酸化鉄ペレットの還元速度に寄与する収支抵抗の実験的検討

概要

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Single basic hematite-pellets (porosity 24%) are reduced in two reactors of 54 and 156 mm I.D. over a temperature range from 600° to 1000℃ and a flow-rate range 0.1 to 20 Nl/min. In the initial stage of reduction, hydrogen is diluted by nitrogen which flows through a reactor until it reaches a set temperature, and the reaction retards especially at low flow rates. In the course of reduction, hydrogen is also diluted by the product gas (H_2O). For these dilution processes, the dispersion model has been introduced into the unreacted-core shrinking model for one interface in consideration of the resistance due to the rate of gas flow proposed by Clair. Contribution of this resistance, denoted by κ(0≦κ≦1, κ=0 and 1 imply the analyses without and with the resistance proposed by Clair, respectively), is examined by comparing calculated reduction curves with experimental ones : The value of κ increases as the flow rate decreases. With appropriate selection of kinetic constants, the modified model produces a greatly improved fit to experimental data.
社団法人日本鉄鋼協会の論文
1981-09-01