A vinyl chloride recovery device

Abstract

The invention discloses a vinyl chloride recovery device, comprising a condenser and an adsorption device. The adsorption device comprises a shell and a transposition device. An adsorption position and a regeneration position are arranged in the shell. Two adsorption units filled with adsorbent are arranged on the transposition device. When one of the working units is in the adsorption position, the other adsorption unit is in the regeneration position. The position states of the two adsorption units are switched by the transposition device. A regeneration device is arranged on the shell. The regeneration device generates regeneration hot air to heat and regenerate the adsorbent in the adsorption unit. The invention can more thoroughly remove the vinyl chloride component in the gas. After being adsorbed by the adsorption unit, the gas can be directly discharged into the atmosphere without affecting the environment. Moreover, the recovered vinyl chloride monomer can be put back into production, which reduces the waste of raw materials and improves the economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of vinyl chloride gas recovery, and in particular to a vinyl chloride recovery device. Background Art

[0002] Modified acrylic polymer barrier agents are a major mainstream in the current waterproof and oil-proof market. Vinyl chloride is the key monomer for synthesizing such modified acrylic polymers, and plays an important role in improving the rigidity and adhesion of polymers. However, during the polymerization reaction, a certain amount of vinyl chloride monomer is often not fully reacted and is mixed in the waste gas and discharged, so that the discharged waste gas contains a certain amount of vinyl chloride gas. Since vinyl chloride gas is toxic, the vinyl chloride in the waste gas needs to be recovered and treated before it can be discharged.

[0003] Among them, condensation recovery of vinyl chloride is a commonly used recovery technology. Condensation recovery is to reduce the temperature of the exhaust gas to below the boiling point of vinyl chloride (the boiling point of vinyl chloride is -13.9°C) through a condenser or a condensation tower to liquefy the vinyl chloride gas, thereby separating vinyl chloride from other components in the exhaust gas. The separated liquid vinyl chloride is then further purified to recover relatively pure vinyl chloride monomer, which can be re-invested in the production of polyvinyl chloride.

[0004] However, the existing condensation recovery technology has the following problems: the recovery rate is not high, and the vinyl chloride gas in the waste gas cannot be completely removed by condensation recovery. After condensation, a certain amount of vinyl chloride gas will still be mixed in the waste gas, which will cause the waste gas to be directly discharged into the atmosphere and still have a greater impact on the environment; and the incomplete recovery of vinyl chloride monomer will lead to waste of raw materials, affecting the economic benefits of actual production. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and provide a vinyl chloride recovery device.

[0006] The objective of the present invention is achieved through the following technical scheme: a vinyl chloride recovery device, comprising a condenser, an adsorption device, the adsorption device comprising a shell, a transposition device, an adsorption position and a regeneration position are arranged in the shell, two adsorption units filled with adsorbent are arranged on the transposition device, when one of the working units is in the adsorption position, the other adsorption unit is in the regeneration position, and the position states of the two adsorption units are switched by the transposition device; a regeneration device is arranged on the shell; the regeneration device generates regeneration hot air to heat and regenerate the adsorbent in the adsorption unit; the condensation temperature of the condenser is lower than the boiling point of the vinyl chloride gas;

[0007] When treating the gas, the gas to be treated passes through the condenser and the adsorption unit located at the adsorption position in turn; when regenerating the adsorbent in the adsorption unit, the regeneration hot air generated by the regeneration device passes through the adsorption unit located at the regeneration position to form a regeneration tail gas, and the regeneration tail gas passes through the condenser and the adsorption unit located at the adsorption position in turn.

[0008] Preferably, the condenser inlet on the condenser is connected to the air intake main pipe, and the outer shell is provided with an adsorption position inlet, an adsorption position outlet, a regeneration position inlet and a regeneration position outlet, the adsorption position inlet and the adsorption position outlet are respectively located on both sides of the adsorption position, and the regeneration position inlet and the regeneration position outlet are respectively located on both sides of the regeneration position; the condenser outlet on the condenser is connected to the adsorption position inlet through an adsorption air intake pipe, the adsorption position outlet is connected to an adsorption exhaust pipe, the regeneration position inlet is connected to the regeneration device, and the regeneration position outlet is connected to the condenser inlet on the condenser by a pipe.

[0009] Preferably, the regeneration device comprises a regeneration gas inlet duct and a regeneration fan, one end of the regeneration gas inlet duct is connected to the regeneration position inlet, the other end of the regeneration gas inlet duct is connected to the outlet of the regeneration fan, and a heating component is provided on the regeneration gas inlet duct.

