Multi-stage heat exchange evaporative condenser

Abstract

The invention discloses a multi-stage heat exchange evaporative condenser, which belongs to the technical field of evaporative condensers, and comprises a shell, and three stages of heat exchange units for improving the heat exchange efficiency in a grading manner are sequentially arranged in the shell along the airflow direction; a spraying system used for uniformly distributing water and forming evaporative cooling and a fan used for forcibly sucking air are arranged at the top of the shell, a water collecting tank used for collecting circulating water and reducing scale deposition is arranged at the bottom of the shell, and the water collecting tank is connected with the spraying system through a circulating water pump used for maintaining water circulation; through the arrangement of the three stages of heat exchange units, multi-stage heat exchange of the evaporative condenser is achieved, and the problem that heat exchange of a high-temperature section is insufficient is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of evaporative condensers, and particularly relates to a multi-stage heat exchange evaporative condenser. Background Art

[0002] An evaporative condenser utilizes water evaporation and forced air circulation to carry away the condensation heat, thereby cooling the high-temperature and high-pressure superheated steam discharged by a compressor so that the steam condenses into a liquid and is discharged. It is widely used in industries such as petrochemical, light industry, medicine, and food refrigeration. A super-efficient evaporative condenser is made of high-quality carbon steel galvanized, is reliable in use, has a long service life, and the evaporative condenser has an independent circulating cooling system by itself, is not affected by other equipment, is beneficial to the maintenance of the equipment and environmental protection, and has good water-saving and energy-saving effects. Existing evaporative condensers have the problem of insufficient heat exchange in the high-temperature section. Patent publication number CN222165242U discloses an evaporative condenser with multi-stage heat exchange, which adopts a single-stage coil design to solve rain and snow protection, and does not optimize heat transfer, resulting in the problem of insufficient heat exchange. Traditional evaporative condensers have low heat exchange efficiency. Especially in high-humidity working conditions, it is difficult for a single heat exchange section to achieve deep cooling, and the fixed structure cannot adapt to complex installation environments. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a multi-stage heat exchange evaporative condenser to solve the problems in the above background art.

[0004] The purpose of the present invention is achieved as follows: A multi-stage heat exchange evaporative condenser includes a housing. Inside the housing, a three-stage heat exchange unit for grading and improving the heat exchange efficiency is sequentially arranged along the air flow direction. At the top of the housing, a spray system for uniformly distributing water and forming evaporative cooling and a fan for forcibly sucking air are provided. At the bottom of the housing, a water collecting tank for collecting circulating water and reducing scale deposition is provided. The water collecting tank is connected to the spray system through a circulating water pump for maintaining water circulation; The three-stage heat exchange unit includes: A first-stage evaporation heat exchange section for initial pre-cooling, a second-stage enhanced heat exchange section for enhancing heat exchange, and a third-stage deep cooling section for deep cooling. Flow guiding partitions for optimizing air flow distribution and reducing pressure drop are arranged between the heat exchange sections; Air inlet louvers for controlling the air intake volume and maintenance doors for facilitating maintenance are arranged on the side wall of the housing, and a support frame for adjusting the height of the equipment and adapting to the installation environment is arranged at the bottom of the housing. During use, the first-stage evaporation heat exchange section adopts a smooth tube structure to achieve initial pre-cooling of the refrigerant, and cools the high-temperature refrigerant to the saturation temperature.

[0005] Furthermore, the secondary enhanced heat exchange section includes finned tube groups arranged in a staggered manner for expanding the heat exchange area and corrugated flow deflectors for prolonging the residence time of the water film. Liquid collection distributors for evenly distributing the refrigerant are respectively connected to both ends of the tube side of the finned tube groups; a hydrophilic coating for improving the uniformity of the water film distribution is provided on the surface of the corrugated flow deflectors, and the corrugation angle thereof is 30 - 45 degrees. During use, the secondary enhanced heat exchange section expands the heat exchange area through the finned tube groups, and the corrugated flow deflectors prolong the residence time of the water film. The design of the corrugation angle of 30 - 45 degrees can increase the water film coverage rate by more than 40%.

