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Coal is China's main energy source and fuel. Coal spontaneous combustion is  one of the most prominent issues that threaten the production safety of coal  mining, storage, and transportation. In order to explore the factors  affecting coal spontaneous combustion, we explored the pore structure  characteristics of the coal based on the fractal theory, through the  low-temperature liquid nitrogen adsorption experiment of coal. The fractal  dimension of the coal sample was calculated, and the oxygen adsorption  quantity of the same coal sample was obtained by using the physical  adsorption experiment of coal. Experimental and fitting results showed that  coal sample has obvious surface fractal dimension features and pore  structure fractal features. Fractal dimension expressed coal oxygen  adsorption well. In the meantime, the coal samples with lower fractal  dimension, higher temperature, smaller porosity usually have less oxygen  adsorption quantity. This research can not only enrich the study of oxygen  adsorption in porous media such as coal, but also help to understand its  spontaneous combustion mechanism in depth, thereby reducing the occurrence  of spontaneous combustion disasters.

Study of fractal based oxygen adsorption experiment of porous coal