Antifreeze system for natural draft cooling tower

Abstract

The present invention discloses an antifreeze system for a natural ventilation cooling tower, the main points of which are: it includes an antifreeze pipe assembly and a water baffle. The water spray pipeline of the antifreeze pipe assembly is arranged in a circle on the inner side of the lower edge of the tower wall above the herringbone column of the air inlet of the natural ventilation cooling tower, near the tower wall corbel and below the bottom support beam of the filler. The water spray pipeline is provided with a plurality of water spray ports facing inward and downward. There are a plurality of water baffles, each of which is connected end to end in sequence and arranged around the outer circumference of the filler to separate the filler from the tower wall. Each water baffle is fixedly arranged between the tower wall and the bottom support beam, and the angle between the water baffle and the vertical direction is 0 to 8 degrees. The lower end of the water baffle is located radially on the inner side of the water spray pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of cooling towers, in particular to an antifreeze system for a natural ventilation cooling tower. Background Art

[0002] A natural draft cooling tower is a cooling tower that is ventilated by the air density difference inside and outside the tower or the air convection formed by natural wind. In a natural draft cooling tower, the water spraying device is generally installed inside the cooling tower body, and the air flows from bottom to top in the opposite direction of the water spraying, which is called countercurrent ventilation. Large natural draft cooling towers are mostly built with reinforced concrete, and most of them are hyperbolic cylinders. Take the working process of a circular countercurrent cooling tower as an example: hot water is pumped from the main engine room through pipes, horizontal throats, curved throats, and center throats to press the circulating water into the water spreading system of the cooling tower at a certain pressure, and the water is evenly spread on the filler through the small holes on the water spreading pipe; dry low enthalpy air enters the tower from the bottom air inlet net under the action of the fan, and the hot water forms a water film and exchanges heat with the air when it flows through the surface of the filler. The hot air with high humidity and high enthalpy is extracted from the top, and the cooling water drips into the bottom basin and flows into the main engine through the outlet pipe.

[0003] Winters in the north are relatively cold, which poses a certain threat to the operation of the natural ventilation cooling tower of the circulating water system. How to operate the natural ventilation cooling of the circulating water system in the north in winter has always been a difficult problem. Because the temperature is too low, ice will form around the packing of the cooling tower, resulting in a reduction in the working area of ​​the packing, reducing the flow rate of hot water flowing through the packing, affecting the heat dissipation efficiency, and ice will increase the weight of the packing, increase the load of the tower structure, reduce the service life of the concrete structure, and cause safety hazards to the tower load. In addition, it may cause freezing and cracking of pipes and valves. Corresponding anti-freeze measures need to be taken. At present, most of them are installed with windshields outside the air inlet herringbone columns. The anti-freeze effect of installing windshields is better, but they must be disassembled and assembled once in winter and summer, which is more troublesome to manage, and the windshields are easy to deform and damage during storage and transportation, and are not easy to keep. Summary of the invention

[0004] The object of the present invention is to provide an antifreeze system for a natural ventilation cooling tower which has a simple structure and can effectively prevent icing.

[0005] The basic technical scheme for achieving the purpose of the present invention is: an antifreeze system for a natural ventilation cooling tower, which has the following structural features: it includes an antifreeze pipe assembly and a water baffle. The water spray pipeline of the antifreeze pipe assembly is arranged in a circle on the inner side of the lower edge of the tower wall above the herringbone column of the air inlet of the natural ventilation cooling tower, near the tower wall corbel and below the bottom support beam of the filler. The water spray pipeline is provided with a plurality of water spray ports facing inward and downward. There are a plurality of water baffles, each of which is connected end to end in sequence and arranged around the outer circumference of the filler to separate the filler from the tower wall. Each water baffle is fixedly arranged between the tower wall and the bottom support beam, and the angle between the water baffle and the vertical direction is 0 to 8 degrees, and the lower end of the water baffle is located radially on the inner side of the water spray pipeline.

