An apparatus for recovering tail gas in the production of VCM and a recovery method thereof

Abstract

The present invention discloses an exhaust gas recovery device for preparing VCM and a recovery method thereof, including two circular frames. A cylinder is jointly arranged between the two circular frames. Activated carbon is arranged in the inner cavity of the cylinder. Connecting rods are fixedly connected to both the top and bottom of the circular frames. The ends of the connecting rods far away from the circular frames are fixedly connected with connecting disks. Moving rings are sleeved on the outer edges of the connecting rods. Cross bars are fixedly connected to the opposite sides of the moving rings. Through the mutual cooperation among structures such as an annular frame, a moving rod, a sealing disk, an adjusting rod, etc., when the activated carbon inside the cylinder finishes working, the moving rod can be pulled, and the moving rod drives the sealing disk to move. The brine inside the annular frame will move to the inside of the cylinder through the circular frame, and the brine thus cools the activated carbon inside the cylinder for subsequent use.

Description

Technical Field

[0001] The present invention relates to the technical field of VCM tail gas recovery, and particularly to a tail gas recovery device for preparing VCM and a recovery method thereof. Background Technique

[0002] In the process of vinyl chloride (VCM) polymerization, in order to achieve the economy of process operation and ensure the quality of resin, the final conversion rate of VCM is generally controlled at 80% - 85%. During this process, tail gas will be generated from vinyl chloride, and at this time, it is necessary to recover the vinyl chloride tail gas. Currently, the methods for recovering vinyl chloride tail gas are divided into activated carbon adsorption, membrane adsorption, activated carbon fiber adsorption, and pressure swing adsorption.

[0003] However, there are some problems in the existing vinyl chloride tail gas recovery devices during use. The existing recovery devices are not convenient to produce different pre - recovery effects according to different situations of vinyl chloride tail gas during use, which may lead to a reduction in the subsequent recovery and purification effect of vinyl chloride tail gas. At the same time, when the existing recovery devices cool down the activated carbon, the expected cooling effect cannot be achieved, and it is not easy to collect the brine used for cooling. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solutions: A tail gas recovery device for preparing VCM and a recovery method thereof, including two circular frames. A cylinder is jointly arranged between the two circular frames. Activated carbon is arranged in the inner cavity of the cylinder. Connecting rods are fixedly connected to the top and bottom of the circular frames respectively. The ends of the connecting rods far away from the circular frames are fixedly connected with connection plates. Moving rings are sleeved on the outer edges of the connecting rods. Cross bars are fixedly connected to the corresponding sides of the moving rings. Connection plates are fixedly connected to the corresponding ends of the cross bars. Springs are jointly fixedly connected between the two connection plates on the same side. Adjusting mechanisms are arranged on the sides of the circular frames far away from the cylinder. Pretreatment mechanisms are arranged on the sides of the circular frames far away from the cylinder. A moving mechanism is arranged at the rear of the cylinder.

[0005] Preferably, the adjusting mechanism includes two annular frames. Through holes are opened on the front and rear sides of the inner cavity of the annular frames. The through holes and the inner cavity of the annular frames are not set to be mutually communicated. Adjusting rods are respectively arranged through the inner cavities of the through holes. The ends of the adjusting rods far away from the cylinder are fixedly connected with fixed plates;

[0006] Fixed tubes are respectively arranged through the top and bottom of the annular frames and are fixedly connected thereto. Limiting tubes are respectively arranged through the top and bottom of the inner cavity of the annular frames and are fixedly connected thereto. Moving rods are respectively arranged through the inner cavities of the fixed tubes. Sealing plates are fixedly connected to the corresponding ends of the moving rods. Moving plates are fixedly connected to the ends of the moving rods far away from the sealing plates.

[0007] Preferably, the moving mechanism includes an electric telescopic rod. The bottom end of the electric telescopic rod is fixedly connected with a load-bearing plate, and the top end of the electric telescopic rod is fixedly connected with a fixing ring. A motor is fixedly connected to the inner cavity of the fixing ring, and a transmission rod is fixedly connected to the power output shaft of the motor. A regulating plate is fixedly connected to the front end of the transmission rod;

[0008] Limit plates are fixedly connected to the rear sides of the circular frames. Rotating plates are inserted into the opposite sides of the limit plates. Threaded rods are fixedly connected to the opposite sides of the rotating plates. Threaded holes are fixedly connected to the left and right sides of the regulating plate. The threaded rods are located in the inner cavities of the adjacent threaded holes and are meshed with them.

