The effects of coal dust concentrations and particle sizes on the minimum auto-ignition temperature of a coal dust cloud

Flash fires and explosions in areas containing an enriched combustible dust atmosphere are a major safety concern in industrial processing. An experimental study was conducted to analyse the effects of atmospheric coal dust particle sizes and concentrations on the minimum autoignition temperature (MAIT) of a dust cloud. Two different coal samples from Australian coal mines were used. The coal dust particles were prepared and sized in 3 ranges, of below 74 mu m, 74 to 125 mu m and 125 to 212 mu m, by using a series of sieves and a sieve shaker. A humidifier was used to increase the moisture content of the particles to the required level. All the experiments were conducted in accordance with the ASTM E1491-06 method in a calibrated Goldbert-Greenwald furnace. The results from this study indicate that coal dust properties, such as the chemical nature (H/C), concentration, particle size (D-50), and moisture content, impact on the MAIT. For coal dust concentrations less than 1000 g.m(-3), the MAIT decreases with increasing coal dust concentrations. On the other hand, for low concentrations of 100 to 15 g.m(-3), the MAIT becomes more reliable for particle size D-50 rather than for volatile matters.