A circular cooling tower

Abstract

The present application discloses a circular cooling tower, which relates to the technical field of cooling towers and includes a tower body. A main water supply pipe is arranged at the center of the tower body, and a first branch pipe group and a second branch pipe group are communicated with the main water supply pipe. A first cooling system and a second cooling system are further arranged inside the tower body. The first branch pipe group is arranged above the first cooling system, the second branch pipe group is arranged above the second cooling system, and the first cooling system is arranged above the second branch pipe group. A water receiving tray is arranged at the bottom of the tower body. Both the first cooling system and the second cooling system are communicated with the water receiving tray, and a water outlet pipe is communicated with the water receiving tray. The present application has the effect of improving the cooling efficiency of the cooling tower.

Description

Technical Field

[0001] This application relates to the technical field of cooling towers, and particularly to a circular cooling tower. Background Art

[0002] A cooling tower is a widely used thermal equipment, and its basic components are packing, air extraction equipment, exhaust equipment, water collecting basin, water supply system, and the outer enclosure structure of the tower body.

[0003] The working principle is that the circulating cooling water enters the cooling tower through the water supply system. The air extraction equipment sucks the cold and dry air in the surrounding environment into the cooling tower, and an exhaust equipment is arranged at the top of the cooling tower. The water temperature is reduced by the heat conduction between the circulating cooling water and the cold and dry air and the evaporation of the circulating cooling water to take away the latent heat of vaporization. The circulating cooling water passes through the packing, and the packing makes the circulating cooling water entering the cooling tower form fine water droplets or thin water films as much as possible to increase the contact area and contact time between water and air and improve the cooling efficiency of the cooling tower. After the circulating cooling water all passes through the packing in the cooling tower, it is discharged from the water outlet.

[0004] However, when the amount of circulating cooling water discharged into the cooling tower is large and the external temperature is high, due to the limited amount of air flowing into the cooling tower and the relatively thick thickness of the packing, the cooling efficiency of the cooling tower for the circulating cooling water is relatively low. Summary of the Invention

[0005] In order to improve the cooling efficiency of the cooling tower, this application provides a circular cooling tower.

[0006] This application provides a circular cooling tower, adopting the following technical solutions:

[0007] A circular cooling tower includes a tower body, a main water supply pipe is arranged at the center of the tower body, and a first branch pipe group and a second branch pipe group are communicated with the main water supply pipe;

[0008] A first cooling system and a second cooling system are further arranged inside the tower body. The first branch pipe group is arranged above the first cooling system, the second branch pipe group is arranged above the second cooling system, and the first cooling system is arranged above the second branch pipe group;

[0009] A water receiving tray is arranged at the bottom of the tower body. Both the first cooling system and the second cooling system are communicated with the water receiving tray, and a water outlet pipe is communicated with the water receiving tray.

[0010] By adopting the above technical solution, the circulating cooling water can enter the tower body from the main water supply pipe. The water in the main water supply pipe is respectively transported into the first branch pipe group and the second branch pipe group. The water in the first branch pipe group is cooled by the first cooling system, and the water in the second branch pipe group is cooled by the second cooling system. Finally, the cooled circulating cooling water is collected in the water receiving tray and discharged from the water outlet pipe, completing the cooling of the circulating cooling water.

[0011] Setting the first cooling system and the second cooling system can improve the cooling efficiency of the circulating cooling water. When the amount of circulating cooling water entering the cooling tower increases, the cooling effect of the circulating cooling water can still be good.

[0012] Optionally, an air duct is vertically arranged in the center of the tower body, and the main water supply pipe is located in the air duct;

[0013] The first cooling system includes a packing ring and an auxiliary exhaust air group. The packing ring is arranged between the outer wall of the air duct and the inner wall of the tower body;

[0014] The auxiliary exhaust air group includes a plurality of auxiliary exhaust fans arranged on the side wall of the tower body and a plurality of auxiliary exhaust fans arranged on the top wall of the tower body.