[0006] Furthermore, the tertiary deep cooling section adopts a two-dimensional finned elliptical tube bundle structure for enhancing turbulent heat transfer. The tube bundles are arranged in an equilateral triangle, and the tube pitch is 1.5 - 2 times the tube diameter; a spiral turbulator for disrupting the laminar boundary layer is arranged inside the elliptical tube bundles. During use, the tertiary deep cooling section adopts the elliptical tube bundles to generate a turbulent effect, and the spiral turbulator disrupts the laminar boundary layer, thereby increasing the heat transfer coefficient.

[0007] Furthermore, the spraying system includes a spraying main pipe arranged in a ring shape for stabilizing the water pressure and radially branched pipes. Swirl atomizing nozzles for generating micron-sized atomized water droplets are equidistantly arranged on the branched pipes; a water quality filter for preventing nozzle blockage is arranged between the spraying main pipe and the circulation water pump. During use, the layout of the radially branched pipes ensures that the difference in the spraying density of each area is less than 5%. 50 - 100μm atomized water droplets are generated through the swirl atomizing nozzles, saving 30% water compared with traditional nozzles. The water quality filter uses a 20-mesh stainless steel filter screen to intercept impurities.

[0008] Furthermore, the fan is an axial-flow variable-frequency fan for energy-saving adjustment. A splash-proof conical cover for preventing water droplets from being sucked back is arranged below the impeller; guide ribs for guiding the air flow direction are arranged on the surface of the splash-proof conical cover, and a water collecting tank for collecting splashed water is arranged at the bottom edge. An inclined filter screen for intercepting impurities is arranged inside the water collecting tank, and a V-shaped sedimentation tank for concentrating sediment is arranged at the bottom thereof; a visual liquid level gauge for real-time monitoring of the water level and an automatic sewage discharge pipe for automatically discharging sludge are arranged on the side wall of the water collecting tank. During use, the inclined filter screen is arranged at an inclination angle of 60 degrees, and cooperating with the conical structure of the V-shaped sedimentation tank, the sedimentation speed of the sludge can be reduced by 50%. An electric valve is arranged on the automatic sewage discharge pipe, and the sewage discharge is automatically started when the liquid level gauge detects that the sediment exceeds 30% of the volume.

[0009] Furthermore, the circulating water pump adopts a vertical multi-stage centrifugal pump for adapting to high head requirements, and a pressure regulating valve for stabilizing water pressure and a flow meter for measuring water flow are arranged on its outlet pipe; an anti-siphon device for preventing water backflow when the pump is stopped is arranged between the circulating water pump and the water collecting tank. The shell adopts a double-layer stainless steel insulation structure for reducing heat loss, the outer layer is a 304 stainless steel plate for corrosion resistance, the middle layer is filled with polyurethane foam material for heat insulation, and the inner layer is a 316L stainless steel corrugated plate for enhancing airflow disturbance.

[0010] Furthermore, the axial flow variable frequency fan is equipped with a temperature sensing speed control system for intelligent energy saving, including a temperature sensor for detecting the exhaust temperature at the outlet of the three-stage deep cooling section, a variable frequency controller for adjusting the speed set on the fan motor, and a PLC control unit for realizing closed-loop control. When in use, the temperature sensor monitors the outlet temperature in real time, and the PLC control unit dynamically adjusts the fan speed according to the temperature difference, reducing energy consumption by 15-20%; the variable frequency controller uses a PID algorithm to achieve temperature control accuracy.

[0011] Furthermore, a height adjustment support for balancing the uneven foundation is provided at the bottom of the support frame. The height adjustment support includes an upper connecting plate, a lower base and a threaded lifting column arranged in the middle for fine-tuning the height; the outer surface of the threaded lifting column is provided with an anti-corrosion coating for extending the service life to adapt to complex installation environments.

