针对采空区煤炭自燃与瓦斯爆炸耦合复杂作用机理等问题,通过实验室实验和理论分析,研究了煤体自燃过程中多种气体竞争吸附与解吸特性,分析了采空区含瓦斯条件下煤体自燃及气体逸出规律,获得了采空区多组分气体及温度区域性动态分布特征。结果表明:采空区煤炭自燃温度是影响瓦斯密度变化和瓦斯聚集的重要因素。采空区通风漏风量与煤自燃强度相关,与采空区甲烷聚集范围有关。在煤体自燃初期,采空区氧气和甲烷分布受温度影响较小。随着温度升高,煤体中瓦斯迅速解吸,吸附的氮气也产生相同的变化趋势。采空区瓦斯浓度越高,煤体氧化生成的CO量越多,混入甲烷后,在高温条件下逐渐生成CO和CO2。该研究为采空区煤与瓦斯灾害预警指标建立提供了理论支持。

In response to the complex coupling mechanism between coal spontaneous combustion and gas explosion in goaf areas, through laboratory experiments and theoretical analysis, the competitive adsorption and desorption characteristics of various types of gases during coal body spontaneous combustion process are studied. The laws of coal body spontaneous combustion and gas escape under gas containing conditions in goaf are analyzed, and the regional dynamic distribution characteristics of multi-component gases and temperatures in goaf are obtained. The results indicate that the spontaneous combustion temperature of coal in goaf is an important factor affecting changes in gas density and gas accumulation. The ventilation air leakage quantity in goaf is related to the intensity of coal spontaneous combustion and the range of methane accumulation in goaf; In the early stage of coal body spontaneous combustion, the distribution of oxygen and methane in the goaf is less affected by temperature. As the temperature increases, the gas in coal rapidly desorbs, and the adsorbed nitrogen also exhibits the same trend of change. The higher the gas concentration in the atmosphere, the more CO quantity is generated from coal oxidation. After adding methane to the airflow, CO and CO will gradually form under high temperature conditions. This study provides theoretical support for the establishment of early warning indicators for coal and gas disasters in goaf.