An environmentally friendly plate-type wet air cooler

Abstract

The present invention discloses an environmentally friendly plate-type wet air cooler, which relates to the technical field of plate-type wet air coolers and includes a control system, a pressure regulating system, a spraying system, a water supply system, and a heat exchange unit. The pressure regulating system includes a first-level pressure reducing valve, a second-level pressure reducing valve, a first-level pressure stabilizing tank, a second-level pressure stabilizing tank, a first-level temperature measuring element, a second-level temperature measuring element, a first-level pressure transmitter, and a second-level pressure transmitter; the water supply system includes an electronic water treatment instrument, a first-level liquid level transmitter, a first-level check valve, a first-level water supply regulating valve, a second-level liquid level transmitter, a second-level check valve, and a second-level water supply regulating valve. The present invention has a high degree of automation control and can control the outlet temperature of different heat exchange sections of the heat medium; it can reduce liquid entrainment and achieve good non-condensable gas separation; the spraying effect is stable and the heat extraction effect is good; it can prevent nozzle clogging and plate scaling; the spray water is recyclable, has good water-saving and anti-freezing effects, is more environmentally friendly, and the wet air cooler has strong corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of plate-type wet air coolers, and in particular to an environmentally friendly plate-type wet air cooler. Background Art

[0002] A plate-type wet air cooler is a novel air cooler that combines the advantages of both plate and air-cooled heat exchangers. It boasts high heat transfer efficiency and a large flow area, making it suitable for condensing and cooling applications with stringent pressure drop requirements and a compact footprint. It has widespread application in fields such as oil refining and coal chemical processing. Patent CN103185475A proposes a plate-type wet air cooler, which is of great significance for improving the performance of plate-type air coolers. However, it has certain limitations in terms of refined operation, safety, and environmental protection.

[0003] For on-site applications of plate-type wet air coolers, since the cooling medium is a mixture of air and spray water, it is easily affected by factors such as ambient temperature and humidity. Under extreme conditions, the outlet temperature of the hot side medium will be too high, and due to the lack of control and adjustment, it cannot meet downstream processing requirements.

[0004] In condensation cooling applications, a single plate structure is used without considering the effect of medium flow conditions on heat transfer under the conditions of gas-to-gas heat exchange in the condensation section and gas-to-liquid heat exchange in the cooling section, resulting in poor heat exchange stability.

[0005] The moisture entrained in the air is heated by the heat medium in the plate bundle and discharged from the system through the induced draft fan. The air outlet of the plate-type wet air cooler carries a large amount of water, and water is easily accumulated around the air cooler. In the cold winter weather, the entrained water forms ice near the induced draft fan outlet, causing water loss, high water consumption, and poor safety.

[0006] The entrained water forms ice near the outlet of the induced draft fan, causing water loss. At the same time, it mixes with acidic substances in the air and condenses around the equipment to form acid dew, which corrodes the surrounding equipment frames. Summary of the Invention

[0007] The purpose of the present invention is to solve the defects in the prior art and to propose an environmentally friendly plate-type wet air cooler.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] An environmentally friendly plate-type wet air cooler, comprising a control system, a pressure regulating system, a spraying system, a water supply system, and a heat exchange unit, wherein the control system is integrated in a control cabinet;

[0010] The pressure regulating system includes a primary pressure reducing valve, a secondary pressure reducing valve, a primary pressure stabilizing tank, a secondary pressure stabilizing tank, a primary temperature measuring element, a secondary temperature measuring element, a primary pressure transmitter, and a secondary pressure transmitter;

[0011] The water supply system includes an electronic water treatment instrument, a first-level liquid level transmitter, a first-level check valve, a first-level water supply regulating valve, a second-level liquid level transmitter, a second-level check valve, and a second-level water supply regulating valve;

[0012] The first-level pressure stabilizing tank is connected to the first-level pressure gas and the first-level spray water supply respectively; the second-level pressure stabilizing tank is connected to the second-level pressure gas and the second-level spray water supply respectively;

[0013] The spray system is arranged on one side of the heat exchange unit, and the spray system includes a primary spray pipe, a secondary spray pipe, a nozzle, a mist catcher, and a water collecting tank;

