Research Article
Application of a Modified Low-Field NMR Method on Methane Adsorption of Medium-Rank Coals
Table 5
Results of the adsorbed methane on the coal samples determined by the low-field NMR method.
| Sample | Parameters | Sequence | 1 | 2 | 3 | 4 | 5 | 6 |
| ML | (MPa) | 1.19 | 2.61 | 3.63 | 4.70 | 6.05 | 7.73 | S1 | 7897.07 | 8424.60 | 8796.56 | 8746.33 | 9179.86 | 9341.07 | (m3/t) | 6.479 | 10.090 | 11.394 | 12.288 | 13.252 | 14.779 | ZCD | (MPa) | 1.40 | 2.86 | 4.30 | 5.54 | 6.58 | 7.61 | S1 | 8935.66 | 9224.92 | 9391.05 | 9450.81 | 9444.28 | 9431.63 | (m3/t) | 6.599 | 9.833 | 11.620 | 12.976 | 14.059 | 14.948 | TL | (MPa) | 1.39 | 2.80 | 4.06 | 5.20 | 6.30 | 7.54 | S1 | 1704.017 | 3933.606 | 5624.065 | 7407.862 | 9207.367 | 11112.86 | (m3/t) | 7.620 | 11.659 | 13.077 | 14.210 | 15.360 | 16.076 | XQ | (MPa) | 0.95 | 1.87 | 2.70 | 4.59 | 6.72 | 7.98 | S1 | 3594.01 | 9297.04 | 9314.20 | 10060.46 | 10062.72 | 10032.34 | (m3/t) | 5.355 | 8.493 | 10.397 | 12.773 | 14.742 | 16.089 | XM | (MPa) | 0.97 | 1.97 | 2.74 | 4.19 | 5.84 | 7.78 | S1 | 13403.84 | 14419.56 | 14586.88 | 14808.96 | 15510.67 | 15556.58 | (m3/t) | 6.073 | 9.685 | 11.575 | 13.830 | 15.757 | 17.372 | DEP | (MPa) | 1.06 | 2.59 | 4.02 | 5.24 | 6.54 | 7.86 | S1 | 9913.70 | 10210.35 | 10476.55 | 10911.88 | 11332.63 | 11377.45 | (m3/t) | 7.940 | 11.095 | 14.480 | 16.720 | 17.660 | 18.802 | DQ | (MPa) | 1.30 | 2.71 | 4.38 | 5.65 | 6.93 | 7.72 | S1 | 9533.81 | 9830.48 | 10296.58 | 10531.93 | 10872.74 | 10997.56 | (m3/t) | 10988 | 15.506 | 19.860 | 21.093 | 23.314 | 23.810 |
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is the volume of adsorbed methane determined by the low-field NMR method. |