Multi-stage heat exchange type lateral air inlet cross-flow cooling tower and multi-stage heat exchange method thereof

Abstract

The invention discloses a multi-stage heat exchange type side air inlet cross-flow cooling tower and a multi-stage heat exchange method thereof, and belongs to the technical field of cooling towers, the multi-stage heat exchange type side air inlet cross-flow cooling tower comprises a cooling main tower body, a main fan, a water distribution mechanism, a filler, an internal circulation auxiliary tower, a water collecting tank, an internal circulation cooling module and an auxiliary fan, an air inlet is formed in one side of the tower wall of the cooling main tower body, and an air outlet is formed in the other side of the tower wall of the cooling main tower body; the other side of the tower wall of the cooling main tower body is communicated with the side wall of the internal circulation auxiliary tower, the main fan, the water distribution mechanism and the filler are arranged in the cooling main tower body from top to bottom, a conical liquid collecting hopper is arranged in the cooling main tower body and located below the filler, the upper end opening of the conical liquid collecting hopper is in sealed connection with the inner wall of the cooling main tower body, and the lower end opening of the conical liquid collecting hopper is in sealed connection with the inner wall of the cooling main tower body. A gas-liquid mixed flow heat exchange pipe is arranged at the lower port of the conical liquid collecting hopper, and a gas-liquid mixed flow heat exchange spiral channel is arranged in the gas-liquid mixed flow heat exchange pipe; the cooling main tower body and the internal circulation auxiliary tower are arranged at the top of the water collecting tank and are in closed connection with the water collecting tank, the auxiliary fan is arranged at an air outlet of the internal circulation auxiliary tower, and the internal circulation cooling module is arranged in the internal circulation auxiliary tower and is used for circularly cooling cooling water in the water collecting tank in the internal circulation auxiliary tower. The multi-stage gas-liquid heat exchange refrigeration mode is adopted, the cooling efficiency is greatly improved, and particularly, the technical scheme that the multi-stage gas-liquid heat exchange mode and the in-tower cooling water circulation gas-liquid heat exchange technology are combined is adopted, so that the cooling tower has a better refrigeration effect.

Description

Technical Field

[0001] The invention relates to cooling equipment for industrial circulating water, in particular to a multi-stage heat exchange type side-inlet cross-flow cooling tower and a multi-stage heat exchange method thereof. Background Art

[0002] The cooling or condensation of process media in the industrial field generally requires circulating water with a lower temperature. After absorbing heat, the circulating water needs to go to the cooling tower to evaporate and dissipate heat for cooling, and then be sent to the heat exchanger again to absorb the heat of the process medium. Cooling towers are divided into two categories: open and closed. In open cooling towers, the circulating water is in direct contact with the air from the environment for heat transfer, and the water quality is poor; while in closed cooling towers, the circulating water does not contact the ambient air, and the water quality is clean. Under the suction of the fan, the air in the environment is sucked into the tower for convective heat exchange with the circulating water in the coil.

[0003] The existing cooling tower has the following defects: first, the existing cooling tower generally adopts a primary gas-liquid heat exchange, and the cooling efficiency is not high; second, the cooling tower filler is usually replaced every three years. The existing filler replacement is manually removed by removing the old filler in the tower, and then inserting new filler in the tower body. This replacement method is not only labor-intensive, but also time-consuming. The long-term replacement operation will affect the normal operation of the production equipment; third, the adaptability to the variable flow of circulating water is poor. Once the flow of circulating water is very small, the circulating water will be unevenly distributed, so that the circulating water cannot be evenly distributed in the water-sprinkling filler, thereby reducing the heat exchange efficiency; fourth, the existing cooling tower forms a water circulation refrigeration method between the cooling tower and the refrigerated device, and the cooling water in the tower adopts a one-way non-circulating refrigeration method, so the heat exchange effect is not good, the heat exchange efficiency is not high, and some cooling towers even waste water resources. Summary of the invention

[0004] In order to solve the above problems, the object of the present invention is to provide a multi-stage heat exchange type side-inlet cross-flow cooling tower with high cooling efficiency and good refrigeration effect and a multi-stage heat exchange method thereof.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A multi-stage heat exchange type side-inlet cross-flow cooling tower comprises a cooling main tower body, a main fan, a water distribution mechanism, a filler, an internal circulation auxiliary tower, a water collection tank, an internal circulation cooling module and an auxiliary fan. An air inlet is arranged on one side of the tower wall of the cooling main tower body, and the other side of the tower wall of the cooling main tower body is connected to the side wall of the internal circulation auxiliary tower. The main fan, the water distribution mechanism and the filler are arranged in the cooling main tower body from top to bottom. A conical liquid collecting hopper is arranged in the cooling main tower body and below the filler. The conical liquid collecting hopper The upper port is sealed and connected to the inner wall of the cooling main tower body, and the lower port of the conical liquid collecting hopper is provided with a gas-liquid mixed flow heat exchange tube, and the gas-liquid mixed flow heat exchange tube is provided with a gas-liquid mixed flow heat exchange spiral channel; the cooling main tower body and the internal circulation auxiliary tower are arranged on the top of the water collecting pool and are tightly connected to the water collecting pool, the auxiliary fan is arranged at the exhaust port of the internal circulation auxiliary tower, and the internal circulation cooling module is arranged in the internal circulation auxiliary tower, which is used to circulate and cool the cooling water in the water collecting pool in the internal circulation auxiliary tower.

