Low-concentration gas enrichment and membrane repair self-circulation device

Abstract

The application discloses a low-concentration gas enrichment and membrane repair self-circulation device, which comprises a kettle body, a guide channel and a turnover mechanism; the kettle body is internally divided into an enrichment area and a repair area; a membrane adsorption separation module is arranged in the enrichment area, and the membrane adsorption separation module comprises an adsorption membrane; a membrane self-repair module is arranged in the repair area, and the membrane self-repair module comprises a cleaning material; the guide channel is used for guiding the decomposition products of the cleaning material to enter the adsorption membrane in the enrichment area; a valve for controlling opening and closing is installed on the pipeline of the guide channel; a solar energy driving module is inlaid on the outer wall of the bottom of the kettle body and is used for providing heat energy for the cleaning material; and the turnover mechanism can drive the kettle body to overturn and stand upside down. The low-concentration gas is efficiently treated and the self-repair function of the membrane is realized by utilizing heat energy to drive the cleaning material to automatically clean the impurities on the surface of the membrane, so that the service life of the membrane is prolonged, the artificial maintenance cost is reduced, the service life of the membrane is prolonged, and the device is environment-friendly and safe.

Description

Technical Field

[0001] This invention relates to the field of low-concentration gas enrichment and separation technology, and in particular to a low-concentration gas enrichment and membrane repair self-circulation device. Background Technology

[0002] With the continuous advancement of industrialization, the treatment of low-concentration methane has gradually attracted widespread attention. Especially in fields such as coal mining, natural gas, and oil extraction, the emission of low-concentration methane not only wastes resources but also poses potential threats to the environment and human health. Therefore, how to efficiently and continuously recover and utilize this low-concentration methane has become a pressing technical challenge that needs to be overcome.

[0003] Traditional technologies for treating low-concentration methane gas mainly include adsorption, membrane separation, and catalysis. Among these, membrane separation technology has gained widespread application due to its advantages such as low energy consumption, simple operation, and no secondary pollution. However, existing membrane separation devices often face problems such as membrane efficiency degradation and reduced treatment efficiency due to impurity deposition and contamination during long-term use. This is especially true when treating low-concentration methane gas, as its complex composition makes the membrane surface highly susceptible to blockage by harmful substances and contaminants, thus affecting the membrane's lifespan. To overcome this problem, researchers have proposed various membrane repair technologies, hoping to extend the membrane's lifespan through external cleaning, chemical repair, and other methods. However, these methods often require additional energy and manual intervention and cannot effectively address the problem of incomplete repair caused by contaminant accumulation during membrane use.

[0004] Therefore, there is an urgent need for a new type of membrane separation device to address the shortcomings of existing technologies, such as the susceptibility of membrane materials to fouling, which leads to decreased efficiency and reduced treatment capacity, as well as the need for additional energy and manual intervention, and the incomplete repair of existing membrane repair technologies. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a low-concentration gas enrichment and membrane repair self-circulation device. By combining the design of an adsorption membrane and a self-cleaning repair membrane, thermal energy is used to drive the repair material to automatically clean impurities on the membrane surface, thereby achieving efficient treatment of low-concentration gas and the self-repair function of the membrane, extending the service life of the membrane, and reducing manual maintenance costs.

[0006] To achieve the above objectives, the present invention provides a self-circulating device for low-concentration gas enrichment and membrane repair, comprising a pot body, a guide channel, and a flipping mechanism.

[0007] The kettle body has a spout at the top, and the interior of the kettle body is divided into an upper enrichment zone and a lower repair zone; the enrichment zone is equipped with a membrane adsorption separation module, which includes an adsorption membrane for adsorbing low concentrations of methane; the repair zone is equipped with a membrane self-repair module, which includes cleaning materials.

[0008] The guide channel is located outside the vessel body, with one end of its pipe connected to the repair zone and the other end connected to the enrichment zone, used to guide the decomposition products of the cleaning material into the adsorption membrane of the enrichment zone; a valve for controlling opening and closing is installed on the pipe of the guide channel; the guide channel valve is a gravity-driven one-way valve.

[0009] A solar drive module is embedded in the outer wall of the bottom of the kettle body, which is used to provide heat energy for the cleaning material.

[0010] The flipping mechanism includes a bracket and a flipping motor mounted on the bracket. The output shaft of the flipping motor is connected to the side wall of the kettle body, which can drive the kettle body to flip and stand upside down.

