High-efficiency and high-precision combined liquid-solid separation system

Abstract

The utility model discloses a high-efficiency high-precision combined type liquid-solid separation system, which comprises a pretreatment system, a membrane separation system and a slag slurry recovery system, the pretreatment system comprises a liquid-solid micro-cyclone liquid separator, a stock solution enters the liquid-solid micro-cyclone liquid separator through a stock solution pump to remove solids and suspended solids, and the membrane separation system is connected with the slag slurry recovery system. The membrane separation system comprises a security filter and a membrane filter, the pretreated stock solution sequentially passes through the security filter and the membrane filter to intercept and remove impurities, and the slag slurry recovery system is used for carrying out liquid-solid separation on bottom residues of the liquid-solid micro cyclone separator, the security filter and the membrane filter. The membrane can be repeatedly cleaned and regenerated for use, the service life is as long as 3-4 years, the consumption cost is reduced, the membrane separation adopts a cross-flow operation mode, the problems of pollution and blockage can be solved, the cleaning is convenient, the separation precision and efficiency are high, the separation effect is good, the system flux is large, the occupied area is small, and the investment of hardware facilities can be reduced.

Description

Technical Field

[0001] This utility model specifically relates to a high-efficiency and high-precision combined liquid-solid separation system. Background Technology

[0002] Liquid-solid separation refers to the process of separating liquids and solid particles from a mixture. It has wide applications in many fields such as chemical engineering, food processing, pharmaceuticals, and environmental protection.

[0003] Currently, liquid-solid separation typically employs methods such as sedimentation, filtration, and centrifugation. These methods have low system throughput, require a large area, and have low separation accuracy and efficiency, resulting in unsatisfactory performance. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency and high-precision combined liquid-solid separation system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency and high-precision combined liquid-solid separation system, comprising a pretreatment system, a membrane separation system, and a slurry recovery system. The pretreatment system includes a liquid-solid micro-cyclone separator, in which the raw liquid is pumped into the liquid-solid micro-cyclone separator to remove solids and suspended matter. The membrane separation system includes a security filter and a membrane filter, in which the pretreated raw liquid is sequentially passed through the security filter and the membrane separator to remove impurities. The slurry recovery system is used to perform liquid-solid separation on the bottom residue of the liquid-solid micro-cyclone separator, the security filter, and the membrane filter.

[0006] Preferably, the pretreatment system further includes a raw liquid tank, the output end of which is connected to the input end of a solid-micro vortex separator, and the output end of the solid-micro vortex separator is connected to a filtrate tank.

[0007] Preferably, the membrane separation system further includes a regeneration waste liquid tank, a clear liquid tank, and a regeneration liquid tank. The output end of the membrane filter is connected to the input ends of the regeneration waste liquid tank and the clear liquid tank, respectively. The regeneration liquid tank and the regeneration liquid tank are connected by a circulation pump to circulate the cleaning liquid in the membrane separation system, so that the cleaning liquid can fully contact the membrane surface.

[0008] Preferably, the pure solution is exported from the output end of the clear liquid tank via a clear liquid pump.

[0009] Preferably, the output end of the filtrate tank is connected to the input end of the security filter via a filter feed pump.

[0010] Preferably, the slurry recovery system includes a centrifuge, and the bottom residue output ends of the liquid-solid microcyclone separator, the security filter, and the membrane filter are connected to the centrifuge input end, and the centrifuge output end is connected to the raw liquid tank input end.

[0011] The technical effects and advantages of this utility model are as follows: This high-efficiency and high-precision combined liquid-solid separation system uses liquid-solid micro-cyclone separation as the primary filtration stage to remove solid particles and suspended matter larger than 7~25μm, and secondary filtration to remove solid particles larger than 1μm, reducing the load on membrane filtration, thereby reducing the investment cost of membrane modules and increasing the service life of membranes, thus reducing operating costs. The membrane can be repeatedly cleaned and regenerated, with a service life of up to 3-4 years, reducing consumption costs. The membrane separation adopts a cross-flow operation mode, which can solve the problem of fouling and clogging, making cleaning convenient. It has high separation accuracy and efficiency, good separation effect, large system throughput, and small footprint, which can reduce investment in hardware facilities. Attached Figure Description

[0012] Figure 1 This is a process flow diagram of the present invention;

[0013] Figure 2 This is a schematic diagram of the membrane filter structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the liquid-solid micro-cyclone separator of this utility model.