[0015] By adopting the above technical solution, the circulating cooling water in the first branch pipe group falls downward into the first cooling system. Since the packing ring blocks the gap between the outer wall of the air duct and the inner wall of the tower body, the circulating cooling water in the first branch pipe group can only pass through the packing ring. The packing can disperse the circulating cooling water into fine water droplets or water films. At the same time, the auxiliary exhaust fans arranged on the side wall of the tower body bring external dry cold air into the tower body. The air circulates upward and is discharged from the auxiliary exhaust fans at the top of the tower. The air flows from the bottom of the packing ring to the top of the packing ring. During this process, heat exchange occurs between the air and the circulating cooling water, causing part of the circulating cooling water to evaporate. During the evaporation process, the circulating cooling water absorbs heat, thereby achieving the purpose of cooling.

[0016] Optionally, the second cooling system includes a main exhaust air group and a packing block arranged between the end of the air duct close to the water receiving tray and the water receiving tray. The packing block is fixedly connected to the inner wall of the tower body;

[0017] The main exhaust air group includes a main exhaust fan arranged at a position close to the bottom of the side wall of the tower body and a main exhaust fan arranged at one end of the air duct away from the water receiving tray.

[0018] By adopting the above technical solution, when the amount of circulating cooling water entering the cooling tower is large, part of the circulating cooling water falls from the second branch pipe group into the second cooling system. The circulating cooling water falling from the second branch pipe group first enters the packing block. At this time, the main exhaust fan arranged at the bottom of the tower body sucks dry cold air into the tower body. The air flows upward through the packing block and exchanges heat with the circulating cooling water in the packing block. Then, with the exhaust of the main exhaust fan, the water vapor with heat is discharged out of the cooling tower along the air duct, thus completing the cooling of the circulating cooling water by the entire second cooling system.

[0019] Optionally, a water guiding surface is arranged between the packing ring and the second branch pipe group. The water guiding surface is annular, and the inner wall of the inner ring of the water guiding surface is fixedly connected to the outer wall of the air duct. The water guiding surface has an inclined surface that gradually approaches the water receiving tray from the air duct to the side wall of the tower body.

[0020] By adopting the above technical solution, since the second cooling system is arranged below the first cooling system, in order to enable the first cooling system and the second cooling system to operate independently, a water guiding surface is provided. The circulating cooling water cooled by the first cooling system drips onto the water guiding surface and can flow along the water guiding surface to the side wall of the tower body, and finally is discharged into the water receiving tray through the drainage channel and then discharged out of the cooling tower.

[0021] Optionally, a plurality of rib bones are fixedly arranged on the side wall of the water guiding surface close to the water receiving tray. One end of each rib bone is fixedly connected to the inner wall of the tower body, and the other end is fixedly connected to the outer wall of the air duct.

[0022] By adopting the above technical solution, since the circulating cooling water passing through the first cooling system drips onto the water guiding surface for a long time, the water guiding surface needs to bear a large impact force. Therefore, rib bones are arranged below the water guiding surface to enhance the strength of the water guiding surface and reduce the situation that it is difficult to stably connect the water guiding surface to the tower body due to the long-term drainage of the circulating cooling water along the water guiding surface.

[0023] Optionally, the first branch pipe group includes a plurality of first branch pipes communicated with the main water supply pipe. The first branch pipes are fixedly connected to the top wall of the tower body, and a plurality of atomizing nozzles are arranged along the length direction of each first branch pipe;

[0024] The second branch pipe group includes a plurality of second branch pipes communicated with one end of the main water supply pipe close to the water receiving tray. The second branch pipes are fixedly connected to the rib bones, and a plurality of atomizing nozzles are arranged along the length direction of each second branch pipe.

[0025] By adopting the above technical solution, a plurality of first branch pipes and a plurality of second branch pipes are provided, and a plurality of fog nozzles are arranged along the length direction of the first branch pipes and the second branch pipes, so that the circulating cooling water sprayed from the first branch pipe group to the packing rings or the second branch pipe group to the packing blocks is more evenly dispersed, thereby enabling the first cooling system or the second cooling system to have a better cooling effect on the circulating cooling water.

