Discussion on technology of improving separation efficiency of liquid-liquid hydrocyclone

doi:10.16085/j.issn.1000-6613.2020-2545

Abstract

Abstract:

To solve the problem of low separation efficiency for small particle size , which restricts the deep improvement of the cyclone separation efficiency, the liquid-liquid hydrocyclone was chosen as the analysis object. The key physical factors affecting the separation efficiency were summarized, including the residence time of discrete phase in the swirl field, particle size of discrete phase, rotation radius of discrete phase from the central axis, tangential rotation velocity of discrete phase, and the whole separation process system. Specifically, it was first analyzed and summarized in this work the current technical measures to improve cyclone separation efficiency, such as two-stage series hydrocyclone, dispersed phase coalescer, small-diameter hydrocyclone, and dynamic hydrocyclone that can increase the tangential velocity. Then, several new technical solutions to improve the separation efficiency were proposed from multiple aspects, which provides certain theoretical and technical support for the high-efficiency hydrocyclone design and system optimization for liquid-liquid, solid-liquid, gas-liquid, gas-liquid-solid and other multiphase mixtures.

Key words: hydrocyclone, residence time, particle size, rotation radius, tangential velocity, separation efficiency

摘要：

为解决微小粒径分散相分离效率不高，制约水力旋流器分离效率深度提升的问题，本文以液-液水力旋流器为分析对象，在总结已有理论及研究成果基础上，分别从影响旋流分离效率的关键物理因素，包括分散相在旋流场内的停留时间、分散相粒径、分散相距轴心旋转半径、分散相切向旋转速度以及旋流分离工艺系统五个方面出发，首先对已有提升旋流分离效率的水力旋流器串联工艺、分散相粒径聚结器、小直径旋流分离器及增强切向速度的动态水力旋流器等技术措施进行分析总结，并在此基础上提出了促进旋流分离效率深度提升的新型技术方案，为液-液两相以及固-液、气-液、气-液-固等多相混合介质的高效旋流分离器设计及系统优化提供一定理论及技术支撑。

关键词: 水力旋流器, 停留时间, 粒径, 旋转半径, 切向速度, 分离效率

CLC Number:

TQ051.8

SONG Minhang, ZHAO Lixin, XU Baorui, LIU Lin, ZHANG Shuang. Discussion on technology of improving separation efficiency of liquid-liquid hydrocyclone[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6590-6603.

宋民航, 赵立新, 徐保蕊, 刘琳, 张爽. 液-液水力旋流器分离效率深度提升技术探讨[J]. 化工进展, 2021, 40(12): 6590-6603.

Figures/Tables 19

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