[0006] Furthermore, the water distribution mechanism adopts a scattering water distribution mechanism, which includes a boost vertical pipe, a spherical shell, a pipe joint, an axis mounting frame, a vertical shaft, a turbine, a pressure reducing external expansion pipe and a scattering disk. The pipe joint is connected to the top of the spherical shell, the bottom of the spherical shell is connected to the upper end of the boost vertical pipe, the lower end of the boost vertical pipe is connected to the pressure reducing external expansion pipe, the axis mounting frame is arranged in the spherical shell, the boost vertical pipe is provided with the vertical shaft, the upper end of the vertical shaft passes through the upper port of the boost vertical pipe and is installed on the axis mounting frame through a bearing, the lower end of the vertical shaft passes through the boost vertical pipe and the pressure reducing external expansion pipe and is connected to the center of the disk surface of the scattering disk, the turbine is installed on the vertical shaft and close to the lower port of the boost vertical pipe, the pipe joint is connected to a circulating water delivery pipeline, and a circulating water delivery pump is provided on the circulating water delivery pipeline.

[0007] Furthermore, the internal circulation cooling module includes an internal circulation pump, a cooling water delivery pipe, a flat wall type roundabout heat exchange coil, a cooling water collecting tray and an internal circulation cooling filler. The flat wall type roundabout heat exchange coil is installed at the connecting point between the cooling main tower body and the internal circulation auxiliary tower. One end of the cooling water delivery pipe is located in the water collecting tank, and the other end of the cooling water delivery pipe is connected to the water inlet end of the flat wall type roundabout heat exchange coil. The water outlet end of the flat wall type roundabout heat exchange coil extends into the cooling water collecting tray. The internal circulation pump is arranged on the cooling water delivery pipe. A spray mechanism is connected to the bottom of the cooling water collecting tray, and the spray mechanism is located above the internal circulation cooling filler.

[0008] Furthermore, a guide groove is provided in the cooling main tower body and below the gas-liquid mixed flow heat exchange tube, and the guide groove is used to guide the cooling water into the cooling water collection tray.

[0009] Furthermore, the packing in the cooling main tower body adopts nested cylindrical modular packing, which includes multiple cylindrical packings and core shafts of different diameters. The multiple cylindrical packings of different diameters are assembled in a concentric circle manner, and an annular air-liquid heat exchange channel is formed between adjacent cylindrical packings. The core shaft is inserted into the innermost cylindrical packing, and the core shaft is provided with an air-liquid heat exchange channel along the axial line; the top of the nested cylindrical modular packing gradually decreases in height from the outermost cylindrical packing to the innermost cylindrical packing, and the top surface forms a groove-like structure with high edge and low middle.

[0010] Furthermore, the inner surface of the cylindrical filler has multiple rows of long strip protrusion groups distributed from top to bottom, and the long strip protrusion groups are composed of multiple long strip protrusions distributed at intervals. The long strip protrusions are inclined and are neither parallel nor perpendicular to the axis of the cylindrical filler; the inclination direction of the long strip protrusion group in the upper row is opposite to that of the long strip protrusion group in the adjacent lower row.

[0011] Furthermore, the nested cylindrical modular filler is installed in a protective net frame, and rollers are provided at the bottom of the protective net frame; a filler replacement door is provided on the tower wall of the cooling main tower body, a maintenance platform is provided on the outside of the cooling main tower body, and a load-bearing guide rail is provided inside the cooling main tower body. The protective net frame is supported on the load-bearing guide rail by rollers, and the filler replacement door is opened. Under the action of external force, the protective net frame can be moved along the load-bearing guide rail to the maintenance platform.

[0012] Furthermore, a water guiding mechanism is provided between the water distribution mechanism and the filler in the cooling main tower body. The water guiding mechanism is an annular ring structure with an eight-shaped longitudinal section. The large opening at the upper end of the annular ring is in close contact with the inner wall of the cooling main tower body and is sealed with the inner wall of the cooling main tower body, and the small opening at the lower end of the annular ring is flush with the inner wall of the outermost cylindrical filler of the nested cylindrical modular filler.

[0013] Furthermore, a plurality of circulating water scattering strips are distributed radially on the surface of the scattering disk.