[0010] Preferably, a heat exchanger is also included, wherein the first medium inlet on the heat exchanger is connected to the regeneration position outlet via a first heat exchange inlet pipe, and the first medium outlet on the heat exchanger is connected to the condenser inlet on the condenser via a first heat exchange outlet pipe; the second medium inlet on the heat exchanger is connected to a second heat exchange inlet pipe, and the end of the second heat exchange inlet pipe away from the heat exchanger is connected to the adsorption exhaust pipe via a three-way regulating valve; the second medium outlet on the heat exchanger is connected to a second heat exchange outlet pipe.

[0011] Preferably, a dryer is provided on the adsorption air inlet pipeline.

[0012] Preferably, the transposition device comprises a transposition motor and a rotating shaft rotatably arranged in the shell, one end of the rotating shaft is connected to the motor, and the motor is fixedly connected to the shell; the two adsorption units are both fixedly connected to the rotating shaft.

[0013] Preferably, two sensing sheets are provided on the rotating shaft, and an infrared sensor corresponding to the sensing sheets is provided on the inner side of the shell; when one of the adsorption units is located at the adsorption position, the infrared sensor corresponds to one of the sensing sheets on the rotating shaft.

[0014] Preferably, the adsorption unit comprises an adsorbent cylinder, both ends of the adsorbent cylinder are respectively provided with openings, and the adsorbent cylinder is filled with an adsorbent;

[0015] When the adsorbent unit is in the adsorption position, the openings at both ends of the adsorbent cylinder correspond to the adsorption position inlet and the adsorption position outlet on both sides of the adsorption position respectively; when the adsorbent unit is in the regeneration position, the openings at both ends of the adsorbent cylinder correspond to the regeneration position inlet and the regeneration position outlet on both sides of the regeneration position respectively.

[0016] Preferably, the inner sides of the adsorption position inlet and the adsorption position outlet are both provided with a first sealing docking mechanism, and the inner sides of the regeneration position inlet and the regeneration position outlet are both provided with a second sealing docking mechanism; the first sealing docking mechanism comprises a first fixed sleeve, a first sliding sleeve sleeved outside the first fixed sleeve, the first fixed sleeve is fixedly connected to the inner side of the shell, a first sealing ring is provided between the first fixed sleeve and the first sliding sleeve, and a first sealing ring is provided at one end of the first sliding sleeve; a first arc-shaped elastic sheet is provided between the first fixed sleeve and the first sliding sleeve, the first arc-shaped elastic sheet is composed of a first outer metal layer and a first inner metal layer, and the thermal expansion coefficient of the first outer metal layer is greater than the thermal expansion coefficient of the first inner metal layer;

[0017] The second sealing docking mechanism comprises a second fixed sleeve, a second sliding sleeve sleeved outside the second fixed sleeve, the second fixed sleeve is fixedly connected to the inner side of the housing, a second sealing ring is arranged between the second fixed sleeve and the second sliding sleeve, and a second sealing ring is arranged at one end of the second sliding sleeve; a second arc-shaped elastic sheet is arranged between the second fixed sleeve and the second sliding sleeve, the second arc-shaped elastic sheet is composed of a second outer metal layer and a second inner metal layer, and the thermal expansion coefficient of the second outer metal layer is smaller than the thermal expansion coefficient of the second inner metal layer;

[0018] Both ends of the adsorbent cylinder are respectively provided with sealing butt surfaces matched with the first sealing ring or the second sealing ring.

[0019] Preferably, the condensation temperature of the condenser is -15°C to -18°C, and the temperature of the regenerated hot air is 120°C to 150°C.

[0020] The beneficial effects of the present invention are:

[0021] 1. When the present invention treats the gas, the gas to be treated will first pass through the condenser. Under the action of the condenser, most of the vinyl chloride gas in the gas to be treated can be liquefied and separated, and then the vinyl chloride gas is further adsorbed by the adsorbent in the adsorption unit, so that the vinyl chloride component in the gas can be removed more thoroughly. After adsorption by the adsorption unit, the gas can be directly discharged into the atmosphere without affecting the environment.

