Cooling tower with internal air distribution

Abstract

The application discloses a cooling tower with an internal air distribution device, which comprises rotatable guide vanes, a wind blocking wall formed by the guide vanes, a guide vane rotating device, a supporting frame, a stepping motor and a transmission mechanism, and a wind speed measuring and control system, wherein an upwardly inclined guide plate is installed on the guide vane, and the rotating angle of the guide vane is controlled by the stepping motor and the transmission mechanism through the guide vane rotating device. A wind speed measuring device is installed at the bottom of a packing area of the cooling tower along the circumferential direction of the inner wall of the cooling tower. The wind speed of each area is determined according to the wind speed measuring device. When side wind is detected and a low-speed area of air is formed in the tower, the guide vanes are rotated through the control system, the stepping motor and the transmission mechanism, the opening and closing or partial opening and closing of the wind blocking wall are realized, the purpose of eliminating the draught and uniformly distributing the air flow field in the tower is achieved, and the cooling performance of the cooling tower is improved.

Description

Technical Field

[0001] This invention belongs to the field of cooling tower technology, and specifically relates to a cooling tower with an internal air distribution device. The air distribution device is used to uniformly distribute the air flow field inside the cooling tower and enhance its cooling effect. Background Technology

[0002] Cooling towers, as a type of hybrid heat exchanger that relies on direct contact between cold and hot fluids for heat exchange, are widely used in industries such as central air conditioning, power generation, steel, and chemicals due to their simple structure, large heat exchange area, and good heat exchange effect. For example, in the power generation industry, during the thermodynamic cycle of steam, the exhaust steam releases a large amount of heat through the condenser. This heat is carried into the cooling tower by circulating water and dissipates to the air in the cooling tower. The cooled circulating water then returns to the condenser to continue absorbing the heat released by the exhaust steam, thus forming a cooling water circulation system.

[0003] Cooling towers typically utilize ambient air to cool circulating cooling water. The distribution of air within the tower significantly impacts heat dissipation, and a well-designed air velocity field distribution is crucial for maximizing cooling capacity. For naturally ventilated cooling towers, cold air typically enters through the air inlet at the bottom, while the circulating water to be cooled is sprayed down from the top. Through the water distribution system, spraying devices, and packing, the water mixes and exchanges heat with the upward-flowing air in the form of droplets or liquid films. Ideally, in a windless environment, the air velocity field within the tower is symmetrical. However, when crosswinds are present, especially at high speeds, a "through wind" forms at the bottom of the tower. This creates a low-velocity air zone on the windward side of the tower, reducing the airflow into this zone and thus decreasing the heat and mass transfer intensity between the air and cooling water, ultimately weakening the cooling effect. Existing technologies employ the placement of guide vanes on the outside of the cooling tower, such as patent CN110057204A, to guide crosswinds into the cooling tower. However, since these guide vanes are located on the periphery of the cooling tower, they occupy a large area, making them difficult to implement in scenarios where the area around the cooling tower is limited. Furthermore, when there is crosswind and its instantaneous velocity varies greatly, the angles of the multiple guide vanes are difficult to coordinate, affecting the guiding effect. More importantly, these peripheral guide vanes can only guide crosswinds into the tower, and have limited effect on the uniform distribution of airflow within the tower, especially in the upper space. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a cooling tower with an internal air distribution device. This device guides and appropriately blocks the incoming cold air in the cooling tower when there is crosswind, thereby eliminating or weakening the effect of "through wind" and avoiding the occurrence of low wind speed zones inside the tower. At the same time, it can make the crosswind form an upward rotating airflow inside the tower, especially when the instantaneous velocity variation range of the crosswind is large, it can better uniformize the airflow field inside the tower, thereby improving the cooling capacity of the cooling tower.

[0005] To solve the above problems, the technical solution of the present invention is as follows:

[0006] This invention proposes a cooling tower with an internal air distribution device, including a guide wall and a wind speed measuring device. The guide wall is arranged radially around the cooling tower's axis, above the rain zone and water storage tank at the bottom of the cooling tower. The wind speed measuring device is located at the bottom of the cooling tower's packing area and is arranged along the circumference of the cooling tower's inner wall. The guide wall includes a support frame with several guide vanes mounted on it. Each guide vane has a guide plate. The guide vanes are driven by a drive device to rotate around their own centerline. The drive device is controlled by a control system, which controls the drive device based on data detected by the wind speed measuring device, thereby controlling the rotation angle of the guide vanes.

