Hydrophobic hollow fiber microporous membrane bundle assembly and method of making a membrane bundle

Abstract

The application relates to a hydrophobic hollow fiber microporous membrane bundle assembly and a manufacturing method of the membrane bundle. The hydrophobic hollow fiber microporous membrane bundle assembly comprises a shell, a microporous flow control unit and a hydrophobic hollow fiber microporous membrane bundle. The microporous flow control unit and the hydrophobic hollow fiber microporous membrane bundle are arranged in the shell, and the hydrophobic hollow fiber microporous membrane bundle is arranged below the microporous flow control unit. The hydrophobic hollow fiber microporous membrane bundle comprises a plurality of vertically arranged membrane filaments, a resin sealing layer arranged at the top of the membrane filaments and a lower sealing part arranged at the lower end of the membrane filaments. The resin sealing layer is arranged between the membrane filaments and the outside of the membrane bundle. The top end opening of the membrane filaments is communicated with the inner cavity of the membrane filaments. The lower sealing part is arranged at the lower end of the membrane filaments, and the lower end of the membrane filaments is closed. A plurality of through holes are distributed on the side wall of the shell and correspond to the membrane filaments. The through holes are communicated with the cavities outside the membrane filaments. The manufacturing process of the hydrophobic vacuum fiber microporous membrane bundle is greatly simplified, the production efficiency is improved, and the mass transfer of the gas in the water body is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of groundwater air injection remediation, in particular to a hydrophobic hollow fiber microporous membrane bundle assembly and a manufacturing method thereof. BACKGROUND

[0002] The hydrophobic hollow fiber microporous membrane bundle assembly is small in size and suitable for efficient mass transfer of saturated dissolved gas in a groundwater air injection remediation well. In the prior art, most hollow fiber membrane assemblies are manually manufactured, which is low in automation degree and poor in structural performance. The uneven arrangement of the end face or internal membrane filaments of the hollow fiber membrane assembly hinders the mass transfer process and reduces the utilization efficiency of the hollow fiber membrane. Secondly, in the prior art, most hollow fiber membrane materials are hydrophilic membrane filaments. If the hydrophilic material is applied to the mass transfer of gas in a groundwater air injection well, the groundwater is prone to form a water curtain on the surface of the fiber membrane, preventing the diffusion of gas to the groundwater environment. Moreover, the existing hollow fiber membrane assembly is usually large in size and not suitable for gas mass transfer in a groundwater air injection well. In addition, the existing hollow fiber membrane element cannot micro-adjust the gas flow rate, and therefore, the existing hollow fiber microporous membrane assembly needs to be improved to be suitable for application in a groundwater air injection remediation well. SUMMARY

[0003] The first application purpose of the present application is to provide a hydrophobic hollow fiber microporous membrane bundle assembly to solve the problems of the prior art, such as manual manufacturing of the hollow fiber membrane bundle, low automation degree, uneven arrangement of the end face or internal membrane filaments, hindering the mass transfer process, and reducing the utilization efficiency of the hollow fiber membrane.

[0004] To achieve the above purpose, the present application is implemented by the following technical scheme: a hydrophobic hollow fiber microporous membrane bundle assembly, comprising a shell, a microporous flow control unit, and a hydrophobic hollow fiber microporous membrane bundle, wherein the shell has a cavity, the microporous flow control unit is arranged in the shell and located at the upper part, and the hydrophobic hollow fiber microporous membrane bundle is arranged in the shell and located below the microporous flow control unit.

[0005] The hydrophobic hollow fiber microporous membrane bundle comprises a plurality of vertically arranged membrane filaments, an upper sealing part arranged at the top of the membrane filaments, and a lower sealing part arranged at the lower end of the membrane filaments. The upper sealing part comprises a resin glue sealing layer, which is arranged between the membrane filaments and outside the membrane bundle. The top end opening of the membrane filaments is located on the upper surface of the resin sealing layer and communicates with the inner cavity of the membrane filaments. The lower sealing part of the membrane filaments is arranged in the lower end opening of the membrane filaments, between the lower ends of the membrane filaments, and outside the membrane bundle. The lower end opening of the membrane filaments is closed.

[0006] The top of the micropore flow control unit is provided with an air inlet for connecting with an air source, and the lower end of the micropore flow control unit is provided with an air outlet, and the gas output by the air outlet enters the membrane filament through the air inlet on the air inlet connecting cover and the top opening of the membrane filament.

[0007] A plurality of through holes are distributed on the side wall of the shell at positions corresponding to the membrane filaments, and the through holes are in communication with the cavities outside the membrane filaments.

[0008] In the above scheme, the shell includes an upper shell, a middle shell and a lower shell, the micropore flow control unit is arranged in the upper shell, the hydrophobic hollow fiber microporous membrane bundle is arranged in the middle shell, the lower end of the upper shell is detachably connected to the upper end of the middle shell, the lower end of the middle shell is detachably connected to the upper end of the lower shell, and the through holes are arranged on the side wall of the middle shell, and the through holes are arranged on the bottom of the lower shell. Through this arrangement, the assembly process of the hydrophobic hollow fiber microporous membrane bundle assembly can be simplified, and the connection between the upper shell and the middle shell and the connection between the middle shell and the lower shell are better sealed and more stable.

