Wiped film evaporator for purification of lithium ion battery negative electrode coating material

Abstract

The utility model relates to a wiped film evaporator for lithium ion battery negative pole coating material purification, belong to the technical field of purification evaporation equipment, including evaporation cylinder, heating jacket, feed pipe, scraping material axle, scrape membrane device, collection baffle, heavy component discharge pipe, light component discharge pipe, separate cylinder, the inside lower part of separate cylinder is equipped with cloth liquid lower end, cloth liquid lower end all uniformly has a plurality of condenser pipes fixed, the top of condenser pipe is fixed with reflux end, the middle of reflux end is fixed with reflux pipe, the lower end of reflux pipe is connected with refrigerant outlet pipe, the middle bottom of cloth liquid lower end is fixed with refrigerant inlet pipe, the evaporation cylinder below collection baffle is equipped with vacuumizing pipe. The utility model discloses a vacuumizing pipe is set up, the noncondensable gas in the evaporator is continuously taken away, thereby reduced operating temperature, improved purification efficiency, the gas of taking out passes through cloth liquid lower end and condenser pipe, reduces the direct taking out discharge of not condensing gas.

Description

Technical Field

[0001] This utility model belongs to the technical field of purification and evaporation equipment, specifically relating to a scraped film evaporator for purifying lithium-ion battery anode coating materials. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage technologies, and other fields, the demand for lithium-ion batteries is constantly increasing. Among these, the anode material, as a key component of lithium-ion batteries, directly affects the overall performance of the battery. Therefore, developing high-performance lithium-ion battery anode materials has become a current research hotspot.

[0003] In the preparation of lithium-ion battery anode materials, the use of coating materials can effectively improve the electrochemical performance of the anode materials. Ethylene tar, as an important chemical raw material, can be converted into high-softening-point coating materials for lithium-ion battery anodes through specific chemical reactions of its heavy oil components. However, in the preparation of coating materials, the products often contain multiple components, requiring effective purification to obtain high-quality products. Traditional product purification methods, such as crystallization and extraction, while achieving component separation to some extent, often suffer from problems such as complex operation, high energy consumption, and insufficient product purity. Therefore, developing an efficient, energy-saving, and environmentally friendly product purification technology is of great significance for improving the quality of coating materials for lithium-ion battery anodes.

[0004] As a highly efficient evaporation device, the scraped-film evaporator has advantages such as high heat transfer efficiency, simple operation, and low energy consumption, and is widely used in material separation and purification in chemical, pharmaceutical and other fields. However, when traditional scraped-film evaporators are used for the purification of coating materials for lithium-ion battery anodes, they often suffer from high operating temperatures, low purification efficiency, and difficulty in recovering light components. Utility Model Content

[0005] Therefore, it is necessary to provide a scraped film evaporator for purifying lithium-ion battery anode coating materials, addressing the existing technical problems.

[0006] To solve the problems of the existing technology, the technical solution adopted by this utility model is as follows: A scraped-film evaporator for purifying lithium-ion battery anode coating materials includes an evaporation cylinder, a heating jacket, a feed pipe, and a scraper shaft. The scraper shaft is connected to a scraping device. A collection baffle is fixed at the bottom of the evaporation cylinder. A heavy component discharge pipe is provided on the lower side wall of the evaporation cylinder, and a light component discharge pipe is provided at the bottom of the evaporation cylinder. A separator cylinder is fixed in the middle of the collection baffle, and the bottom of the separator cylinder extends to the lower part of the evaporation cylinder. A liquid distribution lower end is provided in the lower part of the separator cylinder. Multiple condenser tubes are evenly fixed on the liquid distribution lower end. A reflux end is fixed at the top of the condenser tubes, and a reflux pipe is fixed in the middle of the reflux end. A refrigerant outlet pipe is connected to the lower end of the reflux pipe. A refrigerant inlet pipe is fixed at the bottom middle of the liquid distribution lower end. A vacuum pipe is provided on the evaporation cylinder below the collection baffle.

