A natural gas semi-biological purification device

Abstract

The utility model relates to natural gas purification field, and disclose a kind of natural gas semi-biological purification device, including purification tower, still including the air inlet pipe of setting in the one side of the purification tower, the baffle of setting in the purification tower, baffle is connected in the purification tower and side and the inner wall of the purification tower fixed connection, biological desulfurization structure is set in the purification tower, the transition hole being opened in the baffle, the materialization decarburization structure of setting in the purification tower, the air outlet pipe two of setting in the one side of the purification tower away from air inlet pipe, air outlet pipe two is installed with exhaust fan in the end away from purification tower, by integrating biological desulfurization and materialization decarburization function in same tower body structure, effectively shorten gas transmission path, reduce the pressure loss of gas transmission between different processing units, reduce power equipment energy consumption, while compact integrated design reduces floor area.

Description

Technical Field

[0001] This utility model relates to the field of natural gas purification, specifically a semi-biological natural gas purification device. Background Technology

[0002] Driven by the transformation of energy structure and the "dual carbon" goal, the demand for natural gas as a clean and low-carbon energy source continues to grow. Natural gas (especially unconventional natural gas such as shale gas and biogas) often contains impurities such as hydrogen sulfide (H2S), carbon dioxide (CO2), and moisture during the extraction or preparation process. Among them, H2S is toxic and corrosive, and CO2 will reduce the calorific value of natural gas. They need to be removed through purification to meet the standards for industrial applications or pipeline transportation.

[0003] Current semi-biological purification processes suffer from problems such as dispersed equipment, low integration, and large footprint. Biological desulfurization units (such as trickling filters) and physicochemical decarbonization units (such as membrane separation devices and amine absorption towers) are mostly independent devices connected in series via pipelines. This design leads to pressure loss during gas transmission between units, increasing compressor energy consumption. At the same time, the dispersed equipment layout is particularly unsuitable for small and medium-sized gas fields or biogas projects with limited space. In addition, complex pipeline connections increase the risk of leakage and raise maintenance costs. To address these issues, we propose a semi-biological natural gas purification device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a semi-biological natural gas purification device, which solves the aforementioned problems.

[0005] To achieve the aforementioned objectives, this utility model provides the following technical solution: a semi-biological natural gas purification device, comprising a purification tower, and further comprising: An air inlet pipe is provided on one side of the purification tower, and the air inlet pipe is connected to the outer cylindrical surface of the purification tower. The air inlet pipe is close to the bottom of the purification tower. A partition is installed inside the purification tower. The partition is snapped into the purification tower and its side is fixedly connected to the inner wall of the purification tower. The partition divides the purification tower into two parts, and the air inlet pipe is on one side of the partition. The biological desulfurization structure is installed inside the purification tower, between the partition and the air inlet pipe; A transition hole is formed on the partition plate, the transition hole connects the two sides of the partition plate, and the transition hole is close to the top of the purification tower; The physicochemical decarbonization structure is installed in the purification tower, and the physicochemical decarbonization structure is located on the side of the partition away from the biological desulfurization structure. The second outlet pipe is located on the side of the purification tower away from the inlet pipe. The second outlet pipe is connected to the outer cylindrical surface of the purification tower. The second outlet pipe is close to the bottom of the purification tower and corresponds to the physicochemical decarbonization structure. A suction fan is installed at the end of the second outlet pipe away from the purification tower.

[0006] Preferably, the biological desulfurization structure includes filter plates and biochar. Multiple filter plates are fixedly connected inside the purification tower and are distributed at equal intervals. The filter plates are on the side of the partition corresponding to the air inlet pipe. One of the filter plates near the bottom of the purification tower is above the air inlet pipe. The side of the filter plates away from the bottom of the purification tower is filled with biochar, and a biofilm formed by sulfur-oxidizing bacteria is attached to the surface of the biochar.

