基于DCM模型与同步辐射CT的煤直接液化残渣物理结构表征  

Physical Structure Characterization of Direct Coal Liquefaction Residue by DCM Model and Synchrotron X-ray CT

作　　者：王海鹏[1] 杨玉双[1,2] 蒋兴家 杨建丽[3] 聂一行[1] 

机构地区：[1]山西大学理论物理研究所,山西太原030006 [2]澳大利亚联邦科学与工业研究组织 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《山西大学学报（自然科学版）》2014年第4期545-552,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：国家重大基础研究发展计划973(No.2014CB239004);国家自然科学基金项目(No.21206087);山西省百人计划项目资助

摘　　要：利用多能量同步辐射CT与数据约束模型(DCM)对煤直接液化残渣样品物理结构进行了可视化表征。对残渣样品组分X射线吸收特性进行了分析。分别在14keV、16keV、20keV的X射线能量下获得三组残渣样品的CT实验数据并进行了重构。研究发现,基于DCM方法可区分残渣样品CT图像中未转化的煤基质与重油及沥青类物质,而重油与沥青类物质不可相互区分。DCM计算结果表明残渣中未转化的煤基质与重油及沥青类物质交错分布,黄铁矿呈聚集状态分布,样品中部分区域可见弥散分布的含铁催化剂颗粒。A data-constrained modelling（DCM）approach with multi-spectrum synchrotron X-ray CT was used to characterizing the physical structure of a direct coal liquefaction residue sample.The X-ray absorption properties of residue compositions were analyzed.Three sets of X-ray CT data were acquired with monochromatic beam energies at 14,16,and 20 keV respectively.The results show that the DCM can identify the unconverted coal matrix,asphaltene and heavy oil.However,the asphaltene and heavy oil are difficult to be distinguished between each other by the DCM.The DCM results indicate that the unconverted coal matrix,asphaltene and heavy oil distribute crossly in the residue.The iron element existing in catalyst or pyrite/pyrrhotite also can be detected in the CT slice by DCM.

关 键 词：数据约束模型 同步辐射CT 煤直接液化残渣 显微结构 

分 类 号：O552[理学—热学与物质分子运动论]