[0022] 2. In the present invention, an adsorption position and a regeneration position are provided in the housing at the same time. The adsorption unit located at the adsorption position is in a normal adsorption working state, and the adsorption unit located at the regeneration position is in a regeneration state. When the adsorption unit is regenerated, a regeneration hot air with a certain temperature is generated by the regeneration device. The regeneration hot air passes through the adsorption unit located at the regeneration position, and the adsorbent is heated by the regeneration hot air. The binding force between vinyl chloride and the adsorbent is reduced by heating, and the vinyl chloride is removed from the adsorbent under the blowing of the regeneration hot air. The removed vinyl chloride gas is mixed in the regeneration hot air. And a regenerated tail gas is formed. The concentration of vinyl chloride gas in the regenerated tail gas is relatively high. The regenerated tail gas will be passed into a condenser, and the vinyl chloride gas in the regenerated tail gas will be recovered through the condenser, and then discharged into the atmosphere through the adsorption unit on the adsorption position; when the adsorbent is regenerated, the vinyl chloride removed from the adsorbent can be recovered again, thereby further improving the recovery rate of vinyl chloride, and the recovered vinyl chloride monomer can be put back into production, reducing the waste of raw materials, improving economic benefits, and can effectively reduce the impact of vinyl chloride discharged into the atmosphere during the regeneration of the adsorbent on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a pipeline connection schematic diagram of the present invention.

[0024] Figure 2 Schematic diagram of the heat exchanger.

[0025] Figure 3 A cross-sectional view of the adsorption device.

[0026] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0027] Figure 5 for Figure 3 Enlarged view of part B in the middle.

[0028] Figure 6 for Figure 3 Enlarged view of part C in the middle.

[0029] Figure 7 It is a schematic diagram of the structure of the adsorbent cartridge.

[0030] In the figure: 1, condenser, 2, adsorption device, 2-1, shell, 2-2, transposition motor, 2-3, rotating shaft, 2-4, bearing seat, 2-5, adsorbent cylinder, 2-5a, sealing docking surface, 2-6, adsorbent, 2-7, resistance net, 2-8, connector, 2-11, first fixed sleeve, 2-12, first sliding sleeve, 2-13, first sealing ring, 2-14, first arc-shaped elastic sheet, 2-14a, first outer metal layer, 2-14b, first inner metal layer, 2-15, first sealing ring, 2-17, second fixed sleeve, 2-18, second sliding sleeve, 2-19, second sealing ring, 2-20, second arc-shaped elastic sheet, 2-20a, second outer metal layer, 2-20b, second inner metal layer, 2-2 1. Second sealing ring, 2-22. Induction plate, 2-23. Infrared sensor, 2-24. Adsorption position inlet, 2-25. Adsorption position outlet, 2-26. Regeneration position inlet, 2-27. Regeneration position outlet, 3. Heat exchanger, 3-1. First medium inlet, 3-2. First medium outlet, 3-3. Second medium inlet, 3-4. Second medium outlet, 4. Air intake manifold, 5. Adsorption air intake pipe, 6. Adsorption exhaust pipe, 7. Regeneration air intake pipe, 8. Heating component, 9. Regeneration fan, 10. First heat exchange air intake pipe, 11. First heat exchange air outlet pipe, 12. Second heat exchange air intake pipe, 13. Second heat exchange air outlet pipe, 14. Three-way regulating valve, 15. First control valve, 16. Second control valve, 18. Dryer. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0032] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0033] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0034] like Figures 1 to 7 As shown, a vinyl chloride recovery device includes a condenser 1 and an adsorption device 2. The adsorption device 2 includes a shell 2-1 and a position-changing device. The shell 2-1 is provided with an adsorption position and a regeneration position. The position-changing device is provided with two adsorption units filled with adsorbent 2-6. When one of the working units is in the adsorption position, the other adsorption unit is in the regeneration position. The position states of the two adsorption units are switched by the position-changing device. A regeneration device is provided on the shell 2-1. The regeneration device generates regeneration hot air to heat and regenerate the adsorbent 2-6 in the adsorption unit. The condensation temperature of the condenser 1 is lower than the boiling point of the vinyl chloride gas. When the gas is treated, the gas to be treated passes through the condenser 1 and the adsorption unit located at the adsorption position in turn. When the adsorbent 2-6 in the adsorption unit is regenerated, the regeneration hot air generated by the regeneration device passes through the adsorption unit located at the regeneration position to form regeneration tail gas. The regeneration tail gas passes through the condenser 1 and the adsorption unit located at the adsorption position in turn.

[0035] When the present invention treats gas, the gas to be treated will first pass through the condenser 1. Under the action of the condenser 1, most of the vinyl chloride gas in the gas to be treated can be liquefied and separated. After separation by the condenser 1, although the content of vinyl chloride gas in the gas is greatly reduced, it still contains a certain amount of vinyl chloride gas. At this time, the gas after the primary treatment will pass through the adsorption unit in the adsorption device 2, and the vinyl chloride gas will be further adsorbed by the adsorbent 2-6 in the adsorption unit, so that the vinyl chloride component in the gas can be removed more thoroughly. After adsorption by the adsorption unit, the gas can be directly discharged into the atmosphere without affecting the environment.

