Abstract
In the paper, the results of research on ignition and flame propagation between particles of various kinds of coal in conditions at zero gravity are presented. Direct and Schlieren photographs of the process were made. They illustrate the influence of the oxygen concentration in the air, the volatile contents in the coal and the distance between particles in the investigated process. The absence of free convection makes it possible to evaluate directly the influence of two heat transport mechanisms, i.e. the thermal conduction and radiation. There were also presented certain remarks resulting from the investigations of the ignition and burning of single coal particles which may be of use in modelling the coal-dust-air mixture combustion process.
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