多晶硅气固流化床数值模拟与结构优化  

Numerical simulation and structure optimization of polysilicon gas-solid fluidized bed

作　　者：董一晨 张亚新[1,2] DONG Yichen;ZHANG Yaxin(School of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,Xinjiang,China;Key Laboratory of Coal Clean Conversion and Chemical Engineering Process,Xinjiang University,Urumqi 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：《化学工程》2023年第8期49-54,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21766034)。

摘　　要：以多晶硅流化床反应器为研究对象,反应器中气固物料分布最均匀为目标,采用CPFD(计算颗粒流体力学)方法耦合曳力模型,对叶栅式挡板流化床反应器内的流场进行冷态模拟和流场分布均匀性分析,探究了叶栅挡板主要结构参数对流化床内颗粒流化速度、颗粒体积分数、床层压降和床层膨胀比的影响规律。结果表明:叶栅挡板的设置有效改善了多晶硅气固流化床内的气固流动状态;挡板叶片数量越多时,颗粒体积分数变化越大;床层压降随安装高度降低而减小;叶片角度过大或过小时,颗粒速度波动明显;当叶栅挡板叶片倾角为45°、叶片数量为3、安装高度为0.168 m时,流化床内气固物料分布最均匀。To improve the uniformity of feedstock distribution in a polysilicon gas-solid fluidized bed reactor,the CPFD(computational particle fluid dynamics)method coupled with the drag model was used to simulate the reactor flow field in a cold state.The effects of the main structural parameters of the leaf grid baffle on the gas-solid flow characteristics in the fluidized bed were investigated,such as particle fluidization velocity,volume fraction,bed pressure drop and bed expansion ratio.The results show that the setting of the leaf grid baffle effectively improves the gas-solid flow state.Specifically,the variation in particle volume fraction is greater when the number of baffle blades is higher.The bed pressure drop decreases with lower installation height.The particle velocity fluctuates significantly as the blade angle is too large or too small.When the inclination angle of the leaf grid baffle blade is 45°,the number of blades is 3 and the installation height is 0.168 m,the gas-solid phase distribution in the fluidized bed is greatly improved.

关 键 词：CPFD 数值模拟 气固流化床 气固流动 挡板结构优化 

分 类 号：TQ051[化学工程]