SUN Hanlin, FANG Haifeng, LIU Rui, RONG Zheng, XU Juncheng

(College of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

Abstract：The drying of silicon material is one of the most important parts of the automatic ultrasonic cleaning machine in the production process. The study of the drying process of silicon material particles in the work basket drying cylinder in this link is of great significance for the energy saving of the drying device and the optimization of the work basket drying cylinder structure. Through DEM discrete software, the mixing process of granular silicon in drying cylinder of tooling basket was numerically simulated and analyzed under the influence of shapes and numbers of agitators, the rotating speed of the outer frame of drying cylinder and the fill-rate of granular polysilicon. The quantitative analysis of mixing uniformity was conducted with the use of univariate and multi-factor orthogonal experimental simulations and Lacey index M to obtain the optimal working conditions of each parameter. The results show that the mixing granules in dryer of the rectangular plate has the best effect compared with other shaped agitators. It is found that the mixing degree reached the optimal value when there are 6 agitators. The granules swarm mixing effect decreases as the increase of fill rate. Compared with the filling rate of 31.73% and 41.40%, the filling rate of 23.60% has the strongest impact on convection mixing effect, as well as better mixing effect. The drying drum speed of 8.91 rad/s can not only improve uniformity and quality of polysilicon particle mixing quality, but also improve mixing efficiency. Through orthogonal analysis, among all the influencing factors, the speed of outer frame of drying drum has the greatest influence, the particle filling rate is the second, the number of agitators is the third, and the shape of agitator has the least effect.

Keywords：tooling basket drying cylinder; silicon material; particle motion; numerical simulation

Get Citation：SUN H L, FANG H F, LIU R, et al. Numerical simulation of mixing process of silicon particles in drying cylinder of tooling basket[J]. China Powder Science and Technology, 2023, 29(4): 22-35.

DOI：10.13732/j.issn.1008-5548.2023.04.003

Received：2022-10-20,Revised：2022-12-21,Online：2023-05-19 10:15。

Funding Project：国家自然科学基金项目,编号:51906091;江苏省青蓝工程人才项目,编号:202126601。

First Author：孙撼林(1996—),男,硕士研究生,研究方向为仿真优化。E-mail: 1755505374@qq.com。

Corresponding Author：刘锐(1988—),男,副教授,博士,研究方向为流体力学传热传质多相流。E-mail: 745547903@qq.com。