[0007] Preferably, the biological desulfurization structure further includes a water tank, a spray nozzle, and an inlet pipe. The water tank is a semi-circular ring structure with a hollow interior. The water tank is snapped into the purification tower. The water tank is located on the side of the partition corresponding to the air inlet pipe. The water tank is close to the opening end of the purification tower and is located between the biochar and the transition hole. Multiple evenly distributed spray nozzles are installed on the inner ring surface of the water tank. The inlet pipe is connected through the outer ring surface of the water tank. The other end of the inlet pipe passes through the purification tower on the outside of the purification tower.

[0008] Preferably, the outer cylindrical surface of the purification tower has multiple square openings that are equidistantly distributed vertically. The number and distribution of the square openings correspond to the filter plate and are located above the filter plate. Each square opening is fitted with an arc-shaped cover plate.

[0009] Preferably, the arc-shaped cover plate has oxygen holes through it on one side outside the purification tower, and each oxygen hole is fitted with a sealing plug.

[0010] Preferably, a discharge pipe is connected through the outer cylindrical surface of the purification tower, and the discharge pipe is close to the bottom surface of the purification tower and below the air inlet pipe.

[0011] Preferably, the physicochemical decarbonization structure includes a support plate and a fiber composite membrane. Multiple uniformly distributed fiber composite membranes are connected through the two support plates. The fiber composite membranes are cylindrical structures. The two support plates are snapped into the purification tower and are tightly fitted to the inner wall of the purification tower. The support plate is on the side of the partition corresponding to the gas outlet pipe. The support plate near the opening of the purification tower is below the transition hole.

[0012] Preferably, an outlet pipe is connected through the outer cylindrical surface of the purification tower, and the outlet pipe corresponds to the fiber composite membrane between the two support plates.

[0013] Preferably, the physicochemical decarbonization structure further includes a second hopper, a guide pipe, and a first hopper. The second hopper is a hollow structure with one end semi-circular and the other end circular. The second hopper is snapped into the purification tower. The second hopper is located on the side of the partition corresponding to the second gas outlet pipe. The end of the second hopper, which is between the bottom surface of the purification tower and the support plate and has a semi-circular opening, is attached to the support plate. The end of the second hopper away from the support plate is fixedly connected to the guide pipe. The other end of the guide pipe is fixedly connected to the first hopper. The end of the first hopper with the larger aperture is attached to the bottom surface of the purification tower. Multiple circumferentially evenly distributed through holes are opened through the conical surface of the first hopper.

[0014] Preferably, the physicochemical decarbonization structure further includes a second water tank, a second spray nozzle, and a second liquid inlet pipe. The second water tank is a semi-circular annular structure with a hollow interior. The second water tank is snapped into the purification tower. The second water tank is located on the side of the partition corresponding to the second gas outlet pipe. The second water tank is located between the second hopper and the first hopper and is close to the second hopper. Multiple evenly distributed second spray nozzles are installed on the side of the second water tank opposite to the first hopper. The second liquid inlet pipe is connected through the outer ring surface of the second water tank. The other end of the second liquid inlet pipe passes through the purification tower on the outside of the purification tower. The second liquid inlet pipe is above the second gas outlet pipe.

[0015] Compared with the prior art, this utility model provides a semi-biological purification device for natural gas, which has the following beneficial effects: This semi-biological natural gas purification unit integrates biological desulfurization and physicochemical decarbonization functions into the same tower structure, effectively shortening the gas transmission path, reducing pressure loss during gas transmission between different processing units, and lowering the energy consumption of power equipment. At the same time, the compact integrated design reduces the footprint, mitigating the impact of site limitations on application scenarios. Simplified pipeline connections reduce the risk of leakage and lower equipment maintenance costs, achieving efficient, stable, and economical operation of the natural gas purification process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a cross-sectional schematic diagram of the biological desulfurization structure and the physicochemical decarbonization structure of this utility model.

