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
