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Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N2 and H2O adsorption methods
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-08 , DOI: 10.1002/ese3.727 Ming‐yi Chen 1, 2 , Ya‐pu Yang 1, 2 , Cai‐hong Gao 1, 2 , Yuan‐ping Cheng 3 , Jing‐chun Wang 1, 2 , Ning Wang 1, 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-08 , DOI: 10.1002/ese3.727 Ming‐yi Chen 1, 2 , Ya‐pu Yang 1, 2 , Cai‐hong Gao 1, 2 , Yuan‐ping Cheng 3 , Jing‐chun Wang 1, 2 , Ning Wang 1, 2
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Coal seam is a sedimentary body with complex pore system. The gas adsorption property of coal is greatly determined by the adsorption‐pores (<100 nm), and the fractal dimension can be used an index to estimate the impact of the adsorption‐pores on the methane adsorption capacity of various rank coals. In this paper, low‐temperature N2 adsorption and H2O adsorption methods were used to study the adsorption‐pores structure and its fractal features. The results show that the development of adsorption‐pores closely depends on the coalification, and the degree of pore development exhibits a U‐shaped trend with increasing coal rank. Additionally, the pore size distributions of coal samples from N2 adsorption analysis and H2O adsorption analysis are similar, especially for samples LH7 and WLH8. Fractal analysis indicates that D2(N2) (0.5 < P/P0 < 1) can more accurately characterize the fractal features of adsorption‐pores than D2(H2O), which may be a result of the significant coal‐H2O interaction. Moreover, D2(N2) has stronger correlations with the coal pore parameters. With the increase in D2(N2), the Langmuir volume first decreases and then increases, which is probably associated with the competition effect of the pore structure and surface irregularity of coal. When D2(N2) < 2.7‐2.8, the pore structure plays a key role, while for D2(N2) > 2.7‐2.8, the influence of the specific surface area is more prominent. The equilibrium moisture content of the coal samples also has a positive correlation with D2, except for low‐rank coal sample YZG2 due to the presence of a large amount of oxygen‐containing functional groups, which increases its water‐holding capacity.
中文翻译：
用N2和H2O吸附法研究吸附孔的分形特征及其对各种煤阶甲烷吸附能力的影响
煤层是具有复杂孔隙系统的沉积体。煤的气体吸附特性在很大程度上取决于吸附孔（<100 nm），而分形维数可作为一个指标来估算吸附孔对各种等级煤的甲烷吸附能力的影响。本文采用低温N 2吸附和H 2 O吸附方法研究了吸附孔的结构及其分形特征。结果表明，吸附孔的发育与煤化程度密切相关，且随着煤阶的增加，孔隙的发育程度呈U型趋势。另外，通过N 2吸附分析和H 2分析得出的煤样品的孔径分布O吸附分析相似，尤其是对于样品LH7和WLH8。分形分析表明，D 2（N 2）（0.5 < P / P 0 <1）可以比D 2（H 2 O）更加准确地描述吸附孔的分形特征，这可能是由于煤分H 2 O相互作用。此外，D 2（N 2）与煤孔参数具有更强的相关性。随着D 2（N 2），朗缪尔体积先减小然后增大，这可能与孔隙结构和煤表面不规则性的竞争效应有关。当D 2（N 2）<2.7-2.8时，孔结构起关键作用，而当D 2（N 2）> 2.7-2.8时，比表面积的影响更为明显。煤样品的平衡水分含量也与D 2正相关，但低阶煤样品YZG2除外，因为存在大量含氧官能团，从而提高了其持水能力。
更新日期：2020-06-08
中文翻译：
用N2和H2O吸附法研究吸附孔的分形特征及其对各种煤阶甲烷吸附能力的影响
煤层是具有复杂孔隙系统的沉积体。煤的气体吸附特性在很大程度上取决于吸附孔（<100 nm），而分形维数可作为一个指标来估算吸附孔对各种等级煤的甲烷吸附能力的影响。本文采用低温N 2吸附和H 2 O吸附方法研究了吸附孔的结构及其分形特征。结果表明，吸附孔的发育与煤化程度密切相关，且随着煤阶的增加，孔隙的发育程度呈U型趋势。另外，通过N 2吸附分析和H 2分析得出的煤样品的孔径分布O吸附分析相似，尤其是对于样品LH7和WLH8。分形分析表明，D 2（N 2）（0.5 < P / P 0 <1）可以比D 2（H 2 O）更加准确地描述吸附孔的分形特征，这可能是由于煤分H 2 O相互作用。此外，D 2（N 2）与煤孔参数具有更强的相关性。随着D 2（N 2），朗缪尔体积先减小然后增大，这可能与孔隙结构和煤表面不规则性的竞争效应有关。当D 2（N 2）<2.7-2.8时，孔结构起关键作用，而当D 2（N 2）> 2.7-2.8时，比表面积的影响更为明显。煤样品的平衡水分含量也与D 2正相关，但低阶煤样品YZG2除外，因为存在大量含氧官能团，从而提高了其持水能力。
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