[0006] The technical scheme based on the above basic technical scheme is: there are 8 groups of antifreeze pipe assemblies, each of which has the same structure and includes valves, valve connecting pipes and water spraying pipelines. The water spraying pipelines of the 8 groups of antifreeze pipe assemblies are arranged in a circle on the inner side of the lower edge of the tower wall above the herringbone column of the air inlet of the natural ventilation cooling tower, near the tower wall bracket and the bottom support beam of the filler. The water spraying pipeline of each group of antifreeze pipe assemblies is in an arc shape of one eighth. The main water tank of the natural ventilation cooling tower is arranged in a cross-shaped distribution, and the plane where it is located is divided into 4 quadrants. Every 2 groups of antifreeze pipe assemblies are arranged in the same quadrant in an axisymmetric manner. The valve is made of stainless steel. The valve is fixedly arranged on the side wall of the corresponding side of the end of the main water tank through a gate valve frame. The water inlet of the valve is sealed and connected to the main water tank. One end of the water inlet of the valve connecting pipe is sealed and connected to the water outlet of the valve, and the water outlet at the other end passes downward through the filler and the bottom support beam of the cooling tower, and the water outlet is arranged outward along the radial direction of the cooling tower and connected to the water spraying pipeline.

[0007] The technical solution based on the above corresponding technical solution is: the valve adopts a high-position door rod and a manually operated hand wheel to control its opening and closing.

[0008] The technical solution based on the above corresponding technical solution is: the water spray pipeline includes a head end water spray pipe, an intermediate water spray pipe and a terminal water spray pipe. There are several intermediate water spray pipes, and the central angle α corresponding to each intermediate water spray pipe is 3 degrees. The head end water spray pipe, the intermediate water spray pipe and the terminal water spray pipe are connected end to end in a socket-and-spigot type in sequence to form an arc shape, and are fixedly connected to each other by flanges and sealed to form a water spray pipeline.

[0009] The technical solution based on the above corresponding technical solution is: the first end water spray pipe, the middle water spray pipe and the end water spray pipe are all made of fiber-wound glass fiber reinforced plastic pipes. The first end water spray pipe, the middle water spray pipe and the end water spray pipe are all fixed to the corresponding support beams below the inner packing of the tower wall through stainless steel belts.

[0010] The head end water spray pipe is T-shaped, and the middle water inlet of the head end water spray pipe is sealed and connected with the lower water outlet of the valve connecting pipe. One end of the head end water spray pipe close to the main water tank connected to the valve is sealed and closed with a corresponding head end blanking plate, and the other end of the head end water spray pipe away from the main water tank connected to the valve is fixedly connected to a corresponding middle water spray pipe through a flange and sealed and connected. The head end water spray pipe is provided with a plurality of head end water spray ports opening inward and downward. The angle β between the head end water spray port and the vertical direction is 0 degrees to 45 degrees, and the cross-section shape of the head end water spray port is rectangular, and the cross section is trapezoidal. The spacing between each head end water spray port is 100 to 300 mm.

[0011] The middle water spray pipe is provided with a plurality of middle water spray ports opening inwardly and downwardly. The angle γ between the middle water spray ports and the vertical direction is 0 to 45 degrees, and the cross-section of the middle water spray ports is rectangular and the cross-section is trapezoidal. The spacing between the middle water spray ports is the same as the spacing between the head end water spray ports, and the distance between the middle water spray ports on the adjacent middle water spray pipes and the head end water spray ports on the head end water spray pipe is equal to the spacing between the head end water spray ports.

[0012] The end of the terminal water spray pipe away from the main water tank connected to the valve is sealed and closed by a corresponding terminal baffle. The terminal water spray pipe is provided with a plurality of terminal water spray ports opening inward and downward. The angle δ between the terminal water spray ports and the vertical direction is 0 degrees to 45 degrees. The cross-sectional shape of the terminal water spray ports is rectangular and the cross-section is trapezoidal. The spacing between each terminal water spray port is the same as the spacing between the first end water spray ports, and the distance between the terminal water spray ports on the adjacent terminal water spray pipes and the middle water spray ports on the middle water spray pipe is equal to the spacing between the first end water spray ports.