[0012] The beneficial effects of the present invention are as follows: through the setting of the three-stage heat exchange unit, multi-stage heat exchange of the evaporative condenser is realized, the problem of insufficient heat exchange in the high-temperature section is solved, and the first-stage evaporative heat exchange section adopts a light pipe structure to realize the initial pre-cooling of the refrigerant, and the high-temperature refrigerant is cooled to the saturation temperature; the second-stage enhanced heat exchange section expands the heat exchange area through the fin tube group, the corrugated guide plate prolongs the water film residence time, and the 30-45 degree corrugated angle design improves the water film coverage rate; the third-stage deep cooling section adopts an elliptical tube bundle to produce a turbulent effect, and the spiral turbulator destroys the laminar boundary layer, so that the heat transfer coefficient is further improved. When in use, the radial branch pipe layout ensures that the difference in spray density in each area is less than 5%, and 50-100μm atomized water droplets are generated through the swirl atomizing nozzle, which saves 30% water compared with the traditional nozzle, and the water quality filter uses a 20-mesh stainless steel filter to intercept impurities. The inclined filter is arranged at an angle of 60 degrees, and with the conical structure of the V-shaped sedimentation tank, the sludge deposition rate can be reduced by 50%. The automatic sewage pipe is equipped with an electric valve, which automatically starts sewage discharge when the liquid level meter detects that the sediment exceeds 30% of the volume. The temperature sensor monitors the outlet temperature in real time, and the PLC control unit dynamically adjusts the fan speed according to the temperature difference, reducing energy consumption by 15-20%; the frequency conversion controller uses the PID algorithm to achieve temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1is the front view structural schematic diagram of the present invention; Figure 2 is the top view structural schematic diagram of the present invention; Figure 3 is the left view structural schematic diagram of the present invention; Figure 4 is the left view three-dimensional structural schematic diagram of the present invention; Figure 5 is the right view three-dimensional structural schematic diagram of the present invention; Figure 6 is the bottom view three-dimensional structural schematic diagram of the present invention; Figure 7 is of the present invention Figure 6 enlarged view of A; Figure 8 is the schematic Figure 3 structural schematic diagram of the primary heat exchange unit; Figure 9 is of the present invention Figure 8 enlarged view of B.

[0014] In the figure: 1 housing, 2 tertiary heat exchange unit, 3 spraying system, 4 fan, 5 water collection tank, 6 circulating water pump, 7 primary evaporation heat exchange section, 8 secondary enhanced heat exchange section, 9 tertiary deep cooling section, 10 flow guiding partition, 11 air inlet louvers, 12 maintenance door, 13 support frame, 14 finned tube group, 15 corrugated flow guiding plate, 16 liquid collection distributor, 17 spiral turbulator, 18 water quality filter, 19 upper connecting plate, 20 lower base, 21 threaded lifting column, 22 main spraying pipe, 23 branch pipe, 24 swirl atomizing nozzle. Detailed implementation manner

[0015] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that all the directional terms such as up, down, front, back, left, and right in the present invention do not limit the present invention, but are only used to more clearly illustrate and explain the present invention. Embodiment

[0016] As Figures 1-9As shown in the figure, this embodiment discloses a multi-stage heat exchange evaporative condenser, which includes a housing 1. Inside the housing 1, there are three-stage heat exchange units 2 arranged in sequence along the air flow direction for grading and improving the heat exchange efficiency. At the top of the housing 1, there is a spray system 3 for evenly distributing water and forming evaporative cooling and a fan 4 for forced air suction. At the bottom of the housing 1, there is a water collection tank 5 for collecting circulating water and reducing scale deposition. The water collection tank 5 is connected to the spray system 3 through a circulating water pump 6 for maintaining the water circulation. The three-stage heat exchange unit 2 includes: a primary evaporation heat exchange section 7 for initial precooling, a secondary enhanced heat exchange section 8 for enhancing heat exchange, and a tertiary deep cooling section 9 for deep cooling. Between each heat exchange section, there is a flow guide partition 10 for optimizing the air flow distribution and reducing the pressure drop. On the side wall of the housing 1, there are air inlet louvers 11 for controlling the air intake and a maintenance door 12 for easy maintenance. At the bottom of the housing 1, there is a support frame 13 for adjusting the equipment height and adapting to the installation environment. During use, the primary evaporation heat exchange section 7 adopts a smooth tube structure to achieve the initial precooling of the refrigerant and cool the high-temperature refrigerant to the saturation temperature. The secondary enhanced heat exchange section 8 includes finned tube groups 14 arranged in a staggered manner for expanding the heat exchange area and corrugated flow guide plates 15 for extending the residence time of the water film. At both ends of the tube side of the finned tube group 14, there are liquid collection distributors 16 for evenly distributing the refrigerant. The surface of the corrugated flow guide plate 15 is provided with a hydrophilic coating for improving the uniformity of the water film distribution, and its corrugation angle is 30 - 45 degrees. During use, the secondary enhanced heat exchange section 8 expands the heat exchange area through the finned tube groups 14, and the corrugated flow guide plates 15 extend the residence time of the water film. The design of the corrugation angle of 30 - 45 degrees can increase the water film coverage rate by more than 40%. The tertiary deep cooling section 9 adopts a two-dimensional finned elliptical tube bundle structure for enhancing turbulent heat exchange. The tube bundles are arranged in an equilateral triangle, and the tube pitch is 1.5 - 2 times the tube diameter. Inside the elliptical tube bundle, there is a spiral turbulator 17 for destroying the laminar boundary layer. During use, the tertiary deep cooling section 9 generates a turbulent effect by using the elliptical tube bundle, and the spiral turbulator 17 destroys the laminar boundary layer, increasing the heat transfer coefficient. Embodiment