[0036] After the adsorbent 2-6 has worked for a certain period of time, the adsorbent 2-6 will be saturated, which will cause the adsorbent 2-6 to lose its adsorption effect. In the present invention, an adsorption position and a regeneration position are set in the housing 2-1 at the same time. The adsorption unit located at the adsorption position is in a normal adsorption working state, and the adsorption unit at the regeneration position is in a regeneration state; when the adsorption unit is regenerated, a regeneration hot wind with a certain temperature is generated by the regeneration device, and the regeneration hot wind passes through the adsorption unit located at the regeneration position, and the adsorbent 2-6 is heated by the regeneration hot wind, and the binding force between vinyl chloride and the adsorbent 2-6 is reduced by heating, and the vinyl chloride is removed from the adsorbent 2-6 under the blowing of the regeneration hot wind, and the removed vinyl chloride gas is mixed in the regeneration hot wind and forms a regeneration tail gas, and the vinyl chloride gas concentration in the regeneration tail gas is relatively high, and the regeneration tail gas will be passed into the condenser 1, and the vinyl chloride gas in the regeneration tail gas is recovered by the condenser 1, and then discharged to the atmosphere after passing through the adsorption unit at the adsorption position. In the present invention, when the adsorbent 2-6 is regenerated, the vinyl chloride removed from the adsorbent 2-6 can be recovered again, thereby further improving the recovery rate of vinyl chloride. The recovered vinyl chloride monomer can be put back into production, reducing the waste of raw materials, improving economic benefits, and effectively reducing the impact of vinyl chloride emissions into the atmosphere during the regeneration of the adsorbent 2-6 on the environment.

[0037] When the adsorption unit located at the adsorption position is in the adsorption working state, the adsorption unit located at the regeneration position can perform the regeneration process at the same time; when the adsorbent 2-6 in the adsorption working state reaches saturation and the adsorption unit at the regeneration position completes the regeneration process, the position states of the two adsorption units can be switched through the position conversion device so that the positions of the two adsorption units are interchanged, thereby continuously adsorbing the gas.

[0038] In this embodiment, the adsorbent 2-6 is activated carbon, the condensation temperature of the condenser 1 is -15°C to -18°C, and the temperature of the regenerated hot air is 150°C to 200°C.

[0039] Specifically, the condenser 1 inlet on the condenser 1 is connected to the air intake manifold 4, and the outer shell 2-1 is provided with an adsorption position inlet 2-24, an adsorption position outlet 2-25, a regeneration position inlet 2-26, and a regeneration position outlet 2-27. The adsorption position inlet 2-24 and the adsorption position outlet 2-25 are respectively located on both sides of the adsorption position, and the regeneration position inlet 2-26 and the regeneration position outlet 2-27 are respectively located on both sides of the regeneration position; the condenser 1 outlet on the condenser 1 is connected to the adsorption position inlet 2-24 through the adsorption air intake pipe 5, the adsorption position outlet 2-25 is connected to the adsorption exhaust pipe 6, the regeneration position inlet 2-26 is connected to the regeneration device, and the regeneration position outlet 2-27 is connected to the condenser 1 inlet on the condenser 1 by a pipe.

[0040] Among them, the adsorption air intake pipe 5 is provided with a first control valve 15, and the adsorption air intake pipe 5 is controlled by the first control valve 15. The gas to be treated is introduced into the condenser 1 through the air intake manifold 4, and the gas after condensation treatment is introduced into the adsorption device 2 through the adsorption air intake pipe 5. The gas after adsorption treatment is discharged through the adsorption exhaust pipe 6, and one end of the adsorption exhaust pipe 6 is directly connected to the atmosphere. The regenerated tail gas will be introduced into the condenser 1 through the pipeline to realize the condensation recovery of the vinyl chloride gas in the condenser 1.

[0041] The regeneration device includes a regeneration gas inlet duct 7 and a regeneration fan 9. One end of the regeneration gas inlet duct 7 is connected to the regeneration position inlet 2-26, and the other end of the regeneration gas inlet duct 7 is connected to the air outlet of the regeneration fan 9. A heating component 8 is provided on the regeneration gas inlet duct 7. When the regeneration device is working, air is sucked in through the regeneration fan 9, and the sucked air passes through the heating component 8. The heating component 8 heats the air to form regeneration hot air with a certain temperature. The regeneration hot air passes into the adsorption unit through the regeneration gas inlet duct 7 to regenerate the adsorbent 2-6 inside.

