Closed circulating water cooling tower

Abstract

The utility model discloses a closed circulating water cooling tower. The closed circulating water cooling tower comprises a cooling tower main body, a pump station and a pure water treatment system, the pure water treatment system is communicated with the pump station; the cooling tower main body comprises a tower frame body, a fan, a spraying pump as well as a heat exchange tube bundle, a water collector, a spraying device and a water collecting tank which are positioned in the tower frame body, and an air inlet and an air outlet are formed in the tower frame body; the fan is assembled on the tower frame body; the heat exchange tube bundle is provided with an inlet end and an outlet end communicated with the pump station, and the spraying pump enables water in the water collecting tank to be conveyed to the spraying device. The pure water treatment system comprises a first delivery pump, a filter unit and a reverse osmosis unit, the first delivery pump is communicated between the filter unit and the reverse osmosis unit, and the reverse osmosis unit is communicated with the pump station; pure water is used for supplying water, high quality of water and stable water supply are guaranteed, addition of agents such as scale inhibitors is reduced, the sewage discharging period of the water collecting tank is prolonged, and the operation cost is reduced; in addition, air cooling and water cooling are adopted for cooling, the optimal operation effect is achieved, and more energy and water are saved.

Description

Technical Field

[0001] This utility model relates to the technical field of cooling towers, and more particularly to a closed-loop circulating water cooling tower. Background Technology

[0002] As is well known, a closed-circuit cooling tower (also called an evaporative air cooler) is a design in a cooling system used to recover and reuse circulating water.

[0003] Unlike traditional open cooling towers, closed-circuit cooling towers utilize a sealed heat exchanger placed inside the tower. Cooling is achieved through heat exchange between circulating air, external spray water, and internal circulating water. Because the circulating water circulates within a closed system, it avoids contact with the external environment, reducing the risk of contaminants entering the system, ensuring water quality, and effectively protecting the efficient operation of the main equipment, thus extending its service life. Consequently, closed-circuit cooling towers have been widely used in industries such as chemical production in recent years.

[0004] In existing closed-circuit cooling towers, tap water circulates between the tower and the water-using equipment, and the circulating return water from the water-using equipment is cooled to ensure that the water-using equipment operates at a suitable temperature.

[0005] However, since existing closed cooling towers use tap water directly between themselves and water-using equipment, this shortens the sewage discharge cycle of the water collection tank, increasing operating costs and the amount of scale inhibitors and other chemicals required.

[0006] In addition, in existing closed-circuit cooling towers, the spraying device sprays the tubular heat exchanger through fixed pipes, which can lead to uneven spraying or blind spots.

[0007] In addition, existing closed-loop cooling towers have the drawback that water consumption and loss cannot be replenished in a timely and effective manner.

[0008] Therefore, a closed-loop circulating water cooling tower is needed to overcome one or more of the above-mentioned defects. Utility Model Content

[0009] The purpose of this invention is to provide a closed-loop circulating water cooling tower that uses pure water supply to ensure high water quality and stable water supply, reduces the addition of scale inhibitors and other agents, extends the drainage cycle of the water collection tank, and reduces operating costs. In addition, it uses air cooling and water cooling to achieve the best operating effect, thus saving more energy and water.

[0010] To achieve the above objectives, the closed-loop circulating water cooling tower of this utility model includes a cooling tower body, a pump station, and a pure water treatment system for treating tap water into pure water. The cooling tower body includes a tower frame, a fan, a spray pump, and heat exchange tube bundles, a water collector, a spray device, and a water collection tank located within the tower frame. The tower frame has an air inlet and an air outlet. The fan is mounted on the tower frame and allows external air to enter through the air inlet and exit through the air outlet. The heat exchange tube bundle has an inlet end and an outlet end connected to the pump station. The water collector is located above the heat exchange tube bundle, the spray device is located between the heat exchange tube bundle and the water collector, and the water collection tank is located below the heat exchange tube bundle. The spray pump transports water from the water collection tank to the spray device. The pure water treatment system includes a first delivery pump and a filtration unit and a reverse osmosis unit that sequentially perform filtration and reverse osmosis treatment on tap water. The first delivery pump is connected between the filtration unit and the reverse osmosis unit, and the reverse osmosis unit is connected to the pumping station.

