External pressure type hollow fiber nanofiltration membrane production line

Abstract

The utility model discloses an external pressure type hollow fiber nanofiltration membrane production line which comprises a spinning system, a cleaning system, a drying system, an oil-water phase reaction system, a power traction system, a purging system and a filament collecting system, the casting membrane cleaning system is arranged between the spinning system and the oil-water phase reaction system, the membrane reaction cleaning system is arranged between the oil-water phase reaction system and the filament collecting system, the drying systems are arranged in front of and behind the membrane reaction cleaning system, and the oil-water phase reaction system comprises a water phase system and an oil phase system. The purging systems are respectively arranged between the casting membrane cleaning system and the oil-water phase reaction system and between the water phase system and the oil phase system. The spinning system, the cleaning system, the oil-water phase reaction system, the drying system, the purging system and the filament collecting system are organically combined, so that high efficiency and systematization of membrane production are realized, and the production efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nanofiltration membrane production technical field, specifically is a kind of hollow fiber nanofiltration membrane production line of outer pressure type. BACKGROUND

[0002] Nanofiltration membrane (Nanofiltration Membranes) is a new type of separation membrane in the late 80s, its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-1000.Currently, the roll type nanofiltration membrane of Dow, general electric and many companies occupies the dominant position in the market.Nanofiltration is a new type of membrane separation technology in recent years and begins to be applied in water softening and other fields, and receives very good effect.Currently, nanofiltration is receiving more and more attention, and plays its unique role in many fields such as brackish water desalination, application water purification, wastewater treatment, biochemical product grading and concentration.

[0003] In recent years, nanofiltration membrane (NF) has been valued in the application of municipal water treatment due to its wide separation range, because nanofiltration membrane can not only soften and desalt raw water under low pressure, but also can remove trihalomethane (THM), color, bacteria, viruses and dissolved organic matter, so it is increasingly favored.In the separation process, it can intercept organic matter in water, realize the separation of high molecular weight and low molecular weight (200-1000MW) organic matter, and simultaneously dialysis salt, that is, it integrates concentration and dialysis.In the application of monovalent salt in water, high desalination rate is not required, and the separation of different valence ions can be realized.Because inorganic salt can pass through nanofiltration membrane and dialysis, the reverse osmosis pressure of nanofiltration process is much lower than that of reverse osmosis process, so low pressure operation can be realized, and power is saved.

[0004] At present, the traditional hollow fiber nanofiltration membrane production process still has many problems, such as low production efficiency, unstable membrane quality, high energy consumption and the like.Especially in the key links of membrane phase transition, cleaning, reaction and drying, there is lack of systematic production line design, so that the membrane performance is difficult to reach the ideal state.

[0005] To solve the above problems, the present application provides a kind of hollow fiber nanofiltration membrane production line of outer pressure type. Utility model content

[0006] The utility model aims at overcoming the above problems or at least partially solving the above problems, and provides a kind of hollow fiber nanofiltration membrane production line of outer pressure type.

[0007] To achieve the above object, the utility model discloses the following technical scheme: a kind of outer pressure type hollow fiber nanofiltration membrane production line, including spinning system, cleaning system, drying system, oil-water phase reaction system, power traction system, purging system and silk receiving system, the cleaning system includes film casting cleaning system and membrane reaction cleaning system, the film casting cleaning system is arranged between spinning system and oil-water phase reaction system, for accelerating the phase transition of membrane and cleaning solvent and pore-forming agent used in membrane preparation, the membrane reaction cleaning system is arranged between oil-water phase reaction system and silk receiving system, for cleaning the solution of membrane reaction, the drying system is arranged before and after membrane reaction cleaning system, the oil-water phase reaction system includes water phase system and oil phase system, the purging system is arranged between film casting cleaning system and oil-water phase reaction system respectively, and between water phase system and oil phase system.

[0008] In a preferred embodiment, the spinning system includes an air compressor, the air compressor is connected with a raw material storage tank, the raw material storage tank is connected with a raw material filter disc, the raw material filter disc is connected with a raw material pump, the raw material pump extrudes the raw material through a spinning head, the spinning head includes a raw material end and a core liquid end, the core liquid end is connected with a core liquid storage tank, and kinetic energy is provided by a core liquid pump, and the core liquid end of the spinning head is connected with a core liquid filter disc between the core liquid pump.

