Nuclear power unit conventional island liquid tank type discharge system

Abstract

The utility model provides a nuclear power unit conventional island liquid tank type discharge system. The system comprises a liquid storage pool unit and a treatment tank unit which are connected with a conventional island liquid discharge end through a pipeline; the liquid storage tank unit is connected with the treatment tank unit through a pipeline; and the treatment tank unit is used for storing the liquid conveyed from the liquid storage pool unit so that a user can discharge the liquid, and when the liquid reaches a preset discharge standard, the liquid meeting the preset discharge standard is discharged. Environment-friendly and up-to-standard discharge of nuclear power unit conventional island liquid is achieved, environment pollution is effectively prevented, safety and compliance of discharged liquid are ensured, and meanwhile the environment friendliness and reliability of nuclear power unit operation are improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a liquid tank discharge system for conventional islands of nuclear power units. Background Technology

[0002] Current conventional island drainage methods primarily rely on pre-sampling and testing to ensure the liquid passes inspection before directly discharging it into the external environment. While this method is simple to operate, it has a significant drawback: there is no continuous monitoring of the drainage process. This means that the quality and safety of the drainage cannot be guaranteed, and it cannot be ensured that all discharged water meets environmental standards. Utility Model Content

[0003] To address the shortcomings of existing conventional island drainage methods that lack continuous monitoring of drainage and cannot ensure drainage quality and safety, a conventional island liquid tank discharge system for nuclear power units is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a liquid tank discharge system for the conventional island of a nuclear power unit, including a storage tank unit (2) connected to the liquid discharge end of the conventional island system (1) through a pipeline, and also including a treatment tank unit (3);

[0005] The liquid storage tank unit (2) is connected to the processing tank unit (3) via a pipeline;

[0006] The processing tank unit (3) is used to store the liquid transmitted from the storage tank unit (2) for users to discharge, so that when the liquid reaches the preset discharge standard, the liquid that meets the preset discharge standard will be discharged.

[0007] In one embodiment, the system further includes an intermediate pool unit (5), which is connected to the liquid storage pool unit (2) and the processing tank unit (3) via pipelines, and is used to temporarily store the liquid transmitted by the liquid storage pool unit (2).

[0008] In one embodiment, the system further includes a main pipe (24) and a secondary pipe (28); the liquid storage tank unit (2) includes a liquid storage tank (21), a water pump (22) and a first drain valve (23);

[0009] The storage tank (21) is connected to the processing tank unit (3) through the main pipeline (24); the storage tank (21) is connected to the intermediate tank unit (5) through the secondary pipeline (28), and is also connected to the main pipeline (24) through a pipeline.

[0010] The main pipeline (24) is provided with the water pump (22) and the first drain valve (23) in sequence on one side of the liquid storage tank (21). The first drain valve (23) is used to control the discharge of the liquid pumped by the water pump (22).

[0011] In one embodiment, the intermediate pool unit (5) includes a first intermediate pool (51), a second intermediate pool (52), a second drain valve (53), a first branch pipe (54), a second branch pipe (55), and a third drain valve (59);

[0012] The first intermediate pool (51) and the second intermediate pool (52) are connected by the first branch pipe (54), and the liquid storage pool (21) is connected to the first intermediate pool (51) through the secondary pipe (28);

[0013] The secondary pipe (28) is equipped with the third drain valve (53) near the first intermediate pool (51) to control the flow of liquid into the first intermediate pool (51). The second intermediate pool (52) and the main pipe (24) are connected through the second branch pipe (55), and the third drain valve (59) is provided on the second branch pipe (55).

[0014] In one embodiment, the processing tank unit (3) includes a first processing tank (31), a second processing tank (32), a third processing tank (33), a first water inlet pipe (34), a first water outlet pipe (35), a second water inlet pipe (36), a second water outlet pipe (37), a third water inlet pipe (38), and a third water outlet pipe (39);

[0015] The first treatment tank (31) is connected to the main pipeline (24) through the first water inlet pipe (34) and is connected to the external environment (7) through the first water outlet pipe (35); the first water inlet pipe (34) is provided with a first water inlet valve (40) and the first water outlet pipe (35) is provided with a fourth drain valve (41);

[0016] The second treatment tank (32) is connected to the main pipeline (24) through the second water inlet pipe (36) and is connected to the external environment (7) through the second water outlet pipe (37); the second water inlet pipe (36) is provided with a second water inlet valve (42) and the second water outlet pipe (37) is provided with a fifth drain valve (43);

[0017] The third treatment tank (33) is connected to the main pipeline (24) through the third water inlet pipe (38) and is connected to the external environment (7) through the third water outlet pipe (39); the third water inlet pipe (38) is equipped with a third water inlet valve (44) and the third water outlet pipe (39) is equipped with a sixth drain valve (45).

