Abstract
The influence of additions of 1% by volume of methyl chloride, methyl iodide, methanol, acetone, and tetra-methyl and tetra-ethyl lead, on the burning of cloudds of coal particles in shocked oxygen and air has been studied. These additives were chosen on the basis of their marked effect on the burning of homogeneous systems. Their lack of effect in the early stages of burning in the present experiments suggests that the initial phase may be a heterogeneous reaction. Detonations were observed to occur with volumetric concentrations of less than 1% of tetra-ethyl and tetra-methyl lead in the presence and absence of particles of coal. Such concentrations are below the normal lower limit of flammability. This anomaly is explained in terms of a pyrolytic reaction liberating methyl or ethyl radicals prior to ignition and the production of an accelerating flame front.
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