[0013] The present invention has the following beneficial effects: (1) The antifreeze system of the natural ventilation cooling tower of the present invention has a simple structure and does not require additional energy consumption. The hot water in the main water tank is used to form a hot water curtain to block cold air from entering the tower, effectively preventing ice from forming. The filler is separated from the tower wall by a water baffle. On the one hand, the water in the filler can fall into the inner side of the water spray pipe to prevent the water around the filler from freezing. On the other hand, the water baffle can effectively prevent water from flowing toward the tower wall, preventing water from flowing down the tower wall and causing the tower wall, tower wall brackets and herringbone columns to freeze, further improving the safety of use.

[0014] (2) The water spray pipeline of the natural ventilation cooling tower of the present invention is arranged on the inner side of the upper edge of the outer air inlet of the cooling tower, near the tower wall bracket and the bottom support beam of the filler. The water spray pipe of the antifreeze pipeline adopts a fiber-wound glass fiber reinforced plastic pipe. The circulating water in the main water tank enters the water spray pipeline through a valve control. A number of water spray ports are opened on the water spray pipeline facing inward and downward. The water spray ports are spaced 200mm apart. The cross-section of the water spray ports is rectangular and the cross-section is trapezoidal, so that the sprayed water flow is radial. Water flows cross between adjacent water spray ports, forming a hot water curtain as a whole, blocking cold air from entering the tower, playing a role in preventing ice from forming and hanging, and the effect is remarkable. In addition, a water retaining plate is set above the antifreeze pipe near the tower wall to prevent water from flowing along the tower wall and ensure the antifreeze efficiency of the antifreeze pipe.

[0015] (3) The hot water source in the spray pipe of the antifreeze system of the natural ventilation cooling tower of the present invention comes from the main water tank when the water supply method adopts the peripheral water supply in winter. The water is supplied according to the four quadrants arranged in the plane of the main water tank. Each peripheral main water tank supplies the hot water of the spray pipe of one eighth on both sides, which can effectively ensure the heat of the water sprayed in the spray pipe, and avoid the water temperature sprayed at the end of the spray pipe being greatly reduced due to the long pipe, which affects the use effect. During the test of the present invention, the circulating water supply of the whole cooling tower is 23200 cubic meters per hour, the diameter of the spray pipe is 300 mm, the pipe wall thickness is not less than 6 mm, the whole tower is divided into 8 groups, the flow rate of each group of spray pipes is 708 cubic meters per hour, the flow rate in the pipe is 1.56 meters per second, the flow rate of the water spray port is 3.31 cubic meters per hour, and the total flow rate of the spray pipe is 5560 cubic meters per hour, accounting for 24% of the flow rate of the whole tower, blocking the cold air while also playing a cooling role.

[0016] (4) The antifreeze pipeline of the antifreeze system of the natural ventilation cooling tower of the present invention is arranged in a circle and divided into 8 sections. One end of each section is connected to a valve, and the other end adopts an end plate. When sewage needs to be discharged, the valve is closed, the water source is cut off, and the end plate at the other end is opened. All water spray outlets can be unclogged with tools, and then the valve is opened to flush the dirt in the water spray pipeline with circulating water. After flushing, the valve is closed again, and the end plate at the other end is installed and sealed to extend the service life and ensure the water spray effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a natural ventilation cooling tower.

[0018] Figure 2 for Figure 1 Schematic diagram of the vertical cross-sectional structure at point A in FIG.

[0019] Figure 3 For Figure 1 Schematic diagram of the structure of the antifreeze pipe assembly of the antifreeze system when viewed from above.

[0020] Figure 4 It is a schematic diagram of the arrangement structure of the antifreeze pipe assembly of the antifreeze system in a quadrant.

