首页|Real-time pore structure evolution difference between deep and shallow coal during gas adsorption:A study based on synchrotron radiation small-angle X-ray scattering

Real-time pore structure evolution difference between deep and shallow coal during gas adsorption:A study based on synchrotron radiation small-angle X-ray scattering

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Coal seam CO2 sequestration is an important option to address global warming.A better knowledge on coal pore structure evolution during gas adsorption can provide guidance for coal seams CO2 seques-tration.However,few investigations on the pore structure evolution differences between the deep and shallow coal were conducted during gas adsorption.In this study,based on the real-time synchrotron radiation small-angle X-ray scattering(SAXS)observation,the average pore diameter and pore surface fractal dimension evolution differences between deep and shallow coal were investigated from the as-pects of coal compositions and stress history.Two types of coal deformation(inner-swelling and outer-swelling)coexist during gas adsorption.Coal compositions have significant impact on the dominance of deformation type.The dominance of inner-swelling in deep coal is induced by the higher ash contents,and there is the decrease of average pore diameter during gas adsorption.The impact of stress-history(burial depth)on adsorption-induced deformation is more prominent than that of gas adsorption ca-pacity.In deep coal,the surface fractal dimension evolution presents a negative correlation with the evolution of pore diameters.In shallow coal,the surface fractal dimension evolution presents a Langmuir-type correlation with the adsorption time.

CoalGas adsorptionSynchrotron radiation small-angle X-ray scatteringPore diameterSurface fractal dimension

Yingfeng Sun、Shuaipeng Zhu、Fei Xie、Chujian Han、Yixin Zhao、Zetian Zhang

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Research Institute of Macro-Safety Science,University of Science and Technology Beijing,Beijing,100083,China

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

National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,230029,China

Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),Beijing,100083,China

School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China

Key Laboratory of Deep Earth Science and Engineering(Sichuan University),Ministry of Education,Chengdu,610065,China

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国家自然科学基金国家自然科学基金国家自然科学基金北京市自然科学基金Open Project Program of State Key Laboratory of Coal and CBM Comining中央高校基本科研业务费专项Open Project Program of Key Laboratory of Deep Earth Science and Engineering(Sichuan University)教育部项目中国博士后科学基金

U1910206520042935222540282320572022KF21FRF-TP-20-034A1DESE 2020042018M641526

2024

10.1016/j.partic.2023.08.002

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.87(4)
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