CN113274866B

CN113274866B - Wall-flow-proof high-efficiency packed tower

Info

Publication number: CN113274866B
Application number: CN202110730134.9A
Authority: CN
Inventors: 于景发; 王佳; 姜绍庆; 陈霄; 董建设; 王东; 张新民; 张晓霞
Original assignee: Shandong Yite Equipment Manufacturing Co ltd
Current assignee: Shandong Yite Equipment Manufacturing Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-08-19
Anticipated expiration: 2041-06-29
Also published as: CN113274866A

Abstract

The invention relates to a wall-flow-preventing efficient packed tower, and belongs to the field of towers. Including the tower body, the tower body lower part sets up collects the fill, collects fill bottom intercommunication drain pipe, collects and fights the top and sets up the intake pipe, and the tower body top sets up the gas outlet, and tower body upper portion sets up the feed liquor pipe, and feed liquor union coupling shower head sets up the filler in the tower body, and filler and tower body inner wall have certain clearance, and the filler upper end sets up spacing dish, and spacing dish is the awl shell form, and the shower head is located spacing dish central point and puts, and spacing dish lower extreme edge will pack the cladding. The generation of wall flow can be effectively avoided, the reaction efficiency of liquid and gas is improved, and the space in the tower is fully utilized.

Description

Wall-flow-proof high-efficiency packed tower

Technical Field

The invention relates to a wall-flow-preventing efficient packed tower, and belongs to the field of towers.

Background

The filler absorption tower is an extremely important chemical energy-saving device, and uses the filler in the tower as a mass transfer device of a gas-liquid two-phase contact member, and the filler tower plays an important role in chemical industry, petroleum industry, environmental protection and other industrial production. A complete packed column comprises column internals and packing, the internals of the packed column being an important component of the entire packed column, the function of the internals being to allow better contact between the gas and the liquid in the packed column in order to achieve maximum efficiency and productivity of the packed column. The internal parts of the packed tower mainly comprise a demister on the top of the tower, a liquid distributor, a packing upper pressure grid plate, a packing support grid plate and the like, and the performance of the packing performance and the efficiency of the whole packed tower are directly influenced by the quality of the design of the internal parts. The liquid flows from top to bottom along the surface of the packing and the gas and liquid are in counter-current or co-current flow, depending on the particular reaction.

The packed column is filled with various shapes of packing (called packing) to make liquid flow along the surface of the packing to form a liquid film, and the liquid film is dispersed in continuously flowing gas, and the gas-liquid two-phase contact surface is on the surface of the liquid film of the packing. The liquid phase is in reverse contact with the gas phase in the downward flowing process, the liquid flows to the tower wall in the downward flowing process, and meanwhile, the liquid wall flows with low gas phase resistance to form wall flow. The current method for solving the wall flow is to use a redistributor, for example, a patent with the patent number of cn201320130257.x, to redistribute the collected wall flow liquid. However, the redistributor occupies a part of the space in the tower, so that the filler is reduced, the treatment efficiency is reduced, and the liquid collected by the redistributor can be accumulated at the edge of the filler, so that the liquid utilization rate is reduced.

Disclosure of Invention

According to the defects in the prior art, the technical problems to be solved by the invention are as follows: the wall flow preventing efficient packed tower can effectively avoid wall flow, improve the reaction efficiency of liquid and gas and fully utilize the space in the tower.

The wall-flow-preventing efficient packed tower comprises a tower body, wherein a collecting hopper is arranged at the lower part of the tower body, the bottom end of the collecting hopper is communicated with a drain pipe, an air inlet pipe is arranged above the collecting hopper, an air outlet is arranged at the top end of the tower body, a liquid inlet pipe is arranged at the upper part of the tower body and is connected with a spray head, packing is arranged in the tower body, a certain gap is reserved between the packing and the inner wall of the tower body, a limiting disc is arranged at the upper end of the packing and is in a conical shell shape, the spray head is positioned at the central position of the limiting disc, and the packing is coated at the edge of the lower end of the limiting disc;

the packing segmentation sets up, every section packs the fixed mount of lower extreme, sets up annular album of liquid ring on the tower body inner wall, and the outer height of album liquid ring is low, and mount and album liquid ring fixed connection set up the liquid trap on the collection liquid ring, and the downthehole sealed fixed elastic membrane of collection liquid, the fixed iron sheet in elastic membrane bottom, the fixed shower nozzle of going up below the elastic membrane, the fixed magnetic ring of exit end of going up the shower nozzle, iron sheet and magnetic ring actuation, the shower nozzle passes through trachea intercommunication air pump.