[0042] The present invention also includes a heat exchanger 3, wherein the first medium inlet 3-1 on the heat exchanger 3 is connected to the regeneration position outlet 2-27 via a first heat exchange inlet pipe 10, and the first medium outlet 3-2 on the heat exchanger 3 is connected to the condenser 1 inlet on the condenser 1 via a first heat exchange outlet pipe 11; the second medium inlet 3-3 on the heat exchanger 3 is connected to a second heat exchange inlet pipe 12, and the end of the second heat exchange inlet pipe 12 away from the heat exchanger 3 is connected to the adsorption exhaust pipe 6 via a three-way regulating valve 14; the second medium outlet 3-4 on the heat exchanger 3 is connected to a second heat exchange outlet pipe 13.

[0043] When the adsorbent 2-6 in the adsorption unit is regenerated, the three-way regulating valve 14 is adjusted to make the second heat exchange inlet pipe 12 and the adsorption exhaust pipe 6 connected. At this time, the gas discharged through the adsorption exhaust pipe 6 will enter the heat exchanger 3 through the second heat exchange inlet pipe 12, and then be discharged through the second heat exchange outlet pipe 13 and discharged into the atmosphere; and the regenerated exhaust gas will first enter the heat exchanger 3 through the first heat exchange inlet pipe 10, and then enter the condensation tower through the first heat exchange outlet pipe 11; the gas discharged through the adsorption exhaust pipe 6 has a lower temperature (usually below -10°C) due to the effect of passing through the condenser 1, while the temperature of the regenerated exhaust gas is higher. The gas discharged from the adsorption exhaust pipe 6 and the regenerated exhaust gas are heat exchanged in the heat exchanger 3, and the cold energy of the gas discharged from the adsorption exhaust pipe 6 is fully utilized to cool the regenerated exhaust gas, thereby reducing the initial temperature of the regenerated exhaust gas before entering the condenser 1, which can reduce the energy consumption of the condenser 1, improve the condensation efficiency, and prevent the regenerated exhaust gas from being too high in temperature and causing the condenser 1 to be overloaded.

[0044] The heat exchanger 3 may be a shell-and-tube heat exchanger 3 , a plate heat exchanger 3 , or the like.

[0045] A dryer 18 is provided on the adsorption air inlet pipe 5. Before the gas enters the adsorption unit, the gas is dried by the dryer 18 to further remove its moisture, so as to prevent the moisture in the gas from being brought into the adsorption unit and affecting the adsorption efficiency of the adsorbent 2-6.

[0046] The transposition device includes a transposition motor 2-2, a rotating shaft 2-3 rotatably arranged in a housing 2-1, one end of the rotating shaft 2-3 is connected to the motor, and the motor is fixedly connected to the housing 2-1; two adsorption units are fixedly connected to the rotating shaft 2-3. Two sensing sheets 2-22 are arranged on the rotating shaft 2-3, and an infrared sensor 2-23 corresponding to the sensing sheets 2-22 is arranged on the inner side of the housing 2-1; when one of the adsorption units is in the adsorption position, the infrared sensor 2-23 corresponds to one of the sensing sheets 2-22 on the rotating shaft 2-3.

[0047] Among them, a bearing seat 2-4 is provided in the outer shell 2-1, and one end of the rotating shaft 2-3 is connected to the bearing seat 2-4. The two adsorption units are symmetrically arranged on both sides of the rotating shaft 2-3, and the adsorption units and the rotating shaft 2-3 are connected through a connector 2-8. The rotating shaft 2-3 rotates 180 degrees, so that the positions of the two adsorption units can be interchanged. The two induction plates 2-22 are symmetrically arranged on both sides of the rotating shaft 2-3. When the adsorption units are transposed, when the induction plates 2-22 on the rotating shaft 2-3 rotate to align with the infrared sensor 2-23, it indicates that the rotating shaft 2-3 has rotated into place, and the transposition motor 2-2 stops rotating.

[0048] The adsorption unit includes an adsorbent cylinder 2-5, both ends of which are provided with openings, and the adsorbent cylinder 2-5 is filled with adsorbent 2-6; when the adsorbent 2-6 unit is in the adsorption position, the openings at both ends of the adsorbent cylinder 2-5 correspond to the adsorption position inlet 2-24 and the adsorption position outlet 2-25 on both sides of the adsorption position; when the adsorbent 2-6 unit is in the regeneration position, the openings at both ends of the adsorbent cylinder 2-5 correspond to the regeneration position inlet 2-26 and the regeneration position outlet 2-27 on both sides of the regeneration position. Resistance nets 2-7 are provided on both sides of the adsorbent cylinder 2-5, and the adsorbent 2-6 is filled between the resistance nets 2-7.