[0017] In the diagram: 1. Purification tower; 2. Discharge pipe; 3. Inlet pipe; 4. Arc-shaped cover plate; 5. Liquid inlet pipe 1; 6. Baffle plate; 7. Gas outlet pipe 1; 8. Liquid inlet pipe 2; 9. Gas outlet pipe 2; 10. Biochar; 11. Water tank 1; 12. Spray nozzle 1; 13. Water tank 2; 14. Spray nozzle 2; 15. Hopper 1; 16. Guide pipe; 17. Support plate; 18. Fiber composite membrane; 19. Filter plate; 20. Square opening; 21. Transition hole; 22. Through hole; 23. Oxygen hole; 24. Hopper 2. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-3 A semi-biological natural gas purification device includes a purification tower 1, and further includes: An inlet pipe 3 is provided on one side of the purification tower 1. The inlet pipe 3 is connected to the outer cylindrical surface of the purification tower 1 and is close to the bottom of the purification tower 1. The partition 6 is installed inside the purification tower 1. The partition 6 is snapped into the purification tower 1 and its side is fixedly connected to the inner wall of the purification tower 1. The partition 6 divides the purification tower 1 into two parts, and the air inlet pipe 3 is on one side of the partition 6. The biological desulfurization structure is installed inside the purification tower 1, and the biological desulfurization structure is located between the partition 6 and the air inlet pipe 3. A transition hole 21 is formed on the partition plate 6, the transition hole 21 connects the two sides of the partition plate 6, and the transition hole 21 is close to the top of the purification tower 1. The physicochemical decarbonization structure is installed in the purification tower 1, and the physicochemical decarbonization structure is on the side of the partition 6 away from the biological desulfurization structure. The second outlet pipe 9 is located on the side of the purification tower 1 away from the inlet pipe 3. The second outlet pipe 9 is connected to the outer cylindrical surface of the purification tower 1. The second outlet pipe 9 is close to the bottom of the purification tower 1 and corresponds to the physicochemical decarbonization structure. A suction fan is installed at the end of the second outlet pipe 9 away from the purification tower 1.

[0020] Furthermore, the biological desulfurization structure includes filter plates 19 and biochar 10. Multiple filter plates 19 are fixedly connected inside the purification tower 1 and are distributed at equal intervals. The filter plates 19 are on the side of the partition 6 corresponding to the air inlet pipe 3. One of the filter plates 19 near the bottom of the purification tower 1 is above the air inlet pipe 3. The side of the filter plates 19 facing away from the bottom of the purification tower 1 is filled with biochar 10. The surface of the biochar 10 is covered with a biofilm formed by sulfur-oxidizing bacteria. The filter plates 19 are used to place the biochar 10, and the biochar 10 is used to attach the biofilm formed by sulfur-oxidizing bacteria.

[0021] Furthermore, the biological desulfurization structure also includes a water tank 11, spray nozzles 12, and an inlet pipe 5. The water tank 11 is a semi-circular ring structure with a hollow interior. The water tank 11 is snapped into the purification tower 1. The water tank 11 is on the side of the partition 6 corresponding to the air inlet pipe 3. The water tank 11 is close to the opening end of the purification tower 1 and is between the biochar 10 and the transition hole 21. Multiple evenly distributed spray nozzles 12 are installed on the inner ring surface of the water tank 11. The inlet pipe 5 is connected through the outer ring surface of the water tank 11. The other end of the inlet pipe 5 passes through the purification tower 1 on the outside of the purification tower 1. The water tank 11 stores a nutrient solution containing nitrogen source, phosphorus source, and trace elements. The spray nozzles 12 are used to spray out the nutrient solution. The inlet pipe 5 is used to add the nutrient solution. Natural gas is introduced into the air inlet pipe 3. After being treated by the biofilm and the nutrient solution, it enters the other side of the purification tower 1 through the transition hole 21.