[0011] Compared with existing technologies, this invention's closed-loop circulating water cooling tower utilizes a design that includes a first delivery pump and a filtration unit and a reverse osmosis unit that sequentially filter and reverse osmosis the tap water, with the first delivery pump connected between the filtration unit and the reverse osmosis unit, and the reverse osmosis unit connected to the pumping station. This design ensures high-quality water and stable water supply by using pure water, reducing the need for scale inhibitors and other chemicals, extending the drainage cycle of the water collection tank, and lowering operating costs. Furthermore, the use of air cooling and water cooling achieves optimal operating results, resulting in greater energy and water conservation.

[0012] Preferably, the pump station includes an external circulation pump, a pure water makeup tank, and a pressure stabilizing unit. The pressure stabilizing unit is connected to the pure water makeup tank and the external circulation pump. The external circulation pump is also connected to the outlet end of the heat exchange tube bundle. The pure water treatment system is used to send the treated pure water into the pure water makeup tank.

[0013] Preferably, a control valve is provided between the pure water replenishment tank and the water collection tank to control the replenishment of pure water from the pure water replenishment tank to the water collection tank.

[0014] Preferably, the pressure stabilizing unit includes a booster pump connected between the pure water replenishment tank and the external circulation pump, and a pressure tank connected to the external circulation pump.

[0015] Preferably, the pressure tank is a diaphragm pressure tank.

[0016] Preferably, the heat exchange tube bundle is a serpentine tube bundle.

[0017] Preferably, the air outlet is located at the top of the tower frame, and the air inlet is located at the side of the tower frame.

[0018] Preferably, the spray nozzle of the spraying device is a basket-type nozzle.

[0019] Preferably, the pure water treatment system further includes a pure water storage tank for storing the pure water obtained after treatment by the reverse osmosis unit and a second delivery pump for conveying the pure water in the pure water storage tank to the pumping station.

[0020] Preferably, the filtration unit includes a dosing tank and a multi-media filter, an activated carbon filter, and a precision filter connected in sequence, with the dosing tank arranged between the activated carbon filter and the precision filter; the first delivery pump is a high-pressure pump.

[0021] Preferably, the closed-loop circulating water cooling tower of this utility model further includes a cleaning water tank and a cleaning water pump for cleaning the reverse osmosis unit, and the reverse osmosis unit is also provided with a cleaning inlet end and a cleaning outlet end.

[0022] Preferably, the closed-loop circulating water cooling tower of this utility model also includes an electrical control system, which includes a control cabinet, an operation panel, a frequency converter, a flow meter, a temperature transmitter, and a pressure transmitter. Attached Figure Description

[0023] Figure 1 The diagram shows a plan view of the closed-loop circulating water cooling tower of this invention after it is connected to the water-using equipment.

[0024] Figure 2 This is a plan view of the filtration unit of the pure water treatment system in the closed-loop circulating water cooling tower of this utility model.

[0025] Figure 3 This is a plan view of the pure water treatment system in the closed-loop circulating water cooling tower of this utility model, excluding the filtration unit.

[0026] Figure 4 This is a plan view of the cooling tower body, pump station, and water-using equipment in the closed-loop circulating water cooling tower of this utility model.

[0027] Figure 5 This is a plan view of the cleaning water tank, cleaning water pump, and cleaning filter in the closed-loop circulating water cooling tower of this utility model.

[0028] Figure 6 This is a plan view of the main body of the closed-loop circulating water cooling tower of this utility model.

[0029] Figure 7 This is a plan view of the electrical control system in the closed-loop circulating water cooling tower of this utility model. Detailed Implementation

[0030] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0031] Please see Figure 1 The closed-loop circulating water cooling tower 100 of this invention is used to circulate pure water to water-using equipment 200 and to cool the circulating return water of water-using equipment 200, thereby ensuring that water-using equipment 200 operates at a suitable temperature. Combined with... Figure 6 The closed-loop circulating water cooling tower 100 of this utility model includes a cooling tower body 10, a pump station 20, and a pure water treatment system 30 for treating tap water into pure water.

