Abstract
The paper includes the study of regularities and characteristics of coal dust layer gas-phase ignition by a hot metal particle located on its surface. Such interaction conditions in practice can cause fires and major man-made disasters. In this work we analyzed three groups of coals used as fuel in thermal power engineering, which differ in particle dispersion: less than 140 µm, 140-200 µm, 200-500 µm, 500-1000 µm. Steel particles of different shapes (sphere, disk, parallelepiped) with identical heat content were used as local heating sources. The limits of gas-phase coal ignition were established. And also the ignition delay times were experimentally ascertained in conditions of parameters variation within the coal / metal particle system in wide ranges, including the initial temperatures from 900 to 1100 °C.
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