摘要
为探究干法造粒过程造粒室内圆柱形挡板数目对粉体混合效果的影响。采用多重参考坐标系法与滑移网格法模拟造粒室的旋转,采用修正后的欧拉-欧拉双流体模型分析气固两相间相互作用,造粒室内湍流状态使用k-εRNG离散模型进行求解,根据颗粒体积分布及颗粒流速场探究不同挡板数目对粉体混合过程的影响。结果表明:当挡板数目为0时,过多的固体回转区严重影响粉体互相混合;当挡板数目为2时,颗粒速度及体积分数分布均匀,但继续增加挡板数目则会降低颗粒速度,并加重挡板间的颗粒堆积,使颗粒局部涡流变大,造成混合不均。实验验证了数值仿真的正确性,当挡板数目为2时,有效颗粒含量占比91%,颗粒级配最佳。所建模型及仿真结果能够有助于加深对造粒室内流场特性的了解,并对其结构的优化有一定的指导意义。
In order to explore the mixing effect of the baffles'number in ceramic dry granulator,multi-reference coordinate system and slip grid method were used to simulate the rotation of granulation chamber.The interaction between gas and solid phases were simulated by modified Euler-Euler model,the turbulence were solved by the k- RNG discrete model.The influence of the baffles'number on the mixing process was studied by the distribution of particles size and particles velocity field.Results showed:when the number of baffles was 0,too much solid swirling zone seriously affects the mixing of the powders;when the number of baffles was 2,particles velocity and volume fraction distribution was uniform,but increased the baffles would decrease the particle velocity,increased the accumulation and local vortices of particles,which caused a bad particles mixing effect.The correctness of the numerical simulation was verified by experiments,when the number of baffles was 2,effective particles content accounted for 91%,particle gradation was optimal.The model and the simulation results could help to deepen the understanding of the characteristics of the flow field in granulation chamber and it had certain guiding significance to the optimization of its structure.
作者
陈涛
宁翔
赵增怡
刘玉涛
廖达海
CHEN Tao;NING Xiang;ZHAO Zengyi;LIU Yutao;LIAO Dahai(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2018年第12期65-70,共6页
China Ceramics
基金
国家自然科学基金(51365018)
