Selective enrichment of chemical structure during first grinding of Zhundong coal and its effect on pyrolysis reactivity
Selective enrichment of chemical structure during first grinding of Zhundong coal and its effect on pyrolysis reactivity
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准东煤初磨过程中化学结构的选择性富集及其对热解反应活性的影响
DOI：
10.1016/j.fuel.2016.10.083
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发表时间：
2017-02
期刊：
影响因子：
7.4
通讯作者：
Liu Huanpeng
中科院分区：
文献类型：
--
作者：
Zhao Yan;Qiu Penghua;Chen Gang;Pei Jiangtao;Sun Shaozeng;Liu Li;Liu Huanpeng
煤岩显微组分和无机矿物在磨煤过程中的选择性富集对热解反应性有明显影响。采用傅里叶变换红外光谱（FT-IR）和热重分析（TGA）研究了准东不同粒度煤样的化学结构和热解过程，并分别采用一系列原始红外结构参数和综合挥发分指数对准东煤样进行了半定量表征。首次从分子尺度上揭示了准东煤中不同组分的选择性富集，并建立了准东煤红外结构参数与热解反应性之间的相关性。结果表明，随着粒度的减小，灰含量逐渐降低，红外结构参数Ia 3能有效地表征灰含量的降低，总氢含量经历了稳定-还原-稳定的过程，脂肪氢与芳香氢的比值经历了还原-稳定-还原的过程;脂肪族侧链或桥键逐渐变长，而高度取代的芳香环倾向于集中在−106 + 80 μm颗粒中，这些颗粒芳香结构中氢原子的平均丰度达到最大值;碳双键O结构的含氧官能团集中在最小颗粒中，碳单键O结构的含氧官能团集中在−106 + 80 μm颗粒中，颗粒的热解反应活性逐渐降低.最后，建立了准东煤的红外结构参数S（及其修正形式）与热解反应性之间的关联式，证明该关联式可有效预测准东煤的热解反应性。
The selective enrichment of macerals and inorganic minerals during coal grinding may have an obvious effect on pyrolysis reactivity. In this paper, chemical structures and pyrolysis processes of Zhundong coal samples with different particle sizes were investigated by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA), then semi-quantitatively characterised by a series of original infrared structural parameters and a comprehensive devolatilization index, respectively. The selective enrichment of different components in Zhundong coal was revealed on a molecular scale for the first time, and finally a correlation was established between the infrared structural parameters and pyrolysis reactivity. It is indicated that the decrease in particle size results in the following trends: the ash content gradually becomes lower, which can be effectively characterised by the infrared structural parameter,Ia3; the total hydrogen content undergoes a Stable-Reduced-Stable process, while the ratio of aliphatic hydrogen to aromatic hydrogen undergoes a Reduced-Stable-Reduced process; the aliphatic side chains or bridge bonds gradually become longer, while the highly substituted aromatic rings tend to concentrate in the −106 + 80 μm particles, and the average abundance of hydrogen atoms in aromatic structures of these particles is up to the maximum; the oxygen-containing functional groups with Cdouble bondO structures concentrate in the smallest particles, while the ones with Csingle bondO structures concentrate in the −106 + 80 μm particles; and the pyrolysis reactivity of particles gradually decreases. Finally, a correlation was established between the comprehensive infrared structural parameterS(as well as its modified form) and the pyrolysis reactivity, which was proved to be effective to predict the pyrolysis reactivity of Zhundong coal.
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