Dry air energy cooling water-saving type cooling system

Abstract

The application relates to a dry air energy cooling capacity recycling indirect cooling water-saving type cooling system, which comprises a cooling tower and a cooling capacity recycling device; the cooling tower comprises an evaporative cooling device, the circulating water to be cooled cooled by the evaporative cooling device is led out through a circulating water outlet pipe, a water tank is arranged at the bottom of the evaporative cooling device, and the water tank is communicated with a water storage tank of a precooling circulating cooling device; a second air outlet is arranged at the top of the cooling tower and is internally provided with a second air blower; the cooling capacity recycling device comprises a tower body, an air cooling area and an air inlet area; a first air outlet is arranged above the air cooling area and is internally provided with a first air blower; a plurality of air-water heat exchangers are arranged in the air cooling area, and the air-water heat exchangers are communicated with a circulating water inlet pipe and the evaporative cooling device; a first air inlet is arranged on the side wall of the air inlet area, and a precooling circulating cooling device is arranged at the first air inlet. The application utilizes the blowdown water of the cooling tower to realize external circulating cooling, so that the water evaporation in the cooling tower is reduced, and the purpose of reducing the circulating water consumption is achieved.

Description

Technical Field

[0001] This application relates to a cooling device, and more particularly to an indirect cooling water-saving cooling system that recovers the cooling capacity of dry air. Background Technology

[0002] In industrial projects, cooling circulating water is generally used to remove the heat from the equipment during the production process. The cooling circulating water eventually releases the heat to the outdoor environment through a cooling tower. The cooling tower dissipates heat by releasing heat into the atmosphere with water mist through the evaporation of water. In this process, a large amount of liquid water turns into gaseous water, which is then discharged directly outdoors. Therefore, the cooling tower consumes water during the heat dissipation process.

[0003] While cooling water evaporates, calcium and magnesium ions remain in the water. Therefore, as the amount of water evaporated increases, the concentration ratio of the water also increases. Typically, the concentration ratio of industrial cooling circulating water needs to be controlled between 3 and 5. When the concentration ratio of water increases, calcium and magnesium ions in the water are more likely to precipitate out, which can easily lead to scaling problems in pipes or heat exchangers, affecting process heat exchange and consequently affecting production efficiency.

[0004] To control the concentration ratio of circulating water, the current measure is to reduce the concentration ratio by discharging wastewater and then injecting fresh water. Depending on the concentration ratio being controlled, the amount of wastewater discharged will vary. Typically, the amount of wastewater discharged accounts for 15-20% of the total cooling circulating water consumption, and water will also be consumed in the process.

[0005] Therefore, if the amount of water evaporation during cooling tower heat dissipation can be reduced, the increase in water concentration ratio can be slowed down, which can reduce the frequency of sewage discharge and water replenishment, thereby reducing the circulating water consumption. Summary of the Invention

[0006] The purpose of this application is to propose an indirect cooling water-saving cooling system that utilizes the wastewater discharged from the cooling tower for external cooling, thereby reducing the evaporation of water inside the cooling tower and ultimately reducing the circulating water consumption.

[0007] This application is implemented as follows: a dry air energy recovery indirect cooling water-saving cooling system, including a cooling tower and a cold energy recovery device; The cooling tower includes an evaporative cooling device. The circulating water to be cooled by the evaporative cooling device is led out through the circulating water outlet pipe. A water tank is installed at the bottom of the evaporative cooling device, and the water tank is connected to the water storage tank of the pre-cooling circulating cooling device. A second exhaust vent is opened at the top of the cooling tower, and a second exhaust fan is installed inside the second exhaust vent. The cold energy recovery device includes a hollow tower body, which is divided into an upper air-cooling zone and a lower air-inlet zone. The top of the shell above the air-cooled area has a first air vent, and a first air fan is installed inside the first air vent. Several air-water heat exchangers are installed in the air-cooled area below the first air vent. The water inlet of each air-water heat exchanger is connected to the circulating water inlet pipe, and the water outlet of each air-water heat exchanger is connected to the air-cooled water outlet main pipe. The air-cooled water outlet main pipe is connected to the water inlet of the evaporative cooling device. At least one first air inlet is provided on the side wall of the air intake area, and a pre-cooling circulation cooling device is provided at the first air inlet to reduce the temperature of the air entering the air intake area.

[0008] The pre-cooling circulating cooling device includes a water distribution device located above the first air inlet or above the air inlet area, a water storage tank at the bottom, a pre-cooling circulating water inlet at the bottom of the water storage tank, the pre-cooling circulating water inlet being connected to the water inlet of the first circulating pump, the water outlet of the first circulating pump being connected to the water inlet of the water distribution device, and the upper surface of the water storage tank being open.

[0009] A sewage pump is installed between the water tank and the storage tank. A sewage outlet is opened at the bottom of the water tank, and a water inlet is opened on the upper side wall of the storage tank. The water inlet of the sewage pump is connected to the sewage outlet, and the water outlet of the sewage pump is connected to the water inlet.

[0010] A drain outlet is provided at the bottom of the water tank, and a water inlet is provided on the upper side wall of the water tank. The bottom of the water tank is higher than the top of the water tank. The drain outlet and the water inlet are connected by a pipeline, and a valve is installed on the pipeline.

[0011] A pre-cooling evaporation packing is installed between the water distribution device and the water storage tank.

[0012] An opening is provided on the side wall of the air intake area, and an adjustable damper is installed inside the opening.

