Indirect air cooling tower flow guide device and air cooling tower

Abstract

The invention provides an indirect type air cooling tower flow guiding device and an air cooling tower, the indirect type air cooling tower flow guiding device comprises an outlet flow guiding device and a tower bottom flow guiding device, the outlet flow guiding device comprises a plurality of flow guiding plates, the multiple flow guiding plates are evenly arranged at the top of an outlet of a tower body along the circumference, and flow passing holes are formed in the flow guiding plates in a penetrating mode; the tower bottom guide device is arranged in the middle of the bottom of the tower body. The flow guide plate is arranged at the top of the outlet of the tower body, and the flow passing hole is formed in the flow guide plate, so that crosswind can be guided, and strong crosswind interference can be reduced. The tower bottom flow guide device is arranged in the middle of the tower bottom to form resistance to transverse wind, so that the wind speed distribution on the outer surface of the heat exchanger finned tube bundle is more uniform. Through the synergistic effect of the outlet flow guide device and the tower bottom flow guide device, damage of crosswind to an aerodynamic field in the tower is reduced, and the problems of uneven heat exchange and low efficiency are avoided, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of cooling equipment, and specifically relates to a flow guide device for an indirect air cooling tower and an air cooling tower. Background Art

[0002] Indirect air-cooling towers are crucial equipment for coal-fired power units. Their operating conditions directly impact the overall thermal efficiency and operational stability of thermal power plants, but they are susceptible to crosswinds. Crosswinds can alter the direction of natural convection airflow within the tower, leading to uneven airflow distribution between the inlet and outlet. This can create localized vortices or short circuits, reducing overall ventilation efficiency. Crosswinds can also cause uneven wind speed distribution on the outer surface of the heat exchanger's finned tube bundles. Excessive wind speeds in some areas can exacerbate tube bundle vibration, while low wind speeds in others can reduce heat exchange efficiency. Furthermore, because indirect air-cooling towers are inherently sensitive to environmental factors such as wind speed, crosswinds can disrupt airflow within the tower, leading to localized high temperatures or uneven pressure, further exacerbating fluctuations in heat dissipation performance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a flow guide device for an indirect air cooling tower and an air cooling tower, which can reduce the influence of crosswind and improve the cooling effect.

[0004] In order to solve the above problems, the first aspect of the present application provides a flow guide device for an indirect air-cooling tower, including an outlet flow guide device and a tower bottom flow guide device, the outlet flow guide device includes a plurality of guide plates, and the plurality of guide plates are evenly arranged along the circumference at the top of the outlet of the tower body of the indirect air-cooling tower, and flow holes are penetrated on the guide plates, and the tower bottom flow guide device is arranged in the middle of the bottom of the tower body.

[0005] Optionally, the plurality of guide plates are arranged circumferentially and axially along the outlet; in the circumferential direction of the outlet, the total flow area of the flow holes on the plurality of guide plates is the same; and in the axial direction from bottom to top along the outlet, the total flow area of the flow holes on the plurality of guide plates increases.

[0006] Optionally, the outlet guide device includes a plurality of fixed columns, which are vertically arranged on the top of the tower body. The guide plate is rotatably connected to the fixed columns, and the angle between the guide plate and the fixed columns is adjustable.

[0007] Optionally, the outlet guide device includes a telescopic rod, one end of the telescopic rod is hinged to the fixed column, and the other end is hinged to the guide plate, and the bottom of the guide plate is hinged to the fixed column.

[0008] Optionally, the tower bottom flow guide device includes multiple heat exchange plates, and the multiple heat exchange plates are divided into two groups. The heat exchange plates in each group are arranged along a straight line, the arrangement directions of the two groups of heat exchange plates are set at an angle, and the intersection of the two groups of heat exchange plates is located at the bottom center of the tower body.

[0009] Optionally, the arrangement directions of the two groups of heat exchange plates are perpendicular to each other.