[0022] Furthermore, multiple square openings 20 are equidistantly distributed on the outer cylindrical surface of the purification tower 1. The number and distribution of the square openings 20 correspond to the filter plate 19 and are located above the filter plate 19. Each square opening 20 is fitted with an arc-shaped cover plate 4. The square openings 20 are used to place biochar 10, and the arc-shaped cover plates 4 are used to seal the square openings 20.

[0023] Furthermore, each of the arc-shaped cover plates 4 has an oxygen hole 23 through it on the outer side of the purification tower 1. Each oxygen hole 23 is fitted with a sealing plug. The oxygen hole 23 is used to introduce oxygen into the purification tower 1.

[0024] Furthermore, a discharge pipe 2 is connected through the outer cylindrical surface of the purification tower 1. The discharge pipe 2 is close to the bottom surface of the purification tower 1 and below the air inlet pipe 3. The nutrient solution sprayed by the spray nozzle 12 passes through the biochar 10 and the filter plate 19 to the bottom of the purification tower 1 and is discharged from the discharge pipe 2.

[0025] Furthermore, the physicochemical decarbonization structure includes a support plate 17 and a fiber composite membrane 18. Multiple uniformly distributed fiber composite membranes 18 are connected through the two support plates 17. The fiber composite membrane 18 has a cylindrical structure. The two support plates 17 are snapped into the purification tower 1 and are tightly fitted to the inner wall of the purification tower 1. The support plate 17 is on the side of the partition 6 corresponding to the gas outlet pipe 9. The support plate 17 near the opening of the purification tower 1 is below the transition hole 21. The support plate 17 is used to connect the fiber composite membrane 18, and the fiber composite membrane 18 is used to diffuse carbon dioxide.

[0026] Furthermore, an outlet pipe 7 is connected through the outer cylindrical surface of the purification tower 1. The outlet pipe 7 corresponds to the fiber composite membrane 18 between the two support plates 17. The outlet pipe 7 is used to discharge the gas with high carbon dioxide content that seeps out of the fiber composite membrane 18 for further treatment or direct discharge.

[0027] Furthermore, the physicochemical decarbonization structure also includes hopper two 24, guide pipe 16, and hopper one 15. Hopper two 24 is a hollow structure with one end semi-circular and the other end circular. Hopper two 24 is snapped into the purification tower 1. Hopper two 24 is located on the side of the partition 6 corresponding to the gas outlet pipe two 9. The end of hopper two 24, which is between the bottom surface of the purification tower 1 and the support plate 17 and has a semi-circular opening, is attached to the support plate 17. The end of hopper two 24 facing away from the support plate 17 is fixedly connected to a guide pipe. The other end of the guide tube 16 is fixedly connected to the hopper 15. The end of the hopper 15 with the larger diameter is in contact with the bottom surface of the purification tower 1. Multiple circumferentially distributed through holes 22 are opened through the conical surface of the hopper 15. The hopper 24 is used to collect the gas passing through the fiber composite membrane 18. The guide tube 16 is used to guide the gas to the bottom. The hopper 15 is used to connect and support the guide tube 16 and the purification tower 1. The through holes 22 are used to discharge the gas from the hopper 15.

[0028] Furthermore, the physicochemical decarbonization structure also includes a water tank 213, a spray nozzle 214, and an inlet pipe 28. The water tank 213 is a semi-circular annular structure with a hollow interior. The water tank 213 is snapped into the purification tower 1. The water tank 213 is located on the side of the partition 6 corresponding to the gas outlet pipe 29. The water tank 213 is located between and close to the hopper 24 and the hopper 15. Multiple evenly distributed spray nozzles are installed on the side of the water tank 213 opposite to the hopper 15. Spray nozzle 214 and water tank 213 are connected by inlet pipe 28 through the outer ring. The other end of inlet pipe 28 passes through the purification tower 1 on the outside of the purification tower 1. Inlet pipe 28 is above gas outlet pipe 29. Water tank 213 stores amine liquid. Spray nozzle 214 is used to spray out the amine liquid. Inlet pipe 28 is used to add amine liquid. The purified gas is discharged from gas outlet pipe 29. A suction fan is installed outside gas outlet pipe 29 to ensure that the gas flows in the processing sequence.

