Large underground space air supply system of nuclear power unit

Abstract

The utility model discloses a large underground space air supply system of a nuclear power unit. The large underground space air supply system comprises a first fresh air pipeline, a second fresh air pipeline, a mixing pipeline, an air inlet chamber and an air supply pipeline. The first fresh air pipeline is provided with a surface air cooler and a first air feeder, the second fresh air pipeline is provided with a second air feeder, the air outlet end of the first air feeder and the air outlet end of the second air feeder are both connected with the first end of the mixing pipeline, the second end of the mixing pipeline is connected with an air inlet of the air inlet chamber, and an air outlet of the air inlet chamber is connected with the first end of the air supply pipeline. The second end of the air supply pipeline is used for being connected with a nuclear power unit large underground space. The scheme that one surface air cooler and two paths of fresh air are mixed is adopted, all fresh air does not need to be cooled and dehumidified, and needed energy consumption can be greatly reduced. Compared with treatment of a conventional ventilation system, high-temperature air is mixed through the second fresh air pipeline, the relative humidity of the mixed air is reduced, arrangement of an electric heater and the like can be omitted, and the influence on an original system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a large underground space air supply system for a nuclear power unit. Background Art

[0002] The important service water pump house of a nuclear power unit is a large underground space structure, in which heat generating equipment such as important service water pumps is arranged. One unit has two rows, and each row system is provided with two independent pump houses. The ventilation system of the important service water pump house is designed for mechanical air supply and natural exhaust, and the heat in the room is taken away by air cooling.

[0003] With the obvious trend of climate warming, the ventilation system of the important service water pump house exceeds the design reference temperature significantly, and the original summer design dry bulb temperature margin is insufficient. The original air cooling method cannot meet the room cooling demand. In addition, the pump house is not equipped with dehumidification equipment. When the environmental humidity is high, the humidity of the air sent into the pump house is too high, resulting in condensation and water accumulation on the walls and equipment in the pump house, affecting the safe operation of the equipment.

[0004] In view of this problem, the conventional treatment method is to set air conditioners, cooling coils, heaters, etc. on the ventilation system to control the temperature and humidity of the room. Through the air conditioner or cooling coil set on the air duct, the fresh air is cooled. The relative humidity of the cooled fresh air is relatively high, and the relative humidity needs to be reduced by other methods such as electric heating. Since the ventilation system of the important service water pump house is an open system, the ventilation does not circulate, the air volume is large, and the energy consumption is too high. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a large underground space air supply system for a nuclear power unit.

[0006] The technical solution adopted by the utility model to solve its technical problem is to construct a large underground space air supply system for a nuclear power unit, including a first fresh air duct, a second fresh air duct, a mixing duct, an air inlet chamber, and a air supply duct;

[0007] At least one surface cooler and at least one first air supply fan are provided on the first fresh air duct, at least one second air supply fan is provided on the second fresh air duct. The air outlet ends of the first air supply fan and the second air supply fan are both connected to the first end of the mixing duct. The second end of the mixing duct is connected to the air inlet of the air inlet chamber. The air outlet of the air inlet chamber is connected to the first end of the air supply duct. The second end of the air supply duct is used to be connected to the large underground space of the nuclear power unit.

[0008] In some embodiments, a filter is provided in the air inlet chamber. The filter divides the internal space of the air inlet chamber into a first space and a second space. The first space is provided with an air inlet, and the second space is provided with an air outlet.

[0009] In some embodiments, the first air blower is the same as the second air blower.

[0010] In some embodiments, at least one first temperature sensor is provided on one side of the first end of the first fresh air duct where it is located at the first end of the surface cooler.

[0011] In some embodiments, at least one second temperature sensor is provided on one side of the second end of the first fresh air duct where it is located at the second end of the surface cooler.

[0012] In some embodiments, at least one first humidity sensor is provided on one side of the first end of the first fresh air duct where it is located at the first end of the surface cooler.

[0013] In some embodiments, at least one second humidity sensor is provided on one side of the second end of the first fresh air duct where it is located at the second end of the surface cooler.

[0014] In some embodiments, at least one third temperature sensor is provided on the second fresh air duct.

[0015] In some embodiments, at least one third humidity sensor is provided on the second fresh air duct.

[0016] In some embodiments, at least one fourth temperature sensor is provided on the mixing duct, and / or at least one fourth humidity sensor is provided on the mixing duct.

