] The two ends of the backup circuit are connected to the rear ends of the first buffer tank 5-1 and the second buffer tank 5-2, respectively; a manual shut-off valve 9 is connected in series on the backup circuit, and the third buffer tank 5-3 is connected in series on the backup circuit through a quick connector 8.

[0036] The backup circuit and the electric regulating valve 7 are in parallel in terms of architecture, and their logical relationship is complementary and redundant. They serve as backup channels in case of unexpected situations (such as after the equipment loses power completely), achieving triple redundancy while ensuring the flow buffering capacity of the main circuit and the parallel circuit.

[0037] In one example, the device further includes: a first tee connector 2-1 and a second tee connector 2-2;

[0038] The first tee connector 2-1 is connected in series between the mesh filter 1 and the air filter 3;

[0039] The second three-way connector 2-2 is connected in series between the electric regulating valve 7 and the straight connector 15.

[0040] Based on the energized state of solenoid valve 4, the pipeline can be divided into two cases:

[0041] 1. Solenoid valve 4 is always energized. At this time, it is the main air pressure pipeline, which is in the following order: mesh filter 1 → first tee connector 2-1 → air filter 3 → solenoid valve 4 → first buffer tank 5-1 → electric regulating valve 7 → second tee connector 2-2 → straight connector 15.

[0042] In addition, the quick connector 8, the third buffer tank 5-3, and the manual shut-off valve 9 form a bypass. In case of an accident with the electric regulating valve 7 (such as full closure), the filter and pressure regulation can be manually switched on.

[0043] 2. When solenoid valve 4 loses power, the backup air pressure pipeline is in sequence: mesh filter 1 → first tee connector 2-1 → air filter 3 → solenoid valve 4 → second buffer tank 5-2 → second tee connector 2 → straight connector 15.

[0044] In some possible implementations of the embodiments of this application, the apparatus further includes: a data acquisition device and a control system;

[0045] The data acquisition device includes: an inlet pressure sensor 11 and an outlet pressure sensor 14;

[0046] The inlet pressure sensor 11 and the outlet pressure sensor 14 are respectively connected to the first tee connector 2-1 and the second tee connector 2-2 to detect the inlet pressure and the outlet pressure.

[0047] The control system includes: a control relay 6 and a data acquisition controller 12;

[0048] The data acquisition controller 12 is connected to the inlet pressure sensor 11 and the outlet pressure sensor 14. Based on the inlet and outlet pressures, it sends opening excitation signals to the solenoid valve 4 and the electric regulating valve 7 via the control relay 6.

[0049] In one example, the device further includes: a 220V switching power supply 13 and a 24V switching power supply 10;

[0050] The 220V switching power supply 13 and the 24V switching power supply 10 provide suitable power for the data acquisition device and the control system.

[0051] As an example, the inlet pressure sensor 11 and the outlet pressure sensor 14 are connected to the first tee connector 2-1 and the second tee connector 2-2 using silicone tubing, while the remaining devices are connected using stainless steel tubing.

[0052] When the containment negative pressure reference end stabilizing device is working normally, solenoid valve 4 is energized. Data acquisition controller 12 compares the measured values ​​of inlet pressure sensor 11 and outlet pressure transmitter 14 and sends an opening excitation signal to electric regulating valve 7. The valve position response of electric regulating valve 7 is fed back to data acquisition controller 12. At the same time, relevant pressure measurements and control feedback signals are recorded and saved by data acquisition controller. All components work together to buffer external pressure fluctuations and stabilize the terminal pressure value. The signals of control relay 6, data acquisition controller 12, inlet pressure sensor 11, and outlet pressure transmitter 14 are isolated from each other and do not interfere with each other.

[0053] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.

Claims

1. A containment negative pressure measurement reference terminal stabilizing device for nuclear power plants, characterized in that, The device includes: a mesh filter (1), an air filter (3), a solenoid valve (4), a first buffer tank (5-1), an electric regulating valve (7), and a straight connector (15) connected one by one. The other end of the solenoid valve (4) is also connected to the straight connector (15) via the second buffer tank (5-2); The mesh filter (1) is used to significantly dampen the disturbance of external air pressure; the air filter (3) and the first buffer tank (5-1) and the second buffer tank (5-2) are used to alleviate the disturbance of wind force in the pipeline and stabilize the pipeline air pressure; the solenoid valve (4) is used to control the flow of the main road and prevent the main road from being blocked due to insufficient flow of the regulating valve in the main road and failure of the main road. The automatic regulating branch formed by the first buffer tank (5-1) and the electric regulating valve (7) and the second buffer tank (5-2) are in parallel in physical architecture and inversely complementary in logical relationship.

2. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to claim 1, characterized in that, The solenoid valve (4) is a two-position three-way solenoid valve.

3. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to claim 1, characterized in that, The device further includes: a backup circuit; The two ends of the backup circuit are connected to the rear ends of the first buffer tank (5-1) and the second buffer tank (5-2) respectively; a manual shut-off valve (9) is connected in series on the backup circuit, and the third buffer tank (5-3) is connected in series on the backup circuit through a quick connector (8).

4. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to any one of claims 1-3, characterized in that, The device further includes: a first tee connector (2-1) and a second tee connector (2-2); The first tee connector (2-1) is connected in series between the mesh filter (1) and the air filter (3); The second three-way connector (2-2) is connected in series between the electric regulating valve (7) and the straight connector (15).

5. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to claim 4, characterized in that, The device also includes: a data acquisition device and a control system; The data acquisition device includes: an inlet pressure sensor (11) and an outlet pressure sensor (14). The inlet pressure sensor (11) and the outlet pressure sensor (14) are connected to the first tee connector (2-1) and the second tee connector (2-2) respectively, and are used to detect the inlet pressure and the outlet pressure. The control system includes: a control relay (6) and a data acquisition controller (12). The data acquisition controller (12) is connected to the inlet pressure sensor (11) and the outlet pressure sensor (14). Based on the inlet and outlet pressures, it sends opening excitation signals to the solenoid valve (4) and the electric regulating valve (7) via the control relay (6).

6. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to claim 5, characterized in that, The device further includes: a 220V switching power supply (13) and a 24V switching power supply (10). The 220V switching power supply (13) and the 24V switching power supply (10) provide suitable power for the data acquisition device and the control system.

7. The containment negative pressure measurement reference terminal stabilizing device for nuclear power plants according to claim 5, characterized in that, The inlet pressure sensor (11) and outlet pressure sensor (14) are connected to the first tee connector (2-1) and the second tee connector (2-2) using silicone tubing.

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