低阶煤在无氧和有氧升温中产生CO规律研究

Law of CO Production of Low-grade Coal in Anaerobic and Aerobic Warming

利用程序升温氧化和时间分辨红外光谱仪实验装置,开展了大南湖一矿3#煤层无氧和有氧升温氧化实验,分析了在升温氧化过程中CO体积分数变化规律及CO吸收峰在时间分辨红外光谱仪的光谱图,阐明了煤在无氧和有氧升温过程中CO产生规律。结果表明:室温至200℃,此阶段不产生CO或产生极少量的CO;400~700℃,煤样失重显著增加,热重曲线快速下降,煤分子中的某些共价键发生断裂,产生了一定量的CO,其峰值约为2.3×10^(-5)。煤在有氧条件下产生CO的初现温度为36℃,煤温低于189℃时,CO体积分数与煤温之间符合幂指数变化关系,111℃是煤进入加速氧化阶段的临界温度。

The programmed heating and oxidation and time-resolved infrared spectrometer experimental device were used to carry out the experiment of the oxygen and thermostat oxidation of the 3#coal seam in Dannanhu No.1 Coal Mine.This paper analyzed the variation rule of CO volume fraction and the spectra of CO absorption peak in the time-resolved infrared spectrometer,and expounded the law of CO production in the process of anaerobic and aerobic heating of coal.The results show that from room temperature to 200℃,CO gas is not generated or a small amount of CO gas is generated;400-700℃,the weight loss of coal samples has increased significantly,the thermal weight curve drops rapidly,and some covalent bonds in coal molecules break,producing a certain amount of CO,and its peak is about 2.3×10^(-5).The initial temperature of CO generation from coal under aerobic conditions is 36℃.When the coal temperature is lower than 189℃,the relationship between the volume fraction of CO and the coal temperature conforms to a power exponential change.111℃is the critical temperature for accelerated oxidation of coal.