Efficient circulating rectifying tower for liquid purification

Abstract

The invention discloses an efficient circulating type rectifying tower for liquid purification, and belongs to the technical field of liquid purification rectifying towers, the efficient circulating type rectifying tower for liquid purification comprises a tower body for purifying liquid and a supporting frame fixedly installed outside the tower body, and the side of the tower body is connected with a liquid inlet pipe for controlling liquid to enter in a penetrating mode. The lower end of the tower body is communicated and connected with a liquid outlet pipe for controlling liquid to flow out, a reboiler is mounted on the liquid outlet pipe, and a gas inlet pipe for controlling gas to flow is communicated and connected between the reboiler and the tower body; the upper end of the tower body is communicated and connected with an air outlet pipe, a condenser is mounted on the air outlet pipe, a drainage pipe is communicated and connected below the condenser, and a return pipe for conveying condensed water is connected between the drainage pipe and the tower body; upper and lower circulating filtering groups are arranged in the tower body relative to the liquid inlet pipe; the rectifying tower can automatically adjust the gas circulation amount in the tower plates according to the change of the gas pressure in the tower, and gas-liquid balance in the tower is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid purification distillation columns, and specifically to a highly efficient circulating distillation column for liquid purification. Background Art

[0002] A distillation column is a chemical engineering device used for separating and purifying liquid mixtures. The core principle is to utilize the boiling point differences of different components to achieve separation through multiple partial vaporizations and condensations. A distillation column usually consists of a column body, trays or packing, a condenser, a reboiler, etc. Through gas-liquid contact for mass transfer and heat transfer, the separation purpose is achieved. The effect of the distillation column in purifying liquids is affected by the internal tray design.

[0003] For example, the patent with the publication number CN220424573U discloses a purification distillation column for recovering acid, which includes a distillation column. A feed pipe is installed in the middle of the surface of the distillation column. An outlet pipe is connected to the top of the distillation column. A discharge pipe is installed at the bottom of the distillation column. A distillation mechanism is fixedly installed inside the distillation column. A liquid collection mechanism is installed at the bottom of the distillation column. One end of the discharge pipe is fixedly installed with a reboiler. The acid recovery waste liquid flows into the surface of the tray through a downcomer. The waste liquid gradually flows downward through the downcomers connected between the trays. An overflow weir is connected to the surface of the tray. The overflow weir keeps a certain liquid phase height of the waste liquid on the tray, so that a liquid seal is formed between the trays. After the gas passes through the air holes, it forms sufficient gas-liquid contact with the liquid phase on the surface of the tray, ensuring that the acidic liquid in the waste liquid volatilizes into gas. Its structure is simple and easy to maintain, with a large processing capacity and stable efficiency, and has high reliability.

[0004] For example, the patent with the publication number CN213492061U discloses a purification distillation column that can improve the purification accuracy, which includes a column body, multiple packing plates, a spray head and a bottom plate. The outer walls of each packing plate are connected to the inner wall of the column body. The top of the column body is connected to the top of the bottom plate. A filter box is arranged at the top of the bottom plate. A circular plate is connected to the top inner wall of the filter box. A filter screen is fixedly connected to the bottom end of the circular plate. A water outlet pipe is communicated with the right side wall of the filter box. A first water pump is installed at the top of the support plate. The right end of the water outlet pipe is communicated with the input end of the first water pump. The output end of the first water pump is communicated with a spray pipe. A second water pump is installed at the rear part of the top of the filter box. The output end of the second water pump is communicated with a connecting pipe. The front end of the connecting pipe is communicated with a cleaning pipe. The bottom end of the cleaning pipe is communicated with the top end of the filter screen. It can filter the liquid, effectively improve the purification effect, prevent the device from being blocked, and the filtering device can be cleaned, with strong use reliability.