[0017] As Figures 1-9As shown in the figure, this embodiment discloses a multi-stage heat exchange evaporative condenser, which includes a housing 1. Inside the housing 1, there are three-stage heat exchange units 2 arranged in sequence along the air flow direction for grading and improving the heat exchange efficiency. At the top of the housing 1, there is a spray system 3 for uniformly distributing water and forming evaporative cooling and a fan 4 for forcibly sucking air. At the bottom of the housing 1, there is a water collecting tank 5 for collecting circulating water and reducing scale deposition. The water collecting tank 5 is connected to the spray system 3 through a circulating water pump 6 for maintaining the water circulation. The three-stage heat exchange unit 2 includes: a primary evaporation heat exchange section 7 for initial precooling, a secondary enhanced heat exchange section 8 for enhancing heat exchange, and a tertiary deep cooling section 9 for deep cooling. There are guide baffles 10 between the heat exchange sections for optimizing the air flow distribution and reducing the pressure drop. On the side wall of the housing 1, there are air inlet louvers 11 for controlling the air intake and a maintenance door 12 for easy maintenance. At the bottom of the housing 1, there is a support frame 13 for adjusting the equipment height and adapting to the installation environment. During use, the primary evaporation heat exchange section 7 adopts a smooth tube structure to achieve the initial precooling of the refrigerant and cool the high-temperature refrigerant to the saturation temperature. The secondary enhanced heat exchange section 8 includes finned tube groups 14 arranged in a staggered manner for expanding the heat exchange area and corrugated guide plates 15 for prolonging the residence time of the water film. At both ends of the tube side of the finned tube group 14, there are liquid collecting distributors 16 for uniformly distributing the refrigerant. The surface of the corrugated guide plate 15 is provided with a hydrophilic coating for improving the uniformity of the water film distribution, and its corrugation angle is 30 - 45 degrees. During use, the secondary enhanced heat exchange section 8 expands the heat exchange area through the finned tube groups 14, and the corrugated guide plates 15 prolong the residence time of the water film. The design of the corrugation angle of 30 - 45 degrees can increase the water film coverage rate by more than 40%. The tertiary deep cooling section 9 adopts a two-dimensional finned elliptical tube bundle structure for enhancing turbulent heat transfer. The tube bundles are arranged in an equilateral triangle, and the tube pitch is 1.5 - 2 times the tube diameter. Inside the elliptical tube bundle, there is a spiral turbulator 17 for destroying the laminar boundary layer. During use, the tertiary deep cooling section 9 uses the elliptical tube bundle to generate a turbulent effect, and the spiral turbulator 17 destroys the laminar boundary layer, increasing the heat transfer coefficient.

