Analysis of rate of hydrogen reduction of porous wustite pellets basing on zone-reaction models.

Porous wustite pellets were reduced with hydrogen at 900'C, and reduction curves, position of reaction zone and local fractional-reduction profiles were measured. Basic equations for the grain model were re-examined and solved as they were (unsteady numericai solution), and under quasi-steady (quasi-steady numerical one) and moreover linearization approximations (quasi-steady analytical one). When rate parameter values are selected suitabiy in each case, measuredreduction curves and reaction zone behavior are comparatively well reproduced by the calculated results.