High-low temperature switching type dry-wet cooling tower

Abstract

The utility model discloses a high low temperature switching type dry -wet cooling tower belongs to cooling tower technical field, this cooling tower, including tower body still includes dry -type heat exchange pipe, wet type spraying subassembly, three ways, first flow guide pipe, second flow guide pipe, catch basin, first solenoid valve, second solenoid valve, temperature sensor and controller, dry -type heat exchange pipe and wet type spraying subassembly are established in tower body, and one end of dry -type heat exchange pipe is connected with circulating water backflow pipe, and the other end of dry -type heat exchange pipe is connected with the first port of three ways, and the second port of three ways is connected with wet type spraying subassembly through first flow guide pipe, and one end of second flow guide pipe is connected with three ways, and the other end is linked together with catch basin, and first solenoid valve and second solenoid valve are installed on first flow guide pipe, second flow guide pipe respectively, and temperature sensor transmits the temperature information of outside air to controller, and controller carries out switch control to first solenoid valve and second solenoid valve to realize the dual goal of white fog suppression and energy -efficiency promotion.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, specifically to a high and low temperature switching type dry-wet cooling tower. Background Technology

[0002] As a key heat exchange device in the industrial cooling field, the core function of a cooling tower is to cool process fluids or air conditioning refrigerants through heat and moisture exchange between water and air. Currently, the most common types of cooling towers are wet and dry, but each has its own inherent drawbacks.

[0003] Wet cooling towers enhance evaporative cooling efficiency by spraying process circulating water directly onto the surface of the packing material, thereby strengthening the water-air contact. Although this open structure has high heat exchange efficiency, the evaporation loss of spray water in high-temperature environments can reach 1.5% to 3.0% of the circulating water volume, significantly increasing water resource costs. When operating at low temperatures, the emission of saturated humid air produces white fog, causing visual pollution and environmental penalties. Furthermore, surface icing is prone to occur in winter, leading to packing material collapse.

[0004] Dry cooling towers employ a sealed dry structure, where process circulating water indirectly exchanges heat with the external environment through the pipe walls. While this sealed dry structure reduces zero evaporation loss of process circulating water and suppresses the generation of white mist, the indirect heat exchange method results in a heat exchange efficiency that is 30% to 40% lower than that of wet towers. This leads to a significant increase in energy consumption under high-temperature conditions and requires more heat exchange pipes, resulting in high costs.

[0005] In recent years, the industry has attempted to combine wet and dry structures for optimization, but existing solutions still have fundamental flaws:

[0006] 1. Patent CN105066734B discloses a composite cooling tower that combines a finned tube dry air cooler and a dry cooling tower. High-temperature circulating water is first pre-cooled by the finned tube dry air cooler before entering the dry cooling system for secondary cooling. This solution achieves better cooling than ordinary cooling towers through cascading; however, its operation mode is singular, unable to dynamically open and close subsystems in response to changes in ambient temperature, and the problem of white fog during low-temperature periods remains unresolved.

[0007] 2. Patent CN109595950A adds a dry cooling system to the original wet cooling tower. Although it overcomes the problems of single operation and low efficiency of the existing cooling tower to a certain extent, its wet system and dry system are relatively independent and fail to effectively coordinate the coupling relationship between the two heat transfer modes.

[0008] 3. Patent CN118729809A adopts a dry-wet cascade design, which organically combines the two systems to achieve multi-mode coordinated operation of dry and wet systems. However, it does not introduce a temperature control system, and the machine needs to be stopped when switching, which affects the continuity of production.

[0009] To address the inherent contradictions between energy efficiency, water conservation, and dynamic response in existing cooling towers, there is an urgent need to develop an innovative composite cooling tower with a unique structural design. This tower should seamlessly switch operating modes based on ambient temperature signals, optimize the thermal path, and simultaneously achieve a leap in heat exchange efficiency, efficient water resource utilization, and complete eradication of white fog pollution. Utility Model Content

[0010] The purpose of this invention is to provide a high-low temperature switching dry-wet cooling tower to achieve the dual goals of suppressing white fog and improving energy efficiency.

[0011] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0012] A high-low temperature switching dry-wet cooling tower includes a tower body, a dry heat exchange pipe, a wet spray assembly, a tee, a first guide pipe, a second guide pipe, a water collection tank, a first solenoid valve, a second solenoid valve, a temperature sensor, and a controller. The dry heat exchange pipe and the wet spray assembly are located inside the tower body. One end of the dry heat exchange pipe is connected to a circulating water return pipe, and the other end of the dry heat exchange pipe is connected to the first port of the tee. The second port of the tee is connected to the wet spray assembly through the first guide pipe. One end of the second guide pipe is connected to the third port of the tee, and the other end of the second guide pipe is connected to the water collection tank. The first solenoid valve and the second solenoid valve are respectively installed on the first guide pipe and the second guide pipe. The temperature sensor transmits the ambient air temperature information to the controller, and the controller controls the opening and closing of the first and second solenoid valves.

