Multi-layer filter screen adsorption type demethanization tail gas recovery device

Abstract

The utility model relates to the technical field of accessory devices of tail gas recovery devices, in particular to a multi-layer filter screen adsorption type demethanization tail gas recovery device which is simple in structure and is used for separating demethanization tail gas through a membrane separation method and a pressure swing adsorption method so as to improve the recovery efficiency and reduce the cost. Therefore, the practicability of the multi-layer filter screen adsorption type demethanization tail gas recovery device is enhanced. Comprising a recovery device shell, a cavity is formed in the recovery device shell, four sets of supporting legs are arranged at the bottom end of the recovery device, the recovery device further comprises a first fixing frame, a second fixing frame and a third fixing frame, a demethanization tail gas preliminary filtering assembly is arranged at the left end of the recovery device shell, and a gas inlet pipe is arranged at the left end of the demethanization tail gas preliminary filtering assembly; a first fixing frame, a second fixing frame and a third fixing frame are arranged in the cavity, and membrane separation assemblies are arranged on the first fixing frame, the second fixing frame and the third fixing frame.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for exhaust gas recovery devices, and in particular to a multi-layer filter adsorption type demethanizing exhaust gas recovery device. Background Technology

[0002] Demethanizing tail gas refers to the gas emitted after treatment by a demethanizing tower during petroleum refining or chemical processes. In processes such as methanol-to-olefins (MTO) or methanol-to-propylene (MTP), demethanizing towers are used to separate and remove light components such as methane. During this process, the tail gas emitted from the top of the tower mainly contains methane, hydrogen, nitrogen, and small amounts of low-carbon olefins such as ethylene and propylene. This tail gas typically requires recycling to improve resource utilization efficiency and environmental performance.

[0003] Existing methane tail gas recovery devices suffer from problems such as low recovery efficiency, complex structure, and high cost. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-layer filter adsorption type demethanizing tail gas recovery device with a simple structure that separates demethanizing tail gas through membrane separation and pressure swing adsorption, thereby improving recovery efficiency and reducing costs, thus enhancing practicality.

[0005] This utility model discloses a multi-layer filter adsorption type demethanizing tail gas recovery device, including a recovery device shell, an internal chamber, four sets of support legs at the bottom of the recovery device, a first fixed frame, a second fixed frame, and a third fixed frame. A demethanizing tail gas preliminary filtration assembly is provided at the left end of the recovery device shell, and an air inlet pipe is provided at the left end of the demethanizing tail gas preliminary filtration assembly. The first fixed frame, the second fixed frame, and the third fixed frame are provided in the chamber, and each of the first fixed frame, the second fixed frame, and the third fixed frame is provided with a membrane separation assembly. Four sets of recovery pipes are provided at the right end of the recovery device shell, a first cover plate assembly is provided at the top of the recovery device shell, and a pressurization pipe is provided at the rear end of the recovery device shell. Solenoid valves are respectively provided on the pressurization pipe, the air inlet pipe, and the four sets of recovery pipes.

[0006] Preferably, the membrane separation assembly includes a first fixing ring, a second fixing ring, a third fixing ring, and multiple sets of clamping blocks. The inner end of the first fixing ring is provided with a hydrogen separation membrane, the inner end of the second fixing ring is provided with a nitrogen separation membrane, and the inner end of the third fixing ring is provided with a low-carbon olefin separation membrane. The top ends of the first fixing frame, the second fixing frame, and the third fixing frame are respectively provided with fixing grooves, and the bottom ends of the three sets of fixing grooves are respectively provided with four sets of clamping grooves. The bottom ends of the first fixing frame, the second fixing frame, and the third fixing frame are respectively connected to the four sets of clamping blocks, and the multiple sets of clamping blocks are respectively clamped to the clamping grooves. The first fixing frame, the second fixing frame, and the third fixing frame are clamped and fixed to the first fixing ring, the second fixing ring, and the third fixing ring by clamping and fixing components.

