抄録
A mathematical model for the process of direct reduction of iron ore (DRI Process) by rotary kiln has been developed to predict the axial distribution of process variables for Case 1 (i.e., the case with the feedings of auxiliary air and carbonaceous materials along the axis of the kiln) and for Case 2 (i.e., the case without these feedings).
Direct reduction of hematite by solid carbon, combustion of coal or coke in the solid bed, combustion of heavy oil in the freeboard which is fed from burner and combustion of CO evolved from the bed are taken into account together with the heat and mass transfer processes.
Applicability of the model has been verified by comparison of the calculated results of fractional reduction or solid-bed temperature with the experimental results obtained by the other investigators. The model has been applied to investigate the effects of the flow-rate ratio of solid to gas and that of carbon to ore on the axial distribution of process variables.