[0009] In a preferred embodiment, the film casting cleaning system includes a gel tank, a rinsing tank A and an annealing tank A arranged in sequence from front to back, and the membrane reaction cleaning system includes a rinsing tank B and an annealing tank B arranged in sequence from front to back.

[0010] In a preferred embodiment, the water phase system includes a water phase soaking pool, the water phase soaking pool is connected with a water phase feed liquid tank, the water phase feed liquid tank is connected with a water phase filter disc, and the water phase filter disc is connected with a water phase circulating pump.

[0011] In a preferred embodiment, the oil phase system includes an oil phase receiving disc and an oil phase feed liquid tank, the oil phase receiving disc is connected with an oil phase waste liquid tank, the oil phase feed liquid tank is connected with an oil phase filter disc, the oil phase filter disc is connected with an oil phase feed pump, and the oil phase feed pump is connected with an oil phase coating head, for dropping oil phase to the surface of membrane silk through a vertical downward slit.

[0012] In a preferred embodiment, an oil-water phase temperature control device is further arranged between the water phase system and the oil phase system.

[0013] In a preferred embodiment, the purging system includes a base film purging system, an aqueous phase purging system, and a surface moisture purging system. Each of the base film purging system, aqueous phase purging system, and surface moisture purging system includes a slit blower and a blower. The base film purging system is disposed between the casting cleaning system and the oil-water phase reaction system. The aqueous phase purging system and the surface moisture purging system are disposed sequentially between the aqueous phase system and the oil phase system.

[0014] In a preferred embodiment, the take-up system includes two rolling take-up shafts, a take-up shaft adjuster, a rotating motor, and a support frame. The take-up shafts are made of soft silicone with bearings encased in them. The take-up shafts are connected to the take-up shaft adjuster. The rotating motor is connected to the take-up shafts and is used to rotate them for take-up. The support frame is used to support the entire take-up system.

[0015] In a preferred embodiment, the drying system includes a pre-drying system and a post-drying system.

[0016] In a preferred embodiment, the power traction system includes a plurality of power transmission shafts.

[0017] Compared with existing technologies, this utility model provides an external pressure hollow fiber nanofiltration membrane production line. Through the organic combination of a spinning system, a cleaning system, an oil-water phase reaction system, a drying system, a purging system, and a winding system, it achieves high efficiency and systematization in membrane production, significantly improving production efficiency. The inclusion of a casting cleaning system and a membrane reaction cleaning system effectively accelerates the membrane phase transition process and thoroughly cleans residual solvents, pore-forming agents, and reaction solutions from the membrane fabrication process, ensuring membrane quality and performance. The base membrane purging system, aqueous phase purging system, and surface moisture purging system effectively control the moisture and wettability of the membrane fibers, reducing aqueous phase dilution and making the oil phase reaction more uniform, further improving membrane consistency. The pre-drying system and post-drying system thoroughly remove residual oil phase from the membrane surface, ensuring membrane dryness and stability and extending membrane service life. Attached Figure Description

[0018] Figure 1 This is a complete production line diagram of the hollow fiber nanofiltration membrane production line of this utility model;

[0019] Figure 2 This is a schematic diagram of the spinning system of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the oil-water phase reaction system of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the wire take-up system of this utility model;

[0022] Figure 5This is a schematic diagram of the purging system of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the oil phase coating head of this utility model.

