Abstract
A diffusion and reaction model describing the combustion of porous char particles is developed and used to study the effects of intraparticle diffusional limitations on their pseudo-steady state and dynamic behaviour. The model allows for intraparticle temperature gradients and shrinkage of the reacting particles. Extensive computations over a wide range of ambient temperature and particle size reveal a strong dependence of the ignition and extinction phenomena observed in the combustion of porous particles, and hence of the predicted burning times, on the initial mass transport resistances and on their evolution with the extent of reaction.
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