Double-sided air intake circulating cooling unit for nuclear power plant

Abstract

The utility model belongs to the technical field of cooling unit, concretely relates to a double -sided air -intaking circulating cooling unit for nuclear power station, including unit base and unit box, the unit box is barrel -shaped structure, and the opening side of unit box is connected with unit base buckle, and unit base is provided with the through -hole and forms the air outlet, the opposite sides wall of unit box is provided with the air inlet symmetrically, and the air inlet is covered with air -intaking treatment subassembly, the utility model discloses the design of unit box double -sided air -intaking makes filter, cooler two -sided air -intaking, can reduce the cross -sectional dimension of circulating cooling unit under the condition that total air -intaking area is invariable, thereby making circulating cooling unit can be arranged in the annular corridor of inside safety shell.

Description

Technical Field

[0001] This utility model belongs to the field of cooling unit technology, specifically relating to a double-sided air-intake circulating cooling unit for nuclear power plants. Background Technology

[0002] During the operation of a nuclear power plant, a large number of large pieces of equipment are installed in the reactor building, which continuously generate a large amount of heat during operation. To ensure the safe and stable operation of the nuclear power plant, it is necessary to control the ambient temperature inside the reactor building within a reasonable range. Therefore, the circulating cooling unit is an indispensable cooling device in the reactor building, and its performance directly affects the normal operating efficiency and safety factor of the nuclear power plant.

[0003] Currently, conventional circulating cooling units mostly adopt a single-sided air intake design, which results in a large overall width of the unit. However, the inner containment vessel of the reactor building usually has an annular corridor, which is narrow, making it difficult to install conventional single-sided air intake cooling units due to their large size. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a double-sided air intake circulating cooling unit for nuclear power plants. By adopting a double-sided air intake design for the unit casing, air can be introduced from both sides of the filter and cooler. Without changing the total air intake area, the cross-sectional size of the circulating cooling unit can be reduced, thereby enabling the circulating cooling unit to be arranged in the annular corridor of the inner containment.

[0005] The specific technical solution adopted in this utility model is as follows:

[0006] A circulating cooling unit with double-sided air intake for nuclear power plants includes a unit base and a unit housing. The unit housing has a barrel-shaped structure, and the open side of the unit housing is fastened to the unit base. The unit base is provided with through holes to form air outlets. Air inlets are symmetrically arranged on opposite side walls of the unit housing, and air inlets are covered with air intake treatment components.

[0007] The unit housing has a frustum-shaped structure that is narrower at the top and wider at the bottom, and the angle between the air inlet side of the unit housing and the vertical plane is 8-12°.

[0008] The air intake treatment assembly includes a cooler and a filter, with the filter disposed on the air intake side of the cooler.

[0009] The cooler includes an inlet pipe, an outlet pipe, and a heat exchange pipe. The inlet pipe is connected to the input end of the heat exchange pipe, and the outlet pipe is connected to the output end of the heat exchange pipe. The inlet pipe, outlet pipe, and heat exchange pipe are fixedly connected to the unit housing by means of a fixing plate.

[0010] The filter includes a filter screen and a filter frame. The filter frame has a grid structure. The filter screen is nested and fixed in the mesh of the filter frame. Multiple filter screens are fixedly connected by the filter frame to form an integral filter surface. The filter surface covers the air inlet side of the cooler. The air inlet of the unit housing is divided into several independent air inlet areas by the filter frame.

[0011] The air intake treatment assembly also includes a baffle plate located on the air outlet side of the cooler. A drainage trough and a drainage pipe are provided on the unit base below the baffle plate. The drainage trough collects the condensate intercepted by the baffle plate and discharges it through the drainage pipe.

[0012] The baffle plate has a wave-like structure, and multiple sets of baffle plates are arranged at intervals. A wave-like condensation channel is formed between adjacent baffle plates, and the bottom of the condensation channel is connected to the drainage trough.

[0013] The unit housing is also equipped with guide vanes. The guide vanes have an arc-shaped structure. The two sides of the guide vanes are fixedly connected to the inner wall of the unit housing. The input end of the guide vanes is connected to the air inlet of the unit housing and is tangent to the airflow input direction. The output end of the guide vanes is connected to the air outlet of the unit housing. Multiple sets of guide vanes are arranged at intervals along the direction perpendicular to the airflow. The gap between adjacent guide vanes forms a guide channel, and the airflow flows along the guide channel to the air outlet.

