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Inter-particle Percolation Segregation during Burden Descent in the Blast Furnace

机译：高炉炉膛下降过程中的颗粒间渗流偏析

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Inter-particle percolation at the interfaces between burden layers directly influences the permeability of the burden in the shaft of the blast furnace. This paper studies inter-particle percolation of small particles (pellets) into large particles (coke) during the burden descent through small-scale experiments and simulations. A special device was designed for making it possible to consider the effect of the increase in cross-sectional area along with the burden descent. The simulations, which are based on the discrete element method, were first validated using one experimental case. An overall agreement was found between the experiments and the simulations. The velocity distribution of coke and pellet particles in the small bed, the trajectories along the height of the bed and the quantity of percolating particles at different heights of bed were investigated. The results show a considerable inter-particle percolation of pellets into the underlying coke layer at the wall area, but also a percolation over the whole radius of the system. These findings stress the importance of taking measures to prevent percolation by proper design of the charging programs in the operation of the blast furnace.
机译：物料层之间的界面处的颗粒间渗滤直接影响物料在高炉竖井中的渗透性。本文通过小规模实验和模拟研究了负荷下降过程中小颗粒（小丸）到大颗粒（焦炭）的颗粒间渗滤。设计了一种特殊的设备，可以考虑增加横截面面积以及减轻负担。基于离散元素方法的仿真首先使用一个实验案例进行了验证。在实验和模拟之间找到了总体共识。研究了小床中焦炭和颗粒颗粒的速度分布，沿床高度的轨迹以及不同床高度的渗滤颗粒数量。结果表明，颗粒在壁区域的相当大的颗粒间渗入到下面的焦炭层中，但是在整个系统半径上也有渗滤。这些发现强调了在高炉操作中采取适当的装料程序设计措施以防止渗滤的重要性。

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