[0018] For better effect, the spray system 3 includes a spray main pipe 22 arranged in a ring for stabilizing the water pressure and radially branched pipes 23. On the branched pipes 23, there are swirl atomizing nozzles 24 for generating micron-sized atomized water droplets at equal intervals. Between the spray main pipe 22 and the circulating water pump 6, there is a water quality filter 18 for preventing nozzle blockage. During use, the layout of the radially branched pipes 23 ensures that the difference in the spray density in each area is less than 5%. The swirl atomizing nozzles 24 generate 50 - 100 μm atomized water droplets, saving 30% water compared with traditional nozzles. The water quality filter 18 uses a 20-mesh stainless steel filter screen to intercept impurities.

[0019] In order to achieve better results, the fan 4 is an axial-flow variable-frequency fan 4 for energy-saving regulation, and a splash-proof cone cover is arranged under the impeller to prevent water droplets from being sucked back; the surface of the splash-proof cone cover is provided with guide ribs for guiding the direction of the airflow, and a water collection tank for collecting splashing water is arranged at the bottom edge. The water collection tank 5 is provided with an inclined filter screen for intercepting impurities, and a V-shaped sedimentation tank for concentrating sediments is arranged at the bottom; the side wall of the water collection tank 5 is provided with a visual liquid level gauge for real-time monitoring of the water level and an automatic sewage pipe for automatically discharging sludge. When in use, the inclined filter screen is arranged at an angle of 60 degrees, and with the conical structure of the V-shaped sedimentation tank, the sludge deposition speed can be reduced by 50%. The automatic sewage pipe is provided with an electric valve, and the sewage discharge is automatically started when the liquid level gauge detects that the sediment exceeds 30% of the volume.

[0020] For better effect, the circulating water pump 6 adopts a vertical multi-stage centrifugal pump for adapting to high head requirements, and its outlet pipe is provided with a pressure regulating valve for stabilizing water pressure and a flow meter for measuring water flow; an anti-siphon device for preventing water backflow when the pump is stopped is provided between the circulating water pump 6 and the water collecting tank 5. The housing 1 adopts a double-layer stainless steel insulation structure for reducing heat loss, the outer layer is a 304 stainless steel plate for corrosion resistance, the middle layer is filled with polyurethane foam material for heat insulation, and the inner layer is a 316L stainless steel corrugated plate for enhancing airflow disturbance. Example

[0021] like Figures 1-9As shown in the figure, this embodiment discloses a multi-stage heat exchange evaporative condenser, which includes a housing 1. Inside the housing 1, three-stage heat exchange units 2 for grading and improving the heat exchange efficiency are sequentially arranged along the air flow direction. At the top of the housing 1, there is a spray system 3 for uniformly distributing water and forming evaporative cooling, and a fan 4 for forcibly sucking air. At the bottom of the housing 1, there is a water collection tank 5 for collecting circulating water and reducing scale deposition. The water collection tank 5 is connected to the spray system 3 through a circulating water pump 6 for maintaining the water circulation. The three-stage heat exchange unit 2 includes: a primary evaporation heat exchange section 7 for initial precooling, a secondary enhanced heat exchange section 8 for enhancing heat exchange, and a tertiary deep cooling section 9 for deep cooling. Between each heat exchange section, there is a flow guiding partition 10 for optimizing the air flow distribution and reducing the pressure drop. On the side wall of the housing 1, there are air inlet louvers 11 for controlling the air intake and a maintenance door 12 for easy maintenance. At the bottom of the housing 1, there is a support frame 13 for adjusting the equipment height and adapting to the installation environment. When in use, the primary evaporation heat exchange section 7 adopts a smooth tube structure to achieve the initial precooling of the refrigerant, and cools the high-temperature refrigerant to the saturation temperature. The secondary enhanced heat exchange section 8 includes finned tube groups 14 arranged in a staggered manner for expanding the heat exchange area and corrugated flow guiding plates 15 for extending the residence time of the water film. At both ends of the tube side of the finned tube group 14, there are liquid collecting distributors 16 for uniformly distributing the refrigerant. The surface of the corrugated flow guiding plate 15 is provided with a hydrophilic coating for improving the uniformity of the water film distribution, and its corrugation angle is 30 - 45 degrees. When in use, the secondary enhanced heat exchange section 8 expands the heat exchange area through the finned tube groups 14, and the corrugated flow guiding plates 15 extend the residence time of the water film. The design of the 30 - 45 degree corrugation angle can increase the water film coverage rate by more than 40%. The tertiary deep cooling section 9 adopts a two-dimensional finned elliptical tube bundle structure for enhancing turbulent heat transfer. The tube bundles are arranged in an equilateral triangle, and the tube pitch is 1.5 - 2 times the tube diameter. Inside the elliptical tube bundle, there is a spiral turbulator 17 for destroying the laminar boundary layer. When in use, the tertiary deep cooling section 9 generates a turbulent effect by using the elliptical tube bundle, and the spiral turbulator 17 destroys the laminar boundary layer, thereby increasing the heat transfer coefficient.

