Efficient plate type continuous crystallizer

Abstract

The utility model discloses an efficient plate type continuous crystallizer, which comprises a main body frame, a groove body, a stirring mechanism and a cooling mechanism, the groove body is fixed on the main body frame, the stirring mechanism and the cooling mechanism are arranged in the groove body, the cooling mechanism comprises a cooling plate, a plate connecting pipe and a choked flow separation disc, according to the arrangement structure of the cooling plates, the lower end of the mth cooling plate communicates with the upper end of the (m + 2) th cooling plate through a plate connecting pipe, and m is a natural number larger than 0 and smaller than n-1. Compared with the prior art, the cooling plate has the advantages that the sequential arrangement mode of the cooling plates is changed into a more scientific poorer layered arrangement structure, so that uniform arrangement and circulation of refrigerants are realized, the temperature consistency in the crystallizer is greatly improved, the local non-crystallization condition can be effectively avoided, and the service life of the crystallizer is prolonged. And the crystallization efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of crystallization equipment, and in particular to a high-efficiency plate-type continuous crystallizer. Background Technology

[0002] Cooling and crystallizing materials is a crucial unit operation in industries such as pharmaceuticals, chemicals, and food, as the quality of crystallization directly impacts product yield and quality. Crystallizers are commonly used in industrial continuous production; specifically, a crystallizer is a device used to achieve supersaturation of a solution to form crystal nuclei and promote crystal growth. The most widely used type of crystallizer is the cooling crystallizer, with the kettle crystallizer being even more common. The structure of a kettle crystallizer mainly includes a cylinder, inner cylinder, outer cylinder, cooling chamber, and spiral guide plates.

[0003] However, in this type of batch crystallizer, due to jacket cooling, crystallization begins at the batch wall, causing crystals to initially adhere to it. In severe cases, this can result in a thick layer of crystals on the wall, significantly impacting heat transfer efficiency. While increasing the stirring speed can reduce crystal adhesion on the wall, in many situations, the stirring speed itself is limited. Excessive stirring speed can drastically reduce the crystal size, affecting subsequent filtration and washing operations. It is also unsuitable for applications requiring larger crystals. Furthermore, in batch crystallizers, the stirring paddle generally cannot effectively scrape the crystals adhering to the wall, further hindering heat transfer.

[0004] In addition, the crystallization effect is better when the material is near the external cooling tank wall, while the material near the center of the tank crystallizes very slowly, resulting in uneven grain size and a very slow overall crystallization speed.

[0005] While adding cooling coils to a crystallizer can significantly increase the cooling area, the stationary nature of the coils causes crystals to form outside the coils during crystallization, severely impacting heat transfer. Furthermore, the addition of coils greatly reduces the stirring effect in the crystallizer, making wall scraping and stirring impossible. The formation of numerous crystals on the vessel walls and coils further worsens heat transfer, making it difficult for the crystallized slurry to be completely and smoothly discharged.

[0006] In addition, since the bottom of the crystallization vessel is often a standard elliptical head, for crystallization vessels with high material concentration and a large amount of crystalline solids, the discharge is often incomplete, and some crystalline solids will remain in the vessel and cannot be discharged, affecting the output and energy consumption.

[0007] Existing technologies also employ plate-type crystallizers, but because their cooling plates are still arranged sequentially, the refrigerant consistency is poor, making it difficult for the product to maintain stable formation during the crystallization process. This can easily result in uncrystallized material being discharged along with the product, accumulating and affecting the crystallization efficiency. Utility Model Content

[0008] The technical problem to be solved by this utility model is how to improve crystallization efficiency and refrigerant contact uniformity. In view of the above-mentioned technical problem, a high-efficiency plate-type continuous crystallizer is proposed.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency plate-type continuous crystallizer, comprising a main frame, a tank, a stirring mechanism, and a cooling mechanism. The tank is fixed on the main frame, and the stirring mechanism and the cooling mechanism are disposed inside the tank. The cooling mechanism includes cooling plates, plate connecting pipes, and flow-blocking partitions. The flow-blocking partitions are disposed between adjacent cooling plates. There are n cooling plates, where n is a natural number greater than 0. A refrigerant inlet pipe and a refrigerant outlet pipe are respectively disposed inside both ends of the tank.