[0007] As a further technical solution, a rotating shaft is installed on the center line of the guide vane, and the guide vane and the rotating shaft are mounted on the support frame, so that the guide vane can rotate around the center line of the guide vane.

[0008] As a further technical solution, the guide plate is inclined upward along the surface of the guide blade to guide the crosswind to form an upward rotating flow along the guide plate.

[0009] As a further technical solution, the angle between the guide plate and the horizontal plane is 10 to 70 degrees.

[0010] As a further technical solution, the guide plate is a straight plate or an arc-shaped plate.

[0011] As a further technical solution, the rotation angle of the guide vanes is 0 to 90°. When the rotation angle of the guide vanes is 90°, the guide vanes form a completely open channel, restoring the traditional cooling tower working state without guide vanes. When the rotation angle of the guide vanes is less than 90°, gaps with corresponding angles are formed between adjacent guide vanes. After encountering the guide vanes, the cold air passes through the gaps and, under the guidance of the guide plates on the guide vanes, forms an upward rotating flow along the center direction of the cooling tower.

[0012] As a further technical solution, multiple wind speed measuring devices are provided, and the rotation angle of the guide vanes is based on the wind speed values ​​of each area measured by the wind speed measuring devices. The control system controls the guide vanes in different areas to rotate at the same or different angles based on the wind speed values.

[0013] As a further technical solution, the guide vane is a straight plate or an arc-shaped plate.

[0014] As a further technical solution, the guide wall is arranged symmetrically or asymmetrically with the tower axis as the reference.

[0015] As a further technical solution, the flow guide wall is provided in 4-8 units.

[0016] The beneficial effects of this invention are as follows:

[0017] By changing the rotation angle of the guide vanes and combining them with the guide plates on the guide vanes, the airflow field inside the tower can be altered, creating an upward rotating flow within the tower. This achieves a uniform airflow field inside the cooling tower, eliminates or reduces the "through draft" phenomenon, reduces the adverse effects of crosswinds, enhances the heat and mass transfer process between cold air and the cooled water, and improves the cooling performance of the cooling tower under unfavorable weather conditions. In particular, this invention allows crosswinds to form an upward rotating airflow within the tower. For reducing the impact of crosswinds, the arrangement of this invention is more effective than baffles installed on the outside of the cooling tower.

[0018] This invention is particularly suitable for improving the cooling performance of large cooling towers in the presence of strong crosswinds. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] Figure 1 This is a schematic diagram of a cooling tower with an internal air distribution system.

[0021] Figure 2 A schematic diagram of the structure of the guide vane and the guide plate installed on it.

[0022] In the diagram: 1. Support frame, 2. Guide vanes, 3. Stepper motor and transmission mechanism, 4. Control system, 5. Guide wall, 6. Wind speed measuring device, 7. Rotating shaft, 8. Guide plate, 9. Guide vane rotating device. Detailed Implementation

[0023] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] exist Figure 1 In the illustrated embodiment, a cooling tower with an internal air distribution device is disclosed, including a guide wall 5 arranged at the bottom of the cooling tower. The guide wall 5 is located above the rain zone and water storage tank at the bottom of the cooling tower, and is arranged radially with the cooling tower axis as the center point. See details below. Figure 1 Each guide wall 5 consists of several guide vanes 2 arranged sequentially and a support frame 1. Rotating shafts 7 are installed at the top and bottom of the guide vanes 2, and these shafts 7 are mounted on the support frame 1. By controlling the rotation of the rotating shafts 7, the guide vanes 2 can rotate along their centerline. Multiple guide vanes 2 on the same support frame 1 are connected to a stepper motor and a transmission mechanism 3 via a guide vane rotation device 9. The rotation of the stepper motor drives all the guide vanes 2 on the corresponding support frame 1 to rotate, thereby changing the arrangement angle of the guide vanes 2 to achieve uniform flow. The purpose of the airflow field inside the cooling tower is as follows: The rotation angle of the guide vane 2 is 0 to 90°. When the rotation angle of the guide vane 2 is 90°, the guide vane 2 forms a completely open channel, restoring the traditional cooling tower working state without the guide vane 2. When the rotation angle of the guide vane 2 is less than 90°, a gap with a corresponding angle is formed between adjacent guide vanes 2. After encountering the guide vane 2, the cold air passes through the gap and, under the guidance of the guide plate on the guide vane 2, forms an upward rotating flow along the center of the cooling tower; thereby achieving the purpose of enhancing air-water heat and mass transfer.

