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Selective enrichment of chemical structure during first grinding of Zhundong coal and its effect on pyrolysis reactivity

机译：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的影响。

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摘要

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, I-a3; 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 mu m 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 C=O structures concentrate in the smallest particles, while the ones with C-O structures concentrate in the -106 + 80 mu m particles; and the pyrolysis reactivity of particles gradually decreases. Finally, a correlation was established between the comprehensive infrared structural parameter S (as well as its modified form) and the pyrolysis reactivity, which was proved to be effective to predict the pyrolysis reactivity of Zhundong coal. (C) 2016 Elsevier Ltd. All rights reserved.
机译：磨煤过程中矿物和无机矿物的选择性富集可能对热解反应性有明显的影响。本文通过傅里叶变换红外光谱（FT-IR）和热重分析（TGA）研究了不同粒径的准东煤样品的化学结构和热解过程，然后通过一系列原始的红外结构参数进行了半定量表征。全面的脱挥发分指标。首次在分子尺度上揭示了准东煤中不同组分的选择性富集，最终建立了红外结构参数与热解反应性之间的相关性。结果表明，粒径的减小导致以下趋势：灰分逐渐降低，这可以通过红外结构参数I-a3有效地表征。总氢含量经历稳定降低-稳定过程，而脂族氢与芳族氢的比例经历降低稳定-降低过程；脂族侧链或桥键逐渐变长，而高度取代的芳环则倾向于集中在-106 + 80μm颗粒中，这些颗粒的芳族结构中氢原子的平均丰度最大。具有C ＝ O结构的含氧官能团集中在最小的颗粒中，而具有C-O结构的含氧官能团集中在-106 +80μm的颗粒中。颗粒的热解反应性逐渐降低。最后，建立了综合红外结构参数S（及其修饰形式）与热解反应性之间的相关性，证明对预测准东煤的热解反应性有效。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第1期|46-56|共11页
  • 作者

    Zhao Yan; Qiu Penghua; Chen Gang; Pei Jiangtao; Sun Shaozeng; Liu Li; Liu Huanpeng;

  • 作者单位

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China|Shenyang Acad Environm Sci, Shenyang 110167, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China;

    Shenyang Acad Environm Sci, Shenyang 110167, Peoples R China;

    Shenyang Acad Environm Sci, Shenyang 110167, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Zhundong coal; Particle size; FT-IR; Curve fitting; Infrared structural parameter; Pyrolysis;

    机译：准东煤;颗粒尺寸;FT-IR;曲线拟合;红外结构参数;热解;

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