[0011] Furthermore, the adsorption membrane uses polyethersulfone as the polymer matrix, and modified activated carbon and NU-1000 are added to the matrix as fillers.

[0012] Furthermore, the method for preparing the adsorption membrane includes:

[0013] S1: Add polyvinylpyrrolidone and polyethersulfone to dimethyl sulfoxide at a mass ratio of 1:10-1:20; stir at 40-100℃ for 5-10 hours to completely dissolve the two to obtain a PES solution;

[0014] S2: Add modified activated carbon to dimethyl sulfoxide at a ratio of 1-10 wt%, and treat with ultrasound for 30-180 minutes to disperse the modified activated carbon particles evenly, to obtain an activated carbon solution; add NU-1000 to dimethyl sulfoxide at a ratio of 10-30 wt%, and treat with ultrasound for 30-180 minutes to disperse the NU-1000 particles evenly, to obtain a NU-1000 solution;

[0015] S3: Add the solution of activated carbon and NU-1000 dispersed in step S2 to the PES solution obtained in step S1, stir at 50-100℃ for 1-3 hours, and then place it in an ultrasonic bath for 30-180 minutes to avoid packing agglomeration, so that the activated carbon and NU-1000 are evenly distributed in the solution.

[0016] S4: Finally, pour the mixed solution obtained in step S3 into the membrane container and dry it at 60-80℃ for 8-12 hours to form an adsorption membrane. After cutting, install it in the enrichment zone.

[0017] Furthermore, the cleaning material is a compound granular product of ZIF-8 material, polylactic acid and polyvinyl alcohol. The compound granular product can decompose to produce ZnO under the action of heat energy, so as to clean impurities on the surface of the adsorption membrane.

[0018] Furthermore, the method for preparing the cleaning material includes:

[0019] S1: Add polyvinyl alcohol and polylactic acid to a mixed solution of ethanol and water at a mass ratio of 1:1-4:1, wherein the ratio of ethanol to water is 7:3-9:1; stir at 60-100℃ to dissolve the two.

[0020] S2: Add ZIF-8 material to the solution obtained in step S1. The amount of ZIF-8 material added is 10%-50% of the total mass of polyvinyl alcohol and polylactic acid. Stir for 10-20 minutes to make ZIF-8 evenly distributed.

[0021] S1: After evaporating the solvent obtained in step S2, the solvent is dried and ground to form particles with a particle size of 100-500μm.

[0022] Furthermore, the solar-driven module is located on the bottom shell of the pot. When the membrane adsorption separation module needs to be cleaned, the pot is rotated 160-180°. The solar-driven module accumulates heat energy, which causes the cleaning material in the repair area to decompose. The decomposition products enter the area where the adsorption membrane is located through the guide channel to achieve the self-repair of the membrane.

[0023] Furthermore, it also includes a methane outlet, which is connected to the enrichment zone and is used to discharge the methane that has been separated and enriched by the adsorption membrane. A membrane flux detector is installed at the methane outlet.

[0024] The beneficial effects of this invention are:

[0025] 1. The membrane adsorption separation module of the present invention adopts a mixed matrix design of polyethersulfone matrix, modified activated carbon, and NU-1000 metal-organic framework: the high specific surface area of ​​modified activated carbon increases the gas adsorption sites, and the regular pore structure of NU-1000 enhances the selectivity for methane. The two work together to improve the separation efficiency of low-concentration gas, which can effectively enrich methane from low-concentration gas, reduce resource waste, and provide practical technical support for gas recovery in coal mines, oil and gas extraction and other fields.

[0026] 2. In this invention, the ZIF-8 / PLA / PVA composite particles in the repair zone decompose to produce ZnO active components under the thermal energy provided by the solar-driven module. These ZnO active components enter the membrane layer through the guide channel, oxidizing and decomposing pollutants such as oil and dust. The membrane flux detector at the methane outlet monitors the membrane performance in real time. When the flux drops to a set range, the flipping mechanism is automatically activated, and the gravity-driven one-way valve opens synchronously. No manual judgment or operation is required, solving the problem of traditional membrane repair requiring additional energy and manual maintenance.

