Abstract
The naturally or industrially occurring flammable mixtures containing combustible gases or/and dusts represent a potential risk of
explosion with major consequences on the environment and human personnel. Methane and coal dust are among the best known
components able of leading to the formation of such mixtures either in coal mining activities or in different industries using coal
dust as fuel. In order to assess the risk of explosion and the explosion evolution in such composite mixtures, the knowledge of the
characteristic explosion parameters under standardized conditions is necessary. In this paper the maximum explosion pressure
pmax, maximum rate of pressure rise (dp/dt)max and explosion severity factor for methane-air mixtures, air - coal dust mixture and
hybrid air-methane-coal dust mixture were determined in a standard 20 dm3 spherical explosion vessel.