[0014] The cooling method of the multi-stage heat exchange side-inlet cross-flow cooling tower comprises the following steps: Step A, guiding the air heat exchange medium in the cooling main tower body and the internal circulation auxiliary tower: start the main fan and the auxiliary fan, the external air heat exchange medium enters the cooling main tower body through the air inlet on the side wall of the cooling main tower body, a part of the air flow enters the conical liquid collecting hopper through the gas-liquid mixed flow heat exchange tube, and then flows through each ring air-liquid heat exchange channel on the nested cylindrical modular filler, and finally is discharged from the main fan to the outside of the cooling main tower body; the other part of the air flow, under the action of the auxiliary fan, enters the internal circulation auxiliary tower through the flat wall type roundabout heat exchange coil in sequence, and then passes through the internal circulation cooling filler and is discharged from the exhaust port of the internal circulation auxiliary tower; Step B, diversion of cooling water in the cooling main tower body: start the circulating water delivery pump, under the action of the circulating water delivery pump, the cooling water in the circulating water delivery pipeline passes downward through the pipe joint, shaft mounting frame and spherical shell of the scattering water distribution mechanism, flows into the booster vertical pipe after being boosted, and then flows to the turbine of the vertical shaft. Under the impact of the cooling water, the turbine drives the vertical shaft to rotate, and the vertical shaft drives the scattering disk to rotate. The cooling water flows downward through the turbine and the pressure reducing outer expansion pipe to the scattering disk. The rotating scattering disk scatters the circulating water onto the inner wall of the cooling main tower body; Step C, guiding cooling water to the nested cylindrical modular fillers in the cooling main tower body: the cooling water flows downward along the inner wall of the cooling main tower body to the water guiding mechanism, and flows to the edge of the top of the nested cylindrical modular fillers through the water guiding mechanism; Step D, flow distribution of cooling water on the nested cylindrical modular packing: cooling water flows from the edge of the groove-shaped structure at the top of the nested cylindrical modular packing along the groove wall to the middle of the groove, and the circulating water is distributed to each ring air-liquid heat exchange channel; Step E, the first gas-liquid heat exchange in the cooling main tower body: in the cooling main tower body, the cooling water flows in a circuitous manner along the long strip protrusions in the long strip protrusion group in each ring air-liquid heat exchange channel of the nested cylindrical modular packing, and the cooling water performs the first gas-liquid heat exchange with the air heat exchange medium during the flow; Step F, the second gas-liquid heat exchange in the cooling main tower body: in the cooling main tower body, the cooling water after the first gas-liquid heat exchange flows out from the air-liquid heat exchange channels of each ring of the nested cylindrical modular packing, and then collects downward on the conical collecting hopper. The cooling water flows from the conical collecting hopper into the gas-liquid mixed flow heat exchange tube. In the process of the cooling water flowing along the gas-liquid mixed flow heat exchange spiral channel in the gas-liquid mixed flow heat exchange tube, the cooling water performs the second gas-liquid heat exchange with the air heat exchange medium, and the heat carried by the cooling water is taken away by the air heat exchange medium. Step G, guiding the cooling water in the cooling main tower body to the circulating water collection tray in the inner circulation auxiliary tower: the cooling water in the cooling main tower body after the second gas-liquid heat exchange discharged from the gas-liquid mixed flow heat exchange tube is guided to the cooling water collection tray in the inner circulation auxiliary tower through the guide groove; Step H, the third gas-liquid heat exchange in the inner circulation auxiliary tower: the cooling water after the second gas-liquid heat exchange in the cooling water collecting tray in the inner circulation auxiliary tower flows downwardly onto the inner circulation cooling filler through the spray mechanism, the cooling water performs the third gas-liquid heat exchange with the air heat exchange medium in the inner circulation cooling filler, the heat carried by the cooling water is taken away by the air heat exchange medium, and the cooling water discharged from the inner circulation cooling filler flows downwardly into the water collecting tank; Step M, repeatedly performing internal circulation gas-liquid heat exchange in the internal circulation auxiliary tower: start the internal circulation pump, under the action of the internal circulation pump, the cooling water in the water collection tank is sequentially returned to the water collection tank through the cooling water delivery pipe, the flat wall type roundabout heat exchange coil, the cooling water collection tray, the spray mechanism, and the internal circulation cooling filler, thereby forming a cooling water internal circulation channel, in which the cooling water repeatedly circulates, and performs internal circulation gas-liquid heat exchange through the flat wall type roundabout heat exchange coil and the internal circulation cooling filler.

[0015] The beneficial effects of the present invention are: The present invention adopts a multi-stage gas-liquid heat exchange refrigeration method, which greatly improves the cooling efficiency. In particular, it adopts a technical solution combining the multi-stage gas-liquid heat exchange method with the gas-liquid heat exchange technology of cooling water circulation in the tower, which can make the cooling tower have a better refrigeration effect.

[0016] The filler of the present invention adopts nested cylindrical modular filler. When replacing the filler, the nested cylindrical modular filler can be directly taken out from the cooling main tower body as a whole, which solves the problem of large labor workload and long replacement time caused by replacing a single filler in a narrow cooling main tower body. In particular, the nested cylindrical modular filler is installed in a protective net frame, and the protective net frame is supported on the bearing guide rail by rollers, which further improves the replacement efficiency. After opening the filler replacement door, the staff can move the protective net frame along the bearing guide rail to the maintenance platform, remove the old nested cylindrical modular filler by a crane, and move the new nested cylindrical modular filler to the maintenance platform. The staff pushes it into the cooling main tower body and closes the filler replacement door. The replacement time of the present invention does not exceed 3 minutes at most. Compared with the existing technology that requires several hours for replacement, it has obvious advantages, basically does not affect the normal operation of the cooling tower, and can ensure the continuous operation of the production equipment cooled by the cooling tower.

[0017] The top surface of the nested cylindrical modular packing of the present invention adopts a groove-shaped structure. The circulating water flows from the edge of the groove-shaped structure at the top of the nested cylindrical modular packing along the groove wall to the middle of the groove. The circulating water is distributed to each ring air-liquid heat exchange channel. This structure distributes water more evenly.