[0027] 3. The device of this invention achieves autonomous cycle of gas treatment and membrane maintenance through a closed-loop logic of "enrichment-contamination-remediation-re-enrichment": when the membrane is contaminated, it automatically starts the repair process and automatically resets to the enrichment state after the repair is completed, without the need for frequent shutdowns to replace membrane materials; the solar-driven module uses clean energy as the main energy source, and the gravity-driven one-way valve design further reduces energy consumption and operating costs, making it suitable for long-term outdoor operation scenarios.

[0028] 4. This invention integrates core components such as enrichment zone, repair zone, and guide channel into the vessel body, making it compact and highly sealed, and adaptable to complex industrial environments. The collaborative design of mechanical components such as the flipping mechanism and gravity valve with the membrane system and solar module ensures both gas separation efficiency during enrichment and precise delivery of cleaning materials during repair, resulting in high overall structural stability and low failure rate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram illustrating the internal structure of the kettle body in an embodiment of the present invention.

[0031] In the diagram: 1. Pot body; 11. Pot spout; 12. Enrichment zone; 13. Repair zone; 14. Membrane adsorption separation module; 15. Membrane self-repair module; 16. Guide channel; 17. Methane outlet; 2. Solar drive module; 3. Tilting mechanism; 31. Support; 32. Tilting motor. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0033] This invention discloses a self-circulating device for low-concentration gas enrichment and membrane repair.

[0034] Reference Figure 1 and Figure 2A low-concentration gas enrichment and membrane repair self-circulation device is designed based on the "inverted kettle" principle. It is mainly used for the enrichment of low-concentration gas and the self-repair of membrane fouling. It includes a kettle body 1, a solar drive module 2, a guide channel 16 and a flipping mechanism 3.

[0035] The top of the kettle body 1 has a spout 11 for low-concentration gas to enter, and the interior is divided into an upper enrichment zone 12 and a lower repair zone 13.

[0036] The enrichment zone 12 has a built-in membrane adsorption separation module 14, the core of which is a highly selective adsorption membrane used to adsorb methane in low-concentration gas and separate impurities such as nitrogen and carbon dioxide. The enrichment zone 12 has a methane outlet 17 on its side, which is connected to the outside and used to discharge the enriched methane. A membrane flux detector is installed at the methane outlet 17.

[0037] Repair zone 13 is located in the lower layer of the vessel body 1 and contains cleaning material for self-repair after membrane fouling.

[0038] The solar-powered module 2 is embedded in the bottom shell of the pot body 1. It can absorb solar energy and convert it into heat energy to provide the energy required for the decomposition of the cleaning material in the repair area 13.

[0039] The guide channel 16 is located outside the vessel body 1. One end of its pipeline connects to the repair zone 13, and the other end connects to the membrane adsorption separation module 14 of the enrichment zone 12. A valve is installed on the pipeline of the guide channel 16 to control its opening and closing. The guide channel 16 is used to guide the decomposition products of the cleaning material into the adsorption membrane area. The valve of the guide channel 16 can be a manual valve or a gravity-driven one-way valve, preferably a gravity-driven one-way valve. When the device is in the enrichment upright state, the valve core adheres to the sealing surface under its own gravity, closing the channel and ensuring that the gas in the enrichment zone 12 is separated only through the membrane system and does not connect with the repair zone 13. During the inverted repair stage, the valve core is subjected to the reverse force of gravity, detaches from the sealing surface, and the channel opens. The decomposition products of the cleaning material can enter the membrane layer under the influence of gravity and airflow to complete the cleaning. No additional power is required, realizing a self-circulation of enrichment and repair.

[0040] The flipping mechanism 3 includes a bracket 31 and a flipping motor 32 mounted on the bracket 31. The output end of the flipping motor 32 is connected to the side wall of the kettle body 1, thereby driving the kettle body 1 to tilt and flip.

[0041] When the membrane flux detector detects a drop in membrane flux to a set value, the flipping mechanism 3 tilts and flips the vessel 1, activating the membrane repair function. The solar-driven module 2 flips upwards, absorbing solar energy and converting it into heat to decompose the cleaning material. The valve in the guide channel 16 automatically opens, and the decomposition products enter the adsorption membrane in the enrichment zone 12 for membrane repair. Once the membrane flux returns to the set value, the flipping mechanism 3 flips the vessel 1 back to an upright enrichment state. The cooperation of these structures enables a self-circulating process of gas enrichment, membrane fouling, self-repair, and re-enrichment, requiring no continuous manual intervention.

