高炉内炉料流动模式及力链分布的离散元模拟

基于离散元数值计算方法,建立了高炉内炉料颗粒尺度运动行为的数学模型,主要研究固体炉料的运动模式和颗粒间相互作用力链的分布.结果表明:建立的离散元模型计算获得了炉内颗粒间的介观力链结构,炉底中心部位存在强力链结构支撑高炉料柱,最强力链结构对应于死料柱区,而且离散元模拟也给出炉内固体料运动模式由四个区域构成,分别为死料柱区、活塞流区、准静态滑流区和沟流区,而沟流区的力链最弱.

Discrete Element Simulation of Flow Pattern of Burden and Distribution of Force Chains in Blast Furnace

The mathematical model based on the discrete element method was proposed to investigate the behaviors of solid particulate motion from particle-scale view,the burden flow pattern and the distribution of interaction force-chains between the particles.The results showed that the force networks of meso-scale structure in blast furnace are obtained by establishing the discrete element method(DEM) model.The strong force networks exist in the center of hearth and support the weight of charge column.The most strong chains zone corresponds to the deadman zone of blast furnace.The flow pattern of burden particles has four regions: deadman zone,piston flow zone,quasi-static slip flow zone and channel flow zone.The channel flow zone corresponds to the weakest force chain.