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Study on seepage and deformation characteristics of coal microstructure by 3D reconstruction of CT images at high temperatures

查看全文 作　　者：Gang [1,2]Wang;Xiangjie [2]Qin;Dongyang [2]Han;Zhiyuan [2]Liu 高影响力作者 机构地区：[1]State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry Of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China;[2]College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2021年第31卷第2期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Project Nos.51934004,51674158,51574158,and 51474106);the Major Program of Shandong Province Natural Science Foundation(ZR2018ZA0602);the Taishan Scholar Talent Team Support Plan for Advantaged&Unique Discipline Areas;the Science and technology support plan for Youth Innovation of colleges and universities in Shandong Province(2019KJH006);the special funds for Taishan scholar project(TS20190935)。 摘　　要：To study the seepage and deformation characteristics of coal at high temperatures,coal samples from six different regions were selected and subjected to computed tomography(CT)scanning studies.In conjunction with ANSYS software,3 D reconstruction of CT images was used for the establishment of fluidsolid conjugate heat transfer model and coal thermal deformation model based on the microstructures of coal.In addition,the structure of coal was studied in 2 D and 3 D perspectives,followed by the analysis of seepage and deformation characteristics of coal at high temperatures.The results of this study indicated that porosity positively correlated with the fractal dimension,and the connectivity and seepage performances were roughly identical from 2 D and 3 D perspectives.As the porosity increased,the fractal dimension of coal samples became larger and the pore-fracture structures became more complex.As a result,the permeability of coal samples decreased.In the meantime,fluid was fully heated,generating high-temperature water at outlet.However,when the porosity was low,the outlet temperature was very high.The average deformation of coal skeleton with different pore-fracture structures at high temperatures showed a trend of initial increase and subsequent decrease with the increase of porosity and fractal dimension.The maximum deformation of coal skeleton positively correlated with connectivity but negatively correlated with the fractal dimension. 关 键 词：COAL Pore-fracture structures Fluid-solid conjugate heat transfer Thermal deformation
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