[0009] In the above scheme, the top of the micropore flow control unit is provided with an air inlet pipe fixedly connected with the air inlet of the micropore flow control unit, and the micropore flow control unit is provided with a micropore assembly for adjusting the gas flow. The gas entering the air inlet pipe can be adjusted to the required pressure when entering the hydrophobic hollow fiber microporous membrane bundle through the micropore assembly. Through this arrangement, the tube opening of the air inlet pipe can be connected with the air source through the air guide pipe, and the compressed gas enters the micropore flow control unit through the air inlet pipe, and the gas entering the air inlet pipe can be adjusted to the required pressure when entering the hydrophobic hollow fiber microporous membrane bundle after passing through the micropores of the micropore assembly. The micropore flow control unit is an existing flow adjusting device, and its specific structure is not described here.

[0010] In the above scheme, the inner wall of the upper shell is provided with a positioning groove, the outer wall of the micropore flow control unit is provided with a corresponding elastic positioning ring, a crossbeam is further arranged in the upper shell, the crossbeam is arranged at the lower part of the upper shell, the middle part of the crossbeam is provided with an assembly hole, a sealing ring is arranged in the assembly hole, an air outlet is connected to the lower end of the micropore flow control unit, a sealing ring corresponding to the sealing ring in the assembly hole is arranged on the air outlet, the air outlet and the assembly hole of the crossbeam are sealingly connected through the sealing rings, and a limiting edge limiting the air outlet is arranged at the bottom of the assembly hole. The micropore flow control unit is fixed and supported by the positioning groove and the crossbeam, and the lower end of the air outlet of the micropore flow control unit is connected to the middle part of the crossbeam. Because the sealing ring is arranged in the assembly hole and the sealing ring is arranged on the air outlet, when the air outlet and the crossbeam are connected, the air outlet is fixedly connected to the crossbeam, and the sealing ring on the air outlet is inserted below the sealing ring on the crossbeam. Through this arrangement, two sealing rings are used to make the assembly simple and the connection more firm and the air tightness better. The limiting edge arranged at the bottom of the assembly hole can limit the lower end of the air outlet, preventing the micropore flow control unit from moving up and down.

[0011] In the above scheme, the upper sealing part of the bundle of hydrophobic hollow fiber microporous membranes is provided with an air inlet connecting cover, the air inlet connecting cover includes a lower pipe part and a top cover, an air inlet is arranged on the top cover, the outer periphery of the resin sealing part is sealingly and fixedly connected to the inner wall of the lower pipe part of the air inlet connecting cover, and the air inlet connecting cover is sealingly and detachably connected to the upper shell. By arranging the air inlet connecting cover, the compressed gas delivered by the air outlet of the micropore flow control unit can enter the cavity between the air inlet of the air inlet connecting cover and the opening at the top end of the bundle of hydrophobic hollow fiber microporous membranes, the compressed gas is buffered and uniformly pressurized in the cavity, and then the compressed gas uniformly enters each hydrophobic hollow fiber microporous membrane, so that the gas delivery is more uniform.

[0012] In the above scheme, the lower part of the bundle of hydrophobic hollow fiber microporous membranes is provided with a hoop, which is used to tighten the lower part of the bundle of hydrophobic hollow fiber microporous membranes. The hoop can tighten and fix the lower part of the bundle of hydrophobic hollow fiber microporous membranes, which facilitates the sealing of the lower end of the bundle of hydrophobic hollow fiber microporous membranes by resin glue.

[0013] In the above scheme, the middle shell is further provided with a support frame, the support frame comprises a positioning support ring and a plurality of skeletons, the outer side end of the skeleton is fixedly connected to the inner wall of the middle shell, the inner side end of the skeleton is fixedly connected to the positioning support ring, the aperture of the positioning support ring matches the diameter of the lower end of the hydrophobic hollow fiber microporous membrane bundle after being tightened and bunched, the lower end of the hydrophobic hollow fiber microporous membrane bundle passes through the positioning support ring, and the positioning support ring supports the hydrophobic hollow fiber microporous membrane bundle. By arranging the support frame, the hydrophobic hollow fiber microporous membrane bundle can be stably positioned and supported, and the hollow positioning and supporting are beneficial to the settlement of impurities around the hydrophobic hollow fiber microporous membrane bundle in the mass transfer process in the underground water environment. The support frame is arranged at the lower part of the middle shell, supports the hydrophobic hollow fiber microporous membrane bundle, does not need to make a groove in the lower shell to fix the hydrophobic hollow fiber microporous membrane bundle, simplifies the manufacturing process, reduces the use amount of the hollow fiber membrane, and saves the manufacturing cost.

