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Numerical researches have been carried out to study the influence of air flow   temperature and a fossil fuel particle rate on sufficient conditions of   ignition in a “coal particle - air” system. Developed mathematical model   takes into account interconnected processes of heat transfer in a coal   particle and gas area, thermal decomposition of organic material, diffusion   and gas-phase oxidation of volatiles, heating of a coke (carbon) and its   heterogeneous ignition. The effect of low-temperature (about 600 K) ignition   for a single coal particle is impossible even at variation of its rate   (radius) from 0.05 mm to 0.5 mm. Nevertheless this process is possible for   group of particles (two, three, et al.) situated at close-range from each   other. The physical aspects of the problem are discussed

Numerical research of heat and mass transfer during low-temperature ignition of a coal particle