Cooling tower with top flow field optimization wind control device

Abstract

The invention discloses a cooling tower with a top flow field optimization air control device, the cooling tower comprises a cooling tower and an air control device, the air control device is an annular top plate obliquely arranged on the upper side of an air inlet, the main structure size of the air inlet height Hj, the outer edge arrangement height Ht1 and the inner edge arrangement height Ht2, and the requirement is Ht2gt; ht1gt; and Hj, a wedge-shaped apex angle space is formed above the air inlet and on the outer wall of the tower barrel, so that inlet air is divided into tower inlet airflow and wedge-shaped apex angle space rotational flow, and the tower inlet airflow flow field structure is optimized through the wedge-shaped apex angle space rotational flow. The width of the circumferential flow guide device is Lz, the height of the circumferential flow guide device is Hz, the thickness of the circumferential flow guide device is rz, the circumferential flow guide device is vertically arranged on the outer side of the tower periphery air inlet at the circumferential interval of Kz, Lz is larger than or equal to 0.5 m and smaller than or equal to 1.6 m, and a tower periphery wind field is optimized; when the width Lz is equal to the circumferential distance Kz, the anti-freezing effect can be achieved at the same time, according to the anti-freezing requirement, integrated or layered rotation is adopted, the radial flow guide arrangement is rotated to the circumferential anti-freezing arrangement, and the rotary air control anti-freezing purpose is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling tower flow field optimization, and in particular relates to a cooling tower with a top flow field optimization wind control device. Background Art

[0002] Natural ventilation wet cooling towers, high-level towers, etc. are the most common cooling tower types currently used in China. During operation, longitudinal vortices are easily formed near the filler area on the inner side of the upper edge of the air inlet, generating air vortices, thereby reducing air circulation in this area and weakening the heat exchange efficiency of the filler in this area, thereby reducing the cooling performance of the cooling tower. In addition, the effect of environmental side winds makes the circumferential air intake of the tower extremely uneven, reducing the ventilation volume in the tower, seriously affecting the heat exchange effect, and reducing the cooling efficiency of the cooling tower.

[0003] The Chinese patent application, application number 201710598062.0, discloses a cooling tower with a guide cap. By adding a guide cap, the vortex condition at the air inlet of the cooling tower is improved, which has a positive impact on the flow state at the air inlet position; in addition, after adding the guide cap, the average wind speed at the filler position can be increased. The root of the guide cap is adjacent to the air inlet of the tower barrel and is arranged above the air inlet, which effectively rectifies the air flow field outside the air inlet. However, due to the sudden expansion of the flow area of ​​the ambient air through the air inlet tower, a vortex is still generated above the air inlet, affecting the cooling performance of the cooling tower.

[0004] A Chinese patent application, application number 201120033074.7, discloses an integrated device for inlet air guide and antifreeze windshield of a countercurrent natural ventilation cooling tower. A certain number of integrated devices for inlet air guide and antifreeze windshield are installed outside the circumference of the air inlet at the bottom of the cooling tower, including a guide plate body and windshield blades movably connected thereto; the windshield blades are integrated with the guide plate body to control and optimize the uniformity of the inlet air flow field and the amount of air entering the tower; in winter, the windshield blades are rotated to prevent the cooling tower from freezing, replacing the traditional windshield. Although the device can effectively control the air intake volume, it only optimizes the flow field around the tower and cannot optimize the vortex generated in the tower; the guide plate body is rhombus-shaped, the acute angle range is 75~80 degrees, the height is equal to the air inlet height, and the installation distance from the air inlet plane is 0~500mm. It can be concluded that the side length of the guide plate body is the ratio of the air inlet height to the sine of the acute angle, which is greater than the air inlet height. For example, the acute angle given in the embodiment is 75 degrees, the air inlet height is 8100mm, and the side length of the guide plate body is 8385mm. The guide plate body is too long, which will induce a larger lateral vortex on its leeward side and increase the air intake resistance; the windshield blade is rectangular with a length of 1200mm~4000mm. After the windshield blade rotates, no closed space is formed, resulting in a reduced antifreeze effect. Cold wind directly enters the tower from the upper side of the air inlet, which poses a greater icing hazard to the filler.

