WANG Xin, YAO Yan, XU Qing, LI Zhanyong

(College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China)

Abstract: The purposes of this paper were to study the factors which affected the coating characteristics in hot-melt fluidized bed and further to optimize its the coating process. The computational fluid dynamics (CFD) and discrete element method (DEM) were used to simulate the contact process between droplets and powders at four fluidization velocities (umf, 1.5umf, 2.5umf, 3.5umf). Through the coupling of CFD and DEM, the effects of parameters changes during the coating process in hot-melt fluidized bed on the coating process were studied. The results show that the droplets are more fully contacted with the powders under the condition of top spray fluidized bed rather than the middle spray. When the droplets contacting with the powders, the combination of the particles and the droplets causes the phenomenon of aggregation and breakage. The optimal condition is 1.5 umf in this study for the performance of coating.

Keywords: hot-melt fluidized bed; coating; discrete element method (DEM)

中图分类号：TQ026.7

文献标志码：A

收稿日期： 2018-07-09，修回日期：2018-11-18，在线出版时间：2019-01-10 09:53。

基金项目：国家自然科学基金项目，编号：21506163；31571906。

第一作者简介：王新(1993—)，女，硕士研究生，研究方向为粉体工程。E-mail：970742713@qq.com。

通信作者简介：徐庆(1983—)，男，博士，讲师，硕士生导师，研究方向为粉体技术与装备、流态化技术。E-mail：xuqing@tust.edu.cn。

文章编号：1008-5548(2019)02-0006-06

DOI:10.13732/j.issn.1008-5548.2019.02.002