Abstract
The influence of coal rank, maceral composition, particle size, pressure, temperature and heating rate on the ignition of single coal particles was studied with a heated-grid apparatus (1400K, 10 MPa) working in connection with a high-speed camera. Experimental conditions were chosen to simulate the conditions of p.f. combustion and to provide data for a kinetic description. The temperatures of the homogeneous and heterogeneous ignition are strongly influenced by oxygen partial pressure and heating rate as well as rank and maceral composition. The oxygen partial pressure is an important parameter during combustion, and also influences the interplay of pyrolysis and combustion.
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