无烟煤热解过程中表面官能团的演变  

Evolution of Surface Function Group During Anthracite Coal Pyrolysis

作　　者：黄晓宏[1] 柳朝晖[1] 尹志强[1] 杨明[1] 张泰[1] 卢兴[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2013年第5期969-972,共4页Journal of Engineering Thermophysics

基　　金：国家科技支撑计划资助项目(No.2011BAC05B03);国家高技术研究发展计划资助项目(No.2009AA052315);国家自然科学基金重点项目(No.50936001);国家基金委创新研究群体基金(No.50721008)

摘　　要：FTIR和光谱的曲线拟合方法被用于研究无烟煤在高温O_2/N_2和O_2/CO_2气氛下热解时表面官能团的演变。为了揭示不同温度和气氛下热解过程中煤焦结构的变化规律,热解在不同的火焰环境(1670 K和1770 K,O_2/H_2O/CO_2/N_2)下开展。通过对比分析不同煤焦的红外光谱,得出以下结论:相比于N_2焦,CO_2焦含有更长的脂肪链或烷基侧链;由于煤焦表面化学吸附的CO_2在高温下与芳香环发生的裂解反应可以生成脂肪族共轭C=O,这使得CO_2焦含有更多的含氧官能团结构,同时也使得CO_2焦的芳香度略低于N_2焦。FTIR and curve-fitting method were used to study the evolution of surface functional groups of anthracite coal during Pyrolysis in O2/N2 and O2/CO2 atmosphere at high temperature. In order to reveal the evolution mechanism of char structure during pyrolysis in different temperatures and atmospheres, Pyrolysis experiments were carried out in different flame environments （1670 K and 1770 K, O2/H2O/CO2/N2）. Through the comparative analysis of different spectra, the following results are got： Compared to char-N2, char-CO2 contained longer aliphatic chain or alkyl side chain. The cracking reaction of CO2 absorbed in char surface and aromatic rings could generate more aliphatic conjugated C=O, which resulted that char-CO2 contained more O-containing structure and lead that the aromaticity of char-CO2 was lower than that of char-N2.

关 键 词：O_2 CO_2 无烟煤 煤焦 表面官能团 FTIR 

分 类 号：TK16[动力工程及工程热物理—热能工程]