【摘要】 COREX-3000预还原竖炉内的煤气流分布直接影响着煤气利用率、直接还原铁的金属化率和炉料顺行,而炉顶布料制度是调节煤气流分布的主要手段.基于离散颗粒动力学原理,建立COREX-3000竖炉布料的DEM数值模型,确定了模型参数,并对布料过程中的颗粒速度变化和颗粒分布情况,以及形成料堆的料面形状和料堆结构进行了颗粒尺度的分析.模拟结果表明混装布料时,粒径小、密度大的矿物颗粒易于穿过表层的大粒径、密度小的燃料颗粒层,从而表现出在料堆的表层大颗粒富集.更多还原

【Abstract】 The distribution of reducing gas in the shaft furnace of COREX-3000 influences directly the gas utilization ratio,the metallization degree of directly reduced iron and the burden descent.The charging of burden is the main means for regulating the gas flow distribution.A mathematical simulation model of burden distribution for COREX-3000 shaft was developed by discrete element method,and the model parameters were determined.The change of particles velocity and particles distribution in the process of burden charging,as well as the surface profile and inner structure of the bed,were analyzed at particulate-scale.The simulation results show that the small radius,heavy mineral particles tend to go through the surface layer consisted of the light and large size of fuel particles,thus it seems to make large particles enriched in the surface of heap.更多还原