Experimental Study on the Ignition Sensitivity and Explosion Severity of Different Ranks of Coal Dust

Table 3

Explosibility parameters of coal dust.

Coal sample	Cdust (g/m^3)	Pmax (MPa)	(dP/dt)max (MPa/s)	tb (ms)	KSt (MPa·m/s)
HM	125	0.431	12.3	65	3.34
	250	0.514	28.5	29	7.74
	375	0.479	54	17	14.66
	500	0.452	52.8	18	14.33
QM	125	0.412	7.67	119	2.08
	250	0.5	19.5	57	5.29
	375	0.465	36	37	9.77
	500	0.424	33.6	36	9.12
WY	125	—	—	—	—
	250	0.42	9.3	89	2.52
	375	0.448	16.6	67	4.51
	500	0.423	17.8	55	4.83