[0014] In the above scheme, the top opening of the upper shell is provided with a metal annular gasket for limiting the microporous flow control unit, the metal annular gasket is a metal annular gasket with an expandable inner diameter, and a hanging rod is arranged at the upper end of the microporous flow control unit and used for connecting a suspension wire. By arranging the metal annular gasket, the microporous flow control unit can be conveniently locked and fixed, and by arranging the hanging rod, the hydrophobic hollow fiber microporous membrane bundle assembly of the application can be connected to a fixing member above the gas injection well through the suspension wire.

[0015] Another object of the application is to provide a preparation method of the hydrophobic hollow fiber microporous membrane bundle of the hydrophobic hollow fiber microporous membrane bundle assembly.

[0016] S1, the upper ends of the required number of hydrophobic hollow fiber microporous membrane bundle filaments are respectively passed through the through holes of the uniform distribution plate, so that the hydrophobic hollow fiber microporous membrane bundle filaments are arranged on the uniform distribution plate at a set interval, and the upper ends of the hydrophobic hollow fiber microporous membrane bundle filaments are higher than the set length of the uniform distribution plate;

[0017] S2, epoxy resin is coated on the hydrophobic hollow fiber microporous membrane bundle filaments above the uniform distribution plate, so that the epoxy resin fills the gaps between the hydrophobic hollow fiber microporous membrane bundle filaments, and the coating position of the epoxy resin extends to the outside of the outermost hydrophobic hollow fiber microporous membrane bundle filament to form an outer edge sealing layer, and a pipe plate is sleeved on the edge of the outer edge sealing layer, and the lower end of the pipe plate is kept at the same horizontal plane as the upper surface of the uniform distribution plate;

[0018] S3, after the epoxy resin is cured, the cured layer with a set thickness is cut off, the closed part of the top end of the membrane filament is cut off, the top end opening of the hydrophobic hollow fiber microporous membrane bundle filament is exposed, and the top end opening is kept in communication with the inside of the membrane filament;

[0019] S4, coating epoxy resin on the outer wall of the tube plate, and sealing and fixedly connecting the gas inlet connecting cover with the tube plate;

[0020] S5, tightly tying the lower end of the hydrophobic hollow fiber microporous membrane bundle, and performing epoxy resin sealing treatment on the lower end of the hydrophobic hollow fiber microporous membrane bundle, after the epoxy resin is cured, the lower end opening of the hydrophobic hollow fiber microporous membrane bundle is closed by the epoxy resin, and the preparation of the hydrophobic hollow fiber microporous membrane bundle is completed.

[0021] In the above scheme, the hoop is used to tightly fix the lower end of the hydrophobic hollow fiber microporous membrane bundle.

[0022] The hydrophobic hollow fiber microporous membrane bundle assembly has the following advantages: 1) the hydrophobic hollow fiber membrane is used, and underground water is not easy to be adsorbed in the membrane hole to form a water curtain, so that the gas mass transfer efficiency is significantly improved; 2) the micro-pore flow control unit is used to adjust the gas flow entering the cavity of the hollow fiber membrane assembly in a small amount, so that the gas pressure entering the hydrophobic hollow fiber membrane is maintained in a stable state, so that the working state is balanced, and the gas mass transfer efficiency and gas utilization rate of the hydrophobic hollow fiber microporous membrane bundle are improved; 3) the preparation process of the hydrophobic vacuum fiber microporous membrane bundle of the hydrophobic hollow fiber microporous membrane bundle assembly does not need to be wound, only the membrane filaments are uniformly arranged on the uniform distribution plate at a certain interval, and the epoxy resin is used for sealing treatment of the end, the preparation process of the hydrophobic vacuum fiber microporous membrane bundle is greatly simplified, the production efficiency is improved, the assembly preparation time is shortened, the production process is reduced, the cost of assembly research and development and production is greatly reduced, and the prepared hydrophobic vacuum fiber microporous membrane bundle has uniform spacing between the membrane filaments, so that the gas mass transfer in the water body is more uniform; 4) the hydrophobic hollow fiber microporous membrane bundle assembly has a compact structure and is convenient to disassemble and assemble, and is more suitable for gas mass transfer in a groundwater injection well. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of the hydrophobic hollow fiber microporous membrane bundle assembly of the present application.

[0024] Figure 2 FIG. 3 is a schematic diagram of the internal structure of the hydrophobic hollow fiber microporous membrane bundle assembly of the present application.

[0025] Figure 3 FIG. 5 is a structural schematic diagram of the hydrophobic hollow fiber microporous membrane bundle.

[0026] Figure 4 FIG. 7 is a partial enlarged schematic diagram of the middle A part. Figure 2

[0027] Figure 5 ​is a partial enlarged view of part B in Figure 2

[0028] Figure 6 is a structural schematic diagram of the microporous flow control unit.