[0021] Figure 5 for Figure 4 BB cross-sectional view in .

[0022] Figure 6 for Figure 4 Schematic diagram of CC cross-section in .

[0023] Figure 7 for Figure 4 DD cross-sectional view in .

[0024] Figure 8 This is a schematic diagram of the end face of the first end water spray pipe.

[0025] Fig. 9 for Figure 8 Schematic diagram of the left side.

[0026] Fig.10 This is a schematic diagram of the end face of the middle water spray pipe.

[0027] Fig.11 for Fig.10 Schematic diagram of the left side.

[0028] Fig.12 This is a schematic diagram of the end face of the end water spray pipe.

[0029] Fig.13 for Fig.12 Schematic diagram of the left side.

[0030] Fig.14 Another structural schematic diagram of the antifreeze pipe assembly of the antifreeze system of the present invention.

[0031] The reference numerals in the accompanying drawings are:

[0032] Antifreeze pipe assembly 1,

[0033] Valve 1-1, gate valve rack 1-11,

[0034] Valve connecting pipe 1-2,

[0035] Water spray pipes 1-3,

[0036] The first end water spray pipe 1-31, the first end baffle 1-31-1, the first end water spray port 1-31-2,

[0037] Middle water spray pipe 1-32, middle water spray port 1-32-1,

[0038] End water spray pipe 1-33, end baffle 1-33-1, end water spray port 1-33-2,

[0039] Water retaining plate 2,

[0040] Natural ventilation cooling tower 10, main water tank 10-1, filler 10-2, bottom support beam 10-21, tower wall corbel 10-3, air inlet 10-4. DETAILED DESCRIPTION

[0041] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings. Figure 1 The direction shown is carried out, that is, Figure 1 The up, down, left, and right directions shown are the up, down, left, and right directions described. Figure 1 The direction is forward, away from Figure 1 The side that is at the rear is the one at the rear.

[0042] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] It should be understood that terms such as "upper", "lower", "inside" and "outside" to indicate directions or positional relationships are based on the positional relationships described in the drawings and are only used to facilitate the description of the present invention or simplify the description, rather than to indicate a specific direction that must be possessed.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. In the event of a conflict, the definitions in the present specification shall prevail.

[0046] (Example 1)

[0047] See Figures 1 to 13 The antifreeze system of the natural ventilation cooling tower of the present invention includes an antifreeze pipe assembly 1 and a water baffle 2.

[0048] See Figures 2 to 13There are 8 groups of antifreeze pipe assemblies 1, each group has the same structure, including valves 1-1, valve connecting pipes 1-2 and water spray pipes 1-3. The water spray pipes 1-3 of the 8 groups of antifreeze pipe assemblies 1 are arranged in a circle on the inner side of the lower edge of the tower wall above the air inlet 10-4 herringbone column of the natural ventilation cooling tower 10, near the tower wall bracket 10-3 and the bottom support beam 10-21 of the filler 10-2. The water spray pipes 1-3 of each group of antifreeze pipe assemblies 1 are in an arc shape of one eighth. The main water tank 10-1 of the natural ventilation cooling tower 10 is arranged in a cross shape, and the plane where it is located is divided into 4 quadrants. Every 2 groups of antifreeze pipe assemblies 1 are arranged in the same quadrant in an axisymmetric manner.

[0049] See Figure 2 , Figure 4 and Figure 7 , valve 1-1 is made of stainless steel. Valve 1-1 is fixedly arranged on the side wall of the corresponding side of the end of the main water tank 10-1 (i.e., the end close to the tower wall) through the gate valve frame 1-11. The water inlet of valve 1-1 is sealed and connected with the main water tank 10-1. The valve connecting pipe 1-2 is made of Q235 steel. One end of the water inlet of the valve connecting pipe 1-2 is sealed and connected with the water outlet of valve 1-1, and the water outlet at the other end passes downward through the packing 10-2 and the bottom support beam 10-21 of the cooling tower, and the water outlet is arranged radially outwardly along the cooling tower. Valve 1-1 adopts a high-position door rod and a manually operated hand wheel to control its switch.