[0010] Optionally, in the vertical direction, at least one heat exchange plate is provided in the tower bottom flow guide device, and in the vertical direction, the total height of the heat exchange plate is the same as the height of the air inlet of the tower body.

[0011] Optionally, the guide plates on the same horizontal circumference are identical.

[0012] In a second aspect of the present application, an air-cooling tower is provided, comprising the flow guiding device of the indirect air-cooling tower as described above.

[0013] Optionally, the air cooling tower further includes a guide wall or louvers arranged on the outer peripheral side of the tower body, and the external air flow flows through the guide wall or the louvers and enters the indirect air cooling tower; the height of the guide wall or the louvers is not lower than the height of the air inlet of the tower body.

[0014] Beneficial effects

[0015] The embodiments of the present invention provide a flow guide device and an air cooling tower for an indirect air cooling tower. By arranging a flow guide plate at the top of the outlet of the tower body and opening a flow hole on the flow guide plate, the crosswind can be guided, which can reduce the interference of strong crosswinds and the change of direction of the airflow in the tower caused by the crosswind, thereby reducing the uneven distribution of airflow between the air inlet and the air outlet, local vortex or short circuit phenomenon, and improving the overall ventilation efficiency. By arranging a tower bottom flow guide device in the middle of the bottom of the tower, resistance is formed to the crosswind, so that the wind speed distribution on the outer surface of the heat exchanger fin tube bundle is more uniform, avoiding the situation where the local wind speed is too high to cause the tube bundle to vibrate, and too low to reduce the heat exchange efficiency. Through the synergistic effect of the outlet flow guide device and the tower bottom flow guide device, the damage to the aerodynamic field in the tower by the crosswind is reduced, and the problems of reduced efficiency and uneven heat exchange are avoided, thereby improving the heat exchange efficiency. Effectively improving the heat exchange effect under crosswind conditions can directly reduce the operating back pressure of the unit turbine, thereby improving the overall thermal efficiency of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic cross-sectional view of an indirect air cooling tower according to an embodiment of the present application;

[0017] Figure 2 A schematic side view of an outlet flow guide device according to an embodiment of the present application;

[0018] Figure 3This is a schematic rear view of the outlet guide device according to an embodiment of the present application;

[0019] Figure 4 This is a schematic top view of an indirect air cooling tower according to an embodiment of the present application.

[0020] The reference numerals indicate:

[0021] 1. Tower body; 2. Outlet guide device; 21. Guide plate; 211. Flow hole; 22. Fixed column; 23. Telescopic rod; 3. Tower bottom guide device; 31. Heat exchange plate. DETAILED DESCRIPTION

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] See also Figures 1 to 4As shown, according to the first aspect of the embodiment of the present application, a flow guide device for an indirect air-cooling tower is provided, including an outlet flow guide device 2 and a tower bottom flow guide device 3. The outlet flow guide device 2 includes a plurality of guide plates 21, and the plurality of guide plates 21 are evenly arranged along the circumference at the top of the outlet of the tower body 1 of the indirect air-cooling tower. The guide plates 21 are penetrated by flow holes 211, and the tower bottom flow guide device 3 is arranged in the middle of the bottom of the tower body 1.

[0027] By setting a guide plate 21 at the top of the outlet of the tower body 1 and opening a flow hole 211 on the guide plate 21, the cross wind can be guided, which can reduce the interference of strong cross wind and reduce the direction change of the air flow in the tower caused by the cross wind, thereby reducing the uneven distribution of air flow between the air inlet and outlet, local vortex or short circuit phenomenon, and improving the overall ventilation efficiency.

[0028] By setting a tower bottom guide device 3 in the middle of the tower bottom, resistance is formed to the lateral wind, so that the wind speed distribution on the outer surface of the heat exchanger fin tube bundle is more uniform, avoiding the situation where the local wind speed is too high causing the tube bundle to vibrate, and too low to reduce the heat exchange efficiency.

