CN-120682854-B - Self-circulation device for low-concentration gas enrichment and membrane repair

CN120682854BCN 120682854 BCN120682854 BCN 120682854BCN-120682854-B

Abstract

The invention discloses a low-concentration gas enrichment and membrane repair self-circulation device which comprises a kettle body, a guide channel and a turnover mechanism, wherein an enrichment area and a repair area are divided into the kettle body, a membrane adsorption separation module is arranged in the enrichment area and comprises an adsorption membrane, a membrane self-repair module is arranged in the repair area and comprises cleaning materials, the guide channel is used for guiding decomposition products of the cleaning materials to enter the adsorption membrane of the enrichment area, a valve for controlling opening and closing is arranged on a pipeline of the guide channel, a solar driving module is embedded on the outer wall of the bottom of the kettle body and used for providing heat energy for the cleaning materials, and the turnover mechanism can drive the kettle body to turn upside down. According to the invention, the cleaning material is driven by heat energy to automatically clean impurities on the surface of the membrane, so that the high-efficiency treatment of low-concentration gas and the self-repairing function of the membrane are realized, the service life of the membrane is prolonged, the manual maintenance cost is reduced, the service life of the membrane is prolonged, and the membrane has the advantages of environmental protection and safety.

Inventors

QI XUYAO
XU DEXIN
CHEN MUJUN
QIN YAQI
SHEN ZHICHAO
LIU YONG
LI QUANGUI
QI GUANSHENG

Assignees

中国矿业大学

Dates

Publication Date: 20260512
Application Date: 20250809

Claims (4)

1. The self-circulation device for enriching low-concentration gas and repairing a membrane is characterized by comprising a kettle body (1), a guide channel (16) and a turnover mechanism (3); A kettle opening (11) is formed in the top of the kettle body (1), an enrichment area (12) of an upper layer and a restoration area (13) of a lower layer are divided in the kettle body (1), a membrane adsorption separation module (14) is arranged in the enrichment area (12), the membrane adsorption separation module (14) comprises an adsorption membrane for adsorbing low-concentration gas, a membrane self-restoration module (15) is arranged in the restoration area (13), and the membrane self-restoration module (15) comprises a cleaning material; The guide channel (16) is positioned outside the kettle body (1), one end of the pipeline of the guide channel is communicated with the repair area (13), and the other end of the pipeline of the guide channel is communicated with the enrichment area (12) and is used for guiding decomposition products of the cleaning material to enter an adsorption film of the enrichment area (12); the valve of the guide channel (16) is a gravity-driven one-way valve; The solar energy driving module (2) is embedded in the outer wall of the bottom of the kettle body (1), and the solar energy driving module (2) is used for providing heat energy for cleaning materials; The turnover mechanism (3) comprises a bracket (31) and a turnover motor (32) arranged on the bracket (31), and an output shaft of the turnover motor (32) is connected with the side wall of the kettle body (1) to drive the kettle body (1) to turn upside down; The cleaning material adopts a ZIF-8 material, a compound particle product of polylactic acid and polyvinyl alcohol, and the compound particle product can be decomposed to generate ZnO under the action of heat energy so as to clean impurities on the surface of the adsorption film; The preparation method of the cleaning material comprises the following steps: S1, adding polyvinyl alcohol and polylactic acid into a mixed solution of ethanol and water according to a mass ratio of 1:1-4:1, wherein the ratio of the ethanol to the water is 7:3-9:1, and stirring at 60-100 ℃; s2, adding ZIF-8 material into the solution obtained in the step S1, wherein the adding amount of the ZIF-8 material is 10-50% of the total mass of the polyvinyl alcohol and the polylactic acid, and stirring for 10-20 minutes to uniformly distribute the ZIF-8; s3, evaporating the solvent obtained in the step S2, and drying and grinding to form particles with the size of 100-500 mu m; The solar driving module (2) is arranged on the bottom shell of the kettle body (1), when the membrane adsorption separation module (14) needs to be cleaned, the kettle body (1) is turned 160-180 degrees, and heat energy is accumulated by the solar driving module (2), so that cleaning materials in the repairing area (13) are decomposed, and decomposition products enter the area where the adsorption membrane is located through the guide channel (16) to realize self-repairing of the membrane.
2. The low-concentration gas enrichment and membrane repair self-circulation device according to claim 1, wherein the adsorption membrane adopts polyether sulfone as a polymer matrix, and modified activated carbon and NU-1000 are added into the matrix as fillers.
3. The self-circulation device for enriching and repairing low-concentration gas according to claim 2, wherein the preparation method of the adsorption membrane comprises the following steps: S1, adding polyvinylpyrrolidone and polyethersulfone into dimethyl sulfoxide according to a mass ratio of 1:10-1:20, and stirring for 5-10 hours at 40-100 ℃ to completely dissolve the polyvinylpyrrolidone and the polyethersulfone to obtain PES solution; s2, adding modified activated carbon into dimethyl sulfoxide according to the proportion of 1-10wt%, and carrying out ultrasonic treatment for 30-180 minutes to uniformly disperse modified activated carbon particles to obtain an activated carbon solution, adding NU-1000 into the dimethyl sulfoxide according to the proportion of 10-30wt%, and carrying out ultrasonic treatment for 30-180 minutes to uniformly disperse NU-1000 particles to obtain a NU-1000 solution; S3, adding the dispersed activated carbon obtained in the step S2 and NU-1000 solution into the PES solution obtained in the step S1, stirring for 1-3 hours at 50-100 ℃, and then placing the mixture into an ultrasonic bath for ultrasonic treatment for 30-180 minutes to avoid filler agglomeration, so that the activated carbon and NU-1000 are uniformly distributed in the solution; S4, finally, pouring the mixed solution obtained in the step S3 into a membrane tool, drying for 8-12 hours at 60-80 ℃ to form an adsorption membrane, and mounting the adsorption membrane in an enrichment area (12) after cutting.
4. The self-circulation device for enriching and repairing low-concentration gas and membrane according to claim 1, further comprising a methane outlet (17), wherein the methane outlet (17) is communicated with the enrichment zone (12) and is used for discharging methane enriched by adsorption membrane separation, and a membrane flux detector is arranged at the methane outlet (17).