[0032] The cooling tower body 10 includes a tower frame 11, a fan 12, a spray pump 13, and a heat exchange tube bundle 14, a water collector 15, a spray device 16, and a water collection tank 17 located within the tower frame 11. The tower frame 11 is equipped with an air inlet 111 and an air outlet 112. Optionally, [the following is omitted as it is not directly related to the cooling tower body 10]. Figure 6 In this example, the air inlet 111 is located on the side of the tower frame 11, and the air outlet 112 is located on the top of the tower frame 11. This allows the fan 12 to draw in fresh, cold air from the side of the tower frame 11 and discharge it from the top, enabling the cold air to flow upwards through the heat exchange tube bundle 14 and exchange sensible and latent heat with the water sprayed by the spray device 16. This not only enhances the heat release on the outer surface of the heat exchange tube bundle 14 but also removes the water vapor formed by evaporation, accelerating water evaporation and improving the cooling effect. Furthermore, the air inlet 111 can adopt a louvered structure, preventing any water droplets from splashing onto the outside of the tower frame 11. It also effectively prevents direct sunlight, dust, and sandstorms, effectively preventing the growth of algae in the spray water and reducing equipment maintenance costs caused by such problems. Obviously, depending on actual needs, the positions of the air inlet 111 and the air outlet 112 on the tower frame 11 can be other than those specified. Figure 6 The above is the limit.

[0033] The fan 12 is mounted on the tower frame 11, which provides support for the fan 12. The fan 12 also allows outside air to enter through the air inlet 111 and exit through the air outlet 112. Alternatively, as an example, the fan 12 can be selected as an airfoil to have the advantages of high efficiency, low noise, large flow rate and high pressure. In addition, the fan 12 can be equipped with a gearbox, which is equipped with a probe that integrates three parameters: oil temperature, oil level and vibration, to monitor the safe operation of the fan 12.

[0034] The heat exchange tube bundle 14 has an inlet end 141 and an outlet end 142 connected to the pump station 20. The inlet end 141 is connected to the water-using equipment 200 to meet the requirement of the circulating return water from the water-using equipment 200 flowing back to the heat exchange tube bundle 14. Optionally, in... Figure 6In the example shown, the heat exchange tube bundle 14 is a serpentine tube bundle, which allows the heat exchange tube bundle 14 to be arranged at a large angle, thereby preventing the accumulation of foreign matter; obviously, depending on actual needs, the heat exchange tube bundle 14 can also be a tube bundle of other shapes, so it is not considered... Figure 6 The above is the limit.

[0035] The water collector 15 is located above the heat exchange tube bundle 14 to protect the spray device 16 from sunlight and dust contamination. Alternatively, the water collector 15 is made of high-quality PVC material, which has the advantages of corrosion resistance, flame retardancy, high ventilation efficiency and low water drift rate (≤0.01%).

[0036] The spray device 16 is located between the heat exchange tube bundle 14 and the water collector 15 to provide protection for the spray device 16. The water collection tank 17 is located below the corresponding part of the heat exchange tube bundle 14 to collect the water sprayed by the spray device 16. The spray pump 13 transports water from the water collection tank 17 to the spray device 16 to facilitate the circulation of spray water (pure water) between the water collection tank 17 and the spray device 16. Optionally, [the pump 13 is used to transport water from the water collection tank 17 to the spray device 16]. Figure 1 , Figure 4 and Figure 6 As shown, as an example, the spray pump 13 is mounted on the side of the tower frame 11 and adjacent to the bottom of the tower frame 11, but is not limited thereto.

