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The evolution and formation mechanisms of closed pores in coal
- Source :
- Fuel. 200:555-563
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Closed pores, which have been confirmed to exist in coal, have a dual significance in illustrating the tremendous gas outburst content in coal mining and ascertaining the exact methane content in coal, although it is unknown if this methane can be exploited and utilized. In this paper, the principal objective is to explore the evolution and formation mechanisms of closed pores, regarding which there is a lack of knowledge and understanding. We investigated the varieties of closed pore contents in coalification, combining the small angle X-ray scattering (SAXS) and liquid nitrogen adsorption methods (LNA), and simultaneously analyzed the surface topography of closed pores by scanning electron microscopy (SEM). The closed pore volume represents a low-high-low evolution trend during coalification owing to the appearance of gas pores in the pyrogenic hydrocarbon generation stage. However, the specific surface area increases uniformly due to the increase in the number of micro-pores. The tectonic deformation effect impels the increase of closed pores, which reflected in the larger pore volume and specific surface area in strong deformation coal than that in weak deformation coal. The genesis of closed pores can be summarized as a result of heterogeneous matrix shrinkage, the tectonic compressive stress and the tectonic shear stress. Finally, this work provides a novel method to investigate the mechanism of geological CO 2 sequestration.
- Subjects :
- Work (thermodynamics)
Materials science
business.industry
020209 energy
General Chemical Engineering
Organic Chemistry
Coal mining
Energy Engineering and Power Technology
Mineralogy
02 engineering and technology
Deformation (meteorology)
Methane
Matrix (geology)
chemistry.chemical_compound
Fuel Technology
020401 chemical engineering
chemistry
Specific surface area
0202 electrical engineering, electronic engineering, information engineering
Shear stress
Coal
0204 chemical engineering
business
Subjects
Details
- ISSN :
- 00162361
- Volume :
- 200
- Database :
- OpenAIRE
- Journal :
- Fuel
- Accession number :
- edsair.doi...........8757cd7d74329e8f430eeebc98dd297c