Application example: total combustion of a coal particle
Interactive porous particles

Spherical, porous coal particles of diameter d _p = 10^–3 m are combusted in a fluidized bed of sand, the temperature of which is kept constant at 1,073 K. The characteristics of the particles are :

• bulk density: ρ_a = 300 kg · m^–3;

• specific surface: σ = 10 m² · g^–1;

• internal porosity: ε = 0.86 ;

• tortuosity factor: τ = 8.6 ;

• thermal conductivity: λ_e = 0.3 W · m^–1· K^–1.

The bed is fluidized with air at an empty-barrel velocity u = 10^–2 m · s^–1.

Combustion of coal particles takes place in two stages: oxidation of carbon to carbon monoxide, followed...