[0042] The core of the membrane adsorption separation module 14 is the adsorption membrane. The adsorption membrane uses polyethersulfone (PES) as the matrix and adds modified activated carbon and NU-1000 (metal-organic framework, MOF) as fillers. The specific preparation steps are as follows:

[0043] S1: Weigh polyvinylpyrrolidone (PVP) and polyethersulfone (PES) at a mass ratio of 1:10-1:20, and add them to a sufficient amount of dimethyl sulfoxide (DMF, solvent); place the mixed solution in a constant temperature environment of 40-100℃, and stir continuously with a magnetic stirrer for 5-10 hours until PVP and PES are completely dissolved to form a uniform and transparent PES solution; let it stand for 1-2 hours to remove air bubbles, and set aside for later use.

[0044] S2: Modified activated carbon dispersion: Weigh the modified activated carbon at a ratio of 1-10 wt% (relative to the mass of DMF) and add it to DMF; use an ultrasonic treatment device to sonicate for 30-180 minutes to fully disperse the activated carbon particles without obvious agglomeration, and obtain an activated carbon dispersion;

[0045] NU-1000 dispersion: Weigh NU-1000 at a ratio of 10-30 wt% (relative to the mass of DMF) and add it to DMF; treat with ultrasound for 30-180 minutes to ensure uniform dispersion of NU-1000 particles, and obtain NU-1000 dispersion.

[0046] S3: Add the above activated carbon dispersion and NU-1000 dispersion to the PES matrix solution in sequence, and stir at 50-100℃ for 1-3 hours at a stirring rate of 300-500 r / min to initially mix the packing material with the matrix; then place the mixed solution in an ultrasonic bath and sonicate for 30-180 minutes to completely break up the packing material agglomerates and ensure that the activated carbon and NU-1000 are uniformly distributed in the solution; finally, pour the mixed solution into a membrane container and dry it at 60-80℃ for 8-12 hours to form an adsorption membrane, which is then cut and installed in the membrane adsorption separation module 14 of the enrichment zone 12.

[0047] The PES matrix in the adsorption membrane provides mechanical strength, the high specific surface area of ​​the modified activated carbon increases the gas adsorption sites, and the regular pore structure of NU-1000 enhances the selective adsorption of methane. The three work synergistically to improve the enrichment efficiency of low-concentration gas.

[0048] The cleaning material is a composite particulate product of ZIF-8 material, polylactic acid (PLA), and polyvinyl alcohol (PVA). Under thermal energy, it can decompose to produce ZnO, which is used to clean impurities on the membrane surface. The specific preparation steps are as follows:

[0049] S1: Weigh PLA and PVA at a mass ratio of 1:1-4:1 and add them to a mixed solvent of ethanol and water, with a volume ratio of ethanol to water of 7:3-9:1. Place the mixed solution in a water bath at 60-100℃ and stir for 30-60 minutes at a stirring speed of 200-300 r / min until PLA and PVA are completely dissolved to form a homogeneous polymer solution.

[0050] S2: Weigh 10%-50% of the total mass of PLA and PVA ZIF-8 material (metal-organic framework, which can decompose to produce ZnO) and add it to the above polymer solution; continue stirring for 10-20 minutes to make ZIF-8 uniformly dispersed in the solution to form a mixed slurry.

[0051] S3: Place the mixed slurry in a rotary evaporator and evaporate the solvent under reduced pressure at 60-100℃ to obtain a solid block product; place the block product in a vacuum drying oven (60-80℃) and dry for 4-6 hours to remove residual solvent; then grind it with a grinder and screen it through a 100-500 mesh sieve to obtain compound particles with a size of 100-500μm, which are then loaded into the repair zone 13 for later use.

[0052] PLA and PVA in the cleaning material provide structural support for the particles. ZnO produced by the decomposition of ZIF-8 under thermal energy has strong oxidizing properties, which can oxidize and decompose impurities such as oil and dust on the membrane surface, thus achieving self-cleaning of the membrane.

[0053] Example 1:

[0054] Adsorption membrane preparation: Weigh 50g PES and 5g PVP, add to 500mL DMF, stir at 50℃ for 6 hours until completely dissolved, and let stand to remove bubbles; weigh 5g activated carbon (1wt% relative to DMF) and add to 500mL DMF, sonicate for 60 minutes; weigh 5g NU-1000 (10wt% relative to DMF) and add to 50mL DMF, sonicate for 60 minutes; add the activated carbon and NU-1000 solution to the PES solution, stir at 50℃ for 2 hours, and then sonicate for 60 minutes; pour the mixed solution into the membrane container, dry to form a membrane, and install it in enrichment zone 12.

