Analysis of Fluidized Rotary Bed in Countercurrent Reduction by Three-Interface Model

Abstract

Countercurrent reduction results by fluidized rotary bed have shown that gas utilization increased with the increase of the stage number or L/D value, which meant the countercurrent reduction should be established.
However, since the mean residence time of are measured was not equal and the countercurrent effect was different in each reactor, both the mean residence time factor and the countercurrent factor affect simultaneously the fractional reduction.
Thus, in this paper, in order to investigate only the effect of countercurrent on the fractional reduction, a single fluidized-bed-model including gas and are flow in the bed was developed with three-interface model and numerical computation was conducted for the three-staged reduction.
Under the assumption that gas flow is plug flow and are is complete mixing flow in a one-staged bed, fractional reductions computed from this model were in good agreement with observed one in each reactor.
Therefore the effect of countercurrent on the fractional reduction was estimated separately by this model.