A monohydrate citric acid crystallization tank

Abstract

The utility model relates to a kind of monohydrate citric acid crystallizing tank, including crystallizing tank and be used for the cooling device of cooling crystallizing tank and being arranged below crystallizing tank, crystallizing tank is installed on support and rotates under the driving of driving mechanism, the cooling device includes cold water tank and the power mechanism for driving cold water tank lifting.This utility model creatively uses the mode of rotating one side while water bath cooling, during the rotation of crystallizing tank, internal solution can be moved, and fully contact with the inner wall of crystallizing tank, improve heat exchange effect.Moreover, the contact area between tank wall and cold water in the mode of water bath cooling is large, and the heat exchange efficiency is high, thereby greatly improving cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of citric acid monohydrate production technology, and in particular to a citric acid monohydrate crystallization tank. Background Technology

[0002] The industrial production process of citric acid monohydrate is as follows: First, the citric acid fermentation broth is separated into solid and liquid to obtain citric acid clear liquid. The clear liquid is purified by calcium salt method, acid hydrolysis method, and decolorization method. Anhydrous citric acid is obtained by heating, concentration, and crystallization. Then, the concentrated liquid from which anhydrous citric acid is separated is repeatedly subjected to cooling crystallization, centrifugation separation, and drying to obtain citric acid monohydrate crystals.

[0003] Cooling crystallization primarily utilizes crystallization tanks. During crystallization, the tank needs to be cooled to achieve the desired result. Current cooling methods for crystallization tanks involve installing a jacket on the tank wall, arranging coils within the jacket, and circulating cooling water or other refrigerant through the coils. However, this coil-based cooling method has the following drawbacks: limited contact area between the coils and the tank wall, low heat exchange efficiency, and inability to rapidly exchange heat, resulting in poor cooling performance.

[0004] Based on the above problems, the inventors proposed a citric acid monohydrate crystallization tank to improve the cooling method, thereby greatly enhancing the cooling effect. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a citric acid monohydrate crystallization tank.

[0006] This utility model is achieved through the following technical solution: a citric acid monohydrate crystallizer is provided, comprising a crystallizer and a cooling device disposed below the crystallizer for cooling the crystallizer. The crystallizer is mounted on a support and rotates under the drive of a driving mechanism. The cooling device includes a cold water tank and a power mechanism for driving the cold water tank to rise and fall. When the cold water tank rises, the lower part of the crystallizer can be immersed in cold water, and cooling is achieved through water bath heat conduction. After cooling is completed, the cold water tank descends, allowing the crystallizer to be removed from the cold water tank.

[0007] Preferably, the support includes a base plate, with support rods vertically fixed to both sides of the base plate, and drive shafts fixed to both ends of the crystallization tank. The drive shaft at each end is connected to the corresponding support rod through a bearing.

[0008] Preferably, the drive mechanism is an electric motor, and the electric motor is preferably a YEJ series electromagnetic brake motor. The electromagnetic brake motor achieves rapid stopping and precise position control through a built-in electromagnetic braking system, and the speed can be adjusted through an electromagnetic speed regulator. A drive sprocket is installed on the output shaft of the electric motor, and a driven sprocket is installed on the transmission shaft at one end. The drive sprocket and the driven sprocket are driven by a chain.

[0009] Preferably, a feed pipe is installed on the crystallization tank, and a valve switch is installed on the feed pipe. When the valve switch is opened, the raw material is added into the crystallization tank through the feed pipe, and the valve switch is closed after the material is added. After crystallization is completed, the crystallization tank is rotated so that the feed pipe faces downwards, the conveying pipe is connected to the feed pipe, and the valve switch is opened to facilitate the discharge of the internal material.

[0010] Preferably, the cold water tank is mounted on a support plate, and the power mechanism includes four hydraulic cylinders, which are respectively mounted at the four corners of the support plate. The cylinder seat of each hydraulic cylinder is fixed to the base plate, and the piston rod of each hydraulic cylinder is connected to the support plate. The cold water tank is raised and lowered by the cooperation of the four hydraulic cylinders. Furthermore, in order to achieve synchronous operation of the four hydraulic cylinders, coordinated control can be achieved by a programmable logic controller (PLC). PLC-based coordinated control of the hydraulic cylinders is a prior art technology.

[0011] Preferably, an inlet and an outlet are provided on the left and right side walls of the cold water tank, respectively. The inlet is connected to the cold water delivery pipe, and the outlet is connected to the return water pipe.

[0012] The beneficial effects of this utility model are as follows: This invention innovatively employs a method of simultaneous rotation and water bath cooling. During the rotation of the crystallization tank, the internal solution moves and fully contacts the inner wall of the tank, enhancing heat exchange efficiency. Furthermore, the water bath cooling method results in a large contact area between the tank wall and the cold water, leading to high heat exchange efficiency and significantly improving the cooling effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the working state of the crystallizer of this utility model during cooling; Figure 2 This is a schematic diagram of the working state of the crystallizer of this utility model when it is not cooled down; As shown in the figure: 1. Crystallization tank, 2. Valve switch, 3. Material pipe, 4. Drive shaft, 5. Support rod, 6. Chain, 7. Water outlet, 8. Driven sprocket, 9. Electric motor, 10. Cold water tank, 11. Water inlet, 12. Pallet, 13. Hydraulic cylinder, 14. Base plate, 15. Drive sprocket. Detailed Implementation

[0014] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0015] like Figure 1-2As shown, this utility model includes a crystallization tank 1 and a cooling device disposed below the crystallization tank 1 for cooling the crystallization tank 1. The crystallization tank 1 is mounted on a support and rotates under the drive of a driving mechanism. The cooling device includes a cold water tank 10 and a power mechanism for driving the cold water tank 10 to rise and fall. When the cold water tank 10 rises, the lower part of the crystallization tank 1 can be immersed in cold water, and cooling is achieved through water bath heat conduction. After cooling is completed, the cold water tank 10 descends, allowing the crystallization tank 1 to be removed from the cold water tank 10.

