DIRECT REDUCTION OF HEMATITE IN A MOVING-BED REACTOR - ANALYSIS OF THE WATER GAS SHIFT REACTION EFFECTS ON THE REACTOR BEHAVIOR
DIRECT REDUCTION OF HEMATITE IN A MOVING-BED REACTOR - ANALYSIS OF THE WATER GAS SHIFT REACTION EFFECTS ON THE REACTOR BEHAVIOR
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DOI：
10.1021/ie00051a007
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发表时间：
1991-03-01
影响因子：
4.2
通讯作者：
CHIOVETTA, MG
中科院分区：
文献类型：
--
作者：
NEGRI, ED;ALFANO, OM;CHIOVETTA, MG
建立了利用混合还原气体直接还原铁氧化物的移动床反应器的数学模型。该反应器模型基于一维、非均质、非等温、稳态方案。球团模拟采用三个移动的还原前沿，在海绵铁层中发生水煤气变换反应(WGSR)。该反应防止了氢气与一氧化碳浓度比的下降，对竖炉的性能具有重要意义。考虑到高温和外层铁对WGSR的催化作用，后者在该区域内被认为是平衡的。将模型预测与没有副反应的三界面模型的预测结果以及中试装置规模反应堆的实验数据进行了比较。结论是，虽然两个模型都预测了实验信息中观察到的变化，但严格的(带有WGSR)模型更接近于工业运行范围内还原炉的行为。
A mathematical model of a moving-bed reactor for the direct reduction of iron oxides using mixtures of reducing gases is presented. The reactor model is based on a one-dimensional, heterogeneous, nonisothermal, steady-state scheme. Pellet modeling is performed by using three moving reduction fronts, with the water gas shift reaction (WGSR) taking place in the sponge-iron layer. This reaction, which precludes the dropping of the hydrogen to carbon monoxide concentration ratio, is of great importance for the performance of the shaft furnace. Given the high temperatures and the catalytic effects of the iron in the outer layer upon the WGSR, the latter is considered in equilibrium within this region. Model predictions are compared with those of a three-interface model with no side reactions and with the experimental data available in the literature for a pilot-plant-scale reactor. It is concluded that, although both models predict the variations observed in the experimental information, the rigorous (with WGSR) model more closely represents the behavior of the reducing furnace for the industrial operating range.