[0005] A Chinese patent application, application number 202311262931.4, discloses a cooling tower with an antifreeze device that can eliminate the longitudinal vortex at the upper edge of the air inlet in the tower. By adding an antifreeze device with a roof, the inner end of the roof is installed on the outside of the tower above the air inlet, and the vertical height H3 with the upper edge of the air inlet is 0.1~0.3 times the air inlet height H, the angle θ with the horizontal plane is 0°~20°, and the radial outward and downward extension length L is 1.5m~H3 / sinθ. The roof is used to enhance the heat and mass transfer in the filler area at the upper edge of the air inlet to ensure the cooling efficiency. However, the relevant size requirements of the ceiling are too large to meet the requirements of cooling towers of various types and specifications. For example, the air inlet height of a high-rise tower is relatively high, about 15 meters or even higher. The relative restriction requirement is that the difference between the inner end height and the air inlet height is 1.5m~4.5m, and the length L is 1.5m~13m. Too long a length will affect the air flow field at the upper edge of the air inlet. In addition, there is no limit on the height of the outer end of the ceiling. If it is too low, the air inlet area will be reduced, reducing the total air intake of the tower, further reducing the cooling performance of the cooling tower.

[0006] The Chinese patent application, application number 202221988242.2, discloses a natural ventilation wet cooling tower with integrated vertical antifreeze shutters, including a natural ventilation wet cooling tower, a guide plate and a vertical antifreeze shutter. The guide plate is located in the middle of the adjacent shutters and is installed vertically with the shutters to improve the uniformity of the air intake of the cooling tower; the vertical antifreeze shutters can adjust the shutter angle according to the ambient temperature, the wind direction and wind speed of the inlet wind to change the air intake area, thereby adjusting the air intake volume of the cooling tower. Although the vertical shutters have a certain diversion effect, the main diversion effect is achieved by the guide plate. Summary of the invention

[0007] In order to solve the above problems existing in the prior art, the present invention proposes a cooling tower with a top flow field optimization wind control device.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A cooling tower with a top flow field optimization wind control device, comprising a cooling tower and a wind control device, characterized in that: the cooling tower comprises a tower, an air inlet and a filler; the wall thickness of the lower end of the tower is dt; the height of the air inlet is Hj; the height difference between the filler arrangement height and the upper edge of the air inlet is Hft; the wind control device is an annular top plate arranged obliquely on the upper side of the air inlet, and its main structural dimensions include an outer edge arrangement height Ht1, an inner edge arrangement height Ht2 and a radial outward extension Lt; the outer edge arrangement height Ht1 of the wind control device is 0.1(dt+Hft)+Hj≤Ht1≤1.0(dt+Hft)+Hj, and the inner edge arrangement height Ht2 is 0.8(dt+Hft)+Hj ≤ Ht2 ≤ 1.2(dt+Hft)+Hj, through the wedge-shaped top angle space formed above the air inlet and on the outer wall of the tower, the air from the outside of the cooling tower air inlet is divided into the tower inlet airflow and the wedge-shaped top angle space swirl through the lower end wall of the tower, and the wedge-shaped top angle space swirl is used to optimize the flow field structure of the tower inlet airflow.

[0010] The tower is of hyperbolic type, and the value range of the wall thickness dt at its lower end is 0.5m≤ dt ≤ 2m; the value range of the air inlet height Hj is 3m≤ Hj ≤30m; the value range of the height difference Hft between the filler arrangement height and the upper edge of the air inlet is 0.3m≤ Hft ≤ 5m.

[0011] The radial outward extension Lt is the distance between the top of the inner edge and the top of the outer edge of the wind control device, and the value range of Lt is 2(dt+Hft)≤ Lt ≤ 4(dt+Hft).

[0012] The angle between the wind control device and the horizontal plane is the horizontal inclination angle θt. When the outer edge arrangement height Ht1, the inner edge arrangement height Ht2 and the radial outward extension Lt are determined, the horizontal inclination angle θt can be directly determined by the formula sinθt=(Ht2-Ht1) / Lt.

[0013] The wedge-shaped top angle space is composed of a wind control device and a portion of the tower outer wall adjacent to the air inlet, providing an air swirl space for the diversion of the tower's lower end wall, and optimizing the air flow field at the air inlet below the cooling tower through the swirl in the wedge-shaped top angle space.

[0014] The top angle of the wedge-shaped vertex angle space is the wedge-shaped vertex angle θa, which depends on the horizontal angle θt of the wind control device and the inclination angle θw of the outer wall at the lower end of the tower, that is, the wedge-shaped vertex angle θa=θw-θt.