[0016] In this embodiment, the support includes a base plate 14, with support rods 5 vertically fixed to both sides of the base plate 14, and drive shafts 4 fixed to both ends of the crystallization tank 1. Each drive shaft 4 is connected to the corresponding support rod 5 through a bearing.

[0017] Furthermore, the drive mechanism is an electric motor 9, preferably a YEJ series electromagnetic brake motor. The electromagnetic brake motor achieves rapid stopping and precise position control through a built-in electromagnetic braking system, and its speed can be adjusted through an electromagnetic speed regulator. A drive sprocket 15 is installed on the output shaft of the electric motor 9, and a driven sprocket 8 is installed on the transmission shaft 4 at one end. The drive sprocket 15 and the driven sprocket 8 are driven by a chain 6.

[0018] In this embodiment, a feed pipe 3 is provided on the crystallization tank 1, and a valve switch 2 is installed on the feed pipe 3. When the valve switch 2 is opened, the raw material is added into the crystallization tank 1 through the feed pipe 3. After the material is added, the valve switch 2 is closed. After crystallization is completed, the crystallization tank 1 is rotated so that the feed pipe 3 faces downwards, the conveying pipe is connected to the feed pipe 3, and the valve switch 2 is opened to facilitate the discharge of the internal material.

[0019] In this embodiment, the cold water tank 10 is mounted on the support plate 12. The power mechanism includes four hydraulic cylinders 13, which are respectively mounted at the four corners of the support plate 12. The cylinder seat of each hydraulic cylinder 13 is fixed to the base plate 14, and the piston rod of each hydraulic cylinder 13 is connected to the support plate 12. The cold water tank 10 is driven to rise and fall by the cooperation of the four hydraulic cylinders 13. Furthermore, in order to achieve synchronous operation of the four hydraulic cylinders 13, a programmable logic controller (PLC) can be used for coordinated control. The coordinated control of the hydraulic cylinders 13 by the PLC is a prior art technology.

[0020] In this embodiment, an inlet 11 and an outlet 7 are respectively provided on the left and right side walls of the cold water tank 10. The inlet 11 is connected to the cold water conveying pipe, and the outlet 7 is connected to the return water pipe.

[0021] In practical use, first load the material into crystallization tank 1, then raise the cold water tank 10 filled with cold water so that the lower part of crystallization tank 1 is immersed in the cold water. Operate crystallization tank 1 to rotate. While crystallization tank 1 is rotating, water bath cooling is carried out, and crystallization is achieved by cooling the tank body. During cooling, cold water must be continuously supplied to ensure the cooling effect.

[0022] This invention creatively employs a method of simultaneous rotation and water bath cooling. During the rotation of the crystallization tank 1, the internal solution moves and fully contacts the inner wall of the crystallization tank 1, improving the heat exchange effect. Moreover, the water bath cooling method results in a large contact area between the tank wall and the cold water, leading to high heat exchange efficiency and thus greatly enhancing the cooling effect.

[0023] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A crystallizing tank for citric acid monohydrate, characterized in that: It includes a crystallization tank and a cooling device located below the crystallization tank for cooling the crystallization tank. The crystallization tank is mounted on a support and rotates under the drive of a drive mechanism. The cooling device includes a cold water tank and a power mechanism for driving the cold water tank to rise and fall.

2. The citric acid monohydrate crystallizer according to claim 1, characterized in that: The support includes a base plate, with support rods vertically fixed to both sides of the base plate, and drive shafts fixed to both ends of the crystallization tank. Each drive shaft is connected to the corresponding support rod through a bearing.

3. The citric acid monohydrate crystallizing tank according to claim 2, characterized in that: The drive mechanism is an electric motor, with a drive sprocket mounted on the output shaft of the electric motor and a driven sprocket mounted on the transmission shaft at one end. The drive sprocket and the driven sprocket are driven by a chain.

4. The citric acid monohydrate crystallizing tank according to claim 1, characterized in that: A feed pipe is installed on the crystallization tank, and a valve switch is installed on the feed pipe.

5. A citric acid monohydrate crystallizing tank according to claim 2, characterized in that: The cold water tank is mounted on the pallet. The power mechanism includes four hydraulic cylinders, which are respectively mounted on the four corners of the pallet. The cylinder seat of each hydraulic cylinder is fixed to the base plate, and the piston rod of each hydraulic cylinder is connected to the pallet.

6. The citric acid monohydrate crystallizing tank according to claim 1, characterized in that: The cold water tank has an inlet and an outlet on its left and right side walls, respectively. The inlet is connected to the cold water delivery pipe, and the outlet is connected to the return water pipe.

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