[0050] See Figure 3 , Figure 4 and Figures 8 to 13 The water spray pipe 1-3 includes a head end water spray pipe 1-31, an intermediate water spray pipe 1-32 and a terminal water spray pipe 1-33. There are a number of intermediate water spray pipes 1-32, and in this embodiment, there are 13 of them, and the central angle α corresponding to each intermediate water spray pipe 1-32 is 3 degrees. The head end water spray pipe 1-31, the 13 intermediate water spray pipes 1-32 and the terminal water spray pipe 1-33 are connected end to end in a socket-and-spigot type and fixedly connected in an arc shape, and are fixedly connected to each other by flanges and sealed to form a water spray pipe 1-3.

[0051] The first end water spray pipe 1-31, the middle water spray pipe 1-32 and the end water spray pipe 1-33 are all made of fiber-wound glass fiber reinforced plastic pipes. The first end water spray pipe 1-31, the middle water spray pipe 1-32 and the end water spray pipe 1-33 are all fixed to the corresponding support beam 10-21 below the inner filler 10-2 of the tower wall by stainless steel belts. In this embodiment, one stainless steel belt is fixed every 2 meters.

[0052] The head end water spray pipe 1-31 is T-shaped, and the middle water inlet of the head end water spray pipe 1-31 is sealed and connected with the lower water outlet of the valve connecting pipe 1-2. One end of the head end water spray pipe 1-31 close to the main water tank 10-1 connected to the valve 1-1 is sealed and closed by the corresponding head end stuffing plate 1-31-1, and the other end of the head end water spray pipe 1-31 away from the main water tank 10-1 connected to the valve 1-1 is fixedly connected to a corresponding middle water spray pipe 1-32 through a flange and sealed and connected. The head end water spray pipe 1-31 is provided with a plurality of head end water spray ports 1-31-2 with openings facing inward and downward. The angle β between the head end water spray port 1-31-2 and the vertical direction is 0 degrees to 45 degrees, and is 20 degrees in this embodiment. The cross-sectional shape of the head end water spray port 1-31-2 is rectangular, and the cross section is trapezoidal, that is, the head end water spray port 1-31-2 is in the shape of a quadrangular pyramid. The spacing between each head end water spraying port 1-31-2 is 100 to 300 mm, and in this embodiment is 200 mm.

[0053] The intermediate water spray pipe 1-32 is provided with a plurality of intermediate water spray ports 1-32-1 with openings facing inward and downward. The angle γ between the intermediate water spray ports 1-32-1 and the vertical direction is 0 to 45 degrees, and is 20 degrees in this embodiment. The cross-sectional shape of the intermediate water spray ports 1-32-1 is rectangular, and the cross-section is trapezoidal, that is, the intermediate water spray ports 1-32-1 are in the shape of a quadrangular pyramid. The spacing between the intermediate water spray ports 1-32-1 is the same as the spacing between the head end water spray ports 1-31-2, and the distance between the intermediate water spray ports 1-32-1 on the adjacent intermediate water spray pipes 1-32 and the head end water spray ports 1-31-2 on the head end water spray pipe 1-31 is equal to the spacing between the head end water spray ports 1-31-2.

[0054] The end of the terminal water spray pipe 1-33 away from the main water tank 10-1 connected to the valve 1-1 is sealed and closed by a corresponding terminal baffle 1-33-1. The terminal water spray pipe 1-33 is provided with a plurality of terminal water spray ports 1-33-2 with openings facing inward and downward. The angle δ between the terminal water spray ports 1-33-2 and the vertical direction is 0 to 45 degrees, and is 20 degrees in this embodiment. The cross-sectional shape of the terminal water spray ports 1-33-2 is rectangular, and the cross-section is trapezoidal, that is, the terminal water spray ports 1-33-2 are in the shape of a quadrangular pyramid. The spacing between each terminal water spray port 1-33-2 is the same as the spacing between the head water spray ports 1-31-2, and the distance between the terminal water spray ports 1-33-2 on the adjacent terminal water spray pipe 1-33 and the intermediate water spray ports 1-32-1 on the intermediate water spray pipe 1-32 is equal to the spacing between the head water spray ports 1-31-2.

