Abstract

The application of percolation theory to modelling of char gasification in the diffusional regime is presented. The Bethe network description of the pore space developed in Part I is used to evaluate effective diffusivities and permeabilities during char gasification. This approach fundamentally accounts for the influence of narrow necks, tortuous paths and dead ends. The gasification model also incorporates the effects of pore enlargement, pore coalescence and closed pores on the evolution of accessible porosity and surface area. In addition, the role of pore topology on perimeter fragmentation of the gasifying particle is included. These phenomena could have implications in the operation of gasifiers. Model predictions are in good agreement with experimental data.

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