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Transformation of nitrogen and sulphur impurities during hydrothermal upgrading of low quality coals

机译：低质煤水热改造过程中氮，硫杂质的转化

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摘要

The influence of hydrothermal upgrading on the configuration of nitrogen and sulphur species in coal was investigated in this paper. Hydrothermal modification of three typical Chinese lignite was performed at 200 degrees C, 250 degrees C and 300 degrees C. It was found that hydrothermal modification reduced the moisture content of coal and therefore increased the heating value. X-ray photoelectron spectroscopy (XPS) was used to analyze the speciation of nitrogen and sulphur in coal samples before and after the hydrothermal modification. XPS peak fitting analysis was performed by using the XPSPEAK points-peak software. Results showed that the hydrothermal treatment destroyed micro-structures and altered the functional groups of nitrogen and sulphur in coals. Nitrogen, which originally detected as a pyrollic peak (N-5), was converted to pyridic (N-6) or quaternary nitrogen (N-Q) species after the hydrothermal upgrading. Quaternary nitrogen associated with polycyclic aromatic hydrocarbon was converted to N-6 while N-Q molecules located at the coal edge transformed to nitrogen oxides (N-X). Sulphoxides, sulphones and sulphides were converted to thiophenes; alternatively, sulphides transformed to pyrite. These changes could result in a decrease in SO2 emission. Furthermore, there may be the transformation form sulphoxide and sulphone to sulphonates. Organic sulphur, to some extent, transformed to inorganic sulphur during the hydrothermal process. (C) 2015 Published by Elsevier Ltd.
机译：本文研究了水热提质对煤中氮和硫物种形态的影响。在200℃，250℃和300℃下对三种典型的褐煤进行了水热改性。发现水热改性降低了煤的水分含量，因此提高了发热量。利用X射线光电子能谱（XPS）分析了水热改性前后煤样品中氮和硫的形态。通过使用XPSPEAK points-peak软件进行XPS峰拟合分析。结果表明，水热处理破坏了煤的微观结构并改变了氮和硫的官能团。在水热升级后，原先被检测为吡咯峰（N-5）的氮转化为吡啶（N-6）或季氮（N-Q）物种。与多环芳烃缔合的季氮被转化为N-6，而煤边缘的N-Q分子则被转化为氮氧化物（N-X）。亚砜，砜和硫化物转化为噻吩；或者，硫化物转化为黄铁矿。这些变化可能导致SO2排放量减少。此外，可能存在亚砜和砜向磺酸盐的转化。在水热过程中，有机硫在一定程度上转化为无机硫。 （C）2015年由Elsevier Ltd.出版

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  • 来源
    《Fuel》 |2016年第15期|254-261|共8页
  • 作者

    Wang Zhihua; Li Qian; Lin Zhenmin; Whiddon Ronald; Qiu Kunzan; Kuang Min; Cen Kefa;

  • 作者单位

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Jiangsu Power Design Inst Co Ltd, China Energy Engn Grp, Nanjing 211102, Jiangsu, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, 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

    Hydrothermal modification; Low quality coals; Sulphur; Nitrogen; XPS;

    机译：水热改性劣质煤硫氮XPS;

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