Study on the influence of solvent extraction on thermal property parameters of coal oxidation

The determination of the influence law of coal molecular active structure on its oxidation and exothermic characterization parameters is one of the keys to effectively prevent coal spontaneous combustion, but it is difficult to quantify the influence of specific group structure on coal spontaneous combustion, and solvent extraction technology can peel the structure of coal molecular active group to explore effective coal spontaneous combustion reduction technology. In this paper, the coal sample from Caojiatan Coal Mine was treated by solvent extraction technology. The extracted coal sample was tested by STA 8000-Spectrum thermal analysis instrument, and the influence of coal sample extraction on the characterization parameters of oxidation thermal physical properties was studied. The results show that the thermal physical properties of the raffinate coal sample are different from the original coal group. The mass of the raffinate coal sample decreases in the mass gain stage on the TG curve, the mass loss rate decreases in the combustion stage on the DTG curve, and the absolute area of heat release decreases on the DSC curve. The extraction reagent mainly reduces the coal mass entering the combustion stage by weakening the early reactivity of coal, and then inhibits the thermal release power of coal spontaneous combustion reaction to prevent the effect of coal spontaneous combustion. This study will provide a new idea for the development and innovation of coal spontaneous combustion active prevention and control technology.