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The present work is aimed at unsteady-state mathematical modeling and simulation of the steam gasification of a single char particle. The unsteady state diffusion-reaction competitive gasification of a porous non-catalytic solid (char) was solved numerically using the staggered grid finite volume method (SGFVM). It was assumed that the char particle is spherical in shape and there is no change in its size during the gasification, and temperature variation within the particle is negligible. The model is capable of predicting detailed point-to-point reaction, diffusion, and concentration profile in a spatiotemporal domain inside the particle. The study revealed that the gasification of the char particle at higher temperature (&gt;1,100 K) bear a resemblance to the shrinking core model and at a lower temperature (&lt;1,100 K) it follows the progressive conversion model. The study also includes the effects of the temperature, time, and carbon concentration on the rate and conversion inside the char particle.

Staggered Grid Finite Volume Approach for Modeling Single Particle Char Gasification