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Chemcial Industry and Engineering 2025, Vol. 42 Issue (2) :125-134    DOI: 10.13353/j.issn.1004.9533.20230169
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Influence of DTB crystallizer structure on flow characteristics
CHEN Zhirong, XIANG Yanting, YUAN Shenfeng, YIN Hong
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

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Abstract DTB crystallizer (draft tube baffled) can be used to produce methionine as a continuous industrial crystallization equipment. There are few studies have focused on the flow characteristics of industrial-scale DTB crystallizer at present. Computational fluid dynamics (CFD) technology and Euler-Euler model were used to describe the macroscopic flow characteristics of industrial DTB crystallizer. The rationality of increasing the guide vane to improve circulation in the crystallizer was investigated, and the effect of draft tube length and baffle length on fluid flow and particle suspension state was studied. The simulation results show that increasing the guide vane improves the axial flow effect of the crystallizer. When the draft tube length is 2.8 m, the DTB crystallizer can maintain a good internal circulation effect without unstable flow field due to high velocity reaching the boiling liquid level. The baffle length determines the size of the settling zone, and long baffle is unfavorable for eliminating fine crystals and stabilizing the operation of the crystallizer.
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CHEN Zhirong
XIANG Yanting
YUAN Shenfeng
YIN Hong
KeywordsDTB crystallizer   computational fluid dynamics   guide vane   draft tube   baffle     
Received 2023-04-24;
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CHEN Zhirong, XIANG Yanting, YUAN Shenfeng, YIN Hong.Influence of DTB crystallizer structure on flow characteristics[J]  Chemcial Industry and Engineering, 2025,V42(2): 125-134
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