The working principle and the process are as follows:

when the device works, liquid is introduced into the liquid inlet pipe, the liquid is sprayed on the filler through the spray head, and the filler is coated at the edge of the lower end of the limiting disc, so that liquid drops can be prevented from splashing to the tower wall to form wall flow. The gas is introduced into the gas inlet pipe, the gas moves upwards, the liquid moves downwards, the liquid flows along the surface of the filler to form a liquid film which is dispersed in the continuously flowing gas, and the gas-liquid two-phase contact surface is arranged on the surface of the liquid film of the filler, so that the gas-liquid two-phase reaction achieves the purpose of gas treatment. The liquid flowing down is collected by the collecting hopper and then is discharged from the drain pipe. If there is a certain gap between the filler and the inner wall of the tower body, wall flow is difficult to form on the tower wall. When the packing is used for a long time, the packing collapses or inclines, the packing can contact the tower wall, and in addition, liquid can flow onto the tower wall along the support frame of the tower body to form a small-range wall flow. The liquid flows down the column wall and onto the drip ring, enters the drip holes with the inclined drip ring, and then collects on the elastic membrane. The iron sheet is attracted with the magnetic ring, so that the elastic membrane is in a concave state, and liquid can be retained on the elastic membrane to achieve the purpose of collecting liquid flowing on the wall. The air pump provides high-pressure gas for the upper nozzle, the high-pressure gas is sprayed to overcome the magnetic attraction between the iron sheet and the magnetic ring to eject the elastic film quickly, liquid in the elastic film is thrown onto the filler, and the liquid is absorbed by the filler and participates in the reaction with the gas again, so that the wall flow is thoroughly avoided, and the liquid cannot be accumulated at the contact position of the liquid collecting ring and the filler. The liquid is thrown to the filler, so that the liquid can be uniformly distributed on the filler, the liquid is favorably and fully absorbed by the filler, and secondary wall flow is avoided. After the upper spray head stops spraying, the elastic membrane recovers, the iron sheet and the magnetic ring are attracted and fixed again, and the wall flow liquid is collected again. Need not to set up the redistributor in this application, do not occupy the filler space for the tower body can hold more fillers, improves the two-phase reaction efficiency of gas-liquid. And the gas comes out from a gap between the limiting disc and the tower wall and is discharged from a gas outlet at the upper end of the tower body.

The inner edge of the liquid collecting ring is turned down, a through hole is formed in the turned edge, a screw hole is formed in the periphery of the fixing frame, and the liquid collecting ring is fixedly connected with the fixing frame through bolts. The liquid collecting ring does not influence the installation of the filler and is convenient to disassemble.

The inner edge of the liquid collecting ring is fixed with the swirl plate which is curled outwards, the lower spray head is arranged corresponding to the inner curved surface of the swirl plate, and the lower spray head is communicated with the air pipe. The gap between the filler and the tower body can accumulate a part of gas, high-pressure gas is sprayed to the swirl plate through the lower spray head, the high-pressure gas forms vortex on the surface of the curled swirl plate, the gas in the gap is driven to flow rapidly and irregularly, and then the gas can enter the filler to participate in reaction.

The air pipe is fixed on the inner wall of the tower body and is spirally arranged. The trachea that the heliciform was arranged forms the heliciform air flue, and gaseous is the heliciform and flows in the clearance, has increased gaseous stroke, has improved the contact time of gaseous and filler, does benefit to gaseous entering filler and participates in the reaction.

The upper end of the tower body is provided with a foam removing device which comprises a net rack, the net rack is arranged on the inner wall of the tower body, the net rack is fixed above the limiting disc, the center of the net rack is vertically provided with a rotating shaft, a wire mesh strip is wound on the rotating shaft, a pull rope is further wound on the rotating shaft, one end of the pull rope is fixed at the end part of the wire mesh strip, one end of the pull rope is fixed on the rotating shaft, and a rotary handle is fixed at the upper end of the rotating shaft. After the gas contacts with the liquid through the filler, a plurality of small liquid drops are brought out to form foam, and the quality of gas outlet is influenced. The existing demister is a whole, a cover needs to be opened after blockage, or workers enter the tower body from a manhole to replace or clean, operation is troublesome, high-altitude operation is dangerous to some extent, cleaning is not thorough, and residues after cleaning can enter the tower body and filler to pollute the environment in the tower. In this application, because the silk screen strip is that it is epaxial to coil, can take the silk screen strip out, wash or change outside the tower, need not to uncap, easy operation safety can not pollute the tower internal environment. After cleaning or replacing, the rotating shaft is reversed, the pull rope is wound on the rotating shaft, and the wire mesh strip is pulled by the pull rope and is wound on the rotating shaft again.