[0010] The rear end of the refrigerant inlet pipe is connected to the front end of the third cooling plate through a plate connecting pipe. The front end of the refrigerant inlet pipe is connected to the front end of the second cooling plate through a plate connecting pipe. The front end of the refrigerant outlet pipe is connected to the rear end of the (n-1)th cooling plate through a plate connecting pipe. The rear end of the refrigerant outlet pipe is connected to the rear end of the nth cooling plate through a plate connecting pipe.

[0011] The arrangement of the cooling plates is configured such that the rear end of the m-th cooling plate is connected to the front end of the (m+2)-th cooling plate via a plate connecting pipe, where m is a natural number greater than 0 and less than n-1.

[0012] Furthermore, the tank body is provided with plate refrigerant inlet and plate refrigerant outlet at positions corresponding to the refrigerant inlet and refrigerant outlet pipes, respectively, and the plate refrigerant inlet and plate refrigerant outlet are connected to the corresponding refrigerant inlet and refrigerant outlet pipes inside.

[0013] Furthermore, the tank is provided with a material inlet and a material outlet at both ends, with the material inlet located at the bottom and the material outlet located at the top.

[0014] Furthermore, a jacket is provided within the interlayer of the tank, and a jacket refrigerant inlet and a jacket refrigerant outlet are provided at the bottom of the tank.

[0015] Furthermore, the stirring mechanism includes a stirring shaft, a scraper, and a driving device. The driving device is fixed at one end of the main frame, the stirring shaft is connected to the driving device, the scraper is fixed on the stirring shaft, the scraper is arranged between adjacent cooling plates, and the scraper is driven to rotate by the driving device through the stirring shaft.

[0016] Furthermore, the flow-blocking partition is a circular flow-blocking partition.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention changes the sequential arrangement of the cooling plates to a more scientific hierarchical arrangement, achieving uniform distribution and flow of the refrigerant. This greatly improves the temperature consistency inside the crystallizer, effectively preventing localized uncrystallization and significantly increasing crystallization efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the arrangement of the cooling plates in this utility model;

[0021] Figure 3 This is a side view of the structure of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figures 1-3 As shown in the figure, this specific embodiment discloses a high-efficiency plate-type continuous crystallizer, including a main frame 1, a tank 2, a stirring mechanism 3, and a cooling mechanism 4. The tank 2 is fixed on the main frame 1. The stirring mechanism 3 and the cooling mechanism 4 are disposed inside the tank 2. The cooling mechanism 4 includes cooling plates 41, plate connecting pipes 42, and flow-blocking partitions 43. The flow-blocking partitions 43 are disposed between adjacent cooling plates 41. There are n cooling plates 41, where n is a natural number greater than 0. A refrigerant inlet pipe 44 and a refrigerant outlet pipe 45 are respectively disposed inside both ends of the tank 2. Preferably, the flow-blocking partitions 43 are circular flow-blocking partitions. The circular structure can improve the coverage area and increase the flow-blocking effect.

[0024] Preferably, a drain port 25 is provided at the bottom center of the tank 2, through which sludge and residue accumulated inside the machine can be discharged, and a lever is provided for easy operation.

[0025] The rear end of the refrigerant inlet pipe 44 is connected to the front end of the third cooling plate through a plate connecting pipe 42. The front end of the refrigerant inlet pipe 44 is connected to the front end of the second cooling plate through a plate connecting pipe 42. The front end of the refrigerant outlet pipe 45 is connected to the rear end of the (n-1)th cooling plate through a plate connecting pipe 42. The rear end of the refrigerant outlet pipe 45 is connected to the rear end of the nth cooling plate through a plate connecting pipe 42.

[0026] The arrangement of the cooling plates 41 is configured such that the rear end of the m-th cooling plate 41 is connected to the front end of the (m+2)-th cooling plate 41 through a plate connecting pipe 42, where m is a natural number greater than 0 and less than n-1.

[0027] Preferably, the tank body is provided with plate-shaped refrigerant inlet ports 23 and 24 at positions corresponding to the refrigerant inlet pipe 44 and refrigerant outlet pipe 45, respectively. The plate-shaped refrigerant inlet ports 23 and 24 are connected to the corresponding internal refrigerant inlet pipe 44 and refrigerant outlet pipe 45. The plate-shaped refrigerant inlet ports 23 and 24 are fixed to the main frame 1 using bolts or other fixing structures.

[0028] Preferably, the tank 2 is provided with a material inlet 21 and a material outlet 22 at both ends, with the material inlet 21 located at the bottom and the material outlet 22 located at the top. This can further improve the contact rate. The material inlet 21 and the material outlet 22 are set as universal interfaces for connection with conveying pipelines, and manual or automatic valves are provided at the corresponding locations.