[0055] There are a plurality of water baffles 2, each of which is connected end to end and arranged around the outer periphery of the filler 10-2 to separate the filler 10-2 from the tower wall. Each water baffle 2 is fixedly arranged between the tower wall and the bottom support beam 10-21, and the angle between the water baffle 2 and the vertical direction is 0 to 8 degrees, and 4 degrees in this embodiment. The lower end of the water baffle 2 is located on the inner side of the water spray pipe 1-3 in the radial direction.

[0056] When the antifreeze system of the natural ventilation cooling tower of the present invention is used, the inner water supply is first closed, and the inner water supply is cut off. The hot water source of the water spray pipe 1-3 comes from the main water tank 10-1 when the water supply method in winter adopts the outer water supply. Each outer main water tank 10-1 supplies one eighth of the hot water of the water spray pipe 1-3 of the two adjacent quadrants, that is, each outer main water tank 10-1 supplies a total of one quarter of the hot water of the water spray pipe 1-3. The valve 1-1 of each group of antifreeze pipe assembly 1 is opened, and the water flow sprayed from each water spray port of the water spray pipe 1-3 is in a radial form, and the water flow crosses between the adjacent water spray ports, forming a hot water curtain as a whole, blocking the cold air from entering the tower from the air inlet 10-4 of the natural ventilation cooling tower 10, thereby preventing ice from forming. The water retaining plate 2 can effectively prevent water from flowing to the tower wall, preventing water from flowing down along the tower wall and causing ice, and further improving the safety of use.

[0057] The water spray pipeline 1-3 of the present invention is arranged in a circle and divided into 8 sections. One end of each water spray pipeline 1-3 is connected to the valve 1-1, and the other end is sealed with an end baffle 1-33-1. The flange is bolted and closed during operation. When sewage needs to be discharged, the valve 1-1 is closed, the water source is cut off, and the end baffle 1-33-1 at the other end is opened. All water spray outlets are dredged by tools, and then the valve 1-1 is opened. The dirt in the water spray pipeline 1-3 is flushed with water in the main water tank 10-1. After flushing, the valve 1-1 is closed again, and the end baffle 1-33-1 at the other end is installed and sealed.

[0058] (Example 2)

[0059] See Fig.14 The rest of this embodiment is the same as that of embodiment 1, except that one end of the water inlet of the valve connecting pipe 1-2 is sealed and connected to the water outlet of the valve 1-1, and the water outlet at the other end passes downward through the packing 10-2 of the cooling tower, passes through the water baffle 2 radially outward along the tower body, and is then arranged downward, and the middle water inlet of the head end spray pipe 1-31 is arranged upward and sealed and connected to the water outlet of the valve connecting pipe 1-2.

