Coal-gas interaction： implications of changes in texture and porosity

Coal-gas interaction： implications of changes in texture and porosity

Transient sorption and desorption of helium and carbon dioxide in Upper Freeport coal powder and lumps were analyzed. Differences in texture and porosity between the powder and lumps may affect the transport and interaction of the penetrant and coal. In this work, we address macroscopic and mesoscop...

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Bibliographic Details
Published in:International journal of coal science & technology Vol. 3; no. 1; pp. 10 - 19
Main Authors: Romanov, Vyacheslav N., Graeser, Lauren C., Jikich, Sinisha A., Soong, Yee, Irdi, Gino A.
Format: Journal Article
Language:English
Published: Beijing China Coal Society 01-03-2016
Springer Nature B.V
Subjects:
Carbon dioxide
Coal
Decay
Energy
Fossil Fuels (incl. Carbon Capture)
Geotechnical Engineering & Applied Earth Sciences
Helium
Mineral Resources
Porosity
Research Article
压力衰减
孔隙度
孔隙结构
煤炭运输
煤粉
瓦斯
相互作用
质构
Sorption
Swelling
Coal
Gas
Porosity
Structure
Diffusion
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Summary:Transient sorption and desorption of helium and carbon dioxide in Upper Freeport coal powder and lumps were analyzed. Differences in texture and porosity between the powder and lumps may affect the transport and interaction of the penetrant and coal. In this work, we address macroscopic and mesoscopic structural differences between powdered and non-powdered coals that influence the rates of the gas transport kinetics and changes in coal texture （swelling, shrinkage, and changes in the pore structure and interconnectivity） and the reciprocal free-phase pressure decay （relaxation）. Com- parison of the multi-exponential relaxation time constants as a function of pressure, for CO2 and inert gas （helium）, allows us to postulate several mechanisms responsible for observed pressure decay patterns.
Bibliography:Vyacheslav N. Romanov, Lauren C. Graeser, Sinisha A. Jikich, Yee Soong, Gino A. Irdi（ U. S. Department of Energy, National Energy Technology Laboratory, P. O. Box 10940, Pittsburgh 15236, USA）
Coal ； Gas ； Porosity ； Structure ； Diffusion ； Sorption ； Swelling
Transient sorption and desorption of helium and carbon dioxide in Upper Freeport coal powder and lumps were analyzed. Differences in texture and porosity between the powder and lumps may affect the transport and interaction of the penetrant and coal. In this work, we address macroscopic and mesoscopic structural differences between powdered and non-powdered coals that influence the rates of the gas transport kinetics and changes in coal texture （swelling, shrinkage, and changes in the pore structure and interconnectivity） and the reciprocal free-phase pressure decay （relaxation）. Com- parison of the multi-exponential relaxation time constants as a function of pressure, for CO2 and inert gas （helium）, allows us to postulate several mechanisms responsible for observed pressure decay patterns.
10-1252/TD
ISSN:2095-8293
2198-7823
DOI:10.1007/s40789-015-0098-6