涡流空气分级流场中团聚体破碎规律研究  

Study of aggregate fragmentation laws in turbo air classification flow field

作　　者：刘克润 于源[1] LIU Kerun;YU Yuan(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《化工学报》2024年第10期3477-3487,共11页CIESC Journal

基　　金：国家自然科学基金项目(52174234)。

摘　　要：为探究颗粒团聚体在分级机流场内的破碎规律,基于软球模型研究了涡流空气分级流场中团聚体破碎行为及组成团聚体的单颗粒粒径、单颗粒数和团聚体形状对团聚体破碎的影响。结果表明:团聚体进入分级流场后在流体曳力的作用下先发生变形随后破碎;颗粒越小,其组成的团聚体团聚性越强;球形团聚体团聚性最强,圆柱体团聚体次之,立方体团聚体团聚性最弱;组成团聚体的单颗粒数越多,其在分级流场中完全解团所需时间越长,当团聚体大到一定程度时可能无法完全解团则被收集为粗粉,导致“鱼钩效应”。因此,通过优化流场延缓团聚体沉降或对粉体原料预分散处理有利于团聚体解团。To probe into the fragmentation laws of particle aggregate in the flow field of the classifier.Based on the soft sphere model,the fragmentation behavior of aggregate in turbo air classification flow field and the effects of single particle size,single particle number,and shape of aggregates on aggregate fragmentation are studied.The results show that:aggregates undergo deformation and then fragmentation under the action of drag force after entering the classification flow field.The smaller the single particles,the stronger the agglomerates they form.Spherical aggregates have the strongest aggregation,followed by cylindrical aggregates,and cubic aggregates have the weakest aggregation.The more single particles that make up the agglomerates,the longer it takes for them to completely disagglomerate in the classification flow field.When the agglomerates are large enough,they may not be completely disagglomerated and are collected as coarse powder,resulting in the“fishhook effect”.Thus,completely fragmentation of aggregates can be promoted by optimizing the flow field to retard aggregates settling or pre-dispersion treatment for the raw materials.

关 键 词：涡流空气分级机 软球模型 破碎 计算流体力学 粉体 数值模拟 

分 类 号：TQ028.8[化学工程]