A multi-stage countercurrent industrial extraction column suitable for fouling-prone systems

Abstract

The utility model discloses a kind of multi-stage countercurrent industrial extraction towers suitable for easy scale formation system, when the extraction tower operates, light phase enters from tower bottom and flows upwards, heavy phase enters from tower top and flows downwards, two phases realize countercurrent contact in tower, multiple extraction units are equipped in tower, each unit is composed of one flow guide stator as clarification unit and one droplet disperser as mixing unit, and the mixing and clarification separation process of two phases are alternately completed.For coping with easy scale formation condition, the easy scale formation site of flow guide stator and droplet disperser in the utility model patent is respectively set as multi-layer scale prevention structure, scale prevention layer uses material (such as PP, PTFE, mirror stainless steel etc.) that surface is smooth and not easy scale formation, and is connected by detachable mode such as fastening screw, buckle.In parking maintenance, only need to remove scale prevention component to clean or replace, maintenance time caused by scale formation is significantly shortened, and overall maintenance is more convenient and efficient.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology for extraction, and in particular to a multi-stage countercurrent industrial extraction tower suitable for systems prone to scaling. Background Technology

[0002] In chemical, metallurgical, and pharmaceutical industries, multi-stage countercurrent extraction towers are crucial for separating complex systems due to their ability to achieve efficient countercurrent contact between the light phase (entering from the bottom and flowing upwards) and the heavy phase (entering from the top and flowing downwards). The alternating flow guiding units and droplet mixing and dispersion units within the tower facilitate the two-phase mixing and clarification process. However, when processing materials containing high-hardness salts, organic polymers, or easily precipitated components, scaling easily occurs in the flow guiding units, droplet mixing and dispersion units, and fluid channels under fouling conditions. Traditional extraction towers often have monolithic structures for these core components, lacking specific anti-scaling designs. Scaling necessitates disassembly and cleaning of the entire tower section, leading to complex disassembly processes and significantly extended downtime for maintenance, severely impacting the continuity and efficiency of industrial production. Therefore, efficiently addressing the scaling and maintenance issues of multi-stage countercurrent extraction towers has become a major technical bottleneck in the application of such equipment in systems prone to scaling. Utility Model Content

[0003] This invention addresses the aforementioned technical problems by proposing a multi-stage countercurrent industrial extraction tower suitable for systems prone to scaling. The scaling-prone parts of the flow guide stator and droplet disperser are respectively configured with multi-layered anti-scaling structures. The anti-scaling layers are made of a cleanable material and are connected in a detachable manner. During tower shutdown for maintenance, only the anti-scaling components need to be removed for cleaning or replacement, significantly shortening maintenance time caused by scaling and making overall maintenance more convenient and efficient. The specific solution is as follows: This utility model provides a multi-stage countercurrent industrial extraction tower suitable for systems prone to scaling, comprising several alternately arranged flow guide stators and droplet dispersers. Each droplet disperser includes a central connecting plate and at least 3-6 droplet dispersing tubes connected to the central connecting plate. The lower wall of each droplet dispersing tube has several uniformly distributed leakage holes. The droplet dispersing tube has a split structure, with its upper and lower walls sealed together in a detachable manner. The lower wall has a multi-layer anti-scaling structure, including at least one load-bearing plate and one anti-scaling plate, with the anti-scaling plate located above the load-bearing plate. The anti-scaling plate is made of one or a combination of two of the following materials: PE, PP, PTFE, FRP, PVC, CPVC, glass, ceramic, or mirror-finished stainless steel. As a preferred embodiment, a non-metallic material, such as polytetrafluoroethylene, is sprayed or coated onto the outer layer of the stainless steel.

[0004] Furthermore, the droplet dispersion tube is an elliptical tube or a semi-elliptical tube. If it is an elliptical tube, it is formed by two semi-elliptical upper and lower tube walls that are detachably sealed together. If it is a semi-elliptical tube, it is formed by a semi-elliptical upper tube wall and a horizontal lower tube wall that are detachably sealed together.

[0005] Furthermore, the upper and lower pipe walls of the droplet dispersion tube are provided with connecting edges at their joint edges, and the upper and lower connecting edges are connected in a detachable manner.

[0006] Furthermore, the connection between the fastening screw and the threaded hole can also be replaced by a snap-fit ​​connection.

[0007] Furthermore, the surface of the flow guide stator is a detachable multi-layer anti-scaling structure, including at least one load-bearing plate and one anti-scaling plate, with the anti-scaling plate located above the load-bearing plate. The anti-scaling plate is made of one or a combination of two of the following materials: PE, PP, PTFE, FRP, PVC, CPVC, glass, ceramic, or mirror stainless steel. As a preferred embodiment, a non-metallic material, such as polytetrafluoroethylene, is sprayed or coated on the outer layer of the stainless steel.

