Research Article
Effects of Igneous Intrusion on Microporosity and Gas Adsorption Capacity of Coals in the Haizi Mine, China
Table 2
Pore characteristics, adsorptive capacity, and initial gas-releasing rates of coal samples.
| Sample | Units | Number 1 | Number 2 | Number 3 | Number 4 | Number 5 | Number 6 | Number 7 | Number 8 | Number 9 | Number 10 | Number 11 | Number 12 |
| Distance from sill | (m) | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 160 | 180 | 200 | BET surface area | (m2/g) | 2.2 | 2.8 | 2.8 | 3.4 | 3.6 | 4.2 | 3.4 | 3.6 | 2.4 | 1.7 | 1.4 | 1.5 | D-R micr. surface area | (m2/g) | 21.9 | 23.5 | 25.2 | 36.4 | 34.7 | 35.6 | 32.5 | 31.7 | 33.8 | 18.1 | 19.3 | 17.8 | D-A micropore volume | (cm3/g) | 0.0079 | 0.0082 | 0.0095 | 0.0146 | 0.0121 | 0.0131 | 0.0138 | 0.0111 | 0.0153 | 0.0088 | 0.0067 | 0.0054 | Avg. micropore size | (nm) | 1.21 | 1.23 | 1.24 | 1.33 | 1.29 | 1.31 | 1.26 | 1.25 | 1.27 | 1.19 | 1.22 | 1.18 | | | 0.42 | 0.40 | 0.38 | 0.22 | 0.25 | 0.30 | 0.29 | 0.26 | 0.21 | 0.17 | 0.12 | 0.16 | | (mmHg) | 48 | 43 | 34 | 32 | 34 | 31 | 28 | 31 | 30 | 26 | 21 | 19 | | (m3/t) | 37.0 | 34.2 | 33.1 | 35.8 | 29.9 | 36.5 | 31.1 | 34.7 | 31.7 | 26.2 | 24.6 | 26.1 | | (kPa) | 957 | 808 | 796 | 732 | 1217 | 822 | 998 | 1412 | 1179 | 828 | 1519 | 812 |
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Note: micropores are pores <2 nm; : coal firmness coefficient; : initial gas-releasing rate; : Langmuir volume; : Langmuir pressure (daf basis).
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