Auxiliary steam drainage system of nuclear power plant

Abstract

The utility model relates to the technical field of nuclear engineering design, and particularly discloses an auxiliary steam drainage system of a nuclear power plant, which comprises an auxiliary steam pipeline, a drainage valve group and a drainage collecting well, the auxiliary steam pipeline is provided with a plurality of drain points, the drain valve group comprises a plurality of drain valves, the drain valves are in one-to-one correspondence with the drain points, the drain valves are arranged at the drain points, the drain valves are used for filtering substances except steam, and the drain collecting well is connected with the drain valves. By means of the arrangement, the auxiliary steam pipeline is arranged in an overground overhead mode, the drain valve sets are synchronously arranged on the ground and are different from an underground arrangement mode of an existing nuclear power plant area auxiliary steam drain system, meanwhile, a plurality of different drain points are introduced into the same drain collecting well, the arrangement number of the drain collecting wells is reduced, and the drainage efficiency is improved. The operation and maintenance difficulty of the auxiliary steam pipeline is reduced, and convenience is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear engineering design, in particular to an auxiliary steam drainage system for a nuclear power plant. Background Art

[0002] The auxiliary steam pipelines in the nuclear power plant area are generally arranged by trench laying. During operation, due to various natural reasons, especially during heavy rain, it is easy to cause long-term water accumulation in the valve wells along the trench where the pipelines are laid. There are prominent problems such as harsh environment (high temperature and high humidity), serious damage to the pipeline equipment insulation, serious corrosion, and leakage of the auxiliary steam pipe network, which bring great challenges to operation and maintenance. The leakage of the auxiliary steam pipe network will pose a threat to the personal safety of operating personnel. At the same time, since the auxiliary steam pipeline is laid by trench, the low points of the pipeline need to be drained, and there will be many drainage points. This requires arranging multiple inspection wells for discharging drainage water for multiple drainage points, and the convenience of operation and maintenance is poor. Content of the Utility Model

[0003] The purpose of the utility model is to provide an auxiliary steam drainage system for a nuclear power plant to solve the problems of large operation and maintenance difficulty and poor convenience of the existing auxiliary steam pipelines in the nuclear power plant area.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] The utility model provides an auxiliary steam drainage system for a nuclear power plant, including:

[0006] An auxiliary steam pipeline, which is arranged overhead and used to transmit the steam generated by the nuclear power plant. The auxiliary steam pipeline is provided with a plurality of drainage points;

[0007] A drainage valve group, which includes a plurality of drainage valves. The plurality of drainage valves correspond to the plurality of drainage points one by one, and the drainage valves are arranged at the drainage points. The drainage valves are used to filter out substances other than steam;

[0008] A drainage collection well, which is connected to the plurality of drainage valves.

[0009] As a preferred technical solution of the above auxiliary steam drainage system for a nuclear power plant, the auxiliary steam drainage system for a nuclear power plant further includes a pH monitor and a monitoring water tank. The pH monitor is used to monitor the pH value of the wastewater discharged from the drainage collection well. The monitoring water tank is connected between the drainage collection well and the siphon well, and the monitoring water tank is used to monitor the radioactivity of the wastewater.

[0010] As a preferred technical solution of the above auxiliary steam drainage system for a nuclear power plant, the auxiliary steam drainage system for a nuclear power plant further includes an acid-base neutralization tank, which is connected between the monitoring water tank and the drainage collection well.

[0011] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the auxiliary steam drainage system of the nuclear power plant further includes a first drainage pump, and the first drainage pump is arranged between the drainage collection well and the monitoring water tank.

[0012] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the auxiliary steam drainage system of the nuclear power plant further includes a second drainage pump, and the second drainage pump is arranged between the monitoring water tank and the siphon well.

[0013] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the auxiliary steam drainage system of the nuclear power plant further includes a cold water mixing device, and the cold water mixing device is connected to the drainage collection well and is used for supplying cold water to the drainage collection well.

[0014] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the cold water mixing device includes a cold water source tank, an outlet end of the cold water source tank is connected to the drainage collection well, and an inlet end of the cold water source tank is connected to the siphon well.

[0015] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the cold water mixing device further includes a cold water pump, and the cold water pump is arranged between the cold water source tank and the drainage collection well.

[0016] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, the cold water mixing device further includes a first switching valve and a second switching valve, the first switching valve is arranged at the inlet end of the cold water source tank, and the second switching valve is arranged at the outlet end of the cold water source tank.

[0017] As a preferred technical solution of the above-mentioned auxiliary steam drainage system of the nuclear power plant, a cold water addition port is arranged on the top end of the cold water source tank.