[0013] The precooling circulation cooling device includes a water distribution device located at the top of the air inlet area and a water storage tank at the bottom. A V-shaped or continuous V-shaped arrangement of precooling evaporation packing is provided between the water distribution device and the water storage tank. An opening is provided between the precooling evaporation packing, and an adjustable damper is installed in the opening.

[0014] An overflow pipe and a drain pipe are connected in parallel at the bottom of the water storage tank. A control valve is installed on the drain pipe. The lower outlet of the overflow pipe is connected to the lower outlet of the drain pipe. The upper part of the overflow pipe extends into the water storage tank.

[0015] The air-water heat exchanger includes a shell, with two opposite side walls of the shell being closed. An air inlet and an air outlet are respectively opened on the other opposite side walls. A heat exchange tube is installed inside the shell between the air inlet and the air outlet, and fins are installed on the outer wall of the heat exchange tube. The water inlet end of the heat exchange tube is connected to the circulating water inlet pipe, and the water outlet end of the heat exchange tube is connected to the air-cooled water outlet main pipe.

[0016] Several air-water heat exchangers are arranged in a V-shape or continuous V-shape. The air inlet and outlet of each air-water heat exchanger are arranged on the left and right sides. The upper or lower ends of the shells of two adjacent air-water heat exchangers are sealed together. The upper or lower end of the shell of the leftmost air-water heat exchanger is sealed together with the side wall of the tower body of the air-cooled area. The upper or lower end of the shell of the rightmost air-water heat exchanger is sealed together with the side wall of the tower body opposite the air-cooled area. The closed ends of the shells are sealed together with the side walls of the tower body on the other sides of the air-cooled area.

[0017] The evaporative cooling device includes an internal spray pipe located inside the cooling tower. The water inlet of the internal spray pipe is connected to the water outlet of the air-cooled water outlet main pipe. Evaporative packing is installed below the internal spray pipe. Several second air inlets are opened on the side wall of the cooling tower below the evaporative packing. A water tank is installed inside the tower body below the second air inlets. The upper end of the water tank is open. A water supply pipe and a circulating water outlet pipe are installed on the water tank.

[0018] The evaporative cooling device includes a second circulating pump, a tower spray pipe located inside the cooling tower, a heat exchange coil installed below the tower spray pipe, several second air inlets opened on the side wall of the cooling tower below the heat exchange coil, a water tank installed inside the tower body below the second air inlets, the upper end of the water tank being open, a water supply pipe installed on the water tank, the water tank being connected to the water inlet of the second circulating pump, the water outlet of the second circulating pump being connected to the water inlet of the tower spray pipe, the water inlet of the heat exchange coil being connected to the air-cooled water outlet main pipe, and the water outlet of the heat exchange coil being connected to the circulating water outlet pipe.

[0019] The evaporative cooling device includes a second circulating pump, an internal spray pipe located inside the cooling tower, evaporative packing material below the internal spray pipe, several second air inlets on the side wall of the cooling tower below the evaporative packing material, a water tank inside the tower body below the second air inlets, an open upper surface of the water tank, a water supply pipe on the water tank, the water tank being connected to the inlet of the second circulating pump, the outlet of the second circulating pump being connected to the primary side inlet of the plate heat exchanger, the primary side outlet of the plate heat exchanger being connected to the inlet of the internal spray pipe, the secondary side inlet of the plate heat exchanger being connected to the air-cooled water outlet main pipe, and the secondary side outlet of the plate heat exchanger being connected to the circulating water outlet pipe.

[0020] The lower part of the cooling tower has several second air inlets on its side wall. An evaporative cooling device is installed in each second air inlet. The evaporative cooling device includes evaporative packing. A water tank is installed on the lower side of the evaporative packing, and a water distribution box is installed on the upper side. The water inlet of the water distribution box is connected to the water outlet of the air-cooled water outlet main pipe. The upper end of the water tank is open, and a water supply pipe and a circulating water outlet pipe are installed on the water tank.

[0021] The lower part of the cooling tower has several second air inlets on its side wall. An evaporative cooling device is installed in each second air inlet. The evaporative cooling device includes a second circulating pump and a heat exchange coil. A water tank is installed on the lower side of the heat exchange coil, and a water distribution box is installed on the upper side. The upper end of the water tank is open, and a water supply pipe is installed on the water tank. The water tank is connected to the inlet of the second circulating pump, and the outlet of the second circulating pump is connected to the inlet of the water distribution box. The inlet of the heat exchange coil is connected to the main air-cooled water outlet pipe, and the outlet of the heat exchange coil is connected to the circulating water outlet pipe.

[0022] The lower part of the cooling tower has several second air inlets on its side wall. An evaporative cooling device is installed inside each second air inlet. The evaporative cooling device includes a second circulating pump and evaporative packing. A water tank is installed on the lower side of the evaporative packing, and a water distribution box is installed on the upper side. The upper end of the water tank is open, and a water supply pipe is installed on the water tank. The water tank is connected to the inlet of the second circulating pump. The outlet of the second circulating pump is connected to the primary side inlet of the plate heat exchanger. The primary side outlet of the plate heat exchanger is connected to the inlet of the water distribution box. The secondary side inlet of the plate heat exchanger is connected to the air-cooled water outlet main pipe. The secondary side outlet of the plate heat exchanger is connected to the circulating water outlet pipe.

