Countercurrent closed cooling tower

Abstract

The utility model discloses a countercurrent closed cooling tower, and relates to the field of cooling towers, the countercurrent closed cooling tower comprises a tower body, the top end of the tower body is provided with an air outlet, a spraying pipeline and a cooling section filler are arranged below the air outlet, an inclined diversion trench is arranged below the cooling section filler, and the tower body is provided with a heat exchange coil pipe at the lower end of the diversion trench. A cold air opening is formed in the side wall of the tower body, a water distribution assembly is arranged at the position, right opposite to the lower ends of the diversion trenches, of the heat exchange coil pipe, and a water collection circulating pool is arranged at the bottom of the tower body. Cold air directly and upwards exchanges heat with spraying water, the cold air does not need to pass through the heat exchange coil pipe, meanwhile, all the spraying water is guided by the flow guide grooves, wind resistance is greatly reduced, the spraying water is guided to the position above the heat exchange coil pipe through the inclined flow guide grooves, a water-free area is formed at the bottom of the tower body, a maintenance space is reserved, the spraying water is concentrated on the two sides, and the maintenance efficiency is improved. The water flow per unit area is increased, the flow speed is improved, heat exchange between spraying water and the coil pipe is more sufficient, and the heat transfer effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of cooling towers, and more specifically, to a countercurrent closed cooling tower. Background Art

[0002] In a countercurrent closed cooling tower, that is, the spray water flows in the opposite direction to the wind direction, the spray water flows from top to bottom, and the wind flows from bottom to top. The air inlet form of the countercurrent closed cooling tower is bottom air inlet. Dry and low-temperature air is inhaled from the lower part of the tower, and alternates reversely with the falling spray water. After absorbing heat and moisture, it forms saturated humid and hot air, and the hot air is discharged by the top fan. Below the top fan is the cooling section filler, and below the cooling section filler is the heat exchange coil. The spray water falls from the cooling section filler to exchange heat with the fresh air, and finally falls into the lower cooling coil. After the spray water evaporates, during the rising process of the extracted saturated humid and hot air, part of the water droplets are carried away and blocked back by a dehydrator with a special structure and then returned to the water collection tank for recycling. The internal circulating water takes away heat energy due to the evaporation latent heat of the spray water, and through heat exchange on the pipe wall, reduces the temperature of the circulating medium inside the pipe, achieving the purpose of cooling and temperature reduction, and does not affect the purity and quantity of the internal medium, ensuring the stable composition of the internal circulating medium.

[0003] During the process where the spray water flows in the opposite direction to the wind direction, the spray water flows from top to bottom, and the wind flows from bottom to top, the wind resistance is relatively large. Because the spray water continuously falls, forming dense water droplets, the wind resistance is increased. At the same time, due to the bottom air inlet, the fresh air blows off the cooling water attached to the cooling coil, reducing the contact time between the coil and the cooling water, resulting in insufficient heat exchange and cooling.

[0004] Moreover, this setting leads to low heat exchange efficiency of the cooling coil. The entire device structure is closed, and it is not easy to overhaul and maintain during long-term operation. It often needs to be shut down for overhaul and maintenance after long-term use, affecting production efficiency. At the same time, due to the inability to maintain frequently, the internal components are damaged too quickly. Summary of the Utility Model

[0005] The purpose of the utility model is: to solve the above technical problems, the utility model provides a countercurrent closed cooling tower.

[0006] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0007] A countercurrent closed cooling tower, comprising a tower body. An air outlet with a fan is provided at the top of the tower body. Below the air outlet, a spray pipe and a cooling section filler are provided. Below the cooling section filler, an inclined diversion trough is provided. A heat exchange coil is provided at the low end of the diversion trough in the tower body. A cavity for air flow to pass through is provided between the diversion troughs. A cold air opening is provided on the side wall of the tower body, which is located above the heat exchange coil and does not exceed the upper end of the diversion trough. A water distribution assembly is provided on the heat exchange coil opposite to the low end of the diversion trough. A collection water circulation pool is provided at the bottom of the tower body, which is connected to the spray pipe through a water pump for water conveyance.

