A device for adsorption and recovery of volatile organic compounds in petrochemical tail gas

Abstract

This utility model relates to the recovery of volatile organic compounds (VOCs) in petrochemical processes, and discloses an adsorption and recovery device for VOCs in petrochemical tail gas. The device includes multiple adsorption towers, with inlet pipes fixedly connected between them. A connecting pipe is fixedly connected to one side of each inlet pipe, and a conveying fan is fixedly connected to one end of the connecting pipe. A cooling filter assembly is fixedly connected to the input end of the conveying fan. Each adsorption tower has a tower cover at its top, and a quick-fastening assembly is installed inside each tower and tower cover. Each assembly includes a fastening rod, an inner sleeve, a fastening steel ball, and an outer sleeve. The outer wall of the fastening rod passes through the inside of the tower cover, and the inner wall of the inner sleeve is slidably connected to the outer wall of the fastening rod. This utility model, through its quick-fastening structure, achieves rapid replacement of the adsorbent during equipment use, solving the problem of cumbersome bolt tightening and replacement, and improving the efficiency of the adsorption and recovery device.

Description

Technical Field

[0001] This utility model relates to the recovery of volatile organic compounds in petrochemicals, and more particularly to an adsorption and recovery device for volatile organic compounds in petrochemical tail gas. Background Technology

[0002] Volatile organic compound (VOC) adsorption and recovery devices utilize adsorption materials such as activated carbon and molecular sieves to capture and enrich VOCs generated during petrochemical production, and then recover and reuse them through desorption. These devices are widely used in the petrochemical industry. They balance environmental, economic, and safety benefits, making them an indispensable environmental protection equipment for petrochemical enterprises.

[0003] The core principle of a volatile organic compound (VOC) adsorption and recovery device is to utilize the selective adsorption capacity of adsorbent materials to achieve separation and recovery of VOCs. First, waste gas containing VOCs enters the adsorption unit. Through the porous structure of materials such as activated carbon and molecular sieves, the VOCs are adsorbed and retained, and the purified gas meets emission standards. Then, when the adsorbent material approaches saturation, a desorption process is initiated. Through heating, depressurization, or the introduction of inert gas, the VOCs are released from the material, forming a high-concentration VOC gas. Finally, the high-concentration VOCs are condensed and liquefied or separated by membrane separation, converting them into liquid solvents or fuels for recycling. The entire process operates through alternating adsorption and desorption, continuously treating waste gas and recovering useful substances, thus balancing environmental protection and resource utilization.

[0004] Current adsorption recovery devices suffer from significant design shortcomings in terms of rapid disassembly of the adsorption towers. The tower body itself is mostly a monolithic welded structure or uses segmented flange rigid connections. Simply removing the bolts between tower segments requires individual operation, with disassembly of a single connection often exceeding one hour. The method of fixing the internal adsorption components to the tower wall also limits disassembly efficiency. The grid plates are secured to the tower body by welding or multiple sets of bolts, requiring layer-by-layer removal when replacing the adsorption material. Furthermore, the tower diameter is often 1-3 meters, and the heavy structure makes hoisting and relocation difficult, further extending the disassembly cycle. In scenarios with frequent maintenance, this design not only increases downtime losses but also raises the risk of volatile organic compound (VOC) residue leakage due to the lengthy disassembly process, becoming a prominent pain point in equipment operation and maintenance. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides an adsorption and recovery device for volatile organic compounds in petrochemical exhaust gas, which aims to improve the cumbersome bolt tightening and replacement problem and enhance the efficiency of the adsorption and recovery device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a device for adsorbing and recovering volatile organic compounds in petrochemical tail gas, comprising multiple adsorption towers, with an inlet pipe fixedly connected between the adsorption towers, a connecting pipe II fixedly connected to one side of the inlet pipe, a conveying fan fixedly connected to one end of the connecting pipe II, and a cooling filter assembly fixedly connected to the input end of the conveying fan; each adsorption tower is provided with a tower cover at its top, and a quick-fastening assembly is installed inside each adsorption tower and tower cover;

[0007] Each of the aforementioned quick-fastening components includes a fastening rod, an inner sleeve, a fastening ball, and an outer sleeve. The outer wall of the fastening rod passes through the inside of the tower cover. The inner wall of the inner sleeve is slidably connected to the outer wall of the fastening rod. The outer wall of the fastening ball is disposed inside the inner sleeve. Each inner sleeve has an inner conical sleeve slidably connected to its outer wall. The inner wall of the outer sleeve is fixedly connected to the outer wall of the inner conical sleeve. A spring is disposed inside the outer sleeve. One end of the spring is fixedly connected to the inner wall of the outer sleeve, and the other end of the spring is fixedly connected to the outer wall of the inner sleeve.

