Water filling and exhaust system for nuclear power SEBIM safety valve

Abstract

The utility model discloses a nuclear power SEBIM safety valve water filling and exhaust system which comprises a water tank, a water tank water filling module and a drainage module, the water tank water filling module comprises a water inlet, an electromagnetic valve V1 and a water tank liquid level sensor, the electromagnetic valve V1 is arranged between the water inlet and the water tank, the water tank liquid level sensor is arranged on the water tank, and the drainage module comprises a booster pump, an electromagnetic valve V2 and a water pressure sensor. The booster pump and the electromagnetic valve V2 are sequentially arranged, the water pressure sensor is located between the booster pump and the electromagnetic valve V2, the booster pump is connected with a back pressure adjusting valve in parallel, the rear end of the electromagnetic valve V2 is sequentially connected with the control cabinet and the main valve, the rear end of the main valve is connected with the electromagnetic valve V3 and the ball valve, the rear end of the ball valve is connected with the water tank, and the electromagnetic valve V3 is further connected with the PRE funnel so as to be communicated with a drainage and exhaust system. The method does not depend on manual experience any more, operation is easy, efficiency is improved, manual operation dosage is reduced, and the automation degree is improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power SEBIM safety valve technology, specifically to a nuclear power SEBIM safety valve water filling and venting system. Background Technology

[0002] SEBIM safety valves are pilot-operated safety valves primarily used in three systems of megawatt-class nuclear power plants: RCP, RPA, and RCV, all of which are critical and sensitive equipment for unit operation. The main valve and control cabinet of the SEBIM safety valve may be separately arranged, requiring water filling, venting, and related tests during maintenance. This work is complex, with low automation and complicated operation, easily leading to human error and operational risks. In particular, water filling and venting are still performed manually, relying on the operator's experience, resulting in low efficiency and a high degree of manual intervention.

[0003] Therefore, this patent application is filed. Utility Model Content

[0004] The purpose of this invention is to provide a water filling and venting system for nuclear power SEBIM safety valves, which solves the problems of high manual operation dosage and low water filling and venting efficiency of existing SEBIM safety valves.

[0005] This utility model is achieved through the following technical solution:

[0006] The purpose of this utility model is to provide a nuclear power SEBIM safety valve water filling and venting system, including a water tank, a water tank filling module, and a drainage module. The water tank filling module includes a water inlet, a solenoid valve V1, and a water tank level sensor. The solenoid valve V1 is located between the water inlet and the water tank, and the water tank level sensor is located on the water tank. The drainage module includes a booster pump, a solenoid valve V2, and a water pressure sensor. The booster pump and the solenoid valve V2 are arranged in sequence, and the water pressure sensor is located between the booster pump and the solenoid valve V2. The booster pump is connected in parallel with a back pressure regulating valve. The rear end of the solenoid valve V2 is connected in sequence to a control cabinet and a main valve. The rear end of the main valve is connected to a solenoid valve V3 and a ball valve. The rear end of the ball valve is connected to the water tank. The solenoid valve V3 is also connected to a PRE funnel to connect to the condensate venting system.

[0007] In an optional embodiment, a filter F1 is provided between the solenoid valve V1 and the water tank, and a filter F2 is provided between the solenoid valve V2 and the control cabinet.

[0008] In an optional embodiment, both filter F1 and filter F2 are equipped with differential pressure sensors.

[0009] In an optional embodiment, a flow meter is provided between the filter F2 and the solenoid valve V2.

[0010] In an optional embodiment, the back pressure regulating valve is connected in series with two first shut-off valves, which are located on both sides of the back pressure regulating valve.

[0011] In an optional embodiment, the back pressure regulating valve is connected in parallel with a first bypass valve, which is a shut-off valve.

[0012] In an optional embodiment, the water tank is equipped with a vacuum deoxygenation module, which includes a dissolved oxygen content sensor, a vacuum regulating valve, a solenoid valve V4, and a vacuum pump. The dissolved oxygen content sensor is located on the water tank, and the vacuum regulating valve and the solenoid valve V4 are sequentially arranged on the connecting pipeline between the water tank and the vacuum pump. The vacuum regulating valve is connected to the air inlet pipe, and the rear end of the vacuum pump is connected to a PRE funnel.

[0013] In an optional embodiment, the air intake pipe is equipped with an air intake filter, the vacuum regulating valve is connected to the atmosphere through the air intake filter, and the water tank is equipped with a vacuum pressure sensor.

[0014] In an optional embodiment, two second shut-off valves are provided on the connecting pipeline between the water tank and the solenoid valve V4, and the two second shut-off valves are respectively located at the front and rear ends of the vacuum regulating valve.