[0060] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An antifreeze system for a natural ventilation cooling tower, characterized in that: It comprises an antifreeze pipe assembly and a water baffle; the water spray pipe of the antifreeze pipe assembly is arranged in a circle on the inner side of the lower edge of the tower wall above the herringbone column of the air inlet of the natural ventilation cooling tower, near the tower wall corbel and below the bottom support beam of the filler; the water spray pipe is provided with a plurality of water spray ports facing inward and downward; there are a plurality of water baffles, each of which is connected end to end in sequence and arranged around the outer circumference of the filler to separate the filler from the tower wall; each water baffle is fixedly arranged between the tower wall and the bottom support beam, the angle between the water baffle and the vertical direction is 0 to 8 degrees, and the lower end of the water baffle is located on the inner side of the water spray pipe in the radial direction; There are 8 groups of antifreeze pipe assemblies, each of which has the same structure and includes valves, valve connecting pipes and water spraying pipes; the water spraying pipes of the 8 groups of antifreeze pipe assemblies are arranged in a circle on the inner side of the lower edge of the tower wall above the herringbone column of the air inlet of the natural ventilation cooling tower, near the tower wall corbel and the bottom support beam of the filler, and the water spraying pipes of each group of antifreeze pipe assemblies are in the shape of one eighth of an arc; the main water tank of the natural ventilation cooling tower is arranged in a cross-shaped distribution, and the plane where it is located is divided into 4 quadrants, and every 2 groups of antifreeze pipe assemblies are arranged in the same quadrant in an axisymmetric manner; the valve is made of stainless steel material; the valve is fixedly arranged on the side wall on the corresponding side of the end of the main water tank through a gate valve frame; the water inlet of the valve is sealed and connected to the main water tank; one end of the water inlet of the valve connecting pipe is sealed and connected to the water outlet of the valve, and the water outlet at the other end passes downward through the filler and bottom support beam of the cooling tower, and the water outlet is arranged radially outward along the cooling tower and connected to the water spraying pipe; The valve adopts high-position gate rod and manual hand wheel to control its opening and closing; The water spray pipeline includes a head-end water spray pipe, an intermediate water spray pipe and a terminal water spray pipe; there are a plurality of intermediate water spray pipes, and the central angle α corresponding to each intermediate water spray pipe is 3 degrees; the head-end water spray pipe, the intermediate water spray pipe and the terminal water spray pipe are connected end to end in a socket-and-spigot type in sequence to form an arc shape, and are fixedly connected to each other by flanges and sealed to form a water spray pipeline; The first end spray pipe, the middle spray pipe and the end spray pipe are all made of fiber-wound glass fiber reinforced plastic pipes; the first end spray pipe, the middle spray pipe and the end spray pipe are all fixed to the corresponding support beams below the inner packing of the tower wall through stainless steel belts; The head end water spray pipe is T-shaped, and the middle water inlet of the head end water spray pipe is sealed and connected with the lower water outlet of the valve connecting pipe; one end of the head end water spray pipe close to the main water tank connected to the valve is sealed and closed by a corresponding head end blanking plate, and the other end of the head end water spray pipe away from the main water tank connected to the valve is fixedly connected to a corresponding middle water spray pipe through a flange and sealed and connected; the head end water spray pipe is provided with a plurality of head end water spray ports opening inward and downward; the angle β between the head end water spray port and the vertical direction is 0 degrees to 45 degrees, the cross-section shape of the head end water spray port is rectangular, and the cross section is trapezoidal; the spacing between each head end water spray port is 100 to 300 mm; The middle water spray pipe is provided with a plurality of middle water spray ports opening inwardly and downwardly; the included angle γ between the middle water spray ports and the vertical direction is 0 to 45 degrees, the cross-section of the middle water spray ports is rectangular, and the cross-section is trapezoidal; the spacing between the middle water spray ports is the same as the spacing between the head end water spray ports, and the distance between the middle water spray ports on the adjacent middle water spray pipes and the head end water spray ports on the head end water spray pipe is equal to the spacing between the head end water spray ports; The end of the terminal water spray pipe away from the main water tank connected to the valve is sealed with a corresponding terminal baffle; the terminal water spray pipe is provided with a plurality of terminal water spray outlets opening inward and downward; the angle δ between the terminal water spray outlet and the vertical direction is 0 to 45 degrees; the cross-sectional shape of the terminal water spray outlet is rectangular and the cross-section is trapezoidal; the spacing between each terminal water spray outlet is the same as the spacing between the head water spray outlets, and the distance between the terminal water spray outlets on adjacent terminal water spray pipes and the middle water spray outlets on the middle water spray pipe is equal to the spacing between the head water spray outlets.

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