A numerical model is presented, designed to simulate the kinetic and thermalbehaviour of a porous pellet in which any gas-solid reaction is taking place.Its novelty consists in the fact that it can deal with reactions whether theyare exothermic or endothermic, whether they are equimolar or not, whether theyare reversible or irreversible, and further reactions in the transient regimeand even the possible presence of inert gases and solids can be treated. Thenumerical scheme is based on the finite volume method in an implicitformulation, with a specific treatment of the thermal source term for stronglyexothermic reactions. The model was validated by comparison with analytical andnumerical solutions from the literature and was used to simulate the exothermicreaction involved in the oxidation of zinc sulphide.
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