[0015] In an optional embodiment, the vacuum regulating valve is further connected in parallel with a second bypass valve, the two ends of which are respectively connected to the front end of a second shut-off valve and the rear end of another second shut-off valve.

[0016] The advantages and beneficial effects of this utility model compared to the prior art are:

[0017] In this invention, a water tank level sensor and a solenoid valve V1 are installed in the water tank filling module, and a booster pump, a solenoid valve V2, a water pressure sensor, and a back pressure regulating valve V6 are installed in the drainage module. The water tank level sensor serves as feedback for starting and stopping the water filling, and the water pressure sensor serves as feedback for adjusting the pump pressure in the drainage circuit. This eliminates reliance on manual experience, simplifies operation, improves efficiency, reduces the amount of manual operation, and enhances the degree of automation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. 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 based on these drawings without creative effort. In the drawings:

[0019] Figure 1This is a schematic diagram of the SEBIM safety valve water filling and venting system of this utility model.

[0020] In the diagram: 1-Water tank, 2-Inlet, 3-Solenoid valve V1, 4-Water tank level sensor, 5-Boost pump, 6-Solenoid valve V2, 7-Water pressure sensor, 8-Back pressure regulating valve V6, 9-Main valve, 10-Control cabinet, 11-Solenoid valve V3, 12-Ball valve, 13-PRE funnel, 14-Filter F1, 15-Filter F2, 1601-Differential pressure transmitter A, 1602-Differential pressure transmitter B, 17-Flow meter, 18-First shut-off valve, 19-First bypass valve, 20-Water dissolved oxygen content sensor, 21-Vacuum regulating valve V5, 22-Solenoid valve V4, 23-Vacuum pump, 24-Inlet pipe, 25-Inlet filter, 26-Vacuum pressure sensor, 27-Second shut-off valve, 28-Second bypass valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0022] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0023] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0025] like Figure 1 As shown, a nuclear power SEBIM safety valve water filling and venting system includes a water tank 1, a water tank filling module, and a drainage module.

[0026] The water tank filling module includes a REA system water-side inlet 2, a solenoid valve V1 3, and a water tank level sensor 4. The solenoid valve V1 3 is a two-position, two-way solenoid valve located on the connecting pipe between the inlet 2 and the water tank 1. The water tank level sensor 4 is located on the water tank 1 and is used to sense the water level in the tank. Water is filled into the water tank 1 through the inlet 2, and the water level sensor 4 detects the water level, providing feedback for starting and stopping the filling process.

[0027] The drainage module includes a booster pump 5, a solenoid valve V2 6, and a water pressure sensor 7. Both the booster pump 5 and the solenoid valve V2 6 are located on the outlet pipe of the water tank 1, and are arranged sequentially. The solenoid valve V2 6 is a two-position, two-way solenoid valve. The water pressure sensor 7 is located between the booster pump 5 and the solenoid valve V2 6. The booster pump 5 is connected in parallel to a back pressure regulating valve V6 8. One end of the back pressure regulating valve V6 8 is connected to the outlet pipe of the water tank 1, and the other end is connected to the rear pipe of the booster pump 5. The rear end of the solenoid valve V2 6 is sequentially connected to the control cabinet 10 and the main valve 9. The rear end of the main valve 9 is connected to a solenoid valve V3 11 and a ball valve 12. The solenoid valve V3 11 is a two-position, three-way valve. The rear end of the ball valve 12 is connected to the water tank 1. The solenoid valve V3 11 is also connected to a PRE funnel 13 to connect to the drainage and venting system. The water pressure sensor 7 is used to detect the pressure value of the drainage circuit. If the booster pump 5 is over-pressurized, the back pressure regulating valve V6 8 is opened to overflow and release pressure. If the booster pump 5 is not over-pressurized, the water in the water tank 1 enters the main valve 9 through the drainage circuit.

[0028] In this embodiment, a water tank level sensor 4 and a solenoid valve V1 3 are installed in the water tank filling module, and a booster pump 5, a solenoid valve V2 6, a water pressure sensor 7, and a back pressure regulating valve V6 8 are installed in the drainage module. The water tank level sensor 4 serves as feedback for water filling start and stop, and the water pressure sensor 7 serves as feedback for adjusting the pump pressure of the drainage circuit. This eliminates reliance on manual experience, simplifies operation, improves efficiency, reduces the amount of manual operation, and enhances the degree of automation.

[0029] Furthermore, a filter F1 14 is provided between the solenoid valve V1 3 and the water tank 1, and a filter F2 15 is provided between the solenoid valve V2 6 and the control cabinet 10. Both filters F1 14 and F2 15 are equipped with differential pressure sensors, which are differential pressure transmitters. Figure 1 Differential pressure transmitters A 1601 and B 1602 are included. The differential pressure sensor is used to display the pressure difference across the filter, providing feedback on whether the filter needs to be replaced.