[0018] In order to adapt to the structural changes of the nested cylindrical modular fillers, the present invention also specially develops a matching scattering water distribution mechanism, which does not require electric drive, has no new energy loss, and has the characteristics of energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described with the aid of the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other accompanying drawings according to the following drawings without creative work: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 The structural schematic diagram of the scattering water distribution mechanism shown; Figure 3 for Figure 2 Schematic diagram of the structure of the scattering disk shown.

[0020] Figure 4 for Figure 1 A longitudinal section of the packing shown; Figure 5 for Figure 1 a perspective view of the packing shown; Figure 6 for Figure 5 An expanded view of the cylindrical packing shown; Figure 7 The present invention is a flow chart of the multi-stage heat exchange method.

[0021] In the figure: 1. cooling main tower; 2. main fan; 3. water distribution mechanism; 4. filler; 5. internal circulation auxiliary tower; 6. water collection tank; 7. internal circulation cooling module; 8. auxiliary fan; 9. conical liquid collecting bucket; 10. gas-liquid mixed flow heat exchange tube; 11. gas-liquid mixed flow heat exchange spiral channel; 12. exhaust port; 13. air inlet; 14. internal circulation pump; 15. cooling water delivery pipe; 16. flat wall type roundabout heat exchange coil; 17. cooling water collection tray; 18. internal circulation cooling filler; 19. spray mechanism; 20. guide groove; 21. booster riser; 22. spherical shell ; 23. Pipe joint; 24. Shaft mounting frame; 25. Vertical shaft; 26. Turbine; 27. Pressure reducing expansion pipe; 28. Scattering disk; 29. ​​Bearing; 30. Circulating water delivery pipeline; 31. Circulating water delivery pump; 32. Circulating water scattering strip; 33. Protective net frame; 34. Roller; 35. Filler replacement door; 36. Maintenance platform; 37. Load-bearing guide rail; 38. Water guiding mechanism; 39. Cylindrical filler; 40. Mandrel; 41. Annular air-liquid heat exchange channel; 42. Air-liquid heat exchange channel; 43. Groove-shaped structure; 44. Long strip protrusion group; 45. Long strip protrusion. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "forward", "reverse", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] like Figure 1 , 2 As shown in Figure 3, a multi-stage heat exchange type side-inlet cross-flow cooling tower comprises a cooling main tower body 1, a main fan 2, a water distribution mechanism 3, a filler 4, an internal circulation auxiliary tower 5, a water collecting tank 6, an internal circulation cooling module 7 and an auxiliary fan 8. An air inlet 13 is arranged on one side of the tower wall of the cooling main tower body 1, and the other side of the tower wall of the cooling main tower body 1 is connected to the side wall of the internal circulation auxiliary tower 5. The main fan 2, the water distribution mechanism 3 and the filler 4 are arranged in the cooling main tower body 1 from top to bottom. A conical liquid collecting hopper 9 is arranged in the cooling main tower body 1 and below the filler 4. The conical collecting hopper 9 The upper port of the liquid hopper 9 is sealed and connected to the inner wall of the cooling main tower body 1, and the lower port of the conical liquid collecting hopper 9 is provided with a gas-liquid mixed flow heat exchange tube 10, and the gas-liquid mixed flow heat exchange tube 10 is provided with a gas-liquid mixed flow heat exchange spiral channel 11; the cooling main tower body 1 and the internal circulation auxiliary tower 5 are arranged on the top of the water collecting pool 6 and are tightly connected to the water collecting pool 6, the auxiliary fan 8 is arranged at the exhaust port 12 of the internal circulation auxiliary tower 5, and the internal circulation cooling module 7 is arranged in the internal circulation auxiliary tower 5, which is used to circulate and cool the cooling water in the water collecting pool 6 in the internal circulation auxiliary tower 5.

[0025] The gas-liquid mixed flow heat exchange tube 10 has two functions: one is to perform gas-liquid mixed flow heat exchange; the other is that after the air flow enters the cooling main tower body 1 from the air inlet 13, it flows upward through the gas-liquid mixed flow heat exchange tube 10 in the middle of the cooling main tower body 1, which can change the air flow distribution in the cooling main tower body 1 and make the air flow more evenly distributed in the filler.

[0026] The internal circulation cooling module 7 includes an internal circulation pump 14, a cooling water delivery pipe 15, a flat wall type roundabout heat exchange coil 16, a cooling water collecting tray 17 and an internal circulation cooling filler 18. The flat wall type roundabout heat exchange coil 16 is installed at the connection between the cooling main tower body 1 and the internal circulation auxiliary tower 5. One end of the cooling water delivery pipe 15 is located in the water collecting tank 6. The other end of the cooling water delivery pipe 15 is connected to the water inlet end of the flat wall type roundabout heat exchange coil 16. The water outlet end of the flat wall type roundabout heat exchange coil 16 extends into the cooling water collecting tray 17. The internal circulation pump 14 is arranged on the cooling water delivery pipe 15. The bottom of the cooling water collecting tray 17 is connected to a spray mechanism 19, and the spray mechanism 19 is located above the internal circulation cooling filler 18. A guide groove 20 is provided in the cooling main tower body 1 and below the gas-liquid mixed flow heat exchange tube 10, and the guide groove 20 is used to guide the cooling water flowing out of the gas-liquid mixed flow heat exchange tube 10 into the cooling water collecting tray 17. The present invention adopts a multi-stage gas-liquid heat exchange refrigeration method, which greatly improves the cooling efficiency, especially the technical solution of combining the multi-stage gas-liquid heat exchange method with the gas-liquid heat exchange technology of cooling water circulation in the tower, which can make the cooling tower have a better refrigeration effect.