[0029] The synergistic effect of the outlet flow guide 2 and the tower bottom flow guide 3 reduces crosswind damage to the aerodynamic field within the tower, avoiding efficiency reduction and uneven heat exchange, thereby improving heat exchange efficiency. Effectively improving heat exchange in crosswind conditions directly reduces the back pressure of the unit's steam turbine, thereby improving the unit's overall thermal efficiency.

[0030] The indirect air cooling tower is a roughly vertically arranged cylindrical structure, the outlet of the tower body 1 is located at the top of the indirect air cooling tower, and the outlet of the tower body 1 is located at the bottom of the indirect air cooling tower.

[0031] The top of the indirect air cooling tower has a certain thickness, and the guide plate 21 is arranged on the top surface of the top of the tower body 1.

[0032] Specifically, the outlet flow guiding device 2 is generally vertically arranged as a whole, and the bottom of the outlet flow guiding device 2 is fixed on the top surface of the tower body 1 .

[0033] The tower bottom flow guiding device 3 is arranged inside the tower body 1 and is located in the middle of the bottom surface of the tower body 1 .

[0034] Specifically, the center position of the tower bottom flow guiding device 3 is located in the middle of the bottom surface of the tower body 1.

[0035] The plurality of guide plates 21 are arranged circumferentially and axially along the outlet. The total flow area of the flow holes 211 on the plurality of guide plates 21 is the same circumferentially along the outlet. The total flow area of the flow holes 211 on the plurality of guide plates 21 increases from bottom to top along the outlet.

[0036] By increasing the total flow area of the flow holes 211 of the guide plate 21 from bottom to top along the outlet axis, a gradient reduction in crosswinds can be achieved. The flow area of the bottom guide plate 21 is small, providing initial resistance to strong crosswinds. The flow area at the top gradually increases, allowing the airflow to gradually transition to a natural flow state, avoiding turbulence caused by sudden pressure relief at the top, thereby targetedly reducing the impact of crosswinds at different height levels.

[0037] By making the total flow area of the flow holes 211 of each guide plate 21 the same in the circumferential direction, the ventilation resistance in the circumferential direction of the tower body 1 outlet is ensured to be consistent, and the air flow deflection caused by the difference in flow area in a certain direction is avoided. The cross wind is evenly regulated in the circumferential direction, and the air flow in the tower is prevented from forming local vortices due to uneven circumferential resistance, thereby ensuring the consistency of heat exchange conditions in all directions of the tower body 1.

[0038] By creating a gradual pressure gradient from bottom to top within the tower, the high-resistance area at the bottom slows down crosswind intrusion, while the low-resistance area at the top allows for smooth airflow. This effectively reduces pressure fluctuations within the tower caused by crosswinds, avoids localized high or low pressure areas that interfere with heat exchange efficiency, and improves heat dissipation stability.

[0039] The areas of the flow holes 211 on the same guide plate 21 are the same. The flow holes 211 of the guide plate 21 at a higher position are larger or more numerous, thereby achieving a good transition effect and eliminating the influence of strong crosswinds to the greatest extent.

[0040] The tower body 1 is roughly cylindrical, the outlet is circular, the circumferential direction of the outlet refers to the circumferential direction of the tower body 1 in the horizontal plane, and the axial direction of the outlet refers to the vertical direction.

[0041] The guide plate 21 is provided with at least one flow hole 211 . The total flow area of a guide plate 21 refers to the sum of the flow areas of all the flow holes 211 on the guide plate 21 .

[0042] Among them, the total flow area in the circumferential direction increases from bottom to top.

[0043] The guide plates 21 on the same horizontal circumference are identical, that is, the guide plates 21 on the same horizontal circumference have the same structure but are arranged in different directions. In other words, the number and arrangement positions of the flow holes of the guide plates 21 on the same horizontal circumference are the same.

[0044] The outlet guide device 2 includes a plurality of fixed columns 22, which are vertically arranged on the top of the tower body 1. The guide plate 21 is rotatably connected to the fixed columns 22, and the angle between the guide plate 21 and the fixed columns 22 is adjustable.