[0023] By implementing the above technical solution, this application uses a pre-cooling circulating cooling device to guide the wastewater from the cooling tower to the first air inlet of the cold energy recovery device to cool the incoming air. This results in a lower air temperature passing through the air-water heat exchanger, significantly reducing the temperature of the circulating water. Consequently, the temperature of the circulating water entering the cooling tower is lower, which helps reduce evaporation and slows down the increase in water concentration. This, in turn, reduces the frequency of wastewater discharge and water replenishment, ultimately reducing the circulating water consumption. Simultaneously, the lower the air temperature passing through the air-water heat exchanger, the lower the speed of the first exhaust fan can be, thereby reducing energy consumption and extending the scaling cycle on the air-water heat exchanger surface. Attached Figure Description

[0024] The specific structure of this application is given by the following figures and embodiments: Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural schematic diagram of the present application equipped with an adjustable damper; Figure 3 This is a structural schematic diagram of the present application showing a pre-cooling circulating cooling device installed in the air-cooled area; Figure 4 This is a structural schematic diagram of the evaporative cooling device of this application, which consists of spray pipes and evaporative packing. Figure 5 This is a structural schematic diagram of the present application, showing that the evaporative cooling device consists of spray pipes and heat exchange coils; Figure 6This is a structural schematic diagram of the present application when the evaporative cooling device consists of spray pipes and evaporative packing, and a plate heat exchanger is added. Figure 7 This is a structural schematic diagram of the present application, showing that the evaporative cooling device consists of a water distribution box and evaporative packing. Figure 8 This is a schematic diagram of the evaporative cooling device, which consists of a water distribution box and heat exchange coils. Figure 9 This is a schematic diagram of a plate heat exchanger installed in an evaporative cooling device consisting of a water distribution box and evaporative packing. Figure 10 This is a schematic diagram of an air-water heat exchanger.

[0025] Legend: 1. First exhaust vent, 2. Cooling recovery device, 3. Circulating water inlet pipe, 4. Water distribution device, 5. Pre-cooling evaporation packing, 6. First air inlet, 7. Water storage tank, 8. Drain pipe, 9. Pre-cooling circulating water pipe, 10. First circulating pump, 11. Sewage pipe, 12. Sewage pump, 13. Water supply pipe, 14. Circulating water outlet pipe, 15. Evaporative cooling device, 16. Cooling tower, 17. Air-cooled main outlet pipe, 18. Air-water heat exchanger 18-1. Water inlet, 18-2. Water distribution chamber, 18-3. Shell, 18-4. Water collection chamber, 18-5. Fins, 18-6. Heat exchange tubes, 18-7. Air inlet, 19. Shell, 20. Water tank, 21. Adjustable damper, 22. Second air inlet, 23. Evaporation packing, 24. Second exhaust outlet, 25. Spray pipe inside the tower, 26. Plate heat exchanger, 27. Second circulating pump, 28. Heat exchange coil, 29. Water distribution box. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Example: Figure 1-6As shown, an indirect cooling water-saving cooling system for recovering dry air energy includes a cooling tower 16 and a cold energy recovery device 2. Cooling tower 16 includes an evaporative cooling device 15. The circulating water to be cooled by the evaporative cooling device 15 is led out by the circulating water outlet pipe 14. A water tank 20 is set at the bottom of the evaporative cooling device 15. The water tank 20 is connected to the water storage tank 7 of the pre-cooling circulating cooling device. A second exhaust vent 24 is opened at the top of the cooling tower 16. A second exhaust fan is installed in the second exhaust vent 24. The cold energy recovery device 2 includes a hollow tower body, which is divided into an upper air-cooling area and a lower air-inlet area. A first exhaust vent 1 is opened on the top of the shell above the air-cooled area. A first exhaust fan is installed inside the first exhaust vent 1. Several air-water heat exchangers 18 are installed in the air-cooled area below the first exhaust vent 1. The water inlet of each air-water heat exchanger 18 is connected to the circulating water inlet pipe 3, and the water outlet of each air-water heat exchanger 18 is connected to the air-cooled water outlet main pipe 17. The air-cooled water outlet main pipe 17 is connected to the water inlet of the evaporative cooling device 15. At least one first air inlet 6 is provided on the side wall of the air intake area, and a pre-cooling circulation cooling device is provided at the first air inlet 6 to reduce the temperature of the air entering the air intake area.

[0029] There are two ways to connect water tank 20 to the water storage tank 7 of the pre-cooling circulating cooling device: One method is to install a sewage pump 12 between the water tank 20 and the water storage tank 7. The bottom of the water tank 20 has a sewage outlet, and the upper side wall of the water storage tank 7 has a water inlet. The water inlet of the sewage pump 12 is connected to the sewage outlet, and the water outlet of the sewage pump 12 is connected to the water inlet. The sewage pump 12 can pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. Another method involves having a drain outlet at the bottom of water tank 20 and an inlet on the upper side wall of water storage tank 7. The bottom of water tank 20 is higher than the top of water storage tank 7. The drain outlet and the inlet are connected by a pipeline with a valve installed on the pipeline. The height difference between water tank 20 and water storage tank 7 forms a high-low liquid level connector. After the valve is opened, the wastewater in water tank 20 flows naturally into water storage tank 7 as pre-cooling spray water.

[0030] In the prior art, the water discharged from the sewage pump 12 or the sewage outlet in the water tank 20 is directly discharged as sewage. In this application, the sewage is diverted to the water storage tank 7 as pre-cooling spray water to cool the air entering the cold energy recovery device 2, thereby making full use of the sewage to form cold energy recovery.

