基于热重-傅里叶红外光谱联用的煤矸石自燃特性及微观表征  

Spontaneous combustion characteristics and micro characterization of coal gangue based on thermogravimetry-fourier tromsform infrared spectrometer

作　　者：邓军[1,2] 李贝[1] 肖旸[1,2] 马砺 徐启铭 

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]教育部西部矿井开采及灾害防治重点实验室,陕西西安710054 [3]台湾云林科技大学安全、健康与环境工程系,中国台湾云林64002

出　　处：《西安科技大学学报》2017年第1期1-6,共6页Journal of Xi’an University of Science and Technology

基　　金：国家自然基金(51134019);国家自然科学基金(51574193);陕西省自然科学基金(2014JM7276);陕西省工业科技攻关(2016GY-191)

摘　　要：煤矸石自燃造成严重的环境和生态问题,为揭示煤矸石自燃宏观特性及微观结构之间的关联性,采用热重-傅里叶红外光谱(TG/FTIR)联用技术及自燃程序升温实验,系统研究了煤矸石自燃氧化过程失重率、气体产生率和官能团变化规律及自燃特性。结果表明,煤矸石中存在次甲基、含氧环烷、醚键等桥键和缩合芳环等物质,自燃氧化过程总失重率30.30%.得到了煤矸石自燃过程中7个特征温度,气体脱附、氧化裂解、燃烧和热活化及相变阶段的失重率分别为1.05%,3.27%,20.36%和5.31%.计算得到煤矸石燃料比为0.88,综合燃烧特性指数S为32.34×10^(-11)%2·min^(-2)·K^(-3),说明试样挥发分析出速率快、极易着火燃烧、燃尽性能好,具有较高的自燃氧化及着火燃烧特性。Spontaneous combustion of coal gangue（ CG） causes serious environmental and ecological problems. The oxidation characteristics of coal gangue,such as mass loss rate,gas production rate and functional group change were studied using thermogravimetry-fourier transform infrared spectrometer（ TG-FTIR） technique and temperature programming experiment. FTIR spectrums indicated that coal gangue contained analogous hydroxyl,aliphatic,functional group,and aromatic compounds. Meanwhile,the results showed that the total weight loss ratio of CG was about 30. 30% in the oxidation process; the CG spontaneous combustion process was divided into four phases,the weight loss at each stage was 1. 05%,3. 27%,20. 36%,and 5. 31%,respectively. The calculated fuel ratio of CG was0. 88 and the integrated combustion characteristic index（ S） was 32. 34 × 10^-11%2·min^-2·K^-3,which indicated that the sample of Wuhai CG has good oxidation and spontaneous combustion ignition property. The devolatilization rate is fast and the CG is easy to ignite.

关 键 词：煤矸石 自燃 程序升温 热重-傅里叶红外光谱 

分 类 号：TD75[矿业工程—矿井通风与安全]