[0029] In the figure, the shell 1, the upper shell 11, the positioning groove 111, the crossbeam 112, the assembly hole 1121, the hydrophobic hollow fiber microporous membrane bundle fixing part 113, the middle shell 12, the positioning support ring 121, the framework 122, the through hole 123, the lower shell 13, the gasket 131, the microporous flow control unit 2, the upper assembly 21, the assembly port 211, the air inlet pipe 212, the lower assembly 22, the air guide pipe 221, the microporous assembly 222, the air outlet pipe 223, the hydrophobic hollow fiber microporous membrane bundle 3, the membrane wire 31, the upper sealing part 32, the resin sealing layer 321, the air inlet connecting cover 322, the lower pipe part 3221, the top cover 3222, the air inlet 32221, the lower sealing part 33, the clamp 34, the O-shaped sealing ring 4, the metal ring gasket 5, the hanger 6. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below through embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As shown in Figures 1-5 , the hydrophobic hollow fiber microporous membrane bundle assembly of the present application comprises a shell 1, a microporous flow control unit 2 and a hydrophobic hollow fiber microporous membrane bundle 3.

[0032] The shell 1 can adopt a high-strength metal shell or a non-metal shell. The shell 1 can adopt an integrated shell or a split shell. In the embodiment shown in the drawings of the present application, a split metal shell is selected. The shell 1 comprises an upper shell 11, a middle shell 12 and a lower shell 13. The upper shell 11, the middle shell 12 and the lower shell 13 can all adopt a cylindrical tubular structure. The microporous flow control unit 2 is arranged in the upper shell 11, the hydrophobic hollow fiber microporous membrane bundle 3 is arranged in the middle shell 12, the lower end of the upper shell 11 is sealingly and detachably connected to the upper end of the middle shell 12, and the lower end of the middle shell 12 is sealingly and detachably connected to the upper end of the lower shell 13. A through hole 123 is arranged on the sidewall of the middle shell 12 for diffusion of the gas-liquid mixture after mass transfer into groundwater.

[0033] ​The sealing detachable connection method described above can adopt an O-shaped sealing ring 4 fitting connection method. The upper shell 11 and the middle shell 12 are connected by insertion, and O-shaped sealing rings 4 are fixed at the insertion positions. When the upper shell 11 is inserted into the middle shell 12, the O-shaped sealing ring 4 on the upper shell 11 is fitted below the O-shaped sealing ring 4 on the middle shell 12. The two O-shaped sealing rings 4 prevent the connection from loosening, and the two O-shaped sealing rings 4 ensure the air tightness of the connection. The connection between the middle shell 12 and the lower shell 13 is the same as the connection between the upper shell 11 and the middle shell 12. Through this arrangement, the assembly process of the hydrophobic hollow fiber microporous membrane bundle assembly can be simplified, and the connection between the upper shell and the middle shell and the connection between the middle shell and the lower shell are more airtight and stable.

[0034] A positioning groove 111, a cross beam 112, and a hydrophobic hollow fiber microporous membrane bundle fixing part 113 are arranged on the inner wall of the upper shell 11.

[0035] The positioning groove 111 is arranged at the upper position of the upper shell 11, and the cross beam 112 is arranged at the lower position of the upper shell 11. The hydrophobic hollow fiber microporous membrane bundle fixing part 113 is arranged below the cross beam 112.

[0036] The positioning groove 111 is a ring-shaped positioning groove, and an elastic positioning ring corresponding to the positioning groove 111 is arranged on the outer wall of the microporous flow control unit 2. The microporous flow control unit 2 is positioned and fixed by the combination of the elastic positioning ring and the positioning groove 111.

[0037] The middle part of the cross beam 112 is provided with an assembly hole 1121, and a sealing ring is arranged in the assembly hole 1121. An air outlet pipe 223 is connected to the lower end of the microporous flow control unit 2, and a sealing ring corresponding to the sealing ring in the assembly hole 1121 is arranged on the air outlet pipe 223. The air outlet pipe 223 and the assembly hole 1121 on the cross beam 112 are connected by fitting and sealing with the sealing ring.

[0038] The hydrophobic hollow fiber microporous membrane bundle fixing part 113 includes a limiting step surface and an O-shaped sealing ring 4. The O-shaped sealing ring 4 is arranged below the limiting step surface. An O-shaped sealing ring 4 corresponding to the O-shaped sealing ring 4 is arranged on the outer circumferential surface of the upper sealing part 32 of the hydrophobic hollow fiber microporous membrane bundle 3. The O-shaped sealing ring 4 of the upper sealing part 32 of the hydrophobic hollow fiber microporous membrane bundle 3 is inserted above the O-shaped sealing ring 4 on the hydrophobic hollow fiber microporous membrane bundle fixing part 113. The two O-shaped sealing rings 4 fit and fixedly connect the hydrophobic hollow fiber microporous membrane bundle 3 and the upper shell 11. The limiting step surface limits the upper side of the O-shaped sealing ring 4 of the upper sealing part 32 of the hydrophobic hollow fiber microporous membrane bundle 3.