[0015] In the diagram: 1. Liquid-solid micro-cyclone separator; 2. Raw material pump; 3. Security filter; 4. Membrane filter; 5. Raw material tank; 6. Filtrate tank; 7. Regenerated waste liquid tank; 8. Clarified liquid tank; 9. Regenerated liquid tank; 10. Circulation pump; 11. Clarified liquid pump; 12. Filter feed pump; 13. Centrifuge; 14. Upper partition of the first outer shell; 15. Lower partition of the first outer shell; 16. First shell; 17. Filter element; 18. Upper partition of the second outer shell; 19. Lower partition of the second outer shell; 20. Micro-cyclone separation core tube; 21. Second shell. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] refer to Figure 1As shown, the system includes a pretreatment system, a membrane separation system, and a slurry recovery system. The pretreatment system includes a liquid-solid microcyclone separator 1, where the raw liquid is pumped by a raw liquid pump 2 to remove solids and suspended solids. The membrane separation system includes a security filter 3 and a membrane filter 4, where the pretreated raw liquid is sequentially passed through the security filter 3 and the membrane separator to remove impurities. The slurry recovery system is used to perform liquid-solid separation on the bottom residue of the liquid-solid microcyclone separator, security filter 3, and membrane filter 4. The liquid-solid microcyclone separation, as a primary filtration stage, can remove solid particles and suspended solids larger than 7-25 μm, and the secondary filtration stage can remove particles larger than 1 μm. For solid particles larger than 1.5 μm, the membrane filtration load is reduced, thereby lowering the investment cost of membrane modules and extending the membrane's service life, thus reducing operating costs. The membrane can be repeatedly cleaned and regenerated, with a service life of 3-4 years, reducing consumption costs. The membrane separation adopts a cross-flow operation mode, which can solve the problem of fouling and clogging. It is easy to clean, has high separation accuracy and efficiency, and good separation effect. It is a purely physical process with no chemical reaction and no secondary pollution. The system has a large throughput and a small footprint, which can reduce investment in hardware facilities. The separation process has no phase change, low energy consumption, and meets the requirements of clean production with energy conservation and emission reduction. It has a high degree of automation, reducing labor intensity and labor costs.

