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X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals

机译：富惰化煤煤焦气化和燃烧的X射线衍射参数和反应速率模型

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摘要

An investigation was undertaken to determine the effect of carbon structural properties on the reactivity of chars derived from inertinite-rich coal. The structures of chars were characterized by X-ray diffraction and the reactivity evaluation with respect to gasification and combustion involving experimentation and reaction rate modeling was carried out. The effect of the aromaticity on the intrinsic reaction rates and associated activation energy for gasification and combustion of chars were determined based on chemical reaction rate controlled kinetics. Two sets of results were examined consisting of gasification with four char samples derived from different inertinite-rich coals prepared with a devolitalization temperature of 900 ℃ (Set 1) and three chars from the same parent coal also rich in inertinites prepared at different devolitalization temperatures, namely 550, 700 and 850 ℃ (Set 2). It was found that the aromaticity and fraction of crystalline carbon of the four chars prepared at the same temperature (Set 1) varied in the ranges 0.85-0.95 and 0.52-0.72 respectively and the chars prepared at different temperatures (Set 2) in the ranges 0.82-0.92 and 0.44-0.74 respectively. The structural properties of the chars within each set of results were also very different which required reaction rate modeling for the determination of intrinsic reactivities. The random pore model with chemical reaction controlling described the reaction kinetics accurately and it was found that the intrinsic reactivity of the char decreased with increasing aromaticity while the activation energies decreased (aromaticity ＜ 0.92) which indicated the effect of the variation of the distribution of aromatic/aliphatic structures on the intrinsic reaction rate. It is proposed that the aromaticity of chars be used as a predictive index for char reactivity under chemical reaction controlled conditions.
机译：进行了一项研究，以确定碳结构性质对富含惰质煤的焦炭反应性的影响。通过X射线衍射表征炭的结构，并进行了涉及实验和反应速率建模的关于气化和燃烧的反应性评估。基于化学反应速率控制的动力学，确定了芳族化合物对固有反应速率的影响以及用于焦炭气化和燃烧的相关活化能。检验了两组结果，包括用四个煤焦样品进行气化，这些炭样品分别来自以900℃的脱挥发分温度制备的不同富含惰性的煤（第1组），以及来自同一母体煤的三个炭，这些煤也富含在不同脱挥发分温度下制备的惰性的，即550、700和850℃（第2组）。发现在相同温度（组1）下制备的四种炭的芳族度和结晶碳的分数分别在0.85-0.95和0.52-0.72的范围内变化，并且在不同温度下（组2）制备的炭在该范围内。分别为0.82-0.92和0.44-0.74。每组结果中炭的结构性质也非常不同，这就要求对反应速率进行建模以测定固有反应性。化学反应控制的随机孔模型准确地描述了反应动力学，发现炭的内在反应性随芳族度的增加而降低，而活化能降低（芳族度＜0.92），这表明了芳烃分布变化的影响。 /脂族结构对本征反应速率的影响。建议在化学反应控制的条件下，将炭的芳香性用作炭反应性的预测指标。

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  • 来源
    《Fuel》 |2013年第7期|148-156|共9页
  • 作者

    Raymond C. Everson; Gregory N. Okolo; Hein W.J.P. Neomagus; Jaen-Mari dos Santos;

  • 作者单位

    Coal Research Croup, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private BagX6001, Potchefstroom,2520, South Africa;

    Coal Research Croup, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private BagX6001, Potchefstroom,2520, South Africa;

    Coal Research Croup, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private BagX6001, Potchefstroom,2520, South Africa;

    Coal Research Croup, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private BagX6001, Potchefstroom,2520, South Africa;

  • 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

    Inertinite-rich coals; Devolitalization; Gasification and combustion reactivity; X-ray diffraction properties; Intrinsic reaction rates;

    机译：富含惰性的煤;脱脂;气化和燃烧反应性;X射线衍射特性;本征反应速率;

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