SONG Xiaojiao¹, WANG Shuai²

(1. Department of Energy and Power Engineering, Shanxi Institute of Energy, Jinzhong 030600, China; 2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

Abstract: In order to conduct more accurate computational fluid dynamics (CFD) numerical simulation of two-component particle mixing in a bubbling fluidized bed, a two-component drag force model with bubbles as meso-scale was established by combining particle dynamics theory and Euler multi-fluid model. The separation and mixing process of two-component particles was simulated in a three-dimensional bubbling fluidized bed reactor, and the accuracy of the model was verified by experimental data. The effects of external operating conditions and particle properties on the separation and mixing process of two-component particles were analyzed. The results show that the decrease of particle diameter, the increase of apparent velocity of gas inlet and the increase of bed temperature increase the heterogeneity of drag force between the two phases, and the mixing degree of solid particles increases gradually. With the decrease of particle diameter and inlet gas apparent velocity, the separation degree of two-phase particles increases and the mixing index decreases. Reasonable matching of particle properties and external operating conditions is beneficial to the separation of two-component particles.

Keywords: meso-scale drag force model；two-component particle；mixed；bubbling fluidized bed；computational fluid dynamics numerical simulation

中图分类号：TK224

文献标志码：A

文章编号：1008-5548(2021)04-0120-10

DOI:10.13732/j.issn.1008-5548.2021.04.015

收稿日期： 2020-12-23， 修回日期：2021-04-20，在线出版时间：2021-06-03 14:07。

基金项目：国家自然科学基金项目，编号：51606053。

第一作者简介：宋晓皎(1992—)，女，硕士研究生，研究方向为多组分颗粒相间作用机理。E-mail: 2812246135@qq.com。