[0009] Preferably, the adjusting mechanism includes two connecting pipes. Magnets are fixedly connected to the ends of the connecting pipes close to the circular frames. The connecting pipes are arranged in mutual contact with the adjacent circular frames. Four fixing plates are fixedly connected to the outer edges of the connecting pipes. Connecting holes are opened in the inner cavities of the fixing plates. An annular plate is arranged near the left side in the inner cavity of the left connecting pipe. A filter screen is fixedly connected to the inner cavity of the annular plate. A plurality of ropes are fixedly connected to the right side of the filter screen. Swing plates are arranged near the left side of the front and rear sides in the inner cavity of the left connecting pipe. Hinges are arranged on one side of each swing plate. The swing plates are movably connected to the inner cavity of the connecting pipe through the hinges;

[0010] Support rods are fixedly connected to the front and rear sides near the right side in the inner cavity of the right connecting pipe. Movable pipes are sleeved on the outer edges of the support rods. Adjusting discs are fixedly connected to the corresponding ends of the support rods. Arc-shaped rods are fixedly connected to the tops and bottoms of the two movable pipes together. A semi-circular plate is fixedly connected to the right side of the upper arc-shaped rod.

[0011] Preferably, a plurality of fixing cylinders are arranged between the arc-shaped rods. Vertical rods are fixedly connected to the top and bottom ends of the fixing cylinders. One end of each vertical rod is fixedly connected to one side of the adjacent arc-shaped rod. Four baffle plates are fixedly connected to the left and right sides of each fixing cylinder.

[0012] Preferably, a limit ring is fixedly connected to the outer edge of the electric telescopic rod near the bottom end. A fixing rod is fixedly connected to the front side of the limit ring. A collection box is fixedly connected to the front end of the fixing rod.

[0013] Preferably, support columns are fixedly connected to the front and rear sides near the bottom of the circular frames. Support plates are fixedly connected to the bottom ends of the support columns.

[0014] Preferably, arc-shaped plates are sleeved on the top and bottom of the cylinder. Elastic rods are fixedly connected to the corresponding sides of the arc-shaped plates together.

[0015] A tail gas recovery device for preparing VCM and its recovery method include the following steps:

[0016] S1: When the device starts to work, the operator puts the arc plate and the elastic rod on the outer edge of the cylinder, places the cylinder inside two circular frames, and then conveys the tail gas of VCM into the cylinder.

[0017] S2: When there are particles in the VCM tail gas, convey the VCM tail gas into the left connecting pipe. The filter screen inside the left connecting pipe will filter the particles in the VCM tail gas. At the same time, the VCM tail gas will drive the annular plate to move through the filter screen, the swing plate will limit the annular plate, and the VCM tail gas will blow the rope through the filter screen.

[0018] S3: The VCM tail gas will be conveyed from inside the left circular frame into the cylinder. The activated carbon inside the cylinder will filter the VCM tail gas and convey it into the right connecting pipe through the right circular frame, and then it can enter the next cylinder for recycling and purification again.

[0019] S4: When the temperature of the VCM tail gas is relatively high, convey the VCM tail gas from inside the right connecting pipe. The VCM tail gas will contact the fixed cylinder and the semi-circular plate. The VCM tail gas drives the arc rod to rotate through the semi-circular plate. The arc rod drives the movable pipe to rotate. The arc rod drives the fixed cylinder to rotate through the vertical rod. The coolant inside the fixed cylinder will reciprocate up and down to cool the VCM tail gas contacting the fixed cylinder, and convey it into the cylinder through the right circular frame. The subsequent operation process is the same as the above process.

[0020] S5: After the recycling and purification of the VCM tail gas is completed, remove the connecting pipe from the surface of the circular frame. Since the material of the circular frame is iron and one end of the connecting pipe is fixedly connected with a magnet, the magnet will move away from the circular frame.

[0021] S6: Then start the electric telescopic rod through an external power supply. The electric telescopic rod drives the fixed ring to move. The fixed ring drives the motor to move. The motor drives the adjusting plate to move through the transmission rod. The adjusting plate drives the rotating plate to move through the threaded rod. The rotating plate drives the circular frame to move through the limiting plate. The circular frame drives the cylinder to move. When the cylinder moves to an appropriate height, stop the electric telescopic rod from working and start the motor through an external power supply. The motor drives the transmission rod to rotate. The transmission rod drives the adjusting plate to rotate. The adjusting plate rotates through the threaded rod and the rotating plate. The rotating plate drives the circular frame to rotate through the limiting plate. The circular frame drives the cylinder to rotate. At this time, the cylinder is in a vertical state.

[0022] S7: After that, the operator pulls the moving disk, the moving disk drives the moving rod to move, the moving rod drives the sealing disk to move, the sealing disk will move away from the inside of the limiting tube and move into the inside of the annular frame. The brine inside the annular frame will be discharged from the inside of the limiting tube, and the brine will enter the inside of the cylinder. The brine can cool the activated carbon inside the cylinder, which is convenient for the subsequent recovery and purification of VCM tail gas. The excess brine will enter the collection frame.