[0005] For another example, the patent with the publication number CN216404304U discloses an efficient purification and stable light hydrocarbon rectification column, which includes a column body. Inside the column body, a partition is fixedly installed. On the right side of the partition, a water receiving tank is fixedly installed. On the left side of the partition, a water blocking plate is fixedly installed. At the bottom of the partition, a mounting seat is fixedly installed. Inside the partition, a rotating paddle is movably installed. At the top of the rotating paddle, a uniformly distributed cap mechanism is communicated. At the bottom of the rotating paddle, a transmission shaft is fixedly installed. On the outer side of the transmission shaft, a fan is fixedly installed. Inside the partition, the rotating paddle is movably connected through a waterproof bearing, and the inside of the rotating paddle is hollow. An air port is opened at the bottom of the rotating paddle. This efficient purification and stable light hydrocarbon rectification column has the advantages of improving efficiency and preventing liquid leakage, and solves the problems that it is difficult to solve the liquid leakage and blockage problems of the plate column, and the gas and liquid cannot be fully mixed for reaction. However, in some existing rectification columns, the pore area of the tower plate is fixed and cannot be adjusted according to actual operation requirements, which limits the operating flexibility of the tower. When the gas phase load or liquid phase load changes, the tower plate cannot respond flexibly, easily leading to the imbalance of gas-liquid equilibrium in the tower. For example, when the gas flow rate is too high, the liquid may not effectively pass through the tower plate and be entrained by the rising gas to the next layer of the tower plate, forming entrainment of mists. If the gas flow rate is too low, it may cause the liquid to leak to the lower layer of the tower plate, forming a flooding phenomenon.

[0006] In view of the above problems, it is urgent to innovate and design on the basis of the original liquid purification rectification column. Summary of the Invention

[0007] The purpose of the present invention is to provide a highly efficient circulating rectification column for liquid purification, so as to solve the problem that in some existing rectification columns, the pore area of the tower plate is fixed and cannot be adjusted according to actual operation requirements, which limits the operating flexibility of the tower. When the gas phase load or liquid phase load changes, the tower plate cannot respond flexibly, easily leading to the imbalance of gas-liquid equilibrium in the tower as mentioned in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A highly efficient circulating rectification column for liquid purification, which includes a column body for purifying liquid and a support frame fixedly installed outside the column body. A liquid inlet pipe for controlling the entry of liquid is connected through the side of the column body. At the lower end of the column body, a liquid outlet pipe for controlling the outflow of liquid is connected through. A reboiler is installed on the liquid outlet pipe. An air inlet pipe for controlling the flow of gas is connected through between the reboiler and the column body. An air outlet pipe is connected through the upper end of the column body. A condenser is installed on the air outlet pipe. A drain pipe is connected through below the condenser. A reflux pipe for transporting condensed water is connected between the drain pipe and the column body. In the column body, there are two sets of upper and lower circulating filtration groups arranged with respect to the liquid inlet pipe.

[0009] Preferably, the circulating filtration group includes a plurality of trays fixedly arranged in the tower body at equal intervals. On one side of the tray that does not contact the tower body, a vertical plate is fixedly connected. The vertical plate is fixedly connected to the two adjacent trays above and below, and a flow groove is formed on the lower end surface of the vertical plate. One side of the tray is in an arc shape and fixedly contacts the inner side of the tower body, and the other side of the tray is in a straight line and does not contact the inner side wall of the tower body, and the two adjacent trays above and below are arranged in a staggered manner.

[0010] Preferably, the circulating filtration group further includes a plurality of air holes opened on the trays at equal intervals. An inner sleeve communicated with the air holes is installed on the upper surface of the tray, and an outer sleeve is connected to the outside of the inner sleeve in a lifting manner. The air holes on the trays distributed longitudinally in a staggered manner correspond to each other up and down. The inner diameter of the outer sleeve is larger than the outer diameter of the inner sleeve.

[0011] Preferably, a sliding sleeve is fixedly installed on the upper end surface of the inner sleeve, a sliding rod is slidably connected in the sliding sleeve, and the sliding rod is fixedly connected to the outer sleeve.

[0012] Preferably, a current-limiting disc is rotatably installed in the inner sleeve. A driven rotating rod is connected along the axis direction of the rotating shaft of the current-limiting disc, and the driven rotating rod is rotatably installed on the outer wall of the inner sleeve. A driving rotating rod is fixedly connected to the inner side wall of the outer sleeve, a transmission rod is rotatably connected to the driving rotating rod, and the other end of the transmission rod is rotatably connected to the driven rotating rod.

[0013] Preferably, a fixed bracket is fixedly installed on the outside of the plurality of outer sleeves. A lifting frame is fixedly installed on one side of the fixed bracket, and the lifting frame longitudinally penetrates and is slidably connected to the tray.

[0014] Preferably, a filtering mechanism for absorbing and filtering harmful components in the gas is arranged on the lower end surface of the tray.

[0015] Preferably, the filtering mechanism includes a sealing cover fixedly installed on the lower end surface of the tray, and the sealing cover covers the lower part of the air hole. A upper net cover is fixedly installed on the lower surface of the sealing cover, and an elastic filler for filtering gas is fixedly installed on the lower end surface of the upper net cover.

