ウスタイトペレットの H_2-CO-CO_2 及び H_2-CO_2 混合ガスによる還元

概要

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The applicability of the reduction model proposed in the previous paper (Tetsu-to-Hagane, 73 (1987), p.972), in which the water-gas shift reaction and multi-component gas diffusion were taken into account, to the reduction kinetics of wustite pellets with H_2-CO-CO_2 and H_2-CO_2 gas mixtures was examined. The gas composition was such that the reduction was possible to take place not with CO-CO_2 but only with H_2. In the calculation, the parameters included in the model were modified depending on the gas composition by using the method proposed in the previous paper. The following results were obtained ; 1) The reduction curves calculated by the model agreed well with the observed data except the case of lower H_2 concentration. 2) The effect of the water-gas shift reaction was not so significant on the reduction curves, but it was remarkable on the mass transfer rate of each component of gas mixture. 3) Depending on the reduction condition, especially at higher H_2 concentration, CO/CO_2 ratio in the pellet increased because of the water-gas shift reaction. As a result, the reduction of wustite with CO took place instead of the oxidation of reduced iron with CO_2.
社団法人日本鉄鋼協会の論文
1988-11-01