[0014] The first-level pressure gas and the first-level spray water are mixed in the first-level pressure stabilizing tank and then transported to the first-level spray pipe of the spray system, and sprayed from the nozzle to the heat exchange unit; the second-level pressure gas and the second-level spray water are mixed in the second-level pressure stabilizing tank and then transported to the second-level spray pipe of the spray system, and sprayed from the nozzle to the heat exchange unit;

[0015] The heat exchange unit is provided with a mist collector and a fan on the side away from the spray system. The heat exchange unit includes a heat exchange module, which includes a first-level heat exchange plate bundle and a second-level heat exchange plate bundle distributed up and down; the heat exchange module is connected to the heat medium.

[0016] Furthermore, the first-level pressure-stabilizing tank and the second-level pressure-stabilizing tank are respectively provided with a pressure gas connection pipe, a pressure gauge connection pipe, a safety valve port, a liquid level gauge port A, a liquid level gauge port B, a sewage outlet, a spray water outlet, and an inspection manhole; by adding an external gas source to the pressure-stabilizing tank, the spray water is pressurized and stabilized, the spray effect is stable, and the heat extraction effect is good; the pressure-stabilizing tank can separate impurities in the spray water supply, and the spray water quality can be controlled by regular sewage discharge, and the external gas source is used to purge the spray pipeline, nozzle, plate, etc., which can prevent nozzle clogging and plate scaling;

[0017] The first-level pressure gas is reduced in pressure by the first-level pressure reducing valve and then connected to the first-level pressure stabilizing tank. The first-level spray water flows through the electronic water treatment instrument, the first-level water supply regulating valve, the first-level check valve and then connected to the first-level pressure stabilizing tank.

[0018] The secondary pressure gas is reduced in pressure by the secondary pressure reducing valve and then connected to the secondary pressure stabilizing tank. The secondary spray water flows through the electronic water treatment instrument, the secondary water supply regulating valve, the secondary check valve and then connected to the secondary pressure stabilizing tank.

[0019] The electronic water treatment device can prevent the spray water from scaling, corrosion and microbial growth. The plates are not easy to scale and corrode, and the heat exchange effect is good.

[0020] The first-level temperature measuring element is used to detect the temperature of the heat medium in the first-level heat exchange plate bundle, and cooperates with the first-level pressure transmitter and the first-level water supply regulating valve to adjust the spray water pressure delivered from the first-level pressure regulating tank to the first-level spray pipe;

[0021] The secondary temperature measuring element is used to detect the temperature of the heat medium in the secondary heat exchange plate bundle, and cooperates with the secondary pressure transmitter and the secondary water supply regulating valve to adjust the spray water pressure delivered by the secondary pressure regulating tank to the secondary spray pipe.

[0022] Furthermore, the heat exchange module further includes a heat medium inlet pipe, a heat medium inlet head, a transition cone section, an inspection hole, a first-level pressure gauge interface, a second-level pressure gauge interface, a lower head, an inspection flange, and a condensate pipe;

[0023] The first-stage heat exchange plate bundle is located on the upper side of the second-stage heat exchange plate bundle and is connected as a whole through a transition cone section;

[0024] The hot medium enters the heat exchange module through the hot medium inlet pipe, and the spray water sprayed by the nozzle forms cold and wet air with the cold air medium. The hot medium and the cold and wet air exchange heat through the heat exchange module, and condensate and non-condensable gas are formed after the heat exchange, and the condensate and non-condensable gas enter the lower head. A wire mesh demister is provided in the lower head. The material is stainless steel wire or polytetrafluoroethylene wire, which can realize the separation of non-condensable gas and condensate, reduce liquid entrainment, and have a good non-condensable gas separation effect. The non-condensable gas is discharged from the non-condensable gas pipeline, and the condensate is discharged from the condensate pipe through the condensate external interface.

[0025] The fan and the mist collector cooperate with each other to extract the hot air medium formed after the heat exchange of the cold and wet air from the heat exchange module;

[0026] After the spray water has completed the heat exchange through the heat exchange module, it is collected in the water collecting tank and becomes spray water return water, which is used for spraying and heat exchange again.