[0017] Implementing the present utility model has the following beneficial effects: The large underground space air supply system of the nuclear power unit adopts a scheme of one surface cooler and two-way fresh air mixing. It is not necessary to cool and dehumidify all the fresh air, which can greatly reduce the required energy consumption. Compared with the treatment of a conventional ventilation system, by mixing high-temperature air through the second fresh air duct, the relative humidity of the air after mixing can be reduced, and the arrangement of electric heaters and the like can be saved, reducing the impact on the original system. The first fresh air duct and the second fresh air duct can be independently arranged, and fresh air can be sent into the original system through the mixing duct without major modification to the original system. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings. In the drawings:

[0019] Figure 1 is a schematic diagram of the large underground space air supply system of the nuclear power unit in some embodiments of the present utility model. Detailed Embodiments

[0020] In order to have a clearer understanding of the technical features, objectives and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation, and are only for the convenience of describing the technical solution, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0021] It should also be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. 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.

[0022] In the following description, specific details such as specific system structures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0023] Please refer to Figure 1 , the present utility model shows a large underground space air supply system for a nuclear power unit, which may include a first fresh air duct 10, a second fresh air duct 20, a mixing duct 30, an air inlet chamber 40, and an air supply duct 50.

[0024] The first fresh air duct 10 is provided with at least one surface cooler 11 and at least one first air blower 12. The second fresh air duct 20 is provided with at least one second air blower 21. The air outlet ends of the first air blower 12 and the second air blower 21 are both connected to the first end of the mixing duct 30, so that the mixing duct 30 can serve as a mixing section. The second end of the mixing duct 30 is connected to the air inlet of the air inlet chamber 40. The air outlet of the air inlet chamber 40 is connected to the first end of the air supply duct 50. The second end of the air supply duct 50 is used to connect to the large underground space of the nuclear power unit. Preferably, the number of the surface cooler 11, the first air blower 12, and the second air blower 21 is one each.

[0025] Understandably, the surface cooler 11 and the first air blower 12 are independently arranged in the first fresh air duct 10, which can achieve temperature reduction and humidity control. The fresh air is condensed and cooled by the surface cooler 11 to the dew point, the excess moisture in the air is discharged, and the air temperature and absolute humidity content are reduced.

[0026] The second fresh air duct 20 can serve as a bypass pipeline, mainly for temperature adjustment. It is mixed with the first fresh air duct 10 in the mixing duct 30 to mix the temperature and humidity of the air to the required temperature.

[0027] The mixed fresh air is sent into the air inlet chamber 40 through the mixing duct 30, and then sent into the large underground space of the nuclear power unit (such as the underground pump station space) through the air supply duct 50 (the original system air duct). The cold air sent in cools and controls the humidity of the environment of the large underground space of the nuclear power unit, avoiding too high temperature and humidity in the large underground space of the nuclear power unit. The large underground space of the nuclear power unit may include a first underground pump station space 100 and a second underground pump station space 200. The air supply duct 50 is provided with a first duct 51 connecting to the first underground pump station space 100, and a third air blower 52 is provided on the first duct 51. The air supply duct 50 is provided with a second duct 53 connecting to the second underground pump station space 200, and a fourth air blower 54 is provided on the second duct 53.

[0028] In some embodiments, a filter 41 is provided in the air inlet chamber 40. The filter 41 defines a first space 40a and a second space 40b in the internal space of the air inlet chamber 40. The first space 40a is provided with an air inlet, and the second space 40b is provided with an air outlet. The air inlet is connected to the second end of the mixing duct 30, and the air outlet is connected to the first end of the air supply duct 50.

[0029] In some embodiments, the first air blower 12 and the second air blower 21 are the same, and their specifications are the same. The same specifications are convenient for installation and construction. Or the specifications of the first air blower 12 and the second air blower 21 can also be different, which can be selected according to actual needs and will not be specifically limited here.

[0030] In some embodiments, at least one first temperature sensor 13 is provided on one side of the first end of the first fresh air duct 10 where it is located at the first end of the surface cooler 11. The first temperature sensor 13 can monitor the temperature of the fresh air that has not been processed by the surface cooler 11. The number of the first temperature sensors 13 provided can be one, two, or any other number, and no specific limitation is made here.

[0031] In some embodiments, at least one second temperature sensor 14 is provided on one side of the second end of the first fresh air duct 10 where it is located at the second end of the surface cooler 11. The second temperature sensor 14 can monitor the temperature of the fresh air that has been processed by the surface cooler 11. The number of the second temperature sensors 14 provided can be one, two, or any other number, and no specific limitation is made here.

[0032] In some embodiments, at least one first humidity sensor 15 is provided on one side of the first end of the first fresh air duct 10 where it is located at the first end of the surface cooler 11. The first humidity sensor 15 can monitor the humidity of the fresh air that has not been processed by the surface cooler 11. The number of the first humidity sensors 15 provided can be one, two, or any other number, and no specific limitation is made here.