[0013] Furthermore, the wet spray assembly is located below the dry heat exchange tube.

[0014] Furthermore, the top of the tower body is equipped with an exhaust fan, and the lower side wall of the tower body is equipped with an air inlet located below the wet spray assembly. The water collection tank is located at the bottom of the tower body and below the wet spray assembly.

[0015] Furthermore, the tower body is provided with a packing assembly, which is located below the wet spray assembly and above the air inlet.

[0016] Furthermore, the temperature sensor is installed at the air inlet.

[0017] Furthermore, the water collection tank is connected to a circulating water output pipe.

[0018] Furthermore, heat dissipation fins are provided on the outer wall surface of the dry heat exchange tube.

[0019] Furthermore, the heat dissipation fins have a spiral structure.

[0020] Furthermore, the wet spray assembly includes multiple spray branch pipes and a spray main pipe. The multiple spray branch pipes are located on the same horizontal plane and are connected to the spray main pipe. The spray main pipe is connected to the first guide pipe. Multiple spray heads are distributed on the bottom surface of the spray branch pipes.

[0021] Furthermore, the spray head is embedded in the mounting hole on the wall of the spray branch pipe with the spray head facing downwards.

[0022] The beneficial effects of this utility model are as follows: This application monitors the ambient airflow temperature using a temperature sensor, and adjusts the opening and closing of the first and second solenoid valves according to different ambient temperatures to execute different operating modes, achieving dynamic response to ambient temperature. Under high-temperature conditions, by constructing a pre-cooling-main cooling thermal link, the heat load entering the wet spray assembly is reduced, lowering the evaporation loss rate of the process circulating water; under low-temperature conditions, direct contact between water and air is isolated to reduce visible white fog emissions to zero, simultaneously reducing the risk of icing in winter, lowering maintenance costs, and achieving the dual goals of white fog suppression and energy efficiency improvement.

[0023] This application enables seamless switching of operating modes based on ambient temperature, achieving dynamic response optimization across all climates, and is particularly suitable for regions with diurnal temperature differences greater than 15°C. Attached Figure Description

[0024] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort:

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 for Figure 1 The diagram shows the structure of a dry heat exchange tube.

[0027] In the diagram: 1. Tower body; 2. Dry heat exchange tube; 3. Wet spray assembly; 4. T-junction; 5. First guide pipe; 6. Second guide pipe; 7. Water collection tank; 8. First solenoid valve; 9. Second solenoid valve; 10. Temperature sensor; 11. Controller; 12. Circulating water return pipe; 13. Exhaust fan; 14. Air inlet; 15. Packing assembly; 16. Circulating water output pipe; 17. Spray main pipe; 18. Spray head; 19. Heat dissipation fins. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward", "reverse", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] like Figure 1 As shown, a high-low temperature switching type dry-wet cooling tower includes a tower body 1, a dry heat exchange pipe 2, a wet spray assembly 3, a tee 4, a first guide pipe 5, a second guide pipe 6, a water collection tank 7, a first solenoid valve 8, a second solenoid valve 9, a temperature sensor 10, and a controller 11. The dry heat exchange pipe 2 and the wet spray assembly 3 are located inside the tower body 1. One end of the dry heat exchange pipe 2 is connected to the circulating water return pipe 12, and the other end of the dry heat exchange pipe 2 is connected to the first port of the tee 4. The second port of the tee 4 is connected to the wet spray assembly 3 through the first guide pipe 5. One end of the second guide pipe 6 is connected to the third port of the tee 4, and the other end of the second guide pipe 6 is connected to the water collection tank 7. The first solenoid valve 8 and the second solenoid valve 9 are respectively installed on the first guide pipe 5 and the second guide pipe 6. The temperature sensor 10 transmits the temperature information of the outside air to the controller 11, and the controller 11 controls the opening and closing of the first solenoid valve 8 and the second solenoid valve 9.

[0031] A blower 13 is installed at the top of the tower body 1, and an air inlet 14 is provided on the lower side wall of the tower body 1, located below the wet spray assembly 3. A water collection tank 7 is located at the bottom of the tower body 1 and below the wet spray assembly 3. The water collection tank 7 is connected to a circulating water output pipe 16. A packing assembly 15 is provided inside the tower body 1, located below the wet spray assembly 3 and above the air inlet 14.

[0032] In this embodiment, the temperature sensor 10 is installed at the air inlet 14.

[0033] In this embodiment, the wet spray assembly 3 is located below the dry heat exchange tube 2. The wet spray assembly 3 includes multiple spray branch pipes and a spray main pipe 17. The multiple spray branch pipes are located on the same horizontal plane and are connected to the spray main pipe 17. The spray main pipe 17 is connected to the first guide pipe 5. Multiple spray heads 18 are distributed on the bottom surface of the spray branch pipes. The spray heads 18 are embedded in the mounting holes on the pipe wall of the spray branch pipes and face downwards.