[0049] A first sealing docking mechanism is provided on the inner side of the adsorption position inlet 2-24 and the adsorption position outlet 2-25, and a second sealing docking mechanism is provided on the inner side of the regeneration position inlet 2-26 and the regeneration position outlet 2-27; the first sealing docking mechanism includes a first fixed sleeve 2-11 and a first sliding sleeve 2-12 sleeved on the outer side of the first fixed sleeve 2-11, the first fixed sleeve 2-11 is fixedly connected to the inner side of the outer shell 2-1, a first sealing ring 2-13 is provided between the first fixed sleeve 2-11 and the first sliding sleeve 2-12, and a first sealing ring 2-15 is provided at one end of the first sliding sleeve 2-12. A first arc-shaped elastic sheet 2-14 is provided between the first fixed sleeve 2-11 and the first sliding sleeve. The first arc-shaped elastic sheet 2-14 is composed of a first outer metal layer 2-14a and a first inner metal layer 2-14b. The first outer metal layer 2-14a is located outside the arc of the first inner metal layer 2-14b. The thermal expansion coefficient of the first outer metal layer 2-14a is greater than the thermal expansion coefficient of the first inner metal layer 2-14b. In this embodiment, four first arc-shaped elastic sheets are provided between the first fixed sleeve 2-11 and the first sliding sleeve. The four first arc-shaped elastic sheets are arranged in a circular array on the periphery of the first fixed sleeve 2-11.

[0050] The second sealing docking mechanism includes a second fixed sleeve 2-17, a second sliding sleeve 2-18 sleeved outside the second fixed sleeve 2-17, the second fixed sleeve 2-17 is fixedly connected to the inner side of the housing 2-1, a second sealing ring 2-19 is provided between the second fixed sleeve 2-17 and the second sliding sleeve 2-18, and a second sealing ring 2-21 is provided at one end of the second sliding sleeve 2-18; a second arc-shaped elastic sheet 2-20 is provided between the second fixed sleeve 2-17 and the second sliding sleeve, and the second arc-shaped elastic sheet 2-20 is composed of a second outer metal layer 2-20a and a second inner metal layer 2-20b, the second outer metal layer 2-20a is located outside the arc of the second inner metal layer 2-20b, and the thermal expansion coefficient of the second outer metal layer 2-20a is less than the thermal expansion coefficient of the second inner metal layer 2-20b. In this embodiment, four second arc-shaped elastic sheets are provided between the second fixed sleeve 2-17 and the second sliding sleeve, and the four second arc-shaped elastic sheets are arranged in a circular array on the periphery of the second fixed sleeve 2-17.

[0051] Both ends of the adsorbent cylinder 2-5 are respectively provided with sealing docking surfaces 2-5a that cooperate with the first sealing ring 2-15 or the second sealing ring 2-21.

[0052] Among them, the first sealing docking structure is used to achieve a sealed connection between the adsorption position inlet 2-24, the adsorption position outlet 2-25 and the openings at both ends of the adsorbent cylinder 2-5; at room temperature, the first sealing ring 2-15 on the first sliding sleeve contacts the sealing docking surface 2-5a on the adsorbent cylinder 2-5 and maintains a certain contact pressure; when the adsorption operation is performed, the gas with a lower temperature (below minus 10 degrees Celsius) after passing through the condenser 1 will pass through the first sealing docking mechanism. At this time, the temperature of the first arc-shaped elastic sheet 2-14 is reduced. Since the first arc-shaped elastic sheet 2-14 is composed of a first outer metal layer 2-14a and a first inner metal layer 2-14b and the thermal expansion coefficient of the first outer metal layer 2-14a is greater than that of the first inner metal layer 2-14b, the thermal expansion coefficient of the first outer metal layer 2-14a is greater than that of the first inner metal layer 2-14b. The thermal expansion coefficient of the metal layer 2-14b causes the first outer metal layer 2-14a to shrink more than the first inner metal layer 2-14b when the temperature of the first arc-shaped elastic sheet 2-14 drops, causing the first arc-shaped elastic sheet 2-14 to deform toward a more straight direction (i.e., the distance between the two ends of the first arc-shaped elastic sheet 2-14 increases), thereby increasing the forward thrust of the first arc-shaped elastic sheet 2-14 on the first sliding sleeve, thereby increasing the contact pressure between the first sealing ring 2-15 and the sealing docking surface 2-5a on the adsorbent cylinder 2-5, and improving the sealing between the adsorbent cylinder 2-5 and the adsorption position inlet 2-24 and the adsorption position outlet 2-25, thereby preventing gas leakage during the adsorption process. When it is necessary to switch the position status of the two adsorption units, it is only necessary to stop supplying gas to the adsorption unit at the adsorption position and restore the first arc-shaped elastic sheet 2-14 on the first sealing docking structure to room temperature. At this time, as the temperature rises, the first arc-shaped elastic sheet 2-14 will also return to its initial state, thereby reducing the thrust of the first arc-shaped elastic sheet 2-14 on the first sliding sleeve, and reducing the contact pressure between the adsorbent cylinder 2-5 and the first sealing ring 2-15, so that the adsorbent cylinder 2-5 can be easily moved away from the current position to achieve position switching.