[0016] Preferably, a lower net cover for assisting in squeezing out water is connected to the lower part of the elastic filler in a lifting manner. A guiding seat is fixedly installed on the side of the upper net cover, a guiding rod is slidably connected in the guiding seat, and the guiding rod is fixedly connected to the lower net cover. A plurality of air bags are fixedly arranged intermittently in the mesh holes of the lower net cover.

[0017] Preferably, a positioning piece is fixedly sleeved on the outside of the guiding rod, and the positioning piece supports above the guiding seat. The guiding rod on one side of the lower net cover is fixedly connected to the lifting frame.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: In the high-efficiency circulating rectification column for liquid purification, through the upper and lower sets of circulating filtration groups designed in the column body, the liquid entering the column body and the liquid flowing back to the column body can be evenly distributed on the circulating filtration groups, so that the liquid can be fully purified.

[0019] Furthermore, the circulating filtration group includes a column plate for controlling the passage of gas, air holes, an inner sleeve and an outer sleeve. According to the change of air pressure, the outer sleeve can be sleeved outside the inner sleeve and move up and down to preliminarily adjust the gas flow rate.

[0020] And a current-limiting disc is rotatably installed in the inner sleeve. During the up and down movement of the outer sleeve, it can drive the active rotating rod to move up and down synchronously. Under the transmission of the transmission rod and the driven rotating rod, it can control the rotation of the current-limiting disc in the inner sleeve, so as to further adjust the gas flow rate in the air holes and the inner sleeve, and maintain the gas-liquid balance in the column.

[0021] Furthermore, a filtering mechanism for absorbing and filtering harmful components in the gas is arranged on the lower end face of the column plate. The filtering mechanism is arranged below the air holes. Before the gas rises and passes through the air holes, it first contacts the elastic packing in the lower filtering mechanism, so that the gas can be filtered by the elastic packing first, improving the effect of liquid purification.

[0022] According to the change of the gas pressure in the column, the air pressure acts on the lower wire mesh cover, which can push it to move upward, so that the lower wire mesh cover moves up and squeezes the elastic packing, discharging the water absorbed in the elastic packing. The water extruded from the elastic packing can be collected on the next layer of column plate to maintain the liquid circulating filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the column body of the present invention.

[0024] Figure 2 It is a cross-sectional structural schematic diagram of the column body of the present invention.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the column plate of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the vertical plate of the present invention.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the sealing cover of the present invention.

[0028] Figure 6 It is a three-dimensional structural schematic diagram of the outer sleeve of the present invention.

[0029] Figure 7 It is a cross-sectional structural schematic diagram of the inner sleeve of the present invention.

[0030] Figure 8 Schematic diagram of the three-dimensional structure of the current-limiting disc of the present invention.

[0031] Figure 9 Schematic diagram of the three-dimensional structure of the transmission rod of the present invention.

[0032] Figure 10 Schematic diagram of the three-dimensional structure of the upper net cover of the present invention.

[0033] Figure 11 Schematic diagram of the three-dimensional structure of the elastic packing of the present invention.

[0034] Figure 12 Schematic diagram of the three-dimensional structure of the guide rod of the present invention.

[0035] In the figure: 1, tower body; 2, support frame; 3, liquid inlet pipe; 4, liquid outlet pipe; 5, reboiler; 6, gas inlet pipe; 7, gas outlet pipe; 8, condenser; 9, drain pipe; 10, reflux pipe; 11, circulation filtration group; 111, tray; 112, vertical plate; 113, flow groove; 114, air hole; 115, inner sleeve; 116, outer sleeve; 12, sliding sleeve; 13, sliding rod; 14, current-limiting disc; 15, driven rotating rod; 16, driving rotating rod; 17, transmission rod; 18, fixed bracket; 19, lifting frame; 20, sealing cover; 21, upper net cover; 22, elastic packing; 23, lower net cover; 24, guide seat; 25, guide rod; 26, positioning piece; 27, airbag. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1: Please refer to Figures 1-12 , the present invention provides the following technical solutions: A high-efficiency circulating rectifying column for liquid purification, including a tower body 1 for purifying liquid and a support frame 2 fixedly installed outside the tower body 1. A liquid inlet pipe 3 for controlling the entry of liquid is connected through the side of the tower body 1, and a liquid outlet pipe 4 for controlling the outflow of liquid is connected through the lower end of the tower body 1. A reboiler 5 is installed on the liquid outlet pipe 4, and an air inlet pipe 6 for controlling gas flow is connected through between the reboiler 5 and the tower body 1; An air outlet pipe 7 is connected through the upper end of the tower body 1, a condenser 8 is installed on the air outlet pipe 7, a drain pipe 9 is connected through below the condenser 8, and a reflux pipe 10 for conveying condensed water is connected between the drain pipe 9 and the tower body 1; Two sets of upper and lower circulation filtration groups 11 are arranged in the tower body 1 with respect to the liquid inlet pipe 3.

