Abstract
The turbulent dispersion of coal particle is a particularly important factor influencing the combustion efficiency of pulverised coal in the blast furnace raceway. A stochastic approach in modelling the particle dispersion was implemented for simulating particle trajectories in both free space and a packed bed. A new model for the interaction between particles and a packed bed has been developed and incorporated in a two-dimensional mathematical model of pulverised coal combustion.
Validation work of the model were completed for a round free jet and a packed bed. Intense particle dispersion and mixing were observed in the packed bed. Along with the large slip velocity between gas and particles, the intense mixing suggests a higher burning rate in a packed bed than in a free space.
