A wall scraping crystallization apparatus

Abstract

The utility model relates to crystallization equipment technical field especially is related to a kind of wall scraping type crystallization device, including crystallization shell, drive assembly, dispersion guide disc, wall scraping assembly and heating evaporation component, heating evaporation component and crystallization shell fixed connection, heating evaporation component is used to provide heat for crystallization shell, dispersion guide disc and wall scraping assembly are arranged in crystallization shell, and dispersion guide disc is located above wall scraping assembly, drive assembly and crystallization shell fixed connection, the output end of drive assembly extends to crystallization shell and is transmission connection dispersion guide disc and wall scraping assembly, the inside upper protrusion of crystallization shell is formed with preheating part and evaporation part, preheating part is located above evaporation part, dispersion guide disc and crystallization shell are between preheating part and evaporation part, by the preheating part and evaporation part respectively set in crystallization shell, the staged heating of material is realized.

Description

Technical Field

[0001] This utility model relates to the field of crystallization equipment technology, and in particular to a scraping-wall type crystallization device. Background Technology

[0002] In the chemical, pharmaceutical, and food industries, crystallization is a crucial process widely used for separating and purifying substances. Scraped-wall crystallizers are an important type of equipment in this process, particularly suitable for handling high-viscosity, easily fouling, or rapidly heat-exchange-required raw materials. Traditional scraped-wall crystallizers typically consist of a jacketed cylinder and an internally rotating scraping mechanism. During operation, the raw material evaporates and concentrates under jacket heating, precipitating crystals after reaching a supersaturated state. The scraping mechanism continuously removes scale and crystals formed on the cooling surface to maintain efficient heat transfer and prevent equipment blockage.

[0003] However, existing scraped-wall crystallizers still have some technical defects. After the raw material enters from the top, it usually falls directly into the evaporation zone. The contact between the raw material and the heated wall is insufficient and uneven, resulting in local overheating or concentration, which affects the uniformity and quality of the crystal product. The preheating process of the raw material in the existing equipment is not ideal. Cold raw material entering the main evaporation zone directly will consume a lot of extra heat energy and may cause poor crystal morphology due to sudden temperature changes. Traditional heating methods are difficult to achieve fine heat management at different stages of the crystallization process, resulting in low energy utilization efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the problem that in the prior art, after the raw material enters from the top, it usually falls directly into the evaporation zone, resulting in insufficient and uneven contact between the raw material and the heating wall, which leads to local overheating or concentration, affecting the uniformity and quality of the crystal product. The existing device has an unsatisfactory preheating process for the raw material, and the cold raw material directly entering the main evaporation zone will consume a lot of extra heat energy and may cause poor crystal morphology due to sudden temperature changes. Therefore, a scraping wall crystallization device is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a scraped-wall crystallization device, including a crystallization shell, a driving component, a dispersing guide disk, a scraping component, and a heating and evaporation component. The top surface of the crystallization shell has a feed inlet and a steam outlet, and the bottom surface of the crystallization shell has a crystallization outlet. The heating and evaporation component is fixedly connected to the crystallization shell and is used to provide heat to the crystallization shell. The dispersing guide disk and the scraping component are both arranged inside the crystallization shell, with the dispersing guide disk located above the scraping component. The driving component is fixedly connected to the crystallization shell, and the output end of the driving component extends into the crystallization shell and drives the dispersing guide disk and the scraping component. The driving component is used to provide power for the rotation of the dispersing guide disk and the scraping component. The crystallizing shell has a protruding preheating section and an evaporation section inside. The preheating section is located above the evaporation section, and the dispersion guide plate and the wall scraping assembly are located between the preheating section and the evaporation section. Through the preheating section and the evaporation section set inside the crystallizing shell, the material is heated in stages. The material is first preheated in the preheating section and then enters the evaporation section for forced evaporation and crystallization. This gradual heating method avoids cold material directly impacting the high-temperature evaporation surface, which saves energy and allows the supersaturation of the material to rise steadily, which is conducive to forming crystal products with uniform particle size and regular morphology.