[0031] The pre-cooling circulating cooling device includes a water distribution device 4 located above the first air inlet 6 or above the air intake area, and a lower water storage tank 7. The upper end of the water storage tank 7 is open, and a pre-cooling circulating water inlet is provided at the bottom of the water storage tank 7. The pre-cooling circulating water inlet is connected to the water inlet of the first circulating pump 10, and the water outlet of the first circulating pump 10 is connected to the water inlet of the water distribution device 4. After starting the first circulating pump 10, the pre-cooling circulating water in the water storage tank 7 can be pumped into the water distribution device 4. The water distribution device 4 distributes the water into the water storage tank 7 to form a water curtain, and the air entering the first air inlet 6 is cooled when passing through the water curtain. The pre-cooling circulating water distributed to the water storage tank 7 by the water distribution device 4 flows back into the water storage tank 7 through the open end of the upper end of the water storage tank 7.

[0032] Furthermore, a pre-cooling evaporation packing 5 is installed between the water distribution device 4 and the water storage tank 7. After starting the first circulation pump 10, the pre-cooling circulating water in the water storage tank 7 can be pumped into the water distribution device 4, and then distributed to the pre-cooling evaporation packing 5. The air entering the first air inlet 6 is cooled when passing through the pre-cooling evaporation packing 5. The upper end of the water storage tank 7 is open, and the pre-cooling circulating water that has passed through the pre-cooling evaporation packing 5 flows back into the water storage tank 7 through the open end of the water storage tank 7.

[0033] like Figure 3 As shown, the pre-cooling circulating cooling device includes a water distribution device 4 located above the air inlet area, and a water storage tank 7 located below. The upper surface of the water storage tank 7 is open, and a pre-cooling circulating water inlet is provided at the bottom of the water storage tank 7. The pre-cooling circulating water inlet is connected to the water inlet of the first circulating pump 10, and the water outlet of the first circulating pump 10 is connected to the water inlet of the water distribution device 4. A V-shaped or continuous V-shaped pre-cooling evaporation packing 5 is arranged between the water distribution device 4 and the water storage tank 7. An opening is provided between the pre-cooling evaporation packing 5, and an adjustable damper 21 is installed in the opening.

[0034] The water distribution device 4 can be a spray pipe or a water distribution box.

[0035] Furthermore, a parallel overflow pipe and a drain pipe 8 are installed at the bottom of the water storage tank 7. A control valve is installed on the drain pipe 8. The lower outlet of the overflow pipe is connected to the lower outlet of the drain pipe 8, and the upper part of the overflow pipe extends into the water storage tank 7. The drain pipe 8 is used to drain the pre-cooling spray water in the water storage tank 7, and the overflow pipe can control the water level in the water storage tank 7.

[0036] Furthermore, the outlet of the sewage pump 12 is connected to the sewage pipe 11, and the sewage pipe 11 is connected to the upper inlet of the water storage tank 7. When there are multiple water storage tanks 7, the sewage pipe 11 is divided into multiple branch lines and connected to the inlet of each water storage tank 7 respectively.

[0037] like Figure 9As shown, the air-water heat exchanger 18 includes a shell 18-3, with any two opposite side walls of the shell 18-3 being closed. An air inlet 18-7 and an air outlet are respectively provided on the other two opposite side walls. A heat exchange tube 18-6 is arranged inside the shell 18-3 between the air inlet 18-7 and the air outlet. Several fins 18-5 for increasing the heat exchange area are arranged on the outer wall of the heat exchange tube 18-6. The water inlet end of the heat exchange tube 18-6 is connected to the circulating water inlet pipe 3, and the water outlet end of the heat exchange tube 18-6 is connected to the air-cooled water outlet main pipe 17.

[0038] Furthermore, a water distribution chamber 18-2 is provided above the shell 18-3, and a water collection chamber 18-4 is provided below the shell 18-3. The bottom surface of the water distribution chamber 18-2 has several openings that correspond one-to-one with the heat exchange tubes 18-6. The upper end of the heat exchange tubes 18-6 is connected to the openings, and the lower end of the heat exchange tubes 18-6 is connected to the water collection chamber 18-4. The water inlet of the water distribution chamber 18-2 is connected to the circulating water inlet pipe 3, and the water outlet of the water collection chamber 18-4 is connected to the air-cooled water outlet main pipe 17.

[0039] Furthermore, several air-water heat exchangers 18 are arranged in a V-shape or a continuous V-shape. The air inlet 18-7 and air outlet of each air-water heat exchanger 18 are arranged on the left and right sides. The upper or lower ends of the shells 18-3 of adjacent air-water heat exchangers 18 are sealed together. The upper or lower end of the shell 18-3 of the leftmost air-water heat exchanger 18 is sealed together with the side wall of the tower body of the air-cooled area. The upper or lower end of the shell 18-3 of the rightmost air-water heat exchanger 18 is sealed together with the side wall of the tower body opposite the air-cooled area. The closed ends of the shells 18-3 are sealed together with the side walls of the tower body on the other sides of the air-cooled area.

[0040] This structure requires the airflow entering the air-cooled area to pass through the heat exchange tubes 18-6 inside the air-water heat exchanger 18 for heat exchange. When heat exchange is not required by the air-water heat exchanger 18, the first row of fans can be stopped.