[0029] Structural Description: Purification Tower 1: It is a cylindrical container structure and is the core of the entire device. It provides a closed reaction space for the semi-biological purification process of natural gas, integrating the biological desulfurization structure and the physicochemical decarbonization structure to achieve continuous treatment of natural gas desulfurization and decarbonization. Discharge pipe 2: It is a tubular structure that runs through the outer cylindrical surface of purification tower 1 and is close to the bottom surface of purification tower 1. It is located below the air inlet pipe 3. After spraying the spray nozzle 12, the solution flows through biochar 10 and filter plate 19 to the nutrient solution discharge device at the bottom of purification tower 1. Inlet pipe 3: It has a tubular structure and is connected to the outer cylindrical surface of purification tower 1. It is located near the bottom of purification tower 1 and on one side of partition 6. It transports the natural gas to be purified to the biological desulfurization area inside purification tower 1. Arc-shaped cover plate 4: It has an arc-shaped structure and is snapped into the square opening 20 to seal the square opening 20 to ensure the internal sealing of the purification tower 1. Its outer surface oxygen hole 23 can introduce oxygen into the purification tower 1 to meet the aerobic metabolism requirements of sulfur oxidizing bacteria. Inlet pipe 5: It is a tubular structure, with one end connected to the outer ring of water tank 11, and the other end extending through purification tower 1 to the outside, adding nutrient solution containing nitrogen source, phosphorus source and trace elements into water tank 11. Partition 6: It is a plate-shaped structure that is snapped into the purification tower 1 and its side is fixedly connected to the inner wall. It divides the interior of the purification tower 1 into two independent areas: biological desulfurization and physicochemical decarbonization, so as to realize the spatial separation and orderly operation of different purification processes. Outlet pipe 7: It has a tubular structure, which is connected to the outer cylindrical surface of the purification tower 1, located between the two support plates 17 and corresponding to the fiber composite membrane 18, to discharge the high-concentration carbon dioxide gas that seeps out of the fiber composite membrane 18. Inlet pipe 28: It is a tubular structure. One end is connected to the outer ring of water tank 213, and the other end passes through the purification tower 1 to the outside and is above the gas outlet pipe 29. Amine liquid is added into water tank 213 to provide absorbent for decarbonization. Gas outlet pipe 2 9: It has a tubular structure and is connected to the outer cylindrical surface of purification tower 1. It is located near the bottom and on the side away from the gas inlet pipe 3, corresponding to the physical and chemical decarbonization structure. A suction fan is installed at the opposite end to discharge the pure natural gas and ensure that the gas flows in sequence. Biochar 10: It has a granular or block structure and is filled on the side of filter plate 19 away from the bottom of purification tower 1. Sulfur-oxidizing bacteria are attached to the surface to form a biofilm. With the help of sulfur-oxidizing bacteria, hydrogen sulfide in natural gas is oxidized into elemental sulfur or sulfate. Water tank 11: It is a semi-circular hollow ring structure, which is snapped into the side of the inner partition 6 and the air inlet pipe 3 in the purification tower 1, close to the opening end and between the biochar 10 and the transition hole 21. It stores nutrient solution to provide liquid source for spraying. Spray nozzle 12: It is a spray