[0008] As a further description of the above technical solution:

[0009] The cooling and filtering assembly includes a cooler and a filter. The input end of the cooler is fixedly connected to a connecting pipe, one end of the connecting pipe is fixedly connected to a filter, and one side of the filter is fixedly connected to an exhaust gas inlet pipe.

[0010] As a further description of the above technical solution:

[0011] Each of the tower covers is equipped with an exhaust pipe at its top, and an exhaust valve is fixedly connected inside each exhaust pipe.

[0012] As a further description of the above technical solution:

[0013] Each of the exhaust pipes is fixedly connected to a rain cover at its top, and the exhaust pipes are arranged in a symmetrical array on the top of the tower cover.

[0014] As a further description of the above technical solution:

[0015] Each of the tower covers is fixedly connected to a desorption gas pipe at its top, and each of the desorption gas pipes is fixedly connected to a recovery valve inside.

[0016] As a further description of the above technical solution:

[0017] A condenser is fixedly connected inside the desorption gas pipe, a separator is fixedly connected inside the desorption gas pipe, and a liquid storage tank is fixedly connected to the bottom end of the desorption gas pipe.

[0018] As a further description of the above technical solution:

[0019] The adsorption tower is equipped with a honeycomb adsorbent, and a hot air pipe is fixedly connected to one side of each adsorption tower. A hot air generator is fixedly connected to one end of the hot air pipe.

[0020] As a further description of the above technical solution:

[0021] The desorption gas pipes are arranged in a symmetrical array on the top of the tower cover, and the recovery valves are also arranged in a symmetrical array on the top of the tower cover.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, when the adsorbent needs to be replaced after long-term use, simply hold the outer sleeve, pull out the inner sleeve, and then the steel ball will pop out, thus unlocking the device. Through the quick fastening structure, the adsorbent can be replaced quickly during the use of the equipment, solving the problem of cumbersome bolt fastening and replacement, and improving the efficiency of the adsorption and recovery device.

[0024] 2. In this utility model, when the exhaust gas enters the adsorption tower from the pipeline, the exhaust gas will pass through the honeycomb adsorbent to complete deep adsorption. Through the honeycomb adsorbent, the adsorption efficiency is improved during the use of the equipment, which solves the problem of uneven adsorption of conventional adsorbents and improves the economy of the adsorption and recovery device. Attached Figure Description

[0025] Figure 1 This is a perspective view of a device for adsorbing and recovering volatile organic compounds in petrochemical tail gas according to the present invention.

[0026] Figure 2 This is a schematic diagram of the rapid fastening structure of a petrochemical tail gas adsorption and recovery device proposed in this utility model.

[0027] Figure 3 for Figure 2 A magnified view of the structure at point A in the middle;

[0028] Figure 4 This is a schematic diagram of the adsorption structure of an adsorption and recovery device for volatile organic compounds in petrochemical tail gas proposed in this utility model.

[0029] Figure 5 for Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0030] Legend:

[0031] 1. Adsorption tower; 2. Filter; 3. Connecting pipe one; 4. Cooler; 5. Conveying fan; 6. Connecting pipe two; 7. Inlet pipe; 8. Exhaust pipe; 9. Tower cover; 10. Exhaust pipe; 11. Exhaust valve; 12. Rain cover; 13. Desorbed gas pipe; 14. Condenser; 15. Separator; 16. Liquid storage tank; 17. Hot air pipe; 18. Hot air generator; 19. Fastening rod; 20. Inner sleeve; 21. Fastening steel ball; 22. Inner conical sleeve; 23. Outer sleeve; 24. Spring; 25. Recovery valve; 26. Honeycomb adsorbent. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1-3 This utility model provides an embodiment of an adsorption and recovery device for volatile organic compounds in petrochemical tail gas, comprising multiple adsorption towers 1 for holding adsorbents, an inlet pipe 7 fixedly connected between the adsorption towers 1 for conveying waste gas in conjunction with a connecting pipe 6, a connecting pipe 6 fixedly connected to one side of the inlet pipe 7, a conveying fan 5 fixedly connected to one end of the connecting pipe 6 for conveying waste gas, a cooling filter assembly fixedly connected to the input end of the conveying fan 5 for filtering and cooling the waste gas; each adsorption tower 1 is provided with a tower cover 9 at the top for sealing the tower body, and each adsorption tower 1 and tower cover 9 are provided with a quick fastening assembly for quick disassembly of the tower cover 9;

[0034] Each quick-fastening assembly includes a fastening rod 19, an inner sleeve 20, a fastening ball 21, and an outer sleeve 23. The outer wall of the fastening rod 19 passes through the inside of the tower cover 9 to fasten the tower cover 9 to the tower body. The inner wall of the inner sleeve 20 is slidably connected to the outer wall of the fastening rod 19 to cooperate with the inner conical sleeve 22 to achieve a fastening effect. The outer wall of the fastening ball 21 is located inside the inner sleeve 20 to provide compression friction. The outer wall of each inner sleeve 20 is slidably connected to the inner conical sleeve 22. The inner wall of the outer sleeve 23 is fixedly connected to the outer wall of the inner conical sleeve 22 for gripping. A spring 24 is provided inside the outer sleeve 23 to connect the inner sleeve 20 and the outer sleeve 23. One end of the spring 24 is fixedly connected to the inner wall of the outer sleeve 23, and the other end of the spring 24 is fixedly connected to the outer wall of the inner sleeve 20.

[0035] Reference Figure 2 and Figure 4-5The cooling and filtration assembly includes a cooler 4 and a filter 2 for filtering cooling exhaust gas. A connecting pipe 3 is fixedly connected to the input end of the cooler 4, and the filter 2 is fixedly connected to one end of the connecting pipe 3. An exhaust gas inlet pipe 8 is fixedly connected to one side of the filter 2. Each tower cover 9 has an exhaust pipe 10 at its top for discharging purified exhaust gas. An exhaust valve 11 is fixedly connected inside each exhaust pipe 10 for controlling the exhaust. A rain cover 12 is fixedly connected to the top of each exhaust pipe 10 for rain protection. The exhaust pipes 10 are arranged in a symmetrical array on the top of the tower cover 9. A desorption gas pipe 13 is fixedly connected to the top of each tower cover 9 for transporting desorbed organic matter. A recovery valve 25 is fixedly connected inside each desorption gas pipe 13 for controlling the desorption gas pipe 13. A condenser 14 is fixedly connected inside the desorption gas pipe 13 for condensing organic matter. A separator 15 is also fixedly connected inside the desorption gas pipe 13 for separating liquid organic matter. A storage tank 16 is fixedly connected to the bottom end of the desorption gas pipe 13 for storing the recovered organic matter. A honeycomb adsorbent 26 is installed inside the adsorption tower 1 for adsorbing tail gas. A hot air pipe 17 is fixedly connected to one side of each adsorption tower 1 for supplying hot air. A hot air generator 18 is fixedly connected to one end of the hot air pipe 17 for generating hot air. The desorption gas pipes 13 are arranged in a symmetrical array on the top of the tower cover 9, and the recovery valves 25 are also arranged in a symmetrical array on the top of the tower cover 9.