[0027] The water distribution mechanism 3 adopts a scattering water distribution mechanism, which includes a booster vertical pipe 21, a spherical shell 22, a pipe joint 23, an axis mounting frame 24, a vertical shaft 25, a turbine 26, a pressure reducing outer expansion pipe 27 and a scattering plate 28. The pipe joint 23 is connected to the top of the spherical shell 22, the bottom of the spherical shell 22 is connected to the upper end of the booster vertical pipe 21, the lower end of the booster vertical pipe 21 is connected to the pressure reducing outer expansion pipe 27, the axis mounting frame 24 is arranged in the spherical shell 22, and the booster vertical pipe 21 is provided with a The vertical shaft 25, the upper end of which passes through the upper port of the boost vertical pipe 21 and is installed on the shaft mounting frame 24 through the bearing 29, the lower end of which passes through the boost vertical pipe 21 and the pressure reducing outer expansion pipe 27 and is connected to the center of the disk surface of the scattering disk 28, the turbine 26 is installed on the vertical shaft 25 and close to the lower port of the boost vertical pipe 21, the pipe joint 23 is connected to the circulating water delivery pipeline 30, and the circulating water delivery pipeline 30 is provided with a circulating water delivery pump 31. A plurality of circulating water scattering strips 32 are distributed radially on the disk surface of the scattering disk. In order to adapt to the structural changes of the nested cylindrical modular packing, the present invention also specially develops a matching scattering water distribution mechanism, which does not need to be powered on, has no new energy loss, and has the characteristics of energy saving and environmental protection.

[0028] The packing 4 in the cooling main tower body is a nested cylindrical modular packing, which is installed in a protective net frame 33, and a roller 34 is provided at the bottom of the protective net frame 33; the wall of the cooling main tower body 1 is provided with a packing replacement door 35, and the outer side of the cooling main tower body 1 is provided with a maintenance platform 36, and a bearing rail 37 is provided inside the cooling main tower body 1. The protective net frame 33 is supported on the bearing rail 37 by rollers 34. When the packing replacement door 35 is opened, the protective net frame 33 can move along the bearing rail 37 to the maintenance platform 36 under the action of external force. A water guide mechanism 38 is also provided between the water distribution mechanism 3 and the packing 4 in the cooling main tower body 1. The water guide mechanism 38 is an annular ring structure with an eight-shaped longitudinal section, the large opening at the upper end of the annular ring is close to the inner wall of the cooling main tower body 1 and is sealed with the inner wall of the cooling main tower body 1, and the small opening at the lower end of the annular ring is flush with the inner wall of the outermost cylindrical packing 39 of the nested cylindrical modular packing. The filler of the present invention adopts nested cylindrical modular filler. When replacing the filler, the nested cylindrical modular filler can be directly taken out from the cooling main tower body as a whole, which solves the problem of large labor workload and long replacement time caused by replacing a single filler in a narrow cooling main tower body. In particular, the nested cylindrical modular filler is installed in a protective net frame, and the protective net frame is supported on the bearing guide rail by rollers, which further improves the replacement efficiency. After opening the filler replacement door, the staff can move the protective net frame along the bearing guide rail to the maintenance platform, remove the old nested cylindrical modular filler by a crane, and move the new nested cylindrical modular filler to the maintenance platform. The staff pushes it into the cooling main tower body and closes the filler replacement door. The replacement time of the present invention does not exceed 3 minutes at most. Compared with the existing technology that requires several hours for replacement, it has obvious advantages, basically does not affect the normal operation of the cooling tower, and can ensure the continuous operation of the production equipment cooled by the cooling tower.

[0029] like Figure 4 , 5 As shown in Figure 6, the nested cylindrical modular packing includes a plurality of cylindrical packings 39 of different diameters and a core shaft 40. The plurality of cylindrical packings 39 of different diameters are assembled in a concentric circle manner, and an annular air-liquid heat exchange channel 41 is formed between adjacent cylindrical packings 39. The core shaft 40 is inserted into the innermost cylindrical packing 39, and an air-liquid heat exchange channel 42 is provided on the core shaft 40 along the axis. The top of the nested cylindrical modular packing decreases in height from the outermost cylindrical packing to the innermost cylindrical packing, and a groove-shaped structure 43 with a high edge and a low middle is formed on the top surface. The top surface of the nested cylindrical modular packing of the present invention adopts a groove-shaped structure, and the circulating water flows from the edge of the groove-shaped structure at the top of the nested cylindrical modular packing along the groove wall to the middle of the groove, and the circulating water is distributed to each annular air-liquid heat exchange channel. This structure distributes water more evenly.

