并罐式无钟炉顶装料行为的离散元模拟及实验研究  

DEM Simulation and Experimental Investigation of Burden Distribution in the Parallel-Hopper Bell-Less Top Blast Furnace

作　　者：邱家用[1] 张建良[1] 孙辉[1] 闫炳基[1] 李峰光[1] 国宏伟[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《应用数学和力学》2014年第6期598-609,共12页Applied Mathematics and Mechanics

基　　金：国家重点基础研究发展计划(973计划)(2012CB720401)~~

摘　　要：通过离散元模拟和物理实验相结合的方法研究了并罐式无钟炉顶装料过程中颗粒的流动行为.结果表明:DEM模拟能很好地再现实验结果;料罐内部颗粒间力的分布不均匀,强力链主要分布在料罐下部和斜墙附近;料罐内颗粒流动为偏斜式漏斗流,可分为准呆滞区、流动加速区、两侧墙壁附近的剪切层,料罐内颗粒流动模式影响着颗粒的排放顺序,并进一步影响颗粒的下落轨迹及其在炉内的分布;颗粒流动轨迹受料罐出口闸门开度的影响,为保证稳定布料,应将闸门开度控制在合理的范围内;颗粒堆积过程中,堆尖位置随着料流落点位置而变化,堆尖半径大于落点半径.The flow behavior of particles during the burden distribution process in the parallel- hopper bell-less top blast furnace was investigated with the discrete element method （DEM） as well as a model experiment. It is shown that the DEM simulation results agree with the experi- mental results well. The contact force distribution in the hopper is nonuniform, i.e., the strong force chains mainly locate in the lower part of the parallel-hopper and in the vicinity of the in- cllned wall. The flow pattern in the parallel-hopper resembles a deflective funnel flow which comprises the quasi-stagnant zone, the central accelerated flow zone and the wall shear layer. Both the particle falling trajectory and distribution are related to the discharging sequence which is affected by the flow pattern in the hopper. As the flow trajectory is influenced by the opening of the flowgate, it should be controlled within a reasonable range for the stability of burden dis- tribution. The heap peak position varies with the falling point during the heaping process, and the peak radius is larger than that of the falling point.

关 键 词：高炉 无钟炉顶 离散元法 装料行为 颗粒流 力链 

分 类 号：TF512[冶金工程—钢铁冶金]