[0033] In some embodiments, at least one second humidity sensor 16 is provided on one side of the second end of the first fresh air duct 10 where it is located at the second end of the surface cooler 11. The second humidity sensor 16 can monitor the humidity of the fresh air that has been processed by the surface cooler 11. The number of the second humidity sensors 16 provided can be one, two, or any other number, and no specific limitation is made here.

[0034] In some embodiments, at least one third temperature sensor 22 is provided on the second fresh air duct 20. The third temperature sensor 22 can monitor the temperature of the fresh air in the second fresh air duct 20. The number of the third temperature sensors 22 provided can be one, two, or any other number, and no specific limitation is made here.

[0035] In some embodiments, at least one third humidity sensor 23 is provided on the second fresh air duct 20. The third humidity sensor 23 can monitor the humidity of the fresh air in the second fresh air duct 20. The number of the third humidity sensors 23 provided can be one, two, or any other number, and no specific limitation is made here.

[0036] In some embodiments, at least one fourth temperature sensor 31 is provided on the mixing duct 30, and / or at least one fourth humidity sensor 32 is provided on the mixing duct 30. The fourth temperature sensor 31 can monitor the fresh air temperature of the mixing duct 30. The number of the fourth temperature sensors 31 provided can be one, two or any other number, which is not specifically limited herein. The fourth humidity sensor 32 can monitor the fresh air humidity of the mixing duct 30. The number of the fourth humidity sensors 32 provided can be one, two or any other number, which is not specifically limited herein.

[0037] The large underground space air supply system of the nuclear power unit adopts a scheme of one path of surface cooler and two paths of fresh air mixing, without the need to cool and dehumidify all the fresh air, which can greatly reduce the required energy consumption.

[0038] Compared with the treatment of the conventional ventilation system, by mixing the hot air in the second fresh air duct 20, the relative humidity of the air after mixing can be reduced, the arrangement of electric heaters and the like can be saved, and the influence on the original system can be reduced.

[0039] The first fresh air duct 10 and the second fresh air duct 20 can be independently arranged, and the fresh air can be sent into the original system through the mixing duct 30 without major modification to the original system.

[0040] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A large underground air supply system for a nuclear power unit, characterized in that: It comprises a first fresh air duct (10), a second fresh air duct (20), a mixing duct (30), an air inlet chamber (40), and an air supply duct (50); The first fresh air duct (10) is provided with at least one surface cooler (11) and at least one first air supply fan (12); the second fresh air duct (20) is provided with at least one second air supply fan (21); the air outlet end of the first air supply fan (12) and the air outlet end of the second air supply fan (21) are connected to the first end of the mixing duct (30); the second end of the mixing duct (30) is connected to the air inlet of the air inlet chamber (40); the air outlet of the air inlet chamber (40) is connected to the first end of the air supply duct (50); and the second end of the air supply duct (50) is used to be connected to a large underground space of a nuclear power unit.

2. The large underground air supply system for nuclear power units according to claim 1, characterized in that: A filter (41) is provided in the air inlet chamber (40), and the filter (41) defines the internal space of the air inlet chamber (40) into a first space (40a) and a second space (40b), wherein the first space (40a) is provided with an air inlet, and the second space (40b) is provided with an air outlet.

3. The large underground air supply system for nuclear power units according to claim 1, characterized in that: The first air blower (12) is the same as the second air blower (21).

4. The large underground air supply system for a nuclear power plant according to claim 1, characterized in that: At least one first temperature sensor (13) is provided on one side of the first end of the first fresh air duct (10) located at the surface cooler (11).

5. The large underground air supply system for nuclear power units according to claim 1, characterized in that: At least one second temperature sensor (14) is provided on one side of the second end of the first fresh air duct (10) located at the surface cooler (11).

6. The large underground air supply system for nuclear power units according to claim 1, characterized in that: At least one first humidity sensor (15) is provided on one side of the first end of the first fresh air duct (10) located at the surface cooler (11).

7. The large underground air supply system for nuclear power units according to claim 1, characterized in that: At least one second humidity sensor (16) is provided on one side of the second end of the first fresh air duct (10) located at the surface cooler (11).

8. The large underground air supply system for a nuclear power plant according to claim 1, characterized in that: The second fresh air duct (20) is provided with at least one third temperature sensor (22).

9. The large underground air supply system for a nuclear power plant according to claim 1, characterized in that: The second fresh air duct (20) is provided with at least one third humidity sensor (23).

10. The large underground air supply system for a nuclear power plant according to claim 1, characterized in that: At least one fourth temperature sensor (31) is provided on the mixing pipe (30), and / or at least one fourth humidity sensor (32) is provided on the mixing pipe (30).

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