AIChE Journal · 1973 · 45 citations · 10 references
EngineeringChemical EngineeringMaterials EngineeringChemical KineticsReaction EngineeringTransport PhenomenaDiffusion-controlled ReactionsGas TransferKinetic ModelingMass TransferMass TransportSolidification ShrinkageBoundary ProblemBoundary Value Problem SolversChemical DiffusionGasificationMass Transfer MechanismsOxidant TransportReaction - Diffusion ModelingShrinkage
Abstract Gasification model developed in Part I is extended to allow for mass transfer of oxidant to the particle and for intraparticle diffusion. For this extension, a moving boundary problem results which is solved numerically in conjunction with a two‐point boundary value problem for the oxidant concentration profile in the particle. The extended model predicts, as expected, that mass transfer stifles gasification and intraparticle diffusion shifts gasification to the outer surface of the particle. For the conditions and parameters used in Part I, particle Thiele moduli above 10 result in particle shrinkage with negligible change in the solid properties, whereas if this modulus is less than 0.1, gasification is kinetically controlled.
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