head structure, with multiple nozzles evenly installed on the inner ring surface of water tank 11. It sprays the nutrient solution in water tank 11 onto biochar 10 to provide the nutrients needed for the growth of sulfur-oxidizing bacteria. Water tank 213: It is a semi-circular hollow ring structure, which is snapped into the side of the partition 6 and the gas outlet pipe 29 inside the purification tower 1. It is located between hopper 24 and hopper 15 and close to hopper 24, storing amine liquid to provide absorbent for decarbonization. Spray nozzle 2 14: It is a spray head structure, with multiple nozzles evenly installed on the opposite side of water tank 2 13 and hopper 1 15 to spray out the amine liquid in water tank 2 13, so that the amine liquid can fully contact the gas to absorb residual carbon dioxide. Hopper 15: It has a conical structure, with the large-diameter end fitting against the bottom surface of the purification tower 1. The conical surface has multiple uniformly circumferential through holes 22, which connect the support guide pipe 16 and the purification tower 1. Gas is discharged through the through holes 22 to contact the amine liquid. Guide pipe 16: It is a tubular structure, with one end fixedly connected to the end of hopper 24 away from the support plate 17, and the other end fixedly connected to hopper 15, so as to guide the gas collected in hopper 24 to hopper 15 to achieve orderly transmission. Support plate 17: It is a plate structure, with two plates snapped into the purification tower 1 and tightly attached to the inner wall, connecting and supporting the fiber composite membrane 18 to ensure its stable installation in the purification tower 1; Fiber composite membrane 18: It has a cylindrical structure with multiple uniformly connected between two support plates 17. It has selective permeation characteristics, allowing carbon dioxide to permeate and seep out to achieve preliminary separation and removal of carbon dioxide. Filter plate 19: It is a plate structure with multiple plates fixed at equal intervals on the side of the partition 6 and the air inlet pipe 3 inside the purification tower 1. One plate is placed near the bottom above the air inlet pipe 3 to provide support for the biochar 10 so that it can function stably. Square opening 20: It is a square opening structure, with multiple openings corresponding to filter plate 19 and opened on the outer cylindrical surface of purification tower 1 above it, for placing biochar 10 for easy replacement and replenishment; Transition hole 21: It is a porous structure, which is opened on the partition 6 near the top of the purification tower 1, connecting the two sides of the partition 6, so that the desulfurized gas can enter the physicochemical decarbonization zone from the biological desulfurization zone. Through hole 22: It is a small hole structure with multiple circumferences evenly opened on the conical surface of hopper 15 to discharge the gas entering hopper 15, so that the gas diffuses and fully contacts the amine liquid to improve the decarbonization efficiency. Oxygen hole 23: It is a hole-like structure that runs through the outer surface of the arc-shaped cover plate 4 and is sealed inside. It introduces oxygen into the biological desulfurization area of ​​the purification tower 1 to meet the aerobic metabolic needs of sulfur oxidizing bacteria. Hopper 24: It is a hollow structure with one end semi-circular and the other end circular. It is snapped into the side of the partition 6 and the gas outlet pipe 29 inside the purification tower 1. It is between the bottom surface and the support plate 17, and the semi-circular end is attached to the support plate 17. It collects the gas passing through the fiber composite membrane 18 and transports it to the guide pipe 16.

