Cooling tower with top flow field optimization wind control device

Abstract

The utility model discloses a cooling tower with a top flow field optimization air control device, which 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, and the main structure size of the air inlet height Hj, the outer edge arrangement height Ht1 and the inner edge arrangement height Ht2 is required to be 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] This utility model belongs to the field of cooling tower flow field optimization technology, specifically relating to a cooling tower with a top flow field optimization and air control device. Background Technology

[0002] Natural draft wet cooling towers and elevated towers are the most common types of cooling towers used in China. During operation, longitudinal vortices are easily formed near the packing area on the inner side of the upper edge of the air inlet, generating air vortices, which reduces airflow in this area, weakens the heat exchange efficiency of the packing in this area, and thus reduces the cooling performance of the cooling tower. In addition, the effect of ambient crosswinds makes the circumferential air intake of the tower extremely uneven, reducing the ventilation volume inside the tower, seriously affecting the heat exchange effect, and reducing the cooling efficiency of the cooling tower.

[0003] Chinese patent application No. 201710598062.0 discloses a cooling tower with a guide cap. By adding the guide cap, the vortex condition at the air inlet of the cooling tower is improved, which has a positive impact on the flow pattern at the air inlet position. In addition, adding the guide cap can increase the average wind speed at the packing location. The root of the guide cap is located immediately above the air inlet, adjacent to the tower cylinder, effectively rectifying the airflow field outside the air inlet. However, because the flow area of ​​the ambient air suddenly expands after passing through the air inlet, vortices are still generated above the air inlet, affecting the cooling tower's cooling performance.

[0004] Chinese patent application number 201120033074.7 discloses an integrated device for airflow guidance and antifreeze wind deflection in a counter-flow natural ventilation cooling tower. This device involves installing a certain number of integrated airflow guidance and antifreeze wind deflection devices around the circumference of the air inlet at the bottom of the cooling tower. The devices include a guide plate body and wind deflector blades movably connected thereon. The wind deflector blades and the guide plate body are integrated to control and optimize the uniformity of the airflow field and the amount of air entering the tower. In winter, the rotating wind deflector blades prevent the cooling tower from freezing, replacing the traditional wind deflector. While this device can effectively control the air intake, it only optimizes the flow field around the tower and cannot optimize the vortices generated inside the tower. The main body of the guide plate is rhomboid, with an acute angle ranging from 75 to 80 degrees, a height equal to the height of the air inlet, and an installation distance of 0 to 500 mm from the plane of the air inlet. From this, it can be deduced that the side length of the guide plate is the ratio of the height of the air inlet to the sine of the acute angle, which is greater than the height of the air inlet. For example, in the embodiment, the acute angle is 75 degrees, the air inlet height is 8100 mm, and the side length of the guide plate is 8385 mm. The excessive length of the guide plate will induce a large transverse vortex on its leeward side, increasing the air intake resistance. The wind deflector blades are rectangular, with a length of 1200 mm to 4000 mm. After the wind deflector blades rotate, they do not form a closed space, resulting in a reduced antifreeze effect. Cold air enters the tower directly from the upper side of the air inlet, causing greater icing hazards to the packing.

[0005] Chinese patent application No. 202311262931.4 discloses a cooling tower with an antifreeze device that can eliminate longitudinal vortices at the upper edge of the air inlet. By adding an antifreeze device with a roof, the inner end of the roof is installed on the outer side of the tower above the air inlet, and the vertical height H3 between the roof and the upper edge of the air inlet is 0.1 to 0.3 times the height H of the air inlet. The angle θ with the horizontal plane is 0° to 20°, and the radial outward and downward extension length L is 1.5m to H3 / sinθ. The roof enhances the heat and mass transfer in the packing area at the upper edge of the air inlet, ensuring cooling efficiency. However, the requirements for the dimensions of the roof are too large, which cannot meet the needs of various types and specifications of cooling towers. For example, the air inlet height of high-level towers is relatively high, around 15 meters or even higher. The relative limitation requirements are that the difference between the inner end height and the air inlet height should be 1.5m to 4.5m, and the length L should be 1.5m to 13m. Excessive length will affect the air flow field at the upper edge of the air inlet. Furthermore, there is no limit to the height of the outer end of the roof. If it is too low, it will reduce the air intake area, reduce the total air intake of the tower, and further reduce the cooling performance of the cooling tower.

