复合振动筛筛分煤颗粒的离散元模拟研究  

Discrete element simulation of coal particles screening on composite vibrating screen

作　　者：杨华瑞 马学东[1] 赵轩瑾 王晓川 宋梅雪 YANG Huarui;MA Xuedong;ZHAO Xuanjin;WANG Xiaochuan;SONG Meixue(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114013,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114013

出　　处：《煤炭工程》2024年第4期192-198,共7页Coal Engineering

基　　金：国家自然科学基金面上项目(51775258);辽宁省自然科学基金重点项目(20170540458);精密与特种加工教育部重点实验室基金(B201703)。

摘　　要：为了强化混合颗粒在筛面的分层,提高传统振动筛的筛分效果。依据混合颗粒在振动下的空隙填充效应,并基于Lissajous振动合成理论,提出了一种复合振动筛。解释了复合振动筛理论基础和工作原理,并使用离散元方法进行了验证。以复合、直线、椭圆和圆振动筛为对象,以频率、振幅和振动方向角为变量,进行了传统振动筛和复合振动筛离散元模拟对比研究,结果表明:复合振动筛在筛分效率和物料处理两方面均具有较大优势。复合振动筛可以传递给颗粒一个沿筛面宽度方向的激振力,颗粒在xyz三个方向均有激振力的作用,颗粒受力更加多样化,混合颗粒体系更加松散,活跃程度更大,分层效果更好,进而复合振动筛可以取得更为理想的筛分效果。In order to strengthen the stratification of mixed particles on the screen surface and improve the screening effect of traditional vibrating screens.According to the void-filling effect of mixed particles under vibration and based on the Lissajous vibration synthesis theory,a composite vibrating screen was proposed.The theoretical basis and working principle of the composite vibrating screen were explained and verified using the discrete element method.A comparative study of conventional vibrating screen and composite vibrating screen discrete element simulation was carried out with composite,linear,elliptical and circular vibrating screens with frequency,amplitude and vibration direction angle as variables,and the comparison results showed that the composite vibrating screen has more significant advantages in both screening efficiency and material handling.A composite vibrating screen can give the particle force along the width of the screen surface,and the excitation force acts on particle in the three directions along the xyz axles;the particle force is more diversified,the mixed particle system is looser,more active,leading to better stratification effect and ideal screening effect.

关 键 词：复合振动筛 煤 DEM模拟 空隙填充效应 Lissajous振动合成 筛分效率 

分 类 号：TD94[矿业工程—选矿]