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Structure characteristics and gasification activity of residual carbon from entrained-flow coal gasification slag

机译：气流床煤气化炉渣中残余碳的结构特征和气化活性

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摘要

The structure characteristics and gasification activity of residual carbon from entrained-flow coal gasification slag were mainly investigated using a pore structure analyzer, a scanning electron microscopy, a Raman spectroscopy and a thermo-gravimetric analyzer. Simultaneously, a kind of residual carbon from coal chars was used for a reference. Results showed that the residual carbon which was usually considered as "the unburnt carbon" in gasification slags, was potentially originated from volatile matters (especially those with macromolecular structures) of the original coal pyrolysis, partly-gasified carbons and/or unreacted pyrolytic carbons. Compared to the residual carbon in coal chars, that in gasification slags had a higher pore surface area, a larger average pore size, a more ordered carbon crystalline structure and less total active sites, whereas that in both coarse and fine slags presented a distinctly higher gasification activity, mainly ascribed to its quite more abundant porosity. Compared to the residual carbon in the fine slag, that in the coarse slag had a lower pore surface area, a slightly more disordered carbon crystalline structure and more total active sites, but that in the coarse slag presented a higher gasification activity, especially after the carbon conversion of around 0.5. This was probably due to more total active sites in the residual carbon of the coarse slag, especially its more active sites with mixed sp~2-sp~3 bond form. Besides, it also could be inferred that the activity of active sites with sp~2 bond form was superior to that with mixed sp~2-sp~3 bond form.
机译：夹带气流煤气化炉渣中残留碳的结构特征和气化活性主要使用孔结构分析仪，扫描电子显微镜，拉曼光谱和热重分析仪进行研究。同时，以煤焦中的一种残留碳为参考。结果表明，通常被认为是气化炉渣中“未燃烧的碳”的残留碳可能源自原始煤热解过程中的挥发性物质（尤其是具有大分子结构的物质），部分气化的碳和/或未反应的热解碳。与煤焦中的残留碳相比，气化炉渣中的残炭具有更高的孔表面积，更大的平均孔径，更规则的碳晶体结构和更少的总活性中心，而粗渣和细渣中的残渣碳均明显更高。气化活性，主要归因于其相当丰富的孔隙度。与细渣中的残留碳相比，粗渣中的碳具有较低的孔表面积，无序的碳晶体结构和更多的总活性位点，而粗渣中的碳具有更高的气化活性，尤其是经过碳转化率约为0.5。这可能是由于粗渣残留碳中的总活性位点更多，尤其是其具有混合的sp〜2-sp〜3键形式的活性位点。此外，还可以推断出sp〜2键形式的活性位点的活性优于sp〜2-sp〜3键混合形式的活性位。

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  • 来源
    《Fuel》 |2014年第4期|67-75|共9页
  • 作者

    Shiyong Wu; Sheng Huang; Liyuan Ji; Youqing Wu; Jinsheng Gao;

  • 作者单位

    Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;

    Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;

    Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China;

    Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;

    Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, 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

    Entrained-flow coal gasification; Gasification slag; Residual carbon; Structure characteristics; Gasification activity;

    机译：气流床煤气化;气化炉渣;残留碳结构特点;气化活动;

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