[0008] Furthermore, the outlet at the end of the droplet dispersion tube furthest from the central connecting plate is closed, forcing the fluid to be discharged only through the leakage hole on the anti-scaling porous plate / anti-scaling porous half-pipe (14), thereby achieving uniform dispersion of the droplets.

[0009] Furthermore, the extraction tower has one more flow guide stator than the droplet disperser.

[0010] The beneficial effects of this utility model are as follows: The easily scaled parts of the flow guide stator and droplet disperser are respectively designed with multi-layer anti-scaling structures. The anti-scaling layer is made of smooth, non-scaling materials (such as PP, PTFE, mirror stainless steel, etc.) and is connected by detachable methods such as fastening screws and clips. When the machine is stopped for maintenance, it is only necessary to remove the anti-scaling parts for cleaning or replacement, which significantly shortens the maintenance time caused by scaling and makes the overall maintenance more convenient and efficient. The optimized design of the droplet disperser makes its structure more reasonable, which can keep the particle size of the dispersed phase droplets within the ideal range, and effectively prevent scaling while ensuring mass transfer efficiency. It is efficient and easy to maintain, and improves extraction efficiency in a modular and systematic way. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the extraction tower of this utility model; Figure 2 This is a schematic diagram of the current-guiding stator structure of this utility model; Figure 3This is an exploded view of the current-guiding stator of this utility model; Figure 4 This is a schematic diagram of the droplet disperser structure of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the droplet disperser structure of this utility model. Figure 2 .

[0012] The attached diagram is labeled as follows: 1. Flow guide stator; 2. Droplet disperser; 3. Light phase channel; 4. Liquid guide hole; 5. Flow guide plate; 6. Load-bearing plate; 7. Anti-scaling plate; 8. Fastening screw; 9. Upper wall of droplet dispersion tube; 10. Material inlet; 11. Extractant inlet; 12. Light phase component outlet; 13. Heavy phase component outlet; 14. Lower wall of droplet dispersion tube; 15. Central connecting plate; 16. Hub. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] It should be noted that the various installation methods and technical terms mentioned in this invention are all well-known technical terms in the relevant technical field, and therefore will not be explained further. Furthermore, the same reference numerals are used for the same components, but this does not affect, nor should it constitute, an accurate understanding of the technical solution by those skilled in the art.

[0015] Example 1 A multi-stage countercurrent industrial extraction tower suitable for systems prone to scaling, such as Figure 1 The diagram shows the overall structure of the extraction tower in this embodiment. The tower diameter is 1.5m. Several sets of internal components are evenly distributed inside the extraction tower, specifically 11 flow guide stators 1 and 10 droplet dispersers 2. The ratio of the diameter d of the droplet disperser to the inner diameter D of the extraction tower, d / D, is controlled between 0.95 and 0.98. During installation, the flow guide stators 1 and droplet dispersers 2 need to be staggered and precisely connected to ensure the smooth flow path of the two phases. The combined design of the flow guide stators 1 and droplet dispersers 2 ensures that the flow paths of light and heavy components in the tower are clear and do not interfere with each other.

[0016] The droplet disperser includes a central connecting plate 15 and at least 3 to 6 droplet dispersing tubes connected to the central connecting plate 15. A hub 16 is provided inside the central connecting plate 15 for fixing the droplet disperser 2 to the stirring shaft inside the extraction tower. To ensure sufficient stability of the stirrer during high-speed operation, both the hub 16 and the central connecting plate 15 are thickened. Figure 4 and 5 As shown, the droplet dispersion tube in this embodiment is a semi-elliptical tube, consisting of a semi-elliptical upper tube wall and a horizontal lower tube wall connected by a detachable seal. The lower tube wall 14 has several evenly distributed leakage holes. The droplet dispersion tube has a split structure, with its upper and lower tube walls (9, 14) connected by a detachable seal. The lower tube wall 14 of the droplet dispersion tube has a two-layer anti-scaling structure, including a load-bearing plate 6 and an anti-scaling plate 7 positioned above the load-bearing plate 6. The load-bearing plate 6 is made of stainless steel, and the anti-scaling plate 7 is made of stainless steel with an outer layer coated with polytetrafluoroethylene. The outlet at the end of the droplet dispersion tube furthest from the central connecting plate is closed, forcing the fluid to exit only through the leakage holes on the lower tube wall 14 of the droplet dispersion tube, thus achieving uniform droplet dispersion.

[0017] Specifically, in order to facilitate disassembly and connection, the upper and lower tube walls (9, 14) of the droplet dispersion tube are provided with connecting edges at the joint edges. Several threaded holes are opened on the upper and lower connecting edges. The upper and lower tube walls are connected by several fastening screws 8 to the threaded holes. In order to better seal the connection between the upper and lower tube walls, a sealing gasket is also provided.

