A new type of wiped film evaporator

Abstract

The application relates to a novel scraper film evaporator, which comprises a cylinder body provided with a reaction cavity, a feeding port is formed in the side wall of the cylinder body, a discharging port is formed in the bottom wall of the cylinder body, a steam outlet is formed in the upper side of the cylinder body, and the scraper film evaporator further comprises a gas-liquid separation structure, the gas-liquid separation structure comprises two mist eliminators, a rotating shaft is coaxially and rotationally connected in the reaction cavity, the two mist eliminators are coaxially and fixedly connected on the rotating shaft, and are located below the steam outlet, the two mist eliminators are in the shape of a conical cylinder, the two mist eliminators are oppositely arranged at the ends with smaller diameters, and a plurality of through holes are uniformly distributed on the side walls of the two mist eliminators. The lower mist eliminator can first intercept liquid droplets or foams ascending with secondary steam, and the upper mist eliminator further intercepts residual liquid. The through holes in the side walls of the mist eliminators can ensure the smooth ascending and discharging of the secondary steam, and can block the liquid droplets from passing through, so that the steam flow efficiency and the separation effect are balanced, the liquid-carrying condition of the secondary steam is reduced, and the possibility of low product purity and material waste is reduced.

Description

Technical Field

[0001] This utility model relates to the field of evaporator technology, and in particular to a novel scraped film evaporator. Background Technology

[0002] The core function of a thin-film evaporator is to efficiently separate light and heavy components from liquid materials for concentration, solvent recovery, or purification. It allows the material to form a thin liquid film of 0.1-1 mm, increasing the heat transfer area and enabling rapid film renewal. Combined with a vacuum low-temperature environment, the material resides for only a few seconds to tens of seconds, protecting heat-sensitive components. It can also handle difficult-to-process materials such as high-viscosity and easily foaming materials, and is widely used in chemical, pharmaceutical, and food industries.

[0003] Existing secondary steam separation technologies are mostly simple primary separations, such as built-in simple filters and baffles; secondary steam is prone to carrying a large number of liquid droplets, causing material to be lost with the steam and increasing production costs. Utility Model Content

[0004] To reduce the problems of low product purity and material waste caused by secondary steam carrying liquid, this application provides a novel scraped film evaporator.

[0005] The novel scraped-film evaporator provided in this application adopts the following technical solution: A novel scraped-film evaporator includes a cylindrical body with a reaction chamber. The cylindrical body has a feed inlet on its side wall, a discharge outlet on its bottom wall, and a steam outlet on its upper side. It also includes a gas-liquid separation structure comprising two demisters. A rotating shaft is coaxially rotatably connected within the reaction chamber. The two demisters are coaxially and fixedly connected to the rotating shaft and located below the steam outlet. The two demisters are conical cylindrical structures, with their smaller diameter ends facing each other. Multiple through holes are evenly distributed on the side walls of the two demisters.

[0006] By adopting the above technical solution, the lower demister can first intercept droplets or foam rising with the secondary steam; the upper demister further intercepts the remaining liquid, forming a "double interception" effect. The through holes on the side wall of the demister can both ensure that the secondary steam rises and is discharged smoothly, and block droplets from passing through, balancing the steam flow efficiency and separation effect, reducing the liquid carryover in the secondary steam, thereby reducing the possibility of low product purity and material waste.

[0007] Preferably, the larger diameter of the upper mist trap is larger than the larger diameter of the lower mist trap, and the smaller diameter of the upper mist trap is larger than the smaller diameter of the lower mist trap, forming an upper and lower gradient conical structure.

[0008] By adopting the above technical solutions, the gas-liquid separation path is optimized, the interception coverage at different heights is improved, and the liquid carryover rate is further reduced.

[0009] Preferably, the gas-liquid separation structure further includes two sets of defoaming blades, each set of defoaming blades corresponding to two mist eliminators. Each set of defoaming blades includes multiple inclined blades, which are evenly arranged on the circumferential side of the rotating shaft, and the ends of the multiple inclined blades away from the rotating shaft are fixedly connected to the mist eliminator.

[0010] By adopting the above technical solution, when the oblique blades rotate with the shaft, they can directly disperse the foam formed in the secondary steam, avoiding the foam from carrying a large number of liquid droplets through the demister, reducing the liquid carryover in the secondary steam, and thus reducing the possibility of low product purity and material waste.