[0037] The pure water treatment system 30 includes a first delivery pump 31 and a filtration unit 32 and a reverse osmosis unit 33 that sequentially perform filtration and reverse osmosis treatment on tap water. The first delivery pump 31 is connected between the filtration unit 32 and the reverse osmosis unit 33, and the reverse osmosis unit 33 is connected to the pump station 20. Therefore, under the operation of the first delivery pump 31, the tap water sequentially passes through the filtration unit 32, the first delivery pump 31, and the reverse osmosis unit 33 before entering the pump station 20. Specifically, in conjunction with... Figure 1 and Figure 5 As an example, the closed-loop circulating water cooling tower 100 of this utility model also includes a cleaning water tank 40 and a cleaning water pump 50 for cleaning the reverse osmosis unit 33. Correspondingly, the reverse osmosis unit 33 is also provided with a cleaning inlet end 331 and a cleaning outlet end 332. Therefore, under the operation of the cleaning water pump 50, the cleaning water circulates between the cleaning water tank 40 and the reverse osmosis unit 33, realizing the function of periodic cleaning of the reverse osmosis unit 33, ensuring the quality of pure water, and extending the service life of the reverse osmosis unit 33. More specifically, as follows:

[0038] Combination Figure 1 and Figure 7As an example, the closed-loop circulating water cooling tower 100 of this invention also includes an electrical control system 70. The electrical control system 70 includes a control cabinet, an operation panel 72, a frequency converter 73, a flow meter 74, a temperature transmitter 75, and a pressure transmitter 76. This design allows the electrical control system 70 to use PLC intelligent control. By monitoring process parameters such as temperature, pressure, and flow rate, it automatically adjusts the frequency of the fan 12 in the closed-loop circulating water cooling tower 100 of this invention, reducing useless power and lowering energy consumption. In addition, it controls the frequency of the external circulation pump 21 (mentioned below) in the pump station 20 by frequency conversion, achieving the purpose of controllable water flow in the closed-loop circulating water cooling tower 100 of this invention. Furthermore, it controls the start and stop of the booster pump 231 (mentioned below) in the pump station 20 to achieve pipe pressure stability in the closed-loop circulating water cooling tower 100 of this invention, and has a remote DCS (distributed control system) function, which can realize remote control in the control room.

[0039] Combination Figures 1 to 3 As an example, the pure water treatment system 30 also includes a pure water storage tank 34 for storing the pure water obtained after treatment by the reverse osmosis unit 33, and a second transfer pump 35 for conveying the pure water in the pure water storage tank 34 to the pump station 20, to ensure the continuous and reliable operation of the closed-loop circulating water cooling tower 100 of this invention. Additionally, the filtration unit 32 includes a dosing tank 321 and a multi-media filter 322, an activated carbon filter 323, and a precision filter 324 connected in sequence. The dosing tank 321 is arranged between the activated carbon filter 323 and the precision filter 324 to effectively improve the quality of tap water treated into pure water. Furthermore, the first transfer pump 31 is a high-pressure pump, which has the advantages of small size and high pressure.

[0040] Combination Figure 1 and Figure 4 As an example, pump station 20 includes an external circulation pump 21, a pure water makeup tank 22, and a pressure stabilizing unit 23. The pressure stabilizing unit 23 is connected to the pure water makeup tank 22 and the external circulation pump 21, which is also connected to the outlet end 142 of the heat exchange tube bundle 14. At this time, the pure water treatment system 30 is used to send treated pure water into the pure water makeup tank 22 so that when the water-using equipment 200 is initially replenished and when water loss is replenished later, the external circulation pump 21 will supply pure water from the pure water makeup tank 22 to the water-using equipment 200. Since the pure water makeup tank 22 is used to collect pure water, it plays a role in buffering and stabilizing the delivery. Specifically, in... Figure 1As an example, a control valve 24 is provided between the pure water replenishment tank 22 and the water collection tank 17 to control the replenishment of pure water in the pure water replenishment tank 22 to the water collection tank 17. By operating the control valve 24, the purpose of replenishing pure water in the water collection tank 17 can be achieved. Optionally, as an example, the control valve 24 is electromagnetically controlled so that the electronic control system 70 can automatically control the control valve 24. Additionally, the pressure stabilizing unit 23 includes a booster pump 231 connected between the pure water replenishment tank 22 and the external circulation pump 21, and a pressure tank 232 connected to the external circulation pump 21. Optionally, as an example, the pressure tank 232 is a diaphragm pressure tank. Therefore, the booster pump 231 pumps out the pure water from the pure water replenishment tank 22 to achieve the initial water replenishment of the water supply equipment 200 and the subsequent replenishment of lost water. In addition, the diaphragm pressure tank is used to regulate the pressure change when the water in the pipeline rises and falls in temperature, reduce the number of times the booster pump 231 starts and stops, and extend its service life.

