Modeling of ignition and combustion of turbulized dust-air mixtures

A model of turbulent combustion and ignition of polydisperse dust-air mixtu res is developed. The mathematical model allows for interactions between th e gas and dust phases and combines the deterministic and stochastic approac hes to their description. The equations governing particle motion include r andom turbulent fluctuations of the gas flow. The models of phase transitio ns and chemical reactions take into account thermal destruction of dust par ticles, sublimation of volatiles, chemical reactions in the gas phase, and heterogeneous carbon oxidation by O-2 and CO2 which depends both on diffusi on and kinetic parameters. The model was compared with experimental data on combustion of organic dust in closed vessels at various initial turbulence intensities. The suggested mathematical model permits the peculiarities of ignition and burning of polydisperse organic dusts and the effect of flow inhomogeneity on the ignition limits to be studied.