[0018] In one embodiment, the system further includes a cooling water pipe (29); the liquid storage tank (21) is equipped with a first temperature measuring instrument (25), and the first intermediate tank (51) is equipped with a second temperature measuring instrument (56);

[0019] The cooling water pipe (29) is connected to an external cooling water device (6) and is equipped with a first cooling water valve (26) for controlling the flow of cooling water to the storage tank (21) and a second cooling water valve (57) for controlling the flow of cooling water to the first intermediate tank (51).

[0020] The first cooling water valve (26) is in the open state when the temperature data of the first temperature measuring instrument (25) is greater than the preset temperature threshold.

[0021] The second cooling water valve (57) is in the open state when the temperature data of the second temperature measuring instrument (56) is greater than the preset temperature.

[0022] In one embodiment, a first liquid level measuring instrument (27) is provided in the liquid storage tank;

[0023] When the liquid level height of the first liquid level measuring instrument (27) is greater than the first preset liquid level height, the water pump is in the start state and the first drain valve (23) is in the open state.

[0024] The second intermediate pool (52) is equipped with a second liquid level measuring instrument (58), and the third drain valve (59) is in the open state when the liquid level height of the second liquid level measuring instrument (58) is greater than the second preset liquid level height.

[0025] The present invention offers the following advantages: This application provides a liquid tank discharge system for the conventional island of a nuclear power unit. The system includes a storage tank unit and a treatment tank unit connected to the liquid discharge end of the conventional island via pipelines. The storage tank unit is connected to the treatment tank unit via pipelines. The treatment tank unit is used to store, circulate, sample, and analyze the liquid transferred from the storage tank unit for user discharge treatment. When the liquid meets preset discharge standards, it is discharged, and the radioactivity of the discharged liquid is continuously monitored during the discharge process. This achieves environmentally friendly and compliant discharge of liquids from the conventional island of the nuclear power unit, effectively preventing environmental pollution, ensuring the safety and compliance of the discharged liquids, and improving the environmental friendliness and reliability of the nuclear power unit operation. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0027] Figure 1This is a schematic diagram of an embodiment of the conventional island liquid tank discharge system for nuclear power units according to this utility model;

[0028] Figure 2 This is a schematic diagram of another embodiment of the conventional island liquid tank discharge system for nuclear power units according to this utility model.

[0029] Component Numbers: 1. Conventional Island; 2. Liquid Storage Tank Unit; 21. Liquid Storage Tank; 22. Water Pump; 23. First Drain Valve; 24. Main Pipeline; 25. First Temperature Measuring Instrument; 26. First Cooling Water Valve; 27. First Liquid Level Measuring Instrument; 28. Secondary Pipeline; 3. Processing Tank Unit; 31. First Processing Tank; 32. Second Processing Tank; 33. Third Processing Tank; 34. First Inlet Pipeline; 35. First Outlet Pipeline; 36. Second Inlet Pipeline; 37. Second Outlet Pipeline; 38. Third Inlet Pipeline 39. Third outlet pipe; 40. First inlet valve; 41. Fourth drain valve; 42. Second inlet valve; 43. Fifth drain valve; 44. Third inlet valve; 45. Sixth drain valve; 5. Intermediate pool unit; 51. First intermediate pool; 52. Second intermediate pool; 53. Second drain valve; 54. First branch pipe; 55. Second branch pipe; 56. Second temperature measuring instrument; 57. Second cooling water valve; 58. Second liquid level measuring instrument; 59. Third drain valve; 6. External cooling water device; 7. External environment. Detailed Implementation

[0030] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0031] like Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of the conventional island liquid tank discharge system for nuclear power units according to this utility model.

[0032] The technical solution adopted by this utility model to solve its technical problem is: to construct a liquid tank discharge system for conventional island of nuclear power unit, including a liquid storage tank unit 2 connected to the liquid discharge end of conventional island system 1 through a pipeline, and also including a treatment tank unit 3.