[0008] With the above scheme, the spray water is conveyed from the collection water circulation pool to the spray pipe through a pumping pipeline. The spray water completes the preliminary heat exchange with the cold air entering through the cold air opening in the cooling section filler, the space below and the cavity. The cooler cooling water then converges into a water flow through the diversion trough and drips onto the water distribution assembly on the heat exchange coil. The water flow is distributed on the heat exchange coil through the water distribution assembly. A hot solution is introduced into the heat exchange coil. The cooling water comes into full contact with the heat exchange coil to complete the heat exchange. At this time, the temperature of the solution in the heat exchange coil drops to form a colder liquid output. At this time, the heated cooling water falls into the lower collection water circulation pool to complete the subsequent cycle. In the structure of this application, the cold air directly exchanges heat with the spray water upward, and the cold air does not need to pass through the heat exchange coil. At the same time, all the spray water is also diverted by the diversion trough, greatly reducing the wind resistance. The spray water is diverted to the upper part of the heat exchange coil through the inclined diversion trough, which can form a water-free area at the bottom of the tower body, reserving a maintenance space, facilitating later entry for maintenance, allowing maintenance without shutting down the machine. The maintenance process is simple and convenient, with high safety and no impact on production. For a countercurrent closed cooling tower, it can greatly extend the service life, reduce the wind resistance at the same time, reduce the power consumption of the air outlet fan, concentrate the spray water on both sides, increase the water flow rate per unit area, improve the flow velocity, make the heat exchange between the spray water and the coil more sufficient, enhance the heat transfer effect, and be more energy-saving and environmentally friendly as a whole, with great economic value.

[0009] Further, there are 2 groups of the diversion troughs. The high part of the diversion trough is directly opposite to the middle part of the cooling section filler, and the low part of the diversion trough faces the inner side wall of the tower body. The 2 groups of diversion troughs are symmetrically distributed below the cooling section filler.

[0010] With the above scheme, after the spray water falls into the diversion trough, it falls along the inclined diversion trough into the heat exchange coils on both sides of the tower body. The 2 groups of diversion troughs are symmetrically distributed below the cooling section filler, so the heat exchange coils below are also symmetrically arranged.

[0011] Further, the heat exchange coils are symmetrically arranged in the tower body. An inspection path is provided above the collection water circulation pool in the tower body, and the inspection path is directly opposite to the heat exchange coils on both sides.

[0012] Through the above solution, a maintenance path is provided to facilitate the daily maintenance and repair work of the staff, improving the maintenance efficiency.

[0013] Furthermore, a support frame is provided between the bottom of the maintenance path and the water circulation pool, and water permeable holes are distributed on the support frame.

[0014] Through the above solution, the support frame is provided to facilitate lifting the maintenance path out of the water surface of the water circulation pool. The water permeable holes are provided to facilitate the circulation of the cooling water.

[0015] Furthermore, the water distribution component includes a water distribution sieve provided at the upper end of the cooling coil. The low end of the diversion trough extends into one side of the water distribution sieve, and sieve holes are distributed on the water distribution sieve.

[0016] Through the above solution, by providing the water distribution sieve, the cooling water flowing down from the diversion trough can be redistributed and fall into the lower cooling coil through the sieve holes, promoting the dispersion of the water flow and avoiding the concentrated impact of the cooling water flow on the fixed area of the cooling coil, increasing the contact area between the cooling water and the cooling coil.

[0017] Furthermore, a spray water flow is formed at the low end of the diversion trough, and the distribution density of the sieve holes on the water distribution sieve continuously increases from the position directly facing the low end of the diversion trough to the distal end.

[0018] Through the above solution, the distribution density of the sieve holes continuously increases from the position directly facing the low end of the diversion trough to the distal end, facilitating the redistribution of the water flow according to the flow rate, reducing the concentrated impact of the spray water flow, promoting the flow rate of the water flow in each area to be close, and promoting the uniform contact between the cooling water and the cooling coil.

[0019] Furthermore, there are no less than 2 cold air openings, and the cold air openings extend obliquely upward to the outside of the tower body.