[0023] S8: When the cylinder needs to be disassembled, adjust the rotating plate. The rotating plate drives the threaded rod to rotate. The threaded rod will gradually move away from the threaded hole inside the adjusting plate. Then move the round frame left and right. The round frame drives the limiting plate to move. The round frame drives the connecting rod to move. The connecting rod drives the connecting disk to move. The connecting rod drives the cross bar to move through the movable ring. The cross bar drives the connecting plate to move. The connecting plate will drive the spring to stretch, thus exposing the cylinder. The operator can disassemble the cylinder together with the activated carbon inside.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. Through the mutual cooperation between structures such as the annular frame, moving rod, sealing disk, and adjusting rod, when the activated carbon inside the cylinder has completed its work, the moving rod can be pulled. The moving rod drives the sealing disk to move. The brine inside the annular frame will move to the inside of the cylinder through the round frame, and the brine can cool and cool the activated carbon inside the cylinder, so as to facilitate subsequent use.

[0026] 2. Through the mutual cooperation between structures such as the electric telescopic rod, motor, collection frame, and threaded rod, before the activated carbon inside the cylinder needs to be cooled, the electric telescopic rod drives the motor to move. The motor drives the transmission rod to rotate. The transmission rod drives the limiting plate to rotate through the adjusting plate. The limiting plate drives the cylinder to rotate through the round frame, making the cylinder in a vertical state, which can better realize subsequent operations.

[0027] 3. Through the mutual cooperation between structures such as the connecting pipe, fixed cylinder, filter screen, and rope, when two different situations occur in the vinyl chloride tail gas, it can work respectively through the different states of the connecting pipes on the left and right sides. The filter screen can filter the particles in the vinyl chloride tail gas. The fixed cylinder reduces the temperature of the vinyl chloride tail gas through the coolant inside, thereby improving the recovery and purification efficiency of the device for vinyl chloride tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional view of the present invention;

[0029] Figure 2 is a schematic structural diagram of the component round frame of the present invention;

[0030] Figure 3 Schematic diagram of the electric telescopic rod structure of the component of the present invention;

[0031] Figure 4 Schematic diagram of the rope structure of the component of the present invention;

[0032] Figure 5 Schematic diagram of the fixed cylinder structure of the component of the present invention;

[0033] Figure 6 Schematic diagram of the moving rod structure of the component of the present invention.

[0034] Reference numerals in the figure: 1, circular frame; 2, annular frame; 3, fixing plate; 4, connecting pipe; 5, annular plate; 6, swing plate; 7, rope; 8, filter screen; 9, fixed disk; 10, support column; 11, support plate; 12, arc plate; 13, connecting disk; 14, cross bar; 15, limiting plate; 16, adjusting plate; 17, motor; 18, transmission rod; 19, fixing ring; 20, collection box; 21, connecting plate; 22, fixing pipe; 23, moving disk; 24, connecting rod; 25, movable ring; 26, spring; 27, cylinder; 28, rotating plate; 29, threaded rod; 30, limiting ring; 31, load-bearing plate; 32, fixing rod; 33, adjusting rod; 34, semi-circular plate; 35, arc rod; 36, movable pipe; 37, support rod; 38, adjusting disk; 39, vertical rod; 40, fixed cylinder; 41, baffle; 42, moving rod; 43, sealing disk; 44, limiting pipe; 45, electric telescopic rod. Detailed implementation manners

[0035] 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.

[0036] The present invention provides a technical solution:

[0037] Please refer to Figure 1-2 、 Figure 6, An exhaust gas recovery device for preparing VCM and its recovery method, including two circular frames 1. A cylinder 27 is jointly arranged between the two circular frames 1. Activated carbon is arranged in the inner cavity of the cylinder 27. Connecting rods 24 are fixedly connected to the top and bottom of the circular frame 1 respectively. The ends of the connecting rods 24 far from the circular frame 1 are fixedly connected with connecting plates 13. Moving rings 25 are sleeved on the outer edges of the connecting rods 24. Cross bars 14 are fixedly connected to the corresponding sides of the moving rings 25. Connecting plates 21 are fixedly connected to the corresponding ends of the cross bars 14. Springs 26 are jointly fixedly connected between the two connecting plates 21 on the same side. Adjusting mechanisms are arranged on the sides of the circular frames 1 far from the cylinder 27. Pretreatment mechanisms are arranged on the sides of the circular frames 1 far from the cylinder 27. A moving mechanism is arranged at the rear of the cylinder 27;