[0014] The unit housing has an inspection door on its side wall, and the inspection door has the freedom to open and close.

[0015] The beneficial effects of this utility model are:

[0016] 1. The cooling unit in this utility model adopts a double-sided air intake design, which allows air to enter the filter and cooler from both sides. Without changing the total air intake area, the cross-sectional size of the circulating cooling unit can be reduced, so that the circulating cooling unit can be arranged in the annular corridor of the inner containment.

[0017] 2. This utility model includes an additional airflow guide channel. The airflow guide channel guides the cooled airflow to the air outlet of the unit base. Since the air inlets in this utility model are symmetrically arranged on both sides, the airflow from both sides will collide in the unit housing, causing airflow turbulence and vibration. This causes vibration and noise in the unit housing, as well as loss of kinetic energy. Therefore, it is necessary to install airflow guide vanes. The airflow guide channel prevents the airflow from contacting the airflow on both sides of the unit housing, and also prevents the airflow above and below the air inlet on the same side from contacting, thus avoiding airflow turbulence and vibration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of specific embodiment 1;

[0019] Figure 2 This is a schematic diagram of the right-side structure of specific embodiment 1;

[0020] Figure 3 This is a top view of the structure of specific embodiment 1;

[0021] Figure 4 This is a top view of the water baffle structure.

[0022] Figure 5 This is a schematic diagram of the main structure of embodiment 2;

[0023] In the attached diagram, 1 is the unit base, 2 is the unit housing, 3 is the filter screen, 4 is the filter frame, 5 is the inlet pipe, 6 is the outlet pipe, 7 is the heat exchange pipe, 8 is the fixing plate, 9 is the baffle plate, 10 is the drainage trough, 11 is the drainage pipe, 12 is the guide vane, and 13 is the inspection door. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] Specific embodiment 1, such as Figure 1-3 As shown, this utility model provides a double-sided air-intake circulating cooling unit for nuclear power plants, including a unit base 1 and a unit housing 2. The unit housing 2 has a barrel-shaped structure, and the open side of the unit housing 2 is fastened to the unit base 1. The unit base 1 is provided with through holes to form air outlets. Air inlets are symmetrically arranged on the opposite side walls of the unit housing 2, and air inlets are covered with air intake treatment components.

[0026] Currently, conventional circulating cooling units mostly adopt a single-sided air intake design, which results in a large overall width of the unit. However, the inner containment vessel of the reactor building usually has an annular corridor, which is narrow, making it difficult to install conventional single-sided air intake cooling units due to their large size.

[0027] Therefore, the cooling unit in this utility model adopts a double-sided air intake design, which allows air to enter the filter and cooler from both sides. Without changing the total air intake area, the cross-sectional size of the circulating cooling unit can be reduced, so that the circulating cooling unit can be arranged in the annular corridor of the inner containment.

[0028] Meanwhile, when airflow enters the unit, it needs to overcome the local resistance at the air inlet. When airflow enters from one side, all airflow must be concentrated through a single air inlet, and the local resistance coefficient is large due to the concentrated impact of the airflow. However, when airflow enters from both sides, the airflow is dispersed to two air inlets, and the resistance on one side is reduced. The reduction in resistance will cause the airflow velocity to increase. Therefore, airflow from both sides increases the airflow entering the unit per unit time, increases the opportunity for heat exchange between the airflow and the cooler, and increases the heat exchange per unit time.

[0029] like Figure 1 As shown, the unit housing has a frustum-shaped structure that is narrower at the top and wider at the bottom, and the angle between the air inlet side of the unit housing 2 and the vertical plane is 8-12°.

[0030] Since the cooling unit needs to be placed in the annular corridor, the truncated cone-shaped structure, which is narrow at the top and wide at the bottom, allows the head of the unit's casing to easily enter the annular corridor, thus serving as a positioning feature.