[0020] Through the above solution, the splashing of the internal cooling water is reduced, and at the same time, the entry of external sundries is reduced.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. The sprayed water is transported from the collected water circulation pool to the spray pipe through the pumping pipe. The sprayed water completes the preliminary heat exchange with the cold air entering through the cold air opening in the packing and the lower space and cavity of the cooling section. The cooler cooling water then converges into a water flow through the diversion trough and drips onto the water distribution component on the heat exchange coil. The water flow is distributed on the heat exchange coil through the water distribution component. A hot solution is introduced into the heat exchange coil. The cooling water comes into full contact with the heat exchange coil to complete the heat exchange. At this time, the temperature of the solution in the heat exchange coil drops to form a colder liquid output. At this time, the heated cooling water falls into the lower collected water circulation pool to complete the subsequent cycle. With this structure of the present application, the cold air directly exchanges heat with the sprayed water upward, and the cold air does not need to pass through the heat exchange coil. At the same time, all the sprayed water is also diverted by the diversion trough, greatly reducing the wind resistance. The sprayed water is diverted to the upper part of the heat exchange coil through the inclined diversion trough, which can form a water-free area at the bottom of the tower body, reserving a maintenance space, facilitating later entry for maintenance, allowing maintenance without shutting down the machine, with a simple and convenient maintenance process, high safety, and no impact on production. For a countercurrent closed cooling tower, it can greatly extend the service life, reduce the wind resistance at the same time, reduce the power consumption of the outlet fan, be more energy-saving and environmentally friendly as a whole, and has great economic value;

[0023] 2. By setting the water distribution sieve, the cooling water flow falling from the diversion trough can be redistributed and fall into the lower cooling coil through the sieve holes, promoting the dispersion of the water flow and avoiding the concentrated impact of the cooling water flow on the fixed area of the cooling coil, increasing the contact area between the cooling water and the cooling coil. Brief Description of the Drawings

[0024] Figure 1 is the front view structural schematic diagram of the present utility model;

[0025] Figure 2 is the side view structural schematic diagram of the present utility model;

[0026] Reference Numerals: 11, tower body; 12, air outlet; 13, spray pipe; 14, packing in the cooling section; 15, diversion trough; 16, heat exchange coil; 17, cold air opening; 18, collected water circulation pool; 19, maintenance path; 20, support frame; 21, water distribution sieve; 22, sieve holes. Detailed Embodiment

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] As Figure 1 and Figure 2 , a countercurrent closed cooling tower includes a tower body 11. At the top of the tower body 11, there is an air outlet 12 with a fan. Below the air outlet 12, there are a spray pipe 13 and a cooling section packing 14. Below the cooling section packing 14, there is an inclined diversion trough 15. At the low end of the diversion trough 15 in the tower body 11, there is a heat exchange coil 16. The heat source of the heat exchange coil 16 is input from the bottom, and the cooled cold source is output from the upper end. There is a cavity for air flow between the diversion troughs 15. On the side wall of the tower body 11, there is a cold air opening 17. The cold air opening 17 is located above the heat exchange coil 16 and does not exceed the upper end of the diversion trough 15. Referring to Figure 1 , there are no less than 2 cold air openings 17. The cold air openings 17 extend obliquely upward to the outside of the tower body 11, reducing the splashing of internal cooling water and at the same time reducing the entry of external sundries. At the position on the heat exchange coil 16 directly opposite to the low end of the diversion trough 15, there is a water distribution assembly. At the bottom of the tower body 11, there is a circulating water collection pool 18 that is connected to the spray pipe 13 through a water pump. The spray water is transported from the circulating water collection pool 18 to the spray pipe 13 through a pumping pipeline. The spray water completes preliminary heat exchange with the cold air entering through the cold air opening 17 in the cooling section packing 14 and the lower space and cavity. The cooler cooling water then converges into a water flow through the diversion trough 15 and drips onto the water distribution assembly on the heat exchange coil 16. The water flow is distributed on the heat exchange coil 16 through the water distribution assembly. A hot solution is introduced into the heat exchange coil 16. The cooling water is in full contact with the heat exchange coil 16 to complete heat exchange. At this time, the temperature of the solution in the heat exchange coil 16 drops to form a colder liquid output. At this time, the heated cooling water falls into the lower circulating water collection pool 18 to complete the subsequent cycle. With this structure of the present application, the cold air directly exchanges heat with the spray water upward, and the cold air does not need to pass through the heat exchange coil 16. At the same time, all the spray water is also diverted by the diversion trough 15, greatly reducing the wind resistance. By the inclined diversion trough 15, the spray water is diverted to above the heat exchange coil 16, an area without water can be formed at the bottom of the tower body 11, leaving a maintenance space, which is convenient for later entry for maintenance. It can be maintained without shutting down the machine. The maintenance process is simple and convenient, with high safety and no impact on production. For a countercurrent closed cooling tower, the service life can be greatly extended, the wind resistance can be reduced at the same time, the power consumption of the fan at the air outlet 12 can be reduced, the spray water is concentrated on both sides, the water flow rate per unit area increases, the flow velocity increases, the heat exchange between the spray water and the coil is more sufficient, the heat transfer effect is improved, and the overall is more energy-saving and environmentally friendly, having great economic value.