[0041] like Figure 2 As shown, an opening is provided on the side wall of the air inlet area, and an adjustable damper 21 is installed in the opening. The adjustable damper 21 is an electric louver. The opening size can be adjusted by rotating the blades of the electric louver, thereby controlling the air volume entering the tower body of the cold energy recovery device 2. The specific structure and control method of the electric louver are existing technologies and are not the point of this invention, so they will not be described in detail here. For example, the electric louver produced by Jingjiang Fodong Air Conditioning Equipment Factory.

[0042] like Figure 3As shown in Embodiment 1, the evaporative cooling device 15 includes an internal spray pipe 25 located inside the cooling tower 16. The inlet end of the internal spray pipe 25 is connected to the outlet end of the air-cooled water outlet main pipe 17. An evaporative packing 23 is installed below the internal spray pipe 25. Several second air inlets 22 are opened on the side wall of the cooling tower 16 below the evaporative packing 23. A water tank 20 is installed inside the tower body below the second air inlets 22. The upper end face of the water tank 20 is open. Water passing through the evaporative packing 23 flows into the water tank 20 from the open end face of the water tank 20. A water supply pipe 13 and a circulating water outlet pipe 14 are installed on the water tank 20.

[0043] First, the sewage pump 12 is started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. Once the circulating liquid level is reached, the sewage pump 12 is stopped. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative cooling. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0044] The circulating water to be cooled can then be introduced into the heat exchange tubes 18-6 of the air-water heat exchanger 18 through the circulating water inlet pipe 3. After exchanging heat with the flowing air, the circulating water flows into the spray pipe 25 inside the tower through the air-cooled outlet pipe 17. The spray pipe 25 sprays the water onto the evaporation packing 23 to form evaporative cooling. The cooled circulating water then enters the water tank 20 and is finally led out through the circulating water outlet pipe 14. When it is necessary to adjust the concentration ratio of the circulating water to be cooled, the circulating water flowing into the water tank 20 can be diverted to the storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the circulating water to be cooled.

[0045] like Figure 4 As shown in Embodiment 2, the evaporative cooling device 15 includes a second circulating pump 27 and a tower spray pipe 25 located inside the cooling tower 16. A heat exchange coil 28 is installed below the tower spray pipe 25. Several second air inlets 22 are opened on the side wall of the cooling tower 16 below the heat exchange coil 28. A water tank 20 is installed inside the tower body below the second air inlets 22. The upper end face of the water tank 20 is open. Water passing through the heat exchange coil 28 flows into the water tank 20 from the open upper end face of the water tank 20. A water supply pipe 13 is installed on the water tank 20. The water tank 20 is connected to the water inlet of the second circulating pump 27. The water outlet of the second circulating pump 27 is connected to the water inlet of the tower spray pipe 25. The water inlet of the heat exchange coil 28 is connected to the air-cooled water outlet main pipe 17. The water outlet of the heat exchange coil 28 is connected to the circulating water outlet pipe 14. In this method, the water in the water tank 20 is circulated through the second circulation pump 27 and used as spray water in the cooling tower 16. The spray water will have evaporation loss, and its concentration ratio will gradually increase with evaporation.

[0046] First, the sewage pump 12 is started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. Once the circulating liquid level is reached, the sewage pump 12 is stopped. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative cooling. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0047] The circulating water to be cooled can then be introduced into the heat exchange tubes 18-6 of the air-water heat exchanger 18 through the circulating water inlet pipe 3. After heat exchange with the flowing air, the circulating water flows into the heat exchange coil 28 through the air-cooled water outlet main pipe 17, and is sprayed onto the heat exchange coil 28 through the spray pipe 25 inside the tower to form evaporative cooling. The circulating water to be cooled after heat exchange is led out through the circulating water outlet pipe 14. When it is necessary to adjust the concentration ratio of the spray water in the cooling tower 16, the spray water flowing into the water tank 20 can be diverted to the water storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the spray water.

[0048] like Figure 5 As shown in Embodiment 3, the evaporative cooling device 15 includes a second circulating pump 27 and an internal spray pipe 25 located inside the cooling tower 16. Evaporative packing 23 is installed below the internal spray pipe 25. Several second air inlets 22 are opened on the side wall of the cooling tower 16 below the evaporative packing 23. A water tank 20 is installed inside the tower body below the second air inlets 22. The upper end of the water tank 20 is open, and water passing through the evaporative packing 23 flows into the water tank 20 through the open upper end of the water tank 20. Inside the cooling tower 16, a water tank 20 is equipped with a water supply pipe 13. The water tank 20 is connected to the inlet of the second circulating pump 27, the outlet of the second circulating pump 27 is connected to the primary side inlet of the plate heat exchanger 26, the primary side outlet of the plate heat exchanger 26 is connected to the inlet of the spray pipe 25 inside the tower, the secondary side inlet of the plate heat exchanger 26 is connected to the air-cooled water outlet main pipe 17, and the secondary side outlet of the plate heat exchanger 26 is connected to the circulating water outlet pipe 14. In this way, the water in the water tank 20 is circulated through the second circulating pump 27 as spray water in the cooling tower 16. The spray water will have evaporation losses, and its concentration ratio will gradually increase with evaporation.

