The isosteric adsorption heat is an important parameter to measure the solid surface inhomogeneity during its adsorption. In this paper a high/low temperature adsorption experiment device is utilized to test the gas adsorption of anthracite coal of Jiulishan coal mine, lean coal of Xinyuan coal mine and gas-fat coal of Panbei coal mine at different temperatures ranging from 30 to -30℃. Then according to the relationship of isosteric adsorption heat and adsorption capacity, the influence of coal surface inhomogeneity is discussed at ordinary temperatures (30, 20℃) and low temperatures (-10, -20, -30℃). The analytical results show that the gas adsorption capacities of different coal ranks all increase with the decrease of environmental temperature. In an ordinary temperature environment (30, 20℃ ) the isosteric adsorption heat of coal decreases as the gas adsorption capacity increases, which indicates that the coal surface energy of adsorption is heterogeneous. But when cooling to -10, -20, or -30℃, the isosteric adsorption heat is almost irrelevant to the adsorption capacity of coal, which indicates that the coal surface energy of adsorption is uniform. So the Langmuir equation of the coal gas adsorption theory is more suitable to a low temperature environment (below 0℃).
YUE Gaowei
,
WANG Zhaofeng
,
XIE Ce
. Experimental Study of Coal Surface Adsorption Uniformity in Low Temperature Environment[J]. Science & Technology Review, 2014
, 32(31)
: 71
-74
.
DOI: 10.3981/j.issn.1000-7857.2014.31.010
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