[0026] Optionally, a drainage surface is arranged in parallel at intervals on the inner wall of the tower body. One end of the drainage surface is fixedly connected to the side wall of the water guiding surface away from the air duct, and the other end of the drainage surface extends between the bottom of the second cooling system and the water receiving tray. A drainage channel for the water flow to drain into the water receiving tray is formed between the drainage surface and the inner wall of the tower body.

[0027] By adopting the above technical solution, after the circulating cooling water cooled by the first cooling system drops onto the water guiding surface, it drains into the drainage channel along the inclined slope of the water guiding surface. The circulating cooling water falls into the water receiving tray along the drainage surface. The drainage surface can separate the packing blocks from the circulating cooling water, enabling the circulating cooling water to drip into the water receiving tray more smoothly.

[0028] Optionally, the packing ring is a porous three-dimensional structure, and the packing block includes a plurality of through pipes. The plurality of through pipes are arranged in parallel, and the side walls of two adjacent through pipes are in contact and fixedly connected.

[0029] By adopting the above technical solution, since a plurality of auxiliary exhaust fans are arranged on the side wall of the tower body, a plurality of auxiliary exhaust fans are arranged on the top wall of the tower body, and the space between the bottom of the packing ring and the water guiding surface is small, the air flow direction in the first cooling system is relatively disordered. Setting the packing as a porous three-dimensional structure enables air in any direction to pass through the packing ring, and the porous packing ring has a larger contact area with the circulating cooling water, which can better cool the circulating cooling water;

[0030] Since there is a large space between the packing block and the water receiving tray, the air sucked into the tower body by the main exhaust fan first enters the space between the packing block and the water receiving tray, and then is discharged outward by the main exhaust fan at the top of the air duct. At this time, the air flow circulates upward and can circulate upward along the plurality of through pipes, thereby realizing the cooling effect on the circulating cooling water in the through pipes; in addition, arranging a plurality of through pipes can guide the circulating cooling water, enabling the circulating cooling water to flow down along the through pipes, making the circulating cooling water flow more smoothly.

[0031] Optionally, the through pipe is bent along the length direction, and protrusions are arranged on the inner wall of the through pipe.

[0032] By adopting the above technical solution, protrusions are provided on the inner wall of the through pipe, increasing the contact area between the circulating cooling water and the inner wall of the through pipe. On the one hand, the flow path of the circulating cooling water is lengthened, the cooling time is prolonged, and the cooling effect is better; on the other hand, more circulating cooling water can adhere to the inner wall of the through pipe, so that when the air circulates, it can be cooled.

[0033] Optionally, a waterproof partition is provided on the side of the auxiliary exhaust fan and the main exhaust fan close to the inside of the tower body. The waterproof partition includes a plurality of baffle plates arranged in parallel at intervals, and the baffle plates form an angle in the range of 10° to 30° with the inner wall of the tower body.

[0034] By adopting the above technical solution, since the auxiliary exhaust fan and the main exhaust fan are arranged on the side wall of the tower body, the circulating cooling water dripping from the first cooling system or the second cooling system is likely to splash onto the side wall of the tower body and enter the auxiliary exhaust fan or the main exhaust fan, causing damage to the auxiliary exhaust fan or the main exhaust fan. A waterproof partition is provided outside the main exhaust fan and the auxiliary exhaust fan. Since a plurality of baffle plates are arranged at intervals and the inclination angle is between 10° and 30°, the circulating cooling water splashing onto the side wall of the cooling tower can be blocked by the baffle plates, restricting the entry of the circulating cooling water into the main exhaust fan or the auxiliary exhaust fan; at the same time, since a plurality of baffle plates are arranged at intervals, the main exhaust fan or the auxiliary exhaust fan can smoothly suck the dry cold air outside into the cooling tower.