[0011] Preferably, it also includes a feeder, which is coaxially and fixedly connected to the rotating shaft and located below the feed inlet. The feeder is flared, and the end with a larger diameter is farther from the feed inlet than the end with a smaller diameter.

[0012] By adopting the above technical solutions, uniform film formation of materials can be achieved, the impact of entrained gas on evaporation can be reduced, and evaporation efficiency can be improved.

[0013] Preferably, it also includes multiple scrapers, and a rotating frame is coaxially arranged on the rotating shaft. The multiple scrapers are rotatably connected to the rotating frame along the axial direction of the rotating shaft. When the scraper rotates to the limit position towards the side wall of the reaction chamber, the scraper abuts against the side wall of the reaction chamber.

[0014] By adopting the above technical solution, the scraper can rotate with the rotating frame, and at the same time, adaptive adjustment can be achieved through the rotating connection. Even when processing high-viscosity materials, it can stick to the cylinder wall under the action of centrifugal force, scrape the material into an extremely thin liquid film, and improve the evaporation rate.

[0015] Preferably, the rotating frame is hinged to multiple hinge frames, which are evenly distributed around the circumference of the rotating frame. Each of the multiple hinge frames corresponds to a multiple scraper, and each of the multiple scrapers is detachably connected to its corresponding hinge frame.

[0016] By adopting the above technical solutions, the rotation characteristics of the articulated frame can help the scraper adapt to the curvature of the cylinder wall, and the limiting structure further ensures the scraper's wall adhesion effect; the detachable connection design allows for quick replacement of different types of scrapers to meet the evaporation needs of materials with different viscosities and forms, and improves the equipment's versatility and maintenance convenience.

[0017] Preferably, the end of the reaction chamber near the discharge port is the discharge end, and the discharge end is gradually narrowed from the side away from the discharge port to the side near the discharge port. The bottom of the rotating shaft is provided with a spiral ribbon agitator, which is located at the discharge end.

[0018] By adopting the above technical solution, when the ribbon mixer rotates with the shaft, it can drive the material in the discharge end to turn up and down, break up the material sedimentation, accelerate the discharge of the concentrate from the discharge port, and avoid the material remaining and deteriorating at the discharge end.

[0019] The main technical effects of this utility model are reflected in the following aspects: 1. This utility model, through the setting of a gas-liquid separation structure, allows the lower demister to first intercept droplets or foam rising with the secondary steam; the upper demister further intercepts the remaining liquid, forming a "double interception" effect. The through holes on the side wall of the demister can both ensure the smooth rise and discharge of the secondary steam and block the passage of droplets, balancing the steam flow efficiency and separation effect, reducing the liquid carryover in the secondary steam, thereby reducing the possibility of low product purity and material waste; 2. By setting up inclined blades, the inclined blades can directly disperse the foam formed in the secondary steam when rotating with the shaft, avoiding the foam from carrying a large number of liquid droplets through the demister, reducing the liquid carryover in the secondary steam, and thus reducing the possibility of low product purity and material waste. 3. This utility model achieves uniform film formation of materials by setting a funnel-shaped material distributor, reducing the impact of entrained gas on evaporation, and improving evaporation efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0021] Figure 2 It is along Figure 1 Enlarged view of point A in the middle.

[0022] Figure 3 It is along Figure 1 Enlarged view of point B in the middle.

[0023] Figure 4 It is along Figure 1 A sectional view of CC.

[0024] Figure 5 This is a schematic diagram of the gas-liquid separation structure in an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Cylinder; 111. Reaction chamber; 2. Feed inlet; 3. Discharge outlet; 4. Steam outlet; 5. Motor; 6. Rotating shaft; 7. Gas-liquid separation structure; 8. Foam eliminator; 9. Defoaming blade; 91. Inclined blade; 10. Distributor; 11. Rotating frame; 12. Hinge frame; 13. Scraper; 14. Bolt; 15. Discharge end; 16. Ribbon agitator; 17. Jacket. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-5This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0027] This application discloses a novel scraped-film evaporator.

[0028] Reference Figure 1 This embodiment of a novel scraped-film evaporator includes a cylindrical body 1 with a reaction chamber 111 and a jacket 17. A feed inlet 2 is provided on the side wall of the cylindrical body 1, tangentially positioned to the side wall of the reaction chamber 111. A discharge outlet 3 is provided on the bottom wall, and a steam outlet 4 is provided on the upper side. A motor 5 is mounted on the cylindrical body 1, and a rotating shaft 6 is coaxially rotatably connected within the reaction chamber 111. The motor 5 drives the rotation of the rotating shaft 6.