[0038] Support columns 10 are fixedly connected to the front and rear sides near the bottom of the circular frame 1. The bottom ends of the support columns 10 are fixedly connected with support plates 11. Arc-shaped plates 12 are sleeved on the top and bottom of the cylinder 27. Elastic rods are jointly fixedly connected to the corresponding sides of the arc-shaped plates 12;

[0039] The adjusting mechanism includes two annular frames 2. Through holes are opened on the front and rear sides of the inner cavity of the annular frame 2. The through holes and the inner cavity of the annular frame 2 are not set to be mutually communicated. Adjusting rods 33 penetrate through the inner cavities of the through holes. Fixed plates 9 are fixedly connected to the ends of the adjusting rods 33 far from the cylinder 27;

[0040] Fixed tubes 22 penetrate through the top and bottom of the annular frame 2 and are fixedly connected thereto. Limiting tubes 44 penetrate through the top and bottom of the inner cavity of the annular frame 2 and are fixedly connected thereto. Moving rods 42 penetrate through the inner cavities of the fixed tubes 22. Sealing plates 43 are fixedly connected to the corresponding ends of the moving rods 42. Moving plates 23 are fixedly connected to the ends of the moving rods 42 far from the sealing plates 43;

[0041] When the activated carbon inside the cylinder 27 has completed its work, pull the moving rod 42. The moving rod 42 drives the sealing plate 43 to move. The brine inside the annular frame 2 will move to the inside of the cylinder 27 through the circular frame 1. The brine will thus cool down the activated carbon inside the cylinder 27 for subsequent use.

[0042] Further, please refer to Figure 1 、 Figure 3 The moving mechanism includes an electric telescopic rod 45. A load-bearing plate 31 is fixedly connected to the bottom end of the electric telescopic rod 45. A fixed ring 19 is fixedly connected to the top end of the electric telescopic rod 45. A motor 17 is fixedly connected to the inner cavity of the fixed ring 19. A transmission rod 18 is fixedly connected to the power output shaft of the motor 17. An adjusting plate 16 is fixedly connected to the front end of the transmission rod 18;

[0043] On the rear sides of the circular frames 1, limiting plates 15 are fixedly connected. On the corresponding sides of the limiting plates 15, rotating plates 28 are inserted. On the corresponding sides of the rotating plates 28, threaded rods 29 are fixedly connected. On the left and right sides of the adjusting plate 16, threaded holes are fixedly connected. The threaded rods 29 are located in the inner cavities of the adjacent threaded holes and are meshed with them;

[0044] Near the bottom end of the outer edge of the electric telescopic rod 45, a limiting ring 30 is fixedly connected. On the front side of the limiting ring 30, a fixed rod 32 is fixedly connected. At the front end of the fixed rod 32, a collection box 20 is fixedly connected;

[0045] Before the activated carbon inside the cylinder 27 needs to be cooled down, the electric telescopic rod 45 drives the motor 17 to move. The motor 17 drives the transmission rod 18 to rotate. The transmission rod 18 drives the limiting plate 15 to rotate through the adjusting plate 16. The limiting plate 15 drives the cylinder 27 to rotate through the circular frame 1, making the cylinder 27 in a vertical state, which can better realize the subsequent operations.

[0046] Further, please refer to Figure 1 、 Figure 4-5 The adjusting mechanism includes two connecting pipes 4. At the ends of the connecting pipes 4 close to the circular frames 1, magnets are fixedly connected. The connecting pipes 4 are arranged in mutual contact with the adjacent circular frames 1. On the outer edges of the connecting pipes 4, four fixing plates 3 are fixedly connected. Connecting holes are opened in the inner cavities of the fixing plates 3. Near the left side in the inner cavity of the left connecting pipe 4, an annular plate 5 is arranged. A filter net 8 is fixedly connected in the inner cavity of the annular plate 5. A number of ropes 7 are fixedly connected to the right side of the filter net 8. Near the left side on the front and rear sides in the inner cavity of the left connecting pipe 4, swing plates 6 are arranged. On one side of each swing plate 6, a hinge is arranged. The swing plates 6 are movably connected to the inner cavity of the connecting pipe 4 through the hinges;

[0047] On the front and rear sides near the right side in the inner cavity of the right connecting pipe 4, support rods 37 are fixedly connected. On the outer edges of the support rods 37, movable pipes 36 are sleeved. At the corresponding ends of the support rods 37, adjusting discs 38 are fixedly connected. At the top and bottom of the two movable pipes 36, arc-shaped rods 35 are fixedly connected together. On the right side of the upper arc-shaped rod 35, a semi-circular plate 34 is fixedly connected;

[0048] Between the arc-shaped rods 35, a number of fixed cylinders 40 are arranged together. At the top and bottom ends of the fixed cylinders 40, vertical rods 39 are fixedly connected. One end of the vertical rod 39 is fixedly connected to one side of the adjacent arc-shaped rod 35. On the left and right sides of the fixed cylinders 40, four baffle plates 41 are fixedly connected;

[0049] When two different situations occur in the vinyl chloride tail gas, the device can work through different states of the left and right connecting pipes 4 respectively. The filter screen 8 can filter the particles in the vinyl chloride tail gas, and the fixed cylinder 40 can reduce the temperature of the vinyl chloride tail gas through the internal coolant, thereby improving the recovery and purification efficiency of the device for the vinyl chloride tail gas.

