The reduction behavior of iron ore is the fundamental process in ferrous metallurgy. Considering the gas–solid interface-structure relationship, heterogeneous transfer-reaction behavior, and multiple reaction kinetics, this work provides an effective analytical tool to investigate the fluidized reduction of iron ore. The conical fluidized bed is numerically examined to be capable of preventing de-fluidization induced by the sticking behavior, due to the steady circulation of flow pattern and full fluidization of coarse agglomerates. Compared with the hydrogen concentration, the gas velocity shows a stronger influence on the agglomerate reduction rate for the more efficient gas–solid contact. For the simulated transitions of FeO → FeO → FeO → Fe are assumed to overlap each other, there exist discrepancies between computed and theoretical reduction degrees. The experimental and numerical findings can be used to develop a methodology for optimizing the operational complexity and economic benefits of the fluidized reduction of iron ore.

中文翻译：

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锥形流化床直接还原铁矿石的实验研究及CFD研究


铁矿石的还原行为是黑色冶金的基本过程。考虑到气固界面结构关系、非均相转移反应行为和多重反应动力学，这项工作为研究铁矿石流态化还原提供了有效的分析工具。通过数值检验，由于流型的稳定循环和粗团块的充分流化，锥形流化床能够防止由粘着行为引起的反流化。与氢气浓度相比，气体速度对附聚物减少率的影响更大，从而实现更有效的气固接触。由于假设 FeO → FeO → FeO → Fe 的模拟转变相互重叠，因此计算的还原度与理论的还原度之间存在差异。实验和数值结果可用于开发一种优化铁矿石流态化还原操作复杂性和经济效益的方法。