Multistage continuous crystallization device

Abstract

The utility model provides a multistage continuous crystallization device which comprises a plurality of crystallization tanks, each crystallization tank is provided with a feed port and a discharge port, the inner top of each crystallization tank is fixedly connected with a corrugated condensation plate through a supporting rod, a collecting ring is arranged below each corrugated condensation plate along the peripheral wall of the corresponding crystallization tank, and the collecting rings are connected with the corresponding crystallization tanks. A liquid outlet is formed in the crystallizing tank and is used for collecting condensate in the ring and discharging the condensate; the corrugated condensation plate is obliquely arranged in the radial direction of the wave crests and the wave troughs, cooling media are contained in the corrugated condensation plate, a hydrophobic area and a flow guide area are arranged on the surface of the corrugated condensation plate, the hydrophobic area is coated with a hydrophobic coating, and the flow guide area is coated with a hydrophilic coating. The multi-stage continuous crystallization device disclosed by the utility model can effectively reduce the falling back of condensate, and is suitable for industrial production requirements.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a multi-stage continuous crystallization device. Background Technology

[0002] In existing crystallization devices, a large amount of condensate flows directly back into the mother liquor along the inner wall during the evaporation and crystallization of the solution. This forces the crystallization device to consume additional energy to re-evaporate the water, reducing the crystallization rate and affecting production. In addition, the condensate backflow dilutes the concentration of the mother liquor. Frequent fluctuations in the concentration of the mother liquor will interrupt the steady-state environment for crystal growth, resulting in uneven crystal particle size distribution and increasing product screening costs. Utility Model Content

[0003] The purpose of this invention is to solve the problem that the condensate flows directly back into the mother liquor along the inner wall, which reduces the evaporation rate and affects production efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multi-stage continuous crystallization device includes multiple crystallization tanks, each equipped with a feed inlet and a discharge outlet. The discharge outlet of an upstream crystallization tank is connected to the feed inlet of an adjacent downstream crystallization tank via a connecting pipe, forming a continuous inter-stage feeding channel. A motor is mounted on the top of each crystallization tank, and a stirring shaft with stirring blades is positioned at the center of the tank. The motor drives the stirring blades to rotate via the stirring shaft, promoting crystal nuclei formation. A heating layer is provided on the periphery of each crystallization tank. A corrugated condenser plate is fixedly connected to the top of each crystallization tank via a support rod. A collection ring is provided below the corrugated condenser plate along the periphery of the crystallization tank, and a liquid outlet is provided on the crystallization tank for discharging condensate from the collection ring. The corrugated condenser plate is radially inclined along its crests and troughs, and contains a cooling medium. The surface of the corrugated condenser plate has a hydrophobic zone and a flow-guiding zone, with the hydrophobic zone coated with a hydrophobic coating and the flow-guiding zone coated with a hydrophilic coating.

[0006] Furthermore, the cooling medium is cooling water or an aqueous solution of propylene glycol.

[0007] Furthermore, the hydrophobic zone is located in the crest region, and the flow guiding zone is located in the trough region.

[0008] Furthermore, the hydrophobic coating is polytetrafluoroethylene or fluorinated polyurethane.

[0009] Furthermore, the hydrophilic coating is a titanium oxide or silane-based hydrophilic coating.

[0010] Furthermore, the corrugated condenser plate has a radial angle of 20°-30° with the horizontal plane along the crests and troughs.

[0011] Furthermore, let the height of the flow guiding zone be h, and the height of the corrugated condenser plate be H, where H is 2 to 3 times h.

[0012] Furthermore, h is 3mm-5mm.

[0013] Furthermore, let the width of the flow guiding zone be a, and the width of one corrugation cycle of the corrugated condenser plate be A, where A is 2 to 3 times a.

[0014] Furthermore, 'a' is 10mm-15mm.

[0015] The multi-stage continuous crystallization apparatus of this invention has the following technical advantages:

[0016] The corrugated condenser plate increases the condensation surface area by setting alternating convex and concave corrugations. At the same time, it uses the change in curvature of the surface to disrupt the surface tension of the droplets, accelerating the aggregation and directional flow of the droplets. The hydrophobic region at the crest and the hydrophilic guiding region at the trough form a synergistic effect of hydrophobic repulsion and hydrophilic guidance. The corrugated condenser plate is set radially inclined along the crests and troughs to accelerate the discharge of condensate to the collection ring and prevent it from falling back. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multi-stage continuous crystallization device proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a single crystallizer in the multi-stage continuous crystallization device proposed in this utility model;

[0019] Figure 3 for Figure 1 and Figure 2 A magnified view of the corrugated condenser plate at point A in the middle.

[0020] 1. Motor, 2. Stirring shaft, 3. Stirring blades, 4. Crystallization tank, 5. Feed inlet, 6. Discharge outlet, 7. Support rod,

[0021] 8. Corrugated condenser plate, 9. Connecting pipe, 10. Liquid outlet, 11. Collection ring, 12. Hydrophobic zone, 13. Flow guiding zone, 14.

[0022] Cooling medium. Detailed Implementation

[0023] To clearly illustrate the design concept of this utility model, the following description is provided in conjunction with examples.

