Combustion of porous carbon particles in air

Combustion of a carbon particle in air is considered on the basis of a diffusion-kinetic model. Two regimes of combustion are shown to exist: high- and low-rate regimes. In the high-rate combustion regime, oxygen is totally consumed in a homogeneous reaction running above the particle surface and does not reach the particle, whereas carbon is consumed in a reaction with carbon dioxide. In the low-rate combustion regime, oxygen reaches the particle surface, and the reaction of carbon with oxygen producing carbon dioxide runs within the porous particle.