Study of methane and carbon dioxide adsorption-desorption hysteresis in coals from Sydney Basin:A theoretical and experimental approach

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外文摘要：Methane(CH4)and carbon dioxide(CO2)are primary components of coal seam gas(CSG).Understanding their adsorption-desorption hysteresis characteristics,along with the fundamental mechanism,is crucial for CSG exploitation and related hazards mitigation.This research focused on the representative Bulli coal seam in the Sydney Basin,Australia.Through the purpose-built indirect gravimetric high-pressure isothermal adsorption-desorption hysteresis experiment,a novel Langmuir-based desorption model,incorporating hysteresis effect and residual gas,was proposed.Quantitative characterization of the adsorption-desorption hysteresis degrees of CO2 and CH4 in coal particles of various sizes and in Φ50 mm × 100 mm intact coal samples were achieved using the improved hysteresis index(IHI).The exper-imental findings validated that the proposed desorption model accurately describes the desorption behavior of CO2 and CH4 in coal(R2＞0.99).Based on the adsorption-desorption properties of ink-bottle-shaped micropores and pore deformation caused by gas adsorption-induced coal expansion,the occurrence mechanism of adsorption-desorption hysteresis and the fundamental reasons for the pres-ence of residual gas were elucidated.Furthermore,the study explored the impact of CO2 and CH4 adsorption-desorption hysteresis effects on coal and gas outbursts,suggesting that coal seams rich in CO2 do not have a higher propensity for outbursts than those rich in CH4.

外文关键词：

MethaneCarbon dioxideAdsorption-desorption hysteresisSize effectCoal and gas outburst

作者：

Zhongbei Li、Ting Ren、Yuanping Cheng、Xueqiu He、Ming Qiao、Dennis Black、Kun Li、Jan Nemcik

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作者单位：

School of Civil,Mining,Environmental and Architectural Engineering,University of Wollongong,Wollongong,NSW 2522,Australia

School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China

GM3-Dendrobium Mine,Mount Kembla,NSW 2529,Australia

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出版年：

2024

DOI：

10.1016/j.ijmst.2024.09.008

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2024.34(10)