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Energies 2017, 10(11), 1881; doi:10.3390/en10111881

Characteristics of Pore Structure and Fractal Dimension of Isometamorphic Anthracite

1,2,3,* , 2,* , 1
,
2
and
2
1
State Key Laboratory of Coal and Coalbed Methane Co-mining, Jincheng 048006, China
2
School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
3
Collaborative Innovation Center of Coalbed Methane (Shale Gas) for Central Plains Economic Region, Jiaozuo 454000, China
*
Authors to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 8 November 2017 / Accepted: 14 November 2017 / Published: 16 November 2017
(This article belongs to the Section Energy Sources)
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Abstract

The geologic conditions of No. 3 coal seams are similar to Sihe and Zhaozhuang Collieries, however, the gas production is significantly different. To better understand the effect of pores, by means of experimental measurements and quantitative analysis, the pore properties of high-rank isometamorphic anthracite were thoroughly studied. Our study showed that the pore structures were predominantly adsorptive, accounting for more than 88% of the specific surface area. The coal pores showed typical three-stage fractal characteristics at boundary points of 1 nm and 9 nm (7 nm of coal samples from Zhaozhuang Colliery), and the fractal dimension with 1–9 nm (or 1–7 nm), as being significantly larger than those measured outside the given ranges. Pores in samples from Sihe Colliery were mainly open spherical or ellipsoidal pores in shape; conversely, those from Zhaozhuang Colliery were mainly Y-shaped, V-shaped, or ‘ink-bottle’ type. View Full-Text
Keywords: isometamorphic anthracite; pore properties; fractal theory; coal-bed methane; Qinshui Basin isometamorphic anthracite; pore properties; fractal theory; coal-bed methane; Qinshui Basin
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Gao, D.; Li, M.; Wang, B.; Hu, B.; Liu, J. Characteristics of Pore Structure and Fractal Dimension of Isometamorphic Anthracite. Energies 2017, 10, 1881.

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