[0018] The beneficial effects of the present utility model are as follows:

[0019] The present utility model provides an auxiliary steam drainage system for a nuclear power plant. The auxiliary steam drainage system for the nuclear power plant includes: an auxiliary steam pipeline, a drainage valve group, and a drainage collection well. The auxiliary steam pipeline is arranged overhead and is used to transmit the steam generated by the nuclear power plant. The auxiliary steam pipeline is provided with a plurality of drainage points. The drainage valve group includes a plurality of drainage valves. The plurality of drainage valves correspond to the plurality of drainage points one by one, and the drainage valves are arranged at the drainage points. The drainage valves are used to filter out substances other than steam. The drainage collection well is connected to the plurality of drainage valves. With such an arrangement, the auxiliary steam pipeline is arranged overhead on the ground, and the drainage valve group is synchronously arranged on the ground, which is different from the underground arrangement mode of the existing auxiliary steam drainage system in the nuclear power plant plant area. At the same time, a plurality of different drainage points are further introduced into the same drainage collection well, reducing the number of arrangements of the drainage collection well, reducing the operation and maintenance difficulty of the auxiliary steam pipeline, and effectively improving the convenience of operation and maintenance. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the auxiliary steam drainage system for the nuclear power plant provided by the present utility model.

[0021] Wherein:

[0022] 1. Auxiliary steam pipeline; 2. Drainage valve; 3. Drainage collection well; 4. Monitoring water tank; 5. Acid-base neutralization tank; 6. First drainage pump; 7. Second drainage pump; 8. Mixing cooling water source tank; 9. Mixing cooling water pump; 10. Siphon well. Detailed Embodiment

[0023] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0025] Unless otherwise clearly defined and limited, the terms "installation", "connection", "attachment", and "fixation" shall be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0027] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0028] As Figure 1 shown, this embodiment provides an auxiliary steam drainage system for a nuclear power plant. The auxiliary steam drainage system for a nuclear power plant includes: an auxiliary steam pipeline 1, a steam trap group, and a drainage collection well 3. The auxiliary steam pipeline 1 is arranged overhead and is used to transmit the steam generated by the nuclear power plant. The auxiliary steam pipeline 1 is provided with a plurality of drainage points. The steam trap group includes a plurality of steam traps 2. The plurality of steam traps 2 correspond to the plurality of drainage points one by one, and the steam trap 2 is arranged at the drainage point. The steam trap 2 is used to filter out substances other than steam. The drainage collection well 3 is connected to the plurality of steam traps 2. With such an arrangement, the auxiliary steam pipeline 1 adopts an overhead arrangement on the ground, and the steam trap group is synchronously arranged on the ground, which is different from the underground arrangement mode of the existing auxiliary steam drainage system in the nuclear power plant plant area. At the same time, a plurality of different drainage points are further introduced into the same drainage collection well 3, reducing the number of arrangements of the drainage collection well 3, reducing the operation and maintenance workload and difficulty of the auxiliary steam pipeline 1, and effectively improving the convenience of operation and maintenance. It should be noted that the steam trap 2 is used to identify condensate and steam, and it is an automatic device that can discharge condensate, air, and other non-condensable gases while retaining steam.

[0029] Optionally, the auxiliary steam drainage system of the nuclear power plant further includes a pH monitor and a monitoring water tank 4. The pH monitor is used to monitor the pH value of the wastewater discharged from the drainage collection well 3. The monitoring water tank 4 is connected between the drainage collection well 3 and the siphon well 10, and the monitoring water tank 4 is used to monitor the radioactivity of the wastewater. With such an arrangement, the radioactivity of the wastewater discharged from the drainage collection well 3 can be monitored in a timely manner through the monitoring water tank 4. After meeting the standards, it is discharged into the siphon well 10.

[0030] Furthermore, the auxiliary steam drainage system of the nuclear power plant further includes an acid-base neutralization tank 5, and the acid-base neutralization tank 5 is connected between the monitoring water tank 4 and the drainage collection well 3.

[0031] Optionally, the auxiliary steam drainage system of the nuclear power plant further includes a first drainage pump 6, and the first drainage pump 6 is arranged between the drainage collection well 3 and the monitoring water tank 4. It should be noted that the first drainage pump 6 is also located between the acid-base neutralization tank 5 and the drainage collection well 3.

[0032] Optionally, the auxiliary steam drainage system of the nuclear power plant further includes a second drainage pump 7, and the second drainage pump 7 is arranged between the monitoring water tank 4 and the siphon well 10.

[0033] Optionally, the auxiliary steam drainage system of the nuclear power plant further includes a cold water mixing device, and the cold water mixing device is connected to the drainage collection well 3 and is used to supply cold water for mixing into the drainage collection well 3. With such an arrangement, multiple different drainage points are introduced into the drainage collection well 3, and centralized cold water mixing and cooling are carried out through the cold water mixing device, thereby reducing the layout of the cooling pond and reducing the workload and difficulty of operation and maintenance.

[0034] Optionally, the cold water mixing device includes a cold water mixing water tank 8. The outlet end of the cold water mixing water tank 8 is connected to the drainage collection well 3, and the inlet end of the cold water mixing water tank 8 is connected to the siphon well 10. With such an arrangement, non-radioactive wastewater is recycled for cold water mixing and cooling, saving the consumption of water resources, as well as saving the cold water mixing pond and corresponding pipelines, improving the utilization rate of water resources, and effectively reducing costs.