[0035] In summary, the present application includes at least one of the following beneficial effects:

[0036] 1. The first cooling system and the second cooling system are provided in the cooling tower, and the first cooling system and the second cooling system can cool the circulating cooling water simultaneously, thereby improving the cooling efficiency of the cooling tower;

[0037] 2. The packing rings and the packing blocks are set in different structural forms, enabling the first cooling system and the second cooling system to operate more efficiently;

[0038] 3. A waterproof partition is provided outside the main exhaust fan and the auxiliary exhaust fan, which can reduce the possibility of circulating cooling water entering the main exhaust fan or the auxiliary exhaust fan, making the main exhaust fan and the auxiliary exhaust fan not easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of the overall structure of the cooling tower according to an embodiment of the present application;

[0040] Figure 2 is a partial sectional view for showing the internal drainage surface of the cooling tower according to an embodiment of the present application;

[0041] Figure 3 is a partial sectional view for showing the internal structure of the cooling tower according to an embodiment of the present application;

[0042] Figure 4 It is a partial structural schematic diagram of the packing block in the embodiment of the present application;

[0043] Figure 5 It is a partial structural schematic diagram of the waterproof partition board used in the embodiment of the present application.

[0044] Explanation of reference numerals: 1, tower body; 11, water receiving tray; 12, water outlet pipe; 2, main water supply pipe; 3, first branch pipe; 31, atomizing nozzle; 4, second branch pipe; 5, first cooling system; 51, packing ring; 52, auxiliary exhaust fan; 53, auxiliary exhaust fan; 54, water guiding surface; 55, rib; 551, fixing member; 56, drainage surface; 57, drainage channel; 6, second cooling system; 61, packing block; 611, through pipe; 612, protrusion; 62, main exhaust fan; 63, main exhaust fan; 7, air duct; 8, waterproof partition board; 81, baffle. Detailed implementation manners

[0045] The following further elaborates on the present application in conjunction with the attached Figures 1-5 drawings.

[0046] A circular cooling tower disclosed in the embodiment of the present application, referring to Figure 1 , a circular cooling tower includes a tower body 1, and a vertical air duct 7 is provided in the center of the tower body 1. The air duct 7 extends upward and penetrates through the tower body 1 to communicate with the outside. A vertical main water supply pipe 2 is arranged in the air duct 7, and the main water supply pipe 2 is used to discharge circulating cooling water into the cooling tower. A first branch pipe group and a second branch pipe group are communicated with the main water supply pipe 2. The first branch pipe group is arranged above the second branch pipe group.

[0047] Referring to Figure 2 and Figure 3 , the first branch pipe group includes a plurality of first branch pipes 3 arranged at intervals along the circumferential side of the main water supply pipe 2. The plurality of first branch pipes 3 are all communicated with the main water supply pipe 2, and the first branch pipes 3 are fixed on the top wall of the tower body 1; the second branch pipe group is arranged at the end of the main water supply pipe 2 far from the outside. The second branch pipe group includes a plurality of second branch pipes 4 arranged at intervals along the end of the main water supply pipe 2. The plurality of second branch pipes 4 are also communicated with the main water supply pipe 2. The diameter of the main water supply pipe 2 is larger than the diameter of the first branch pipe 3 or the second branch pipe 4. A plurality of atomizing nozzles 31 are arranged on each of the first branch pipe 3 and the second branch pipe 4 along their own lengths, so that the circulating cooling water flowing into the first branch pipe 3 or the second branch pipe 4 can be evenly dispersed and sprayed into the cooling tower through the atomizing nozzles 31.

[0048] Referring to Figure 2 and Figure 3, a water receiving tray 11 is provided at the bottom of the tower body 1, and a water outlet pipe 12 for discharging the circulating cooling water in the cooling tower is connected to the bottom of the tower body 1. A first cooling system 5 is provided between the first branch pipe group and the second branch pipe group, and a second cooling system 6 is provided between the second branch pipe group and the water receiving tray 11. The first cooling system 5 includes a packing ring 51 and a secondary exhaust air group. The inner wall of the inner ring of the packing ring 51 is fixedly connected to the side wall of the air duct 7, and the outer wall of the outer ring of the packing ring 51 is fixedly connected to the inner wall of the tower body 1, so that the circulating cooling water sprayed downward from the first branch pipe group must pass through the packing ring 51 before flowing downward into the water receiving tray 11.