[0055] Preparation of cleaning materials: Weigh 9g PLA and 3g PVA, add them to a mixed solvent of ethanol:water = 7:3, and stir to dissolve at 60℃; add 2.4g ZIF-8 (accounting for 20% of the total mass of PLA and PVA), stir to dissolve thoroughly at 60℃ for 20 minutes, evaporate the solvent, dry and grind to 300μm particles, and pack into repair zone 13.

[0056] Test results: When a mixture of 10% methane and 90% nitrogen was introduced, the selectivity of the device for CH4 / N2 reached 5.0 at room temperature and 1 bar. In simulated membrane fouling, i.e. after the adsorption membrane was soaked in oil stains, the device was inverted and started to repair it. After 6 hours, the residual oil on the membrane surface was reduced to 30%, and the membrane flux was restored to 80% of the initial value.

[0057] Example 2:

[0058] Adsorption membrane preparation: Weigh 50g PES and 5g PVP, add to 500mL DMF, and stir at 80℃ for 8 hours until completely dissolved; weigh 10g activated carbon (2wt% relative to DMF) and add to 500mL DMF, and sonicate for 80 minutes; weigh 8g NU-1000 (16wt% relative to DMF) and add to 50mL DMF, and sonicate for 120 minutes; after mixing, stir at 80℃ for 1 hour and sonicate for 120 minutes; after drying to form a membrane, install it in enrichment zone 12.

[0059] Preparation of cleaning materials: Weigh 12g PLA and 3g PVA (mass ratio 4:1), add them to a mixed solvent of ethanol:water = 9:1, and stir to dissolve at 80℃; add 4.5g ZIF-8 (accounting for 30% of the total mass of PLA and PVA), stir for 20 minutes, evaporate the solvent, dry and grind to 200μm particles, and fill the repair zone 13.

[0060] Test results: When a mixture of 10% methane and 90% nitrogen was introduced, the selectivity of the device for CH4 / N2 reached 8.01 at room temperature and 1 bar. After simulating membrane fouling, the membrane flux recovered to 92% of the initial value after 6 hours of repair, demonstrating a significant cleaning effect.

[0061] The working principle of the low-concentration gas enrichment and membrane repair self-circulation device of the present invention is as follows: low-concentration gas, such as containing 10%-30% methane and the remainder being nitrogen, carbon dioxide, etc., enters the enrichment zone 12 through the spout 11. In the membrane adsorption separation module 14, the adsorption membrane selectively adsorbs methane molecules, while impurities such as nitrogen and carbon dioxide are intercepted and discharged with the tail gas; the adsorbed methane is discharged from the methane outlet 17 under the pressure difference, thus completing the enrichment.

[0062] After the device has been running for a period of time, when the membrane flux detector detects that the membrane flux has dropped to the set value, such as when the membrane flux drops to 70% of the initial value, it is determined to be membrane fouling. The signal is transmitted to the flipping mechanism 3, which tilts and flips the pot body 1 by 160-180°, so that the repair zone 13 is above the enrichment zone 12. The gravity-driven one-way valve of the guide channel 16 is automatically opened. The solar drive module 2 absorbs solar energy and converts it into heat energy or supplements it through an external auxiliary heat source, so that the temperature of the repair zone 13 rises to 80-150°C. The cleaning materials are decomposed by heat: PLA and PVA matrix break down, and ZIF-8 decomposes to produce ZnO active particles. The ZnO particles enter the enrichment zone 12 through the guide channel 16 and react with pollutants on the membrane surface, such as oil and carbon particles, to decompose them into harmless small molecules such as CO2 and H2O, which are discharged with the airflow.

[0063] When the membrane flux detector detects that the membrane flux has recovered to the set value, such as 85% or more, the flipping mechanism 3 resets the pot body 1, the valve of the guide channel 16 is automatically closed, and the device re-enters the gas enrichment process. The above-mentioned "enrichment-pollution-remediation-re-enrichment" process can be automatically triggered or manually controlled according to the changes in membrane flux, forming a self-circulation and significantly reducing the frequency of manual maintenance.

