A study of the relationships between coal structures and combustion characteristics: The insights from micro-Raman spectroscopy based on 32 kinds of Chinese coals
A study of the relationships between coal structures and combustion characteristics: The insights from micro-Raman spectroscopy based on 32 kinds of Chinese coals
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煤结构与燃烧特性关系研究——基于中国32种煤的显微拉曼光谱分析
DOI：
10.1016/j.apenergy.2017.11.094
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发表时间：
2018-02
期刊：
影响因子：
11.2
通讯作者：
Jun Xiang
中科院分区：
文献类型：
--
作者：
Jun Xu;Hao Tang;Sheng Su;Jiawei Liu;Kai Xu;Kun Qian;Yi Wang;Yingbiao Zhou;Song Hu;Anchao Zhang;Jun Xiang
利用显微拉曼光谱和热重分析仪对我国32种煤的结构和燃烧特性进行了研究。通过对拉曼光谱的10个高斯谱带进行精细曲线拟合，研究了煤化过程中煤的结构变化。建立了煤的拉曼光谱参数与燃烧特性之间的关系。结果表明，低变质程度煤（干无灰基挥发分含量（Vdaf）> 25%）的挥发分含量降低主要是由于芳香取代基或脂肪族结构的丢失，而相对高变质程度煤（Vdaf> 25%）的挥发分含量增加，主要是由于在煤化作用下，芳香环沿着增长。煤中碳双键O结构随Vdaf的增加而单调增加。芳香环的缩合、碳双键O结构的丧失和大芳香环间“杂质”结构的减少都能提高煤的燃烧特征温度。煤的燃烧特征温度Ti、Tm、T波段拉曼光谱参数A（GR+VL+VR）/AD、AGL/ATotal、AS/AD、AD/ATotal之间分别存在合理的相关性，其相关性均优于Ti、Tm、T波段Vdaf之间的相关性。其中，拉曼光谱参数AD/ATotal是上述关键参数的组合，与煤的着火温度相关性最好，R2大于0.9。AD/ATotal可以作为煤炭燃烧特性的良好指标。本研究直接证明了拉曼光谱不仅可以作为煤的煤级/结构的探针，而且可以作为煤燃烧特性的探针，为快速预测煤的性质提供了新的途径。
Structures and combustion characteristics of 32 kinds of Chinese coals were studied by Micro-Raman spectroscopy and thermal gravimetric analyzer. Changes in coal structures with coalification were investigated by detailed curve-fitting the Raman spectrum with ten Gaussian bands. The relationships between the Raman spectral parameters and coal combustion characteristics were set up and evaluated. The results indicate that the loss of aromatic substituents or aliphatic structures can be responsible for the decrease of Vdaffor low rank coals (volatiles content in dry ash-free basis (Vdaf) > 25%), while the rapid growth of aromatic rings along with the increase of cross-linking density of coals mainly occurs under coalification for relative high rank coal (Vdaf> 25%). Besides, C double bond O structures in coal increase monotonously with the increase of Vdaf. The condensation of aromatic rings, loss of C double bond O structures and reduction of “impurity” structures among large aromatic rings all can increase the coal combustion characteristic temperatures. Reasonable correlations between the coal combustion characteristic temperatures: Ti, Tm, Tband Raman spectral parameters: A(GR+VL+VR)/AD, AGL/ATotal, AS/AD, AD/ATotalhave been found respectively, and the relationships are all better than that between Ti, Tm, Tband Vdaf. Particularly, the Raman spectral parameter AD/ATotalis a combination of above key parameters and related to the coal ignition temperature best with the R-square higher than 0.9. AD/ATotalcan act as a good indicator for coal combustion characteristics. This study directly demonstrates that Raman spectroscopy can play a probe not only for coal ranks/structures but also coal combustion characteristics and it can provide a new approach to rapidly predict the coal properties.
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