Investigation of the Velocities of Coals of Diverse Rank under Water- or Gas-Saturated Conditions for Application in Coalbed Methane Recovery

Table 1

Detail properties of the coals with different ranks.

Type	Density (g/cm^3)	Porosity (%)	Proximate analysis (%)				(%)	Maceral analysis (%)
			Lignite	1.28-1.55	1.07-3.17	11.37		14.63	53.41	20.59	0.32	79.5	15.5	3.6	1.4
Bituminite	1.23-1.42	0.3-4.0	8.83	3.30	29.64	58.23	1.13	58.7	32.6	3.4	5.3
Anthracite	1.29-1.61	0.3- 2.9	2.10	7.73	6.48	83.69	3.05	86.4	10.5	1.5	1.6

M_ad: water content; A_ad: ash content; V_daf: volatile component; FC_ad: fixed carbon content; V: vitrinite; I: inertinite; E: exinite; M: mineral content; R_o,max: the maximum reflectance of vitrinite.