[0007] As a preferred embodiment, an orifice plate is fixed inside the lower end of the liquid distribution head, and the condenser tubes are fixed in the mounting holes of the orifice plate. A sealing plate is fixed to the top of the lower end of the liquid distribution head, and a liquid outlet chamber is formed between the sealing plate and the orifice plate. The lower end of the return pipe is fixed to the sealing plate and connects to the liquid outlet chamber, and the refrigerant outlet pipe connects to the liquid outlet chamber. The tops of both the sealing plate and the return end are spherical. The orifice plate provides precise positioning and fixation for the condenser tubes, ensuring uniform distribution of the condenser tubes; the liquid outlet chamber provides a flow channel for the refrigerant, ensuring smooth refrigerant circulation; and the spherical tops prevent condensate residue.

[0008] As a preferred embodiment, the collecting baffle is inclined, and the heavy component discharge pipe is located on the evaporation cylinder above the lower end of the collecting baffle, while the top of the separator cylinder is higher than the higher end of the collecting baffle. The inclined collecting baffle uses gravity to guide the heavy components to flow towards the discharge port, improving the smoothness of the heavy component discharge; the height design of the top of the separator cylinder can effectively prevent heavy components from entering the light component area, ensuring separation purity.

[0009] As a preferred embodiment, the scraping device includes multiple support rings arranged vertically and coaxial with the scraping shaft. Multiple fixing plates are fixed to the inner wall of the uppermost support ring, with the inner ends of the fixing plates fixed to the scraping shaft. The multiple support rings are fixedly connected by multiple evenly distributed fixing rods. Each pair of adjacent support rings has at least two sets of scraper assemblies on its outer wall, and adjacent scraper assemblies are not in the same vertical plane. The multiple sets of support rings are connected by fixing rods to form a stable frame. The fixing plates ensure that the scraping device rotates synchronously with the scraping shaft. The staggered distribution of adjacent scraper assemblies allows for multi-layer, all-around scraping of the material, avoiding dead zones and ensuring the uniformity of the liquid film.

[0010] As a preferred embodiment, the outer wall of the support ring is provided with a mounting groove. The scraper assembly includes a U-shaped plate welded and fixed in the mounting groove, and a detachable ceramic scraper plate is fixed inside the U-shaped plate by bolts. The cooperation between the mounting groove and the U-shaped plate ensures the stable installation of the scraper assembly, and the bolt connection makes it easy to disassemble and replace the ceramic scraper plate, reducing maintenance costs. The ceramic material has wear-resistant and high-temperature resistant properties, extending the service life of the scraper.

[0011] As a preferred embodiment, the inner wall of the U-shaped plate is fixed with limiting flanges on both the top and bottom, and the limiting flanges are tightly attached to the support ring. The limiting flanges further enhance the connection stability between the U-shaped plate and the support ring, and can quickly perform height positioning.

[0012] As a preferred embodiment, a distribution cone is fixed on the scraper shaft above the film-scraping device. The top of the distribution cone has an annular slot, inside which an overflow cylinder is fixed. A drain hole is located at the lower part of the overflow cylinder, corresponding to the top of the distribution cone. The inner end of the feed pipe has a feed bend that feeds material towards the overflow cylinder. The feed bend feeds material to the overflow cylinder, which then overflows evenly around the perimeter, ensuring uniform distribution of the material onto the distribution cone. The cone-shaped structure of the distribution cone utilizes gravity and centrifugal force to evenly spread the material radially, laying a good foundation for subsequent film formation. The drain hole, combined with the structure at the top of the distribution cone, allows for complete drainage of liquid from the overflow cylinder.

[0013] The advantages of this utility model compared with the prior art are: By setting up a vacuum tube, non-condensable gases in the evaporator are continuously removed, thereby reducing the operating temperature and improving the purification efficiency.