[0006] Chinese patent application No. 202221988242.2 discloses a natural ventilation wet cooling tower with integrated vertical anti-freeze louvers for airflow guidance. The tower includes a natural ventilation wet cooling tower, a baffle plate, and vertical anti-freeze louvers. The baffle plate is located in the middle of adjacent louvers and is installed perpendicularly to them, improving the uniformity of airflow into the cooling tower. The vertical anti-freeze louvers can adjust their angle according to ambient temperature, airflow direction, and wind speed to change the airflow area, thereby regulating the airflow volume into the cooling tower. While the vertical louvers have some airflow guiding function, the main airflow guiding effect is achieved by the baffle plate. Summary of the Invention

[0007] To address the problems existing in the prior art, this utility model proposes a cooling tower with a top flow field optimization and air control device.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a cooling tower with a top flow field optimization and air control device, comprising a cooling tower and an air control device, characterized in that: the cooling tower includes a tower cylinder, an air inlet, and packing; the wall thickness at the lowest end of the tower cylinder is dt; the height of the air inlet is Hj; the height difference between the packing arrangement height and the upper edge of the air inlet is Hft; the air control device is an annular top plate inclinedly arranged above the air inlet, and its main structural dimensions include the outer edge arrangement height Ht1, the inner edge arrangement height Ht2, and the radial extension Lt; the outer edge arrangement height Ht1 of the air 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, by forming a wedge-shaped apex space above the air inlet and on the outer wall of the tower, the air coming from the outside of the cooling tower air inlet is split into the inlet airflow and the wedge-shaped apex space swirling flow through the lowest end wall of the tower, and the inlet airflow field structure is optimized by the wedge-shaped apex space swirling flow.

[0009] The tower is of hyperbolic shape, and the value of its lowest wall thickness dt is 0.5m ≤ dt ≤ 2m; the value of the air inlet height Hj is 3m ≤ Hj ≤ 30m; the value of the difference between the packing arrangement height and the upper edge of the air inlet height Hft is 0.3m ≤ Hft ≤ 5m.

[0010] The radial extension Lt is the distance between the top of the inner edge and the top of the outer edge of the air control device. The value of Lt is 2(dt+Hft)≤ Lt≤ 4(dt+Hft).

[0011] The angle between the air control device and the horizontal plane is the horizontal tilt angle θt. Once the outer edge arrangement height Ht1, the inner edge arrangement height Ht2, and the radial extension Lt are determined, the horizontal tilt angle θt can be directly determined by the formula sinθt=(Ht2-Ht1) / Lt.

[0012] The wedge-shaped apex space is composed of an air control device and the outer wall of the tower adjacent to the air inlet. It provides an air swirling space for the air to be diverted at the bottom of the tower and optimizes the air flow field at the air inlet below the cooling tower through the swirling of the wedge-shaped apex space.

[0013] The included angle at the top of the wedge-shaped apex space is the wedge apex angle θa, which depends on the horizontal included angle θt of the wind control device and the tilt angle θw of the outer wall at the bottom of the tower, i.e., the wedge apex angle θa = θw - θt.

[0014] Based on increasing the controllable air inlet area and optimizing the flow field above the air inlet in the air control device, a circumferential flow guide device may be further included. The circumferential flow guide device is vertically arranged directly below or to the outside of the air control device, and is arranged in N layers in the height direction, where N=2, 3, 4, 5. The I layer of the circumferential flow guide device consists of M flat plate flow guide structures arranged in a ring with a circumferential spacing of Kz, where I=1, ..., N. The main structural dimensions of the flat plate flow guide structure include height Hz, width Lz, and thickness rz.

[0015] The height of the flat-plate flow guide structure is Hz = Ht1 / N; the width Lz of the flat-plate flow guide structure is in the range of 0.5m ≤ Lz ≤ 1.6m. By designing the width of the flat-plate flow guide structure, the leeward vortex is minimized, thereby reducing the air intake resistance formed by the leeward vortex while guiding the air; the thickness rz of the flat-plate flow guide structure is in the range of 0.5mm ≤ rz ≤ 5mm; the circumferential spacing Kz of the flat-plate flow guide structure is the distance between the vertical rotation axes of two adjacent flat-plate flow guide structures in the circumferential direction, and its value range is 0.5m ≤ Kz ≤ 1.6m.