[0035] Optionally, the cold water mixing device further includes a cold water mixing pump 9, and the cold water mixing pump 9 is arranged between the cold water mixing water tank 8 and the drainage collection well 3.

[0036] Optionally, in order to better control the discharge or introduction of cold water for mixing from the cold water mixing water tank 8, the cold water mixing device further includes a first switching valve and a second switching valve. The first switching valve is arranged at the inlet end of the cold water mixing water tank 8, and the second switching valve is arranged at the outlet end of the cold water mixing water tank 8.

[0037] Optionally, in order to further supplement cold water for mixing into the cold water mixing water tank 8, a cold water for mixing inlet is provided at the top of the cold water mixing water tank 8.

[0038] The working process of the auxiliary steam drainage system of the nuclear power plant provided in this embodiment will be briefly described below.

[0039] Drainage points are arranged at the low points of the auxiliary steam pipeline 1, and a drainage valve group is set. Multiple different drainage points are introduced into the same drainage collection well 3 and are subjected to mixing and cooling. Specifically, the non-radioactive wastewater that has passed the monitoring and is discharged into the siphon well 10 is introduced into the mixing and cooling water source tank 8. When the wastewater in the drainage collection well 3 reaches a certain liquid level, the mixing and cooling water pump 9 will be started to carry out mixing and cooling. After the mixing and cooling is completed, when the drainage collection well 3 reaches the high liquid level, the first drainage pump 6 will be automatically interlocked. The pH value of the wastewater is monitored by a pH monitor. If the pH value meets the requirements, it will be directly discharged into the monitoring water tank 4, and after passing the monitoring, it will be directly discharged into the siphon well 10; if the pH value does not meet the requirements, the wastewater will be discharged into the acid-base neutralization tank 5 for treatment. After the treatment reaches the standard, it will be discharged into the monitoring water tank 4 again, and after passing the monitoring, it will be directly discharged into the siphon well 10.

[0040] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A nuclear power plant auxiliary steam drain system, characterized in that: include: An auxiliary steam pipeline (1), the auxiliary steam pipeline (1) being arranged overhead and used to transmit steam generated by a nuclear power plant, the auxiliary steam pipeline (1) being provided with a plurality of drain points; A steam trap group, the steam trap group comprising a plurality of steam traps (2), the plurality of steam traps (2) corresponding one to one with the plurality of steam trap points, the steam traps (2) being arranged at the steam trap points, the steam traps (2) being used to filter out substances other than steam; A drain collection well (3), wherein the drain collection well (3) is connected to a plurality of drain valves (2).

2. The auxiliary steam drain system of a nuclear power plant according to claim 1, characterized in that: The auxiliary steam drain system of the nuclear power plant further comprises a pH monitor and a monitoring water tank (4); the pH monitor is used to monitor the pH value of the wastewater discharged from the drain collection well (3); the monitoring water tank (4) is connected between the drain collection well (3) and the siphon well (10); and the monitoring water tank (4) is used to monitor the radioactivity of the wastewater.

3. The auxiliary steam drain system of a nuclear power plant according to claim 2, characterized in that: The nuclear power plant auxiliary steam drain system further comprises an acid-base neutralization tank (5), and the acid-base neutralization tank (5) is connected between the monitoring water tank (4) and the drain collection well (3).

4. The auxiliary steam drain system of a nuclear power plant according to claim 2, characterized in that: The nuclear power plant auxiliary steam drain system further comprises a first drain pump (6), wherein the first drain pump (6) is arranged between the drain collection well (3) and the monitoring water tank (4).

5. The auxiliary steam drain system of a nuclear power plant according to claim 2, characterized in that: The nuclear power plant auxiliary steam drain system further comprises a second drainage pump (7), wherein the second drainage pump (7) is arranged between the monitoring water tank (4) and the siphon well (10).

6. The auxiliary steam drain system of a nuclear power plant according to claim 2, characterized in that: The auxiliary steam drain system of the nuclear power plant further comprises a cooling water mixing device, which is connected to the drain collection well (3) and is used to supply cooling water to the drain collection well (3).

7. The auxiliary steam drain system of a nuclear power plant according to claim 6, characterized in that: The cold water mixing device comprises a cold water mixing source box (8), the outlet end of the cold water mixing source box (8) is connected to the drainage collection well (3), and the inlet end of the cold water mixing source box (8) is connected to the siphon well (10).

8. The auxiliary steam drain system of a nuclear power plant according to claim 7, characterized in that: The cold water mixing device also includes a cold water mixing pump (9), and the cold water mixing pump (9) is arranged between the cold water mixing source box (8) and the drainage collection well (3).

9. The auxiliary steam drain system of a nuclear power plant according to claim 7, characterized in that: The cold water mixing device further comprises a first switch valve and a second switch valve, wherein the first switch valve is arranged at the inlet end of the cold water mixing source box (8), and the second switch valve is arranged at the outlet end of the cold water mixing source box (8).

10. The auxiliary steam drain system of a nuclear power plant according to claim 7, characterized in that: The top of the cold water source box (8) is provided with a cold water inlet.

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