[0015] On the basis that the wind control device increases the controllable air inlet area and optimizes the flow field above the air inlet, it can further include a circumferential guide device, which is vertically arranged directly below or below the outer side of the wind control device, and is divided into N layers in the height direction, N=2, 3, 4, 5; the Ith layer (I=1, ..., N) of the circumferential guide device is composed of M flat-plate guide structures arranged in a ring with a circumferential spacing Kz, and the main structural dimensions of the flat-plate guide structure include height Hz, width Lz and thickness rz.

[0016] The height Hz of the flat-plate guide structure is Ht1 / N; the width Lz of the flat-plate guide structure is in the range of 0.5m≤Lz≤1.6m. The width of the flat-plate guide structure is designed to minimize the vortex on the leeward side, thereby reducing the wind resistance formed by the vortex on the leeward side while guiding the wind; the thickness rz of the flat-plate guide structure is in the range of 0.5mm≤rz≤5mm; the circumferential spacing Kz of the flat-plate guide structure is the distance between the vertical rotation axes of two circumferentially adjacent flat-plate guide structures, and is in the range of 0.5m≤Kz≤1.6m.

[0017] The vertical rotation axis is the center line of rotation of the flat-plate flow guide structure around the vertical direction, and is located in the middle position of the flat-plate flow guide structure; the radial angle between the flat-plate flow guide structure and the cooling tower is the rotation angle θz, and the value range of θz is 0°≤ θz≤90°; when the width Lz of the flat-plate flow guide structure is equal to the circumferential spacing Kz, the circumferential flow guide device can also have an anti-freezing function at the same time. When the rotation angle θz is 0°, the flat-plate flow guide structure is radially arranged, playing the role of circumferential flow guidance. When the rotation angle θz is 90°, the flat-plate flow guide structure is circumferentially arranged, playing the role of anti-freezing.

[0018] The circumferential flow guide device rotates around the vertical rotation axis, and adopts N-layer integrated rotation mode to rotate the whole from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, thereby closing the air inlet to meet the demand for complete antifreeze, or adopts a layered rotation mode, and according to the actual antifreeze demand, the upper J layers (J=1, ..., N) from top to bottom are rotated from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, thereby closing the upper side of the air inlet and opening the lower side, reducing the air inlet area, controlling the air inlet volume, and achieving the effect of on-demand rotation to control wind and antifreeze.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The structural dimensions of the annular top plate of the wind control device include the outer edge arrangement height Ht1, the inner edge arrangement height Ht2 and the radial extension dimension Lt, which are all determined by the wall thickness dt of the bottom end of the tower and the height difference Hft between the filler and the upper edge of the air inlet. The horizontal inclination angle θt is determined by the above three structural dimensions. Through the wedge-shaped top angle space formed above the air inlet and on the outer wall of the tower, the incoming wind from the outside of the air inlet of the cooling tower is divided into the tower inlet airflow and the wedge-shaped top angle space vortex through the lower end wall of the tower, and the flow field structure of the tower inlet airflow is optimized through the wedge-shaped top angle space vortex. At the same time, its outer edge is higher than the air inlet height Hj to increase the controllable area of ​​the air inlet, increase the air inlet volume, offset the adverse effects of the additional resistance generated by the wind control device, and further improve the cooling performance of the cooling tower.

[0021] On the basis that the wind control device increases the controllable air inlet area and optimizes the flow field at the upper part of the air inlet, it can further include a circumferential guide device divided into N upper and lower layers, and its flat-plate guide structure is vertically arranged around the tower tube at a circumferential spacing Kz on the outside of the air inlet, so as to optimize the flow field around the tower and enhance the air inlet efficiency. The width Lz is required to be 0.5m≤Lz≤1.6m. The design of the width of the flat-plate guide structure minimizes the leeward side vortex, thereby reducing the air inlet resistance formed by the leeward side vortex while guiding the wind; when its width Lz is equal to the circumferential spacing Kz, the circumferential guide device also has an anti-freezing effect. According to the anti-freezing requirements of the cooling tower, the N-layer structure is rotated around the vertical rotation axis, and an integrated rotation or layered rotation is adopted to rotate from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, so as to completely or partially close the air inlet, reduce the air intake or prevent air intake, and achieve the purpose of rotary wind control and anti-freezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the cooling tower structure with a top flow field optimization wind control device.