[0007] Preferably, the clamping and fixing assembly includes four sets of first screws and eight sets of electric cylinders. The top of the first fixing ring is provided with four sets of first through holes, and the bottom of the top fixing groove is provided with four sets of first threaded holes. The four sets of first screws pass through the first through holes and are threadedly connected to the first threaded holes. The tops of the second fixing frame and the third fixing frame are respectively provided with four sets of first grooves. The bottoms of the eight sets of first grooves are respectively connected to the electric cylinders. The inner ends of the eight sets of electric cylinders are provided with pneumatic rods. The eight sets of pneumatic rods are respectively slidably inserted into the fixing grooves. The outer walls of the second fixing ring and the third fixing ring are respectively provided with four sets of clamping holes. The eight sets of pneumatic rods are respectively slidably clamped into the clamping holes. The tops of the second fixing frame and the third fixing frame are respectively provided with cover assemblies.

[0008] Preferably, the cover assembly includes eight sets of covers and multiple sets of second screws. The top of the second fixing bracket and the third fixing bracket are respectively provided with four sets of hidden grooves. The eight sets of hidden grooves are slidably fitted with the covers. The top of the eight sets of covers are respectively provided with four sets of second through holes. The bottom of the eight sets of hidden grooves are respectively provided with four sets of second threaded holes. The multiple sets of second screws pass through the second through holes and are threadedly connected to the second threaded holes.

[0009] Preferably, it also includes a first handle ring, a second handle ring, and a third handle ring, with the top end of the first fixing ring connected to the first handle ring, the top end of the second fixing ring connected to the second handle ring, and the top end of the third fixing ring connected to the third handle ring.

[0010] Preferably, the cover plate assembly includes a cover plate and four sets of third screws. The top of the cover plate is provided with four sets of mounting through holes, and the top of the housing of the recycling device is provided with four sets of mounting threaded holes. The four sets of third screws are respectively threadedly connected to the mounting through holes and the mounting threaded holes.

[0011] Preferably, the preliminary filtration assembly for demethanized tail gas includes an adsorption filter box, a drawer, a baffle, two sets of screens, and a fourth handle. The left end of the outer shell of the recovery device is connected to the adsorbent filter box. A through-hole is provided at the left end of the outer shell of the recovery device, which communicates with the adsorbent filter box. An air inlet pipe is provided at the left end of the adsorbent filter box, and a solenoid valve is provided on the air inlet pipe. A drawer opening is provided at the front end of the adsorbent filter box, and the drawer opening is slidably fitted with the drawer. The front end of the drawer is connected to the baffle. The front end of the baffle is provided with four sets of third through holes. The front end of the adsorbent filter box is provided with four sets of first threaded holes. Four sets of fifth screws pass through the third through holes and are threadedly connected to the first threaded holes. Two sets of ventilation slots are provided at the top of the drawer. The front and rear ends of the two sets of ventilation slots are respectively provided with locking slides. The two sets of screens are slidably locked into the two sets of locking slides. Activated carbon is provided in the drawer. The front end of the baffle is connected to the fourth handle.

[0012] Preferably, the four sets of mounting through holes, the four sets of three through holes, the four sets of first through holes, and the multiple sets of second through holes are all countersunk holes.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention achieves effective separation of multiple components in demethanizing tail gas by combining membrane separation and pressure swing adsorption. The hydrogen separation membrane, nitrogen separation membrane, and low-carbon olefin separation membrane efficiently screen different gas components, improving the recovery rate of target gases (such as hydrogen, nitrogen, and low-carbon olefins) and reducing the waste of valuable gases. Furthermore, this invention employs a modular multi-layer filter adsorption assembly, which allows for quick installation and disassembly via a snap-fit ​​fixing component. This simplifies the overall structure of the equipment and facilitates maintenance and filter replacement. Secondly, the membrane separation components on the second and third fixing frames can be easily fixed and disassembled using a pneumatic rod controlled by an electric cylinder, greatly improving operational convenience and flexibility. Finally, by effectively recovering and treating methane and other light components in the demethanizing tail gas, this invention helps reduce greenhouse gas emissions, which is of positive significance for environmental protection. This improves recovery efficiency and reduces costs, thereby enhancing practicality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the connection structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection structure between the second fixing ring and the second handle ring of this utility model;

[0016] Figure 3 This is a top view of the structure of this utility model;

[0017] Figure 4 This is a partially enlarged structural diagram of part A of this utility model;