[0034] like Figure 2 As shown, heat dissipation fins 19 are provided on the outer wall surface of the dry heat exchange tube 2, and the heat dissipation fins 19 have a spiral structure.

[0035] Working principle: This application monitors the ambient airflow temperature using a temperature sensor and adjusts the opening and closing of the first solenoid valve 8 and the second solenoid valve 9 according to different ambient temperatures to execute different operating modes, achieving dynamic response to ambient temperature. Under high-temperature conditions, by constructing a pre-cooling-main cooling thermal link, the heat load entering the wet spray assembly 3 is reduced, lowering the evaporation loss rate of the process circulating water; under low-temperature conditions, direct contact between water and air is isolated, achieving the dual goals of white fog suppression and energy efficiency improvement.

[0036] When the temperature sensor detects that the ambient airflow temperature is higher than the set limit, the controller opens the first solenoid valve 8 and closes the second solenoid valve 9, establishing a pre-cooling-main cooling thermal link. The process fluid first enters the dry heat exchange tube 2 for pre-cooling, cooling down through sensible heat exchange. After pre-cooling in the dry heat exchange tube 2, the process fluid flows into the wet spray assembly 3, where it is evenly sprayed onto the packing assembly via spray heads 18. A water film is formed in the packing assembly, directly contacting the air inside the tower, achieving cooling primarily through latent heat exchange and secondarily through sensible heat exchange. The circulating water after the second cooling is collected in the water collection tank 7, filtered through a filter screen, and discharged through the circulating water output pipe 16. In this process, the process circulating water is pre-cooled, reducing the heat load entering the wet spray assembly 3 and lowering the evaporation loss rate of the process circulating water.

[0037] When the temperature sensor detects that the ambient airflow temperature is lower than the set limit, the controller closes the first solenoid valve 8 and opens the second solenoid valve 9. The circulating hot water only passes through the dry heat exchange tube 2, where it exchanges sensible heat with the air inside the tower before returning to the circulation system. This process isolates water and air from contact heat exchange, keeping the relative humidity of the exhaust air at a low level, achieving zero emissions of visible white mist under low-temperature conditions, and simultaneously reducing the risk of icing in winter and lowering maintenance costs.

[0038] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-low temperature switching type dry-wet cooling tower, comprising a tower body, characterized in that: It also includes a dry heat exchange pipe, a wet spray assembly, a tee, a first guide pipe, a second guide pipe, a water collection tank, a first solenoid valve, a second solenoid valve, a temperature sensor, and a controller. The dry heat exchange pipe and the wet spray assembly are located inside the tower. One end of the dry heat exchange pipe is connected to the circulating water return pipe, and the other end of the dry heat exchange pipe is connected to the first port of the tee. The second port of the tee is connected to the wet spray assembly through the first guide pipe. One end of the second guide pipe is connected to the third port of the tee, and the other end of the second guide pipe is connected to the water collection tank. The first solenoid valve and the second solenoid valve are respectively installed on the first guide pipe and the second guide pipe. The temperature sensor transmits the temperature information of the outside air to the controller, and the controller controls the opening and closing of the first solenoid valve and the second solenoid valve.

2. The high and low temperature switching type dry-wet cooling tower according to claim 1, characterized in that: The wet spray assembly is located below the dry heat exchange tube.

3. A high-low temperature switching type dry-wet cooling tower according to claim 1, characterized in that: The top of the tower is equipped with an exhaust fan, and the lower side wall of the tower is equipped with an air inlet located below the wet spray assembly. The water collection tank is located at the bottom of the tower and below the wet spray assembly.

4. A high-low temperature switching type dry-wet cooling tower according to claim 3, characterized in that: The tower body is equipped with a packing assembly, which is located below the wet spray assembly and above the air inlet.

5. A high-low temperature switching type dry-wet cooling tower according to claim 4, characterized in that: The temperature sensor is installed at the air inlet.

6. A high-low temperature switching type dry-wet cooling tower according to claim 1, characterized in that: The water collection tank is connected to a circulating water output pipe.

7. A high-low temperature switching type dry-wet cooling tower according to claim 1, characterized in that: The outer wall surface of the dry heat exchange tube is provided with heat dissipation fins.

8. A high-low temperature switching type dry-wet cooling tower according to claim 7, characterized in that: The heat dissipation fins have a spiral structure.

9. A high-low temperature switching type dry-wet cooling tower according to claim 1, characterized in that: The wet spray assembly includes multiple spray branch pipes and a spray main pipe. The multiple spray branch pipes are located on the same horizontal plane and are connected to the spray main pipe. The spray main pipe is connected to a first guide pipe. Multiple spray heads are distributed on the bottom surface of the spray branch pipes.

10. A high-low temperature switching type dry-wet cooling tower according to claim 9, characterized in that: The spray head is embedded in the mounting hole on the wall of the spray branch pipe with the spray head facing downwards.

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