[0024] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the examples of the present invention. Obviously, the described examples are only a part of the examples of the present invention, and not all of them. Based on the examples of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] In the description of this embodiment, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0026] refer to Figure 1-3 This utility model provides a multi-stage continuous crystallization device, including multiple crystallization tanks 4, each equipped with a feed inlet 5 and a discharge outlet 6. The discharge outlet of the upstream crystallization tank is connected to the feed inlet of the downstream adjacent crystallization tank via a connecting pipe 9, forming an inter-stage continuous feeding channel. A motor 1 is installed at the top of the crystallization tank 4, and a stirring shaft 2 is installed at the center of the crystallization tank 4. Stirring blades 3 are installed on the stirring shaft 2. The motor 1 drives the stirring blades 3 to rotate through the stirring shaft 2, promoting the formation of crystal nuclei. A heating layer (not shown in the figure) is provided on the peripheral wall of the crystallization tank 4, and heating elements (not shown in the figure) are laid in the heating layer. A corrugated condenser plate 8 is fixedly connected to the top of the crystallization tank 4 by a support rod 7. A collection ring 11 is provided below the corrugated condenser plate 8 along the peripheral wall of the crystallization tank 4. A liquid outlet 10 is provided on the crystallization tank 4 for discharging the condensate in the collection ring 11. The corrugated condenser plate 8 is positioned along the crests and... The corrugated condenser plate 8 is radially inclined, with an angle of 20°-30° to the horizontal plane. It contains a cooling medium 14, which is either cooling water or a propylene glycol aqueous solution. The surface of the corrugated condenser plate 8 is provided with a hydrophobic region 12 and a flow-guiding region 13. The hydrophobic region 12 is located in the crest region, and the flow-guiding region 13 is located in the trough region. The hydrophobic region 12 is coated with a hydrophobic coating, and the flow-guiding region 13 is coated with a hydrophilic coating. The hydrophobic coating is polytetrafluoroethylene or fluorinated polyurethane, and the hydrophilic coating is titanium dioxide or a silane-based hydrophilic coating. The height of the flow-guiding region 13 is h, and the height of the corrugated condenser plate 8 is H, preferably 2 to 3 times h, where h is 3mm-5mm. The width of the flow-guiding region 13 is a, and the width of one corrugation cycle of the corrugated condenser plate 8 is A, preferably 2 to 3 times a, where a is 10mm-15mm. The condensate forms a synergistic effect of hydrophobic repulsion and hydrophilic guidance on the surface of the corrugated condenser plate 8.

[0027] During operation, hot steam inside the crystallizer 4 comes into contact with the hydrophobic area 12 of the corrugated condenser plate 8, rapidly condenses into droplets, and slides into the hydrophilic guide area 13 of the trough. The droplets flow radially along the trough into the collection ring 11 by gravity and the inclined slope, and the condensate in the collection ring 11 is discharged through the outlet 10.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application.

[0029] Finally, it is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the principles and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A multistage continuous crystallization apparatus, characterized by, The system includes multiple crystallization tanks, each equipped with an inlet and an outlet. The outlet of an upstream crystallization tank is connected to the inlet of an adjacent downstream crystallization tank via a connecting pipe, forming a continuous interstage feeding channel. A motor is mounted on the top of each crystallization tank, and a stirring shaft with stirring blades is located at the center of the tank. The motor drives the stirring blades to rotate via the stirring shaft, promoting crystal nuclei formation. A heating layer is provided on the periphery of each crystallization tank. A corrugated condenser plate is fixedly connected to the top of the crystallization tank via a support rod. A collection ring is provided below the corrugated condenser plate along the periphery of the crystallization tank, and an outlet is provided on the crystallization tank for discharging the condensate from the collection ring. The corrugated condenser plate is radially inclined along its crests and troughs, and contains a cooling medium. The surface of the corrugated condenser plate has a hydrophobic zone and a flow-guiding zone, with the hydrophobic zone coated with a hydrophobic coating and the flow-guiding zone coated with a hydrophilic coating.

2. The multi-stage continuous crystallization apparatus according to claim 1, characterized in that: The cooling medium is cooling water or an aqueous solution of propylene glycol.

3. The multi-stage continuous crystallization apparatus of claim 1, wherein: The hydrophobic zone is located in the wave crest region, and the flow guiding zone is located in the wave trough region.

4. The apparatus of claim 1, wherein: The hydrophobic coating is made of polytetrafluoroethylene or fluorinated polyurethane.

5. The apparatus of claim 1, wherein: The hydrophilic coating is a titanium oxide or silane-based hydrophilic coating.

6. The multi-stage continuous crystallization apparatus of claim 1, wherein: The corrugated condenser plate has a radial angle of 20°-30° with the horizontal plane along the crests and troughs.

7. The apparatus of claim 1, wherein: Let the height of the flow guiding zone be h, and the height of the corrugated condenser plate be H, where H is 2 to 3 times h.

8. The multi-stage continuous crystallization apparatus of claim 7, wherein: h is 3mm-5mm.

9. The apparatus of claim 1, wherein: Let the width of the flow guiding zone be a, and the width of one corrugation cycle of the corrugated condenser plate be A, where A is 2 to 3 times a.

10. The multi-stage continuous crystallization apparatus of claim 9, wherein: a is 10mm-15mm.

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