[0030] Working principle: The natural gas to be purified enters the purification tower 1 through the inlet pipe 3. Since the inlet pipe 3 is close to the bottom of the purification tower 1 and located on one side of the baffle 6, the gas first enters the biological desulfurization zone between the baffle 6 and the inlet pipe 3. In this zone, the gas flows upward and passes through multiple filter plates 19 that are equidistantly distributed vertically. The biochar 10 filled on the filter plates 19 has a biofilm formed by sulfur-oxidizing bacteria on its surface. Under aerobic conditions, the sulfur-oxidizing bacteria can oxidize hydrogen sulfide (H2S) in the natural gas into elemental sulfur or... Sulfate is removed, thus completing the desulfurization process. Simultaneously, water tank 11 sprays a nutrient solution containing nitrogen, phosphorus, and trace elements onto biochar 10 through spray nozzles 12, providing the necessary nutrients for the growth and reproduction of sulfur-oxidizing bacteria. The sprayed nutrient solution flows through biochar 10 and filter plate 19 to the bottom of purification tower 1, and is finally discharged through discharge pipe 2. Furthermore, oxygen can be introduced into the biological desulfurization area through oxygen holes 23 on the arc-shaped cover plate 4 to meet the aerobic metabolic needs of the sulfur-oxidizing bacteria. The introduced oxygen mixes thoroughly with the natural gas. The combination creates favorable conditions for the biological desulfurization reaction. After desulfurization, the gas enters the physicochemical decarbonization zone on the other side of the partition 6 through the transition hole 21 at the top of the partition 6. In this zone, the gas first comes into contact with the fiber composite membrane 18 supported by the support plate 17. The fiber composite membrane 18 has a cylindrical structure that can selectively allow carbon dioxide (CO2) to permeate out. The high concentration of CO2 gas that permeates out is discharged through the gas outlet pipe 7 for further treatment or direct discharge. Subsequently, the gas continues to flow downward, is collected by the second hopper 24 and guided by the guide pipe 16, and enters the first hopper 15. It diffuses through the through hole 22 on the conical surface of the first hopper 15. At this time, the second water tank 13 sprays amine liquid through the spray nozzle 14. The amine liquid comes into full contact with the gas, further absorbing the residual CO2 and enhancing the decarbonization effect. The pure natural gas after physicochemical decarbonization is collected at the bottom of the purification tower 1 near the gas outlet pipe 9 under the suction of the vent fan, and is finally discharged through the gas outlet pipe 9 to meet the standards for industrial application or pipeline transportation.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A semi-biological natural gas purification device, comprising a purification tower (1), characterized in that, Also includes: An air inlet pipe (3) is provided on one side of the purification tower (1). The air inlet pipe (3) is connected to the outer cylindrical surface of the purification tower (1). The air inlet pipe (3) is close to the bottom of the purification tower (1). The partition (6) is installed inside the purification tower (1). The partition (6) is snapped into the purification tower (1) and its side is fixedly connected to the inner wall of the purification tower (1). The partition (6) divides the purification tower (1) into two parts. The air inlet pipe (3) is on one side of the partition (6). The biological desulfurization structure is installed in the purification tower (1) between the partition (6) and the air inlet pipe (3); A transition hole (21) is provided on the partition (6), the transition hole (21) connects the two sides of the partition (6), and the transition hole (21) is close to the top of the purification tower (1); The physicochemical decarbonization structure is set in the purification tower (1), and the physicochemical decarbonization structure is on the side of the partition (6) opposite to the biological desulfurization structure; The second outlet pipe (9) is located on the side of the purification tower (1) away from the inlet pipe (3). The second outlet pipe (9) is connected to the outer cylindrical surface of the purification tower (1). The second outlet pipe (9) is close to the bottom of the purification tower (1). The second outlet pipe (9) corresponds to the physical and chemical decarbonization structure. A suction fan is installed at the end of the second outlet pipe (9) away from the purification tower (1).