[0041] like Figure 5 As shown, as an example, a cleaning filter 60 is provided at the outlet end of the cleaning water pump 50 so that the cleaning water pump 50 can be connected to the cleaning inlet end 331 on the reverse osmosis unit 33 through the cleaning filter 60; in addition, a return water end 51 is provided on the cleaning water tank 40 for connecting to the cleaning outlet end 332 on the reverse osmosis unit 33, so as to realize the purpose of cleaning water circulating between the cleaning water tank 50 and the reverse osmosis unit 33 under the drive of the cleaning water pump 50.

[0042] like Figure 6 As shown, as an example, the nozzle 161 of the spray device 16 is a basket-type nozzle, so that the nozzle 161 has the characteristics of large flow rate, uniform spraying, easy cleaning, not easy to clog, easy maintenance and long service life. This allows the water film of the sprayed water to cover the outer wall of the heat exchange tube bundle 14 to the maximum extent, reducing the dry point of the water film on the cooling tube wall, ensuring the cooling area and water vaporization, improving the heat transfer effect, and greatly reducing the scaling rate on the outer wall of the heat exchange tube bundle 14.

[0043] The working principle of the closed-loop circulating water cooling tower 100 of this utility model will be explained with reference to the accompanying drawings:

[0044] In the pure water treatment system 30, tap water is treated by the filtration unit 32 and the reverse osmosis unit 33 to become pure water, which is then stored in the pure water makeup tank 34. The pure water in the pure water makeup tank 34 is then pumped into the pure water makeup tank 22 of the pump station 20 by the second transfer pump 35.

[0045] With the cooperation of the pressure stabilizing unit 23 and the external circulation pump 21, the pure water in the pure water replenishment tank 22 is replenished to the water-using equipment 200 under stable pressure. The circulating return water of the water-using equipment 200 enters the heat exchange tube bundle 14 from the inlet end 141 and then flows back to the external circulation pump 21 from the outlet end 142 of the heat exchange tube bundle 14. The external circulation pump 21 then continues to transport the returned pure water to the water-using equipment 200, so as to achieve the purpose of circulating pure water between the water-using equipment 200 and the cooling tower body 10.

[0046] In the process of circulating return water flowing from the inlet end 141 of the heat exchange tube bundle 14 and then out of the outlet end 142, the spray pump 13 transports pure water from the collection tank 17 to the spray device 16, whereby the spray device 16 sprays the pure water onto the heat exchange tube bundle 14 to achieve heat exchange. Simultaneously, the fan 12 draws in fresh, cold air from the outside through the air inlet 111 and exhausts it through the air outlet 112, achieving air cooling of the heat exchange tube bundle 14. It should be noted that the pure water sprayed onto the heat exchange tube bundle 14 flows back into the collection tank 17 under its own weight. When the pure water loss in the collection tank 17 reaches a predetermined value, the control valve 24 opens, allowing pure water from the pure water replenishment tank 22 to be added to the collection tank 17.

[0047] Compared with existing technologies, the closed-loop circulating water cooling tower 100 of this invention uses a design that includes a first delivery pump 31 and a filter unit 32 and a reverse osmosis unit 33 that sequentially filter and reverse osmosis the tap water, with the first delivery pump 31 connected between the filter unit 32 and the reverse osmosis unit 33, and the reverse osmosis unit 33 connected to the pump station 20. This design ensures high-quality water and stable water supply, reduces the need for scale inhibitors and other chemicals, extends the sewage discharge cycle of the collection tank 17, and reduces operating costs. Furthermore, the use of air cooling and water cooling achieves optimal operating results, resulting in greater energy and water conservation.

