Journal
ENERGY
Volume 242, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.122986
Keywords
Long-term adsorption; Pore structures; Fractal dimension; Microcrystalline structure; Uniaxial compressive strength
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Funding
- National Natural Science Foundation of China [51674049, 52074044, 51804107, 51874053]
- Postdoctoral Science Foundation of the State Key Laboratory of Coal Mine Disaster Dynamics and Control [2011DA105287-BH201905]
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The study revealed that the proportion of macropores in coal increased while the proportion of mesopores decreased after CH4 or CO2 treatment, leading to a looser coal structure. The microcrystalline structure parameters also changed significantly, indicating the evolution of coal pore structures under long-term gas adsorption.
In order to study the influence of adsorptive gas on coal pore structures and mechanical strength, coal specimens were placed in a low-pressure environment of CH4 or CO2 for 30 days to ensure that the specimens were saturated and fully interacted with the gas. Low-pressure nitrogen adsorption, scanning electron microscope, X-ray diffraction, and uniaxial compressive strength tests were employed to study coal's microstructure change and strength characteristics. The results show that after CH4 or CO2 treatment, the proportion of macropores increases by 38.87% and 22.89%, and that of mesopores decrease by 6.34% and 3.73%, respectively, which indicates the evolution of mesopores to macropores. The microcrystalline structure parameters change obviously after long-term gas adsorption treatment. The values of d(002) and d(100) increase, while L-c, L-a, and M-c's values both decrease, resulting in a loose coal structure. Besides, a conceptual model is proposed to explain the evolution mechanism of pore structures under the effect of long-term gas adsorption. (C) 2021 Elsevier Ltd. All rights reserved.
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