[0006] To address the potential issues of uneven heating in jacketed heating methods, as well as the problems of loose connection between the heating assembly and the crystallization shell, resulting in significant heat loss, the heating evaporation assembly further includes a heating shell, an outlet pipe, and an inlet pipe. The heating shell and the crystallization shell are fixedly connected, with the heating shell located outside the crystallization shell. The heating shell and the crystallization shell enclose a heating cavity, which in turn encloses the crystallization shell. The outlet pipe and the inlet pipe are arranged on the heating shell.

[0007] To address the issues of the need for independent heat sources or uneven heat distribution between the preheating and evaporation sections, the design further includes forming a preheating cavity within the preheating section, forming an evaporation cavity within the evaporation section, and connecting the heating cavity to the preheating cavity and the evaporation cavity.

[0008] To address the issues of materials failing to effectively spread and form a film during the preheating stage and difficulties in crystal slurry aggregation during the crystallization stage, the system further includes a preheating section extending radially inward along the crystallization shell, and an evaporation section contracting inward from top to bottom to form an inverted conical structure.

[0009] To address the issue of materials stagnating on the dispersion disc or converging towards the center and failing to be effectively guided to the preheating section wall, a further improvement is made to the dispersion guide disc, which is inclined downwards from the center to the periphery.

[0010] The device further includes a wall scraping assembly comprising several scrapers, the scrapers being drivenly connected to the output end of a drive assembly, the scrapers causing the solution to be evenly distributed and in contact with the crystallization shell.

[0011] The device further includes a drive assembly comprising a motor and a drive shaft. The motor and the crystallizing shell are fixedly connected. The drive shaft is located inside the crystallizing shell. The output end of the motor is connected to the drive shaft. The dispersion guide disk and the wall scraping assembly are arranged on the drive shaft.

[0012] The beneficial effects of this utility model are as follows: The scraping-wall crystallization device provided by this utility model realizes the staged heating of materials through the preheating section and evaporation section respectively set inside the crystallization shell. The materials are first preheated in the preheating section and then enter the evaporation section for forced evaporation and crystallization. This gradual heating method avoids cold materials directly impacting the high-temperature evaporation surface, which not only saves energy but also makes the supersaturation of the materials rise steadily, which is conducive to forming crystal products with uniform particle size and regular morphology. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Crystallization shell, 11. Feed inlet, 12. Steam outlet, 13. Crystallization outlet, 14. Preheating section, 141. Preheating chamber, 15. Evaporation section, 151. Evaporation chamber, 2. Drive assembly, 21. Motor, 22. Drive shaft, 3. Dispersion guide plate, 4. Wall scraping assembly, 41. Scraper, 5. Heating and evaporation assembly, 51. Heating shell, 52. Liquid outlet pipe, 53. Liquid inlet pipe, 54. Heating chamber. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0017] like Figure 1 This is a schematic diagram of the structure of this utility model, a wall-scraping crystallization device, including a crystallization shell 1, a driving assembly 2, a dispersing guide disk 3, a wall-scraping assembly 4, and a heating and evaporation assembly 5. The top surface of the crystallization shell 1 has a feed inlet 11 and a steam outlet 12, and the bottom surface of the crystallization shell 1 has a crystallization outlet 13. The heating and evaporation assembly 5 is fixedly connected to the crystallization shell 1 and is used to provide heat to the crystallization shell 1. The dispersing guide disk 3 and the wall-scraping assembly 4 are both arranged inside the crystallization shell 1, with the dispersing guide disk 3 located above the wall-scraping assembly 4. The dispersion guide disk 3, located between the preheating section 14 and the evaporation section 15, rotates under the drive of the drive assembly 2. This allows it to evenly throw the falling material onto the surrounding walls of the preheating section, forming a uniform liquid film. This significantly increases the contact area between the material and the heated walls, improving preheating efficiency and uniformity. The drive assembly 2 is fixedly connected to the crystallization shell 1. The output end of the drive assembly 2 extends into the crystallization shell 1 and is connected to the dispersion guide disk 3 and the wall scraping assembly 4. The drive assembly 2 provides power for the rotation of the dispersion guide disk 3 and the wall scraping assembly 4. The crystallization shell 1 has a protruding preheating section 14 and an evaporation section 15 inside. The preheating section 14 is located above the evaporation section 15. The dispersion guide disk 3 and the wall scraping assembly 4 are located between the preheating section 14 and the evaporation section 15. Through the preheating section 14 and the evaporation section 15 respectively set inside the crystallization shell 1, the material is heated in stages. The material is first preheated in the preheating section and then enters the evaporation section for forced evaporation and crystallization. This gradual heating method avoids cold material directly impacting the high-temperature evaporation surface, which saves energy and makes the supersaturation of the material rise steadily, which is conducive to forming crystal products with uniform particle size and regular morphology.