[0030] The inner surface of the cylindrical filler 39 is provided with a plurality of rows of long strip protrusion groups 44 from top to bottom, and the long strip protrusion groups 44 are composed of a plurality of spaced-apart long strip protrusions 45, and the long strip protrusions 45 are inclined, and are neither parallel nor perpendicular to the axis of the cylindrical filler 39; the inclination direction of the upper row of long strip protrusion groups 44 is opposite to that of the adjacent lower row of long strip protrusion groups 44.

[0031] like Figure 7 As shown, the cooling method of the multi-stage heat exchange side-inlet cross-flow cooling tower comprises the following steps: Step A, guiding the air heat exchange medium in the cooling main tower body 1 and the internal circulation auxiliary tower 5: start the main fan 2 and the auxiliary fan 8, and the external air heat exchange medium enters the cooling main tower body 1 through the air inlet 13 on the side wall of the cooling main tower body, and a part of the air flow enters the conical liquid collecting hopper 9 through the gas-liquid mixed flow heat exchange tube 10, and then flows through each ring air-liquid heat exchange channel 41 on the nested cylindrical modular filler, and finally is discharged from the main fan 2 to the outside of the cooling main tower body 1; the other part of the air flow, under the action of the auxiliary fan 8, successively enters the internal circulation auxiliary tower 5 through the flat wall type roundabout heat exchange coil 16, and then passes through the internal circulation cooling filler 18 and is discharged from the exhaust port of the internal circulation auxiliary tower 5.

[0032] Step B, diversion of cooling water in the cooling main tower body 1: start the circulating water delivery pump 31, under the action of the circulating water delivery pump 41, the cooling water in the circulating water delivery pipeline 30 passes downward through the pipe joint 23, the shaft mounting frame 24, and the spherical shell 22 of the scattering water distribution mechanism, flows into the booster vertical pipe 21 for boosting, and then flows to the turbine 26 of the vertical shaft 25. Under the impact of the cooling water, the turbine 26 drives the vertical shaft 25 to rotate, and the vertical shaft 25 drives the scattering disk 28 to rotate. The cooling water flows downward through the turbine 26 through the pressure reducing outer expansion pipe 27 to the scattering disk 28, and the rotating scattering disk 28 scatters the circulating water onto the inner wall of the cooling main tower body 1.

[0033] Step C, guiding cooling water to the nested cylindrical modular packing in the cooling main tower body 1: the cooling water flows downward along the inner wall of the cooling main tower body 1 to the water guiding mechanism 38, and flows to the edge of the top of the nested cylindrical modular packing through the water guiding mechanism 38.

[0034] Step D, flow distribution of cooling water on the nested cylindrical modular packing: the cooling water flows from the edge of the groove-shaped structure 43 at the top of the nested cylindrical modular packing along the groove wall to the middle of the groove, and the circulating water is distributed to each ring air-liquid heat exchange channel 41.

[0035] Step E, the first gas-liquid heat exchange in the cooling main tower body 1: in the cooling main tower body 1, the cooling water flows in a circuitous manner along the long strip protrusions 45 in the long strip protrusion group 44 in each ring air-liquid heat exchange channel 41 of the nested cylindrical modular filler, and the cooling water performs the first gas-liquid heat exchange with the air heat exchange medium during the flow.

[0036] Step F, the second gas-liquid heat exchange in the cooling main tower body 1: in the cooling main tower body 1, the cooling water after the first gas-liquid heat exchange flows out from the air-liquid heat exchange channels 41 of each ring of the nested cylindrical modular filler, and then converges downward onto the conical liquid collecting hopper 9. The cooling water flows from the conical liquid collecting hopper 9 into the gas-liquid mixed flow heat exchange tube 10. In the process of flowing along the gas-liquid mixed flow heat exchange spiral channel 11 in the gas-liquid mixed flow heat exchange tube 10, the cooling water undergoes a second gas-liquid heat exchange with the air heat exchange medium, and the heat carried by the cooling water is taken away by the air heat exchange medium.

[0037] Step G, guiding the cooling water in the cooling main tower body 1 to the circulating water collecting tray in the inner circulation auxiliary tower 5: the cooling water in the cooling main tower body 1 after the second gas-liquid heat exchange discharged from the gas-liquid mixed flow heat exchange tube is guided to the cooling water collecting tray 17 in the inner circulation auxiliary tower 5 through the guide groove 20.

[0038] Step H, the third gas-liquid heat exchange in the internal circulation auxiliary tower: the cooling water after the second gas-liquid heat exchange in the cooling water collecting tray 17 in the internal circulation auxiliary tower 5 flows downwardly through the spray mechanism 19 onto the internal circulation cooling filler 18, and the cooling water undergoes a third gas-liquid heat exchange with the air heat exchange medium in the internal circulation cooling filler 18, and the heat carried by the cooling water is taken away by the air heat exchange medium, and the cooling water discharged from the internal circulation cooling filler 18 flows downwardly into the collecting tank 6.

[0039] Step M, repeatedly performing internal circulation gas-liquid heat exchange in the internal circulation auxiliary tower: start the internal circulation pump 14, under the action of the internal circulation pump 14, the cooling water in the water collecting tank 6 flows back to the water collecting tank 6 in sequence through the cooling water delivery pipe 15, the flat wall type roundabout heat exchange coil 16, the cooling water collecting tray 17, the spray mechanism 19, and the internal circulation cooling filler 18, forming a cooling water internal circulation channel, and the cooling water repeatedly circulates in the cooling water internal circulation channel, and performs internal circulation gas-liquid heat exchange through the flat wall type roundabout heat exchange coil 16 and the internal circulation cooling filler 18.

