Abstract
Flame propagation of coal dust in a combustion tube was carried out through the numerical simulation of two-dimensional unsteady Navier-Stokes equations. In order to deal with the dust-flow interaction, particle in cell method was employed. The chemical reaction of volatile gas was assumed to be reversible 5-step reactions. The chemical species are CH_4, O_2, N_2, CO_2, H_2O, CO and H_2. The simulation reproduces the flame propagation behavior, and the results are agreed with experimental results. Numerical results showed that the flame propagated slowly during the initial stage after ignition. Subsequently, flame propagated more quickly, as the volatile matter burned immediately. It is also verified that coal devolatilization and the combustion of volatile gas significantly affected the flame propagation behavior.