[0016] The vertical rotation axis is the center line of rotation of the flat plate-type flow guide structure around the vertical direction, located in the middle of the flat plate-type flow guide structure; the radial angle between the flat plate-type flow guide structure and the cooling tower is the rotation angle θz, and the value of θz is 0°≤ θz≤90°; when the width Lz of the flat plate-type flow guide structure is equal to the circumferential spacing Kz, the circumferential flow guide device can also have an anti-freezing function. When the rotation angle θz is 0°, the flat plate-type flow guide structure is arranged radially and plays the role of circumferential flow guide. When the rotation angle θz is 90°, the flat plate-type flow guide structure is arranged circumferentially and plays the role of anti-freezing.

[0017] The circumferential airflow guide device rotates around a vertical rotation axis. It adopts an N-layer integrated rotation method, rotating the entire structure from a radial arrangement corresponding to 0° to a circumferential arrangement corresponding to 90°, thereby sealing the air inlet and meeting the requirement of complete antifreeze. Alternatively, it adopts a layered rotation method, rotating the upper J layers from top to bottom from a radial arrangement corresponding to 0° to a circumferential arrangement corresponding to 90° according to the actual antifreeze requirements, where J=1, ..., N, thereby sealing the upper side of the air inlet and opening the lower side, reducing the air intake area, controlling the air intake volume, and achieving the function of rotating to control airflow and prevent freezing as needed.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The structural dimensions of the annular top plate of the air control device include the outer edge arrangement height Ht1, the inner edge arrangement height Ht2, and the radial extension dimension Lt, all of which are determined by the bottom wall thickness dt of the tower and the height difference Hft between the packing 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 apex space formed above the air inlet and on the outer wall of the tower, the air coming from the outside of the cooling tower air inlet is split into the inlet airflow and the wedge-shaped apex space swirling flow through the lowest end wall of the tower. The inlet airflow field structure is optimized by the wedge-shaped apex space swirling flow. At the same time, its outer edge is higher than the air inlet height Hj to increase the controllable air inlet area, increase the air inlet volume, and offset the adverse effects of the additional resistance generated by the air control device, thereby further improving the cooling performance of the cooling tower.

[0019] Based on increasing the controllable air intake area and optimizing the flow field above the air inlet in the air control device, a circumferential flow guide device can be further included, consisting of N layers. Its flat-plate flow guide structure is vertically arranged in a ring around the outside of the air inlet at a circumferential spacing Kz, optimizing the flow field around the tower and enhancing air intake efficiency. The width Lz is required to be 0.5m ≤ Lz ≤ 1.6m. By designing the width of the flat-plate flow guide structure, the leeward vortex is minimized, reducing the air intake resistance formed by the leeward vortex while guiding the air. When its width Lz is equal to the circumferential spacing Kz, the circumferential flow guide device also has an anti-freezing function. According to the anti-freezing requirements of the cooling tower, the N-layer structure rotates around a vertical rotation axis, using an integrated rotation or layered rotation method, rotating from the radial arrangement corresponding to 0° to the circumferential arrangement corresponding to 90°, completely or partially closing the air inlet, reducing the air intake or preventing air intake, thus achieving the purpose of rotational air control and anti-freezing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a cooling tower structure with a top flow field optimization and air control device.

[0021] Figure 2 This is a schematic diagram of the structural dimensions of the air control device.

[0022] Figure 3 This is a schematic diagram showing the structure and dimensions of an antifreeze device when the circumferential guide length and circumferential spacing are equal.

[0023] Figure 4 A schematic diagram of transverse vortices generated on the leeward side under different sizes of circumferential guide currents.

[0024] In the diagram: 1-Cooling tower; 2-Air control device; 3-Tower cylinder; 4-Filling; 5-Air inlet; 6-Circumferential airflow guide device; 7-Wedge-shaped apex space. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0026] like Figure 1 As shown, a cooling tower with a top flow field optimization and air control device includes a cooling tower 1 and an air control device 2. The cooling tower 1 includes a tower cylinder 3, an air inlet 5, and packing 4. The wall thickness at the lowest end of the tower cylinder 3 is dt. The height difference between the packing 4 and the upper edge of the air inlet 5 is Hft. The air control device 2 is an annular top plate inclined above the air inlet 5. Its main structural dimensions include an outer edge arrangement height Ht1, an inner edge arrangement height Ht2, and a radial extension Lt, wherein the radial extension Lt ≥ 2(dt + Hft). The air control device 2, through a wedge-shaped apex space 7 formed above the air inlet 5 and on the outer wall of the tower cylinder 3 at an angle of θa, splits the incoming air from the outside of the air inlet 5 of the cooling tower 1 into an incoming airflow and a swirling flow in the wedge-shaped apex space 7, and optimizes the airflow field structure of the incoming airflow through the swirling flow in the wedge-shaped apex space 7. It may further include a circumferential airflow guide device 6, which is a flat plate-type airflow guide structure vertically arranged below or to the outside of the air control device 2. Its main structural dimensions include height Hz, width Lz and thickness rz, and it is arranged on the outside of the tower circumferential air inlet 5 with a circumferential spacing Kz.