[0014] The scraping device inside the scraped film evaporator evenly distributes the material, enhances the heat and mass transfer process, effectively prevents the material from coking and scaling inside the evaporator, and ensures continuous and stable operation.

[0015] The light components removed by evaporation are recovered by condensation to obtain rubber additives as a byproduct, achieving efficient utilization of resources and reducing production costs. In addition, multiple condenser tubes are uniformly fixed at the lower end of the liquid distribution tube, which can increase the condensation effect.

[0016] In addition, the vacuum tube is installed on the evaporation cylinder below the collecting baffle. The extracted gas passes through the lower end of the liquid distribution tube and the condenser tube, reducing the direct extraction and discharge of gas that has not been condensed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Partial structural diagram Figure 1 ; Figure 3 yes Figure 1 Partial structural diagram Figure 2 ; Figure 4 This is a schematic diagram of the top structure of the support ring; The numbers on the map are: 1. Scraper shaft; 2. Feed pipe; 3. Evaporator cylinder; 4. Distribution cone; 5. Overflow cylinder; 6. Fixing plate; 7. Fixing rod; 8. Heating jacket; 9. Ceramic scraper plate; 10. Support ring; 11. U-shaped plate; 12. Condenser; 13. Separator cylinder; 14. Return pipe; 15. Heavy component discharge pipe; 16. Collection baffle; 17. Vacuum pipe; 18. Refrigerant inlet pipe; 19. Light component discharge pipe; 20. Liquid distribution lower end; 21. Orifice plate; 22. Sealing plate; 23. Refrigerant outlet pipe; 24. Return end; 25. Drain hole; 26. Limiting flange. Detailed Implementation

[0018] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] Example 1, Reference Figures 1 to 4 A scraped-film evaporator for purifying lithium-ion battery negative electrode coating materials includes an evaporation cylinder 3, a heating jacket 8, a feed pipe 2, and a scraper shaft 1. The scraper shaft 1 is connected to a scraping device. A collection baffle 16 is fixed at the lower part of the evaporation cylinder 3. A heavy component discharge pipe 15 is provided on the lower side wall of the evaporation cylinder 3. A light component discharge pipe 19 is provided at the bottom of the evaporation cylinder 3. A separator cylinder 13 is fixed in the middle of the collection baffle 16. The bottom of the separator cylinder 13 extends to the lower part of the evaporation cylinder 3. A liquid distribution lower end 20 is provided in the lower part of the separator cylinder 13. Multiple condenser tubes 12 are evenly fixed on the liquid distribution lower end 20. A reflux end 24 is fixed at the top of the condenser tubes 12. A reflux pipe 14 is fixed in the middle of the reflux end 24. A refrigerant outlet pipe 23 is connected to the lower end of the reflux pipe 14. A refrigerant inlet pipe 18 is fixed at the bottom middle of the liquid distribution lower end 20. A vacuum pipe 17 is provided on the evaporation cylinder 3 below the collection baffle 16.

[0020] During operation, the crude product asphalt material after reaction enters the evaporation cylinder 3 through the feed pipe 2 and is then distributed on the inner wall of the evaporation cylinder 3. The scraper shaft 1 drives the scraping film device to rotate, and the scraping film device scrapes the material into a uniform liquid film on the inner wall of the evaporation cylinder 3. The heating jacket 8 heats the evaporation cylinder 3, and at the same time, the vacuum pipe 17 creates a vacuum inside the evaporation cylinder 3. The light components in the material evaporate under the action of heating and vacuum. During the rising process of the evaporated light components, they encounter the condenser pipe 12 and condense into liquid under the action of the refrigerant. The liquid flows down along the condenser pipe 12 and is discharged from the light component outlet pipe 19 at the bottom of the evaporation cylinder 3. The gas extracted by the vacuum pipe 17 passes through the lower end of the liquid distribution pipe 20 and the area of ​​the condenser pipe 12, reducing the direct extraction and discharge of uncondensed gas. The heavy components in the material flow down along the inner wall of the evaporation cylinder 3 under the action of gravity, fall onto the collection baffle 16, and are then discharged from the heavy component outlet pipe 15, completing the purification process.