[0033] The liquid storage tank unit 2 is connected to the processing tank unit 3 via a pipeline;

[0034] The processing tank unit 3 is used to store, circulate, sample, and test the liquid transmitted from the storage tank unit 2 for users to discharge. When the liquid reaches the preset discharge standard, the liquid that meets the preset discharge standard will be discharged.

[0035] Water from the conventional island system 1 of the nuclear power plant is discharged to storage tank unit 2. Storage tank unit 2 is used to temporarily collect and store the liquid discharged from conventional island system 1. The water in storage tank unit 2 is then discharged to treatment tank unit 3. Treatment tank unit 3 includes three treatment tanks for further treatment of the liquid. In the treatment tanks, the water is circulated, sampled, and parameters such as pH and total gamma activity are monitored. These parameters must meet the relevant requirements of the regulations governing the discharge of radioactive effluents. When the water in the treatment tanks meets the preset discharge standards, and radioactivity is monitored in real time without exceeding the preset discharge flow rate, the water in the treatment tanks can be safely discharged into the external environment. By setting up treatment tank unit 3, compliant discharge from the conventional island system 1 of the nuclear power plant is achieved. Storage tank unit 2 can temporarily collect the liquid. Treatment tank unit 3, through steps such as circulation, sampling, and discharge monitoring, ensures that the liquid meets strict environmental standards before discharge, especially the continuous real-time monitoring of radioactive materials, effectively preventing environmental pollution accidents. Furthermore, the control of the preset discharge flow rate further ensures the safety and compliance of the discharge process. This system not only improves the environmental reliability of nuclear power units, but also provides a referable solution for the treatment of liquid emissions from similar units, resulting in significant environmental and social benefits.

[0036] like Figure 2 As shown, the system also includes an intermediate pool unit 5, which is connected to the liquid storage pool unit 2 and the processing tank unit 3 via pipelines, and is used to temporarily store the large amount of liquid transferred from the liquid storage pool unit 2.

[0037] Furthermore, the system also includes a main pipe 24 and a secondary pipe 28; the liquid storage tank unit 2 includes a liquid storage tank 21, a water pump 22 and a first drain valve 23;

[0038] The storage tank 21 is connected to the processing tank unit 3 via the main pipeline 24; the storage tank 21 is connected to the intermediate tank unit 5 via the auxiliary pipeline 28; and is connected to the main pipeline (24) via a pipeline.

[0039] The main pipeline 24 is equipped with a water pump 22 and a first drain valve 23 on one side of the liquid storage tank 21. The first drain valve 23 is used to control the discharge of the liquid pumped by the water pump 22.

[0040] Furthermore, the intermediate pool unit 5 includes a first intermediate pool 51, a second intermediate pool 52, a second drain valve 53, a first branch pipe 54, a second branch pipe 55, and a third drain valve 59.

[0041] The first intermediate pool 51 and the second intermediate pool 52 are connected by the first branch pipe 54, and the storage pool 21 is connected to the first intermediate pool 51 by the auxiliary pipe 28.

[0042] The secondary pipe 28 is equipped with a third drain valve 59 near the first intermediate pool 51 to control the flow of liquid into the first intermediate pool 51. The second intermediate pool 52 and the main pipe 24 are connected through a second branch pipe 55, which is equipped with a third drain valve 59.

[0043] Furthermore, the processing tank unit 3 includes a first processing tank 31, a second processing tank 32, a third processing tank 33, a first water inlet pipe 34, a first water outlet pipe 35, a second water inlet pipe 36, a second water outlet pipe 37, a third water inlet pipe 38, and a third water outlet pipe 39.

[0044] The first treatment tank 31 is connected to the main pipeline 24 through the first inlet pipe 34 and is connected to the external environment 7 through the first outlet pipe 35; the first inlet pipe 34 is equipped with a first inlet valve 40 and the first outlet pipe 35 is equipped with a fourth drain valve 41.

[0045] The second treatment tank 32 is connected to the main pipeline 24 through the second inlet pipe 36 and is connected to the external environment 7 through the second outlet pipe 37; the second inlet pipe 36 is equipped with a second inlet valve 42 and the second outlet pipe 37 is equipped with a fifth drain valve 43.