[0049] Refer to Figure 1 and Figure 2 , the secondary exhaust air group includes a plurality of secondary exhaust fans 52 provided on the side wall of the tower body 1 and a plurality of secondary exhaust fans 53 provided on the top wall of the tower body 1. The secondary exhaust fans 52 are provided below the packing ring 51 and above the second branch pipe group. The secondary exhaust fans 52 can suck dry and cold air into the tower body 1. By providing the secondary exhaust fans 52 below the packing ring 51 and the secondary exhaust fans 53 on the top wall of the tower body 1, an air flow can be formed in the tower body 1 that circulates from below the packing ring 51 to above the packing ring 51. Among them, the packing ring 51 is a porous structure. Setting the packing ring 51 as a porous structure increases the contact area between the circulating cooling water and the packing ring 51 on the one hand, and enables the air flow in any direction to pass through the packing ring 51 on the other hand. When the air flow passes through the packing ring 51, the dry and cold air can exchange heat with the circulating cooling water in the packing ring 51. The air flow takes away the heat in the circulating cooling water and discharges it into the air through the secondary exhaust fans 53, thereby realizing the cooling effect on the circulating cooling water.

[0050] Refer to Figure 2 and Figure 3 , a water guiding surface 54 is provided between the first cooling system 5 and the second cooling system 6. The circulating cooling water cooled by the first cooling system 5 drips downward from the packing ring 51 onto the water guiding surface 54. The water guiding surface 54 is annularly arranged, and the inner wall of the inner ring of the water guiding surface 54 is fixedly connected to the side wall of the air duct 7. A plurality of rib bones 55 are fixedly connected to the side wall of the water guiding surface 54 close to the water receiving tray 11. One end of the rib bones 55 is fixedly connected to the side wall of the air duct 7, and the other end is fixedly connected to the inner wall of the tower body 1. The arrangement of the rib bones 55 enables the rib bones 55 to support the water guiding surface 54 and enhance the stability of the water guiding surface 54.

[0051] Refer to Figure 2 and Figure 3, a drain surface 56 is fixed on the outer ring wall of the water guiding surface 54. The drain surface 56 is cylindrical, and the drain surface 56 is arranged parallel and spaced from the side wall of the tower body 1. The rib 55 passes through the drain surface 56. One end of the drain surface 56 is connected to the water guiding surface 54, and the other end extends between the bottom of the second cooling system 6 and the water receiving tray 11, so that a drainage channel 57 is formed between the drain surface 56 and the inner wall of the tower body 1. The water guiding surface 54 has an inclined surface that gradually approaches the water receiving tray 11 from the air duct 7 to the inner wall of the tower body 1. The water guiding surface 54 is inclined, so that the circulating cooling water dripping onto the water guiding surface 54 can smoothly flow into the drainage channel 57 and be discharged from the drainage channel 57 into the water receiving tray 11.

[0052] Refer to Figure 3 , the second sub-pipe group is arranged on the side of the water guiding surface 54 close to the water receiving tray 11, and a plurality of fixing members 551 are fixed on each rib 55. One end of the fixing member 551 away from the rib 55 is fixedly connected to the second sub-pipe 4. The fixing member 551 is provided to enable the second sub-pipe group to be fixedly connected to the rib 55, so that the second sub-pipe group can be kept stable.

[0053] Refer to Figure 1 and Figure 3 , the second cooling system 6 includes a main exhaust air group and a packing block 61 arranged below the second sub-pipe group. There is a distance between the packing block 61 and the end of the air duct 7 close to the water receiving tray 11. The main exhaust air group includes a main exhaust fan 62 and a main exhaust blower 63. The main exhaust fan 62 is arranged on the side wall of the tower body 1 between the bottom of the packing block 61 and the water receiving tray 11, and the main exhaust blower 63 is arranged at the port of the air duct 7 communicating with the outside.

[0054] Refer to Figure 3 and Figure 4 , the packing block 61 includes a plurality of through pipes 611. The plurality of through pipes 611 are all arranged vertically, and each through pipe 611 is bent along the length direction according to the same bending direction and bending curvature. The side walls of any two adjacent through pipes 611 are attached and fixedly connected, and a number of protrusions 612 are arranged on the inner wall of the through pipe 611.