[0031] As Figure 1 and Figure 2 shown, there are two sets of diversion channels 15. The higher part of the diversion channels 15 faces the middle part of the packing 14 in the cooling section, and the lower part of the diversion channels 15 faces the inner side wall of the tower body 11. The two sets of diversion channels 15 are symmetrically distributed below the packing 14 in the cooling section. After the sprayed water falls into the diversion channels 15, it falls along the inclined diversion channels 15 into the heat exchange coils 16 on both sides of the tower body 11. The two sets of diversion channels 15 are symmetrically distributed below the packing 14 in the cooling section, so the heat exchange coils 16 below are also symmetrically arranged.

[0032] As Figure 1 and Figure 2 shown, the heat exchange coils 16 are symmetrically arranged inside the tower body 11. An inspection path 19 is provided above the water circulation pool 18 inside the tower body 11. The inspection path 19 is arranged opposite to the heat exchange coils 16 on both sides. A support frame 20 is provided between the bottom of the inspection path 19 and the water circulation pool 18. The support frame 20 is distributed with water permeable holes (not shown in the figure). By providing the inspection path 19, it is convenient for the staff to carry out daily maintenance and inspection, improving the inspection efficiency. By providing the support frame 20, it is convenient to lift the inspection path 19 to be separated from the water surface of the water circulation pool 18. By providing the water permeable holes, it is convenient for the cooling water to circulate.

[0033] As Figure 1 and Figure 2 shown, the water distribution assembly includes a water distribution sieve 21 provided at the upper end of the heat exchange coil. The low end of the diversion channel 15 extends into one side of the water distribution sieve 21. The water distribution sieve 21 is distributed with sieve holes 22. The low end of the diversion channel 15 forms a water flow of the sprayed water. The distribution density of the sieve holes 22 on the water distribution sieve 21 continuously increases from the position directly facing the low end of the diversion channel 15 to the far end. By providing the water distribution sieve 21, the cooling water flow falling from the diversion channel 15 can be redistributed and fall into the lower cooling coil through the sieve holes 22, promoting the dispersion of the water flow, avoiding the concentrated impact of the cooling water flow on the fixed area of the cooling coil, increasing the contact area between the cooling water and the cooling coil. The distribution density of the sieve holes 22 continuously increases from the position directly facing the low end of the diversion channel 15 to the far end, facilitating the redistribution of the water flow according to the flow rate, reducing the concentrated impact of the sprayed water flow, promoting the water flow to be close in each area, and promoting the uniform contact between the cooling water and the cooling coil.

