Effect of Ore Contraction behavior on Permeability of Cohesive Zone during Ore Softening

抄録

In recent years, it is necessary to reduce CO₂ emissions from the blast furnace, due to prevent global warning. Therefore, low coke ratio operation is required to reduce coke consumption in ironmaking process.

On the other hands, because coke works as a spacer in the blast furnace, low coke rate operation causes various problems, including deterioration of furnace permeability and delay of reduction reaction. Iron ore with low reduction ratio also expects to cause the deterioration of permeability, this is because FeO-containing slag promotes softening and melting of iron ore. Therefore, it is important to quantify the effect of ore melting behavior on permeability.

In this study, the effect of ore contraction behavior on permeability of cohesive zone was quantified by using the cohesive zone simulator, focusing on the difference in contraction behavior due to the difference in reduction ratio. In addition, the effect of ore contraction ratio on the permeability of blast furnace was estimated by the numerical simulation model.