Abstract
The fractal characteristics of pore structures in six coal samples with the same rank were investigated. Insights into the relationship between fractal dimension and pore structure parameter were provided. Compressibility effect on the mercury intrusion porosimetry (MIP) data was evaluated. N 2 adsorption (NA) and mercury intrusion porosimetry were applied to analyze the pore structure of coal. The mercury intrusion process was divided into three stages including interpore filling, large intrapore filling and small intrapore filling with compression. Three pore fractal dimensions corresponding to the three stages, D 1C , D 2C , and D 3C were calculated with the Brooks–Corey capillary pressure model. D f calculated with Farin model is used to estimate an overall fractal dimension. The correlation between the pore fractal dimension and the pore size distribution (PSD) characteristics was further discussed.
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