Table 1. Basic Parameters of the Coal Samples in Tests.

			industrial analysis/%
coal number	degrees of metamorphism	coal structure	Mad	Aad	Vad
WYM	anthracite	native structure	3.06	15.18	9.44
PSM	meager-lean coal	native structure	0.45	8.58	17.97
JM	coking	native structure	0.67	10.81	21.37
CYM	long-flame coal	native structure	6.41	1.90	38.16