[0038] The circulating filtration group 11 includes a plurality of trays 111 fixedly arranged in the tower body 1 at equal intervals. On one side of the tray 111 that does not contact the tower body 1, a vertical plate 112 is fixedly connected. The vertical plate 112 is fixedly connected to the two adjacent upper and lower trays 111, and a flow groove 113 is formed on the lower end surface of the vertical plate 112. One side of the tray 111 is in arc shape and fixedly contacts the inner side of the tower body 1, and the other side of the tray 111 is in straight line shape and does not contact the inner side wall of the tower body 1, and the two adjacent upper and lower trays 111 are arranged in a staggered manner.

[0039] The circulating filtration group 11 further includes a plurality of air holes 114 formed in the trays 111 at equal intervals. An inner sleeve 115 communicating with the air holes 114 is installed on the upper surface of the tray 111. An outer sleeve 116 is connected to the outside of the inner sleeve 115 in a lifting manner. The air holes 114 on the trays 111 distributed longitudinally in a staggered manner are vertically corresponding. The inner diameter of the outer sleeve 116 is larger than the outer diameter of the inner sleeve 115.

[0040] A sliding sleeve 12 is fixedly installed on the upper end surface of the inner sleeve 115. A sliding rod 13 is slidably connected in the sliding sleeve 12, and the sliding rod 13 is fixedly connected to the outer sleeve 116.

[0041] A current-limiting disc 14 is rotatably installed in the inner sleeve 115. A driven rotating rod 15 is connected to the current-limiting disc 14 along the axis direction of the rotating shaft. The driven rotating rod 15 is rotatably installed on the outer wall of the inner sleeve 115. A driving rotating rod 16 is fixedly connected to the inner side wall of the outer sleeve 116. A transmission rod 17 is rotatably connected to the driving rotating rod 16, and the other end of the transmission rod 17 is rotatably connected to the driven rotating rod 15.

[0042] A fixing bracket 18 is fixedly installed on the outside of the plurality of outer sleeves 116. A lifting frame 19 is fixedly installed on one side of the fixing bracket 18. The lifting frame 19 vertically penetrates and is slidably connected to the tray 111.

[0043] The liquid is controlled to flow into the tower body 1 through the liquid inlet pipe 3. The liquid enters the circulating filtration group 11 below the interior of the tower body 1. The liquid is successively retained on the trays 111 in the lower circulating filtration group 11 and finally accumulates at the bottom of the tower body 1. Part of the liquid flows into the reboiler 5 through the liquid outlet pipe 4 at the bottom of the tower body 1. Through the heating effect of the reboiler 5, the liquid is vaporized into high-pressure gas. The gas enters the tower body 1 through the gas inlet pipe 6. Part of the high-pressure gas floats upward and successively passes through the trays 111 in the tower body 1. Part of the high-pressure gas presses down the liquid at the bottom of the tower body 1 into the reboiler 5 to keep the gas continuously heated and enter the interior of the tower body 1. The gas in the tower body 1 passes through the trays 111 layer by layer for purification. Finally, it enters the interior of the condenser 8 through the gas outlet pipe 7 above the tower body 1. The gas is cooled through the condensation of the condenser 8. Part of the gas turns into liquid after cooling. The liquid is discharged outward through the drain pipe 9 and the reflux pipe 10. The liquid inside the reflux pipe 10 re-enters the interior of the tower body 1. The liquid enters the circulating filtration group 11 above the tower body 1 and accumulates layer by layer on the trays 111 in the upper circulating filtration group 11, enabling the liquid to be recycled and ensuring that the gas can be better purified during the rising process in the tower body 1.