[0018] The attached diagram shows the following components: 1. Outer casing of the recovery device; 2. Chamber; 3. Support leg; 4. First fixing frame; 5. Second fixing frame; 6. Third fixing frame; 7. Inlet pipe; 8. Recovery pipe; 9. Pressurization pipe; 10. Solenoid valve; 11. First fixing ring; 12. Second fixing ring; 13. Third fixing ring; 14. Hydrogen separation membrane; 15. Nitrogen separation membrane; 16. Low-carbon olefin separation membrane; 17. Mounting block; 18. First screw; 19. Electric cylinder; 20. Pneumatic rod; 21. Cover; 22. Second screw; 23. First handle ring; 24. Second handle ring; 25. Third handle ring; 26. Cover plate; 27. Third screw; 28. Adsorption filter box; 29. ​​Drawer; 30. Baffle; 31. Sieve screen; 32. Fourth handle; 33. Fifth screw; 34. Activated carbon. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] like Figures 1 to 4 As shown, this utility model discloses a multi-layer filter adsorption type demethanizing tail gas recovery device, including a recovery device shell 1, a chamber 2 inside the recovery device shell 1, four sets of support legs 3 at the bottom of the recovery device, a first fixing frame 4, a second fixing frame 5, and a third fixing frame 6. A demethanizing tail gas preliminary filtration assembly is provided at the left end of the recovery device shell 1, and an air inlet pipe 7 is provided at the left end of the demethanizing tail gas preliminary filtration assembly. The first fixing frame 4, the second fixing frame 5, and the third fixing frame 6 are provided in the chamber 2, and each of the first fixing frame 4, the second fixing frame 5, and the third fixing frame 6 is equipped with a membrane separation assembly. Four sets of recovery pipes 8 are provided at the right end of the recovery device shell 1, a first cover plate 26 assembly is provided at the top end of the recovery device shell 1, and a pressurization pipe 9 is provided at the rear end of the recovery device shell 1. Solenoid valves 10 are respectively provided on the pressurization pipe 9, the air inlet pipe 7, and the four sets of recovery pipes 8. This utility model combines membrane separation and pressure swing adsorption. This invention achieves effective separation of multiple components in demethanization tail gas. Hydrogen, nitrogen, and low-carbon olefin separation membranes are used to efficiently screen different gas components, improving the recovery rate of target gases (such as hydrogen, nitrogen, and low-carbon olefins) and reducing the waste of valuable gases. Furthermore, the modular multi-layer filter adsorption assembly allows for quick installation and disassembly via a snap-fit ​​fixing component, simplifying the overall structure of the equipment and facilitating filter maintenance and replacement. The membrane separation components on the second and third fixing frames can be easily fixed and disassembled using a pneumatic rod controlled by an electric cylinder, greatly enhancing operational convenience and flexibility. Finally, by effectively recovering methane and other light components from the demethanization tail gas, this invention helps reduce greenhouse gas emissions, contributing positively to environmental protection, thereby improving recovery efficiency and reducing costs, thus enhancing its practicality.

[0021] As a preferred embodiment of the above embodiment, the membrane separation assembly includes a first fixing ring 11, a second fixing ring 12, a third fixing ring 13, and multiple sets of clamping blocks 17. A hydrogen separation membrane 14 is disposed at the inner end of the first fixing ring 11, a nitrogen separation membrane 15 is disposed at the inner end of the second fixing ring 12, and a low-carbon olefin separation membrane 16 is disposed at the inner end of the third fixing ring 13. Fixing grooves are respectively disposed at the top ends of the first fixing frame 4, the second fixing frame 5, and the third fixing frame 6, and four sets of clamping grooves are respectively disposed at the bottom ends of the three sets of fixing grooves. The bottom end of the frame 6 is connected to four sets of locking blocks 17 respectively. The multiple sets of locking blocks 17 are respectively locked into the locking slots. The first fixing frame 4, the second fixing frame 5 and the third fixing frame 6 are locked and fixed to the first fixing ring 11, the second fixing ring 12 and the third fixing ring 13 through the locking fixing components. This utility model uses the fixing slots to slide and lock the three sets of fixing rings, which facilitates the fixing of the three sets of fixing rings. Moreover, the multiple sets of locking blocks and locking slots can effectively lock and fix the fixing, which facilitates the locking and fixing between the fixing rings and the fixing frame in the later stage, thereby enhancing the practicality.