[0039] In the middle shell 12, a support frame is arranged near the lower end opening, which includes a positioning support ring 121 and a plurality of skeletons 122. The positioning support ring 121 is arranged below the skeletons 122. The outer side end of the skeletons 122 is fixedly connected to the inner wall of the middle shell 12, and the inner side end is fixedly connected to the positioning support ring 121. The skeletons 122 are installed at a certain angle downward, and the angle can be set according to needs. The diameter of the positioning support ring 121 matches the diameter of the bundled lower end of the hydrophobic hollow fiber microporous membrane bundle 3. The lower end of the hydrophobic hollow fiber microporous membrane bundle 3 passes through the positioning support ring 121, and the positioning support ring 121 supports the hydrophobic hollow fiber microporous membrane bundle 3.

[0040] A plurality of through holes 123 are arranged on the side wall of the middle shell 12. The diameter and number of the through holes 123 can be set according to needs. The through holes 123 are used for the transmission and diffusion of the gas-liquid mixture after mass transfer into the water body.

[0041] A through hole is arranged at the bottom of the lower shell 13, which is used for the through hole to leave the shell. As a preferred embodiment, the bottom of the lower shell 13 can be arranged as a ring structure with the edge inwardly folded. A gasket 131 with holes is arranged in the hollow cavity of the ring. The gasket 131 is freely rotatable, and a through hole is arranged on the gasket for the through hole to leave the shell.

[0042] The microporous flow control unit 2 is arranged in the upper shell 11. The microporous flow control unit 2 can adopt a microporous flow control unit as shown in the accompanying drawings. Figure 6 The microporous flow control unit 2 includes an upper assembly 21 and a lower assembly 22. The upper assembly 21 can be a barrel-shaped structure with an opening at the top and a through hole at the bottom. An assembly opening 211 extends inwardly at the through hole. The lower assembly 22 includes a gas guide pipe 221 at the top, a microporous assembly 222 in the middle, and a gas outlet pipe 223 at the bottom. The gas guide pipe 221 is connected above the microporous assembly 222, and the upper end passes through the opening at the top of the upper assembly 21. The gas guide pipe 221 is used to connect the gas inlet pipe 212 at the top of the microporous flow control unit 2. The gas outlet pipe 223 is connected below the microporous assembly 222. The microporous assembly 222 is internally provided with micropores for guiding the gas guide pipe 221 and the gas outlet pipe 223. O-rings 4 are arranged on the outer wall of the microporous assembly 222 and the assembly opening 211 of the upper assembly 21. The lower assembly 22 is inserted into the assembly opening 211 of the upper assembly 21 and fixedly connected by the two O-rings 4.

[0043] The top of the micro-porous flow control unit 2 is provided with an air inlet pipe 212 fixedly connected with the air inlet of the micro-porous flow control unit 2, which can be connected by screwing and then locked by a nut. The lower end of the air outlet pipe is provided with an O-shaped sealing ring, and the lower end of the air outlet pipe is inserted into the assembly hole 1121 of the cross beam 112 and fixedly connected by two O-shaped sealing rings 4.

[0044] The outer wall of the micro-porous flow control unit 2 is provided with an elastic positioning ring which cooperates with the positioning groove 111 of the inner wall of the upper shell 11 to position the micro-porous flow control unit 2. The upper part of the micro-porous flow control unit 2 is limited and fixed by a metal ring-shaped gasket 5 at the top of the micro-porous flow control unit 2. The metal ring-shaped gasket 2 is a metal ring-shaped gasket with an inner diameter that can be controlled in extension, for example, a clasp spring can be used as the metal ring-shaped gasket. The micro-porous flow control unit is provided with a suspender 6 at the upper end, and the suspender 6 is provided with a lifting ring. The suspender is used to connect a suspension line, and the hydrophobic hollow fiber micro-porous membrane bundle assembly of the present application can be hung on the fixing member at the top of the gas injection well through the suspension line.

[0045] The structure of the lower end of the micro-porous flow control unit 2 is not unique. For example, in order to simplify the structure, the air outlet pipe 223 at the lower end of the micro-porous flow control unit can be directly connected with the air inlet 32221 on the air inlet cover 322 at the top of the hydrophobic hollow fiber micro-porous membrane bundle 3. The connection method can be various, for example, the above-mentioned two sealing ring embedding and fixed connection method can be adopted.

[0046] The hydrophobic hollow fiber micro-porous membrane bundle 3 includes a plurality of vertically arranged membrane filaments 31, an upper sealing part 32 arranged at the top of the membrane filaments 31, and a lower sealing part 33 arranged at the lower end of the membrane filaments 31. The membrane filaments 31 can be made of polypropylene material, and the membrane filaments 31 are distributed with tiny air holes.

[0047] The upper sealing part 32 includes a resin glue sealing layer 321 arranged between the membrane filaments 31 and outside the membrane bundle. The top end opening of the membrane filaments 31 is located on the upper surface of the resin sealing layer 321, and the top end opening of the membrane filaments 31 is communicated with the inner cavity of the membrane filaments. The resin glue sealing layer 321 of the upper sealing part 32 of the hydrophobic hollow fiber micro-porous membrane bundle 3 is provided with an air inlet cover 322, which includes a lower pipe part 3221 and a top cover 3222. The air inlet 32221 is arranged on the top cover 3222. The outer peripheral surface of the resin sealing layer 321 is sealingly and fixedly connected with the inner wall surface of the lower pipe part 3221 of the air inlet cover 322. The air inlet cover 322 is sealingly and detachably connected with the upper shell 11.