The wire mesh strip is a strip-column-shaped body formed by winding a dense steel wire mesh. Therefore, the steel wire mesh does not need to be cut and deeply processed, the production is simple and convenient, and the production cost is reduced.

The tower body is provided with an operation hole, the operation hole corresponds to the position of the silk screen strip, the end part of the silk screen strip is arranged in the operation hole, and the end part of the silk screen strip is fixed with a pull ring. The wire mesh strip can be pulled out through the operation hole, and the wire mesh strip is conveniently pulled out through the pull ring.

The shielding ring is fixed on the inner wall of the tower body and positioned above the wire mesh strip, and the distance from the shielding ring to the net rack corresponds to the diameter of the wire mesh strip. Because the silk screen strip is coiled on the net rack, a certain gap is inevitably formed between the silk screen and the edge of the tower body, and the shielding ring can shield the gap, so that air leakage is avoided, and thorough foam removal is ensured.

The fixed point of the pull rope and the rotating shaft is above the shielding ring. After the pull rope is wound on the rotating shaft, the wound pull rope is arranged above the silk screen strip, and the space of the silk screen strip cannot be occupied.

The air pipe is communicated with the air inlet pipe through an air pump. The components and the density of the ejected gas are the same as those of the gas in the tower, so that the pollution of other gases is avoided and the gas environment in the tower is changed.

Compared with the prior art, the invention has the beneficial effects that:

according to the wall-flow-preventing efficient packed tower, liquid flows down along the wall of the tower, enters the liquid collecting holes along with the inclined liquid collecting ring when flowing onto the liquid collecting ring, and then accumulates on the elastic membrane. The iron sheet is attracted with the magnetic ring, so that the elastic membrane is in a concave state, and liquid can be retained on the elastic membrane to achieve the purpose of collecting wall-flowing liquid. The air pump provides high-pressure gas for the upper nozzle, the high-pressure gas is sprayed to overcome the magnetic attraction between the iron sheet and the magnetic ring to eject the elastic film quickly, liquid in the elastic film is thrown onto the filler, and the liquid is absorbed by the filler and participates in the reaction with the gas again, so that the wall flow is thoroughly avoided, and the liquid cannot be accumulated at the contact position of the liquid collecting ring and the filler. The liquid is thrown to the filler, so that the liquid can be uniformly distributed on the filler, the liquid is favorably and fully absorbed by the filler, and secondary wall flow is avoided. The wire mesh strip can be drawn out and cleaned or replaced outside the tower without uncovering, the operation is simple and safe, and the environment in the tower cannot be polluted. The generation of wall flow can be effectively avoided, the reaction efficiency of liquid and gas is improved, and the space in the tower is fully utilized.

Drawings

FIG. 1 is a schematic view of an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of embodiment A shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of embodiment C shown in FIG. 2;

FIG. 4 is an enlarged view of a portion of embodiment B shown in FIG. 1;

FIG. 5 is a schematic cross-sectional view of the embodiment E-E shown in FIG. 2;

FIG. 6 is a schematic perspective view of a section D-D of the embodiment of FIG. 2;

fig. 7 is a partially enlarged view of the embodiment F shown in fig. 3.

In the figure: 1. a tower body; 2. an operation hole; 3. a wire mesh strip; 4. pulling a rope; 5. a rotating shaft; 6. turning a handle; 7. a shield ring; 8. an air outlet; 9. a liquid inlet pipe; 10. a shower head; 11. a limiting disc; 12. a filler; 13. a fixed mount; 14. a liquid collecting ring; 15. an elastic film; 16. a lower nozzle; 17. an air tube; 18. a bolt; 19. a collecting hopper; 20. a drain pipe; 21. an air inlet pipe; 22. a pull ring; 23. iron sheets; 24. a magnetic ring; 25. an upper spray head; 26. and a liquid collecting hole.

Detailed Description

The present invention will be described more fully hereinafter with reference to the accompanying drawings of embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, by which the invention may be more fully understood; rather, these implementation examples are provided by way of example so that this disclosure will convey the scope of the invention to those skilled in the art. Further, the figures are merely schematic and not drawn to scale, and like numerals refer to like or similar elements or components throughout.

