HE Tao，WANG Jia，HE Qingzhong，LIAO Boquan

(College of Machinery Engineering, Sichuan University of Science and Engineering, Yibin 644007, China)

Abstract: EDEM software was used to simulate the mixing effect of ash particles when the cold slag tube of circulating fluidized bed boiler adopted non-fin, straight fin, right-angle fin and large-angle fin.The mixing index of ash particles at different times, the cyclic movement characteristics of individual particles and the mixing state of particles at the corners of the tube wall were compared and analyzed.The results show that the mixing index of the ash particles of the right-angled fins and the large-angled fins changes more drastically in the rapid mixing stage.When the mixing time is 20 s, the mixing index of ash particles of no fins, straight fins, right-angle fins and large-angle fins are 0.38, 0.41, 0.43 and 0.46 in sequence.In the stable mixing stage, the mixing effect at the edges and corners of the tube wall increases in the order of no fins, straight fins, right-angle fins and large-angled fins.From the point of view of the movement path of a single particle, the right-angled fins has the highest lifting height for a single particle, but the large-angled fins has the most lifting times for a single particle.Changing the fin structure obviously improves the mixing effect of ash particles, and the mixing effect of the large-angle fin structure is the best.

Keywords: fin structure；cooling tube；ash particles；mixing effect；mixed index

中图分类号：TK229.6                            文献标志码：A

文章编号：1008-5548(2022)01-0138-09

DOI:10.13732/j.issn.1008-5548.2022.01.015

收稿日期： 2021-08-02，修回日期：2021-12-01，在线出版时间：2021-12-08。

基金项目：四川省科技厅科技成果转化项目，编号：2017CC0046；自贡市科技计划项目，编号：2018GYCX22。

第一作者简介：何涛(1997—)，男，硕士研究生，研究方向为余热锅炉及其辅助设备设计。E-mail：1256530593@qq.com。

通信作者简介：王佳(1980—)，副教授，博士，硕士生导师，研究方向为机械优化设计。E-mail：wangjiayuting@163.com。