[0031] Furthermore, the air inlet is located on the side wall of the unit housing 2, while the air outlet is located at the bottom of the unit housing 2. Therefore, the tilt angle creates an initial path for the incoming airflow to flow diagonally downwards. After entering the unit housing 2, the airflow will naturally flow towards the bottom air outlet under the combined effect of gravity and the internal air pressure difference. At the same time, it can prevent the two airflows on both sides from forming turbulent interference at the center of the unit housing 2, reducing the generation of noise and vibration.

[0032] The air intake treatment assembly includes a cooler and a filter, with the filter disposed on the air intake side of the cooler.

[0033] like Figure 1-3 As shown, the cooler includes an inlet pipe 5, an outlet pipe 6, and a heat exchange pipe 7. The inlet pipe 5 is connected to the input end of the heat exchange pipe 7, and the outlet pipe 6 is connected to the output end of the heat exchange pipe 7. The inlet pipe 5, the outlet pipe 6, and the heat exchange pipe 7 are fixedly connected to the unit housing 2 by means of a fixing plate 8.

[0034] Multiple heat exchange tubes are arranged in a grid pattern along the vertical direction of the air inlet. The fixing plate spans across the unit housing on the side of the air inlet. The fixing plate has through holes for the heat exchange tubes to pass through. The heat exchange tubes are fixed to the air inlet by means of the fixing plate. The filter frame is supported on the end face of the fixing plate and is fixedly connected to the unit housing by means of the fixing plate.

[0035] like Figure 1-3 As shown, the filter includes a filter screen 3 and a filter frame 4. The filter frame 4 has a mesh structure. The filter screen 3 is nested and fixed in the mesh of the filter frame 4. Multiple filter screens 3 are fixedly connected by the filter frame 4 to form an integral filter surface. The filter surface covers the air inlet side of the cooler. The air inlet of the unit housing 2 is divided into several independent air inlet areas by the filter frame 4.

[0036] The mesh-like filter frame 4 divides the incoming airflow into multiple independent small air intake areas. Each area corresponds to an independent filter screen 3 and a downstream cooler area. This distribution makes the incoming airflow more orderly when entering the unit housing 2, avoiding the problem of small airflow at the edges and large airflow at the center when passing through a large-diameter air intake. This ensures that the airflow passes evenly through each filter screen 3 and cooler area, improving cooling efficiency.

[0037] like Figure 1 As shown, the air intake treatment assembly also includes a baffle plate 9, which is located on the air outlet side of the cooler. A drain trough 10 and a drain pipe 11 are provided on the unit base 1 below the baffle plate 9. The drain trough 10 collects the condensate intercepted by the baffle plate 9 and discharges it through the drain pipe 11.

[0038] After the airflow is cooled by the cooler, condensate will be generated. When the airflow speed is high, it will carry some condensate. The baffle plate 9 can block the condensate to prevent it from entering the unit and affecting the electrical components or the stability of the airflow. The drain trough 10 and the drain pipe 11 work together to discharge the intercepted condensate and prevent the accumulation of condensate from causing equipment corrosion.

[0039] like Figure 4 As shown, the baffle plate 9 has a wave-like structure, and multiple sets of baffle plates 9 are arranged at intervals. A wave-like condensation channel is formed between adjacent baffle plates 9, and the bottom of the condensation channel is connected to the drainage trough 10.

[0040] When airflow containing condensate passes through the baffle, the airflow needs to change direction due to the obstruction of the baffle. However, due to its greater inertia, the water droplets are difficult to change direction synchronously with the airflow and will directly hit the crest of the wave-shaped baffle. Under the action of gravity, they will slide down the baffle into the drainage trough, preventing the condensate from drifting to the fan section due to excessive wind speed.

[0041] like Figure 1 As shown, an inspection door 13 is provided on the side wall of the unit housing 2, and the inspection door 13 has the freedom to open and close. When maintenance is required, the unit is stopped, and then the inspection door 13 is opened.

