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Fractal characterization was conducted on coal samples collected from shallow and deep coal mine layers, to better understand the process required to exploit deep layer coal bed methane (CBM). Data from N 2 adsorption/desorption isotherms were used to assess the irregularities of coal pore surfaces (Ds) and the heterogeneities of pore structures (Dp) on the basis of modified Frenkel–Halsey–Hill...
In this study, a series of laboratory experiments were performed to firstly analyze the characteristics of the pore structure in low-rank coal (Ro<0.70%), and then relationships between fractal dimensions and coal rank, coal composition and pore structure, and their impacts on methane adsorbability and seepage ability were studied too. The desorption isotherms of low-rank coal mainly belongs to...
The characteristics of micropore (0.32–2 nm), mesopores (2–50 nm) and fractal dimensions of bituminous coal during the process of cyclic gas adsorption/desorption were revealed by combining N2 (77 K) and CO2 (273 K) adsorption experiments from microscopic aspect. The results indicate that the pore structure characterization in the coal matrix are changed, resulting in decreased mesopore volumes and...
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