[0029] Reference Figure 2 and Figure 5 It also includes a gas-liquid separation structure 7, which includes two mist traps 8. The two mist traps 8 are coaxial and fixedly connected to the rotating shaft 6. The two mist traps 8 are conical cylindrical structures. The smaller diameter ends of the two mist traps 8 are arranged opposite each other. The larger diameter of the upper mist trap 8 is larger than that of the lower mist trap 8, and the smaller diameter of the upper mist trap 8 is larger than that of the lower mist trap 8, forming an upper and lower gradient conical structure. Multiple through holes are evenly distributed on the side walls of the two mist traps 8.

[0030] Reference Figure 2 and Figure 5 The gas-liquid separation structure 7 also includes two sets of defoaming blades 9, which correspond to two mist eliminators 8 respectively. Each set of defoaming blades 9 includes multiple inclined blades 91, which are evenly arranged on the circumferential side of the rotating shaft 6, and the ends of the multiple inclined blades 91 away from the rotating shaft 6 are fixedly connected to the mist eliminator 8.

[0031] Reference Figure 2 and Figure 5 The gas-liquid separation structure 7 designs two demisters 8 as upper and lower cones with an inclined defoaming blade 9. The most significant feature of this design is that when the gas rises to the gas-liquid separation structure 7, it encounters the lower demister 8, which is a positive cone shape, and can deflect a large amount of liquid droplets in the gas back into the evaporator. The liquid carried in the gas on the outer and inner sides can be deflected back into the evaporator by the upper inverted cone demister 8 and the middle inclined defoaming blade 9, thereby achieving gas-liquid separation and improving product quality.

[0032] Reference Figure 1 It also includes a feeder 10, which is coaxially and fixedly connected to the rotating shaft 6 and located below the feed inlet 2. The feeder 10 is flared, and the end with a larger diameter is farther from the feed inlet 2 than the end with a smaller diameter. A 3mm gap is left between the outer diameter of the larger end and the side wall of the reaction chamber 111.

[0033] Reference Figure 1 The material feeder 10 is designed in a funnel shape, with the outer diameter of the large opening 3mm away from the evaporator cylinder wall. This allows the material to flow better onto the surface of the evaporator cylinder wall. The material enters the outside of the material feeder 10 tangentially, and the rotation of the shaft drives the material feeder 10 to continuously and evenly coat the material into a film. Another function of the funnel shape is to remove liquid carried in the gas.

[0034] Reference Figure 3 and Figure 4 It also includes multiple scrapers 13. A rotating frame 11 is coaxially fixedly connected to the rotating shaft 6. The multiple scrapers 13 are rotatably connected to the rotating frame 11 along the axial direction of the rotating shaft 6. That is, multiple hinge frames 12 are hingedly connected to the rotating frame 11. The multiple hinge frames 12 are evenly distributed around the circumference of the rotating frame 11. The multiple hinge frames 12 correspond to the multiple scrapers 13. The multiple scrapers 13 are detachably connected to the corresponding hinge frames 12 by bolts 14. When the scraper 13 rotates to the limit position towards the side wall of the reaction chamber 111, the scraper 13 abuts against the side wall of the reaction chamber 111.

[0035] Reference Figure 3 and Figure 4 The scraper 13 is designed as a rotating scraper 13 device with a limiting function. Its key feature is that the rotor is equipped with a rotating scraper 13 device with a limiting function. This structure's advantage lies in employing a rotating scraper 13 device with a limiting function, enabling the rotary thin-film evaporator to complete the evaporation process at high speed, high efficiency, and reliable performance even with high-viscosity materials. The detachable connection design allows for quick replacement of different types of scrapers 13 to meet the evaporation needs of materials with different viscosities and forms, improving equipment versatility and maintenance convenience.

[0036] Reference Figure 1 The end of the reaction chamber 111 near the discharge port 3 is the discharge end 15. The discharge end 15 is set in a gradually narrowing shape from the side away from the discharge port 3 to the side near the discharge port 3. The bottom of the rotating shaft 6 is provided with a spiral ribbon agitator 16, which is located at the discharge end 15 and is adapted to the gradually narrowing cavity wall of the discharge end 15.

