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首页> 外文期刊>ISIJ international >Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H_2-CO Mixtures
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Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H_2-CO Mixtures

机译：水煤气变换反应对H_2CO混合气还原氧化铁粉末填充床的影响

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摘要

Although the hydrogen reduction is thermally more disadvantageous than the CO reduction, it is advantageous that the reduction rate with H_2 is much larger than that with CO. In order to examine the effective use of hydrogen, the reduction of FeO_(1.05) powder packed bed with H_2-CO mixture was conducted, and the results were analyzed by a proposed model. The temperature, at which the reduction equilibria of FeO_(1.05) with H_2 and CO equal, is determined to be 1 093 K from the present results. The apparent rate constants are determined to be 33, 8.6 and 15 for the reduction of FeO_(1.05) with H_2, CO and H_2-CO mixture (/_(H_2):V_(CO) = 1:1), respectively. In the proposed model, when the water-gas shift reaction is taken into account, the additivity is established on the dependence of the rate constant of the reaction on the gas composition. When the water-gas shift reaction is not taken into account, the rate constant deviates negatively from the additivity. The apparent rate constants of the reduction determined in the present study take the middle values, and the contribution of the water-gas shift reaction is estimated to be 3 % against its equilibrium. In reducing FeO_(1.05) with CO, the time when the sample is perfectly reduced is shortened by adding a small amount of H_2, and the rate enhancement effect of H_2 on the gaseous reduction remarkably appears at 1 093 K. The effect originates in the proceeding of the water-gas shift reaction.
机译：尽管氢还原在热方面比CO还原更不利，但H_2的还原速率远大于CO的还原速率是有利的。为了检验氢的有效利用，FeO_（1.05）粉末填充床的还原用H_2-CO混合气进行反应，并通过提出的模型对结果进行分析。根据目前的结果，确定FeO_（1.05）与H_2和CO相等时的还原平衡温度为1093K。确定用H_2，CO和H_2-CO混合物（/ _（H_2）：V_（CO）= 1：1）还原FeO_（1.05）的表观速率常数分别为33、8.6和15。在提出的模型中，当考虑水煤气变换反应时，根据反应速率常数对气体成分的依赖关系建立可加性。当不考虑水煤气变换反应时，速率常数与加和性成负向偏离。在本研究中确定的还原反应的表观速率常数取中间值，相对于其平衡，水煤气变换反应的贡献估计为3％。用CO还原FeO_（1.05）时，通过添加少量H_2可以缩短样品完全还原的时间，并且H_2对气态还原的速率增强作用显着出现在1 093 K处。水煤气变换反应的进行。

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