[0050] A tail gas recovery device for preparing VCM and its recovery method, including the following steps:

[0051] S1: When the device starts to work, the operator sleeves the arc plate 12 and the elastic rod on the outer edge of the cylinder 27, places the cylinder 27 inside the two circular frames 1, and then conveys the tail gas of VCM into the cylinder 27.

[0052] S2: When there are particles in the VCM tail gas, convey the VCM tail gas into the left connecting pipe 4. The filter screen 8 inside the left connecting pipe 4 will filter the particles in the VCM tail gas. At the same time, the VCM tail gas will drive the annular plate 5 to move through the filter screen 8, the swing plate 6 will limit the annular plate 5, and the VCM tail gas will blow the rope 7 through the filter screen 8.

[0053] S3: The VCM tail gas will be conveyed from inside the left circular frame 1 into the cylinder 27. The activated carbon inside the cylinder 27 will filter the VCM tail gas, and then be conveyed through the right circular frame 1 into the right connecting pipe 4, and then can enter the next cylinder 27 for further recovery and purification.

[0054] S4: When the temperature of the VCM tail gas is relatively high, convey the VCM tail gas from inside the right connecting pipe 4. The VCM tail gas will contact the fixed cylinder 40 and the semi-circular plate 34. The VCM tail gas will drive the arc rod 35 to rotate through the semi-circular plate 34. The arc rod 35 will drive the movable pipe 36 to rotate. The arc rod 35 will drive the fixed cylinder 40 to rotate through the vertical rod 39. The coolant inside the fixed cylinder 40 will reciprocate up and down, thereby cooling the VCM tail gas in contact with the fixed cylinder 40, and then be conveyed through the right circular frame 1 into the cylinder 27. The subsequent operation process is the same as the above process.

[0055] S5: After the recovery and purification of the VCM tail gas is completed, remove the connecting pipe 4 from the surface of the circular frame 1. Since the material of the circular frame 1 is iron and one end of the connecting pipe 4 is fixedly connected with a magnet, the magnet will move away from the circular frame 1.

[0056] S6: Then, start the electric telescopic rod 45 through an external power supply. The electric telescopic rod 45 drives the fixed ring 19 to move. The fixed ring 19 drives the motor 17 to move. The motor 17 drives the adjusting plate 16 to move through the transmission rod 18. The adjusting plate 16 drives the rotating plate 28 to move through the threaded rod 29. The rotating plate 28 drives the circular frame 1 to move through the limiting plate 15. The circular frame 1 drives the cylinder 27 to move. When the cylinder 27 moves to an appropriate height, stop the electric telescopic rod 45 from working and start the motor 17 through an external power supply. The motor 17 drives the transmission rod 18 to rotate. The transmission rod 18 drives the adjusting plate 16 to rotate. The adjusting plate 16 rotates through the threaded rod 29 and the rotating plate 28. The rotating plate 28 drives the circular frame 1 to rotate through the limiting plate 15. The circular frame 1 drives the cylinder 27 to rotate. At this time, the cylinder 27 is in a vertical state;

[0057] S7: Then, the operator pulls the moving disk 23. The moving disk 23 drives the moving rod 42 to move. The moving rod 42 drives the sealing disk 43 to move. The sealing disk 43 will move away from the inside of the limiting tube 44 and move into the inside of the annular frame 2. The brine inside the annular frame 2 will be discharged from the inside of the limiting tube 44. The brine will enter the inside of the cylinder 27. The brine can cool the activated carbon inside the cylinder 27, which is convenient for subsequent recovery and purification of VCM tail gas. The excess brine will enter the collection frame 20;

[0058] S8: When the cylinder 27 needs to be disassembled, adjust the rotating plate 28. The rotating plate 28 drives the threaded rod 29 to rotate. The threaded rod 29 will gradually move away from the threaded hole inside the adjusting plate 16. Then, move the circular frame 1 left and right. The circular frame 1 drives the limiting plate 15 to move. The circular frame 1 drives the connecting rod 24 to move. The connecting rod 24 drives the connecting disk 13 to move. The connecting rod 24 drives the cross bar 14 to move through the movable ring 25. The cross bar 14 drives the connecting plate 21 to move. The connecting plate 21 will drive the spring 26 to stretch, so as to expose the cylinder 27. The operator can disassemble the cylinder 27 together with the activated carbon inside.

