Abstract
The CO reduction of hematite pellets in an isothermal moving bed was studied theoretically as well as experimentally.
Various models for the process analysis of the isothermal moving bed were constructed for the steady and the unsteady state by regarding or disregarding the wall effect. The rate equation based on the multiinterface model and the rate parameters determined by the technique of step-wise reduction of a single hematite pellet were used in the analysis.
The results are summarized as follows;
1) It was found that the multi-interface model with rate parameters obtained by step-wise reduction may be used for the process analysis of a moving bed reactor.
2) Calculated results based on the models in which the wall effect was properly taken into account showed agreement with experimental results as to exit gas composition and the axial distribution of fractional reduction.
3) The wall gave noticeable effects on the exit gas composition at higher descending velocity of the pellets and on the axial distribution of fractional reduction at lower descending velocity.
