5. Application example: total combustion of a coal particle

5.1 Statement

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 m ² · g ^–1 ;

• internal porosity: ε = 0.86 ;

• tortuosity factor: τ = 8.6 ;

• ...