[0018] refer to Figure 1 , Figure 2 and Figure 3As shown, the liquid-solid microcyclone separator relies on the density difference between the solid and liquid phases and utilizes the centrifugal force field generated by adjusting the rotating fluid to achieve solid-liquid separation. The particle size range of separation is generally 7~25μm, and the separation rate for particles >40µm reaches 98%. Solid-liquid membrane separation utilizes the principle of mechanical sieving, using a certain pressure difference across the membrane as the driving force, and employs a cross-flow filtration method. It achieves solid-liquid separation or separation of molecules of different molecular weights based on the size, shape, conformation, and polarity of the material molecules. The core of membrane separation is the membrane itself. The membrane is a semi-permeable membrane of a polymer material with special selective separation function, meaning it can allow one substance to pass through while blocking another. The precision of the liquid-solid separation membrane mainly depends on its pore size and filtration performance. The precision of the liquid-solid separation membrane is usually expressed by pore size, with common precision ranges from nanometers to micrometers. The output end of the clarified liquid tank 8 discharges pure solution through the clarified liquid pump 11. The output end of the filtrate tank 6 is connected to the input end of the security filter 3 through the filter feed pump 12. The membrane separation system also includes a waste regeneration tank 7, a clear liquid tank 8, and a regeneration liquid tank 9. The output end of the membrane filter 4 is connected to the input ends of the waste regeneration tank 7 and the clear liquid tank 8, respectively. The regeneration liquid tank 9 and the regeneration liquid tank 8 are connected by a circulation pump 10 to circulate the cleaning solution in the membrane separation system, allowing the cleaning solution to fully contact the membrane surface. For example, the pore size of a nanoscale liquid-solid separation membrane is between 0.1 nanometers and 100 nanometers, while the pore size of a micrometer-scale liquid-solid separation membrane is between 0.1 micrometers and 1000 micrometers. The raw liquid enters the raw liquid tank 5, is pumped by the raw liquid pump 2 into the liquid-solid micro-cyclone separator 1, and then enters the micro-cyclone separator 1 tangentially, where the liquid generates a strong rotational motion. During rotation, solid particles of different densities and sizes are subjected to different centrifugal forces. Heavier solid particles, due to the greater centrifugal force, are pushed towards the outer wall of the hydrocyclone separator and descend along the wall, eventually settling at the bottom to form a concentrated layer. Lighter particles, on the other hand, are closer to the central axis area and are discharged through the top. Here, solids and suspended matter of ≥40µm and some 7~25µm can be removed. The primary filtrate enters the filtrate tank 6. The primary filtrate is pressurized by the filter feed pump 12 and enters the security filter 3 for secondary filtration to remove solid particles ≥1µm from the primary filtrate, thereby improving the efficiency of membrane separation and reducing membrane investment. The secondary filtrate enters the membrane separator. In the membrane separator, under pressure, solid particles larger than the membrane pore size are intercepted on the surface of the filter element 17. The clean fluid quickly passes through the filter element 17, through the clear liquid chamber, and then exits the filter into the clear liquid tank 8.As the number of particles trapped on the surface of filter element 17 increases, the filter cake layer thickness increases. Filtration through the filter cake layer allows even finer particles to be intercepted on the outer surface of filter element 17. With prolonged filtration time, the filter cake layer thickens, increasing the resistance of fluid flowing through the filtration channels of filter element 17 and increasing the pressure difference across filter element 17. Periodic discharge of sludge from the bottom of the filter creates a reverse pressure difference between the inner and outer surfaces of filter element 17, causing the filter cake layer to detach and restore its performance. Simultaneously, the membrane can efficiently trap and remove large molecular organic matter, bacteria, viruses, etc., resulting in near-zero turbidity effluent. The first stage is chemical cleaning. Specific chemical agents are used, and the cleaning solution is circulated in the reverse osmosis membrane system via circulation pump 10, ensuring thorough contact between the cleaning solution and the membrane surface to dissolve and remove dirt, colloids, microorganisms, and other impurities. This process typically lasts for several hours or even longer to ensure thorough cleaning. After cleaning, a rinsing step is performed. The membrane system is rinsed with plenty of clean water to remove residual chemicals and impurities generated during the cleaning process, preventing secondary contamination of the membrane. This rinsing process typically takes several hours to several days, until the conductivity and other parameters of the rinse water return to normal levels. Next comes the soaking treatment. After rinsing, the membrane is soaked in a specific protective solution to prevent oxidation and microbial growth during storage. The soaking time is generally 24-48 hours to fully protect the membrane's performance. The bottom residue from the liquid-solid microcyclone separator, security filter 3, and membrane filter 4 enters the centrifuge 13 for liquid-solid separation. The clarified liquid returns to the original liquid tank 5, while the solids are sent to the next processing step. The membrane filter 4 includes a first housing 16, within which are a first upper outer shell partition 14 and a first lower outer shell partition 15. A filter element 17 is disposed between the first upper outer shell partition 14 and the first lower outer shell partition 15. A secondary filtrate inlet is located on the left side of the first housing 16, a clarified liquid outlet is located on the right side, and a residue outlet is located at the bottom. The liquid-solid micro-cyclone separator includes a second housing 21, inside which are a second outer shell upper partition 18 and a second outer shell lower partition 19. A micro-cyclone separation core tube 20 is disposed between the second outer shell upper partition 18 and the second outer shell lower partition 19. A raw liquid inlet is disposed on the left side of the second housing 21, a filtrate outlet is disposed on the top, and a residue outlet is disposed on the bottom.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A high-efficiency, high-precision combined liquid-solid separation system, characterized in that, The system includes a pretreatment system, a membrane separation system, and a slurry recovery system. The pretreatment system includes a liquid-solid microcyclone separator (1). The raw liquid enters the liquid-solid microcyclone separator (1) through a raw liquid pump (2) to remove solids and suspended matter. The membrane separation system includes a security filter (3) and a membrane filter (4). The raw liquid after pretreatment passes through the security filter (3) and the membrane separator in sequence to remove impurities. The slurry recovery system is used to separate the bottom residue of the liquid-solid microcyclone separator, the security filter (3), and the membrane filter (4) into liquid and solid components.

2. The high-efficiency, high-precision combined liquid-solid separation system according to claim 1, characterized in that: The pretreatment system also includes a raw liquid tank (5), the output end of which is connected to the input end of a solid-micro vortex separator, and the output end of the solid-micro vortex separator is connected to a filter tank (6).

3. The high-efficiency, high-precision combined liquid-solid separation system according to claim 1, characterized in that: The membrane separation system also includes a waste liquid tank (7), a clear liquid tank (8), and a regenerated liquid tank (9). The output end of the membrane filter (4) is connected to the input ends of the waste liquid tank (7) and the clear liquid tank (8), respectively. The regenerated liquid tank (9) and the regenerated liquid tank (9) circulate the cleaning liquid in the membrane separation system through a circulation pump (10) so that the cleaning liquid can fully contact the membrane surface.

4. The high-efficiency, high-precision combined liquid-solid separation system according to claim 3, characterized in that: The pure solution is discharged from the output end of the clear liquid tank (8) through the clear liquid pump (11).

5. The high-efficiency, high-precision combined liquid-solid separation system according to claim 2, characterized in that: The output end of the filtrate tank (6) is connected to the input end of the security filter (3) through the filter feed pump (12).

6. The high-efficiency, high-precision combined liquid-solid separation system according to claim 2, characterized in that: The slurry recovery system includes a centrifuge (13), the bottom residue output ends of the liquid-solid micro-cyclone separator, the security filter (3) and the membrane filter (4) are connected to the input end of the centrifuge (13), and the output end of the centrifuge (13) is connected to the input end of the raw liquid tank (5).

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