Study on the influence of inhibitors on the characteristics of coal oxygen composite reactions

Abstract

Coal spontaneous combustion fires not only waste coal resources, but also restrict underground safety production. Therefore, research on natural prevention and control of coal fires is particularly important for ensuring coal mine safety production. Based on the theory of coal spontaneous combustion and the mechanism of inhibition, the inhibition performance of sodium hypophosphite inhibitors in the process of coal spontaneous combustion oxidation was studied. Firstly, the CO release and inhibition rates of coal samples and inhibited coal samples during the heating and oxidation process were calculated using a programmed heating method. Then, combined with infrared spectroscopy, the influence of hypophosphite on its surface functional groups during coal spontaneous combustion oxidation was studied from a microscopic perspective. Subsequently, thermogravimetric experiments were conducted to analyze the changes in the thermal characteristic curves of inhibited coal samples at different heating rates and particle sizes. Finally, a kinetic model was proposed to analyze the activation energy of the inhibition reaction. Results indicated that the addition of sodium hypophosphite has a natural inhibitory effect on the oxygen absorption and thermal decomposition stages of coal samples.