[0044] When the gas passes through the tray 111, it enters the air holes 114 opened on the tray 111. The gas passes through the air holes 114 and enters the inner sleeve 115. A flow-limiting disc 14 is inclinedly arranged in the inner sleeve 115. The flow-limiting disc 14 can limit the flow rate of the gas passing through. The gas flow in the inner sleeve 115 enters the outer sleeve 116. The gas in the outer sleeve 116 is discharged from the lower opening and contacts the liquid accumulated on the tray 111. The liquid is heated and vaporized, and the components of the liquid are purified by utilizing the different boiling points of the components in the liquid.

[0045] According to the change of the air flow pressure inside the tower body 1, the gas flow rate passing through the tray 111 can be automatically adjusted. Under the action of air pressure, the lifting frame 19 moves upward through the tray 111. The lifting frame 19 drives the fixed bracket 18 to move upward, thereby controlling the outer sleeve 116 to move upward sleeved outside the inner sleeve 115 and adjusting the distance between the outer sleeve 116 and the inner sleeve 115, so as to adjust the air flow rate. At the same time, when the outer sleeve 116 moves upward, it drives the driving rod 16 fixed to the inner side wall to move upward. At this time, the two ends of the transmission rod 17 connected between the driving rod 16 and the driven rod 15 rotate correspondingly. The rotating transmission rod 17 can push the driven rod 15 to rotate, thereby driving the flow-limiting disc 14 in the inner sleeve 115 to rotate correspondingly and adjusting the inclination angle of the flow-limiting disc 14 in the inner sleeve 115, further adjusting the gas flow rate in the inner sleeve 115 and the outer sleeve 116.

[0046] Embodiment 2: On the basis of Embodiment 1, a filtering mechanism is further disclosed, and its specific structure is as follows: A filtering mechanism for absorbing and filtering harmful components in the gas is provided on the lower end surface of the tray 111. The filtering mechanism includes a sealing cover 20 fixedly installed on the lower end surface of the tray 111, and the sealing cover 20 covers the lower part of the air hole 114; an upper mesh cover 21 is fixedly installed on the lower surface of the sealing cover 20, and an elastic filler 22 for filtering the gas is fixedly installed on the lower end surface of the upper mesh cover 21.

[0047] A lower mesh cover 23 for assisting in squeezing out water is connected to the lower part of the elastic filler 22 in a lifting manner; a guide seat 24 is fixedly installed on the side of the upper mesh cover 21, a guide rod 25 is slidably connected in the guide seat 24, and the guide rod 25 is fixedly connected to the lower mesh cover 23; a plurality of air bags 27 are intermittently fixed in the mesh holes of the lower mesh cover 23.

[0048] A positioning piece 26 is fixedly sleeved on the outside of the guide rod 25, and the positioning piece 26 supports above the guide seat 24; the guide rod 25 on one side of the lower mesh cover 23 is fixedly connected to the lifting frame 19.

[0049] Before the gas in the tower body 1 enters the tray 111, it is first preliminarily filtered through the filtering mechanism. The gas enters the elastic filler 22. By controlling the density of the elastic filler 22, it is ensured that the gas can pass through smoothly and quickly. After being preliminarily filtered by the elastic filler 22, the gas rises and enters the tray 111, achieving the purpose of filtering the gas inside the tower body 1.

[0050] According to the change of the gas pressure inside the tower body 1, the air pressure acts on the lower mesh cover 23 below the elastic filler 22. A plurality of air bags 27 are embedded and installed in the mesh holes of the lower mesh cover 23. The lower mesh cover 23 can be driven to move upward by the air pressure. The guide rods 25 on both sides of the lower mesh cover 23 penetrate through the guide seat 24 and move upward. The upward movement of the lower mesh cover 23 squeezes the elastic filler 22, which can squeeze the water absorbed by the elastic filler 22, maintaining the purpose of the elastic filler 22 continuously absorbing and filtering the gas. At the same time, the upward movement of the guide rod 25 can drive the lifting frame 19 to move upward synchronously, providing power for the lifting frame 19, so as to adjust the gas passing amount in the tray 111 according to the air pressure.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A highly efficient circulating rectifying column for liquid purification, comprising a column body (1) for purifying liquid and a support frame (2) fixedly installed outside the column body (1), characterized in that: A liquid inlet pipe (3) for controlling the entry of liquid is connected to the side of the tower body (1) in a penetrating manner. An outlet pipe (4) for controlling the outflow of liquid is connected to the lower end of the tower body (1) in a penetrating manner. A reboiler (5) is installed on the outlet pipe (4). An intake pipe (6) for controlling the flow of gas is connected between the reboiler (5) and the tower body (1) in a penetrating manner; An outlet pipe (7) is connected to the upper end of the tower body (1) in a penetrating manner. A condenser (8) is installed on the outlet pipe (7). A drain pipe (9) is connected to the lower part of the condenser (8) in a penetrating manner. A reflux pipe (10) for transporting condensed water is connected between the drain pipe (9) and the tower body (1); Two sets of upper and lower circulating filtration groups (11) are arranged in the tower body (1) with respect to the liquid inlet pipe (3).