[0059] Working principle: When the device starts to work, the operator sleevs the arc-shaped plate 12 and the elastic rod on the outer edge of the cylinder 27, and places the cylinder 27 inside the two circular frames 1. At this time, the tail gas of VCM is transported into the cylinder 27. When there are particles in the VCM tail gas, the VCM tail gas is transported into the left connecting pipe 4. The filter screen 8 inside the left connecting pipe 4 will filter the particles in the VCM tail gas. At the same time, the VCM tail gas will drive the annular plate 5 to move through the filter screen 8. The swing plate 6 will limit the annular plate 5. The VCM tail gas will blow the rope 7 through the filter screen 8. The VCM tail gas will be transported from inside the left circular frame 1 into the cylinder 27. The activated carbon inside the cylinder 27 will filter the VCM tail gas and transport it into the right connecting pipe 4 through the right circular frame 1, and then it can enter the next cylinder 27 for recycling and purification again;

[0060] When the temperature of the VCM tail gas is relatively high, the VCM tail gas is transported from inside the right connecting pipe 4. The VCM tail gas will contact the fixed cylinder 40 and the semi-circular plate 34. The VCM tail gas drives the arc-shaped rod 35 to rotate through the semi-circular plate 34. The arc-shaped rod 35 drives the movable pipe 36 to rotate. The arc-shaped rod 35 drives the fixed cylinder 40 to rotate through the vertical rod 39. The coolant inside the fixed cylinder 40 will reciprocally move up and down, thereby cooling the VCM tail gas in contact with the fixed cylinder 40 and transporting it into the cylinder 27 through the right circular frame 1. The subsequent operation process is the same as the above process. After the VCM tail gas is recycled and purified, the connecting pipe 4 is removed from the surface of the circular frame 1. Because the material of the circular frame 1 is iron and one end of the connecting pipe 4 is fixedly connected with a magnet, the magnet will move away from the circular frame 1;

[0061] After that, start the electric telescopic rod 45 through an external power supply. The electric telescopic rod 45 drives the fixed ring 19 to move. The fixed ring 19 drives the motor 17 to move. The motor 17 drives the adjusting plate 16 to move through the transmission rod 18. The adjusting plate 16 drives the rotating plate 28 to move through the threaded rod 29. The rotating plate 28 drives the circular frame 1 to move through the limiting plate 15. The circular frame 1 drives the cylinder 27 to move. When the cylinder 27 moves to an appropriate height, stop the electric telescopic rod 45 from working and start the motor 17 through an external power supply. The motor 17 drives the transmission rod 18 to rotate. The transmission rod 18 drives the adjusting plate 16 to rotate. The adjusting plate 16 rotates through the threaded rod 29 and the rotating plate 28. The rotating plate 28 drives the circular frame 1 to rotate through the limiting plate 15. The circular frame 1 drives the cylinder 27 to rotate. At this time, the cylinder 27 is in a vertical state. Then, the operator pulls the moving disk 23. The moving disk 23 drives the moving rod 42 to move. The moving rod 42 drives the sealing disk 43 to move. The sealing disk 43 will move away from the inside of the limiting tube 44 and move into the annular frame 2. The brine inside the annular frame 2 will be discharged from the inside of the limiting tube 44. The brine will enter the inside of the cylinder 27. The brine can cool the activated carbon inside the cylinder 27, which is convenient for the subsequent recovery and purification of VCM tail gas. The excess brine will enter the collection frame 20;

[0062] When it is necessary to disassemble the cylinder 27, adjust the rotating plate 28. The rotating plate 28 drives the threaded rod 29 to rotate. The threaded rod 29 will gradually move away from the threaded hole inside the adjusting plate 16. Then, move the circular frame 1 left and right. The circular frame 1 drives the limiting plate 15 to move. The circular frame 1 drives the connecting rod 24 to move. The connecting rod 24 drives the connecting disk 13 to move. The connecting rod 24 drives the cross bar 14 to move through the movable ring 25. The cross bar 14 drives the connecting plate 21 to move. The connecting plate 21 will drive the spring 26 to stretch, so that the cylinder 27 is exposed. The operator can disassemble the cylinder 27 together with the activated carbon inside.

