Experimental Study on Reasonable Adsorption Time in Determination Coalbed Methane Content

Table 6

CBM content and numerical percentage of the maximum value at different adsorption time.

Adsorption time/h	CBM content (mL·g^-1)						Numerical percentage CBM content (%)
	WYY	WYR	PY	PR	QFY	QFR	WYY	WYR	PY	PR	QFY	QFR
4	12.98	14.58	6.78	7.62	5.73	7.19	70.62	67.07	76.01	74.56	96.14	94.36
8	14.64	15.74	7.62	8.15	5.82	7.22	79.65	72.40	85.43	79.75	97.65	94.75
12	15.74	17.41	8.13	8.96	5.86	7.25	85.64	80.08	91.14	87.67	98.32	95.14
16	16.50	18.44	8.24	9.16	5.88	7.37	89.77	84.82	92.38	89.63	98.66	96.72
20	16.89	19.26	8.65	9.82	5.90	7.47	91.89	88.59	96.97	96.09	98.99	98.03
24	17.07	19.88	8.84	10.14	5.92	7.53	92.87	91.44	99.10	99.22	99.33	98.82

Note: numerical percentage CBM content is the CBM content at different adsorption times divided by CBM content at adsorption equilibrium state.