[0022] For better effect, the spray system 3 includes a spray main pipe 22 arranged in a ring shape for stabilizing the water pressure and radially branched pipes 23. On the branched pipes 23, there are swirl atomizing nozzles 24 for generating micron-sized atomized water droplets at equal intervals. Between the spray main pipe 22 and the circulating water pump 6, there is a water quality filter 18 for preventing nozzle blockage. When in use, the layout of the radially branched pipes 23 ensures that the difference in the spray density in each area is less than 5%. The swirl atomizing nozzles 24 generate 50 - 100 μm atomized water droplets, saving 30% of water compared with traditional nozzles. The water quality filter 18 uses a 20-mesh stainless steel filter screen to intercept impurities.

[0023] In order to achieve better results, the fan 4 is an axial-flow variable-frequency fan 4 for energy-saving regulation, and a splash-proof cone cover is arranged under the impeller to prevent water droplets from being sucked back; the surface of the splash-proof cone cover is provided with guide ribs for guiding the direction of the airflow, and a water collection tank for collecting splashing water is arranged at the bottom edge. The water collection tank 5 is provided with an inclined filter screen for intercepting impurities, and a V-shaped sedimentation tank for concentrating sediments is arranged at the bottom; the side wall of the water collection tank 5 is provided with a visual liquid level gauge for real-time monitoring of the water level and an automatic sewage pipe for automatically discharging sludge. When in use, the inclined filter screen is arranged at an angle of 60 degrees, and with the conical structure of the V-shaped sedimentation tank, the sludge deposition speed can be reduced by 50%. The automatic sewage pipe is provided with an electric valve, and the sewage discharge is automatically started when the liquid level gauge detects that the sediment exceeds 30% of the volume.

[0024] For better effect, the circulating water pump 6 adopts a vertical multi-stage centrifugal pump for adapting to high head requirements, and its outlet pipe is provided with a pressure regulating valve for stabilizing water pressure and a flow meter for measuring water flow; an anti-siphon device for preventing water backflow when the pump is stopped is provided between the circulating water pump 6 and the water collecting tank 5. The housing 1 adopts a double-layer stainless steel insulation structure for reducing heat loss, the outer layer is a 304 stainless steel plate for corrosion resistance, the middle layer is filled with polyurethane foam material for heat insulation, and the inner layer is a 316L stainless steel corrugated plate for enhancing airflow disturbance.

[0025] In order to achieve better results, the axial flow variable frequency fan 4 is equipped with a temperature sensing speed control system for intelligent energy saving, including a temperature sensor for detecting the exhaust temperature at the outlet of the three-stage deep cooling section 9, a variable frequency controller for adjusting the speed set on the fan 4 motor, and a PLC control unit for realizing closed-loop control. When in use, the temperature sensor monitors the outlet temperature in real time, and the PLC control unit dynamically adjusts the speed of the fan 4 according to the temperature difference, so that the energy consumption is reduced by 15-20%; the variable frequency controller adopts the PID algorithm to achieve temperature control accuracy.

[0026] For better effect, a height adjustment support for balancing the uneven foundation is provided at the bottom of the support frame 13. The height adjustment support includes an upper connecting plate 19, a lower base 20 and a threaded lifting column 21 arranged in the middle for fine-tuning the height; the outer surface of the threaded lifting column 21 is provided with an anti-corrosion coating for extending the service life.