[0027] Furthermore, the heat transfer element of the first-level heat exchange plate bundle is a condensing plate; the heat transfer element of the second-level heat exchange plate bundle is a cooling plate. The condensing plate and the cooling plate have the same plate width, different stacking thickness, and the same plate structure. They adopt a bubbling plate structure, and the bubbling points are arranged in a 60° equilateral triangle. The plate material is stainless steel, and the surface is sprayed with modified nano-anticorrosion coating.

[0028] Furthermore, the nozzle consists of a connecting section, a flow stabilizing section, and a flow rectifying section. The connecting section adopts a threaded connection form. The length of the flow stabilizing section and the length of the flow rectifying section are 2:1. The flow rectifying section is conical with a cone angle of 120 degrees.

[0029] Furthermore, it also includes a bottom skid, a box roof, a front lifting eye, a rear lifting eye, a front shutter, a rear shutter, and an inspection door;

[0030] The bottom skid is provided with a liquid collecting box, the liquid collecting box is provided with a filter screen, and the skid surface of the bottom skid is inclined toward the liquid collecting box.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention is equipped with multiple subsystems such as a pressure regulating system, a spraying system, a water supply system, a heat exchange unit, etc. All systems adopt a modular design and are integrated and controlled through a control system. All control programs can be preset before leaving the factory. On-site connection with the control cabinet is sufficient to achieve automatic control and adjustment of a single air cooling system. The system has a high degree of automation and is easy to operate.

[0033] 2. The pressure regulating system of the present invention is composed of a first-level pressure reducing valve, a second-level pressure reducing valve, a first-level pressure stabilizing tank, a second-level pressure stabilizing tank, a first-level temperature measuring element, a second-level temperature measuring element, a first-level pressure transmitter, and a second-level pressure transmitter. The pressure reducing valve is used to adjust the pressure in the pressure stabilizing tank to control the outlet temperature of different heat exchange sections of the heat medium, and the heat exchange effect is accurately controlled.

[0034] 3. The present invention is equipped with a primary level transmitter, a primary check valve, a primary water supply regulating valve, a secondary level transmitter, a secondary check valve, and a secondary water supply regulating valve. The level transmitter on the pressure-surge tank is interlocked with the water supply regulating valve to ensure a continuous and stable supply of spray water to the spray system, ensuring the stability of the heat exchange effect. Furthermore, an electronic water treatment device is installed in the water supply system to prevent scaling, corrosion, and microbial growth in the spray water system. This prevents scaling and corrosion of the plates, ensuring a good heat exchange effect.

[0035] 4. The spray system of the present invention is composed of a primary spray pipe, a secondary spray pipe, a nozzle, a mist collector, and a water collecting tank. By arranging the spray pipes in stages, the spray water volume can be adjusted according to the outlet temperature requirements of the medium in different heat exchange sections, and the water-saving effect is good.

[0036] 5. In the present invention, a mist collector is provided between the fan and the heat exchange plate bundle. It is made of a 45-degree inclined corrugated plate. The surface of the corrugated plate is made of a hydrophobically modified non-metallic material. It can separate and recover the liquid in the air after heat extraction and realize the recovery of spray water at the same time, which has a good water-saving effect.

[0037] 6. The heat exchange module of the heat exchange unit in the present invention consists of a heat medium inlet pipe, a heat medium inlet head, a first-level heat exchange plate bundle, a transition cone section, a first-level pressure gauge interface of an inspection hole, a second-level heat exchange plate bundle, a second-level pressure gauge interface, a lower head, an inspection flange, and a condensate pipe. It is also provided with an inspection flange and an inspection hole, adopts an integrated layout, and has a compact modular design structure and is easy to inspect and maintain.

[0038] 7. In the present invention, a wire mesh demister is provided in the lower head of the secondary heat exchange plate bundle. The material is stainless steel wire or polytetrafluoroethylene wire, which can separate non-condensable gas from condensable liquid, reduce liquid entrainment, and achieve good non-condensable gas separation effect.