[0049] In this embodiment, the sewage pump 12 is first started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. The sewage pump 12 is stopped after the water reaches the recirculating level. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative heat exchange. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0050] The circulating water to be cooled enters the cold energy recovery device 2 through the circulating water inlet pipe 3 for heat exchange and cooling. After cooling, it enters the secondary side inlet of the plate heat exchanger 26 through the air-cooled outlet main pipe 17. After heat exchange, it flows out through the secondary side outlet and the circulating water outlet pipe 14. The second circulation pump 27 pumps water from the water tank 20 into the primary side inlet of the plate heat exchanger 26. After heat exchange with the circulating water to be cooled, it flows from the primary side outlet to the spray pipe 25 inside the tower for spraying. The sprayed water flows back into the water tank 20. When it is necessary to adjust the concentration ratio of the spray water in the cooling tower 16, the spray water flowing into the water tank 20 can be diverted to the water storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the spray water.

[0051] like Figure 6 As shown in Embodiment 4, the lower tower body sidewall of the cooling tower 16 has several second air inlets 22. An evaporative cooling device 15 is installed in the second air inlet 22. The evaporative cooling device 15 includes evaporative packing 23. A water tank 20 is installed on the lower side of the evaporative packing 23, and a water distribution box 29 is installed on the upper side. The water inlet of the water distribution box 29 is connected to the water outlet of the air-cooled water outlet main pipe 17. The upper end of the water tank 20 is open. Water passing through the evaporative packing 23 flows into the water tank 20 from the open upper end of the water tank 20. A water supply pipe 13 and a circulating water outlet pipe 14 are installed on the water tank 20.

[0052] First, the sewage pump 12 is started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. Once the circulating liquid level is reached, the sewage pump 12 is stopped. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative cooling. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0053] The circulating water to be cooled can then be introduced into the heat exchange tubes 18-6 of the air-water heat exchanger 18 through the circulating water inlet pipe 3. After exchanging heat with the flowing air, the circulating water flows into the water distribution box 29 through the air-cooled outlet main pipe 17. The water distribution box 29 sprays the water onto the evaporation packing 23 to form evaporative cooling. The cooled circulating water then enters the water tank 20 and is finally led out through the circulating water outlet pipe 14. When it is necessary to adjust the concentration ratio of the circulating water to be cooled, the circulating water flowing into the water tank 20 can be diverted to the water storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the circulating water to be cooled.

[0054] like Figure 7 As shown in Embodiment 5, the lower tower body sidewall of the cooling tower 16 has several second air inlets 22. An evaporative cooling device 15 is installed inside the second air inlet 22. The evaporative cooling device 15 includes a second circulating pump 27 and a heat exchange coil 28. A water tank 20 is installed on the lower side of the heat exchange coil 28, and a water distribution box 29 is installed on the upper side. The upper end face of the water tank 20 is open. Water passing through the heat exchange coil 28 flows into the water tank 20 from the open end face of the water tank 20. A water supply pipe 13 is installed on the water tank 20. The water tank 20 is connected to the water inlet of the second circulating pump 27. The water outlet of the second circulating pump 27 is connected to the water inlet of the water distribution box 29. The water inlet of the heat exchange coil 28 is connected to the air-cooled water outlet main pipe 17. The water outlet of the heat exchange coil 28 is connected to the circulating water outlet pipe 14. In this method, the water in the water tank 20 is circulated through the second circulation pump 27 and used as spray water in the cooling tower 16. The spray water will have evaporation loss, and its concentration ratio will gradually increase with evaporation.

[0055] First, the sewage pump 12 is started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. Once the circulating liquid level is reached, the sewage pump 12 is stopped. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative cooling. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0056] The circulating water to be cooled can then be introduced into the heat exchange tubes 18-6 of the air-water heat exchanger 18 through the circulating water inlet pipe 3. After heat exchange with the flowing air, the circulating water flows into the heat exchange coil 28 through the air-cooled outlet main pipe 17, and is distributed to the heat exchange coil 28 through the water distribution box 29 to form evaporative cooling. The circulating water to be cooled after heat exchange is led out through the circulating water outlet pipe 14. When it is necessary to adjust the concentration ratio of the spray water in the cooling tower 16, the spray water flowing into the water tank 20 can be diverted to the water storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the spray water.

[0057] like Figure 8 As shown in Embodiment 6, the lower side wall of the cooling tower 16 has several second air inlets 22. An evaporative cooling device 15 is installed inside the second air inlet 22. The evaporative cooling device 15 includes a second circulating pump 27 and evaporative packing 23. A water tank 20 is installed on the lower side of the evaporative packing 23, and a water distribution box 29 is installed on the upper side. The upper end of the water tank 20 is open. Water passing through the heat exchange coil 28 flows into the water tank 20 from the open end of the upper end of the water tank 20. A water supply pipe 13 is installed on the water tank 20. The water tank 20 is connected to the inlet of the second circulating pump 27. The outlet of the second circulating pump 27 is connected to the primary side inlet of the plate heat exchanger 26. The primary side outlet of the plate heat exchanger 26 is connected to the inlet of the water distribution box 29. The secondary side inlet of the plate heat exchanger 26 is connected to the air-cooled water outlet main pipe 17. The secondary side outlet of the plate heat exchanger 26 is connected to the circulating water outlet pipe 14. In this method, the water in the water tank 20 is circulated through the second circulation pump 27 and used as spray water in the cooling tower 16. The spray water will have evaporation loss, and its concentration ratio will gradually increase with evaporation.

