Research on the characteristics of intelligent gel in inhibiting coal spontaneous combustion
摘要
In order to effectively prevent coal spontaneous combustion, this study incorporated melatonin into inflatable thermosensitive hydrogel with a view to developing an intelligent gel as composite inhibitor. By means of electron spin resonance, thermogravimetry and diffuse reflection fourier transform infrared, the characteristics and inhibitory path of intelligent gel inhibiting coal spontaneous combustion were clarified from the aspects of microscopic and macroscopic properties. The findings indicated that intelligent gels with varying melatonin additions have the capacity to impede the oxidation process through heat absorption, oxygen barrier effect, and capture of reactive radicals. This resulted in a decline in the concentration and number of free radicals, as well as characteristic temperatures. The introduction of a small amount of melatonin enhanced the blocking effect and delayed the maximum water loss rate temperature 11.55 °C, the dry cracking temperature 24.03 °C. The average apparent activation energy of the initial mass loss stage and the slow oxidation stage increased by 49.44 and 115.87 kJ mol−1. When considered in conjunction with the law of functional group evolution, it is evident that intelligent gel had a substantial impact on the inhibition of coal spontaneous combustion. At 30–120 °C, the process of coal oxygenation was retarded by the oxygen barrier-cooling effect of intelligent gel, which established an anoxic environment. Blunted the oxidative decomposition of oxygen-containing functional groups. At 120–240 °C, the physicochemical synergy increased the peak area of carbonyl and ether oxygen functional groups. The research results provide a theoretical basis for the efficient prevention and control of coal spontaneous combustion in goaf.