利用拉曼光谱研究大柳塔煤热解焦结构及其燃烧性能

Study on structure and combustion performance of Daliuta coal pyrolysis char by Raman spectroscopy

以大柳塔煤为研究对象,利用拉曼光谱研究了大柳塔原煤、富镜质组煤样、富惰质组煤样和脱矿煤样的热解焦结构以及热解煤焦的燃烧性能。结果表明,相同热解条件下,相比于大柳塔原煤样热解焦,脱矿煤样热解焦具有更多的大芳香环结构(≥6环)、更高的着火温度和更低的燃烧性能;相比于富镜质组煤样热解焦,富惰质组煤样热解焦的大芳香环结构含量更高,燃烧性能更低,且富惰质组煤焦的燃尽能力明显低于富镜质组煤焦的燃尽能力。大柳塔煤焦的着火温度(t_(i))、燃烧反应性指数(t_(index))和拉曼光谱D峰的位移(W_(D))具有较好的相关性,二次曲线拟合得到关联式的相关系数R^(2)分别为0.9159和0.7133,但燃尽温度和W_(D)无明显相关性,说明大柳塔煤焦的炭结构对煤焦的着火温度和燃烧反应性指数具有规律性的影响,但对煤焦燃尽能力的影响没有规律性。

In this study,the structure and combustion performance of pyrolysis chars from Daliuta raw coal,vitrinite-rich sample,inertinite-rich sample and demineralized coal sample were studied by Raman spectroscopy.The results showed that under the same pyrolysis conditions,compared with the pyrolysis char from Daliuta raw coal sample,the pyrolysis char from the demineralized coal sample has more large aromatic ring systems(≥6 rings),higher ignition temperature and much low combustion performance.The combustion performance of pyrolysis char from inertinite-rich sample is lower than that from vitrinite-rich sample,and the burnout capacity of pyrolysis char from inertinite-rich sample is far lower than that from vitrinite-rich sample.The ignition temperature(t_(i)),the combustion reactivity index(t_(index))and the wavenumber of D band(W_(D))in the Raman spectrum of Daliuta coal char has a good correlation;the correlation coefficients R^(2) obtained by the quadratic curve fitting are 0.9159 and 0.7133,respectively.There is no obvious correlation between burn-out temperature and W_(D) of Daliuta coal char,indicating that the carbon structure of Daliuta coal char has a significant impact on the ignition temperature and combustion reactivity index of the char,but is no regular effect on the burn-out ability of the char.