[0039] 8. The heat exchange section of the heat exchange module in the present invention is divided into two sections. One section is a primary heat exchange plate bundle for implementing the condensation function, and the other section is a secondary heat exchange plate bundle for the cooling section. The two sections have the same plate width and plate shape, but different plate bundle stacking thicknesses. By adopting bubbling corrugated plates, the bubbling points are arranged in a 60° equilateral triangle. The plate bundle can be welded by laser welding or other methods. The bubbling height, bubbling spacing, plate stacking thickness, etc. can be adjusted according to the heat transfer pressure drop requirements. The plate material is stainless steel, and the surface is sprayed with modified nano-anticorrosion coating, which has good corrosion resistance. The heat exchange module can realize flexible design of heat exchange areas for different heat exchange functions, with good processability and strong corrosion resistance.

[0040] 9. In the present invention, by adding an external air source to the pressure-stabilizing tank, the spray water is pressurized and stabilized, the spraying effect is stable, and the heat extraction effect is good; the impurities in the spray water can be separated by the pressure-stabilizing tank, and the spray water quality can be controlled by regular sewage discharge. The external air source is used to purge the spray pipeline, nozzle, plate, etc., which can prevent the nozzle from being blocked and the plate from scaling.

[0041] 10. The present invention is provided with a bottom skid, a box top, a front lifting lug, and a rear lifting lug. All components of the air cooler can be prefabricated and installed as a whole in the factory, can be transported as a whole, and are easy to install on site.

[0042] 11. The front and rear shutters provided in the present invention can achieve a stabilizing effect on the flow of air, realize adjustable air volume, filter impurities in the air, reduce impurities in the air entering the air cooler, and reduce pollution to the spray water; a liquid collecting box is provided on the bottom skid, and a filter is provided on the liquid collecting box. The skid surface of the bottom skid is inclined toward the liquid collecting box, which can reduce water on the skid surface and achieve high-quality recovery of the spray water; the box-type design can reduce the loss of spray water due to evaporation and splashing of the air cooler, prevent white fog in summer and ice in winter, and has good water-saving properties and high environmental protection.

[0043] 12. The nozzle in the present invention consists of a connecting section, a flow stabilizing section, and a flow rectifying section. The connecting section adopts a threaded connection form. The length of the flow stabilizing section is 2:1 to the length of the flow rectifying section. The flow rectifying section is conical with a cone angle of 120 degrees. It is easy to install on site and has a good spraying effect.

[0044] 13. For some occasions where the air contains corrosive media, the present invention adopts hot-dip galvanizing for the air-cooling frame and spraying nano-anti-corrosion coating on the plates, so the air cooler has strong corrosion resistance.

[0045] In summary, the plate-type wet air cooler of the present invention has a high degree of automation control and is simple to operate; it can control the outlet temperature of different heat exchange sections of the heat medium, and the heat exchange effect can be accurately controlled; it adopts an integrated layout and is easy to inspect and maintain; it can reduce liquid entrainment and has a good non-condensable gas separation effect; it can realize flexible design of the heat exchange area for different heat exchange functions; the spraying effect is stable and the heat extraction effect is good; it can prevent the nozzle from being blocked and the plate from scaling; it can be transported as a whole and is easy to install on site; the spray water can be adjusted and recycled, has good water-saving and antifreeze effects, and is highly environmentally friendly; the air cooler has strong corrosion resistance; the on-site operation keys are easy to repair, and it can operate for a long period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0047] Figure 1 It is the process principle diagram of the present invention;

[0048] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0049] Figure 3 Schematic diagrams of the front and side views of the heat exchange module of the present invention;

[0050] Figure 4 It is a structural schematic diagram of the pressure stabilizing tank in the present invention;

[0051] Figure 5 Schematic diagram of the distribution of the first-level spray tube bundle and the second-level spray tube bundle on the side of the heat exchange module in the present invention;

[0052] Figure 6 It is a structural schematic diagram of the nozzle in the present invention.