[0024] In the diagram: 1. Air compressor; 2. Raw material storage tank; 3. Raw material controller; 4. Raw material filter disc; 5. Raw material pump; 6. Spinning head; 7. Core liquid storage tank; 8. Core liquid pump; 9. Core liquid filter disc; 10. Gel tank; 11. Rinse tank A; 12. Annealing tank A; 13. Base film purging system; 14. Aqueous phase soaking tank; 15. Aqueous phase feed tank; 16. Aqueous phase filter disc; 17. Aqueous phase circulation pump; 18. Aqueous phase purging system; 19. Surface water 20. Oil phase receiving tray; 21. Oil phase liquid tank; 22. Oil phase filter plate; 23. Oil phase feed pump; 24. Oil phase coating head; 25. Oil phase waste liquid tank; 26. Oil-water phase temperature control device; 27. Pre-drying system; 28. Rinse tank B; 29. ​​Annealing tank B; 30. Post-drying system; 31. Take-up shaft; 32. Take-up shaft adjuster; 33. Rotary motor; 34. Support frame; 35. Slit blower head; 36. Blower. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this description, those skilled in the art can make creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0027] This utility model discloses an external pressure hollow fiber nanofiltration membrane production line, which solves the technical problems in the prior art. The overall concept is as follows:

[0028] Example 1:

[0029] Please see Figures 1-6An external pressure hollow fiber nanofiltration membrane production line includes a spinning system, a cleaning system, a drying system, an oil-water phase reaction system, a power traction system, a purging system, and a take-up system. The cleaning system includes a casting cleaning system and a membrane reaction cleaning system. The casting cleaning system is located between the spinning system and the oil-water phase reaction system to accelerate the phase transition of the membrane and clean the solvent and pore-forming agent used in membrane formation. The membrane reaction cleaning system is located between the oil-water phase reaction system and the take-up system to clean the solution used in the membrane reaction. The drying system is located before and after the membrane reaction cleaning system. The oil-water phase reaction system includes an aqueous phase system and an oil phase system. The purging systems are located between the casting cleaning system and the oil-water phase reaction system, and between the aqueous phase system and the oil phase system, respectively. The purging system utilizes the Cohen effect, which refers to the phenomenon where a high-speed airflow passing through a narrow slit creates a low-pressure zone on both sides, thereby attracting surrounding air to form a larger airflow.

[0030] In specific implementation, the spinning system includes an air compressor 1 connected to a raw material storage tank 2 to provide pressure for the raw material and to transport it. The raw material storage tank 2 is connected to a raw material filter disc 4 to filter insoluble large particles and impurities in the raw material liquid. After the raw material filter disc 4, a raw material pump 5 is connected to transport the raw material. The raw material pump 5 extrudes the raw material through a spinning head 6. The spinning head 6 includes a raw material end and a core liquid end. The core liquid end is connected to a core liquid storage tank 7 and is powered by a core liquid pump 8. A core liquid filter disc 9 is connected between the core liquid end of the spinning head 6 and the core liquid pump 8 to filter impurities and large particles. The drying system includes a pre-drying system 27 and a post-drying system 30. The pre-drying system 27 is used to remove the oil phase remaining on the surface during the membrane reaction, and the post-drying system 30 is used to dry the membrane. The power traction system includes several power transmission shafts to provide transportation.

[0031] In practice, the film casting cleaning system includes a gel tank 10, a rinsing tank A11, and an annealing tank A12 arranged sequentially from front to back, which are used to accelerate the phase transformation of the membrane and clean the solvent and pore-forming agent used in the film casting process. The membrane reaction cleaning system includes a rinsing tank B28 and an annealing tank B29 arranged sequentially from front to back, which are used to clean the solution used in the membrane reaction.

[0032] In practical implementation, the aqueous phase system includes an aqueous phase soaking tank 14 to ensure the membrane is completely submerged in the aqueous solution. The aqueous phase soaking tank 14 is connected to an aqueous phase feed tank 15, allowing the reacted feed solution to return to the feed tank. The aqueous phase feed tank 15 is connected to an aqueous phase filter plate 16 to filter impurities in the aqueous phase. The aqueous phase filter plate 16 is connected to an aqueous phase circulation pump 17 to add the solution from the aqueous phase tank into the aqueous phase soaking tank 14. The entire aqueous phase system maintains the concentration of the aqueous phase reaction while ensuring complete membrane contact. The oil phase system includes an oil phase receiving plate 20 and an oil phase feed tank 21. The oil phase receiving plate 20 is connected to an oil phase waste liquid tank 25. The oil phase receiving tray 20 catches the reacted oil phase solution and collects it into the oil phase waste liquid tank 25. The oil phase feed tank 21 is used to store the oil phase solution. The oil phase feed tank 21 is connected to the oil phase filter plate 22 to filter impurities in the oil phase. The oil phase filter plate 22 is connected to the oil phase feed pump 23 to provide power to the solution in the oil phase feed tank 21. The oil phase feed pump 23 is connected to the oil phase coating head 24 to drip the oil phase onto the membrane fiber surface through a vertically downward slit. An oil-water phase temperature control device 26 is also provided between the aqueous phase system and the oil phase system for temperature control, which is beneficial for controlling the optimal temperature of the oil-water reaction.