[0046] The third treatment tank 33 is connected to the main pipeline 24 through the third inlet pipe 38 and is connected to the external environment 7 through the third outlet pipe 39; the third inlet pipe 38 is equipped with a third inlet valve 44 and the third outlet pipe 39 is equipped with a sixth drain valve 45.

[0047] In one embodiment, the workflow begins with a drainage preparation phase. This involves pre-emptively cleaning equipment defects in the storage tank 21, treatment tank unit 3, and intermediate tank unit 5 to ensure system usability; installing temporary pumps and related equipment, such as fireproof cloth and temporary fans, to prepare for drainage; and coordinating with relevant departments to ensure no water leakage occurs during drainage. Since the conventional island system 1 requires a large volume of water to be discharged, sampling and approval processes are arranged in advance to shorten the overall drainage time. Next, the drainage execution phase begins. Drainage from the conventional island system first enters the storage tank 21, and a portion of the liquid is transferred to the intermediate tank unit 5 via the secondary pipe 28. When the intermediate tank unit 5 reaches a high liquid level, the transfer of water from the storage tank 21 to the intermediate tank unit 5 is stopped, and the liquid is then transported to the treatment tank unit 3 via the pump 22 and the main pipe 24. In the treatment tank unit 3, the liquid is circulated and sampled for analysis to ensure that its parameters, such as pH value and total gamma activity, comply with the regulations for the discharge of radioactive effluents. Once the liquid parameters meet the standards, the liquid is discharged at a rate not exceeding 150m³. 3 The system discharges water at a rate of / h to the external environment while simultaneously monitoring radioactivity in real time. During drainage, the operator monitors the liquid levels at key points, such as the storage tank 21, treatment tank unit 3, and intermediate tank unit 5, ensuring that the liquid levels do not exceed safety limits. The operator adjusts the operation of the pump 22 and the opening of the first drain valve 23 according to the actual situation to control the drainage rate. When the liquid level in the last treatment tank of treatment tank unit 3 reaches 4m and the preceding discharge tank is not empty, the drainage of the conventional island system 1 is interrupted, and drainage continues only when the tanks are ready to receive water. Finally, in the drainage completion phase, after drainage is completed, the air supply to the drain valve of the storage tank 21 pit is restored to process the remaining liquid. Temporary equipment, such as temporary pumps, fireproof cloth, and temporary fans, is removed, and the system is restored to normal operation.

[0048] Furthermore, the system also includes a cooling water pipe 29; a first temperature measuring instrument 25 is installed in the liquid storage tank 21, and a second temperature measuring instrument 56 is installed in the first intermediate tank 51;

[0049] The cooling water pipe 29 is connected to the external cooling water device 6 and is equipped with a first cooling water valve 26 that controls the flow of cooling water to the storage tank 21 and a second cooling water valve 57 that controls the flow of cooling water to the first intermediate tank 51.

[0050] The first cooling water valve 26 is in the open state when the temperature data of the first temperature measuring instrument 25 is greater than the preset temperature threshold.

[0051] The second cooling water valve 57 is in the open state when the temperature data of the second temperature measuring instrument 56 is greater than the preset temperature.

[0052] In one embodiment, to reduce the total water volume requiring treatment by the first treatment tank 31, the second treatment tank 32, and the third treatment tank 32, the amount of cooling water introduced when the conventional island drainage reaches the storage tank in the turbine building is controlled. Furthermore, while ensuring controllable water temperature, the cooling water flow rate is precisely controlled to minimize the volume of cooling water introduced, thereby reducing the overall system drainage volume. After repeated studies, it was determined that the storage tank temperature should be controlled at 43°C, and the sump temperature should be maintained by adjusting the opening of the cooling water flow isolation valve in real time on-site.

[0053] Furthermore, a first liquid level measuring instrument 27 is installed in the storage tank;

[0054] When the liquid level height of the first liquid level measuring instrument 27 is greater than the first preset liquid level height, the water pump is in the start state and the first drain valve 23 is in the open state.

[0055] The second intermediate pool 52 is equipped with a second liquid level measuring instrument 58, and the third drain valve 59 is in the open state when the liquid level height of the second liquid level measuring instrument 58 is greater than the second preset liquid level height.

