摘要
为研究煤氧化自燃的反应机理,对4种不同煤样进行热重实验取得TG-DSC曲线,运用Starink法求解出煤样在达到着火点之前的表观活化能,对煤的氧化自燃过程进行研究。研究结果表明:煤的氧化自燃过程大致分为失水、氧化和燃烧3个阶段,煤的氧化阶段对煤的自燃起到关键性的作用,并且煤在氧化阶段的表观活化能随温度的升高而逐渐升高。煤样的吸氧量的大小与氧化阶段的最大表观活化能成反比,越容易发生自燃的煤样,吸氧量越大,氧化阶段的最大表观活化能越小。因此可以采用煤氧化阶段的最大表观活化能作为一项指标鉴定煤自燃倾向性。
In order to study the reaction mechanism of coal oxidizing spontaneous combustion, the TGDSC curve was obtained by thermogravimetric experiments on four different coal samples. The Starink method was used to solve the activation energy of the coal sample before reaching the ignition point,and the oxidative spontaneous combustion process of coal was studied. The results show that the oxidative spontaneous combustion process of coal is roughly divided into three stages: dehydration stage, oxidation stage and combustion stage. The oxidation stage of coal plays a major role in the spontaneous combustion of coal, and the apparent activation energy of coal in oxidation stage with temperature increase and gradually increase. The amount of oxygen absorbed by the coal sample is inversely proportional to the maximum apparent activation energy of the oxidation stage. The more spontaneous coal sample is likely to occur, the larger the oxygen uptake, the smaller the maximum apparent activation energy of the oxidation stage. Therefore, the maximum apparent activation energy of the coal oxidation stage can be used as an indicator to identify the spontaneous combustion tendency of coal.
作者
李绪萍
贺李炜
张金山
陈映光
闫晓宇
LI Xu-ping;HE Li-wei;ZHANG Jin-shan;CHEN Ying-guang;YAN Xiao-yu(Institute of Mining,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《煤炭技术》
CAS
2020年第4期129-132,共4页
Coal Technology
关键词
煤自燃
热重
Starink法
表观活化能
煤自燃倾向性
coal spontaneous combustion
thermogravimetry
Starink method
apparent activation energy
coal spontaneous combustion tendency