[0023] Figure 2 Schematic diagram of the structural dimensions of the wind control device.

[0024] Figure 3 It is a schematic diagram of the structure and dimensions of the antifreeze device that can be made when the circumferential guide length is equal to the circumferential spacing.

[0025] Figure 4 Schematic diagram of the transverse vortex generated on the leeward side under circumferential flow guidance of different sizes.

[0026] In the figure: 1-cooling tower; 2-wind control device; 3-tower; 4-filler; 5-air inlet; 6-circumferential flow guide device; 7-wedge-shaped top angle space. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a cooling tower with a top flow field optimization wind control device comprises a cooling tower 1 and a wind control device 2, characterized in that: the cooling tower 1 comprises a tower 3, an air inlet 5 and a filler 4; the wall thickness of the lower end of the tower 3 is dt; the height difference between the arrangement height of the filler 4 and the upper edge of the air inlet 5 is Hft; the wind control device 2 is an annular top plate arranged obliquely on the upper side of the air inlet 5, and its main structural dimensions include the outer edge arrangement height Ht1, the inner edge arrangement height Ht2 and the radial outward extension Lt, wherein the radial outward extension Lt ≥2(dt+Hft); the wind control device 2 uses a wedge-shaped top angle space 7 with an included angle of θa formed above the air inlet 5 and the outer wall of the tower 3 to make the air coming from the outside of the air inlet 5 of the cooling tower 1 be divided into an inlet airflow and a swirl in the wedge-shaped top angle space 7 through the lower end wall of the tower 3, and optimizes the flow field structure of the inlet airflow through the swirl in the wedge-shaped top angle space 7. The circumferential guide device 6 may further be a flat-plate guide structure vertically arranged directly below or below the outside of the wind control device 2, and its main structural dimensions include height Hz, width Lz and thickness rz, and is arranged outside the tower circumferential air inlet 5 with a circumferential spacing Kz.

[0029] Embodiment 1 A cooling tower with a top flow field optimization wind control device, wherein the width and circumferential spacing of the flat-plate flow guide structure of the circumferential flow guide device are different.

[0030] like Figure 1 , Figure 2 As shown, a cooling tower with a top flow field optimization wind control device comprises a cooling tower 1 and a wind control device 2, characterized in that: the cooling tower 1 comprises a tower 3, an air inlet 5 and a filler 4; the wind control device 2 is an annular top plate obliquely arranged on the upper side of the air inlet 5, and through the wedge-shaped top angle space 7 formed above the air inlet 5 and outside the tower 3, the wind outside the air inlet 5 of the cooling tower 1 is divided into an inlet airflow and a swirl in the wedge-shaped top angle space 7 through the lower end wall of the tower 3, and the swirl in the wedge-shaped top angle space 7 is used to optimize the flow field structure of the inlet airflow.

[0031] The tower 3 is of a hyperbolic type; the wall thickness of the lower end of the tower 3 is dt=0.8m; the height of the air inlet 5 is Hj=8.2m; the height difference between the arrangement height of the filler 4 and the upper edge of the air inlet 5 is Hft=0.87m.

[0032] The outer edge of the wind control device 2 is arranged at a height Ht1 = 8.95m, which is higher than the air inlet height to increase the controllable air inlet area. The inner edge is arranged at a height Ht2 = 9.85, the radial extension dimension Lt = 4m, and the horizontal inclination angle θt = 13°.

[0033] The outer edge is arranged at a height of 0.75 m higher than the upper edge height of the air inlet 5 , and the air inlet area is increased compared to the previous air inlet area, and the air intake volume is increased accordingly, which can completely offset the resistance added by the additional wind control device.

[0034] The circumferential guide device 6 is arranged radially, perpendicular to the ground, and is divided into two layers in the height direction, such as Figure 4 As shown, in order to prevent the appearance of a large transverse vortex on the leeward side, a width Lz=1.1m, a height Hz=4.475m, a thickness rz=2mm, and a circumferential spacing Kz=1.5m are selected, which is located at the outer side and lower side of the wind control device 2.

[0035] The width is not equal to the circumferential spacing, and it only has the function of circumferential flow guidance. The flat-plate flow guidance structures are arranged in the radial direction to guide unfavorable wind directions such as side wind around the tower, increase air intake efficiency, and improve cooling performance.

