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A comparative study on thermal behavior of functional groups in coals with different ranks during low temperature pyrolysis

机译：低温热解煤中官能团热行为的比较研究

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摘要

Pyrolysis has widely found applications in the processes of coal conversion and utilization. Good understanding of its reaction mechanism contributes to the optimization of coal conversion process and the controlling of the emission of pollutants during coal utilization. The evolution of the six main functional groups in coal with different ranks during pyrolysis was compared based on the data from in-situ transmission FTIR. As the increase of the coal rank, the initial temperature for the primary decomposition of aliphatic group rises and the remaining proportion at the final temperature gets bigger due to the more stable aliphatic structure in the high rank coal. The evolution of methyl, methylene and methine presents more detailed information in different rank coal. For the decomposition of aromatic C-H in the three relatively low rank coals, there are two stages: the decreasing stage and the increasing stage with temperature rising. The temperature range of the decreasing stage depends on the interaction of coal molecules, while the growth extent of aromatic C-H in the increasing stage can indicate the degree of the substitutions at the aromatic rings. Both aromatic C--C and C-O in the two high rank coals decrease slower in the high temperature stage than in the low temperature stage, while the situation is opposite for the two low rank coals. The number of C--O type decrease with the rising of coal rank. Among the six functional groups, OH is the most insensitive to the coal rank. For kinetics analysis, the pattern of activation energy for the loss of the four functional groups in different rank coals is presented. The activation energy for the decomposition of aliphatic groups and OH in the high temperature stage is much higher than that (50 kJ center dot mol- 1) in the low temperature stage. The decomposition of C-O and C--O shows relatively low activation energies in all stages. The kinetic models are mostly one way diffusion and nth order chemical reaction and the preexponential factor appears obvious compensation effect with the activated energy.
机译：热解在煤炭转换和利用过程中广泛发现了应用。良好地理解其反应机制有助于优化煤炭转换过程和煤炭利用期间污染物排放的控制。基于来自原位透射FTIR的数据进行比较了与热解中不同等级的煤中六个主要官能团的演变。随着煤炭等级的增加，脂族基团主要分解的初始温度升高，并且最终温度的剩余比例由于高级煤中更稳定的脂族结构而变大。甲基，甲基和甲基甲基的演变在不同等级煤中提供了更详细的信息。对于在三个相对低的煤中的芳族C-H的分解，有两个阶段：降低阶段和温度升高的增加阶段。降低阶段的温度范围取决于煤分子的相互作用，而芳族C-H在增加阶段的生长程度可以指示芳环中的取代度。两个高级煤中的芳族C-C和C-O都减少了高温阶段的较慢，而在低温阶段的情况下，这种情况与两个低级煤相反。随着煤炭级别的上升，C - O型的数量减少。在六个官能团中，OH是对煤炭等级最不敏感的。对于动力学分析，提出了用于在不同等级煤中失去四个官能团的活化能量的模式。用于在高温阶段分解脂族基团和OH的激活能量远高于低温阶段的（<50kJ中心点Mol-1）。 C-O和C-O的分解显示了所有阶段的相对较低的激活能量。动力学模型大多是一种方式扩散和第n阶化学反应，并且PREexponention因子与激活的能量看起来明显的补偿效果。

著录项

  • 来源
    《Journal of Analytical & Applied Pyrolysis》 |2021年第9期|105258.1-105258.10|共10页
  • 作者

    Niu Zhiyuan; Liu Guijian; Yin Hao; Zhou Chuncai; Wu Dun; Tan Feifei;

  • 作者单位

    Nanjing Xiaozhuang Univ Sch Environm Sci Nanjing 211171 Peoples R China|Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Hefei Univ Technol Sch Resources & Environm Engn Hefei 230009 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Nanjing Univ Finance & Econ Jiangsu Ind Dev Res Inst Nanjing 210023 Jiangsu Peoples R China;

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

    Coal pyrolysis; Functional groups; In-situ FTIR; Kinetic analysis; Coal rank;

    机译：煤热解;功能群;原位FTIR;动力学分析;煤炭等级;

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