[0045] By making the outlet guide device 2 include multiple fixed columns 22 vertically arranged along the top of the tower body 1, the guide plate 21 is rotatably connected to the fixed columns 22 and the angle between the guide plate 21 and the fixed columns 22 is adjustable, the angle of the guide plate 21 can be dynamically adjusted according to the real-time wind speed.

[0046] Specifically, when facing different wind speeds, the angle of the guide plate 21 can be reduced in strong wind to increase wind resistance, while the angle can be increased in weak wind to ensure ventilation efficiency, thereby achieving directional guidance and graded weakening of crosswind.

[0047] Among them, dynamic adjustment can allow the crosswind to enter the tower smoothly after being diverted, reducing airflow turbulence and pressure fluctuations, avoiding vortexes or short circuits caused by uneven airflow at the inlet and outlet, and accurately controlling the pressure gradient in the tower so that the pressure changes gradually when the airflow rises, thereby improving the stability of the airflow in the tower, thereby optimizing the heat exchange efficiency, reducing the back pressure of the unit, and being able to adapt to complex wind conditions, thereby enhancing the reliability and energy-saving effect of the air-cooling tower operation.

[0048] The fixing columns 22 may be straight rod structures and arranged vertically. The fixing columns 22 may be connected to form a frame structure via transversely arranged connecting beams.

[0049] The fixing column 22 is designed to be as small as possible while ensuring strength, so as to reduce obstruction to crosswind.

[0050] The fixing column 22 is not opposite to the flow hole 211 on the guide plate 21 mounted thereon, so as to avoid blocking the cross wind from passing through the flow hole 211 .

[0051] The guide plate 21 can be rotatably mounted on one fixing post 22 , or can be rotatably mounted on at least two fixing posts 22 at the same time.

[0052] Specifically, such as Figure 3 As shown, a guide plate 21 is also provided on the fixing column 22 to ensure good connection strength.

[0053] The outlet guide device 2 includes a telescopic rod 23 , one end of the telescopic rod 23 is hinged to the fixed column 22 , and the other end is hinged to the guide plate 21 , and the bottom of the guide plate 21 is hinged to the fixed column 22 .

[0054] By hingedly connecting one end of the telescopic rod 23 to the fixed column 22 and the other end to the deflector 21, the deflector 21 can be driven to rotate around the hinge point at the bottom of the fixed column 22 by the extension and contraction of the telescopic rod 23, so as to adjust the angle of the deflector 21. When the crosswind intensity changes, the telescopic rod 23 can be extended and contracted to adjust the angle between the deflector 21 and the fixed column 22. When the wind is strong, the angle can be reduced to increase the wind resistance and weaken the wind force. When the wind is weak, the angle can be increased to ensure smooth ventilation.

[0055] Specifically, the telescopic rod 23 may be a hydraulic telescopic rod 23 or an electric telescopic rod 23 .

[0056] One end of the telescopic rod 23 is hinged to the fixed column 22 via a hinge axis. This hinge axis allows the telescopic rod 23 to rotate within a vertical plane to accommodate the displacement required when the angle of the deflector 21 changes. The other end of the telescopic rod 23 is hinged to the top or middle of the deflector 21 via a hinge axis. The hinge point must be positioned to ensure that the telescopic rod 23 can effectively drive the deflector 21 to rotate about its bottom hinge point when it is extended or retracted.

[0057] The bottom of the guide plate 21 is fixed to the fixed column 22 via a hinge shaft, forming a rotation fulcrum, thereby ensuring that the guide plate 21 can swing around the fulcrum within a certain angle range.

