回转筒内沙石物料混合均匀性的数值模拟

采用离散单元法对回转筒内沙石物料的混合均匀性进行数值模拟研究,并选取回转筒转速、直径、提升条个数和石子填充率作为影响因素,分别设立3个水平,进行回转筒内物料混合的正交模拟,旨在对各因素的敏感性影响程度进行分析。基于试验结果选择物料混合时间和颗粒接触数率作为试验指标,对四个因素进行极差分析和方差分析。结果表明,回转筒转速、直径和石子填充率对物料混合时间的影响显著,提升条个数对混合时间的影响不显著;石子填充率、回转筒转速和提升条个数对物料混合后颗粒接触数率的影响显著,回转筒直径对物料混合后颗粒接触数率的影响不显著。

Numerical simulation of mixing uniformity of sand and gravel in rotating drum

The discrete element method (DEM) is used to numerically simulate the mixing uniformity of sand and gravel materials in rotating drums.The rotational speed of the drum,the diameter of the rotating drum,the number of lifters in the rotating drum and the filling rate of gravels were selected as the influencing factors,and three levels were established to carry out orthogonal experimental research on material mixing in the rotary drum,aiming at analyzing the degree of sensitivity of each factor.The material mixing time and the particle contact rate were selected as test indicators,and four factors were subjected to range analysis and variance analysis.The results show that the rotational speed of drum,the diameter of the rotating drum and the filling rate of gravel have a significant influence on the mixing time of the material,and the effect of the number of lifters in the rotating drum on the mixing time is not significant.And the influence of the filling rate of gravels,the rotational speed of the drum and the number of the lifters in the rotating drum on the particle contact rate after mixing is significant,and the diameter of the rotating drum has no significant effect on the particle contact rate after mixing.