煤升温氧化过程中气体解析规律研究

Study on the law of gas releasing in the process of coal oxidation and war ming-up

为了防止煤炭自燃，深入了解煤在升温氧化过程中气体的释放规律，利用煤升温氧化实验系统，对太原组和山西组煤进行了升温氧化实验．结果表明，太原组和山西组煤在升温氧化过程中，不同气体有不同的释放临界温度和速率，20～160℃为煤的缓慢氧化阶段，从煤中缓慢释放出被吸附的C，气体CO，CO2，CH4和C2～C3的烯烃C2H4，C3H6等；160～210℃为煤的快速氧化阶段，从煤中释放出较大量的C2～C4的烷烃C2H6，C3H8和C4H10等，烃的体积分数以指数速率增加；210～280℃为煤的急速氧化阶段，上述C2～C4气体的体积分数几乎以直线关系急剧增加．不同类型的煤在不同的氧化阶段具有不同的氧化特征，可选择不同的气体作为预测煤自燃特性的标志气体．

In order to prevent spontaneous combustion of coal, deeply understand laws of the gases releasing in the process of warming - up, a warming - up experimental study for the group of Taiyuan and the group of Shanxi is made with the experimental system of coal warming - up and oxidation. The results show that： in the process of warming - up and oxidation for the Taiyuan Group and the Shanxi Group, different types of gas have different critical temperature and release rate. Coal oxidation process slowly in the temperature of 20 - 160℃ , which firstly slowly releases material of C1, for example CO, CO2, CH4 and C： -C3 olefins C2H4, C3H6 that is adsorbed. The temperature of 160 -210℃ is the process of oxidation rapidly, the coal releases a large - scale of the C2 - Ca alkenes C2H6 , C3H8 and Call10, the exponential relationship between the release rate increase. The temperature of 210-280 ℃ for the rapid oxidation of coal, the C1-C4 gas releases rate almost linear relations between increased dramatically. Different types of coal in different stages has different oxidation characteristics, which are all can be choosen as forecast signs of spontaneous combustion of coal.