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in fig. 1-7, the wall-flow-preventing efficient packed tower of the present invention comprises a tower body 1, a collecting hopper 19 is arranged at the lower part of the tower body 1, the bottom end of the collecting hopper 19 is communicated with a drain pipe 20, an air inlet pipe 21 is arranged above the collecting hopper 19, an air outlet 8 is arranged at the top end of the tower body 1, an air inlet pipe 9 is arranged at the upper part of the tower body 1, the air inlet pipe 9 is connected with a spray header 10, a packing 12 is arranged in the tower body 1, a certain gap is formed between the packing 12 and the inner wall of the tower body 1, a limiting disc 11 is arranged at the upper end of the packing 12, the limiting disc 11 is in a conical shell shape, the spray header 10 is located at the center of the limiting disc 11, and the lower end edge of the limiting disc 11 covers the packing 12;

12 fillers are arranged in sections, a fixed frame 13 is fixed at the lower end of each section of 12 fillers, an annular liquid collecting ring 14 is arranged on the inner wall of the tower body 1, the liquid collecting ring 14 is high outside and low inside, the fixed frame 13 is fixedly connected with the liquid collecting ring 14, a liquid collecting hole 26 is formed in the liquid collecting ring 14, an elastic film 15 is fixed in the liquid collecting hole 26 in a sealing manner, an iron sheet 23 is fixed at the bottom of the elastic film 15, an upper spray head 25 is fixed below the elastic film 15, a magnetic ring 24 is fixed at the outlet end of the upper spray head 25, the iron sheet 23 is attracted with the magnetic ring 24, and the spray head is communicated with an air pump through an air pipe 17.

The working principle and the process are as follows:

when the device works, liquid is introduced into the liquid inlet pipe 9, the liquid is sprayed on the filler 12 through the spray head 10, and the lower end edge of the limiting disc 11 coats the filler 12, so that liquid drops can be prevented from splashing to the tower wall to form wall flow. The gas is introduced into the gas inlet pipe 21, the gas ascends, the liquid descends, the liquid flows along the surface of the filler 12 to form a liquid film which is dispersed in the continuously flowing gas, the gas-liquid two-phase contact surface is arranged on the surface of the liquid film of the filler 12, and then the gas-liquid two-phase reaction achieves the purpose of gas treatment. The liquid flowing down is collected by the collecting hopper 19 and discharged from the drain pipe 20. The packing 12 has a certain clearance from the inner wall of the tower body 1, so that wall flow on the tower wall is difficult to form. When the packing 12 collapses or tilts after a long time of use, the packing 12 contacts the tower wall, and the liquid flows onto the tower wall along the support frame of the tower body 1 to form a small wall flow. This liquid runs down the column wall and onto the drip ring 14, enters the drip holes with the inclined drip ring 14 and then collects on the elastic membrane 15. The iron sheet 23 is attracted with the magnetic ring 24, so that the elastic membrane 15 is in a concave state, and liquid can be retained on the elastic membrane to achieve the purpose of collecting wall-flowing liquid. The air pump provides high-pressure air for the upper spray head 25, the high-pressure air jet overcomes the magnetic attraction between the iron sheet 23 and the magnetic ring 24 to quickly eject the elastic membrane 15 out, the liquid in the elastic membrane is thrown onto the filler 12, the liquid is absorbed by the filler 12 and participates in the reaction with the air again, the generation of wall flow is thoroughly avoided, and the liquid cannot be accumulated at the contact part of the liquid collecting ring 14 and the filler 12. The liquid is thrown to the packing 12, so that the liquid can be uniformly distributed on the packing 12, the liquid is favorably and fully absorbed by the packing 12, and secondary wall flow is avoided. After the upper nozzle 25 stops spraying, the elastic membrane 15 recovers, the iron sheet 23 and the magnetic ring 24 are attracted and fixed again, and the wall flow liquid is collected again. In the application, a redistributor is not needed to be arranged, and the space of the filler 12 is not occupied, so that the tower body 1 can contain more fillers 12, and the gas-liquid two-phase reaction efficiency is improved. The gas comes out from the gap between the limiting disc 11 and the tower wall and is discharged from the gas outlet 8 at the upper end of the tower body 1.