[0058] In this embodiment, the sewage pump 12 is first started to pump water from the water tank 20 into the water storage tank 7 as pre-cooling spray water. The sewage pump 12 is stopped after the water reaches the recirculating level. Then, the first circulation pump 10 is started to pump the pre-cooling spray water from the water storage tank 7 into the water distribution device 4. The water is then distributed to the pre-cooling evaporation packing 5 via the water distribution device 4, forming evaporative heat exchange. The air is cooled as it passes through the pre-cooling evaporation packing 5, and then exchanges heat with the circulating water to be cooled when it passes through the air-water heat exchanger 18. Finally, the air is discharged from the first exhaust port 1. The water distribution device 4 is a spray pipe.

[0059] The circulating water to be cooled enters the cold energy recovery device 2 through the circulating water inlet pipe 3 for heat exchange and cooling. After cooling, it enters the secondary side inlet of the plate heat exchanger 26 through the air-cooled outlet main pipe 17. After heat exchange, it flows out through the secondary side outlet and the circulating water outlet pipe 14. The second circulation pump 27 pumps water from the water tank 20 into the primary side inlet of the plate heat exchanger 26. After heat exchange with the circulating water to be cooled, it flows from the primary side outlet to the spray pipe 25 inside the tower for spraying. The sprayed water flows back into the water tank 20. When it is necessary to adjust the concentration ratio of the spray water in the cooling tower 16, the spray water flowing into the water tank 20 can be diverted to the water storage tank 7 and discharged through the drain pipe 8. Then, new water can be added to the water tank 20 through the water replenishment pipe 13, thereby reducing the concentration ratio of the spray water.

[0060] The above technical features constitute the embodiments of this application, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A dry air energy recovery indirect cooling water-saving cooling system, characterized in that: Includes a cooling tower (16) and a cold energy recovery device (2); The cooling tower (16) includes an evaporative cooling device (15). The circulating water to be cooled by the evaporative cooling device (15) is led out by the circulating water outlet pipe (14). A water tank (20) is set at the bottom of the evaporative cooling device (15). The water tank (20) is connected to the water storage tank (7) of the pre-cooling circulating cooling device. A second exhaust vent (24) is opened at the top of the cooling tower (16). A second exhaust fan is installed in the second exhaust vent (24). The cold energy recovery device (2) includes a hollow tower body, which is divided into an upper air-cooling area and a lower air-inlet area. The top of the shell above the air-cooled area is provided with a first exhaust vent (1), and a first exhaust fan is installed inside the first exhaust vent (1). Several air-water heat exchangers (18) are installed in the air-cooled area below the first exhaust vent (1). The water inlet of each air-water heat exchanger (18) is connected to the circulating water inlet pipe (3), and the water outlet of each air-water heat exchanger (18) is connected to the air-cooled water outlet main pipe (17). The air-cooled water outlet main pipe (17) is connected to the water inlet of the evaporative cooling device (15). At least one first air inlet (6) is provided on the side wall of the air inlet area, and a pre-cooling circulation cooling device is provided at the first air inlet (6) to reduce the temperature of the air entering the air inlet area.

2. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 1, characterized in that: The pre-cooling circulating cooling device includes a water distribution device (4) located above the first air inlet (6) or above the air inlet area, and a water storage tank (7) at the bottom. The bottom of the water storage tank (7) is provided with a pre-cooling circulating water inlet, which is connected to the water inlet of the first circulating pump (10). The water outlet of the first circulating pump (10) is connected to the water inlet of the water distribution device (4), and the upper surface of the water storage tank (7) is open.

3. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 2, characterized in that: A sewage pump (12) is installed between the water tank (20) and the water storage tank (7). A sewage outlet is opened at the bottom of the water tank (20), and a water inlet is opened on the upper side wall of the water storage tank (7). The water inlet of the sewage pump (12) is connected to the sewage outlet, and the water outlet of the sewage pump (12) is connected to the water inlet.

4. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 2, characterized in that: A drain outlet is provided at the bottom of the water tank (20), and an inlet is provided on the upper side wall of the water storage tank (7). The bottom of the water tank (20) is higher than the upper part of the water storage tank (7). The drain outlet and the inlet are connected by a pipeline, and a valve is installed on the pipeline.

5. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 2, characterized in that: A pre-cooling evaporation packing (5) is installed between the water distribution device (4) and the water storage tank (7).

6. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 5, characterized in that: An opening is provided on the side wall of the air intake area, and an adjustable damper (21) is installed in the opening.

7. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 6, characterized in that: The precooling circulation cooling device includes a water distribution device (4) located at the top of the air inlet area and a water storage tank (7) at the bottom. A V-shaped or continuous V-shaped precooling evaporation packing (5) is arranged between the water distribution device (4) and the water storage tank (7). An opening is provided between the precooling evaporation packing (5), and an adjustable damper (21) is installed in the opening.

8. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: An overflow pipe and a drain pipe (8) are connected in parallel at the bottom of the water storage tank (7). A control valve is installed on the drain pipe (8). The lower outlet of the overflow pipe is connected to the lower outlet of the drain pipe (8). The upper part of the overflow pipe extends into the water storage tank (7).

9. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The air-water heat exchanger (18) includes a shell (18-3), with any two opposite side walls of the shell (18-3) being closed. An air inlet (18-7) and an air outlet are respectively opened on the other two opposite side walls. A heat exchange tube (18-6) is installed in the shell (18-3) between the air inlet (18-7) and the air outlet. Fins (18-5) are installed on the outer wall of the heat exchange tube (18-6). The water inlet end of the heat exchange tube (18-6) is connected to the circulating water inlet pipe (3), and the water outlet end of the heat exchange tube (18-6) is connected to the air-cooled water outlet main pipe (17).