[0053] In the figure: 1. Fan, 2. Mist catcher, 3. Primary heat exchange plate bundle, 4. Primary spray tube bundle, 5. Primary temperature measuring element, 6. Secondary spray tube bundle, 7. Secondary temperature measuring element, 8. Water collecting tank, 9. Secondary heat exchange plate bundle, 10. Primary pressure reducing valve, 11. Primary water supply regulating valve, 12. Secondary pressure reducing valve, 13. Secondary water supply regulating valve, 14. Nozzle, 15. Primary pressure stabilizing tank, 16. Primary liquid level transmitter, 17. Primary check valve, 18. Secondary liquid level transmitter, 19. Secondary Pressure regulating tank, 20. Secondary check valve, 21. Control cabinet, 22. Heat medium inlet pipe, 23. Heat medium inlet head, 24. Box top, 25. Front shutter, 26. Rear shutter, 27. Condensate outlet, 28. Rear lifting lug, 29. Non-condensable gas pipeline, 30. Bottom skid, 31. Front lifting lug, 32. Spray water external interface, 33. Spray water return external interface, 34. Pressure gas external interface, 35. Pressure gas pipe, 36. Pressure gauge pipe, 37. Primary pressure transmitter, 3 8. Secondary pressure transmitter, 39. Transition cone, 40. Primary pressure gauge port, 41. Non-condensable gas outlet connection, 42. Secondary pressure gauge port, 43. Condensate port, 46. Liquid collection box, 47. Condensate external port, 48. Wire mesh demister, 49. Spray water inlet, 50. Lower head, 51. Inspection flange, 52. Heat exchange module, 53. Safety valve port, 54. Liquid level gauge port A, 55. Liquid level gauge port B, 56. Drain port, 57. Safety valve port, 58. Inspection hole, 59. Filter, 60. Inspection door, 61. Connecting section, 62. Flow stabilization section, 63. Rectification section, 64. Spray water outlet, 65. Inspection manhole, 66. Electronic water treatment instrument, 1001. Heat medium, 1002. First-level pressure gas, 1003. First-level spray water supply, 1004. Second-level pressure gas, 1005. Second-level spray water supply, 1006. Spray water return, 1007. Condensate, 1008. Non-condensable gas, 1009. Cold air medium, 1010. Hot air medium. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention;

[0055] Reference Figure 1-6 , an environmentally friendly plate-type wet air cooler, including a control system, a pressure regulating system, a spraying system, a water supply system, and a heat exchange unit, wherein the control system is integrated in a control cabinet 21;

[0056] The pressure regulating system includes a first-level pressure reducing valve 10, a second-level pressure reducing valve 12, a first-level pressure stabilizing tank 15, a second-level pressure stabilizing tank 19, a first-level temperature measuring element 5, a second-level temperature measuring element 7, a first-level pressure transmitter 37, and a second-level pressure transmitter 38; the pressure in the pressure stabilizing tank is adjusted by the pressure reducing valve to control the outlet temperature of different heat exchange sections of the heat medium 1001, and the heat exchange effect is accurately controlled.

[0057] The water supply system includes an electronic water treatment instrument 66, a primary liquid level transmitter 16, a primary check valve 17, a primary water supply regulating valve 11, a secondary liquid level transmitter 18, a secondary check valve 20, and a secondary water supply regulating valve 13;

[0058] The level transmitter on the pressure-surge tank is linked to the water supply regulating valve, ensuring a continuous and stable supply of spray water to the spray system, ensuring the stability of the heat exchange effect. At the same time, an electronic water treatment device 66 is installed in the water supply system to prevent scaling, corrosion, and microbial growth in the spray water system. This prevents scaling and corrosion on the plates, ensuring a good heat exchange effect.

[0059] The first-level pressure stabilizing tank 15 is connected to the first-level pressure gas 1002 and the first-level spray water supply 1003 respectively; the second-level pressure stabilizing tank 19 is connected to the second-level pressure gas 1004 and the second-level spray water supply 1005 respectively;

[0060] The spray system is arranged on one side of the heat exchange unit, and the spray system includes a first-level spray pipe 4, a second-level spray pipe 6, a nozzle 14, a mist collector 2, and a water collecting tank 8. By arranging the spray pipes in stages, the spray water volume can be adjusted according to the outlet temperature requirements of the medium in different heat exchange sections, and the water-saving effect is good.