[0027] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage heat exchange evaporative condenser, characterized in that: It includes a housing, inside which there are three-stage heat exchange units arranged in sequence along the air flow direction for grading and enhancing the heat exchange efficiency. At the top of the housing, there is a spray system for evenly distributing water and forming evaporative cooling, and a fan for forcibly sucking air. At the bottom of the housing, there is a water collection tank for collecting circulating water and reducing scale deposition. The water collection tank is connected to the spray system through a circulating water pump for maintaining the water circulation. The three-stage heat exchange unit includes a primary evaporation heat exchange section for initial precooling, a secondary enhanced heat exchange section for enhancing heat exchange, and a tertiary deep cooling section for deep cooling. Between each heat exchange section, there is a flow guide baffle for optimizing the air flow distribution and reducing the pressure drop. On the side wall of the housing, there are air inlet louvers for controlling the air intake volume and a maintenance door for easy maintenance. At the bottom of the housing, there is a support frame for adjusting the equipment height and adapting to the installation environment.

2. The multi-stage heat exchange evaporative condenser according to claim 1, characterized in that: The secondary enhanced heat exchange section includes finned tube groups arranged alternately for expanding the heat exchange area and corrugated flow guide plates for prolonging the residence time of the water film. At both ends of the tube side of the finned tube groups, there are liquid collection distributors for evenly distributing the refrigerant. On the surface of the corrugated flow guide plates, there is a hydrophilic coating for improving the uniformity of the water film distribution.

3. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: The tertiary deep cooling section adopts a two-dimensional finned elliptical tube bundle structure for enhancing turbulent heat transfer. The tube bundles are arranged in an equilateral triangle pattern, and the tube pitch is 1.5 - 2 times the tube diameter. Inside the elliptical tube bundles, there are spiral turbulators for destroying the laminar boundary layer.

4. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: The spray system includes a spray main pipe arranged in a ring shape for stabilizing the water pressure and radial branch pipes. On the branch pipes, there are swirl atomizing nozzles arranged at equal intervals for generating micron-sized atomized water droplets. Between the spray main pipe and the circulating water pump, there is a water quality filter for preventing nozzle blockage.

5. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: The fan is an axial flow variable frequency fan for energy-saving adjustment. Below its impeller, there is a splash-proof conical cover for preventing water droplets from being sucked back. On the surface of the splash-proof conical cover, there are flow guide ribs for guiding the air flow direction, and at the bottom edge, there is a water collection trough for collecting splashed water.

6. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: Inside the water collection tank, there is an inclined filter net for intercepting impurities, and at the bottom, there is a V-shaped sedimentation tank for concentrating sediments. On the side wall of the water collection tank, there is a visible liquid level gauge for real-time monitoring of the water level and an automatic sewage discharge pipe for automatically discharging sludge.

7. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: The circulating water pump is a vertical multi-stage centrifugal pump for adapting to high head requirements. On its outlet pipeline, there is a pressure regulating valve for stabilizing the water pressure and a flow meter for measuring the water flow rate. Between the circulating water pump and the water collection tank, there is an anti-siphon device for preventing water from flowing back when the pump stops.

8. The multi-stage heat exchange evaporative condenser according to claim 1, wherein: The housing adopts a double-layer stainless steel heat preservation structure for reducing heat loss. The outer layer is a 304 stainless steel plate for anti-corrosion, the middle layer is filled with polyurethane foam for heat insulation, and the inner layer is a 316L stainless steel corrugated plate for enhancing air flow disturbance.

9. The multi-stage heat exchange evaporative condenser according to claim 4, wherein: The axial flow variable frequency fan is configured with a temperature induction speed regulation system for intelligent energy saving, including a temperature sensor arranged at the outlet of the tertiary deep cooling section for detecting the exhaust gas temperature, a variable frequency controller arranged on the fan motor for adjusting the speed, and a PLC control unit for realizing closed-loop control.

10. The multi-stage heat exchange evaporative condenser according to claim 1, characterized in that: A height adjustment support for balancing uneven ground is provided at the bottom of the support frame. The height adjustment support includes an upper connecting plate, a lower base, and a threaded lifting column disposed in the middle for fine-tuning the height. An anti-corrosion coating for extending the service life is provided on the outer surface of the threaded lifting column.

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