[0058] When the angle of the deflector 21 needs to be adjusted, the telescopic rod 23 is driven by a hydraulic or electric system to extend or retract. For example, if crosswinds increase from a certain direction, the control system instructs the telescopic rod 23 in the corresponding direction to retract, pulling the deflector 21 toward the fixed column 22, making the deflector 21 more vertical, reducing the angle between the deflector 21 and the fixed column 22, and increasing wind resistance to weaken the crosswind. If the crosswinds weaken, the telescopic rod 23 extends, pushing the deflector 21 toward the horizontal direction, making it more horizontal, reducing crosswind resistance and ensuring ventilation efficiency.

[0059] The tower bottom flow guide device 3 includes multiple heat exchange plates 31, which are divided into two groups. Each group of heat exchange plates 31 is arranged along a straight line. The arrangement directions of the two groups of heat exchange plates 31 are set at an angle, and the intersection of the two groups of heat exchange plates 31 is located at the bottom center of the tower body 1.

[0060] By arranging two groups of heat exchange plates 31 at a specific angle and crossing at the center of the bottom of the tower body 1, multi-directional resistance can be formed to the crosswind, and the bottom airflow can be guided upward to prevent the crosswind from passing through the hall. This can effectively alleviate the problem of airflow short-circuiting at the bottom of the tower caused by crosswind, and make the airflow flow evenly to the upper heat exchange area of the tower body 1, thereby improving the uniformity of wind speed on the surface of the fin tube bundle, reducing vibration caused by excessive local wind speed and reducing the heat exchange efficiency caused by excessively low wind speed.

[0061] The bottom of the tower body 1 is circular, and the intersection of the two groups of heat exchange plates 31 is located at the center of the circle of the bottom of the tower body 1 .

[0062] The two groups of heat exchange plates 31 are arranged in perpendicular directions, that is, the two groups of heat exchange plates 31 are arranged in a cross shape.

[0063] By setting the arrangement direction of the two groups of heat exchange plates 31 to be perpendicular to each other, the contact path between the airflow and the heat exchange surface can be increased, the heat exchange time can be prolonged, and the outlet guide device 2 can be used to form a guide system with upper and lower linkages, further optimizing the airflow distribution in the tower, reducing the back pressure of the unit and improving the overall thermal efficiency.

[0064] In the vertical direction, at least one heat exchange plate 31 is provided on the tower bottom flow guide device 3. In the vertical direction, the total height of the heat exchange plate 31 is the same as the height of the air inlet of the tower body 1.

[0065] By setting the total height of the heat exchange plate 31 to match the height of the air inlet, a full-height barrier is created along the critical path for crosswinds to enter the tower base. When crosswinds enter the tower body 1 through the air inlet, the heat exchange plate 31 creates resistance from the bottom to the top of the air inlet, preventing airflow from "circling" through the tower base from the bottom or top of the air inlet. This ensures that crosswinds are effectively directed upward rather than passing directly through the tower. This height-matched design precisely covers the airflow path of the air inlet, maximizing the blockage of short-circuit crosswinds and improving airflow diversion efficiency.

[0066] In the vertical direction, one or two heat exchange plates 31 are provided on the tower bottom flow guide device 3 .

[0067] In a second aspect of this embodiment, an air-cooling tower is provided, comprising the flow guiding device of the indirect air-cooling tower as described above.

[0068] The air cooling tower is an indirect air cooling tower.

[0069] The air cooling tower also includes a guide wall or louver arranged on the outer peripheral side of the tower body. The external airflow flows through the guide wall or louver and enters the indirect air cooling tower; the height of the guide wall or louver is not lower than the height of the air inlet of the tower body.

[0070] By setting up the guide wall or the louver, the guide wall or the louver serves as the first barrier outside the tower body 1, which can initially block and divert the incoming crosswind. When the crosswind hits the guide wall, the wall directly weakens the impact of the wind.

[0071] The guide wall or louver is arranged on the outer peripheral side of the indirect air cooling tower, surrounding the air inlet area at the bottom of the tower body 1 to form an outer barrier.

