【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。更多还原

【Abstract】 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.更多还原