[0018] At the same time, in order to achieve a better anti-scaling effect, such as Figure 2 and 3 As shown, the surface of the flow guide stator is also designed as a detachable double-layer anti-scaling structure, including a load-bearing plate 6 and an anti-scaling plate 7 set above the load-bearing plate 6. The load-bearing plate 6 is made of stainless steel, and the anti-scaling plate 7 is made of stainless steel with an outer layer coated with polytetrafluoroethylene.

[0019] Example 2 This embodiment features an extraction tower with a diameter of 1.0 meter. Several sets of internal components are evenly distributed within the extraction tower, and the structural setup is the same as in Embodiment 1. The difference is that the droplet dispersion tube in this embodiment is an elliptical tube body, which is formed by two semi-elliptical upper and lower tube walls that are detachably sealed together. The lower tube wall has a three-layer structure, including a bottom load-bearing plate and an anti-scaling plate located on top of the load-bearing plate. The anti-scaling plate has two layers, both located on top of the load-bearing plate, and is made of PE material. The load-bearing plate and the anti-scaling plate are detachably connected by a snap-fit ​​mechanism.

[0020] The specific operation process is as follows: During operation, the heavy phase liquid enters the tower through the material inlet 10 (A port) and then flows through the central liquid guiding hole of the upper guide stator to the central connecting plate of the droplet disperser. The rotating droplet disperser breaks the heavy phase liquid into droplets with controllable particle size through centrifugal force, which are evenly dispersed in the extraction tower. During the descent, the droplet disperser comes into countercurrent contact with the light phase liquid that enters the tower from the extractant inlet 11 (C port). After the light and heavy liquids are mixed and separated in stages through the guide stator and the droplet disperser, the light phase flows upward along the light phase channel 3 on the guide stator at the top of the tower, while the heavy phase flows into the bottom of the tower through the liquid guiding hole 4 in the middle of the guide stator at the bottom of the tower. After further separation at the top and bottom of the tower, the light and heavy phase liquids flow out of the extraction tower after completing the extraction process through the light phase component outlet 12 (D port) and the heavy phase component outlet 13 (B port).

[0021] In summary, this utility model achieves efficient and stable liquid-liquid extraction through the above technical solution. Furthermore, it incorporates multi-layer anti-scaling structures at the easily scaled parts of the flow guide stator and droplet disperser, making overall maintenance more convenient and efficient. It can be widely applied in industries such as chemical, pharmaceutical, and food processing, and has significant industrial application value.

[0022] For those skilled in the art, this invention is not limited to the details of the exemplary embodiments described above, and can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage countercurrent industrial extraction tower suitable for systems prone to scaling, comprising several alternately arranged flow guide stators (1) and droplet dispersers (2), wherein the droplet disperser (2) comprises a central connecting plate and 3 to 6 droplet dispersing tubes connected to the central connecting plate (15), and the lower wall of the droplet dispersing tubes is uniformly provided with several leakage holes, characterized in that: The droplet dispersion tube (5) is a split structure, with its upper and lower tube walls sealed together in a detachable manner. The lower tube wall is a multi-layer anti-scaling structure, including at least one load-bearing plate and one anti-scaling plate. The anti-scaling plate is located above the load-bearing plate. The anti-scaling plate is made of one of the following materials: PE, PP, PTFE, FRP, PVC, CPVC, glass, ceramic, or mirror stainless steel.

2. The multi-stage countercurrent industrial extraction tower as described in claim 1, characterized in that: The droplet dispersion tube (5) is an elliptical tube or a semi-elliptical tube. If it is an elliptical tube, it is formed by two semi-elliptical upper and lower tube walls that are sealed together in a detachable manner. If it is a semi-elliptical tube, it is formed by a semi-elliptical upper tube wall and a horizontal lower tube wall that are sealed together in a detachable manner.

3. The multi-stage countercurrent industrial extraction tower as described in claim 1 or 2, characterized in that: The droplet dispersion tube (5) has connecting edges at the joint edges of the upper and lower tube walls, and the upper and lower connecting edges are connected in a detachable manner.

4. The multi-stage countercurrent industrial extraction tower as described in claim 1 or 2, characterized in that: The surface of the flow guide stator (1) is a detachable multi-layer anti-scaling structure, including at least one load-bearing plate and one anti-scaling plate, and the anti-scaling plate is located above the load-bearing plate. The anti-scaling plate is made of one of the following materials: PE, PP, PTFE, FRP, PVC, CPVC, glass, ceramic or mirror stainless steel.

5. The multi-stage countercurrent industrial extraction tower as described in claim 1 or 2, characterized in that: The outlet of the droplet dispersion tube (5) is closed at the end furthest from the central connecting plate.

6. The multi-stage countercurrent industrial extraction tower as described in claim 1 or 2, characterized in that: The extraction tower has one more flow guide stator than the droplet disperser.

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