[0027] Example 1 A cooling tower with a top flow field optimization and air control device, wherein the width and circumferential spacing of the flat plate-type flow guide structure of the circumferential flow guide device are not equal.

[0028] like Figure 1 , Figure 2 As shown, a cooling tower with a top flow field optimization and air control device includes a cooling tower 1 and an air control device 2. The cooling tower 1 includes a tower cylinder 3, an air inlet 5, and packing 4. The air control device 2 is an annular top plate inclinedly arranged above the air inlet 5. Through the wedge-shaped apex space 7 formed above the air inlet 5 and outside the tower cylinder 3, the air coming from outside the air inlet 5 of the cooling tower 1 is split into the incoming airflow and the swirling flow in the wedge-shaped apex space 7 through the lowermost end wall of the tower cylinder 3. The swirling flow in the wedge-shaped apex space 7 optimizes the flow field structure of the incoming airflow.

[0029] Tower 3 is of hyperbolic shape; the wall thickness at the lowest end of tower 3 is dt=0.8m; the height of air inlet 5 is Hj=8.2m; the height difference between the packing 4 and the upper edge of air inlet 5 is Hft=0.87m.

[0030] The outer edge of the air control device 2 is arranged at a height of Ht1=8.95m, which is higher than the height of the air inlet, increasing the controllable air inlet area. The inner edge is arranged at a height of Ht2=9.85m, with a radial extension dimension of Lt=4m and a horizontal tilt angle of θt=13°.

[0031] The outer edge is arranged at a height 0.75m higher than the upper edge of the air inlet 5. The air inlet area is increased compared to the previous air inlet area, and the air volume is increased accordingly, which can completely offset the resistance effect added by the addition of the air control device.

[0032] The circumferential flow guide device 6 is arranged radially, perpendicular to the ground, and divided into two layers in the vertical direction, such as... Figure 4 As shown, to prevent large transverse vortices from forming 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, located below the outer side of the wind control device 2.

[0033] The width and circumferential spacing are not equal, and the flat-plate flow guiding structure has only a circumferential guiding effect. The flat-plate flow guiding structure is arranged in the radial direction to guide unfavorable wind directions such as side winds around the tower, increase air intake efficiency, and improve cooling performance.

[0034] Example 2 A cooling tower with a top flow field optimization and air control device, wherein the width of the circumferential flow guide device is equal to the circumferential spacing of the flat plate type flow guide structure.

[0035] like Figure 2 , 3 As shown, a cooling tower with a top flow field optimization and air control device includes a cooling tower 1 and an air control device 2. The cooling tower 1 includes a tower cylinder 3, an air inlet 5, and packing 4. The air control device 2 is an annular top plate inclinedly arranged above the air inlet 5. Through the wedge-shaped apex space 7 formed above the air inlet 5 and outside the tower cylinder 3, the air coming from outside the air inlet 5 of the cooling tower 1 is split into the incoming airflow and the swirling flow in the wedge-shaped apex space 7 through the lowermost end wall of the tower cylinder 3. The swirling flow in the wedge-shaped apex space 7 optimizes the flow field structure of the incoming airflow.

[0036] The tower 3 is of hyperbolic shape; the wall thickness at the bottom of the tower 3 is dt=0.85m; the height of the air inlet 5 is Hj=8.185m; the height difference between the packing 4 and the upper edge of the air inlet 5 is Hft=0.85m.

[0037] The outer edge of the air control device 2 has a height of Ht1=8.86m, which is higher than the air inlet height, increasing the controllable air inlet area. The inner edge has a height of Ht2=9.965m, a radial extension dimension of Lt=5.15m, and a horizontal tilt angle of θt=12°.