[0055] Refer to Figure 1 and Figure 3, the circulating cooling water sprayed from the second pipe group falls into the packing block 61. At the same time, the main exhaust fan 62 sucks air into the tower body 1, and the main exhaust fan 63 exhausts air outwards, so that there is an upward air flow in the packing block 61. The dry and cold air passes through the packing block 61 along the through pipe 611. At this time, the circulating cooling water attached to the inner wall of the through pipe 611 can exchange heat with the dry and cold air, so that the circulating cooling water in the packing block 61 is cooled and discharged from the tower body 1 through the air. At the same time, the cooled circulating cooling water drips into the water receiving tray 11 after passing through the packing block 61, realizing the cooling cycle of the second cooling system 6. By providing protrusions 612 on the inner wall of the through pipe 611, the contact area between the circulating cooling water and the inner wall of the through pipe 611 can be increased, so that the circulating cooling water can better adhere to the inside of the through pipe 611, thereby making the cooling effect of the second cooling system 6 on the circulating cooling water better.

[0056] Referring to Figure 1 and Figure 5 , a waterproof partition 8 is provided inside the tower body 1 near the main exhaust fan 62 and the auxiliary exhaust fan 52. The waterproof partition 8 includes a plurality of baffle plates 81. The plurality of baffle plates 81 are arranged in parallel at intervals, and the baffle plates 81 are fixedly connected to the tower body 1. There is an angle of 10°-30° between the baffle plates 81 and the side wall of the tower body 1. By providing the waterproof partition 8, the circulating cooling water falling into the water receiving tray 11 from top to bottom is not likely to splash into the main exhaust fan 62 or the auxiliary exhaust fan 52, reducing the occurrence of damage to the main exhaust fan 62 or the auxiliary exhaust fan 52 due to the circulating cooling water splashing into the interior. At the same time, the baffle plates 81 are arranged at an angle and at intervals, so that while the baffle plates 81 can block water, the outside air can also smoothly enter the interior of the tower body 1.

[0057] The implementation principle of a circular cooling tower according to an embodiment of the present application is as follows: The circulating cooling water with heat generated in the production workshop enters the tower body 1 through the main water supply pipe 2. When the flow rate of the circulating cooling water is large, part of the circulating cooling water enters the first pipe group and is evenly sprayed into the first cooling system 5 through the first pipe 3; the other part of the circulating cooling water enters the second pipe group and is evenly sprayed into the second cooling system 6 through the second pipe 4. The first cooling system 5 and the second cooling system 6 cool the circulating cooling water at the same time to improve the cooling efficiency of the cooling tower.

[0058] In the first cooling system 5, a plurality of auxiliary exhaust fans 52 provided on the side wall of the tower body 1 and a plurality of auxiliary exhaust fans 53 provided on the top wall of the tower body 1 cooperate with each other to realize the air flow in the first cooling system 5. The flowing air exchanges heat with the circulating cooling water in the packing ring 51 to realize the cooling of the circulating cooling water. At the same time, the packing ring 51 is set as a porous structure, so that air flows in all directions can pass through the packing ring 51 and be discharged from the auxiliary exhaust fan 52.

[0059] In the second cooling system 6, due to the large space between the water receiving tray 11 and the packing block 61, the air drawn in by the main exhaust fan 62 can first enter the space between the water receiving tray 11 and the packing block 61, and then the main exhaust fan 63 sucks the air in the tower body 1, so that the dry cold air in the space can flow upward along the packing block 61. At this time, the air can flow upward along the through pipe 611 to be discharged from the tower body 1, and the circulating cooling water in the through pipe 611 can be cooled when the air flows along the through pipe 611.