[0021] In Example 2, based on Example 1, an orifice plate 21 is fixed inside the lower liquid distribution end 20, and the condenser tube 12 is fixed in the mounting hole of the orifice plate 21. A sealing plate 22 is fixed to the top of the lower liquid distribution end 20, and the space between the sealing plate 22 and the orifice plate 21 forms the liquid outlet cavity. The lower end of the return pipe 14 is fixed to the sealing plate 22 and connects to the liquid outlet cavity. The refrigerant outlet pipe 23 connects to the liquid outlet cavity. The tops of the sealing plate 22 and the return end 24 are both spherical. The refrigerant is medium-temperature heat transfer oil with an inlet temperature of about 120°C, an outlet temperature of less than 140°C, and an inlet pressure of about 0.3 MPa. The refrigerant entering through the refrigerant inlet pipe 18 is evenly distributed in the condenser tube 12 through the lower liquid distribution end 20, then flows upward into the return end 24, flows down from the return pipe 14 into the liquid outlet cavity, and is then discharged from the refrigerant outlet pipe 23.

[0022] The collecting baffle 16 is inclined, and the recombining discharge pipe 15 is located on the evaporation cylinder 3 above the lower end of the collecting baffle 16. The top of the separator cylinder 13 is higher than the higher end of the collecting baffle 16. A temperature sensor is installed inside the evaporation cylinder 3. The heating jacket 8 uses high-temperature heat transfer oil, with a maximum inlet temperature of 340℃, an outlet temperature greater than 325℃, and an inlet pressure of approximately 0.3MPa. Each unit is equipped with a tail gas condenser for condensing and cooling the vacuum tail gas. The vacuum pipe 17 connects to the vacuum system.

[0023] The scraping device includes multiple support rings 10 arranged vertically and coaxial with the scraping shaft 1. The inner wall of the uppermost support ring 10 is fixed with multiple fixing plates 6, while the inner walls of the other support rings 10 are not fixed with fixing plates 6. The inner ends of the fixing plates 6 are fixed to the scraping shaft 1. The multiple support rings 10 are fixedly connected by multiple evenly distributed fixing rods 7. The outer walls of two adjacent support rings 10 are provided with no less than two sets of scraper assemblies. The adjacent scraper assemblies in the vertical direction are not in the same vertical plane.

[0024] The outer wall of the support ring 10 is provided with a mounting slot. The scraper assembly includes a U-shaped plate 11 welded and fixed in the mounting slot. A detachable ceramic scraper plate 9 is fixed in the U-shaped plate 11 by bolts.

[0025] The inner sidewall of the U-shaped plate 11 is fixed with limiting flanges 26 at both the top and bottom, and the limiting flanges 26 are tightly attached to the support ring 10. When installing the U-shaped plate 11, the U-shaped plate 11 is inserted into the mounting slot, and the upper and lower limiting flanges 26 are tightly attached to the support ring 10. Then the U-shaped plate 11 is welded and fixed. Then the ceramic scraper plate 9 can be fixed in the U-shaped mounting groove of the U-shaped plate 11 with bolts.

[0026] A distribution cone 4 is fixed on the scraping shaft 1 above the scraping device. The top of the distribution cone 4 is provided with an annular slot, and an overflow cylinder 5 is fixed in the annular slot. A drain hole 25 is provided at the lower part of the overflow cylinder 5 corresponding to the top of the distribution cone 4. The inner end of the feed pipe 2 is provided with a feed bend that feeds towards the overflow cylinder 5. The material to be purified enters the overflow cylinder 5 through the feed bend of the feed pipe 2. The feed rate of the feed pipe 2 is greater than the discharge rate of the drain hole 25. When the overflow cylinder 5 is full, it will overflow from the top onto the distribution cone 4. Under the action of the distribution cone 4, it is evenly distributed on the inner wall of the evaporation cylinder 3. When the feed pipe 2 is not feeding, the drain hole 25 can drain the liquid material in the overflow cylinder 5.