[0036] Working principle: The exhaust gas is first introduced into the device through the exhaust gas inlet pipe 8. Under the action of the conveying fan 5, it is initially filtered by the filter 2 to remove large particulate impurities. Then, the exhaust gas enters the cooler 4 through the connecting pipe 1 3. By reducing the gas temperature, the cooled exhaust gas is transported to the adsorption tower 1 through the connecting pipe 2 6 and the inlet pipe 7. Then, the exhaust gas enters the honeycomb adsorbent 26 area set in the tower. After adsorption is completed, the clean exhaust gas is finally discharged through the exhaust pipe 10. The top of the tower is equipped with a tower cover 9, a rain cover 12, and an exhaust valve 11. Once the adsorbent reaches saturation, hot air is generated by the hot air generator 18 and introduced into the adsorption tower 1 via the hot air pipe 17 to heat and desorb the adsorbent. The desorbed high-temperature organic gas enters the condenser 14 through the desorption gas pipe 13, where it is rapidly cooled and liquefied into liquid organic matter. It then enters the separator 15 for gas-liquid separation and is finally recovered into the storage tank 16. The desorption gas pipe 13 is equipped with a recovery valve 25 to control the desorption gas pipe 13. When the adsorbent needs to be replaced, simply hold the outer sleeve 23 and pull out the inner sleeve 20 to disengage the inner conical sleeve 22 from the outer sleeve 23. At this time, the fastening steel ball 21, which is provided with elasticity by the spring 24, will automatically pop out to complete the unlocking operation. Then, pull out the fastening rod 19 to remove the tower cover 9.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for adsorbing and recovering volatile organic compounds from petrochemical tail gas, comprising multiple adsorption towers (1), characterized in that: An air inlet pipe (7) is fixedly connected between the adsorption towers (1). A connecting pipe (6) is fixedly connected to one side of the air inlet pipe (7). A conveying fan (5) is fixedly connected to one end of the connecting pipe (6). A cooling filter assembly is fixedly connected to the input end of the conveying fan (5). A tower cover (9) is provided on the top of each adsorption tower (1). A quick fastening assembly is installed inside each adsorption tower (1) and tower cover (9). Each of the aforementioned quick-fastening components includes a fastening rod (19), an inner sleeve (20), a fastening ball (21), and an outer sleeve (23). The outer wall of the fastening rod (19) passes through the inside of the tower cover (9). The inner wall of the inner sleeve (20) is slidably connected to the outer wall of the fastening rod (19). The outer wall of the fastening ball (21) is located inside the inner sleeve (20). The outer wall of the inner sleeve (20) is slidably connected to an inner conical sleeve (22). The inner wall of the outer sleeve (23) is fixedly connected to the outer wall of the inner conical sleeve (22). The outer sleeve (23) is provided with a spring (24). One end of the spring (24) is fixedly connected to the inner wall of the outer sleeve (23), and the other end of the spring (24) is fixedly connected to the outer wall of the inner sleeve (20).

2. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 1, characterized in that: The cooling and filtering assembly includes a cooler (4) and a filter (2). The input end of the cooler (4) is fixedly connected to a connecting pipe (3), one end of the connecting pipe (3) is fixedly connected to the filter (2), and one side of the filter (2) is fixedly connected to an exhaust gas inlet pipe (8).

3. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 1, characterized in that: Each of the tower covers (9) is provided with an exhaust pipe (10) at the top, and an exhaust valve (11) is fixedly connected inside each exhaust pipe (10).

4. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 3, characterized in that: Each of the exhaust pipes (10) is fixedly connected to a rain cover (12) at its top end, and the exhaust pipes (10) are arranged in a symmetrical array on the top of the tower cover (9).

5. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 1, characterized in that: Each of the tower covers (9) is fixedly connected to a desorption gas pipe (13) at the top, and each of the desorption gas pipes (13) is fixedly connected to a recovery valve (25).

6. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 5, characterized in that: A condenser (14) is fixedly connected inside the desorption gas pipe (13), a separator (15) is fixedly connected inside the desorption gas pipe (13), and a liquid storage tank (16) is fixedly connected to the bottom end of the desorption gas pipe (13).

7. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 5, characterized in that: The adsorption tower (1) is provided with a honeycomb adsorbent (26) inside. Each adsorption tower (1) is fixedly connected to one side with a hot air pipe (17), and a hot air generator (18) is fixedly connected to one end of the hot air pipe (17).

8. The adsorption and recovery device for volatile organic compounds in petrochemical tail gas according to claim 5, characterized in that: The desorption gas pipes (13) are arranged in a symmetrical array on the top of the tower cover (9), and the recovery valves (25) are arranged in a symmetrical array on the top of the tower cover (9).

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