[0063] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An off-gas recovery device for preparing VCM, comprising two circular frames (1), characterized in that: A cylinder (27) is commonly arranged between the two circular frames (1). Activated carbon is arranged in the inner cavity of the cylinder (27). Connecting rods (24) are fixedly connected to both the top and bottom of the circular frame (1). Connection plates (13) are fixedly connected to the ends of the connecting rods (24) far from the circular frame (1). Movable rings (25) are sleeved on the outer edges of the connecting rods (24). Cross bars (14) are fixedly connected to the corresponding sides of the movable rings (25). Connection plates (21) are fixedly connected to the corresponding ends of the cross bars (14). Springs (26) are commonly fixedly connected between the two connection plates (21) on the same side. Adjusting mechanisms are arranged on the sides of the circular frames (1) far from the cylinder (27). Pretreatment mechanisms are arranged on the sides of the circular frames (1) far from the cylinder (27). A moving mechanism is arranged at the rear of the cylinder (27). The pretreatment mechanism includes two connecting pipes (4). Magnets are fixedly connected to the ends of the connecting pipes (4) close to the circular frames (1). The connecting pipes (4) are arranged in mutual contact with the adjacent circular frames (1). Four fixing plates (3) are fixedly connected to the outer edges of the connecting pipes (4). Connection holes are opened in the inner cavities of the fixing plates (3). An annular plate (5) is arranged near the left side in the inner cavity of the left connecting pipe (4). A filter net (8) is fixedly connected to the inner cavity of the annular plate (5). A plurality of ropes (7) are fixedly connected to the right side of the filter net (8). Swing plates (6) are arranged near the left side on the front and rear sides in the inner cavity of the left connecting pipe (4). Hinges are arranged on one side of each swing plate (6). The swing plates (6) are movably connected to the inner cavity of the connecting pipe (4) through the hinges; Support rods (37) are fixedly connected to the front and rear sides near the right side in the inner cavity of the right connecting pipe (4). Movable pipes (36) are sleeved on the outer edges of the support rods (37). Adjusting discs (38) are fixedly connected to the corresponding ends of the support rods (37). Arc-shaped rods (35) are commonly fixedly connected to the top and bottom of the two movable pipes (36). A semi-circular plate (34) is fixedly connected to the right side of the upper arc-shaped rod (35). A plurality of fixed cylinders (40) are commonly arranged between the arc-shaped rods (35). Vertical rods (39) are fixedly connected to both the top and bottom of the fixed cylinder (40). One end of each vertical rod (39) is fixedly connected to one side of the adjacent arc-shaped rod (35). Four baffle plates (41) are fixedly connected to both the left and right sides of the fixed cylinder (40).

2. The tail gas recovery device for preparing VCM according to claim 1, wherein: The adjusting mechanism includes two annular frames (2). Through holes are opened in the front and rear sides of the inner cavity of the annular frame (2). The through holes are not arranged to be mutually communicated with the inner cavity of the annular frame (2). Adjusting rods (33) penetrate through the inner cavities of the through holes. Fixed discs (9) are fixedly connected to the ends of the adjusting rods (33) far from the cylinder (27); The top and bottom of the annular frame (2) are both provided with and fixedly connected to fixed pipes (22) penetrating therethrough. The top and bottom of the inner cavity of the annular frame (2) are both provided with and fixedly connected to limiting pipes (44) penetrating therethrough. The inner cavities of the fixed pipes (22) are both provided with moving rods (42) penetrating therethrough. The corresponding ends of the moving rods (42) are fixedly connected with sealing discs (43). The ends of the moving rods (42) away from the sealing discs (43) are fixedly connected with moving discs (23).

3. The tail gas recovery device for preparing VCM according to claim 1, characterized in that: The moving mechanism includes an electric telescopic rod (45). The bottom end of the electric telescopic rod (45) is fixedly connected with a load-bearing plate (31). The top end of the electric telescopic rod (45) is fixedly connected with a fixed ring (19). The inner cavity of the fixed ring (19) is fixedly connected with a motor (17). The power output shaft of the motor (17) is fixedly connected with a transmission rod (18). The front end of the transmission rod (18) is fixedly connected with an adjusting plate (16). Limiting plates (15) are fixedly connected to the rear sides of the circular frames (1). Rotating plates (28) are inserted into the corresponding sides of the limiting plates (15). Threaded rods (29) are fixedly connected to the corresponding sides of the rotating plates (28). Threaded holes are fixedly connected to the left and right sides of the adjusting plate (16). The threaded rods (29) are located in the inner cavities of the adjacent threaded holes and are meshed with each other.

4. The tail gas recovery device for preparing VCM according to claim 3, characterized in that: A limiting ring (30) is fixedly connected to the outer edge of the electric telescopic rod (45) near the bottom end. A fixed rod (32) is fixedly connected to the front side of the limiting ring (30). A collection box (20) is fixedly connected to the front end of the fixed rod (32).

