Table 4. Specific Surface Energy Variation.
| 30 °C |
40 °C |
50 °C |
||||
|---|---|---|---|---|---|---|
| coal sample | equilibrium pressure (MPa) | change value (kJ/m2) | equilibrium pressure (MPa) | change value (kJ/m2) | equilibrium pressure (MPa) | change value (kJ/m2) |
| Kiamusze | 0.13 | 585.10 | 0.13 | 584.20 | 0.13 | 410.80 |
| 0.23 | 1628.52 | 0.23 | 1466.00 | 0.24 | 1359.91 | |
| 0.59 | 2443.47 | 0.61 | 2142.62 | 0.64 | 2079.92 | |
| 1.02 | 3580.92 | 1.05 | 3153.20 | 1.01 | 3179.00 | |
| 1.40 | 4110.77 | 1.38 | 3679.71 | 1.38 | 3721.72 | |
| 1.78 | 4544.56 | 1.82 | 4076.22 | 1.83 | 4131.00 | |
| Panxi | 0.11 | 1364.44 | 0.11 | 1484.92 | 0.11 | 1196.42 |
| 0.21 | 2516.11 | 0.22 | 2608.68 | 0.21 | 2240.77 | |
| 0.58 | 3717.00 | 0.58 | 3666.25 | 0.59 | 3369.12 | |
| 0.97 | 4632.79 | 0.98 | 4487.00 | 0.98 | 4304.00 | |
| 1.40 | 5665.22 | 1.38 | 5550.11 | 1.37 | 5403.73 | |
| 1.76 | 6164.09 | 1.79 | 6023.11 | 1.81 | 5886.77 | |
| Haitian | 0.12 | 1214.52 | 0.12 | 1121.14 | 0.13 | 1086.12 |
| 0.22 | 2341.47 | 0.23 | 2281.49 | 0.21 | 2246.51 | |
| 0.61 | 3145.69 | 0.61 | 2881.18 | 0.63 | 2846.21 | |
| 1.01 | 4487.48 | 1.03 | 4184.48 | 1.01 | 4149.49 | |
| 1.38 | 4875.49 | 1.392 | 4423.21 | 1.40 | 4388.22 | |
| 1.78 | 5100.41 | 1.77 | 4927.51 | 1.76 | 4892.47 | |
| Pingba | 0.12 | 323.73 | 0.12 | 230.33 | 0.14 | 195.32 |
| 0.21 | 1450.72 | 0.22 | 1390.72 | 0.22 | 1355.71 | |
| 0.61 | 2666.62 | 0.62 | 2402.10 | 0.61 | 2367.11 | |
| 1.01 | 4420.14 | 0.98 | 4117.12 | 0.99 | 4082.13 | |
| 1.42 | 4808.12 | 1.39 | 4355.79 | 1.40 | 4320.78 | |
| 1.80 | 5033.00 | 1.79 | 4860.10 | 1.80 | 4825.12 | |
| Pingbao | 0.13 | 761.36 | 0.12 | 667.87 | 0.12 | 632.88 |
| 0.22 | 1476.58 | 0.21 | 1416.63 | 0.20 | 1381.63 | |
| 0.63 | 3104.21 | 0.61 | 2839.72 | 0.60 | 2804.65 | |
| 1.10 | 4446.00 | 1.08 | 4143.00 | 1.06 | 4108.00 | |
| 1.40 | 4834.00 | 1.39 | 4381.67 | 1.40 | 4346.73 | |
| 1.82 | 5058.92 | 1.80 | 4886.00 | 1.79 | 4851.00 | |
| Matigou | 0.12 | 722.21 | 0.12 | 842.69 | 0.12 | 554.23 |
| 0.19 | 2285.58 | 0.18 | 2378.22 | 0.17 | 2010.29 | |
| 0.49 | 3486.49 | 0.48 | 3435.71 | 0.47 | 3138.58 | |
| 0.82 | 4814.00 | 0.81 | 4668.21 | 0.83 | 4485.22 | |
| 1.20 | 5434.73 | 1.21 | 5319.59 | 1.19 | 5173.21 | |
| 1.60 | 5933.58 | 1.59 | 5792.55 | 1.57 | 5656.31 | |
| Ordos | 0.13 | 814.72 | 0.12 | 935.23 | 0.12 | 646.74 |
| 0.18 | 2378.09 | 0.17 | 2470.70 | 0.17 | 2102.77 | |
| 0.51 | 3579.00 | 0.50 | 3528.20 | 0.49 | 3231.14 | |
| 0.98 | 4906.52 | 0.97 | 4760.70 | 0.88 | 4577.68 | |
| 1.29 | 5527.18 | 1.28 | 5412.11 | 1.29 | 5265.66 | |
| 1.77 | 6026.12 | 1.79 | 5885.13 | 1.78 | 5748.82 | |
| Zhaozhuang | 0.14 | 1227.59 | 0.13 | 1348.15 | 0.12 | 1059.60 |
| 0.18 | 2791.00 | 0.18 | 2883.62 | 0.17 | 2515.70 | |
| 0.49 | 3991.92 | 0.48 | 3941.11 | 0.46 | 3644.00 | |
| 0.98 | 5319.43 | 0.97 | 5173.64 | 0.88 | 4990.55 | |
| 1.19 | 5940.11 | 1.18 | 5825.00 | 1.20 | 5678.58 | |
| 1.49 | 6439.00 | 1.50 | 6298.00 | 1.51 | 6161.72 | |