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Non-destructive characterization of coal samples from China using microfocus X-ray computed tomography by Yanbin Yao; Dameng Liu; Yao Che; Dazhen Tang; Shuheng Tang; Wenhui Huang is a Engineering article available to read on EtoBox.

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This paper demonstrates capabilities of microfocus X-ray computed tomography (μCT) in characterizing the development of coal porosity and fractures. For the investigated coals, the CT number of minerals, pores and coal matrix are approximately 3000, b 600 and 1000-1600 Hounsfield unit (HU), respectively. The total CT number of analyzed coals mainly relate to the density, coal maceral composition, and proportion of minerals and pores. Although the estimated porosities by segmentation method show some uncertainty, the results correlate well with the analyzed porosities by helium gas method and water-saturated method. The aperture, spacing and spatial distribution of fractures, and mineral morphology are semi-quantitatively evaluated by μCT using a computer-aided design. The slicing analyses of coals demonstrated that distributions of porosity in coals are highly anisotropic. The spatial disposition of pores, fractures and minerals is the most important factor that influences coal porosity and permeability. In spite of the limitation of low spatial resolution (70 μm) and some ring artifacts of X-ray, μCT has major advantages in nondestructive detection and 3D visualized characterizati

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Author

Yanbin Yao; Dameng Liu; Yao Che; Dazhen Tang; Shuheng Tang; Wenhui Huang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0166-5162)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)