[0022] As a preferred embodiment of the above embodiment, the clamping and fixing assembly includes four sets of first screws 18 and eight sets of electric cylinders 19. The top of the first fixing ring 11 has four sets of first through holes, and the bottom of the top fixing groove has four sets of first threaded holes. The four sets of first screws 18 pass through the first through holes and are threadedly connected to the first threaded holes. The tops of the second fixing bracket 5 and the third fixing bracket 6 each have four sets of first grooves, and the bottoms of the eight sets of first grooves are connected to the electric cylinders 19. The inner ends of the eight sets of electric cylinders 19 are provided with pneumatic rods 20, which slide into the fixing grooves. The second fixing ring 11... Four sets of locking holes are respectively provided on the outer walls of the second and third fixing rings 13. Eight sets of pneumatic rods 20 are slidably locked into the locking holes. The top of the second fixing frame 5 and the third fixing frame 6 are respectively provided with cover 21 assemblies. After the second fixing plate and the third fixing plate are placed, the eight sets of electric cylinders are activated. The eight sets of electric cylinders drive the pneumatic rods to lock into the locking holes, thereby fixing the second fixing plate and the third fixing plate. Then, the first fixing ring is fixed by four sets of first screws, which facilitates the installation and disassembly of the second fixing plate, the third fixing plate and the first fixing plate, thus enhancing practicality.

[0023] As a preferred embodiment of the above, the cover 21 assembly includes eight sets of covers 21 and multiple sets of second screws 22. The top ends of the second fixing bracket 5 and the third fixing bracket 6 are respectively provided with four sets of hidden grooves. The eight sets of hidden grooves are slidably fitted with the covers 21. The top ends of the eight sets of covers 21 are respectively provided with four sets of second through holes. The bottom ends of the eight sets of hidden grooves are respectively provided with four sets of second threaded holes. The multiple sets of second screws 22 pass through the second through holes and are threadedly connected to the second threaded holes. The covers and multiple sets of second screws can be used to seal the fixing grooves to prevent exhaust gas from corroding the electric cylinder, thereby enhancing practicality.

[0024] As a preferred embodiment of the above, the cover plate assembly includes a cover plate 26 and four sets of third screws 27. The top of the cover plate 26 is provided with four sets of mounting through holes, and the top of the recycling device housing 1 is provided with four sets of mounting threaded holes. The four sets of third screws 27 are respectively threadedly connected to the mounting through holes and the mounting threaded holes. The top of the recycling device housing can be opened and closed by the cover plate and the four sets of third screws, thereby facilitating the replacement of the three sets of separation membranes and thus enhancing practicality.

[0025] As a preferred embodiment of the above embodiment, the preliminary filtration assembly for demethanized tail gas includes an adsorption filter box 28, a drawer 29, a baffle 30, two-component screens 31, and a fourth handle 32. The left end of the recovery device housing 1 is connected to the adsorbent filter box, and a through-hole is provided at the left end of the recovery device housing 1, which communicates with the adsorbent filter box. An air inlet pipe is provided at the left end of the adsorbent filter box, and a solenoid valve 10 is provided on the air inlet pipe. A drawer 29 opening is provided at the front end of the adsorbent filter box, and the drawer 29 opening and drawer 29 are slidably fitted together. The front end of the drawer 29 is connected to the baffle 30, and the front end of the baffle 30 is provided with four sets of third through holes. The front end of the adsorbent filter box is provided with four sets of first threaded holes and four sets of fifth screws 32. 3. The first threaded hole is threaded through the third through hole and connected to the third threaded hole respectively. The top of the drawer 29 is provided with two sets of ventilation slots. The front and rear ends of the two sets of ventilation slots are respectively provided with locking slides. The two sets of screens 31 are respectively slidably locked with the two sets of locking slides. Activated carbon 34 is provided in the drawer 29. The front end of the baffle 30 is connected to the fourth handle 32. Methane, ethylene and propylene in the exhaust gas can be adsorbed by the two sets of molecular sieves and activated carbon on the drawer in the adsorbent filter box, which facilitates the subsequent extraction of methane, ethylene and propylene. When extraction is required, the fifth screw of the fifth set is removed and the drawer is pulled out by hand. Then the activated carbon and the two sets of locking molecular sieves are removed for extraction, thereby enhancing practicality.