[0029] Preferably, a jacket 28 is provided in the interlayer of the tank body 2, and a jacket refrigerant inlet 26 and a jacket refrigerant outlet 27 are provided at the bottom of the tank body 2. By introducing refrigerant into the jacket, the overall heat preservation effect can be further improved, which is conducive to the stability of the internal crystallization process.

[0030] Preferably, the stirring mechanism 3 includes a stirring shaft 31, a scraper 32, and a driving device 33. The driving device 33 is fixed to one end of the main frame 1. The stirring shaft 31 is connected to the driving device 33 in a transmission manner. The scraper 32 is fixed on the stirring shaft and arranged between adjacent cooling plates 41. The scraper 32 is driven to rotate by the driving device 33 via the stirring shaft 31. The stirring shaft 31 passes through the cooling plates 41, and by scraping and stirring the walls, it cleans all the cooling surfaces, greatly improving heat transfer and cooling efficiency. The driving device 33 can be a structure using a drive motor and a reducer to provide driving force.

[0031] This invention changes the sequential arrangement of the cooling plates to a more scientific hierarchical arrangement, achieving uniform distribution and flow of the refrigerant. This greatly improves the temperature consistency inside the crystallizer, effectively preventing localized uncrystallization and significantly increasing crystallization efficiency.

[0032] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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, they should not be construed as limitations on this utility model.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A high-efficiency plate-type continuous crystallizer, characterized in that, The system includes a main frame (1), a tank (2), a stirring mechanism (3), and a cooling mechanism (4). The tank (2) is fixed on the main frame (1). The stirring mechanism (3) and the cooling mechanism (4) are located inside the tank (2). The cooling mechanism (4) includes cooling plates (41), plate connecting pipes (42), and flow-blocking partitions (43). The flow-blocking partitions (43) are located between adjacent cooling plates (41). There are n cooling plates (41), where n is a natural number greater than 0. The tank (2) has a refrigerant inlet pipe (44) and a refrigerant outlet pipe (45) located inside both ends. The rear end of the refrigerant inlet pipe (44) is connected to the front end of the third cooling plate through a plate connecting pipe (42), the front end of the refrigerant inlet pipe (44) is connected to the front end of the second cooling plate through a plate connecting pipe (42), the front end of the refrigerant outlet pipe (45) is connected to the rear end of the (n-1)th cooling plate through a plate connecting pipe (42), and the rear end of the refrigerant outlet pipe (45) is connected to the rear end of the nth cooling plate through a plate connecting pipe (42). The arrangement of the cooling plates (41) is configured such that the rear end of the m-th cooling plate (41) and the front end of the (m+2)-th cooling plate (41) are connected by a plate connecting pipe (42), where m is a natural number greater than 0 and less than n-1.

2. The high-efficiency plate-type continuous crystallizer according to claim 1, characterized in that, The tank body is provided with a plate refrigerant inlet (23) and a plate refrigerant outlet (24) at positions corresponding to the refrigerant inlet pipe (44) and refrigerant outlet pipe (45) respectively. The plate refrigerant inlet (23) and plate refrigerant outlet (24) are respectively connected to the corresponding refrigerant inlet pipe (44) and refrigerant outlet pipe (45) inside.

3. The high-efficiency plate-type continuous crystallizer according to claim 1, characterized in that, The tank (2) has a material inlet (21) and a material outlet (22) at both ends, with the material inlet (21) located at the bottom and the material outlet (22) located at the top.

4. The high-efficiency plate-type continuous crystallizer according to claim 1, characterized in that, The tank (2) has a jacket (28) inside its interlayer, and a jacket refrigerant inlet (26) and a jacket refrigerant outlet (27) are provided below the tank (2).

5. The high-efficiency plate-type continuous crystallizer according to claim 1, characterized in that, The stirring mechanism (3) includes a stirring shaft (31), a scraper (32) and a driving device (33). The driving device (33) is fixed at one end of the main frame (1). The stirring shaft (31) is connected to the driving device (33) in a transmission manner. The scraper (32) is fixed on the stirring shaft. The scraper (32) is arranged between adjacent cooling plates (41). The scraper (32) is driven to rotate by the driving device (33) through the stirring shaft (31).

6. The high-efficiency plate-type continuous crystallizer according to claim 1, characterized in that, The flow-blocking separator (43) is a circular flow-blocking separator.

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