[0048] It is worth noting that, depending on actual needs, a raw water tank, a raw water pump, and a backwash water pump can be added to the closed-loop circulating water cooling tower 100 described above. The raw water tank, the raw water pump, the backwash water pump, and the filter unit 32 are arranged in sequence to meet the needs of tap water passing through the raw water tank, the raw water pump, the backwash water pump, and the filter unit 32 in sequence.

[0049] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A closed cycle water cooling tower, comprising a cooling tower body and a pump station, the cooling tower body comprising a tower frame, a fan, a spraying pump and a heat exchange tube bundle, a water collector, a spraying device and a water collecting tank located in the tower frame, the tower frame being provided with an air inlet and an air outlet, the fan being assembled in the tower frame and enabling the outside air to enter from the air inlet and to be discharged from the air outlet, the heat exchange tube bundle having an inlet end and an outlet end in communication with the pump station, the water collector being located above the heat exchange tube bundle, the spraying device being located between the heat exchange tube bundle and the water collector, the water collecting tank being located below the heat exchange tube bundle, the spraying pump enabling the water in the water collecting tank to be delivered to the spraying device, characterized in that, The closed circulation water cooling tower further comprises a pure water treatment system for treating tap water into pure water, the pure water treatment system comprising a first conveying pump and a filtration unit and a reverse osmosis unit for sequentially performing filtration treatment and reverse osmosis treatment on the tap water, the first conveying pump being communicated between the filtration unit and the reverse osmosis unit, and the reverse osmosis unit being communicated with the pump station.

2. The closed cycle water cooling tower of claim 1, wherein, The pump station comprises an external circulation pump, a pure water replenishing tank and a pressure stabilizing unit, the pressure stabilizing unit being communicated between the pure water replenishing tank and the external circulation pump, the external circulation pump being further communicated with an outlet end of the heat exchange tube bundle, and the pure water treatment system being used for sending the treated pure water into the pure water replenishing tank.

3. The closed cycle water cooling tower of claim 2, wherein, A control valve is arranged between the pure water replenishing tank and the water collecting tank for controlling replenishment of pure water in the pure water replenishing tank into the water collecting tank.

4. The closed cycle water cooling tower of claim 2, wherein, The pressure stabilizing unit comprises a booster pump communicated between the pure water replenishing tank and the external circulation pump and an air pressure tank communicated with the external circulation pump.

5. The closed cycle water cooling tower of claim 4 wherein, The air pressure tank is a diaphragm air pressure tank.

6. The closed cycle water cooling tower of claim 1 wherein, The heat exchange tube bundle is a serpentine tube bundle, the air outlet is located at a top of the tower frame body, the air inlet is located at a side of the tower frame body, and the spray head of the spraying device is a basket type spray head.

7. The closed cycle water cooling tower of claim 1 wherein, The pure water treatment system further comprises a pure water storage tank for storing the pure water treated by the reverse osmosis unit and a second conveying pump for conveying the pure water in the pure water storage tank into the pump station.

8. The closed cycle water cooling tower of claim 1 wherein, The filtration unit comprises a dosing tank and a multi-medium filter, an activated carbon filter and a precision filter communicated in sequence, the dosing tank being arranged between the activated carbon filter and the precision filter, and the first conveying pump being a high-pressure pump.

9. The closed cycle water cooling tower of claim 1 wherein, A cleaning water tank and a cleaning water pump for cleaning the reverse osmosis unit are further included, and the reverse osmosis unit is further provided with a cleaning inlet end and a cleaning outlet end.

10. The closed cycle water cooling tower of claim 1 wherein, An electric control system is further included, the electric control system comprising a control cabinet, an operation screen, a frequency converter, a flow meter, a temperature transmitter and a pressure transmitter.

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