Experimental study on the porous structure and compressibility of tectonized coals

Qu, Zhenghui, Wang, Geoff G. X., Jiang, Bo, Rudolph, Victor and Dou, Xinzhao (2010) Experimental study on the porous structure and compressibility of tectonized coals. Energy and Fuels, 24 5: 2964-2973. doi:10.1021/ef9015075

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Author Qu, Zhenghui
Wang, Geoff G. X.
Jiang, Bo
Rudolph, Victor
Dou, Xinzhao
Title Experimental study on the porous structure and compressibility of tectonized coals
Journal name Energy and Fuels   Check publisher's open access policy
ISSN 0887-0624
1520-5029
Publication date 2010-05
Sub-type Article (original research)
DOI 10.1021/ef9015075
Volume 24
Issue 5
Start page 2964
End page 2973
Total pages 10
Editor Michael T. Klein
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2011
Language eng
Formatted abstract
This paper presents experimental investigations on the porous structure and compressibility of six representative tectonized coals, which were geologically formed because of post-formation tectonic deformation of the coal seam, resulting in various brittle and plastic structure development in the seam, such as fissure and fold. The investigations were carried out using microscopy and mercury intrusion porosimetry, providing experimental information about better characterization of the coal structure for coalbed methane recovery from tectonized coal seams. In combination with measurements of vitrinite reflectance and pore size distribution, the mercury intrusion porosimetry data were further analyzed with the fractal theory and used to determine the pore compressibility of the coal samples. The results show that tectonic deformation mainly reformed the bigger pores (pore size above 100 nm). In general, the increased tectonic deformation led to more open pores and, hence, the enhanced connectivity of the pore network. In fractal analysis, a linear relation was used to fit the mercury intrusion data at high pressure instead of the power law that was typically used in previous studies on ordinary coals. The volume-pressure curves obtained by mercury intrusion measurements for all coal samples exhibit a strong dependence relation with the deformation extent. The pore compressibility of these coals obviously decreases as the deformation extent increased, with only one exception for all coal samples studied. This implies that the weak deformation may be corresponding to a high compressibility. Moreover, the results also show that the rank may be responsible for a significant part of the differences in porosity and pore compressibility as well.
© 2010 American Chemical Society.
Keyword Mercury porosimetry
Pore structure
Carbon-dioxide
Dimensions
Particles
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 04 Jul 2010, 00:05:19 EST