GONG Shuguang1, CHENG Qi1, DAI Bo2, XIE Guilan1, LIU Kejian2
(1. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;2. National Sintering and Pelletizing Equipment System Engineering Research Center, Changsha 410000, China)
Abstract: A CFD-DEM coupling simulation model was established and verified by experiments for the dust generation at the material inlet of strong mixing machine. The change law of the airflow induced by inlet was studied, the influence of falling height and mass flow on the airflow induced by inlet was analyzed and the dust generation mechanism of the inlet was revealed. The dust production characteristics of bentonite, ferric powder and their mixture (mass ratio of them is 1 ∶1) were compared. The results show that the gas-solid coupling process of material falling through the inlet is divided into three stages: vertical falling, extrusion collision and diffusion. The relationship between induced airflow velocity and material mass flow rate is a power function and the induced airflow velocity increases with the increase of mass flow rate. The power index ranges from 0.69 to 0.79, and the higher the blanking height, the larger the power index. Among the three materials, bentonite materials produce the most dust when falling.
Keywords: strong mixing machine; material inlet; CFD-DEM coupling model; induced airflow; dust generation mechanism
文章编号：1008-5548(2020)03-0046-07
DOI:10.13732/j.issn.1008-5548.2020.03.007
中图分类号：TB44 文献标志码：A
收稿日期： 2019-10-31，修回日期：2020-03-05，在线出版时间：2020-04-03 17:43。
基金项目：国家自然科学基金项目，编号：51475403。
第一作者简介：龚曙光(1964—)，男，博士，博士生导师，教授，研究方向为CAE技术的理论与应用研究。E-mail：gongsg@xtu.edu.cn。
