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  

作　　者：Yingfeng Sun Shuaipeng Zhu Fei Xie Chujian Han Yixin Zhao Zetian Zhang 

机构地区：[1]Research Institute of Macro-Safety Science,University of Science and Technology Beijing,Beijing,100083,China [2]Schoolof Civiland Resource Engineering,University of Science and Technology Beijing,Beijing,100083,China [3]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,230029,China [4]Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),Bejing,10003 China [5]School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China [6]Key Laboratory of Deep Earth Science and Engineering(Sichuan University),Ministry of Education,Chengdu,610065,China

出　　处：《Particuology》2024年第4期114-123,共10页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (grant Nos.U1910206,52004293,52225402);Beijing Natural Science Foundation (grant No.8232057);the Open Project Program of State Key Laboratory of Coal and CBM Co-mining (grant No.2022KF21);Fundamental Research Funds for the Central Universities (grant No.FRF-TP-20-034A1);the Open Project Program of Key Laboratory of Deep Earth Science and Engineering (Sichuan University);Ministry of Education (grant No.DESE 202004);China Postdoctoral Science Foundation (grant No.2018M641526).

摘　　要：Coal seam CO_(2) 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 CO_(2) 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.

关 键 词：COAL Gas adsorption Synchrotron radiation small-angle X-ray SCATTERING Pore diameter Surface fractal dimension 

分 类 号：P61[天文地球—矿床学]