[0034] Implementation principle: The sprayed water is transported from the water collection and circulation pool 18 to the spray pipe 13 through the pumping pipeline. The sprayed water completes the preliminary heat exchange with the cold air entering through the cold air opening 17 in the packing 14 and the lower space and cavity of the cooling section. Subsequently, the cooler cooling water converges into a water flow through the diversion trough 15 and is sprayed onto the water distribution component on the heat exchange coil 16. The water flow is distributed on the heat exchange coil 16 through the water distribution component. A hot solution is introduced into the heat exchange coil 16. The cooling water is in full contact with the heat exchange coil 16 to complete the heat exchange. At this time, the temperature of the solution in the heat exchange coil 16 drops to form a colder liquid output. At this time, the heated cooling water falls into the lower water collection and circulation pool 18 to complete the subsequent cycle. In this structure of the present application, the cold air directly exchanges heat with the sprayed water upward, and the cold air does not need to pass through the heat exchange coil 16. At the same time, all the sprayed water is diverted by the diversion trough 15, greatly reducing the wind resistance. The sprayed water is diverted to the upper part of the heat exchange coil 16 through the inclined diversion trough 15, which can form a water-free area at the bottom of the tower body 11, reserving a maintenance space, facilitating later entry for maintenance, enabling maintenance without shutting down the machine. The maintenance process is simple and convenient, with high safety and no impact on production. For a countercurrent closed cooling tower, the service life can be greatly extended, and at the same time, the wind resistance is reduced, which can reduce the power consumption of the fan at the air outlet 12. The sprayed water is concentrated on both sides, increasing the water flow rate per unit area and the flow velocity. The heat exchange between the sprayed water and the coil is more sufficient, improving the heat transfer effect, and the overall is more energy-saving and environmentally friendly, with great economic value.

Claims

1. A countercurrent closed cooling tower, comprising a tower body (11), wherein the top of the tower body (11) is provided with an air outlet (12) with a fan, and a spray pipe (13) and a cooling section filler (14) are provided below the air outlet (12), characterized in that: An inclined guide groove (15) is provided below the cooling section filler (14); a heat exchange coil (16) is provided on the tower body (11) at the lower end of the guide groove (15); the guide grooves (15) are arranged at intervals to form a cavity for air flow to pass through; a cold air opening (17) is provided on the side wall of the tower body (11); the cold air opening (17) is located above the heat exchange coil (16) and does not exceed the upper end of the guide groove (15); a water distribution component is provided on the heat exchange coil (16) directly facing the lower end of the guide groove (15); and a water collection circulation pool (18) is provided at the bottom of the tower body (11) for conveying water through a water pump connected to the spray pipe (13).

2. A countercurrent closed cooling tower according to claim 1, characterized in that: The guide grooves (15) are provided with two groups, the upper part of the guide grooves (15) is directly opposite to the middle part of the cooling section filler (14), and the lower part of the guide grooves (15) is facing the inner wall of the tower body (11), and the two groups of guide grooves (15) are symmetrically distributed below the cooling section filler (14).

3. A counter-flow closed cooling tower according to claim 2, characterized in that: The heat exchange coils (16) are symmetrically arranged in the tower body (11), and an inspection path (19) is provided on the water collection circulation pool (18) in the tower body (11), and the inspection path (19) is arranged opposite to the heat exchange coils (16) on both sides.

4. A counter-flow closed cooling tower according to claim 3, characterized in that: A support frame (20) is provided between the bottom of the inspection road (19) and the water collection circulation pool (18), and water permeable holes are distributed on the support frame (20).

5. A counter-flow closed cooling tower according to claim 2, characterized in that: The water distribution assembly comprises a water distribution screen (21) arranged at the upper end of the heat exchange coil, the lower end of the guide groove (15) extends into one side of the water distribution screen (21), and the water distribution screen (21) is provided with sieve holes (22).

6. A counter-flow closed cooling tower according to claim 5, characterized in that: A spray water flow is formed at the lower end of the guide groove (15), and the distribution density of the sieve holes (22) on the water distribution screen (21) increases continuously from the lower end directly opposite to the guide groove (15) toward the far end.

7. A counter-flow closed cooling tower according to claim 1, characterized in that: The number of the cold air openings (17) is no less than two, and the cold air openings (17) extend obliquely upward to the outside of the tower body (11).

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