[0072] The height of the guide wall or louver is not lower than the height of the air inlet of the tower body, that is, the height of the guide wall or louver is usually consistent with or slightly higher than the height of the air inlet of the tower body 1, ensuring that the air inlet airflow path is fully covered.

[0073] The bottom of the guide wall can be fixed to the air cooling tower foundation through a concrete foundation or embedded parts, and the upper part of the wall is rigidly connected to the outer wall of the tower body 1 through connectors to ensure that the structure is stable and can withstand crosswind loads.

[0074] The shutters are mounted on a metal frame on the periphery of the air inlet of the tower body 1 , and the frame is fixed to the supporting structure at the bottom of the tower body 1 by bolts or welding.

[0075] Among them, the supporting structure strength of the tower body 1 can be increased or the tube bundle layout can be adjusted to improve the wind vibration resistance.

[0076] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0077] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A flow guide device for an indirect air cooling tower, characterized in that: The invention comprises an outlet flow guide device (2) and a tower bottom flow guide device (3), wherein the outlet flow guide device (2) comprises a plurality of flow guide plates (21), the plurality of flow guide plates (21) are evenly arranged along the circumference at the top of the outlet of the tower body (1) of the indirect air cooling tower, the flow guide plates (21) are penetrated by flow holes (211), and the tower bottom flow guide device (3) is arranged at the middle of the bottom of the tower body (1).

2. The flow guide device of the indirect air cooling tower according to claim 1, characterized in that: The plurality of guide plates (21) are arranged along the circumferential direction and the axial direction of the outlet; in the circumferential direction of the outlet, the total flow area of the flow holes (211) on the plurality of guide plates (21) is the same; and in the axial direction from bottom to top along the outlet, the total flow area of the flow holes (211) on the plurality of guide plates (21) increases.

3. The flow guide device of the indirect air cooling tower according to claim 1, characterized in that: The outlet flow guide device (2) comprises a plurality of fixed columns (22), the plurality of fixed columns (22) being vertically arranged on the top of the tower body (1), the flow guide plate (21) being rotatably connected to the fixed columns (22), and the angle formed between the flow guide plate (21) and the fixed columns (22) on which it is located being adjustable.

4. The flow guide device of the indirect air cooling tower according to claim 3, characterized in that: The outlet flow guide device (2) comprises a telescopic rod (23), one end of the telescopic rod (23) is hinged to the fixed column (22), and the other end is hinged to the flow guide plate (21), and the bottom of the flow guide plate (21) is hinged to the fixed column (22).

5. The flow guide device of the indirect air cooling tower according to claim 1, characterized in that: The tower bottom flow guide device (3) comprises a plurality of heat exchange plates (31), wherein the plurality of heat exchange plates (31) are divided into two groups, wherein the heat exchange plates (31) of each group are arranged along a straight line, the arrangement directions of the two groups of heat exchange plates (31) are arranged at an angle, and the intersection of the two groups of heat exchange plates (31) is located at the bottom center of the tower body (1).

6. The flow guide device for an indirect air cooling tower according to claim 5, characterized in that: The arrangement directions of the two groups of heat exchange plates (31) are perpendicular to each other.

7. The flow guide device for an indirect air cooling tower according to claim 5, characterized in that: In the vertical direction, at least one heat exchange plate (31) of the tower bottom flow guide device (3) is provided, and in the vertical direction, the total height of the heat exchange plate (31) is the same as the height of the air inlet of the tower body (1).

8. The flow guide device of the indirect air cooling tower according to claim 1, characterized in that: The guide plates (21) on the same horizontal circumference are identical.

9. An air cooling tower, characterized in that: A flow guide device comprising an indirect air cooling tower as described in any one of claims 1 to 8.

10. The air cooling tower according to claim 9, characterized in that The air cooling tower also includes a guide wall or louver arranged on the outer peripheral side of the tower body, and the external air flow flows through the guide wall or the louver and enters the indirect air cooling tower; the height of the guide wall or the louver is not lower than the height of the air inlet of the tower body.

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