5. The tail gas recovery device for preparing VCM according to claim 1, wherein: Support columns (10) are fixedly connected to the bottom of the circular frame (1) near the front and rear sides. The bottom ends of the support columns (10) are fixedly connected with support plates (11).

6. The tail gas recovery device for preparing VCM according to claim 1, wherein: Arc-shaped plates (12) are sleeved on the top and bottom of the cylinder (27). Elastic rods are fixedly connected to the corresponding sides of the arc-shaped plates (12).

7. The recovery method of the tail gas recovery device for preparing VCM according to any one of claims 1-6, characterized in that, It includes the following steps: S1: When the device starts to work, the operator sleeves the arc-shaped plate (12) and the elastic rod on the outer edge of the cylinder (27), places the cylinder (27) inside the two circular frames (1), and then conveys the tail gas of VCM into the cylinder (27). S2: When there are particles in the VCM tail gas, the VCM tail gas is conveyed into the left connecting pipe (4). The filter screen (8) inside the left connecting pipe (4) will filter the particles in the VCM tail gas. At the same time, the VCM tail gas will drive the annular plate (5) to move through the filter screen (8). The swing plate (6) will limit the annular plate (5). The VCM tail gas will blow the rope (7) through the filter screen (8). The VCM tail gas is conveyed from inside the left circular frame (1) into the cylinder (27). The activated carbon inside the cylinder (27) will filter the VCM tail gas and convey it into the right connecting pipe (4) through the right circular frame (1), and then it can enter the next cylinder (27) for recycling and purification again. S4: When the temperature of the VCM tail gas is relatively high, the VCM tail gas is transported inside the right connecting pipe (4). The VCM tail gas will come into contact with the fixed cylinder (40) and the semi-circular plate (34). The VCM tail gas drives the arc-shaped rod (35) to rotate through the semi-circular plate (34). The arc-shaped rod (35) drives the movable pipe (36) to rotate. The arc-shaped rod (35) drives the fixed cylinder (40) to rotate through the vertical rod (39). The coolant inside the fixed cylinder (40) will reciprocate up and down, thereby cooling the VCM tail gas in contact with the fixed cylinder (40), and being transported to the inside of the cylinder (27) through the right circular frame (1). The subsequent operation process is the same as the above process; S5: After the VCM tail gas is recovered and purified, the connecting pipe (4) is removed from the surface of the circular frame (1). Since the material of the circular frame (1) is iron and one end of the connecting pipe (4) is fixedly connected with a magnet, the magnet will move away from the circular frame (1); S6: Then, the electric telescopic rod (45) is started through an external power supply. The electric telescopic rod (45) drives the fixed ring (19) to move. The fixed ring (19) drives the motor (17) to move. The motor (17) drives the adjusting plate (16) to move through the transmission rod (18). The adjusting plate (16) drives the rotating plate (28) to move through the threaded rod (29). The rotating plate (28) drives the circular frame (1) to move through the limiting plate (15). The circular frame (1) drives the cylinder (27) to move. When the cylinder (27) moves to an appropriate height, the electric telescopic rod (45) stops working, and the motor (17) is started through an external power supply. The motor (17) drives the transmission rod (18) to rotate. The transmission rod (18) drives the adjusting plate (16) to rotate. The adjusting plate (16) rotates through the threaded rod (29) and the rotating plate (28). The rotating plate (28) drives the circular frame (1) to rotate through the limiting plate (15). The circular frame (1) drives the cylinder (27) to rotate. At this time, the cylinder (27) is in a vertical state; S7: Then, the operator pulls the moving disk (23). The moving disk (23) drives the moving rod (42) to move. The moving rod (42) drives the sealing disk (43) to move. The sealing disk (43) will move away from the inside of the limiting pipe (44) and move into the inside of the annular frame (2). The brine inside the annular frame (2) will be discharged from the inside of the limiting pipe (44). The brine will enter the inside of the cylinder (27). The brine can cool the activated carbon inside the cylinder (27), which is convenient for the subsequent recovery and purification of the VCM tail gas. The excess brine will enter the collection frame (20); S8: When it is necessary to disassemble the cylinder (27), adjust the rotating plate (28). The rotating plate (28) drives the threaded rod (29) to rotate. The threaded rod (29) will gradually move away from the threaded hole inside the adjusting plate (16). Then move the circular frame (1) left and right. The circular frame (1) drives the limiting plate (15) to move. The circular frame (1) drives the connecting rod (24) to move. The connecting rod (24) drives the connecting plate (13) to move. The connecting rod (24) drives the cross bar (14) to move through the movable ring (25). The cross bar (14) drives the connecting plate (21) to move. The connecting plate (21) will drive the spring (26) to stretch, so that the cylinder (27) is exposed. The operator can disassemble the cylinder (27) together with the activated carbon inside.

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