[0048] The lower part of the hydrophobic hollow fiber micro-porous membrane bundle 3 is provided with a clamp 34 for tightening the lower part of the hydrophobic hollow fiber micro-porous membrane bundle 3 into a bundle.

[0049] The lower sealing part 33 of the lower end of the membrane filaments 31 is arranged in the lower end openings of the membrane filaments 31, between the lower ends of the membrane filaments and outside the membrane filament bundle, and the lower end openings of the membrane filaments 31 are closed.

[0050] The preparation method of the hydrophobic hollow fiber microporous membrane bundle 3 comprises the following steps:

[0051] S1, the upper ends of the required number of hydrophobic hollow fiber microporous membrane bundle filaments are respectively passed through each through hole on the uniform distribution plate, so that the hydrophobic hollow fiber microporous membrane bundle filaments are arranged on the uniform distribution plate at a set interval, and the upper ends of the hydrophobic hollow fiber microporous membrane bundle filaments are higher than the set length of the uniform distribution plate;

[0052] S2, epoxy resin is coated on the hydrophobic hollow fiber microporous membrane bundle filaments above the uniform distribution plate, so that the epoxy resin fills the gaps between the hydrophobic hollow fiber microporous membrane bundle filaments, and the coating position of the epoxy resin extends to the outside of the outermost hydrophobic hollow fiber microporous membrane bundle filament, forming an outer edge sealing layer, and a tube plate is sleeved on the edge of the outer edge sealing layer, the lower end of the tube plate is kept at the same horizontal plane as the upper surface of the uniform distribution plate;

[0053] S3, after the epoxy resin is cured, the set thickness of the cured layer is cut off, the closed part of the membrane filament top end is cut off, the top end opening of the hydrophobic hollow fiber microporous membrane bundle filament is exposed, and the top end opening is kept through with the inside of the membrane filament;

[0054] S4, epoxy resin is coated on the outer wall of the tube plate, and the gas inlet connecting cover is sealingly and fixedly connected with the tube plate;

[0055] S5, the lower end of the hydrophobic hollow fiber microporous membrane bundle filament is tightly tied, and epoxy resin is used for sealing treatment of the lower end of the hydrophobic hollow fiber microporous membrane bundle filament, after the epoxy resin is cured, the lower end opening of the hydrophobic hollow fiber microporous membrane bundle filament is closed by the epoxy resin, and the preparation of the hydrophobic hollow fiber microporous membrane bundle is completed.

[0056] It should be noted that the uniform distribution plate described above can be a circular thin plate, the diameter of which is adapted to the diameter of the hydrophobic hollow fiber microporous membrane bundle, and a coating layer is coated on the upper surface of the uniform distribution plate, which can prevent the uniform distribution plate from being bonded and fixed with the epoxy resin, so as to facilitate the subsequent removal of the uniform distribution plate. The thin plate is uniformly distributed with uniform distribution holes, and the upper ends of the hydrophobic hollow fiber microporous membrane bundle filaments are respectively passed through each through hole on the uniform distribution plate, and 9 membrane filaments are passed through each hole. The purpose of this hollow fiber membrane bundle is to facilitate the subsequent uniform coating of epoxy resin on the hollow fiber membrane filaments. After the membrane filaments are uniformly coated with epoxy resin, a period of time is allowed to pass, and after the epoxy resin is cured, the uniform distribution plate can be removed, and the uniform distribution plate can be repeatedly used.

[0057] The hydrophobic hollow fiber microporous membrane bundle assembly of the present application, in use, the boom at the top of the microporous flow control unit is connected to the fixing member above the gas injection well through the suspension line, the gas source is connected to the gas inlet pipe of the microporous flow control unit through the gas guide pipe, then the flow of the microporous flow control unit is adjusted, the hydrophobic hollow fiber microporous membrane bundle assembly is placed into the water body in the gas injection well, the gas valve of the gas source is opened, the compressed gas enters into each hydrophobic hollow fiber microporous membrane bundle filament through the gas inlet of the gas inlet connecting cover on the microporous flow control unit and the hydrophobic hollow fiber microporous membrane bundle respectively, under the action of the hydrophobic hollow fiber microporous membrane bundle filament, the compressed gas enters into the water body through the tiny pores on the membrane filament, through mass transfer, the gas and liquid mixture diffuse into the underground water body through the through hole on the shell, the impurities in the underground water body are settled, and the effect of purifying the underground water body is achieved.

[0058] The hydrophobic hollow fiber microporous membrane bundle of the present application uses hydrophobic hollow fiber microporous membrane filaments, the membrane pores are not easy to be blocked by underground water to form a water curtain, and the gas mass transfer process of the fiber membrane pores can be stable and orderly. The hollow fiber microporous membrane material used in the present application has the advantages of good chemical stability, high mechanical strength, good oxidation resistance, high flux, and large surface area which is beneficial to mass transfer. Compared with other types of membrane assemblies, the hydrophobic hollow fiber microporous membrane bundle of the present application has a large packing density and can provide a large specific surface area; the fiber membrane is a self-supporting structure and does not require other support bodies; the membrane surface can provide a carrier for biological adhesion and has good pressure resistance.