2. The natural gas semi-biological purification device according to claim 1, characterized in that, The biological desulfurization structure includes filter plates (19) and biochar (10). Multiple filter plates (19) are fixedly connected in the purification tower (1) and are distributed at equal intervals. The filter plates (19) are on the side of the partition (6) corresponding to the air inlet pipe (3). One of the filter plates (19) near the bottom of the purification tower (1) is above the air inlet pipe (3). The side of the filter plates (19) away from the bottom of the purification tower (1) is filled with biochar (10). The surface of the biochar (10) is covered with a biofilm formed by sulfur-oxidizing bacteria.

3. The natural gas semi-biological purification device according to claim 2, characterized in that, The biological desulfurization structure also includes a water tank (11), a spray nozzle (12), and an inlet pipe (5). The water tank (11) is a semi-circular ring structure with a hollow interior. The water tank (11) is snapped into the purification tower (1). The water tank (11) is on the side of the partition (6) corresponding to the air inlet pipe (3). The water tank (11) is close to the opening end of the purification tower (1) and between the biochar (10) and the transition hole (21). Multiple evenly distributed spray nozzles (12) are installed on the inner ring surface of the water tank (11). The inlet pipe (5) is connected through the outer ring surface of the water tank (11). The other end of the inlet pipe (5) passes through the purification tower (1) on the outside of the purification tower (1).

4. A semi-biological natural gas purification device according to claim 2, characterized in that, The purification tower (1) has multiple square openings (20) that are equidistantly distributed on its outer cylindrical surface. The number and distribution of the square openings (20) correspond to the filter plate (19) and are located above the filter plate (19). Each square opening (20) is fitted with an arc-shaped cover plate (4).

5. A semi-biological natural gas purification device according to claim 4, characterized in that, The arc-shaped cover plate (4) has oxygen holes (23) through it on one side outside the purification tower (1), and each oxygen hole (23) is fitted with a sealing plug.

6. A semi-biological natural gas purification device according to claim 1, characterized in that, The purification tower (1) has a discharge pipe (2) that is connected through the outer cylindrical surface. The discharge pipe (2) is close to the bottom surface of the purification tower (1) and below the air inlet pipe (3).

7. A semi-biological natural gas purification device according to claim 1, characterized in that, The physical and chemical decarbonization structure includes a support plate (17) and a fiber composite membrane (18). Multiple uniformly distributed fiber composite membranes (18) are connected between the two support plates (17). The fiber composite membrane (18) is a cylindrical structure. The two support plates (17) are snapped into the purification tower (1) and tightly attached to the inner wall of the purification tower (1). The support plate (17) is on the side of the partition (6) corresponding to the second gas outlet pipe (9). The support plate (17) near the opening of the purification tower (1) is below the transition hole (21).

8. A semi-biological natural gas purification device according to claim 7, characterized in that, The purification tower (1) has an outlet pipe (7) that is connected through the outer cylindrical surface. The outlet pipe (7) is located between the two support plates (17) and corresponds to the fiber composite membrane (18).

9. A semi-biological natural gas purification device according to claim 7, characterized in that, The physical and chemical decarbonization structure also includes hopper two (24), guide pipe (16) and hopper one (15). Hopper two (24) is a hollow structure with one end semi-circular and the other end circular. Hopper two (24) is snapped into the purification tower (1). Hopper two (24) is on the side of the partition plate (6) corresponding to the gas outlet pipe two (9). The end of hopper two (24) with a semi-circular opening between the bottom surface of the purification tower (1) and the support plate (17) is attached to the support plate (17). The end of hopper two (24) away from the support plate (17) is fixedly connected to the guide pipe (16). The other end of the guide pipe (16) is fixedly connected to hopper one (15). The end of hopper one (15) with a larger aperture is attached to the bottom surface of the purification tower (1). Multiple circumferentially distributed through holes (22) are opened through the conical surface of hopper one (15).

10. A semi-biological natural gas purification device according to claim 9, characterized in that, The physical and chemical decarbonization structure also includes a second water tank (13), a second spray nozzle (14), and a second liquid inlet pipe (8). The second water tank (13) is a semi-circular ring structure with a hollow interior. The second water tank (13) is snapped into the purification tower (1). The second water tank (13) is on the side of the partition (6) corresponding to the second gas outlet pipe (9). The second water tank (13) is between the second hopper (24) and the first hopper (15) and close to the second hopper (24). Multiple evenly distributed second spray nozzles (14) are installed on the side of the second water tank (13) opposite to the first hopper (15). The second liquid inlet pipe (8) is connected through the outer ring surface of the second water tank (13). The other end of the second liquid inlet pipe (8) penetrates the purification tower (1) on the outside of the purification tower (1). The second liquid inlet pipe (8) is above the second gas outlet pipe (9).

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