[0060] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A circular cooling tower, characterized in that: It includes a tower body (1), a main water supply pipe (2) is arranged at the center of the tower body (1), and a first branch pipe group and a second branch pipe group are communicated with the main water supply pipe (2); A first cooling system (5) and a second cooling system (6) are further arranged inside the tower body (1). The first branch pipe (3) group is arranged above the first cooling system (5), the second branch pipe (4) group is arranged above the second cooling system (6), and the first cooling system (5) is arranged above the second branch pipe group; A water receiving tray (11) is arranged at the bottom of the tower body (1). Both the first cooling system (5) and the second cooling system (6) are communicated with the water receiving tray (11), and a water outlet pipe (12) is communicated with the water receiving tray (11); An air duct (7) is vertically arranged at the center of the tower body (1), and the main water supply pipe (2) is located inside the air duct (7); The first cooling system (5) includes packing rings (51) and a secondary exhaust air group. The packing rings (51) are arranged between the outer wall of the air duct (7) and the inner wall of the tower body (1); The secondary exhaust air group includes a plurality of secondary exhaust fans (52) arranged on the side wall of the tower body (1), and a plurality of secondary exhaust fans (53) arranged on the top wall of the tower body (1); The second cooling system (6) includes a main exhaust air group and packing blocks (61) arranged between the end of the air duct (7) close to the water receiving tray (11) and the water receiving tray (11). The packing blocks (61) are fixedly connected with the inner wall of the tower body (1); The main exhaust air group includes a main exhaust fan (62) arranged at a position close to the bottom of the side wall of the tower body (1), and a main exhaust fan (63) arranged at one end of the air duct (7) far from the water receiving tray (11); A water guiding surface (54) is arranged between the packing rings (51) and the second branch pipe group. The water guiding surface (54) is annular, and the inner wall of the inner ring of the water guiding surface (54) is fixedly connected with the outer wall of the air duct (7). The water guiding surface (54) has an inclined surface that gradually approaches the water receiving tray (11) from the air duct (7) to the side wall of the tower body (1); The inner wall of the tower body (1) is provided with a drainage surface (56) at parallel intervals. One end of the drainage surface (56) is fixedly connected with the side wall of the water guiding surface (54) far from the air duct (7), and the other end of the drainage surface (56) extends between the bottom of the second cooling system (6) and the water receiving tray (11). A drainage channel (57) for the water flow to drain into the water receiving tray (11) is formed between the drainage surface (56) and the inner wall of the tower body (1).

2. A circular cooling tower according to claim 1, characterized in that: A plurality of rib bones (55) are fixedly arranged on the side wall of the water guiding surface (54) close to the water receiving tray (11). One end of the rib bones (55) is fixedly connected with the inner wall of the tower body (1), and the other end is fixedly connected with the outer wall of the air duct (7).

3. A circular cooling tower according to claim 2, characterized in that: The first branch pipe group includes a plurality of first branch pipes (3) communicated with the main water supply pipe (2). The first branch pipes (3) are fixedly connected to the top wall of the tower body (1), and a plurality of mist nozzles (31) are arranged along the length direction of the first branch pipes (3); The second branch pipe group includes a plurality of second branch pipes (4) communicated with one end of the main water supply pipe (2) close to the water receiving tray (11). The second branch pipes (4) are fixedly connected with the rib bones (55), and a plurality of fog nozzles (31) are arranged on each second branch pipe (4) along the length direction.

4. A circular cooling tower according to claim 1, characterized in that: The packing ring (51) is a porous three-dimensional structure. The packing block (61) includes a plurality of through pipes (611). The plurality of through pipes (611) are arranged in parallel, and the side walls of two adjacent through pipes (611) are attached and fixedly connected.

5. A circular cooling tower according to claim 4, characterized in that: The through pipe (611) is bent along the length direction, and protrusions (612) are arranged on the inner wall of the through pipe (611).

6. A circular cooling tower according to claim 1, characterized in that: A waterproof partition plate (8) is arranged on one side of the auxiliary exhaust fan (52) and the main exhaust fan (62) close to the inside of the tower body (1). The waterproof partition plate (8) includes a plurality of baffle plates (81) arranged in parallel at intervals, and the baffle plates (81) form an angle in the range of 10°-30° with the inner wall of the tower body (1).

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