[0059] The vacuum fiber membrane filaments of the present application are arranged in parallel, without the need for using a membrane winding device, which reduces the manufacturing process of the assembly and reduces the cost of equipment use and manufacturing. The hollow fiber membranes are arranged using a uniform distribution plate, which is efficient and convenient, the membrane end face and the inside are arranged in a certain order, the consistency of the membrane assembly is controllable, and the gap size between the fixed end hollow fiber membranes is controllable, so the gas channels inside the membrane assembly are relatively uniform, and therefore the gas mass transfer efficiency of the membrane element is greatly improved. The end of the hollow fiber membrane bundle is tightened using a clamp, and then epoxy resin material is applied at the end, which saves epoxy resin raw materials and saves manufacturing costs.

[0060] The microporous flow control unit of the present application is built into the metal shell of the assembly, adjusts the pressure difference of the gas before entering the fiber membrane through the micropores, ensures the stability of the gas pressure entering the hydrophobic hollow fiber microporous membrane bundle, greatly improves the gas utilization efficiency, and the mass transfer process in the fiber membrane can be efficient and orderly. Furthermore, the microporous flow control unit of the present application can calculate the gas pressure difference before and after the micropores according to the inlet pressure and the water head pressure received by the depth of the hollow fiber membrane assembly immersed in the underground water, and further calculate the micropore diameter. According to this principle, combined with the inlet pressure adjustment and the actual situation of the underground water injection well in the engineering site, a specific micropore diameter is configured, and a microporous flow control unit that meets the actual situation is customized.

[0061] The upper sealing part of the hydrophobic hollow fiber microporous membrane bundle of the application and the upper shell, the micropore flow control unit and the upper shell and the crossbeam, the upper and lower components of the micropore flow control unit, the upper shell and the middle shell, and the middle shell and the lower shell can be fixedly connected by embedding O-shaped sealing rings with each other, so that the assembly and disassembly of each component are convenient, the actual operation is strong, and the work efficiency of the engineering site is greatly improved.

[0062] The hollow support structure in the internal cavity is conducive to the settlement of impurities around the fiber membrane during the mass transfer process of the fiber membrane in the groundwater environment, so that the impurities will not settle at the bottom of the fiber membrane and will not form a blockage. The hollow support structure is arranged at the lower side of the inside of the middle shell, and has a supporting effect on the fiber membrane bundle, so that it is not necessary to make a groove at the bottom of the shell to fix the fiber membrane bundle, the manufacturing process is simplified, the amount of hollow fiber membrane is reduced, and the manufacturing cost is saved.

[0063] The hydrophobic hollow fiber microporous membrane bundle assembly has an outer diameter of 41mm and a length of 321mm, has a small volume, can be flexibly used in a small-diameter groundwater gas injection well, and has the advantages of simple structure, convenient disassembly, light weight and the like, can be quickly transferred from one gas injection well to another gas injection well, saves time and effort, and greatly improves the disposal efficiency of the engineering.

[0064] Although the embodiments of the application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A bundle of hydrophobic hollow fiber microporous membranes, characterized by: It includes a shell, a microporous flow control unit and a hydrophobic hollow fiber microporous membrane bundle, a cavity is arranged in the shell, the microporous flow control unit is arranged in the shell and located at the upper part, and the hydrophobic hollow fiber microporous membrane bundle is arranged in the shell and located below the microporous flow control unit. The hydrophobic hollow fiber microporous membrane bundle includes a plurality of vertically arranged membrane filaments, an upper sealing part arranged at the top of the membrane filaments and a lower sealing part arranged at the lower end of the membrane filaments, the upper sealing part includes a resin glue sealing layer, the resin sealing layer is arranged between the membrane filaments and outside the membrane filament bundle, the top end opening of the membrane filament is located on the upper surface of the resin sealing layer, and the top end opening of the membrane filament is communicated with the inner cavity of the membrane filament, the lower sealing part of the lower end of the membrane filament is arranged in the lower end opening of the membrane filament, between the lower ends of the membrane filaments and outside the membrane filament bundle, and the lower end opening of the membrane filament is closed. The top of the microporous flow control unit is provided with an air inlet for connecting with an air source, and the lower end of the microporous flow control unit is provided with an air outlet, the gas output by the air outlet enters the membrane filaments through the air inlet on the air inlet connecting cover and the top end opening of the membrane filaments. A plurality of through holes are distributed on the side wall of the shell corresponding to the membrane filaments, and the through holes are communicated with the cavity outside the membrane filaments.

2. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 1, wherein: The shell includes an upper shell, a middle shell and a lower shell, the microporous flow control unit is arranged in the upper shell, the hydrophobic hollow fiber microporous membrane bundle is arranged in the middle shell, the lower end of the upper shell is sealingly and detachably connected with the upper end of the middle shell, the lower end of the middle shell is sealingly and detachably connected with the upper end of the lower shell, the through holes are arranged on the side wall of the middle shell, and a through hole is arranged on the bottom of the lower shell.

3. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 1, wherein: The top of the microporous flow control unit is provided with an air inlet for connecting with an air source, and the lower end of the microporous flow control unit is provided with an air outlet, the gas output by the air outlet enters the membrane filaments through the air inlet on the air inlet connecting cover and the top end opening of the membrane filaments.

4. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 2, wherein: The inner wall of the upper shell is provided with a positioning groove, the outer wall of the microporous flow control unit is provided with an elastic positioning ring corresponding to the positioning groove, a cross beam is further arranged in the upper shell, the cross beam is arranged at the lower part of the upper shell, the middle part of the cross beam is provided with an assembly hole, a sealing ring is arranged in the assembly hole, an air outlet pipe is connected with the air outlet at the lower end of the microporous flow control unit, a sealing ring corresponding to the sealing ring in the assembly hole is arranged on the air outlet pipe, the air outlet pipe is sealingly connected with the assembly hole on the cross beam through the sealing ring, and a limiting rib for limiting the air outlet pipe is arranged at the bottom of the assembly hole.

5. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 2, wherein: The resin glue sealing layer of the upper sealing part of the hydrophobic hollow fiber microporous membrane bundle is provided with an air inlet connecting cover, the air inlet connecting cover includes a lower pipe part and a top cover, an air inlet is arranged on the top cover, the outer peripheral surface of the resin sealing layer is sealingly and fixedly connected with the inner wall surface of the lower pipe part of the air inlet connecting cover, and the air inlet connecting cover is sealingly and detachably connected with the upper shell.

6. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 1, wherein: The lower part of the hydrophobic hollow fiber microporous membrane bundle is provided with a clamp, and the clamp is used for tightening the lower part of the hydrophobic hollow fiber microporous membrane bundle into a bundle.

7. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 2, wherein: The middle shell is internally provided with a support frame, which comprises a positioning support ring and a plurality of skeletons. The outer ends of the skeletons are fixedly connected to the inner wall of the middle shell, and the inner ends of the skeletons are fixedly connected to the positioning support ring. The aperture of the positioning support ring matches the diameter of the lower end of the bundle of hydrophobic hollow fiber microporous membranes after being tightened and bundled. The lower end of the bundle of hydrophobic hollow fiber microporous membranes passes through the positioning support ring, and the positioning support ring supports and positions the bundle of hydrophobic hollow fiber microporous membranes.

8. The hydrophobic hollow-fiber microporous membrane bundle assembly of claim 2, wherein: The top opening of the upper shell is provided with a metal annular gasket for limiting the microporous flow control unit. The metal annular gasket is a metal annular gasket with an expandable inner diameter. The upper end of the microporous flow control unit is provided with a suspender for connecting a suspension line.

9. A method for producing a bundle of hydrophobic hollow fiber microporous membranes for use in the bundle assembly of hydrophobic hollow fiber microporous membranes according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1, the upper ends of the required number of hydrophobic hollow fiber microporous membrane bundle filaments are respectively passed through the through holes on the uniform distribution plate, so that the hydrophobic hollow fiber microporous membrane bundle filaments are arranged on the uniform distribution plate at a set interval, and the upper ends of the hydrophobic hollow fiber microporous membrane bundle filaments are higher than the set length of the uniform distribution plate; S2, epoxy resin is applied on the hydrophobic hollow fiber microporous membrane bundle filaments above the uniform distribution plate, so that the epoxy resin fills the gaps between the hydrophobic hollow fiber microporous membrane bundle filaments, and the application position of the epoxy resin extends to the outside of the outermost hydrophobic hollow fiber microporous membrane bundle filament to form an outer edge sealing layer. A tube plate is sleeved on the edge of the outer edge sealing layer, and the lower end of the tube plate is kept at the same horizontal plane as the upper surface of the uniform distribution plate; S3, after the epoxy resin is cured, the cured layer with a set thickness is cut off, the closed part of the top end of the membrane filament is cut off, the top end opening of the hydrophobic hollow fiber microporous membrane bundle filament is exposed, and the top end opening is kept in communication with the inside of the membrane filament; S4, epoxy resin is applied on the outer wall of the tube plate, and the gas inlet connecting cover is sealingly and fixedly connected with the tube plate; S5, the lower end of the hydrophobic hollow fiber microporous membrane bundle filament is tightly tied, and the lower end of the hydrophobic hollow fiber microporous membrane bundle filament is subjected to epoxy resin sealing treatment. After the epoxy resin is cured, the lower end opening of the hydrophobic hollow fiber microporous membrane bundle filament is closed by the epoxy resin, and the preparation of the hydrophobic hollow fiber microporous membrane bundle is completed.

10. The method of claim 9, wherein: The lower end of the hydrophobic hollow fiber microporous membrane bundle filament is tightly fixed by a hoop.

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