[0040] In addition, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradiction. Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-stage heat exchange side-inlet cross-flow cooling tower, characterized in that: The invention comprises a cooling tower body, a main fan, a water distribution mechanism, a filler, an internal circulation auxiliary tower, a water collecting pool, an internal circulation cooling module and an auxiliary fan. An air inlet is arranged on one side of the tower wall of the main cooling tower body, and the other side of the tower wall of the main cooling tower body is connected with the side wall of the internal circulation auxiliary tower. The main fan, the water distribution mechanism and the filler are arranged in the cooling tower body from top to bottom. A conical liquid collecting hopper is arranged in the cooling tower body and below the filler. The upper port of the conical liquid collecting hopper is sealed with the inner wall of the cooling tower body. The lower port of the conical liquid collecting hopper is provided with a gas-liquid mixed flow heat exchange tube. A gas-liquid mixed flow heat exchange spiral channel is provided in the gas-liquid mixed flow heat exchange tube. The cooling tower body and the internal circulation auxiliary tower are arranged on the top of the water collecting pool and are tightly connected with the water collecting pool. The auxiliary fan is arranged at the exhaust port of the internal circulation auxiliary tower. The internal circulation cooling module is arranged in the internal circulation auxiliary tower to circulate and cool the cooling water in the water collecting pool in the internal circulation auxiliary tower.

2. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 1 is characterized in that: The water distribution mechanism adopts a scattering water distribution mechanism, which includes a booster riser, a spherical shell, a pipe joint, an axis mounting frame, a vertical shaft, a turbine, a pressure reducing external expansion pipe and a scattering disk. The pipe joint is connected to the top of the spherical shell, the bottom of the spherical shell is connected to the upper end of the booster riser, the lower end of the booster riser is connected to the pressure reducing external expansion pipe, the axis mounting frame is arranged in the spherical shell, the booster riser is provided with the vertical shaft, the upper end of the vertical shaft passes through the upper port of the booster riser and is installed on the axis mounting frame through a bearing, the lower end of the vertical shaft passes through the booster riser and the pressure reducing external expansion pipe and is connected to the center of the disk surface of the scattering disk, the turbine is installed on the vertical shaft and close to the lower port of the booster riser, the pipe joint is connected to a circulating water delivery pipeline, and a circulating water delivery pump is arranged on the circulating water delivery pipeline.

3. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 2 is characterized in that: The internal circulation cooling module includes an internal circulation pump, a cooling water delivery pipe, a flat wall type roundabout heat exchange coil, a cooling water collecting tray and an internal circulation cooling filler. The flat wall type roundabout heat exchange coil is installed at the connecting point between the cooling main tower body and the internal circulation auxiliary tower. One end of the cooling water delivery pipe is located in the water collecting tank, and the other end of the cooling water delivery pipe is connected to the water inlet end of the flat wall type roundabout heat exchange coil. The water outlet end of the flat wall type roundabout heat exchange coil extends into the cooling water collecting tray. The internal circulation pump is arranged on the cooling water delivery pipe. A spray mechanism is connected to the bottom of the cooling water collecting tray, and the spray mechanism is located above the internal circulation cooling filler.

4. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 3 is characterized in that: A guide groove is provided in the cooling main tower body and below the gas-liquid mixed flow heat exchange tube, and the guide groove is used to guide the cooling water into the cooling water collecting tray.

5. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 4, characterized in that: The packing in the cooling main tower body adopts nested cylindrical modular packing, which includes multiple cylindrical packings and core shafts of different diameters. The multiple cylindrical packings of different diameters are assembled in a concentric circle manner, and an annular air-liquid heat exchange channel is formed between adjacent cylindrical packings. The core shaft is inserted into the innermost cylindrical packing, and the core shaft is provided with an air-liquid heat exchange channel along the axial line; the top of the nested cylindrical modular packing decreases in height step by step from the outermost cylindrical packing to the innermost cylindrical packing, and the top surface forms a groove-like structure with high edge and low middle.

6. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 5, characterized in that: The inner surface of the cylindrical filler is provided with multiple rows of long strip protrusion groups from top to bottom, and the long strip protrusion groups are composed of multiple long strip protrusions distributed at intervals. The long strip protrusions are inclined and are neither parallel nor perpendicular to the axis of the cylindrical filler; the inclination direction of the long strip protrusion groups in the upper row is opposite to that of the long strip protrusion groups in the adjacent lower row.

7. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 6, characterized in that: The nested cylindrical modular filler is installed in a protective net frame, and a roller is provided at the bottom of the protective net frame; a filler replacement door is provided on the tower wall of the cooling main tower body, a maintenance platform is provided on the outer side of the cooling main tower body, and a load-bearing guide rail is provided inside the cooling main tower body. The protective net frame is supported on the load-bearing guide rail by rollers, and the filler replacement door is opened. Under the action of external force, the protective net frame can be moved along the load-bearing guide rail to the maintenance platform.

8. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 7, characterized in that: A water guiding mechanism is also provided between the water distribution mechanism and the filler in the cooling main tower body. The water guiding mechanism is an annular ring structure with an eight-shaped longitudinal section. The large opening at the upper end of the annular ring is in close contact with the inner wall of the cooling main tower body and is sealed with the inner wall of the cooling main tower body. The small opening at the lower end of the annular ring is flush with the inner wall of the outermost cylindrical filler of the nested cylindrical modular filler.

9. The multi-stage heat exchange side-inlet cross-flow cooling tower according to claim 8, characterized in that: A plurality of circulating water scattering strips are distributed radially on the disk surface of the scattering disk.

10. The multi-stage heat exchange method of the multi-stage heat exchange type side-inlet cross-flow cooling tower according to claim 9, characterized in that: The following steps are involved: Step A, guiding the air heat exchange medium in the cooling main tower body and the internal circulation auxiliary tower: start the main fan and the auxiliary fan, the external air heat exchange medium enters the cooling main tower body through the air inlet on the side wall of the cooling main tower body, a part of the air flow enters the conical liquid collecting hopper through the gas-liquid mixed flow heat exchange tube, and then flows through each ring air-liquid heat exchange channel on the nested cylindrical modular filler, and finally is discharged from the main fan to the outside of the cooling main tower body; the other part of the air flow, under the action of the auxiliary fan, enters the internal circulation auxiliary tower through the flat wall type roundabout heat exchange coil in sequence, and then passes through the internal circulation cooling filler and is discharged from the exhaust port of the internal circulation auxiliary tower; Step B, diversion of cooling water in the cooling main tower body: start the circulating water delivery pump, under the action of the circulating water delivery pump, the cooling water in the circulating water delivery pipeline passes downward through the pipe joint, shaft mounting frame and spherical shell of the scattering water distribution mechanism, flows into the booster vertical pipe after being boosted, and then flows to the turbine of the vertical shaft. Under the impact of the cooling water, the turbine drives the vertical shaft to rotate, and the vertical shaft drives the scattering disk to rotate. The cooling water flows downward through the turbine and the pressure reducing outer expansion pipe to the scattering disk. The rotating scattering disk scatters the circulating water onto the inner wall of the cooling main tower body; Step C, guiding cooling water to the nested cylindrical modular fillers in the cooling main tower body: the cooling water flows downward along the inner wall of the cooling main tower body to the water guiding mechanism, and flows to the edge of the top of the nested cylindrical modular fillers through the water guiding mechanism; Step D, flow distribution of cooling water on the nested cylindrical modular packing: cooling water flows from the edge of the groove-shaped structure at the top of the nested cylindrical modular packing along the groove wall to the middle of the groove, and the circulating water is distributed to each ring air-liquid heat exchange channel; Step E, the first gas-liquid heat exchange in the cooling main tower body: in the cooling main tower body, the cooling water flows in a circuitous manner along the long strip protrusions in the long strip protrusion group in each ring air-liquid heat exchange channel of the nested cylindrical modular packing, and the cooling water performs the first gas-liquid heat exchange with the air heat exchange medium during the flow; Step F, the second gas-liquid heat exchange in the cooling main tower body: in the cooling main tower body, the cooling water after the first gas-liquid heat exchange flows out from the air-liquid heat exchange channels of each ring of the nested cylindrical modular packing, and then collects downward on the conical collecting hopper. The cooling water flows from the conical collecting hopper into the gas-liquid mixed flow heat exchange tube. In the process of the cooling water flowing along the gas-liquid mixed flow heat exchange spiral channel in the gas-liquid mixed flow heat exchange tube, the cooling water performs the second gas-liquid heat exchange with the air heat exchange medium, and the heat carried by the cooling water is taken away by the air heat exchange medium. Step G, guiding the cooling water in the cooling main tower body to the circulating water collection tray in the inner circulation auxiliary tower: the cooling water in the cooling main tower body after the second gas-liquid heat exchange discharged from the gas-liquid mixed flow heat exchange tube is guided to the cooling water collection tray in the inner circulation auxiliary tower through the guide groove; Step H, the third gas-liquid heat exchange in the inner circulation auxiliary tower: the cooling water after the second gas-liquid heat exchange in the cooling water collecting tray in the inner circulation auxiliary tower flows downwardly onto the inner circulation cooling filler through the spray mechanism, the cooling water performs the third gas-liquid heat exchange with the air heat exchange medium in the inner circulation cooling filler, the heat carried by the cooling water is taken away by the air heat exchange medium, and the cooling water discharged from the inner circulation cooling filler flows downwardly into the water collecting tank; Step M, repeatedly performing internal circulation gas-liquid heat exchange in the internal circulation auxiliary tower: start the internal circulation pump, under the action of the internal circulation pump, the cooling water in the water collection tank is sequentially returned to the water collection tank through the cooling water delivery pipe, the flat wall type roundabout heat exchange coil, the cooling water collection tray, the spray mechanism, and the internal circulation cooling filler, thereby forming a cooling water internal circulation channel, in which the cooling water repeatedly circulates, and performs internal circulation gas-liquid heat exchange through the flat wall type roundabout heat exchange coil and the internal circulation cooling filler.

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