[0053] The second sealing docking mechanism is used to achieve a sealed connection between the regeneration position inlet 2-26, the regeneration position outlet 2-27 and the openings at both ends of the adsorbent cylinder 2-5; the second sealing docking mechanism is similar in principle to the first sealing docking mechanism. At room temperature, the second sealing ring 2-21 on the second sliding sleeve contacts the sealing docking surface 2-5a on the adsorbent cylinder 2-5 and maintains a certain contact pressure; when the adsorbent 2-6 is being regenerated, the hot regeneration air with a higher temperature will pass through the second sealing docking mechanism. At this time, the temperature of the second arc-shaped elastic sheet 2-20 rises. Since the second arc-shaped elastic sheet 2-20 is composed of a second outer metal layer 2-20a and a second inner metal layer 2-20b, and the thermal expansion coefficient of the second outer metal layer 2-20a is smaller than the thermal expansion coefficient of the second inner metal layer 2-20b, this causes the second arc-shaped elastic sheet 2-20 to be hotter than the second inner metal layer 2-20b. When the pressure rises, the thermal expansion of the second inner metal layer 2-20b is greater than the thermal expansion of the second outer metal layer 2-20a, which causes the second arc-shaped elastic sheet 2-20 to deform toward a more straight trend (i.e., the distance between the two ends of the second arc-shaped elastic sheet 2-20 increases), thereby increasing the forward thrust of the second arc-shaped elastic sheet 2-20 on the second sliding sleeve, thereby increasing the contact pressure between the second sealing ring 2-21 and the sealing docking surface 2-5a on the adsorbent cylinder 2-5, and improving the sealing between the adsorbent cylinder 2-5 and the regeneration position inlet 2-26 and the regeneration position outlet 2-27, thereby preventing gas leakage during the adsorption process. When it is necessary to switch the position status of the two adsorption units, it is only necessary to restore the second arc-shaped elastic sheet 2-20 on the second sealing docking structure to room temperature. At this time, as the temperature drops, the second arc-shaped elastic sheet 2-20 will also return to its initial state, so that the thrust of the second arc-shaped elastic sheet 2-20 on the second sliding sleeve is reduced, and the contact pressure between the adsorbent cylinder 2-5 and the second sealing ring 2-21 is reduced, so that the adsorbent cylinder 2-5 can be easily moved away from the current position to achieve position switching.