[0030] A flow meter 17 is provided between the filter F2 15 and the solenoid valve V2 6 to test the amount of water flowing to the control cabinet 10 and the main valve 9.

[0031] In this embodiment, the back pressure regulating valve is connected in series with two first shut-off valves 18, which are located on both sides of the back pressure regulating valve. The first shut-off valves 18 at the front and rear ends facilitate the disconnection of the circuit when maintaining the back pressure regulating valve. The back pressure regulating valve is connected in parallel with a first bypass valve 19, which is a shut-off valve. The first bypass valve 19 is normally closed and is opened when maintaining the back pressure regulating valve without affecting the normal operation of the equipment.

[0032] Furthermore, a vacuum deoxygenation module is provided on the water tank 1. The vacuum deoxygenation module includes a dissolved oxygen content sensor 20, a vacuum degree regulating valve V5 21, a solenoid valve V4 22, and a vacuum pump 23.

[0033] The dissolved oxygen sensor 20 is installed on the water tank 1 to monitor the oxygen content in the water. The vacuum regulating valve V5 21 and the solenoid valve V4 22 are sequentially installed on the connecting pipeline between the water tank 1 and the vacuum pump 23. The vacuum regulating valve 21 is connected to the air inlet pipe 24, and the rear end of the vacuum pump 23 is connected to the PRE funnel 13. The vacuum level of the air entering the water tank 1 is regulated by communicating with air through the vacuum regulating valve V5 21.

[0034] Furthermore, an air intake filter 25 is provided on the air intake pipe 24, and the vacuum regulating valve 21 is connected to the atmosphere through the air intake filter 25. A vacuum pressure sensor 26 is provided on the water tank 1 to monitor the vacuum level inside the water tank 1.

[0035] In this invention, a water dissolved oxygen content sensor 20, a vacuum degree regulating valve V5 21, and a vacuum pressure sensor 26 are set up for real-time monitoring. This eliminates the need for manual labor, frees the reliance on human experience, simplifies operation, increases efficiency, and improves the degree of automation.

[0036] Two second shut-off valves 27 are installed on the connecting pipeline between the water tank 1 and the solenoid valve V4 22. The two second shut-off valves 27 are located at the front and rear ends of the vacuum regulating valve 21, respectively. The two ends of the second shut-off valves 27 are connected in series to cut off the circuit during maintenance. The vacuum regulating valve 21 is also connected in parallel with a second bypass valve 28. The two ends of the second bypass valve 28 are connected to the front end of one second shut-off valve 27 and the rear end of the other second shut-off valve 27, respectively. The second bypass valve 28 is normally closed. This passage is opened during maintenance without affecting the normal use of the equipment.

[0037] The working principle of the water filling and air venting system in this embodiment is as follows:

[0038] 1. Perform preparatory work before filling with water and venting air;

[0039] 2. After completing the preparations, proceed with filling water tank 1 with water:

[0040] (1) Open solenoid valves V1 3 and V3. Water enters water tank 1 through solenoid valve V1 and filter F1 14. Gas in water tank 1 is connected to the RPE funnel circuit through the pipeline where solenoid valve V3 11 and ball valve 12 are located. The RPE funnel is then connected to the drainage and exhaust system.

[0041] (2) Determine whether it is necessary to continue filling with water by the liquid level value displayed by the water tank level sensor 4. After filling with water, close the solenoid valves V1 3 and V3.

[0042] (3) The gas in water tank 1 is discharged to the condensate exhaust system through the RPE funnel.

[0043] (4) The water tank level sensor 4 monitors the water level of water tank 1 in real time. When the water level reaches the set high value, the solenoid valve V13 closes and stops water injection into water tank 1. When the water level reaches the set low value, the booster pump 5 is turned off and water injection into the main valve 9 is stopped.

[0044] 3. After filling water tank 1, perform vacuum deoxygenation:

[0045] 1) Monitor the dissolved oxygen content in water tank 1. When the dissolved oxygen content is greater than the set value (4mg / L), open the solenoid valve V4 22 and the vacuum regulating valve V5 21.

[0046] 2) Start the vacuum pump 23 to discharge the gas in the water tank 1 through the vacuum pump 23 and discharge it into the hydrophobic exhaust system through the RPE funnel.

[0047] 3) If the dissolved oxygen content in the water is found to be less than the set value of 2 mg / L, close the solenoid valve V4 22 and the vacuum pump 23.

[0048] 4) If the vacuum pressure sensor 26 shows that the vacuum level is too high, the intake vacuum level can be adjusted by connecting the vacuum level regulating valve V5 21 to the air.

[0049] 4. After completing the vacuum deoxygenation process, perform the SEBIM safety valve water filling and venting operation:

[0050] 1) Open solenoid valve V2 6 to connect the SEBIM safety valve water filling circuit and start booster pump 5.

