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Summary: In this study, a self-built high-temperature tube furnace was used to heat coal samples at different temperatures and gas atmospheres in order to investigate the evolution of pore and fracture structures during spontaneous combustion of coal. X-ray CT technology was utilized to scan the coal samples and extract the three-dimensional pore structure and equivalent pore network model. The results showed that the porosity and fractal dimension of coal samples heat-treated in an air atmosphere were significantly higher than those heat-treated in a nitrogen atmosphere. The connectivity and permeability of the coal samples were also affected, with better connectivity observed in the air atmosphere. Nitrogen injection during heating had a stronger inhibitory effect on the development of pore and fracture structures, leading to decreased permeability. This research suggests that nitrogen injection can be an effective strategy to prevent and control coal spontaneous combustion.
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