Abstract

The porosity distribution of burden layers in the blast furnace (BF) plays an important role for the gas distribution and gas–solid two-phase interaction. In this work, the porosity distribution along the radial and vertical directions of the BF throat was studied by the discrete element method combined with some experimental verification. The simulated radial porosity distribution of coke burden layer shows general agreement with experimental findings, which in practice depends on the charging matrix. When a layer of burden moves from the top to the bottom, its structure will become more compact, so the porosity will decrease. However, the changes occur while 4–5 new layers are built on top of the layer in question, after which the porosity stabilized at an equilibrium point. For the full burden bed, the porosity of coke layers is larger than that of ore layers, but both layers have larger porosity than mixed layer formed by sinter charged on coke, especially when the particle size difference between ore and coke is large.

Graphic abstract

中文翻译：

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高炉咽喉中运动负荷层的孔隙度分布

摘要

高炉（BF）中炉料层的孔隙度分布对于气体分布和气固两相相互作用起着重要作用。在这项工作中，通过离散元方法结合一些实验验证研究了高炉喉管沿径向和垂直方向的孔隙度分布。焦炭负荷层的模拟径向孔隙率分布与实验结果基本吻合，在实践中取决于装料矩阵。当一层重物从顶部移动到底部时，其结构将变得更紧凑，因此孔隙率将降低。但是，当在相关层的顶部新建4-5个新层时，会发生变化，此后孔隙率稳定在一个平衡点。对于全包床

图形摘要