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The construction of coal body microstructure is the foundation of realizing the organic combination of coal micro seepage experiment and simulation. In light of the problem that traditional experimental methods cannot directly reveal the coal microstructure, a three-dimensional (3D) digital model for coal microstructure based on non-contact computed tomography (CT) images was developed here. Firstly, the high-precision micro-CT system μCT225KvFCB was used to obtain two-dimensional (2D) CT images of the coal core. Secondly, a CT image pre-processing methodical approach was developed. Furthermore, this paper proposed the gray level threshold segmentation (DTM) method as a way to obtain binary images for CT images. Thirdly, the CT images obtained above were then stacked to produce a 3D digital reconstruction model of the coal core. Taking the Shanxi Changzhi anthracite and Anhui Wugou long-flame coal, which have different degrees of metamorphism, as examples, an application of the quantitative parameters of the internal pore structure of the digital reconstruction model was calculated. The porosity experimental results obtained using the mercury intrusion method were analyzed to confirm the accuracy of the reconstruction process. Results show the 3D reconstruction models is fit to reveal the real pore structure of the coal microstructure and the porosity error obtained between the reconstruction model and laboratory analysis was less than 5%. The proposed 3D reconstruction method in the present study is capable of visually and quantitatively describing the characteristics of microstructure and porosity of raw coal.

Establishment and Application Study of Digital Model for Coal Microstructure Based on CT Images