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

作　　者：Zhongbei Li Ting Ren Yuanping Cheng Xueqiu He Ming Qiao Dennis Black Kun Li Jan Nemcik 

机构地区：[1]School of Civil,Mining,Environmental and Architectural Engineering,University of Wollongong,Wollongong,NSW 2522,Australia [2]School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China [3]School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]GM3-Dendrobium Mine,Mount Kembla,NSW 2529,Australia

出　　处：《International Journal of Mining Science and Technology》2024年第10期1453-1463,共11页矿业科学技术学报（英文版）

基　　金：provided by the China Scholarship Council(No.202006430006)and the University of Wollongong;supported by the ACARP Projects(Nos.C28006 and C35015);support from the Coal Services Health and Safety Trust(No.20661)。

摘　　要：Methane(CH_(4))and carbon dioxide(CO_(2))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 CO_(2)and CH_(4)i n coal particles of various sizes and inΦ50mm 100 mm intact coal samples were achieved using the improved hysteresis index(IHI).The experimental findings validated that the proposed desorption model accurately describes the desorption behavior of CO_(2)and CH_(4)in coal(R^(2)>0.99).Based on the adsorption-desorption properties of inkbottle-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 presence of residual gas were elucidated.Furthermore,the study explored the impact of CO_(2)and CH_(4)adsorption-desorption hysteresis effects on coal and gas outbursts,suggesting that coal seams rich in CO_(2)do not have a higher propensity for outbursts than those rich in CH_(4).

关 键 词：METHANE Carbon dioxide Adsorption-desorption hysteresis Size effect Coal and gas outburst 

分 类 号：TD713[矿业工程—矿井通风与安全] O647.3[理学—物理化学]