[0056] 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 liquid tank discharge system for the conventional island of a nuclear power unit, comprising a storage tank unit (2) connected via a pipeline to the liquid discharge end of the conventional island system (1), characterized in that, It also includes a processing tank unit (3); The liquid storage tank unit (2) is connected to the processing tank unit (3) via a pipeline; The processing tank unit (3) is used to store the liquid transmitted from the storage tank unit (2) for users to discharge, so that when the liquid reaches the preset discharge standard, the liquid that meets the preset discharge standard will be discharged.

2. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 1, characterized in that, The system also includes an intermediate pool unit (5), which is connected to the liquid storage pool unit (2) and the processing tank unit (3) via pipelines, and is used to temporarily store the liquid transmitted by the liquid storage pool unit (2).

3. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 2, characterized in that, The system also includes a main pipeline (24) and a secondary pipeline (28); the liquid storage tank unit (2) includes a liquid storage tank (21), a water pump (22) and a first drain valve (23); The storage tank (21) is connected to the processing tank unit (3) through the main pipeline (24); the storage tank (21) is connected to the intermediate tank unit (5) through the secondary pipeline (28), and is also connected to the main pipeline (24) through a pipeline. The main pipeline (24) is provided with the water pump (22) and the first drain valve (23) in sequence on one side of the liquid storage tank (21). The first drain valve (23) is used to control the discharge of the liquid pumped by the water pump (22).

4. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 3, characterized in that, The intermediate pool unit (5) includes a first intermediate pool (51), a second intermediate pool (52), a second drain valve (53), a first branch pipe (54), a second branch pipe (55), and a third drain valve (59); The first intermediate pool (51) and the second intermediate pool (52) are connected by the first branch pipe (54), and the liquid storage pool (21) is connected to the first intermediate pool (51) through the secondary pipe (28); The secondary pipe (28) is equipped with the third drain valve (59) near the first intermediate pool (51) to control the flow of liquid into the first intermediate pool (51). The second intermediate pool (52) and the main pipe (24) are connected through the second branch pipe (55), and the third drain valve (59) is provided on the second branch pipe (55).

5. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 4, characterized in that, The processing tank unit (3) includes a first processing tank (31), a second processing tank (32), a third processing tank (33), a first water inlet pipe (34), a first water outlet pipe (35), a second water inlet pipe (36), a second water outlet pipe (37), a third water inlet pipe (38), and a third water outlet pipe (39); The first treatment tank (31) is connected to the main pipeline (24) through the first water inlet pipe (34) and is connected to the external environment (7) through the first water outlet pipe (35); the first water inlet pipe (34) is provided with a first water inlet valve (40) and the first water outlet pipe (35) is provided with a fourth drain valve (41); The second treatment tank (32) is connected to the main pipeline (24) through the second water inlet pipe (36) and is connected to the external environment (7) through the second water outlet pipe (37); the second water inlet pipe (36) is provided with a second water inlet valve (42) and the second water outlet pipe (37) is provided with a fifth drain valve (43); The third treatment tank (33) is connected to the main pipeline (24) through the third water inlet pipe (38) and is connected to the external environment (7) through the third water outlet pipe (39); the third water inlet pipe (38) is equipped with a third water inlet valve (44) and the third water outlet pipe (39) is equipped with a sixth drain valve (45).

6. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 5, characterized in that, The system also includes a cooling water pipe (29); the liquid storage tank (21) is equipped with a first temperature measuring instrument (25), and the first intermediate tank (51) is equipped with a second temperature measuring instrument (56); The cooling water pipe (29) is connected to an external cooling water device (6) and is equipped with a first cooling water valve (26) for controlling the flow of cooling water to the storage tank (21) and a second cooling water valve (57) for controlling the flow of cooling water to the first intermediate tank (51). The first cooling water valve (26) is in the open state when the temperature data of the first temperature measuring instrument (25) is greater than the preset temperature threshold. The second cooling water valve (57) is in the open state when the temperature data of the second temperature measuring instrument (56) is greater than the preset temperature.

7. The liquid tank discharge system for the conventional island of a nuclear power unit according to claim 6, characterized in that, The storage tank is equipped with a first liquid level measuring instrument (27); When the liquid level height of the first liquid level measuring instrument (27) is greater than the first preset liquid level height, the water pump is in the on state and the first drain valve (23) is in the open state. The second intermediate pool (52) is equipped with a second liquid level measuring instrument (58), and the third drain valve (59) is in the open state when the liquid level height of the second liquid level measuring instrument (58) is greater than the second preset liquid level height.

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