新型DRI-挡板布料器布料过程的数值模拟

Numerical Simulation on the Charging Process of New DRI-Flap Distributor

COREX熔化气化炉炉顶布料设备由煤-溜槽和DRI-挡板两种布料器组成,其中DRI-挡板属于新型布料器,布料规律尚不明晰.通过离散单元法(DEM)建立了DRI-挡板布料过程的数学模型,通过该模型分析了DRI-挡板的操作参数对布料过程带来的影响.其中包括考察了挡板角度对布料落点位置的影响,获得了布料档位与挡板角度的对应关系.还考察了料堆的形成过程和单一物质多粒度混合布料形成的料堆内部偏析情况,获得了不同档位半径物料的粒度偏析信息.同时也考察了矿石和焦炭混合布料过程,获得了矿焦的径向分布规律.研究结果为COREX现场合理调节布料模式提供参考依据.

The charging system of COREX melter gasifier consists of one coal-gimbal distributor and eight DRI-flap distributors. As the DRI-flag distributor is a new type of distributor, few research is found to help to understand the charging process of DRI-flap distributor in depth. In this study, a mathematical model of charging process of the DRI-flag distributor was developed based on discrete element method and was used to investigate the effect of operating parameters during charging process. The relationship between the flap angle and radial position was obtained when studying the effect of flap angle on the landing position. After examing the formation process and internal segregation of the stock pile, the size segregation in the radial direction was revealed. Meanwhile, the distribution of ore and coke in the radial direction was given during their mixture charging process. These modeling results can guide us to adjust charging mode in COREX production field.