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

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,台湾 云林 64002

煤矸石; 自燃; 程序升温; 热重-傅里叶红外光谱

Spontaneous combustion characteristics and micro characterization of coal gangue based on thermogravimetry-fourier tromsform infrared spectrometer
DENG Jun 1,2,LI Bei1,XIAO Yang1,2,MA Li3,XU Qi-ming3

(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China; 3.Department of Safety,Health,and Environmental Engineering,Yunlin University of Science and Technology,Yunlin 64002,China)

coal gangue; spontaneous combustion; temperature programming; TG-FTIR

DOI: 10.13800/j.cnki.xakjdxxb.2017.0101

备注

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 was 0.88 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.