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A mathematica l/ormulatioll is develojled describing a moving bed reactor ill which iron oxide Ilellets are reduced with hydrogen, in a COllllter-current flow arrangement. The model consi<ts 0/ the heat and mass balance equations wrillen/or both the gas and the solid streams, and the three interface, shrinkillg core lIlodel is emll/oyed/or rejJresellting the reaction kinetics . The model is thought to be general , ill that it allows/or Ilon-isothermal behavior alld nOll-uniformity (i. e., maldistributiOIl) 0/ both the solids alld the gas -<tream<A select-ioll 0/ the com/JUted results indicates very strollg coupling between the solids flow , gas flo w <lIld the rate 0/ reaction. If this coujlling is Il egleeted, as was dOlle ill previous investigations, vny marked distortion qf the results may occur.

A Mathematical Formulation for the Reduction of Iron Oxide Pellets in Moving Beds with Non-uniform Gas and Solids Flow