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Effect of density on physicochemical and thermal conversion characteristic of Naomaohu coal

机译：naomaohu煤炭物理化学和热转化特性的影响

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摘要

Three coal samples with different density (d 1.35, 1.35 d 1.40 and d 1.40 g cm(-3)) which were separated using ZnCl2 specific gravity liquid from Naomaohu (NMH) coal were investigated to understand the difference in their physicochemical and thermal properties. Fourier transform infrared spectrometry (FTIR), Raman, X-ray diffraction (XRD), solid-state C-13 Nuclear Magnetic Resonance (C-13 NMR) and scanning electron microscopy (SEM) methods were used to determine the physicochemical characteristics of the coal sample. In addition, a TG-FTIR analyzer was used to investigate the key thermal conversion characteristics and volatile emissions of the three coal samples. Typical volatile contents including CO2, CO, CH4, and Aromatic C=C were analyzed. Results showed that the density has great effect on functional groups and crystalline structure on coal sample. Four distinct peaks are showed in DTG curves, indicating that four reaction stages, namely, drying, desorption, pyrolysis, and polycondensation, were involved in the pyrolysis process of NMH coal. The TG/DTG curves of the three densities indicate that the low-density coal assumes the highest weight loss rate at the pyrolysis stage and the trend becomes weaker at the polycondensation stage. Two obvious emission peaks vividly showed that light gases such as CO2, CO, and CH4 can be separated into two stages at the pyrolysis and polycondensation stage.
机译：采用来自Naomaohu（NMH）煤的ZnCl2比重液分离的三种具有不同密度（D <1.35,1.35，1.35 <1.40和D> 1.40g CM（-3））的煤样品，以了解其物理化学的差异和热性质。傅里叶变换红外光谱法（FTIR），拉曼，X射线衍射（XRD），固态C-13核磁共振（C-13 NMR）和扫描电子显微镜（SEM）方法用于确定物理化学特性煤样。此外，使用TG-FTIR分析仪来研究三种煤样的关键热转换特性和挥发性排放。分析包括CO 2，CO，CH 4和芳族C = C的典型挥发性含量。结果表明，密度对煤样上的官能团和晶体结构具有很大的影响。在DTG曲线中显示出四个不同的峰，表明四种反应阶段，即干燥，解吸，热解和缩聚，参与NMH煤的热解过程。三密度的Tg / DTG曲线表明低密度煤假设热解阶段的最高减肥率，趋势在缩聚阶段变弱。两种明显的发射峰生动地显示，诸如CO 2，CO和CH4的光气体可以在热解和缩聚阶段分为两个阶段。

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  • 来源
    《Fuel》 |2021年第15期|119045.1-119045.8|共8页
  • 作者

    Chen Tianju; Dai Ruowei; Yellezuome Dominic; Zhang Ke; Zhao Ruidong; Liu Guangrui; Wu Jinhu;

  • 作者单位

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Key Lab Biofuels 189 Songling Rd Qingdao 266101 Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Key Lab Biofuels 189 Songling Rd Qingdao 266101 Peoples R China;

    Shanghai Jiao Tong Univ Sch Agr & Biol Biomass Energy Engn Res Ctr Shanghai 200240 Peoples R China;

    China Natl Tobacco Corp Zhengzhou Tobacco Res Inst Zhengzhou 450001 Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Key Lab Biofuels 189 Songling Rd Qingdao 266101 Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Key Lab Biofuels 189 Songling Rd Qingdao 266101 Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Key Lab Biofuels 189 Songling Rd Qingdao 266101 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

    Low-rank coal; Pyrolysis; TG-FTIR; Volatile species;

    机译：低级煤;热解;TG-FTIR;挥发物种;

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