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External circulating DTB fluidized bed crystallizer

A fluidized bed and external circulation technology, applied in the direction of solution crystallization, evaporation separation crystallization, etc., can solve the problems of increased crystal nucleation rate, increased fine crystals, frequent collisions, etc., and achieve the elimination of supersaturation and uniform crystal particle size distribution Effect

Inactive Publication Date: 2016-12-14
YIYANTANG YINGCHENG HEALTH SALT MFG
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  • Abstract
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Problems solved by technology

However, due to the stirring device in the DTB crystallizer, frequent collisions between the crystal and the stirring propeller will generate new crystal nuclei, which will increase the nucleation rate of the crystal in the tank, increase the number of fine crystals, and make it difficult to control the crystal particle size distribution.

Method used

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  • External circulating DTB fluidized bed crystallizer
  • External circulating DTB fluidized bed crystallizer
  • External circulating DTB fluidized bed crystallizer

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Embodiment Construction

[0012] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0013] figure 2 It is a structural diagram of a specific embodiment of the external circulation DTB fluidized bed crystallizer of the present invention. Such as figure 2 As shown, the external circulation DTB fluidized bed crystallizer of the present invention includes a tank body 1, a baffle plate 2, a draft tube 3, a salt foot 4, a heating chamber 5, a porous distribution plate 6, and an external circulation device 7. Wherein the structure and function of the tank body 1, the baffle plate 2, the guide tube 3, the salt foot 4, and the heating chamber 5 are similar to t...

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Abstract

The invention discloses an external circulating DTB fluidized bed crystallizer. A porous distributing plate is arranged below a guide cylinder to accelerate fluid entering the guide cylinder from the bottom of a tank, the material fluid is sprayed into the guide cylinder at high speed, crystal suspending is promoted, and crystal slurry in the crystallizer forms a uniform fluidized layer. The degree of supersaturation is effectively eliminated, crystal size distribution is even, meanwhile, an external circulating device is adopted, fluid flowing to the area between a baffle and the tank flows back to a heating chamber in the crystallization process, and external circulation of the fluid is achieved. The circulating mode is optimized, circulating efficiency is improved, and therefore crystallization efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of crystallizers, and more specifically relates to an external circulation DTB fluidized bed crystallizer. Background technique [0002] The DTB (Draft Tube Baffle) crystallizer is a crystallizer with higher efficiency that appeared in the 1960s. figure 1 is the structure diagram of DTB crystallizer. Such as figure 1 As shown in the figure, the inner guide tube and the stirring paddle driven by the external stirrer are arranged inside the crystallizer, which belongs to the crystallizer circulation suspension type crystallizer. However, due to the stirring device in the DTB crystallizer, frequent collisions between the crystal and the stirring propeller will generate new crystal nuclei, which will increase the nucleation rate of the crystal in the tank, increase the number of fine crystals, and make it difficult to control the crystal particle size distribution. Contents of the invention [0003] The pur...

Claims

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Application Information

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IPC IPC(8): B01D9/02
CPCB01D9/0031
Inventor 张红宇冯琳
Owner YIYANTANG YINGCHENG HEALTH SALT MFG
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