Moving-Bed Reactor Model for the Direct Reduction of Hematite. Parametric Study
Moving-Bed Reactor Model for the Direct Reduction of Hematite. Parametric Study
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DOI：
10.1021/ie00039a017
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发表时间：
1995-12
影响因子：
4.2
通讯作者：
E. D. Negri;O. Alfano;M. G. Chiovetta
中科院分区：
文献类型：
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作者：
E. D. Negri;O. Alfano;M. G. Chiovetta
通过对同一作者先前提出的数学模型预测结果的参数化研究，分析了从赤铁矿中生产海绵铁的直接还原移动床反应器的行为。球团尺度模型是基于一种三移锋方案来还原各种氧化铁，它包括在海绵铁层平衡的水气转移反应（WGSR）。反应器采用一维、非均相、绝热、稳态模型进行建模。针对传统打靶法存在的稳定性问题，采用一种新的解法得到了该问题方程组的数值解。比较了考虑WGSR和不考虑WGSR的模型的结果。包含WGSR的完整模型所得到的结果与简单模型所得到的结果相比具有显著的优势。完整的模型可以准确地表示中试反应堆，包括检测最佳运行条件区域的能力。
The behavior of a direct-reduction, moving-bed reactor for the production of sponge iron from hematite is analyzed through the parametric study of the predictions obtained from a mathematical model previously presented by the same authors. The pellet-scale model is based on a three-moving-front scheme for the reduction of the various iron oxides, and it includes the water gas shift reaction (WGSR) in equilibrium in the sponge-iron layer. The reactor is modeled through a one-dimensional, heterogeneous, adiabatic, steady-state model. The numerical solution of the system of equations representing the problem is obtained by means of a novel solution scheme, since the conventional shooting method presented stability problems. Results from the models with and without inclusion of the WGSR are compared. The results obtained with the complete model that includes the WGSR introduce a significant advantage with regard to those brought about by simpler models. The complete model permits an accurate representation of pilot-plant reactors, including the ability to detect regions of optimal operating conditions.