[0033] In specific implementation, the purging system includes a base film purging system 13, an aqueous phase purging system 18, and a surface moisture purging system 19. Each of the base film purging system 13, aqueous phase purging system 18, and surface moisture purging system 19 includes a slit blower head 35 and a blower 36. The base film purging system 13 is located between the casting cleaning system and the oil-water phase reaction system to control the moisture content of the base film during the oil-water phase reaction, which is more conducive to the reaction and reduces the dilution of the aqueous phase. The aqueous phase purging system 18 and the surface moisture purging system 19 are sequentially located between the aqueous phase system and the oil phase system to effectively remove water droplets from the surface of the membrane fibers and control the wettability of the membrane fiber surface, making the reaction of the oil phase more uniform and effective.

[0034] In practical implementation, the take-up system includes two rolling take-up shafts 31, a take-up shaft adjuster 32, a rotating motor 33, and a support frame 34. The take-up shafts 31 are made of soft silicone with bearings, which can reduce the contact between the film and the shaft, prevent scratches on the film surface, and control the generation of defects. The take-up shafts 31 are connected to the take-up shaft adjuster 32, which can control and adjust the distance between the two take-up shafts and control the take-up length. The rotating motor 33 is connected to the take-up shafts 31 and is used to rotate for take-up. The support frame 34 is used to support the entire take-up system.

[0035] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, and the specific work is as follows:

[0036] First, the raw material is pressurized and transported from the raw material storage tank 2 by the air compressor 1. After passing through the raw material filter plate 4 to remove insoluble large particles and impurities, it is transferred to the spinning head 6 by the raw material pump 5. At the same time, the core liquid is filtered from the core liquid storage tank 7 through the core liquid pump 8 and the core liquid filter plate 9 and enters the core liquid end of the spinning head 6. The raw material and core liquid are extruded together in the spinning head 6 to form hollow fiber membrane filaments. Next, the membrane filaments enter the casting and cleaning system, passing through the gel tank 10, the rinsing tank A11 and the annealing tank A12 in sequence to accelerate the phase transformation process of the membrane and clean away the solvent and pore-forming agent remaining in the membrane formation process. Subsequently, the cleaned membrane filaments enter the oil-water phase reaction system. First, they are completely immersed in the aqueous phase solution in the aqueous phase soaking tank 14 to carry out the reaction. Then, the oil phase solution is evenly dripped onto the surface of the membrane filaments through the oil phase coating head 24 to complete the oil-water phase reaction. The oil-water phase temperature control device 26 precisely controls the reaction temperature to ensure the reaction effect.

[0037] After the reaction, the membrane fibers enter the membrane reaction cleaning system, passing sequentially through rinsing tank B28 and annealing tank B29 to remove residual solution from the reaction process and further optimize membrane performance. Simultaneously, a base membrane purging system 13 is installed between the casting cleaning system and the oil-water phase reaction system to control the moisture content of the base membrane and reduce aqueous phase dilution. An aqueous phase purging system 18 and a surface moisture purging system 19 are sequentially installed between the aqueous phase system and the oil phase system to remove water droplets from the membrane fiber surface, control the degree of wetting, and make the oil phase reaction more uniform and effective. Afterward, the membrane fibers pass through a pre-drying system 27 to remove residual oil phase from the surface, and then through a post-drying system 30 for thorough drying to ensure membrane dryness and stability. Finally, the dried membrane fibers enter the winding system, where two winding shafts 31 driven by a rotating motor 33 wind the fibers. A winding shaft adjuster 32 adjusts the distance between the two winding shafts to control the winding length, and a support frame 34 ensures the stable operation of the entire winding system.