The inner side of the liquid collecting ring 14 is turned down, a through hole is formed in the turning position, a screw hole is formed in the periphery of the fixing frame 13, and the liquid collecting ring 14 is fixedly connected with the fixing frame 13 through a bolt 18. Thus, the liquid collecting ring 14 does not affect the installation of the packing 12, and is convenient to disassemble.

The inner side of the liquid collecting ring 14 is fixed with a curling plate, the curling plate is curled outwards, a lower spray head 16 is arranged corresponding to the inner curved surface of the curling plate, and the lower spray head 16 is communicated with an air pipe 17. A part of gas is accumulated in the gap between the filler 12 and the tower body 1, high-pressure gas is sprayed to the entrainment plate through the lower spray head 16, the high-pressure gas forms vortex on the surface of the entrainment plate, the gas in the gap is driven to flow rapidly and irregularly, and then the gas can enter the filler 12 to participate in reaction.

The air pipe 17 is fixed on the inner wall of the tower body 1 and is arranged spirally. The air pipes 17 which are arranged spirally form a spiral air passage, and the air flows in the gaps in a spiral shape, so that the travel of the air is increased, the contact time of the air and the filler 12 is prolonged, and the air can enter the filler 12 to participate in reaction.

The upper end of the tower body 1 is provided with a foam removing device, the foam removing device comprises a net rack, the net rack is specified on the inner wall of the tower body 1, the net rack is fixed above the limiting disc 11, the central position of the net rack is vertically provided with a rotating shaft 5, a wire mesh strip 3 is wound on the rotating shaft 5, a pull rope 4 is further wound on the rotating shaft 5, one end of the pull rope 4 is fixed at the end part of the wire mesh strip 3, one end of the pull rope is fixed on the rotating shaft 5, and a rotary handle 6 is fixed at the upper end of the rotating shaft 5. After the gas contacts with the liquid through the packing 12, a plurality of small liquid drops are brought out to form foam, and the quality of the gas outlet is influenced. The existing demister is a whole, a cover needs to be opened after blockage, or workers enter the tower body 1 from a manhole to replace or clean, operation is troublesome, high-altitude operation is dangerous to a certain degree, cleaning is not thorough, and cleaned residues can enter the tower body 1 and filler 12 to pollute the environment in the tower. In this application, because silk screen strip 3 is on coiling pivot 5, can take silk screen strip 3 out, wash or change outside the tower, need not to uncap, easy operation safety can not pollute the tower internal environment. After cleaning or replacement is completed, the rotating shaft 5 is reversed, the rotating shaft 5 is wound around the pulling rope 4, the pulling rope 4 pulls the wire mesh strip 3 and the wire mesh strip 3 is wound on the rotating shaft 5 again.

The wire mesh strip 3 is a strip-column-shaped body formed by winding a dense steel wire mesh. Therefore, the steel wire mesh does not need to be cut and deeply processed, the production is simple and convenient, and the production cost is reduced.

The tower body 1 is provided with an operation hole 2, the operation hole 2 corresponds to the position of the screen strip 3, the end part of the screen strip 3 is arranged in the operation hole 2, and the end part of the screen strip 3 is fixed with a pull ring 22. The wire mesh strip 3 can be pulled out through the operation hole 2, and the pull ring 22 is convenient for pulling out the wire mesh strip 3.

Fixed shading ring 7 on the 1 inner wall of tower body, shading ring 7 is located silk screen strip 3 top, and the distance that blocks ring 7 and rack corresponds with the diameter of silk screen strip 3. Because the silk screen strip 3 is coiled on the net rack, the silk screen has certain clearance with the edge of the tower body 1 inevitably, and the shielding ring 7 can shield the clearance, thereby avoiding air leakage and ensuring thorough foam removal.

The fixed point of the pull rope 4 and the rotating shaft 5 is above the shielding ring 7. After the pull rope 4 is wound on the rotating shaft 5, the wound pull rope 4 is arranged above the silk screen strips 3, and the space of the silk screen strips 3 cannot be occupied.

The air pipe 17 is communicated with an air inlet pipe 21 through an air pump. The components and the density of the ejected gas are the same as those of the gas in the tower, so that the pollution of other gases is avoided and the gas environment in the tower is changed.

In the present invention, unless otherwise specifically defined and defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "side," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the devices or components shown must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the scope of the present invention.