[0018] The heating evaporation assembly 5 includes a heating shell 51, a liquid outlet pipe 52, and a liquid inlet pipe 53. The heating shell 51 and the crystallization shell 1 are fixedly connected. The heating shell 51 is located outside the crystallization shell 1. The heating shell 51 and the crystallization shell 1 enclose to form a heating cavity 54. The heating cavity 54 encloses the crystallization shell 1. The liquid outlet pipe 52 and the liquid inlet pipe 53 are arranged on the heating shell 51. The heating shell 51 and the crystallization shell 1 are fixed to form a surrounding heating cavity 54, which realizes uniform and efficient surrounding heating of the crystallization shell and reduces heat loss.

[0019] A preheating cavity 141 is formed inside the preheating section 14, and an evaporation cavity 151 is formed inside the evaporation section 15. The heating cavity 54 is connected to the preheating cavity 141 and the evaporation cavity 151. By connecting the heating cavity 54 to both the preheating cavity 141 and the evaporation cavity 151 simultaneously, two functional areas can be heated simultaneously with one heat source. The structure is simple and the heat distribution is reasonable.

[0020] The preheating section 14 extends radially inward along the crystallization shell 1. The inwardly extending preheating section 14 facilitates the reception of materials thrown out by the dispersion guide plate 3, and the planar design increases the residence time of the raw materials, ensuring sufficient preheating. The evaporation section 15 shrinks inward from top to bottom into an inverted cone shape. The inverted cone shape of the evaporation section increases the evaporation area and utilizes the inclined surface for natural flow guidance, which facilitates the crystal slurry to converge towards the outlet.

[0021] The dispersion guide plate 3 tilts downward from the center to the periphery. The tilted plate structure utilizes centrifugal force and gravity to actively and quickly guide the material from the center to the periphery and throw it onto the wall of the preheating section 14, thereby enhancing the dispersion and guiding effect.

[0022] The wall scraping assembly 4 includes several scrapers 41, which are connected to the output end of the drive assembly 2. The scrapers 41 make the solution evenly distributed and in contact with the crystallization shell 1, continuously and effectively scraping away the crystals and scale on the wall surface, keeping the heat transfer surface clean, and ensuring the long-term stable operation of the device.

[0023] The drive assembly 2 includes a motor 21 and a drive shaft 22. The motor 21 is fixedly connected to the crystallization shell 1, and the drive shaft 22 is located inside the crystallization shell 1. The output end of the motor 21 is connected to the drive shaft 22. The dispersion guide disk 3 and the wall scraping assembly 4 are arranged on the drive shaft 22.

