变径流化床反应器内的气固流动特性数值模拟  

Numerical Simulation of Gas-Solid Flow Characteristics in a Reducing Fluidized Bed Reactor

作　　者：陈艳 张亚新[1,2] CHEN Yan;ZHANG Yaxin(School of Chemistry and Chemical Engineering,Xinjiang University,Urumchi 830046,Xinjiang,China;Key Laboratory of Coal Clean Conversion and Chemical Engineering Process,Xinjiang University,Urumchi 830046,Xinjiang,China)

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046 [2]新疆大学煤炭清洁转化与化工过程自治区重点实验室,新疆乌鲁木齐830046

出　　处：《济南大学学报（自然科学版）》2020年第4期384-389,409,共7页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(21766034);新疆维吾尔自治区自然科学基金项目(2016D01C035)。

摘　　要：采用计算颗粒流体力学(CPFD)的数值模拟方法,对直径为160 mm、高度为2733 mm的变径流化床反应器内的气固流动特性进行冷态模拟,研究不同气速及不同初始物料量对流化床反应器气固流动特性的影响,得到流化床内颗粒体积分数、颗粒速度以及颗粒停留时间的分布。结果表明,当气速不小于2.5 m/s时,流化床内颗粒体积分数轴向分布更为均匀,颗粒速度呈中间高、两边低的倒“U”形分布;壁面附近的颗粒停留时间长于中心处,使得壁面附近的颗粒趋于聚集;流化床的轴径向颗粒体积分数随着初始物料量的增加而增大。The gas-solid flow characteristics of a diameter of 160 mm and length of 2733 mm reducing fluidized bed reactor were simulated by the computational particle fluid dynamics(CPFD)method.The effect of different gas velocity and initial material height on the axial and radial particle distribution in the fluidized bed reactor was studied.The particle volume fraction,particle velocity and particle residence time distribution in the fluidized bed were obtained.The results show that the axial distribution of the particle volume fraction in the fluidized bed is more uniform when the gas velocity is more than 2.5 m/s.The inverted“U”shape of the particle velocity is high at the middle and low at both sides.The particle residence time near the wall is higher than that near the center,so that the particles near the wall tend to cluster.The axial and radial particle volume fraction distribution of the fluidized bed increases with the augment of the initial material amount.

关 键 词：流化床 气-固两相流 流动特性 数值模拟 

分 类 号：TQ052[化学工程]