Analysis of CO Reduction of Hematite Pellets in an Isothermal Fixed Bed by Multi-interface Model

Abstract

Reduction experiments of hematite pellets with CO in an isothermal fixed bed were carried out under various experimental conditions. The pellets used were made of pyrite cinder and their porosity was approximately 15%.
The equation of continuity for CO reduction of pellets in an isothermal fixed bed was numerically solved by the application of the multi-interface model to describe the reduction rate of the pellets where parameters obtained previously by the technique of step-wise reduction of the pellets were used. Agreement between the calculated curves and observed data was satisfactory.
In the experiments it was observed that pellets in the vicinity of the tube wall were reduced more or less rapidly than in the central part of the tube. The wall was found, however, to have a small effect on the calculated results of the average fractional reduction of the bed and exit gas concentration.