[0037] Reference Figure 1 The bottom of the rotating shaft 6 is equipped with a ribbon agitator 16. This agitation function can turn the material up and down, so that the material can be discharged quickly. By turning the material up and down, the lumpy material or the material with moisture can be evaporated more easily.

[0038] Reference Figure 1In summary, the working principle of this thin-film evaporator is as follows: the liquid to be evaporated enters the reaction chamber 111 through the inlet and is evenly distributed on the side wall of the reaction chamber 111 under the centrifugal force of the distributor, and flows downward. Under the centrifugal force of the rotor, the scraper 13 adheres tightly to the cylinder wall, scraping the evenly flowing liquid to be evaporated into an extremely thin and uniform film on the evaporation surface of the inner cylinder wall. This film is rapidly evaporated because the heat of the steam in the jacket 17 of the cylinder 1 is transferred to the side wall of the reaction chamber 111. Furthermore, the grooves on the scraper 13 at a certain angle have a spiral propulsion effect, pushing the liquid downward and simultaneously scraping the liquid coming from above into a thin film for evaporation. This process of evaporation, downward pushing, film formation, and evaporation is repeated to complete the evaporation and concentration. The inlet flow rate and the temperature of the steam in the jacket 17 of the cylinder 1 are controlled according to different needs, and the required concentrated liquid is obtained from the outlet 3. The evaporated secondary steam passes upward through the demister 8 due to the vacuum effect, removes the droplets, and is discharged from the steam outlet 4.

[0039] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A novel scraped-film evaporator, comprising a cylindrical body (1) with a reaction chamber (111), wherein a feed inlet (2) is provided on the side wall of the cylindrical body (1), a discharge outlet (3) is provided on its bottom wall, and a steam outlet (4) is provided on its upper side, characterized in that: It also includes a gas-liquid separation structure (7), which includes two mist traps (8). A rotating shaft (6) is coaxially rotatably connected inside the reaction chamber (111). The two mist traps (8) are coaxially and fixedly connected to the rotating shaft (6) and located below the steam outlet (4). The two mist traps (8) are conical cylindrical structures. The smaller diameter ends of the two mist traps (8) are arranged opposite each other. Multiple through holes are evenly distributed on the side walls of the two mist traps (8).

2. The novel scraped-film evaporator according to claim 1, characterized in that: The larger diameter of the upper mist trap (8) is larger than that of the lower mist trap (8), and the smaller diameter of the upper mist trap (8) is larger than that of the lower mist trap (8), forming an upper and lower gradient conical structure.

3. The novel scraped-film evaporator according to claim 1, characterized in that: The gas-liquid separation structure (7) also includes two sets of defoaming blades (9), each set of defoaming blades (9) corresponding to two mist eliminators (8). Each set of defoaming blades (9) includes multiple inclined blades (91), which are evenly arranged on the circumferential side of the rotating shaft (6), and the ends of the multiple inclined blades (91) away from the rotating shaft (6) are fixedly connected to the mist eliminator (8).

4. A novel scraped-film evaporator according to claim 1, characterized in that: It also includes a feeder (10), which is coaxially and fixedly connected to the rotating shaft (6) and located below the feed inlet (2). The feeder (10) is flared, and the end with a larger diameter is farther from the feed inlet (2) than the end with a smaller diameter.

5. A novel scraped-film evaporator according to claim 1, characterized in that: It also includes multiple scrapers (13), and a rotating frame (11) is coaxially arranged on the rotating shaft (6). The multiple scrapers (13) are respectively rotatably connected to the rotating frame (11) along the axial direction of the rotating shaft (6). When the scraper (13) rotates to the limit position toward the side wall of the reaction chamber (111), the scraper (13) abuts against the side wall of the reaction chamber (111).

6. A novel scraped-film evaporator according to claim 5, characterized in that: The rotating frame (11) is hinged to a plurality of hinge frames (12), which are evenly distributed around the circumference of the rotating frame (11). Each of the hinge frames (12) corresponds to a plurality of scrapers (13), and each of the scrapers (13) is detachably connected to the corresponding hinge frame (12).

7. A novel scraped-film evaporator according to claim 1, characterized in that: The end of the reaction chamber (111) near the outlet (3) is the outlet end (15). The outlet end (15) is gradually narrowed from the side away from the outlet (3) to the side near the outlet (3). The bottom of the rotating shaft (6) is provided with a ribbon stirrer (16), which is located at the outlet end (15).

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