[0042] Specific embodiment 2 differs from specific embodiment 1 in that, as follows: Figure 5 As shown, a guide vane 12 is also provided in the cavity of the unit housing 2. The guide vane 12 has an arc-shaped structure. The two sides of the guide vane 12 are fixedly connected to the inner wall of the unit housing 2. The input end of the guide vane 12 is connected to the air inlet of the unit housing 2. The input end of the guide vane 12 is tangent to the airflow input direction. The output end of the guide vane 12 is connected to the air outlet of the unit housing 2. Multiple sets of guide vanes 12 are arranged at intervals along the direction perpendicular to the airflow. The gap between adjacent guide vanes 12 forms a guide channel. The airflow flows along the guide channel to the air outlet.

[0043] The airflow guide channel serves two purposes: firstly, it guides the airflow, directing the cooled airflow to the air outlet of the unit base 1; secondly, since the air inlets in this invention are symmetrically arranged on both sides, the airflow from both sides will collide within the unit housing 2, resulting in turbulence and disturbance. This causes vibration and noise in the unit housing 2, as well as loss of kinetic energy of the airflow. Therefore, it is necessary to install the airflow guide vane 12 to prevent the airflow from contacting each other on both sides of the unit housing 2 through the airflow guide channel. It also prevents the airflow above and below the air inlet on the same side from contacting each other, thus avoiding the generation of airflow turbulence and disturbance.

Claims

1. A double-sided air-intake circulating cooling unit for a nuclear power plant, comprising a unit base (1) and a unit housing (2), wherein the unit housing (2) has a barrel-shaped structure, the open side of the unit housing (2) is fastened to the unit base (1), and the unit base (1) is provided with through holes to form air outlets, characterized in that, The unit housing (2) has symmetrical air inlets on opposite side walls, and the air inlets are covered with air intake treatment components.

2. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 1, characterized in that, The unit housing (2) has a frustum-shaped structure that is narrow at the top and wide at the bottom, and the angle between the air inlet side of the unit housing (2) and the vertical plane is 8-12°.

3. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 1, characterized in that, The air intake treatment assembly includes a cooler and a filter, with the filter disposed on the air intake side of the cooler.

4. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 3, characterized in that, The cooler includes an inlet pipe (5), an outlet pipe (6), and a heat exchange pipe (7). The inlet pipe (5) is connected to the input end of the heat exchange pipe (7), and the outlet pipe (6) is connected to the output end of the heat exchange pipe (7). The inlet pipe (5), the outlet pipe (6), and the heat exchange pipe (7) are fixedly connected to the unit housing (2) by means of a fixing plate (8).

5. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 3, characterized in that, The filter includes a filter screen (3) and a filter frame (4). The filter frame (4) has a mesh structure. The filter screen (3) is nested and fixed in the mesh of the filter frame (4). Multiple filter screens (3) are fixedly connected by the filter frame (4) to form an integral filter surface. The filter surface covers the air inlet side of the cooler. The air inlet of the unit housing (2) is divided into several independent air inlet areas by the filter frame (4).

6. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 3, characterized in that, The air intake treatment assembly also includes a baffle plate (9), which is located on the air outlet side of the cooler. A drain trough (10) and a drain pipe (11) are provided on the base (1) of the unit below the baffle plate (9). The drain trough (10) collects the condensate intercepted by the baffle plate (9) and discharges it through the drain pipe (11).

7. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 6, characterized in that, The baffle plate (9) has a wave-like structure. Multiple sets of baffle plates (9) are arranged at intervals. A wave-like condensation channel is formed between adjacent baffle plates (9). The bottom of the condensation channel is connected to the drainage trough (10).

8. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 1, characterized in that, The chamber of the unit housing (2) is also provided with a guide vane (12). The guide vane (12) has an arc-shaped structure. The two sides of the guide vane (12) are fixedly connected to the inner wall of the unit housing (2). The input end of the guide vane (12) is connected to the air inlet of the unit housing (2). The input end of the guide vane (12) is tangent to the airflow input direction. The output end of the guide vane (12) is connected to the air outlet of the unit housing (2). Multiple sets of guide vanes (12) are arranged at intervals along the direction perpendicular to the airflow. The gap between adjacent guide vanes (12) forms a guide channel. The airflow flows along the guide channel to the air outlet.

9. A double-sided air-intake circulating cooling unit for nuclear power plants according to claim 1, characterized in that, The unit housing (2) is provided with an inspection door (13) on its side wall, and the inspection door (13) has the freedom to open and close.

Images