[0026] As a preferred embodiment of the above, the four sets of mounting through holes, the four sets of three through holes, the four sets of first through holes, and the multiple sets of second through holes are all set as countersunk holes; the four sets of first screws, the four sets of second screws, the multiple sets of third screws, and the four sets of fifth screws can be hidden through the countersunk holes, thereby maintaining the aesthetics of the equipment and enhancing its practicality.

[0027] This utility model discloses a multi-layer filter adsorption-type demethanizing tail gas recovery device. Its working principle is as follows: First, the equipment is placed in a suitable location. Then, the inlet pipe, pressurizing pipe, and four sets of recovery pipes are connected to the upper or lower stage. The tail gas first enters the adsorbent filter box through the inlet pipe, and then methane, ethylene, and propylene are extracted from the tail gas through two sets of molecular sieves and activated carbon. The tail gas then enters the chamber, where it passes through a low-carbon olefin separation membrane to block unextracted gases such as methane, ethylene, and propylene. The pressurizing pipe then pressurizes the chamber. The inlet pipe continuously injects gas into the chamber, and the pressurizing pipe continuously increases the pressure within the chamber. The low-carbon olefins, hydrogen, and nitrogen in the tail gas then move upwards through the low-carbon olefin separation membrane, and are then separated in stages through hydrogen and nitrogen separation membranes. Finally, the different gases in the tail gas are recovered through the recovery pipes. Gas passing through the low-carbon olefin separation membrane is discharged through the bottom recovery pipe, ensuring the recovery and reuse of valuable gases in the exhaust gas. When it is necessary to replace the activated carbon or molecular sieve, remove the fourth set of fifth screws, then take out the drawer using the handle, and then replace the adsorbed molecular sieve and activated carbon. After that, put the new activated carbon and molecular sieve back into the drawer, and then reinstall the drawer using the fourth set of fifth screws. When replacing the three sets of separation membranes, remove the fourth set of third screws, then open the cover plate, and then release the first fixing ring using the fourth set of first screws. Then, start the eight sets of electric cylinders to retract all the pneumatic rods, and then remove and replace the handle rings on the three sets of fixing rings using the overhead crane. After that, start the eight sets of electric cylinders to first clamp and fix the bottom two sets of fixing rings, and then fix the first fixing ring using the fourth set of first screws. Finally, reinstall the cover plate using the fourth set of third screws.

[0028] The terms “vertical,” “horizontal,” “left,” “right,” and similar expressions used in this article are for illustrative purposes only.

[0029] In this utility model, the terms "first," "second," and "third" do not represent a specific quantity or order, but are merely used to distinguish names.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-layer filter adsorption type demethanizing tail gas recovery device, comprising a recovery device shell (1), a chamber (2) disposed inside the recovery device shell (1), and four sets of support legs (3) disposed at the bottom end of the recovery device; characterized in that, It also includes a first fixed frame (4), a second fixed frame (5) and a third fixed frame (6). A demethanizing tail gas preliminary filter assembly is provided at the left end of the recovery device housing (1). An air inlet pipe (7) is provided at the left end of the demethanizing tail gas preliminary filter assembly. The first fixed frame (4), the second fixed frame (5) and the third fixed frame (6) are provided in the chamber (2). A membrane separation assembly is provided in the first fixed frame (4), the second fixed frame (5) and the third fixed frame (6). Four sets of recovery pipes (8) are provided at the right end of the recovery device housing (1). A first cover plate assembly is provided at the top of the recovery device housing (1). A pressurizing pipe (9) is provided at the rear end of the recovery device housing (1). Solenoid valves (10) are provided on the pressurizing pipe (9), the air inlet pipe (7) and the four sets of recovery pipes (8).

2. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 1, characterized in that, The membrane separation assembly includes a first fixing ring (11), a second fixing ring (12), a third fixing ring (13), and multiple sets of clamping blocks (17). The inner end of the first fixing ring (11) is provided with a hydrogen separation membrane (14), the inner end of the second fixing ring (12) is provided with a nitrogen separation membrane (15), and the inner end of the third fixing ring (13) is provided with a low-carbon olefin separation membrane (16). The top ends of the first fixing frame (4), the second fixing frame (5), and the third fixing frame (6) are respectively provided with fixing grooves, and the bottom ends of the three sets of fixing grooves are respectively provided with four sets of clamping grooves. The bottom ends of the first fixing frame (4), the second fixing frame (5), and the third fixing frame (6) are respectively connected to the four sets of clamping blocks (17), and the multiple sets of clamping blocks (17) are respectively clamped to the clamping grooves. The first fixing frame (4), the second fixing frame (5), and the third fixing frame (6) are clamped to the first fixing ring (11), the second fixing ring (12), and the third fixing ring (13) by clamping fixing assembly.

3. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 2, characterized in that, The fastening assembly has four sets of first screws (18) and eight sets of electric cylinders (19). The top of the first fixing ring (11) is provided with four sets of first through holes, and the bottom of the top fixing groove is provided with four sets of first threaded holes. The four sets of first screws (18) pass through the first through holes and are threadedly connected to the first threaded holes. The top of the second fixing frame (5) and the third fixing frame (6) are respectively provided with four sets of first grooves. The bottom of the eight sets of first grooves are respectively connected to the electric cylinders (19). The inner end of the eight sets of electric cylinders (19) is provided with pneumatic rods (20). The eight sets of pneumatic rods (20) are respectively slidably inserted into the fixing grooves. The outer walls of the second fixing ring (12) and the third fixing ring (13) are respectively provided with four sets of fastening holes. The eight sets of pneumatic rods (20) are respectively slidably fastened to the fastening holes. The top of the second fixing frame (5) and the third fixing frame (6) are respectively provided with cover (21) assemblies.

4. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 3, characterized in that, The cover (21) assembly includes eight sets of covers (21) and multiple sets of second screws (22). The top of the second fixing bracket (5) and the third fixing bracket (6) are respectively provided with four sets of hidden grooves. The eight sets of hidden grooves are slidably fitted with the covers (21). The top of the eight sets of covers (21) are respectively provided with four sets of second through holes. The bottom of the eight sets of hidden grooves are respectively provided with four sets of second threaded holes. The multiple sets of second screws (22) pass through the second through holes and are threadedly connected to the second threaded holes.

5. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 4, characterized in that, It also includes a first handle ring (23), a second handle ring (24) and a third handle ring (25), the top of the first fixing ring (11) is connected to the first handle ring (23), the top of the second fixing ring (12) is connected to the second handle ring (24), and the top of the third fixing ring (13) is connected to the third handle.

6. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 5, characterized in that, The cover plate assembly includes a cover plate (26) and four sets of third screws (27). The top of the cover plate (26) is provided with four sets of mounting through holes, and the top of the housing (1) of the recycling device is provided with four sets of mounting threaded holes. The four sets of third screws (27) are respectively threadedly connected to the mounting threaded holes through the mounting through holes.

7. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 6, characterized in that, The preliminary filtration assembly for demethanized tail gas includes an adsorption filter box (28), a drawer (29), a baffle (30), a two-component screen (31), and a fourth handle (32). The left end of the outer shell (1) of the recovery device is connected to the adsorbent filter box. A through-hole is provided at the left end of the outer shell (1), which is connected to the adsorbent filter box. An air inlet pipe is provided at the left end of the adsorbent filter box, and a solenoid valve (10) is provided on the air inlet pipe. A drawer (29) opening is provided at the front end of the adsorbent filter box. The drawer (29) opening and the drawer (29) slide together. The front end of the drawer (29) is connected to the baffle (30). The front end of the baffle (30) is provided with four sets of third through holes. The front end of the adsorbent filter box is provided with four sets of first threaded holes. Four sets of fifth screws (33) pass through the third through holes and are threadedly connected to the first threaded holes. The top of the drawer (29) is provided with two sets of ventilation slots. The front end and rear end of the two sets of ventilation slots are respectively provided with locking slides. Two sets of screens (31) are respectively slidably locked with the two sets of locking slides. Activated carbon (34) is provided in the drawer (29). The front end of the baffle (30) is connected to the fourth handle (32).

8. The multi-layer filter adsorption type demethanizing tail gas recovery device as described in claim 7, characterized in that, The four sets of mounting through holes, the four sets of three through holes, the four sets of first through holes, and the multiple sets of second through holes are all set as countersunk holes.

Images