In the present invention, unless otherwise explicitly stated or defined, the terms "mounted," "connected," "fixed," "fitted and fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Claims

1. The utility model provides a prevent high-efficient packed column of wall flow which characterized in that: the tower comprises a tower body (1), wherein a collecting hopper (19) is arranged at the lower part of the tower body (1), the bottom end of the collecting hopper (19) is communicated with a drain pipe (20), an air inlet pipe (21) is arranged above the collecting hopper (19), an air outlet (8) is arranged at the top end of the tower body (1), a liquid inlet pipe (9) is arranged at the upper part of the tower body (1), the liquid inlet pipe (9) is connected with a spray head (10), filler (12) is arranged in the tower body (1), a certain gap is formed between the filler (12) and the inner wall of the tower body (1), a limiting disc (11) is arranged at the upper end of the filler (12), the limiting disc (11) is in a conical shell shape, the spray head (10) is positioned at the central position of the limiting disc (11), and the filler (12) is coated at the edge of the lower end of the limiting disc (11);

the packing (12) is arranged in sections, a fixing frame (13) is fixed at the lower end of each section of packing (12), an annular liquid collecting ring (14) is arranged on the inner wall of the tower body (1), the liquid collecting ring (14) is high outside and low inside, the fixing frame (13) is fixedly connected with the liquid collecting ring (14), a liquid collecting hole is formed in the liquid collecting ring (14), an elastic membrane (15) is fixed in the liquid collecting hole in a sealing manner, an iron sheet (23) is fixed at the bottom of the elastic membrane (15), an upper spray head (25) is fixed below the elastic membrane (15), a magnetic ring (24) is fixed at the outlet end of the upper spray head (25), the iron sheet (23) is attracted with the magnetic ring (24), and the spray head is communicated with an air pump through an air pipe (17);

the air pump provides high-pressure air for the upper spray head (25), the high-pressure air jet overcomes the magnetic attraction between the iron sheet (23) and the magnetic ring (24) to quickly eject the elastic membrane (15), the liquid in the elastic membrane is thrown onto the filler (12), the liquid is absorbed by the filler (12) and participates in the reaction with the air again, after the upper spray head (25) stops jetting, the elastic membrane (15) recovers, the iron sheet (23) and the magnetic ring (24) attract and fix again, and the wall flow liquid is collected again;

the upper end of the tower body (1) is provided with a foam removing device, the foam removing device comprises a net rack, the net rack is arranged on the inner wall of the tower body (1), the net rack is fixed above a limiting disc (11), a rotating shaft (5) is vertically arranged at the center of the net rack, a wire mesh strip (3) is wound on the rotating shaft (5), a pull rope (4) is also wound on the rotating shaft (5), one end of the pull rope (4) is fixed at the end part of the wire mesh strip (3), the other end of the pull rope is fixed on the rotating shaft (5), and a rotary handle (6) is fixed at the upper end of the rotating shaft (5);

the wire mesh strip (3) is a strip-column-shaped body formed by winding a dense steel wire mesh.

2. The anti-wall flow high efficiency packed column of claim 1, wherein: the inner side of the liquid collecting ring (14) is turned down, a through hole is formed in the turning position, a screw hole is formed in the periphery of the fixing frame (13), and the liquid collecting ring (14) is fixedly connected with the fixing frame (13) through a bolt (18).

3. The anti-wall-flow high efficiency packed column according to claim 1, wherein: the inner side of the liquid collecting ring (14) is fixed with a curling plate, the curling plate is curled outwards, a lower spray head (16) is arranged corresponding to the inner curved surface of the curling plate, and the lower spray head (16) is communicated with an air pipe (17).

4. The anti-wall flow high efficiency packed column of claim 1, wherein: the air pipe (17) is fixed on the inner wall of the tower body (1) and is arranged in a spiral shape.

5. The anti-wall flow high efficiency packed column of claim 1, wherein: the tower body (1) is provided with an operation hole (2), the operation hole (2) corresponds to the position of the screen strip (3), the end part of the screen strip (3) is arranged in the operation hole (2), and the end part of the screen strip (3) is fixed with a pull ring (22).

6. The anti-wall flow high efficiency packed column of claim 1, wherein: a shielding ring (7) is fixed on the inner wall of the tower body (1), the shielding ring (7) is positioned above the wire mesh strip (3), and the distance from the shielding ring (7) to the net rack corresponds to the diameter of the wire mesh strip (3).

7. The anti-wall-flow high efficiency packed column according to claim 1, wherein: the fixed point of the pull rope (4) and the rotating shaft (5) is above the shielding ring (7).

8. The anti-wall-flow high efficiency packed column according to claim 1, wherein: the air pipe (17) is communicated with the air inlet pipe (21) through an air pump.