[0038] The outer edge is arranged at a height higher than the air inlet height, with a difference of 0.675m. Compared with the air inlet area at the outer edge, the air inlet is moved outward, the air inlet area increases, and the air volume increases, which completely offsets the adverse effects of the added resistance of the air control device.

[0039] The circumferential flow guide device 6 is arranged radially, perpendicular to the ground, and is divided into two layers, such as... Figure 4 As shown, to prevent large transverse vortices from forming on the leeward side, a width of Lz = 1.2m is selected, where L1 = L2 = Lz / 2 = 0.6m, height Hz = 4.43m, thickness rz = 2.5mm, and circumferential spacing Kz = Lz = 1.2m.

[0040] Its width is equal to the circumferential spacing, and the circumferential airflow guide device also has an anti-freezing function: 1) In the airflow guiding state, the flat plate airflow guide structure is arranged radially with a rotation angle θz=0°, guiding unfavorable wind directions such as side winds around the tower, increasing air intake efficiency and improving cooling performance; 2) In the anti-freezing state, depending on the ambient temperature, outlet water temperature, etc.: when complete anti-freezing is not required, the upper layer can be rotated to the radial arrangement corresponding to the rotation angle θz=0°, closing the upper air intake and only retaining the lower air intake; when complete anti-freezing is required, both layers are rotated as a whole to the circumferential arrangement corresponding to the rotation angle θz=90°, closing the air intake and meeting the anti-freezing requirements. Ultimately, the function and effect of controllable rotational airflow guiding and anti-freezing are achieved.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to encompass all variations falling within the meaning and scope of equivalents of the claims within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cooling tower with a top flow field optimization and air control device, comprising a cooling tower and an air control device, characterized in that: The cooling tower includes a tower cylinder, an air inlet, and packing. The wall thickness at the lowest end of the tower cylinder is dt. The height of the air inlet is Hj. The height difference between the packing arrangement height and the upper edge of the air inlet is Hft. The air control device is an annular top plate inclinedly arranged above the air inlet. Its main structural dimensions include the outer edge arrangement height Ht1, the inner edge arrangement height Ht2, and the radial extension Lt. The outer edge arrangement height Ht1 of the air 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 apex space formed above the air inlet and on the outer wall of the tower cylinder, the airflow from the outside of the cooling tower air inlet is split into the incoming airflow and the swirling flow in the wedge-shaped apex space through the lowest end wall of the tower cylinder. The flow field structure of the incoming airflow is optimized through the swirling flow in the wedge-shaped apex space.

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

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

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

5. A cooling tower with a top flow field optimization and air control device according to claim 4, characterized in that: The wedge-shaped apex space is composed of an air control device and the outer wall of the tower adjacent to the air inlet. It provides an air swirling space for the air to be diverted at the bottom of the tower and optimizes the air flow field at the air inlet below the cooling tower through the swirling of the wedge-shaped apex space.

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

7. A cooling tower with a top flow field optimization and air control device according to claim 1, characterized in that: Based on increasing the controllable air inlet area and optimizing the flow field above the air inlet in the air control device, a circumferential flow guide device may be further included. The circumferential flow guide device is vertically arranged directly below or to the outside of the air control device, and is arranged in N layers in the height direction, where N=2, 3, 4, 5. The I layer of the circumferential flow guide device consists of M flat plate flow guide structures arranged in a ring with a circumferential spacing of Kz, where I=1, ..., N. The main structural dimensions of the flat plate flow guide structure include height Hz, width Lz, and thickness rz.

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

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

10. A cooling tower with a top flow field optimization and air control device according to claim 9, characterized in that: The circumferential airflow guide device rotates around a vertical rotation axis. It adopts an N-layer integrated rotation method, rotating the entire structure from a radial arrangement corresponding to 0° to a circumferential arrangement corresponding to 90°, thereby sealing the air inlet and meeting the requirement of complete antifreeze. Alternatively, it adopts a layered rotation method, rotating the upper J layers from top to bottom from a radial arrangement corresponding to 0° to a circumferential arrangement corresponding to 90° according to the actual antifreeze requirements, where J=1, ..., N, thereby sealing the upper side of the air inlet and opening the lower side, reducing the air intake area, controlling the air intake volume, and achieving the function of rotating to control airflow and prevent freezing as needed.

Images