[0024] Working process: The solution to be processed enters the crystallization shell 1 through the feed port 11 at the top. The solution first falls on the high-speed rotating dispersion guide plate 3, and is evenly dispersed and thrown to the inner wall of the preheating section 14 under the action of centrifugal force. At this time, the heat medium provided by the heating evaporation component 5 flows through the heating chamber 54 and heats the preheating section 14. The solution forms a liquid film on the inner wall of the preheating section 14 and flows downward, while being fully preheated. The preheated solution flows into the evaporation section 15 below. The core function of the evaporation section 15 is to serve as the main crystallization zone, providing sufficient contact space between the material and the heated wall to complete evaporation and crystallization. Here, the wall scraping component 4, especially the scraper 41, driven by the drive component 2, rotates closely against the inner wall of the evaporation section 15. The scraper 41 has two functions: first, it scrapes the material into a thin layer on the heated wall and forces circulation, ensuring that the material and the heated surface are in full and uniform contact, making the evaporation more complete; second, it promptly scrapes off the crystals precipitated on the wall of the crystallization shell 1 to prevent crystal buildup and maintain efficient heat transfer. The solvent in the solution is rapidly evaporated, reaching supersaturation and precipitating crystals to form a crystal slurry. The secondary steam generated by evaporation is discharged from the steam outlet 12 at the top. The slurry containing the target crystals is collected by gravity and flows to the crystallization outlet 13 at the bottom of the crystallization shell 1, where it is discharged from the device.

[0025] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A wall-scraping crystallization device, characterized in that, The assembly includes a crystallization shell (1), a drive assembly (2), a dispersion guide disk (3), a wall scraping assembly (4), and a heating and evaporation assembly (5). The top surface of the crystallization shell (1) has a feed inlet (11) and a steam outlet (12), and the bottom surface of the crystallization shell (1) has a crystallization outlet (13). The heating and evaporation assembly (5) is fixedly connected to the crystallization shell (1) and is used to provide heat to the crystallization shell (1). The dispersion guide disk (3) and the wall scraping assembly (4) are both arranged inside the crystallization shell (1), and the dispersion guide disk (3) is located above the wall scraping assembly (4). The drive assembly (2) is fixedly connected to the crystallization shell (1), and the output end of the drive assembly (2) extends into the crystallization shell (1) and drives the dispersion guide disk (3) and the wall scraping assembly (4). The drive assembly (2) is used to provide power for the rotation of the dispersion guide disk (3) and the wall scraping assembly (4). The crystallization shell (1) has a preheating section (14) and an evaporation section (15) protruding from its interior. The preheating section (14) is located above the evaporation section (15), and the dispersion guide plate (3) and the wall scraping assembly (4) are located between the preheating section (14) and the evaporation section (15).

2. The wall-scraping crystallization apparatus as described in claim 1, characterized in that: The heating and evaporation assembly (5) includes a heating shell (51), a liquid outlet pipe (52), and a liquid inlet pipe (53). The heating shell (51) and the crystallization shell (1) are fixedly connected. The heating shell (51) is located outside the crystallization shell (1). The heating shell (51) and the crystallization shell (1) enclose a heating cavity (54). The heating cavity (54) encloses the crystallization shell (1). The liquid outlet pipe (52) and the liquid inlet pipe (53) are arranged on the heating shell (51).

3. The wall-scraping crystallizer as described in claim 2, characterized in that: A preheating cavity (141) is formed in the preheating section (14), an evaporation cavity (151) is formed in the evaporation section (15), and the heating cavity (54) connects the preheating cavity (141) and the evaporation cavity (151).

4. The wall-scraping crystallizer as described in claim 1, characterized in that: The preheating section (14) extends radially inward along the crystallization shell (1), and the evaporation section (15) contracts from top to bottom inward to form an inverted cone shape.

5. The wall-scraping crystallizer as described in claim 1, characterized in that: The dispersed guide plate (3) tilts downward from the center to the periphery.

6. The wall-scraping crystallizer as described in claim 1, characterized in that: The wall scraping assembly (4) includes several scrapers (41), which are connected to the output end of the drive assembly (2). The scrapers (41) make the solution evenly distributed and in contact with the crystal shell (1).

7. The wall-scraping crystallizer as described in claim 1, characterized in that: The drive assembly (2) includes a motor (21) and a drive shaft (22). The motor (21) is fixedly connected to the crystallization shell (1). The drive shaft (22) is located inside the crystallization shell (1). The output end of the motor (21) is connected to the drive shaft (22). The dispersion guide disk (3) and the wall scraping assembly (4) are arranged on the drive shaft (22).

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