[0036] Embodiment 2 A cooling tower with a top flow field optimization wind control device, wherein the width of the flat-plate flow guide structure of the circumferential flow guide device is equal to the circumferential spacing.

[0037] like Figure 2 , 3 As shown, a cooling tower with a top flow field optimization wind control device comprises a cooling tower 1 and a wind control device 2, characterized in that: the cooling tower 1 comprises a tower 3, an air inlet 5 and a filler 4; the wind control device 2 is an annular top plate obliquely arranged on the upper side of the air inlet 5, and through the wedge-shaped top angle space 7 formed above the air inlet 5 and outside the tower 3, the wind outside the air inlet 5 of the cooling tower 1 is divided into an inlet airflow and a swirl in the wedge-shaped top angle space 7 through the lower end wall of the tower 3, and the swirl in the wedge-shaped top angle space 7 is used to optimize the flow field structure of the inlet airflow.

[0038] The tower 3 is of a hyperbolic type; the wall thickness of the lower end of the tower 3 is dt=0.85m; the height of the air inlet 5 is Hj=8.185m; the height difference between the arrangement height of the filler 4 and the upper edge of the air inlet 5 is Hft=0.85m.

[0039] The outer edge of the wind control device 2 is arranged at a height Ht1 = 8.86m, which is higher than the air inlet height to increase the controllable air inlet area. The inner edge is arranged at a height Ht2 = 9.965, the radial extension dimension Lt = 5.15m, and the horizontal inclination angle θt = 12°.

[0040] The outer edge layout height is higher than the air inlet height, with a difference of 0.675m. Compared with the air inlet area at the edge air inlet, the air inlet moves outward, the air inlet area increases, and the air inlet volume increases, which completely offsets the adverse effects of increasing the resistance attached by the wind control device.

[0041] The circumferential guide device 6 is arranged radially, perpendicular to the ground, and is divided into two layers, such as Figure 4 As shown, in order to prevent large transverse vortices from appearing on the leeward side, the width Lz=1.2m is selected, where L1=L2=Lz / 2=0.6m, the height Hz=4.43m, the thickness rz=2.5mm, and the circumferential spacing Kz=Lz=1.2m.

[0042] Its width is equal to the circumferential spacing, and the circumferential guide device also has the function of antifreeze: 1) In the guide state, the flat guide structure is arranged in the radial direction, with a rotation angle of θz=0°, to guide the unfavorable wind direction such as the side wind around the tower, increase the air intake efficiency, and improve the cooling performance; 2) In the antifreeze state, according to the ambient temperature, water outlet temperature, etc., when complete antifreeze is not required, the upper layer can be rotated to the radial arrangement corresponding to the rotation angle θz=0°, the upper air inlet is closed, and only the lower air inlet is retained; when complete antifreeze is required, the two layers are rotated as a whole to the circumferential arrangement corresponding to the rotation angle θz=90°, the air inlet is closed, and the antifreeze requirements are met. Finally, the function and role of controllable rotary guide antifreeze are realized.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary implementation cases, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the implementation cases should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cooling tower with a top flow field optimization wind control device, comprising a cooling tower and a wind control device, characterized in that: The cooling tower comprises a tower, an air inlet and a filler; the wall thickness at the lowest end of the tower is dt; the height of the air inlet is Hj; the height difference between the filler arrangement height and the upper edge of the air inlet is Hft; the wind control device is an annular top plate arranged obliquely on the upper side of the air inlet, and its main structural dimensions include an outer edge arrangement height Ht1, an inner edge arrangement height Ht2 and a radial outward extension Lt; the outer edge arrangement height Ht1 of the wind control device is 0.1(dt+Hft)+Hj≤Ht1≤1.0(dt+Hft)+Hj, and the inner edge arrangement height Ht2 is 0.8(dt+Hft)+Hj≤Ht2≤1.2(dt+Hft)+Hj, and the wedge-shaped top angle space is formed above the air inlet and on the outer wall of the tower, so that the wind from the outside of the air inlet of the cooling tower is divided into an inlet airflow and a wedge-shaped top angle space vortex through the lowest end wall of the tower, and the inlet airflow flow field structure is optimized through the wedge-shaped top angle space vortex.