Description

Self-circulation device for low-concentration gas enrichment and membrane repair Technical Field The invention relates to the technical field of low-concentration gas enrichment and separation, in particular to a low-concentration gas enrichment and membrane repair self-circulation device. Background With the continuous advancement of industrialization, the problem of treating low-concentration gas has gradually attracted widespread attention. Particularly in the fields of coal mine, natural gas, petroleum exploitation and the like, the emission of low-concentration gas not only causes the waste of resources, but also can form potential threat to the environment and human health. Therefore, how to efficiently and continuously recycle and utilize these low-concentration gases becomes a technical problem to be overcome currently. The traditional low-concentration gas treatment technology mainly comprises an adsorption method, a membrane separation method, a catalytic method and the like. The membrane separation technology has wide application by virtue of the advantages of low energy consumption, simple and convenient operation, no secondary pollution and the like. However, the existing membrane separation device generally faces the problems of membrane efficiency attenuation, treatment efficiency reduction and the like caused by deposition and pollution of impurities in long-term use of membrane materials. Particularly, when treating low-concentration gas, the membrane surface is easily blocked by harmful substances and pollutants due to complex components, thereby influencing the service life of the membrane. To overcome this problem, researchers have proposed various membrane repair techniques, and it is desirable to extend the service life of the membrane by means of external cleaning, chemical repair, and the like. However, these methods often require additional energy and human intervention, and cannot effectively solve the problem of incomplete repair of the membrane due to accumulation of contaminants during use. Therefore, a new membrane separation device is needed to solve the problems of the prior art that the membrane material is easily polluted, resulting in reduced efficiency and reduced treatment efficiency, and the prior membrane repair technology needs additional energy and manual intervention, and is not completely repaired. Disclosure of Invention In order to solve the technical problems, the invention provides a low-concentration gas enrichment and membrane repair self-circulation device, which is characterized in that by combining the design of an adsorption membrane and a self-cleaning repair membrane, a heat energy driving repair material is utilized to automatically clean impurities on the surface of the membrane, so that the high-efficiency treatment of low-concentration gas and the self-repair function of the membrane are realized, the service life of the membrane is prolonged, and the manual maintenance cost is reduced. In order to achieve the aim, the invention provides 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 comprises a kettle body, a kettle mouth, a membrane adsorption separation module, a membrane self-repairing module and a cleaning material, wherein the top of the kettle body is provided with the kettle mouth, and the interior of the kettle body is divided into an enrichment area of an upper layer and a repairing area of a lower layer; The guide channel is positioned outside the kettle body, one end of the pipeline of the guide channel is communicated with the repair area, and the other end of the pipeline of the guide channel is communicated with the enrichment area and is used for guiding decomposition products of the cleaning material to enter an adsorption film of the enrichment area; the pipeline of the guide channel is provided with a valve for controlling opening and closing, and the guide channel valve is a gravity-driven one-way valve; the solar driving module is embedded on the outer wall of the bottom of the kettle body and is used for providing heat energy for cleaning materials; the turnover mechanism comprises a bracket and a turnover motor arranged on the bracket, wherein an output shaft of the turnover motor is connected with the side wall of the kettle body, and can drive the kettle body to turn upside down. Further, the adsorption film adopts polyether sulfone as a polymer matrix, and modified activated carbon and NU-1000 are added into the matrix as fillers. Further, the preparation method of the adsorption film comprises the following steps: S1, adding polyvinylpyrrolidone and polyethersulfone into dimethyl sulfoxide according to a mass ratio of 1:10-1:20, and stirring for 5-10 hours at 40-100 ℃ to completely dissolve the polyvinylpyrrolidone and the polyethersulfone to obtain PES solution; s2, adding modified activated carbon into dim