烧结矿颗粒DEM参数的测定与标定  

Determination and calibration of DEM parameters for sinter particles

作　　者：陈彤 张晟 赵亮 冯军胜 董辉 CHEN Tong;ZHANG Sheng;ZHAO Liang;FENG Junsheng;DONG Hui(School of Metallurgy,Sep Key of Laboratory of Eco Industry,Northeastern University,Shenyang 110819,Liaoning,China;School of Environment and Energy Engineering,Anhui Jianzhu University,Hefei 23060l,Anhui,China)

机构地区：[1]东北大学冶金学院,国家环境保护生态工业重点实验室,辽宁沈阳110819 [2]安徽建筑大学环境与能源工程学院,安徽合肥230601

出　　处：《钢铁研究学报》2023年第1期24-32,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51974087,51904074)。

摘　　要：为了获取烧结矿颗粒在离散元法中所涉及的关键运动参数,通过实验确定了不同粒径范围的颗粒密度、弹性模量、泊松比、弹性恢复系数以及静摩擦因数。基于Hertz-Mindlin接触模型,通过实验和离散单元法仿真对比堆积的静止角,得到了适用于球形颗粒模拟状态下,烧结矿的滚动摩擦因数。结果表明:烧结矿密度、弹性模量及颗粒间动摩擦因数与粒径大小近似正线性相关;颗粒间弹性恢复系数与静摩擦因数随粒径增大逐渐减小。通过转鼓实验,对比了混合粒径状态下模拟和实验形成的自由表面,表明实验结果与计算结果吻合较好,误差在5%以内,进而表明所测离散单元参数准确程度较高,可用于后续烧结矿布料及余热竖罐内下移的模拟研究。In order to obtain the key motion parameters of sinter particles involved in the DEM(Discrete Element Method), the particle density, elastic modulus, Poisson′s ratio, elastic recovery coefficient and static friction coefficient of different particle size range were determined through experiments. Based on the Hertz-Mindlin contact model, the dip angles of the piles were compared between experiments and DEM simulations. The rolling friction coefficients of sinter particle applicable to the simulated state of spherical particles were obtained. The results show that the density, elastic modulus and inter-particle dynamic friction coefficient of sinter particles are positive correlated with particle size. The inter-particle elastic recovery coefficient and static friction coefficient gradually decrease with increasing particle size. Through the drum experiment, the simulated and experimental free surfaces in the mixed particle size state were compared, which shows that the calculated results are in good agreement with the experimental results, within 5% error. It indicates that the measured DEM parameters have sufficient validity to be used in subsequent simulation studies of the particle distribution and decline in the sinter waste heat vertical tank.

关 键 词：烧结矿 离散单元法 力学参数 粒径分布 颗粒形状 

分 类 号：TF046[冶金工程—冶金物理化学]