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Synopsis : The effect of water gas shift reaction on the reduction was investigated theoretically and experimentally in the fixed bed reduction of wustite pellets with H2-CO and H2-CO2 gas mixtures at 900 °C. In the model analysis, the water gas shift reaction, the effect of high void fraction in the peripheral part of the fixed bed next to the reaction tube wall on the gas flow, the effect of the gas composition on the parameters, the oxygen diffusion in the dense iron layer, and the heat of reactions were taken into account. Following results were obtained ; 1) The calculated results by the present model agreed well with the observed data of fractional reduction, gas composition and temperature. 2) In the reduction with H2-CO, the effect of water gas shift reaction on the reduction curves was not so significant. However, the temperature in the bed was lowered slightly by the effect of heat of the reaction. 3) In the reduction with H2-CO2, the effect of water gas shift reaction on the reduction became significant with an increase of CO2 composition in the inlet gas. The temperature in the bed was lowered remarkably.

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Effect of Water Gas Shift Reaction on the Reduction of Wustite Pellets in a Fixed Bed with H2-CO and H2-CO2 Gas Mixtures