[0051] 2) The water pressure sensor 7 detects the circuit pressure value. If the booster pump 5 is over-pressurized, the back pressure regulating valve V6 is opened to release pressure. If the booster pump 5 is not over-pressurized, the water in the water tank 1 passes through the booster pump 5, the circuit isolation valve, the solenoid valve V2 6, the flow sensor, the filter F2 15, and the control cabinet 10 before entering the main valve 9.

[0052] 3) Switch solenoid valve V3 11, and water enters water tank 1 from main valve 9.

[0053] 4) Monitor the dissolved oxygen content in water tank 1. When the dissolved oxygen content is greater than the set value (4mg / L), open the solenoid valve V4 22 and the vacuum regulating valve V5 21, start the vacuum pump 23, and discharge the gas in water tank 1 through the vacuum pump 23 and discharge it to the hydrophobic exhaust system through the RPE funnel.

[0054] 5) If the vacuum pressure sensor 26 shows that the vacuum level is too high, the intake vacuum level can be adjusted by connecting the vacuum level regulating valve V5 21 to the air.

[0055] 6) If the dissolved oxygen content in the water is found to be less than the set value of 2 mg / L, close solenoid valves V3 11 and V4 and vacuum pump 23, and vent the main valve 9.

[0056] 7) Circulate the air to exhaust until the main valve 9 completes the water filling and air exhaust process.

[0057] In this invention, an electric pump, a flow meter 17, a solenoid valve, a pressure sensor, a flow sensor, and a dissolved oxygen content detector are installed in the water filling and venting system to improve water filling and venting efficiency and reduce the amount of manual operation. This achieves automation of water filling, venting, pressurization, and drainage.

[0058] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water filling and venting system for a nuclear power plant SEBIM safety valve, characterized in that, The system includes a water tank, a water tank filling module, and a drainage module. The water tank filling module includes a water inlet, a solenoid valve V1, and a water tank level sensor. The solenoid valve V1 is located between the water inlet and the water tank, and the water tank level sensor is located on the water tank. The drainage module includes a booster pump, a solenoid valve V2, and a water pressure sensor. The booster pump and solenoid valve V2 are arranged sequentially, and the water pressure sensor is located between the booster pump and the solenoid valve V2. The booster pump is connected in parallel with a back pressure regulating valve. The rear end of the solenoid valve V2 is connected in sequence to a control cabinet and a main valve. The rear end of the main valve is connected to a solenoid valve V3 and a ball valve. The rear end of the ball valve is connected to the water tank. The solenoid valve V3 is also connected to a PRE funnel to connect to a drainage and venting system.

2. The nuclear power plant SEBIM safety valve water filling and venting system according to claim 1, characterized in that, A filter F1 is provided between the solenoid valve V1 and the water tank, and a filter F2 is provided between the solenoid valve V2 and the control cabinet.

3. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 2, characterized in that, Both filter F1 and filter F2 are equipped with differential pressure sensors.

4. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 3, characterized in that, A flow meter is installed between the filter F2 and the solenoid valve V2.

5. A nuclear power plant SEBIM safety valve water filling and venting system according to any one of claims 1 to 4, characterized in that... The back pressure regulating valve is connected in series with two first shut-off valves, which are located on both sides of the back pressure regulating valve.

6. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 5, characterized in that, The back pressure regulating valve is connected in parallel with a first bypass valve, which is a shut-off valve.

7. A nuclear power plant SEBIM safety valve water filling and venting system according to any one of claims 1 to 4, characterized in that, The water tank is equipped with a vacuum deoxygenation module, which includes a dissolved oxygen content sensor, a vacuum regulating valve, a solenoid valve V4, and a vacuum pump. The dissolved oxygen content sensor is located on the water tank. The vacuum regulating valve and the solenoid valve V4 are sequentially installed on the connecting pipeline between the water tank and the vacuum pump. The vacuum regulating valve is connected to the air inlet pipe, and the rear end of the vacuum pump is connected to a PRE funnel.

8. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 7, characterized in that, An air intake filter is installed on the air intake pipe, the vacuum regulating valve is connected to the atmosphere through the air intake filter, and a vacuum pressure sensor is installed on the water tank.

9. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 8, characterized in that, Two second shut-off valves are installed on the connecting pipeline between the water tank and the solenoid valve V4. The two second shut-off valves are located at the front and rear ends of the vacuum regulating valve, respectively.

10. A nuclear power plant SEBIM safety valve water filling and venting system according to claim 9, characterized in that, The vacuum regulating valve is also connected in parallel with a second bypass valve, the two ends of which are respectively connected to the front end of a second shut-off valve and the rear end of another second shut-off valve.

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