基于同步辐射X射线CT的无烟煤样孔隙分布表征  

Characterization of Pore Distribution of the Anthracite Coal Sample Based on Synchrotron Radiation X-ray CT

作　　者：王润花 王海鹏[2,3] 李建莉 王晋庥 李琨杰 Y.S.Yang WANG Runhua;WANG Haipeng;LI Jianli;WANG Jinxiu;LI Kunjie;YSYang(Shanxi University Institute of Theoretical Physics and Department of Physics,Taiyuan 030006,China;Shanxi University College of Physics and Electronics Engineering,Taiyuan 030006,China;Shanxi University Institute of Coal-derived Gas Reservoir Physical Properties and Resource Development,Taiyuan 030006,China;Shanxi Guoxin Gas Energy Research Institute Co.LTD,Taiyuan 030006,China;Commonwealth Scientific and Industrial Research Organisation(CSIRO),Clayton South,VIC 3169,Australia)

机构地区：[1]山西大学理论物理研究所,太原030006 [2]山西大学物理电子工程学院,太原030006 [3]山西大学煤成气储层物性与资源开发研究院,太原030006 [4]山西国新气体能源研究院有限公司,太原030006 [5]澳大利亚联邦科学与工业研究组织,维多利亚州克莱顿3169

出　　处：《CT理论与应用研究（中英文）》2021年第6期691-700,共10页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金(于同步辐射CT的煤直接液化残渣物理结构可视化表征(21206087))。

摘　　要：本文利用同步辐射X射线对一沁水盆地无烟煤样在24 keV的能量下进行了成像,并重构得到其CT切片。分别采用数字地形模型(DTM)和数据约束模型(DCM)对样品的CT切片进行分析。研究结果表明,对本文所用煤样,DTM计算得到的煤样孔隙率与真密度和视相对密度实验法测得孔隙率较为接近,但利用DTM确定的阈值进行阈值分割提取到的样品孔隙率与DTM计算所得孔隙率之间偏差较大。DCM计算得到的孔隙率与DTM计算得到的孔隙率及实验测试结果均较为接近。DCM模型考虑了样品CT成像过程中的部分体积效应,得到小于CT体元的孔隙分布信息,在一定程度上拓展了CT成像技术的表征尺度。DCM计算结果显示,煤样中孔隙更多与煤基质和矿物组分以部分占据CT体元的形式存在。Synchrotron Radiation X-ray was performed on the anthracite coal sample from Sihe Mine in Qinshui Basin at beam energy of 24 ke V, then CT slices of the sample were obtained by reconstructing the projections images. The CT slices of the sample were analyzed by adopting the methods of the digital terrain model(DTM)and the data-constrained modelling(DCM) respectively. The results showed that, as for the coal sample used in this paper, the porosity calculated by DTM was close to that measured by combination of the true density and the apparent relative density method. Yet, the porosity obtained by the threshold segmentation method based on the threshold determined by DTM was quite different from the porosity calculated by DTM. The porosity calculated by DCM was consistent with the porosity calculated by DTM and the experimental results. By taking the partial volume effect of the CT imaging process into considration, the DCM obtained the distribution information of pores whose size were smaller than that of the CT voxel size, which expanded the characterization length scale of CT imaging technique to some extent. The DCM calculated results indicated that most pores in the coal sample mostly coexisted as partially occupied CT voxels with coal matrix or mineral compositionsl.

关 键 词：同步辐射CT 数据约束模型 数字地形模型 煤样孔隙率 

分 类 号：O242[理学—计算数学] TP391.41[理学—数学]