[0061] The primary pressure gas 1002 and the primary spray water 1003 are mixed in the primary pressure stabilizing tank 15 and then transported to the primary spray pipe 4 of the spray system, and then sprayed from the nozzle 14 to the heat exchange unit. The secondary pressure gas 1004 and the secondary spray water 1005 are mixed in the secondary pressure stabilizing tank 19 and then transported to the secondary spray pipe 6 of the spray system, and then sprayed from the nozzle 14 to the heat exchange unit.

[0062] A mist collector 2 and a fan 1 are provided on the side of the heat exchange unit away from the spray system. The heat exchange unit includes a heat exchange module 52, which includes a first-level heat exchange plate bundle 3 and a second-level heat exchange plate bundle 9 distributed up and down; the heat exchange module 52 is connected to the heat medium 1001.

[0063] The mist collector 2 is made of a 45-degree inclined corrugated plate. The surface of the corrugated plate is made of a hydrophobically modified non-metallic material. It can separate and recover the liquid in the air after heat extraction and at the same time realize the recovery of spray water, which has a good water-saving effect.

[0064] The first-stage pressure stabilizing tank 15 and the second-stage pressure stabilizing tank 19 are respectively provided with a pressure gas connection pipe 35, a pressure gauge connection pipe 36, a safety valve port 53, a liquid level gauge port A54, a liquid level gauge port B55, a sewage outlet 56, a spray water outlet 64, and an inspection manhole 65. By adding an external gas source to the pressure stabilizing tank, the spray water is pressurized and stabilized, the spray effect is stable, and the heat extraction effect is good. The pressure stabilizing tank can separate impurities in the spray water supply, and the spray water quality can be controlled by regular sewage discharge. The external gas source is used to purge the spray pipeline, nozzle, plate, etc. to prevent nozzle clogging and plate scaling.

[0065] The first-level pressure gas 1002 is reduced in pressure by the first-level pressure reducing valve 10 and then connected to the first-level pressure stabilizing tank 15. The first-level spray water 1003 flows through the electronic water treatment instrument 66, the first-level water supply regulating valve 11, and the first-level check valve 17 and then connected to the first-level pressure stabilizing tank 15.

[0066] The secondary pressure gas 1004 is reduced in pressure by the secondary pressure reducing valve 12 and then connected to the secondary pressure stabilizing tank 19. The secondary spray water 1005 flows through the electronic water treatment instrument 66, the secondary water supply regulating valve 13, and the secondary check valve 20 and then connected to the secondary pressure stabilizing tank 19.

[0067] The electronic water treatment device 66 can prevent the spray water from scaling, corrosion and microbial growth. The plates are not easy to scale and corrode, and the heat exchange effect is good.

[0068] The primary temperature measuring element 5 is used to detect the temperature of the heat medium 1001 in the primary heat exchange plate bundle 3, and cooperates with the primary pressure transmitter 37 and the primary water supply regulating valve 11 to adjust the pressure of the spray water delivered by the primary pressure stabilizing tank 15 to the primary spray pipe 4;

[0069] The secondary temperature measuring element 7 is used to detect the temperature of the heat medium 1001 in the secondary heat exchange plate bundle 9, and cooperates with the secondary pressure transmitter 38 and the secondary water supply regulating valve 13 to adjust the spray water pressure delivered by the secondary pressure stabilizing tank 19 to the secondary spray pipe 6.

[0070] Furthermore, the heat exchange module 52 also includes a heat medium inlet pipe 22, a heat medium inlet head 23, a transition cone section 39, an inspection hole 58, a first-level pressure gauge interface 40, a second-level pressure gauge interface 42, a lower head 50, an inspection flange 51, and a condensate pipe 43; it adopts an integrated layout, a modular design, a compact structure, and easy inspection and maintenance.

