化工进展2017，Vol.36Issue(7)：2381-2392,12.DOI:10.16085/j.issn.1000-6613.2016-2181
导向管喷动流化床内宽筛分硅颗粒流化特性的实验及模拟
Experiment and simulation on the flow characteristics of silicon particles with a wide size distribution in draft tube spout-fluid bed
摘要
Abstract
A cylindrical spout-fluid bed (182mm in inner diameter) equipped with a draft tube and loaded with sub-millimeter grade silicon particles of wide size distribution was used to study the gas bypassing fraction of spouting gas.Effects of static bed height,entrainment zone height,draft tube diameter,and the spouting and fluidizing gas velocity on the gas bypassing fraction of spouting gas were investigated.The results show that the gas bypassing fraction of spouting gas remains stable at low spouting gas velocities and decreases thereafter.At high spouting gas velocities,it reaches a stable value.At low spouting gas velocities,the gas fraction increases with the static bed height.When the spouting gas velocity is sufficiently high,the static bed height has little effect on the gas bypassing.In addition,the gas fraction increases with the fluidizing gas velocity and the draft tube diameter,but decreases with the entrainment zone height.Furthermore,a mathematical model for gas-particle two-phase flow in draft tube spout-fluid bed was established based on the Eulerian-Eulerian model according to the kinetic theory of granular flow.Effects of related parameters on simulation results were investigated by CFD simulation.The numerical simulation shows that both the calculated bed pressure drop and fluidization appearance show good agreement with the experimental results.Regarding applicability and reliability of the proposed model,it could be an effective tool to predict the experimental results.关键词
导向管喷动流化床/宽粒度分布/气体旁路/两相流/计算流体力学/数值模拟/实验验证Key words
draft tube spout-fluid bed/wide size distribution/gas bypassing/two-phase flow/computational fluid dynamics (CFD)/numerical simulation/experimental validation分类
化学化工引用本文复制引用
张月梅,黄国强,苏国良..导向管喷动流化床内宽筛分硅颗粒流化特性的实验及模拟[J].化工进展,2017,36(7):2381-2392,12.基金项目
国家自然科学基金项目(21676197). （21676197）
