Development and application of the low-temperature oxidation experimental system for compacted broken coal

Abstract：In order to obtain the comprehensive effects of the stress, temperature and moisture on coal spontaneous combustion in the gob, a low-temperature oxidation experimental system was developed based on multi-field coupling theory and current testing technology.The changing of stress, temperature, moisture and seepage environment could be realized on the system, and the evolution law of permeability parameters of broken coal in gob under different stress, temperature and moisture conditions could be tested, so that the current situation unloading stress could be changed in the low-temperature coal oxidation.The experimental method for coal spontaneous combustion had been improved to a certain extent, which provided a way for the following study of the multi-field coupling oxidation mechanism and the difference of oxidation dynamic behavior of loaded broken coal.The low-temperature oxidation characteristics of broken coal under confining pressure were tested with the system, and the effects of stress, temperature and moisture on the accumulation state and low-temperature coal oxidation process were identified.

Keyword：low-temperature oxidation;compacted broken coal;permeability characteristic;