[0027] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A scraped-film evaporator for purifying lithium-ion battery negative electrode coating materials, comprising an evaporation cylinder (3), a heating jacket (8), a feed pipe (2), and a scraper shaft (1), wherein the scraper shaft (1) is connected to a scraping device, a collecting baffle (16) is fixed at the lower part of the evaporation cylinder (3), a heavy component discharge pipe (15) is provided on the lower side wall of the evaporation cylinder (3), and a light component discharge pipe (19) is provided at the bottom of the evaporation cylinder (3), characterized in that: A separator (13) is fixed in the middle of the collecting baffle (16). The bottom of the separator (13) extends to the lower part of the evaporating cylinder (3). A liquid distribution lower end (20) is provided in the lower part of the separator (13). Multiple condensing tubes (12) are evenly fixed on the liquid distribution lower end (20). A return end (24) is fixed at the top of the condensing tube (12). A return pipe (14) is fixed in the middle of the return end (24). A refrigerant outlet pipe (23) is connected to the lower end of the return pipe (14). A refrigerant inlet pipe (18) is fixed at the bottom of the middle of the liquid distribution lower end (20). A vacuum pipe (17) is provided on the evaporating cylinder (3) below the collecting baffle (16).

2. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 1, characterized in that, A perforated plate (21) is fixed inside the liquid distribution lower end (20), and a condenser tube (12) is fixed in the mounting hole of the perforated plate (21). A sealing plate (22) is fixed on the top of the liquid distribution lower end (20). The liquid outlet cavity is between the sealing plate (22) and the perforated plate (21). The lower end of the return pipe (14) is fixed on the sealing plate (22) and connected to the liquid outlet cavity. The refrigerant outlet pipe (23) is connected to the liquid outlet cavity. The tops of the sealing plate (22) and the return end (24) are both spherical.

3. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 1, characterized in that, The collecting baffle (16) is set at an angle, and the recombining discharge pipe (15) is set on the evaporation cylinder (3) above the lower end of the collecting baffle (16). The top of the separator cylinder (13) is higher than the higher end of the collecting baffle (16).

4. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 1, characterized in that, The scraping device includes multiple support rings (10) arranged vertically and coaxial with the scraping shaft (1). Multiple fixing plates (6) are fixed on the inner wall of the uppermost support ring (10). The inner end of the fixing plate (6) is fixed to the scraping shaft (1). The multiple support rings (10) are fixedly connected by multiple evenly distributed fixing rods (7). At least two sets of scraper assemblies are provided on the outer walls of two adjacent support rings (10). The adjacent scraper assemblies in the vertical direction are not in the same vertical plane.

5. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 4, characterized in that, The outer wall of the support ring (10) is provided with a mounting slot, and the scraper assembly includes a U-shaped plate (11) welded and fixed in the mounting slot. A detachable ceramic scraper plate (9) is fixed in the U-shaped plate (11) by bolts.

6. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 5, characterized in that, The inner sidewall of the U-shaped plate (11) is fixed with limiting flanges (26) on both the top and bottom, and the limiting flanges (26) are closely attached to the support ring (10).

7. The scraped-film evaporator for purifying lithium-ion battery anode coating materials according to claim 1, characterized in that, A distribution cone disk (4) is fixed on the scraper shaft (1) above the scraper device. The top of the distribution cone disk (4) is provided with an annular slot. An overflow cylinder (5) is fixed inside the annular slot. A drain hole (25) is provided at the lower part of the overflow cylinder (5) corresponding to the top surface of the distribution cone disk (4). The inner end of the feed pipe (2) is provided with a feed bend that feeds towards the overflow cylinder (5).

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