[0064] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-concentration gas enrichment and membrane repair self-circulation device, characterized in that: It includes a kettle body (1), a guide channel (16), and a flipping mechanism (3); The kettle body (1) has a spout (11) at the top. The kettle body (1) is divided into an upper enrichment zone (12) and a lower repair zone (13). The enrichment zone (12) is equipped with a membrane adsorption separation module (14), which includes an adsorption membrane for adsorbing low-concentration gas. The repair zone (13) is equipped with a membrane self-repair module (15), which includes cleaning materials. The guide channel (16) is located outside the pot body (1). One end of its pipeline is connected to the repair area (13), and the other end is connected to the enrichment area (12). It is used to guide the decomposition products of the cleaning material into the adsorption membrane of the enrichment area (12). A valve for controlling opening and closing is installed on the pipeline of the guide channel (16). The valve of the guide channel (16) is a gravity-driven one-way valve. The bottom outer wall of the kettle body (1) is inlaid with a solar drive module (2), which is used to provide heat energy for the cleaning material; The flipping mechanism (3) includes a bracket (31) and a flipping motor (32) mounted on the bracket (31). The output shaft of the flipping motor (32) is connected to the side wall of the pot body (1) and can drive the pot body (1) to flip and stand upside down. The cleaning material is a compound granular product of ZIF-8 material, polylactic acid and polyvinyl alcohol. The compound granular product can decompose to produce ZnO under the action of heat energy, so as to clean the impurities on the surface of the adsorption membrane. The method for preparing the cleaning material includes: S1: Add polyvinyl alcohol and polylactic acid to a mixed solution of ethanol and water at a mass ratio of 1:1-4:1, wherein the ratio of ethanol to water is 7:3-9:1; stir at 60-100℃; S2: Add ZIF-8 material to the solution obtained in step S1. The amount of ZIF-8 material added is 10%-50% of the total mass of polyvinyl alcohol and polylactic acid. Stir for 10-20 minutes to make ZIF-8 evenly distributed. S3: After evaporating the solvent obtained in step S2, the solvent is dried and ground to form particles with a particle size of 100-500μm. The solar drive module (2) is located on the bottom shell of the pot body (1). When the membrane adsorption separation module (14) needs to be cleaned, the pot body (1) is rotated 160-180°. The solar drive module (2) accumulates heat energy to cause the cleaning material in the repair area (13) to decompose. The decomposition products enter the area where the adsorption membrane is located through the guide channel (16) to achieve the self-repair of the membrane.

2. The low-concentration gas enrichment and membrane repair self-circulation device according to claim 1, characterized in that: The adsorption membrane uses polyethersulfone as the polymer matrix, and modified activated carbon and NU-1000 are added to the matrix as fillers.

3. The low-concentration gas enrichment and membrane repair self-circulation device according to claim 2, characterized in that: The method for preparing the adsorption membrane includes: S1: Add polyvinylpyrrolidone and polyethersulfone to dimethyl sulfoxide at a mass ratio of 1:10-1:20; stir at 40-100℃ for 5-10 hours to completely dissolve the two to obtain a PES solution; S2: Add modified activated carbon to dimethyl sulfoxide at a ratio of 1-10 wt%, and treat with ultrasound for 30-180 minutes to disperse the modified activated carbon particles evenly, to obtain an activated carbon solution; add NU-1000 to dimethyl sulfoxide at a ratio of 10-30 wt%, and treat with ultrasound for 30-180 minutes to disperse the NU-1000 particles evenly, to obtain a NU-1000 solution; S3: Add the solution of activated carbon and NU-1000 dispersed in step S2 to the PES solution obtained in step S1, stir at 50-100℃ for 1-3 hours, and then place it in an ultrasonic bath for 30-180 minutes to avoid packing agglomeration, so that the activated carbon and NU-1000 are evenly distributed in the solution. S4: Finally, pour the mixed solution obtained in step S3 into the membrane device and dry it at 60-80℃ for 8-12 hours to form an adsorption membrane. After cutting, install it in the enrichment area (12).

4. The low-concentration gas enrichment and membrane repair self-circulation device according to claim 1, characterized in that: It also includes a methane outlet (17), which is connected to the enrichment zone (12) and is used to discharge the methane separated and enriched by the adsorption membrane. A membrane flux detector is installed at the methane outlet (17).

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