10. The indirect cooling and water-saving cooling system for dry air energy recovery as described in claim 9, characterized in that: Several air-water heat exchangers (18) are arranged in a V-shape or a continuous V-shape. The air inlet (18-7) and air outlet of each air-water heat exchanger (18) are arranged on the left and right. The upper or lower ends of the shells (18-3) of two adjacent air-water heat exchangers (18) are sealed together. The upper or lower end of the shell (18-3) of the leftmost air-water heat exchanger (18) is sealed together with the side wall of the tower in the air-cooled area. The upper or lower end of the shell (18-3) of the rightmost air-water heat exchanger (18) is sealed together with the side wall of the tower opposite the air-cooled area. The closed end of the shell (18-3) is sealed together with the side wall of the tower on the other side of the air-cooled area.

11. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The evaporative cooling device (15) includes an in-tower spray pipe (25) located in the cooling tower (16). The inlet end of the in-tower spray pipe (25) is connected to the outlet end of the air-cooled water outlet main pipe (17). An evaporative packing (23) is installed below the in-tower spray pipe (25). Several second air inlets (22) are opened on the side wall of the cooling tower (16) below the evaporative packing (23). A water tank (20) is installed in the tower body below the second air inlets (22). The upper end face of the water tank (20) is open. A water supply pipe (13) and a circulating water outlet pipe (14) are installed on the water tank (20).

12. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The evaporative cooling device (15) includes a second circulating pump (27) and a tower spray pipe (25) located inside the cooling tower (16). A heat exchange coil (28) is installed below the tower spray pipe (25). Several second air inlets (22) are opened on the side wall of the cooling tower (16) below the heat exchange coil (28). A water tank (20) is installed in the tower body below the second air inlet (22). The upper end of the water tank (20) is open. A water supply pipe (13) is installed on the water tank (20). The water tank (20) is connected to the water inlet of the second circulating pump (27). The water outlet of the second circulating pump (27) is connected to the water inlet of the tower spray pipe (25). The water inlet of the heat exchange coil (28) is connected to the air-cooled water outlet main pipe (17). The water outlet of the heat exchange coil (28) is connected to the circulating water outlet pipe (14).

13. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The evaporative cooling device (15) includes a second circulating pump (27) and an internal spray pipe (25) located inside the cooling tower (16). An evaporative packing (23) is installed below the internal spray pipe (25). Several second air inlets (22) are opened on the side wall of the cooling tower (16) below the evaporative packing (23). A water tank (20) is installed inside the tower body below the second air inlets (22). The upper end of the water tank (20) is open, and a water supply pipe (1) is installed on the water tank (20). 3) The water tank (20) is connected to the inlet of the second circulating pump (27), the outlet of the second circulating pump (27) is connected to the primary inlet of the plate heat exchanger (26), the primary outlet of the plate heat exchanger (26) is connected to the inlet of the spray pipe (25) inside the tower, the secondary inlet of the plate heat exchanger (26) is connected to the air-cooled water outlet main pipe (17), and the secondary outlet of the plate heat exchanger (26) is connected to the circulating water outlet pipe (14).

14. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The cooling tower (16) has several second air inlets (22) on the lower side wall of the tower body. An evaporative cooling device (15) is installed in the second air inlet (22). The evaporative cooling device (15) includes evaporative packing (23). A water tank (20) is installed on the lower side of the evaporative packing (23), and a water distribution box (29) is installed on the upper side. The water inlet of the water distribution box (29) is connected to the water outlet of the air-cooled water outlet main pipe (17). The upper end of the water tank (20) is open. A water supply pipe (13) and a circulating water outlet pipe (14) are installed on the water tank (20).

15. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The lower tower body of the cooling tower (16) has several second air inlets (22) on its side wall. An evaporative cooling device (15) is installed in the second air inlet (22). The evaporative cooling device (15) includes a second circulating pump (27) and a heat exchange coil (28). A water tank (20) is installed on the lower side of the heat exchange coil (28), and a water distribution box (29) is installed on the upper side. The upper end of the water tank (20) is open. A water supply pipe (13) is installed on the water tank (20). The water tank (20) is connected to the water inlet of the second circulating pump (27). The water outlet of the second circulating pump (27) is connected to the water inlet of the water distribution box (29). The water inlet of the heat exchange coil (28) is connected to the air-cooled water outlet main pipe (17). The water outlet of the heat exchange coil (28) is connected to the circulating water outlet pipe (14).

16. A dry air energy recovery indirect cooling water-saving cooling system as described in any one of claims 1-7, characterized in that: The cooling tower (16) has several second air inlets (22) on the side wall of the lower part of the tower body. An evaporative cooling device (15) is installed in the second air inlet (22). The evaporative cooling device (15) includes a second circulation pump (27) and evaporative packing (23). A water tank (20) is installed on the lower side of the evaporative packing (23), and a water distribution box (29) is installed on the upper side. The upper end of the water tank (20) is open, and a water supply pipe (13) is installed on the water tank (20). The water tank (20) is connected to the inlet of the second circulation pump (27), the outlet of the second circulation pump (27) is connected to the primary inlet of the plate heat exchanger (26), the primary outlet of the plate heat exchanger (26) is connected to the inlet of the water distribution box (29), the secondary inlet of the plate heat exchanger (26) is connected to the air-cooled water outlet main pipe (17), and the secondary outlet of the plate heat exchanger (26) is connected to the circulating water outlet pipe (14).

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