基于同步辐射X射线相衬显微CT技术的煤孔隙结构表征

Representation of Coal Pore Structure by Phase Contrast Microscopy CT Based on Synchrotron Radiation X-ray

以上海同步辐射装置产生的同步X射线束为光源,对3种不同变质程度煤样的相位衬度CT成像和重构二维横截面投影,得到煤样和煤中矿物质的三维立体图像,经定量分析可知煤样的总孔隙体积、单个矿物质最大体积、矿物质总数以及矿物质平均体积等参数。结果表明:随着变质程度的加深,煤中总孔隙体积和矿物质平均体积均呈逐渐减少趋势,煤中孔隙从大孔逐渐过渡到大中孔和微孔,呈逐渐紧密化的物理结构特征。

Taking X-ray generated by synchrotron radiation equipment as the light source, the 3-D images of three coal samples with different metamorphic-grade were achieved though the imaging of phase contrast microscopy CT and the reconstruction of 2-dimensional cross-section projection. Quantitative analysis determined the total pore volume of the coal samples, maximum volume of single mineral, total number and average volume of the minerals. The results show that, with the deepening of metamorphism,the total pore volume and the average volume of the minerals decrease. In addition, the pores are characteristic of gradual compaction of physical structure, varying from large to medium/large, and to micro-pore.