2. A cooling tower with a top flow field optimization wind control device according to claim 1, characterized in that: The tower is in a hyperbolic form, and the value range of the wall thickness dt at the lower end thereof is 0.5m≤ dt ≤ 2m; the value range of the air inlet height Hj is 3m≤ Hj ≤ 32m; the value range of the height difference Hft between the filler arrangement height and the upper edge of the air inlet is 0.3m≤ Hft ≤ 4m.

3. A cooling tower with a top flow field optimization wind control device according to claim 1, characterized in that: The radial outward extension Lt is the distance between the top of the inner edge and the top of the outer edge of the wind control device, and the value range of Lt is 2(dt+Hft)≤Lt≤4(dt+Hft).

4. A cooling tower with a top flow field optimization wind control device according to claim 1, characterized in that: The angle between the wind control device and the horizontal plane is the horizontal inclination angle θt. When the outer edge arrangement height Ht1, the inner edge arrangement height Ht2 and the radial outward extension Lt are determined, the horizontal inclination angle θt can be directly determined by the formula sinθt=(Ht2-Ht1) / Lt.

5. A cooling tower with a top flow field optimization wind control device according to claim 4, characterized in that: The wedge-shaped top angle space is composed of a wind control device and a portion of the tower outer wall adjacent to the air inlet, providing an air swirl space for the diversion of the tower's lower end wall, and optimizing the air flow field at the air inlet below the cooling tower through the swirl in the wedge-shaped top angle space.

6. A cooling tower with a top flow field optimization wind control device according to claim 5, characterized in that: The top angle of the wedge-shaped vertex angle space is the wedge-shaped vertex angle θa, which depends on the horizontal angle θt of the wind control device and the inclination angle θw of the outer wall at the lower end of the tower, that is, the wedge-shaped vertex angle θa=θw-θt.

7. A cooling tower with a top flow field optimization wind control device according to claim 1, characterized in that: On the basis that the wind control device increases the controllable air inlet area and optimizes the flow field above the air inlet, it can further include a circumferential guide device, which is vertically arranged directly below or below the outer side of the wind control device, and is divided into N layers in the height direction, N=2, 3, 4, 5; the Ith layer (I=1, ..., N) of the circumferential guide device is composed of M flat-plate guide structures arranged in a ring with a circumferential spacing Kz, and the main structural dimensions of the flat-plate guide structure include height Hz, width Lz and thickness rz.

8. A cooling tower with a top flow field optimization wind control device according to claim 7, characterized in that: The height Hz of the flat-plate guide structure is Ht1 / N; the width Lz of the flat-plate guide structure is in the range of 0.5m≤ Lz ≤1.6m. The width of the flat-plate guide structure is designed to minimize the vortex on the leeward side, thereby reducing the wind resistance formed by the vortex on the leeward side while guiding the wind; the thickness rz of the flat-plate guide structure is in the range of 0.5mm≤ rz ≤5mm; the circumferential spacing Kz of the flat-plate guide structure is the distance between the vertical rotation axes of two circumferentially adjacent flat-plate guide structures, and is in the range of 0.5m≤ Kz ≤1.6m.

9. A cooling tower with a top flow field optimization wind control device according to claim 8, characterized in that: The vertical rotation axis is the center line of rotation of the flat-plate flow guide structure around the vertical direction, and is located in the middle position of the flat-plate flow guide structure; the radial angle between the flat-plate flow guide structure and the cooling tower is the rotation angle θz, and the value range of θz is 0°≤ θz ≤90°; when the width Lz of the flat-plate flow guide structure is equal to the circumferential spacing Kz, the circumferential flow guide device can also have an anti-freezing function at the same time. When the rotation angle θz is 0°, the flat-plate flow guide structure is radially arranged, playing the role of circumferential flow guidance. When the rotation angle θz is 90°, the flat-plate flow guide structure is circumferentially arranged, playing the role of anti-freezing.

10. A cooling tower with a top flow field optimization wind control device according to claim 9, characterized in that: The circumferential flow guide device rotates around the vertical rotation axis, and adopts N-layer integrated rotation mode to rotate the whole from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, thereby closing the air inlet to meet the demand for complete antifreeze, or adopts a layered rotation mode, and according to the actual antifreeze demand, the upper J layers (J=1, ..., N) from top to bottom are rotated from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, thereby closing the upper side of the air inlet and opening the lower side, reducing the air inlet area, controlling the air inlet volume, and achieving the effect of on-demand rotation to control wind and antifreeze.

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