Gas–solid flow in an ironmaking blast furnace — I: Physical modelling
Gas–solid flow in an ironmaking blast furnace — I: Physical modelling
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DOI：
10.1016/j.powtec.2010.12.006
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发表时间：
2011-03
影响因子：
5.2
通讯作者：
B. Wright;P. Zulli;Zongyan Zhou;A. Yu
中科院分区：
文献类型：
--
作者：
B. Wright;P. Zulli;Zongyan Zhou;A. Yu
通过对高炉气固两相流的实验研究，探讨了高炉气固两相流的二维狭缝模型与三维狭缝模型、正常操作与非正常操作、球形颗粒与非球形颗粒等问题。在可比条件下，2D槽和全3D模型之间的定量比较表明，虽然两种模型中的关键固体流动特征相似，但模型炉中不同流动区的相对尺寸差异很大。在2D和3D模型中检查了操作参数对流动行为的影响，包括气体和固体流速、颗粒粗糙度和形状等材料特性以及不对称带电和结痂等异常条件。结果表明，在二维槽缝模型中，滞止区受气固流速的影响较大，而在三维模型中则不受影响。具有角形状和高内部摩擦角的颗粒产生停滞区的陡峭轮廓。不同材料层和均匀混合材料的固体流动行为是相似的。非对称流动实验研究表明，在二维槽模型中，一侧的流动行为在很大程度上与另一侧的流动无关。结疤的存在导致壁面上的流动延迟，并且层取向从水平变为垂直。这些结果不仅有助于进一步了解高炉内固体流动，而且有助于验证不同的数学模型，特别是在文献中越来越多地使用的离散颗粒模拟。
The paper presents an experimental study of gas–solid flow in an ironmaking blast furnace under various conditions to address a few important issues: two-dimensional (2D) slot model vs full three-dimensional (3D) model, normal vs abnormal operations, and spherical vs non-spherical particles. The quantitative comparisons made between the 2D slot and the full 3D models under comparable conditions reveal that whilst the key solid flow features are similar in both models, the relative sizes of the different flow zones in a model furnace differ considerably. The effects of operational parameters on the flow behaviour are examined in both 2D and 3D models, including gas and solid flow rates, material properties such as particle roughness and shape, and abnormal conditions such as asymmetric charging and scabs. It reveals that the stagnant zone is significantly affected by gas and solid flow rates in the 2D slot model, but not in the 3D model. Particles with angular shapes and a high internal angle of friction produce steep profiles of the stagnant zone. The solid flow behaviour with layers of different materials and a homogeneous mix of materials are similar. Studies in asymmetric flow experiments reveal that the flow behaviour on one side is largely independent of the flow on the other side in the 2D slot model. The presence of scabs causes retardation of the flow on the wall, and the layer orientation changing from horizontal to vertical. The results are useful not only in developing further understanding of solid flow in a BF but also in verifying different mathematical models, particularly the discrete particle simulation which has been increasingly used in the literature.