[0038] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An outside pressure type hollow fiber nanofiltration membrane production line, characterized by: The spinning system, the cleaning system, the drying system, the oil-water phase reaction system, the power traction system, the blowing system and the receiving system, the cleaning system includes the film casting cleaning system and the film reaction cleaning system, the film casting cleaning system is arranged between the spinning system and the oil-water phase reaction system, which is used to accelerate the phase transition of the film and clean the solvent and the pore-forming agent used for film preparation, the film reaction cleaning system is arranged between the oil-water phase reaction system and the receiving system, which is used to clean the solution of the film reaction, the drying system is arranged before and after the film reaction cleaning system, the oil-water phase reaction system includes the water phase system and the oil phase system, the blowing system is arranged between the film casting cleaning system and the oil-water phase reaction system, and between the water phase system and the oil phase system.

2. An outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The spinning system includes an air compressor (1), the air compressor (1) is connected with a raw material storage tank (2), the raw material storage tank (2) is connected with a raw material filter disc (4), the raw material filter disc (4) is connected with a raw material pump (5) in sequence, the raw material pump (5) extrudes the raw material into a shape through a spinning head (6), the spinning head (6) includes a raw material end and a core liquid end, the core liquid end is connected with a core liquid storage tank (7) and provides kinetic energy through a core liquid pump (8), and the core liquid end of the spinning head (6) is connected with the core liquid pump (8) through a core liquid filter disc (9) in the middle.

3. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The film casting cleaning system includes a gel tank (10), a rinsing tank A (11) and an annealing tank A (12) arranged in sequence from front to back, and the film reaction cleaning system includes a rinsing tank B (28) and an annealing tank B (29) arranged in sequence from front to back.

4. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The water phase system includes a water phase immersion pool (14), the water phase immersion pool (14) is connected with a water phase solution tank (15), the water phase solution tank (15) is connected with a water phase filter disc (16), and the water phase filter disc (16) is connected with a water phase circulating pump (17).

5. An outside pressure type hollow fiber nanofiltration membrane production line according to claim 4, characterized in that: The oil phase system includes an oil phase receiving disc (20) and an oil phase solution tank (21), the oil phase receiving disc (20) is connected with an oil phase waste liquid tank (25), the oil phase solution tank (21) is connected with an oil phase filter disc (22), the oil phase filter disc (22) is connected with an oil phase feeding pump (23), and the oil phase feeding pump (23) is connected with an oil phase coating head (24) for dropping the oil phase to the surface of the film yarn through a vertical downward slit.

6. An outside pressure type hollow fiber nanofiltration membrane production line according to claim 5, characterized in that: An oil-water phase temperature control device (26) is further arranged between the water phase system and the oil phase system.

7. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The blowing system includes a base film blowing system (13), a water phase blowing system (18) and a surface moisture blowing system (19), the base film blowing system (13), the water phase blowing system (18) and the surface moisture blowing system (19) all include a slit blowing head (35) and a blower (36), the base film blowing system (13) is arranged between the film casting cleaning system and the oil-water phase reaction system, and the water phase blowing system (18) and the surface moisture blowing system (19) are arranged between the water phase system and the oil phase system in sequence.

8. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The yarn collecting system comprises two rolling yarn collecting shafts (31), a yarn collecting shaft adjuster (32), a rotating motor (33) and a support frame (34), the yarn collecting shaft (31) is made of a bearing wrapped with soft silica gel, the yarn collecting shaft (31) is connected with the yarn collecting shaft adjuster (32), the rotating motor (33) is connected with the yarn collecting shaft (31) and is used for rotating to collect yarn, and the support frame (34) is used for supporting the whole yarn collecting system.

9. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The drying system comprises a front drying system (27) and a rear drying system (30).

10. The outside pressure type hollow fiber nanofiltration membrane production line according to claim 1, characterized in that: The power traction system comprises a plurality of power conveying shafts.

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