[0071] The first-stage heat exchange plate bundle 3 is located on the upper side of the second-stage heat exchange plate bundle 9 and is connected as a whole through a transition cone section 39;

[0072] The heat medium 1001 enters the heat exchange module 52 through the heat medium inlet pipe 22, and the spray water sprayed by the nozzle 14 forms cold and humid air with the cold air medium 1009. The heat medium 1001 and the cold and humid air exchange heat through the heat exchange module 52, and form condensate 1007 and non-condensable gas 1008 after the heat exchange. The condensate 1007 and the non-condensable gas 1008 enter the lower head 50. A wire mesh demister 48 is provided in the lower head 50. The material is stainless steel wire or polytetrafluoroethylene wire, which can separate the non-condensable gas 1008 from the condensate 1007, reduce liquid entrainment, and achieve good non-condensable gas separation effect. The non-condensable gas 1008 is discharged from the device through the non-condensable gas pipeline 29, and the condensate 1007 is discharged from the device through the condensate external interface 47 from the condensate pipe 43;

[0073] The fan 1 and the mist collector 2 cooperate with each other to extract the hot air medium 1010 formed after the heat exchange of the cold and wet air from the heat exchange module 52;

[0074] After the spray water has completed heat exchange through the heat exchange module 52, it is collected in the water collecting tank 8 to become spray water return water 1006, and the spray water return water 1006 is used for spraying and heat exchange again.

[0075] The heat transfer element of the first-stage heat exchange plate bundle 3 is a condensing plate; the heat transfer element of the second-stage heat exchange plate bundle 9 is a cooling plate. The condensing plates and the cooling plates have the same plate width, different stacking thicknesses, and the same plate structure. They adopt a bubbling plate structure, and the bubbling points are arranged in a 60° equilateral triangle. The plate material is stainless steel, and the surface is sprayed with modified nano-anticorrosive coating, which has good corrosion resistance. The heat exchange module can realize flexible design of heat exchange area for different heat exchange functions, with good processability and strong corrosion resistance.

[0076] The nozzle 14 consists of a connecting section 61, a flow stabilizing section 62, and a rectifying section 63. The connecting section 61 adopts a threaded connection form. The length of the flow stabilizing section 62 is 2:1 with the length of the rectifying section 63. The rectifying section 63 is conical with a cone angle of 120 degrees. It is easy to install on site and has a good spraying effect.

[0077] It also includes a bottom skid 30, a box top 24, a front lifting lug 31, a rear lifting lug 28, a front shutter 25, a rear shutter 26, and an access door 60;

[0078] The present invention uses the heat exchange module 52 as the boundary, with all pipes and external connections arranged on one side as the piping area. The control cabinet 12, fan 1, and access door 60 are arranged on the other side as the operation area. This clearly demarcates the areas and facilitates on-site operation and maintenance. All components can be prefabricated and assembled in the factory, allowing for integrated transportation and easy on-site installation.

[0079] A liquid collecting box 46 is provided on the bottom skid 30, and a filter screen 59 is provided on the liquid collecting box. The skid surface of the bottom skid 30 is inclined toward the liquid collecting box 46, which can reduce water accumulation on the skid surface and achieve high-quality recovery of spray water. The box-type design can reduce evaporation and splashing of spray water, prevent white fog in summer and ice in winter, and has good water-saving and environmental protection performance as a whole.

