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针对某高炉多粒径颗粒并罐装料过程中料罐内颗粒存在的粒度偏析现象,采用离散单元法(DEM)对其装料行为进行了数值模拟研究。数值结果表明:由于并罐式无料钟装料装置的特殊结构导致了左右料罐内存在不同的颗粒粒度偏析。其中,左罐中自左至右呈现出大、小、小、大的颗粒粒度偏析分布,而右罐中自左至右呈现出小、小、大、大的颗粒粒度偏析分布,且两料罐中料堆堆尖处都呈现小颗粒分布居多,大颗粒分布较少的偏析现象,模拟结果与文献报道装料结果十分吻合。最后,进一步分析了不同区域内的相对平均粒径及偏析指数分布。
Aiming at the particle size segregation existing in the material tank during the multi-particle size and tank filling process of a blast furnace, the loading behavior was numerically simulated by the discrete element method (DEM). The numerical results show that due to the special structure of the tankless bell-shaped charging device, different grain size segregation exists in the left and right material tanks. Among them, from left to right left cans show a large, small, small and large particle size segregation distribution, while the right cans from left to right showing small, small, large and large particle size segregation distribution, and two In the cans, the heap segregation phenomenon with small particle size distribution and large particle size distribution appears at the tip of the pile. The simulation results are in good agreement with those reported in the literature. Finally, the relative average particle size and segregation index distribution in different regions were further analyzed.