2. The high-efficiency circulating rectifying column for liquid purification according to claim 1, wherein: The circulating filtration group (11) includes a plurality of tower plates (111) fixed in the tower body (1) at equal intervals. A vertical plate (112) is fixedly connected to one side of the tower plate (111) that does not contact the tower body (1). The vertical plate (112) is fixedly connected to the two adjacent upper and lower tower plates (111), and a flow groove (113) is formed on the lower end surface of the vertical plate (112); One side of the tower plate (111) is in an arc shape and is fixedly in contact with the inner side of the tower body (1). The other side of the tower plate (111) is in a straight line shape and does not contact the inner side wall of the tower body (1), and the two adjacent upper and lower tower plates (111) are arranged in a staggered manner.

3. The high-efficiency circulating rectifying column for liquid purification according to claim 2, characterized in that: The circulating filtration group (11) further includes a plurality of air holes (114) opened on the tower plate (111) at equal intervals. An inner sleeve (115) communicating with the air holes (114) is installed on the upper surface of the tower plate (111). An outer sleeve (116) is connected to the outside of the inner sleeve (115) in a lifting manner; The air holes (114) on the longitudinally staggered tower plates (111) correspond to each other up and down; The inner diameter of the outer sleeve (116) is larger than the outer diameter of the inner sleeve (115).

4. The high-efficiency circulating rectifying column for liquid purification according to claim 3, wherein: A sliding sleeve (12) is fixedly installed on the upper end surface of the inner sleeve (115). A sliding rod (13) is slidably connected in the sliding sleeve (12), and the sliding rod (13) is fixedly connected to the outer sleeve (116).

5. A high-efficiency circulating rectifying column for liquid purification according to claim 4, characterized in that: A flow-limiting disc (14) is rotatably installed in the inner sleeve (115). A driven rotating rod (15) is connected along the axis of the rotating shaft of the flow-limiting disc (14), and the driven rotating rod (15) is rotatably installed on the outer wall of the inner sleeve (115); A driving rotating rod (16) is fixedly connected to the inner side wall of the outer sleeve (116). A transmission rod (17) is rotatably connected to the driving rotating rod (16), and the other end of the transmission rod (17) is rotatably connected to the driven rotating rod (15).

6. The high-efficiency circulating rectifying column for liquid purification according to claim 4, wherein: A fixing bracket (18) is fixedly installed on the outside of the plurality of outer sleeves (116). A lifting frame (19) is fixedly installed on one side of the fixing bracket (18), and the lifting frame (19) is longitudinally penetrated and slidably connected to the tower plate (111).

7. The high-efficiency circulating rectifying column for liquid purification according to claim 2, wherein: A filtering mechanism for absorbing and filtering harmful components in the gas is arranged on the lower end surface of the tower plate (111).

8. The high-efficiency circulating rectifying column for liquid purification according to claim 7, wherein: The filtering mechanism includes a sealing cover (20) fixedly installed on the lower end surface of the tower plate (111), and the sealing cover (20) covers the lower part of the air hole (114); The upper net cover (21) is fixedly installed on the lower surface of the sealing cover (20), and an elastic filler (22) for filtering gas is fixedly installed on the lower end surface of the upper net cover (21).

9. The high-efficiency circulating rectifying column for liquid purification according to claim 8, wherein: A lower net cover (23) for assisting in squeezing out water is connected to the lower part of the elastic filler (22) in a lifting manner; A guide seat (24) is fixedly installed on the side of the upper net cover (21), a guide rod (25) is slidably connected in the guide seat (24), and the guide rod (25) is fixedly connected to the lower net cover (23); A plurality of air bags (27) are intermittently fixed in the mesh holes of the lower net cover (23).

10. A highly efficient circulating rectifying column for liquid purification according to claim 9, characterized in that: A positioning piece (26) is fixedly sleeved outside the guide rod (25), and the positioning piece (26) is supported above the guide seat (24); The guide rod (25) on one side of the lower net cover (23) is fixedly connected to the lifting frame (19).

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