Claims

1. An environmentally friendly plate-type wet air cooler, comprising a control system, a pressure regulating system, a spraying system, a water supply system, and a heat exchange unit, characterized in that: The control system is integrated in the control cabinet; The pressure regulating system includes a primary pressure reducing valve, a secondary pressure reducing valve, a primary pressure stabilizing tank, a secondary pressure stabilizing tank, a primary temperature measuring element, a secondary temperature measuring element, a primary pressure transmitter, and a secondary pressure transmitter; The water supply system includes an electronic water treatment instrument, a first-level liquid level transmitter, a first-level check valve, a first-level water supply regulating valve, a second-level liquid level transmitter, a second-level check valve, and a second-level water supply regulating valve; The first-level pressure stabilizing tank is connected to the first-level pressure gas and the first-level spray water supply respectively; the second-level pressure stabilizing tank is connected to the second-level pressure gas and the second-level spray water supply respectively; The spray system is arranged on one side of the heat exchange unit, and the spray system includes a primary spray pipe, a secondary spray pipe, a nozzle, a mist catcher, and a water collecting tank; The first-level pressure gas and the first-level spray water are mixed in the first-level pressure stabilizing tank and then transported to the first-level spray pipe of the spray system, and sprayed from the nozzle to the heat exchange unit; the second-level pressure gas and the second-level spray water are mixed in the second-level pressure stabilizing tank and then transported to the second-level spray pipe of the spray system, and sprayed from the nozzle to the heat exchange unit; The heat exchange unit is provided with a mist collector and a fan on the side away from the spray system. The heat exchange unit includes a heat exchange module, which includes a first-level heat exchange plate bundle and a second-level heat exchange plate bundle distributed up and down; the heat exchange module is connected to the heat medium; The first-level pressure stabilizing tank and the second-level pressure stabilizing tank are respectively provided with a pressure gas connection pipe, a pressure gauge connection pipe, a safety valve port, a liquid level gauge port A, a liquid level gauge port B, a sewage outlet, a spray water outlet, and an inspection manhole; The first-level pressure gas is reduced in pressure by the first-level pressure reducing valve and then connected to the first-level pressure stabilizing tank. The first-level spray water flows through the electronic water treatment instrument, the first-level water supply regulating valve, the first-level check valve and then connected to the first-level pressure stabilizing tank. The secondary pressure gas is reduced in pressure by the secondary pressure reducing valve and then connected to the secondary pressure stabilizing tank. The secondary spray water flows through the electronic water treatment instrument, the secondary water supply regulating valve, the secondary check valve and then connected to the secondary pressure stabilizing tank. The first-level temperature measuring element is used to detect the temperature of the heat medium in the first-level heat exchange plate bundle, and cooperates with the first-level pressure transmitter and the first-level water supply regulating valve to adjust the spray water pressure delivered from the first-level pressure regulating tank to the first-level spray pipe; The secondary temperature measuring element is used to detect the temperature of the heat medium in the secondary heat exchange plate bundle, and cooperates with the secondary pressure transmitter and the secondary water supply regulating valve to adjust the spray water pressure delivered from the secondary pressure regulating tank to the secondary spray pipe; The heat exchange module also includes a heat medium inlet pipe, a heat medium inlet head, a transition cone section, an inspection hole, a first-level pressure gauge interface, a second-level pressure gauge interface, a lower head, an inspection flange, and a condensate pipe; The first-stage heat exchange plate bundle is located on the upper side of the second-stage heat exchange plate bundle and is connected as a whole through a transition cone section; The hot medium enters the heat exchange module through the hot medium inlet pipe, and the spray water sprayed by the nozzle forms cold and wet air with the cold air medium. The hot medium and the cold and wet air exchange heat through the heat exchange module, and condensate and non-condensable gas are formed after the heat exchange, and the condensate and non-condensable gas enter the lower head. A wire mesh demister is provided in the lower head. The material is stainless steel wire or polytetrafluoroethylene wire, which can realize the separation of non-condensable gas and condensate. The non-condensable gas is discharged from the non-condensable gas pipeline, and the condensate is discharged from the condensate pipe through the condensate external interface. The fan and the mist collector cooperate with each other to extract the hot air medium formed after the heat exchange of the cold and wet air from the heat exchange module; After the spray water has completed the heat exchange through the heat exchange module, it is collected in the water collecting tank and becomes spray water return water, which is used for spraying and heat exchange again.

2. The environmentally friendly plate-type wet air cooler according to claim 1, characterized in that: The heat transfer elements of the first-stage heat exchange plate bundle are condensing plates; the heat transfer elements of the second-stage heat exchange plate bundle are cooling plates.

3. The environmentally friendly plate-type wet air cooler according to claim 2, characterized in that: The nozzle consists of a connecting section, a flow stabilizing section, and a flow rectifying section. The connecting section adopts a threaded connection form. The length of the flow stabilizing section is 2:1 to the length of the flow rectifying section. The flow rectifying section is conical with a cone angle of 120 degrees.

4. The environmentally friendly plate-type wet air cooler according to claim 3, characterized in that: It also includes skid bottom, box top, front lifting lugs, rear lifting lugs, front shutters, rear shutters, and access doors; The bottom skid is provided with a liquid collecting box, the liquid collecting box is provided with a filter screen, and the skid surface of the bottom skid is inclined toward the liquid collecting box.

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