[0026] Multiple wind speed measuring devices 6 are installed at the bottom of the cooling tower packing area and along the circumference of the inner wall of the cooling tower. Each wind speed measuring device 6 detects the wind speed in a certain area. Based on the wind direction and wind speed in each area, the control system 4 and the stepper motor and transmission mechanism 3 control the guide vanes in the corresponding area to rotate at the same or different angles, thereby changing the air flow direction inside the tower and achieving the purpose of uniform air flow field inside the tower.

[0027] Furthermore, the aforementioned guide vanes can be either straight plates or curved plates, and the choice can be made; and the guide plates on the guide vanes can also be either straight plates or curved plates, and the choice can be made.

[0028] exist Figure 1 The guide wall 5, which consists of guide vanes, is arranged symmetrically with the tower axis as the reference. The four guide walls 5 are symmetrically set. Of course, it is not difficult to understand that the guide wall 5 can also be arranged in 4-8 pieces according to the weather conditions around the cooling tower and the operating conditions of the cooling tower. The guide wall 5 can be arranged symmetrically or asymmetrically.

[0029] Figure 2 The diagram shows the structure of the guide vane 2 and the guide plate 8 mounted on it. Figure 2 As shown, the guide vane 8 is installed on the guide blade 2 at an upward angle. The guide vane 2 and the guide vane 8 installed on it guide the air entering the tower, causing the crosswinds entering the cooling tower to form an upward rotating flow within the tower. This enhances the heat and mass transfer process between air and water within the tower. The wind speed measuring device 6, the control system 4, and the stepper motor and transmission mechanism 3 drive the guide vane 2 to rotate, realizing the opening and closing or partial opening and closing of the windbreak wall. This achieves the goal of uniform airflow within the tower and improving the cooling performance of the cooling tower.

[0030] Preferably, the angle between the guide plate and the horizontal plane is 10 to 70 degrees.

[0031] The internal air distribution device proposed in this invention drives the guide vanes to rotate through the control system, stepper motor and transmission mechanism, thereby opening and closing or partially opening and closing the windbreak wall, eliminating "through wind", uniformizing the air flow field inside the tower, and improving the cooling performance of the cooling tower.

[0032] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cooling tower with an internal air distribution device, characterized in that: The system includes a guide wall and an air velocity measuring device. The guide wall is located in the rain zone at the bottom of the cooling tower and above the water storage tank. The guide wall is arranged radially with the cooling tower axis as the center point. The air velocity measuring device is located at the bottom of the cooling tower packing area and is arranged along the circumference of the inner wall of the cooling tower. The guide wall includes a support frame, on which several guide blades are set. Each guide blade is equipped with a guide plate. The guide blades are driven by a drive device to rotate around their own vertical center line. The drive device is controlled by a control system. The control system controls the drive device based on the data detected by the air velocity measuring device, thereby controlling the rotation angle of the guide blades.

2. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: A rotating shaft is installed on the center line of the guide vane, and the guide vane is mounted on the support frame via the rotating shaft.

3. A cooling tower with an internal air distribution device as described in claim 2, characterized in that: The guide vane is inclined upward along the surface of the guide blades to guide the crosswind to form an upward rotating flow along the guide vane.

4. A cooling tower with an internal air distribution device as described in claim 3, characterized in that: The angle between the guide plate and the horizontal plane is 10~70°.

5. A cooling tower with an internal air distribution device as described in claim 3, characterized in that: The guide plate can be a straight plate or an arc-shaped plate.

6. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: The guide vanes rotate at an angle of 0 to 90°. When the guide vanes rotate at an angle of 90°, they form a completely open channel. When the guide vanes rotate at an angle of less than 90°, gaps with corresponding angles are formed between adjacent guide vanes. After encountering the guide vanes, the cold air passes through the gaps and, guided by the guide plates on the guide vanes, forms an upward rotating flow along the center of the cooling tower.

7. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: Multiple wind speed measuring devices are set up to measure the wind speed value of each area. The control system controls the guide vanes in different areas to rotate at the same angle according to the wind speed value.

8. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: The guide vanes are straight plates or curved plates.

9. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: The aforementioned guide walls are arranged symmetrically with the cooling tower axis as the reference.

10. A cooling tower with an internal air distribution device as described in claim 1, characterized in that: The aforementioned flow guide walls are provided in 4-8 units.

Images