[0054] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A vinyl chloride recovery device, characterized in that: It includes a condenser and an adsorption device. The adsorption device includes a shell and a transposition device. The shell is provided with an adsorption position and a regeneration position. The transposition device is provided with two adsorption units filled with adsorbent. When one of the working units is in the adsorption position, the other adsorption unit is in the regeneration position. The position states of the two adsorption units are switched by the transposition device. The shell is provided with a regeneration device. The regeneration device generates regeneration hot air to heat and regenerate the adsorbent in the adsorption unit. The condensation temperature of the condenser is lower than the boiling point of vinyl chloride gas. When treating the gas, the gas to be treated passes through the condenser and the adsorption unit located at the adsorption position in sequence; when regenerating the adsorbent in the adsorption unit, the regeneration hot air generated by the regeneration device passes through the adsorption unit located at the regeneration position to form regeneration tail gas, and the regeneration tail gas passes through the condenser and the adsorption unit located at the adsorption position in sequence; The adsorption unit comprises an adsorbent cylinder, both ends of which are respectively provided with openings, and the adsorbent cylinder is filled with adsorbent; when the adsorbent unit is in the adsorption position, the openings at both ends of the adsorbent cylinder respectively correspond to the adsorption position inlet and the adsorption position outlet on both sides of the adsorption position; when the adsorbent unit is in the regeneration position, the openings at both ends of the adsorbent cylinder respectively correspond to the regeneration position inlet and the regeneration position outlet on both sides of the regeneration position; The inner sides of the adsorption position inlet and the adsorption position outlet are both provided with a first sealing docking mechanism, and the inner sides of the regeneration position inlet and the regeneration position outlet are both provided with a second sealing docking mechanism; the first sealing docking mechanism includes a first fixed sleeve, a first sliding sleeve sleeved on the outside of the first fixed sleeve, the first fixed sleeve is fixedly connected to the inner side of the shell, a first sealing ring is provided between the first fixed sleeve and the first sliding sleeve, and a first sealing ring is provided at one end of the first sliding sleeve; a first arc-shaped elastic sheet is provided between the first fixed sleeve and the first sliding sleeve, the first arc-shaped elastic sheet is composed of a first outer metal layer and a first inner metal layer, and the thermal expansion coefficient of the first outer metal layer is greater than that of the first inner metal layer. side metal layer's thermal expansion coefficient; the second sealing docking mechanism comprises a second fixed sleeve, a second sliding sleeve sleeved on the outside of the second fixed sleeve, the second fixed sleeve is fixedly connected to the inner side of the outer shell, a second sealing ring is provided between the second fixed sleeve and the second sliding sleeve, and a second sealing ring is provided at one end of the second sliding sleeve; a second arc-shaped elastic sheet is provided between the second fixed sleeve and the second sliding sleeve, the second arc-shaped elastic sheet is composed of a second outer metal layer and a second inner metal layer, the thermal expansion coefficient of the second outer metal layer is smaller than the thermal expansion coefficient of the second inner metal layer; both ends of the adsorbent cylinder are respectively provided with sealing docking surfaces matching with the first sealing ring or the second sealing ring.

2. A vinyl chloride recovery device according to claim 1, characterized in that: The condenser inlet on the condenser is connected to the air intake main pipe, and the outer shell is provided with an adsorption position inlet, an adsorption position outlet, a regeneration position inlet and a regeneration position outlet. The adsorption position inlet and the adsorption position outlet are respectively located on both sides of the adsorption position, and the regeneration position inlet and the regeneration position outlet are respectively located on both sides of the regeneration position; the condenser outlet on the condenser is connected to the adsorption position inlet through an adsorption air intake pipe, the adsorption position outlet is connected to an adsorption exhaust pipe, the regeneration position inlet is connected to the regeneration device, and the regeneration position outlet and the condenser inlet on the condenser are connected by a pipe.

3. A vinyl chloride recovery device according to claim 2, characterized in that: The regeneration device comprises a regeneration gas inlet pipeline and a regeneration fan. One end of the regeneration gas inlet pipeline is connected to the inlet of the regeneration position, and the other end of the regeneration gas inlet pipeline is connected to the outlet of the regeneration fan. A heating component is provided on the regeneration gas inlet pipeline.

4. A vinyl chloride recovery device according to claim 2, characterized in that: It also includes a heat exchanger, wherein the first medium inlet on the heat exchanger is connected to the regeneration position outlet via a first heat exchange inlet pipe, and the first medium outlet on the heat exchanger is connected to the condenser inlet on the condenser via a first heat exchange outlet pipe; the second medium inlet on the heat exchanger is connected to a second heat exchange inlet pipe, and the end of the second heat exchange inlet pipe away from the heat exchanger is connected to the adsorption exhaust pipe via a three-way regulating valve; the second medium outlet on the heat exchanger is connected to a second heat exchange outlet pipe.

5. A vinyl chloride recovery device according to claim 2, characterized in that: A dryer is provided on the adsorption air inlet pipeline.

6. A vinyl chloride recovery device according to claim 1, characterized in that: The transposition device comprises a transposition motor and a rotating shaft rotatably arranged in a shell, one end of the rotating shaft is connected to the motor, and the motor is fixedly connected to the shell; and both adsorption units are fixedly connected to the rotating shaft.

7. A vinyl chloride recovery device according to claim 6, characterized in that: Two sensing sheets are arranged on the rotating shaft, and infrared sensors corresponding to the sensing sheets are arranged on the inner side of the shell; when one of the adsorption units is located at the adsorption position, the infrared sensor corresponds to one of the sensing sheets on the rotating shaft.

8. A vinyl chloride recovery device according to claim 1, characterized in that: The condensation temperature of the condenser is -15°C to -18°C, and the temperature of the regenerated hot air is 150°C to 200°C.

Images