Effect of DEM Parameters on the Simulated Inter-particle Percolation of Pellets into Coke during Burden Descent in the Blast Furnace
Effect of DEM Parameters on the Simulated Inter-particle Percolation of Pellets into Coke during Burden Descent in the Blast Furnace
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DOI：
10.2355/isijinternational.52.788
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发表时间：
2012-05
影响因子：
1.8
通讯作者：
Yaowei Yu;H. Saxén
中科院分区：
文献类型：
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作者：
Yaowei Yu;H. Saxén
高炉料层之间界面处的颗粒间渗流影响块状区的渗透率，特别是粘结区的渗透率，在那里含铁材料开始软化并最终熔化。本文模拟研究了高炉下料过程中颗粒性质对小颗粒(球团)向大颗粒(焦炭)层渗流的影响。利用小型扩容实验装置模拟了半径不断增大的竖井中的落矿情况，并将实验结果作为模拟和验证计算结果的参考。模拟基于离散元方法，研究了摩擦系数、恢复系数、剪切模数以及颗粒直径等因素对颗粒渗流程度的影响。结果表明，焦炭形状、颗粒直径、静摩擦力、颗粒间滚动摩擦和回复率对渗流有显著影响，而装置膨胀率、颗粒密度和剪切模数对渗流影响较小。
Inter-particle percolation at the interface between the burden layers in the blast furnace influences the permeability in the lumpy zone, and, in particular, in the cohesive zone, where the iron-bearing materials start softening to finally melt. This paper presents a simulation study of the effect of particle properties on inter-particle percolation of small particles (pellets) into a layer of larger particles (coke) during burden descent in the blast furnace. An expanding experimental device in small scale was applied to mimic the conditions at burden descent in a shaft with growing radius, and results from these experiments were used as a reference for the simulations and to validate the computational results. The simulations, which were based on the discrete element method, studied the effect of factors such as friction and restitution coefficients, shear modulus, as well as pellet diameter on the extent of percolating particles. It was found that coke shape, pellet diameter, static friction and inter-particle rolling friction and restitution had a marked effect on the percolation, while rate of expansion of the device, density of pellet and shear modulus proved to be of minor importance.