Numerical analysis of ignition and combustion of pulverized coal particle cloud

A transient group combustion model was presented for the pulverized coal particles in spherical cloud. Homogeneous and heterogeneous reactions were modeled to take account of the interactions of particles. The variation of flame structure of cloud was obtained. The effects of parameters on cloud ignition and combustion were analyzed. The homogeneous ignition delay was decreased, and then increased with the increase of concentration of particles. The increase of pulverized coal size and decrease of ambient gas temperature delay homogeneous ignition. The delay time was reduced, and the combustion rate was increased with the increase of oxygen concentration. Simulation results were in agreement with published experimental findings.