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为了研究煤在自燃过程中会出现温度上升突然加快所产生的原因,为煤矿现场煤炭自然火灾的防治工作提供理论依据,采用绝热法、程序升温法对北皂褐煤氧化过程中自热升温特性、耗氧、CO,CO2气体产物特性的研究,提出煤的氧化过程具有分阶段性,主要可以分为2个阶段:低温缓慢氧化阶段和高温快速氧化阶段;并采用原位傅里叶红外光谱实时连续地采集了北皂褐煤表面主要活性官能团在氧化过程中的变化规律。实验结果表明:煤的分阶段特性主要是由于OH的反应导致的,OH反应吸热是低温阶段热量难以积聚的主要原因,当OH反应消耗殆尽时,煤中热量迅速积聚,煤温迅速升高。
In order to study the cause of sudden increase of temperature in coal spontaneous combustion process, this study provides a theoretical basis for the prevention and control of coal spontaneous combustion in coal mine site. Adiabatic and programmed temperature methods are used to study the self-heating characteristics, Oxygen, CO, CO2 gas product characteristics of the proposed coal oxidation process has a phased, can be divided into two phases: slow oxidation at low temperature and rapid oxidation stage; and in situ Fourier transform infrared spectroscopy real-time The changes of the main active functional groups on the surface of Bei lignite during the oxidation process were continuously collected. The experimental results show that the staged characteristics of coal are mainly caused by the reaction of OH. The endothermic reaction of OH is the main reason that the heat is hard to accumulate in the low temperature stage. When the OH reaction is exhausted, the heat in the coal rapidly accumulates and the coal temperature rapidly increases high.