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Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal

机译：气化剂对维多利亚褐煤气化过程中炭结构演变的影响

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摘要

Steam plays a vital role in the gasification process. This study aims to investigate the changes in char structure and reactivity during the gasification of Victorian brown coal. A Loy Yang brown coal sample was gasified at 800 ℃ in a novel fluidised-bed/fixed-bed reactor in three different gasification atmospheres: 15% H_2O balanced with argon, 4000 ppm O_2 balanced with CO_2 and 4000 ppm O_2 + 15% H_2O balanced with CO_2. The intrinsic reactivities of chars with air were measured with a thermogravimetric analyser (TGA) at low temperatures (380 or 400 ℃). The char structural features were characterised using FT-Raman spectroscopy followed by spectral deconvolution. Our results indicate that steam, when it is present in the gasifying atmosphere, has a drastic effect on char structure and the subsequent reactivity of char with air at low temperatures. The presence of steam during the gasification at 800 ℃ also impacts on the volatilisation of Mg and Ca by altering the char structure. Our data provide evidence that the char-H_2O gasification follows a different reaction pathway from the char-CO_2 gasification, at least for the gasification of Victorian brown coal under the current experimental conditions.
机译：蒸汽在气化过程中起着至关重要的作用。本研究旨在调查维多利亚褐煤气化过程中炭结构和反应性的变化。将Loy Yang褐煤样品在新型流化床/固定床反应器中在三种不同的气化气氛下于800℃气化：15％H_2O与氩气平衡，4000 ppm O_2与CO_2平衡以及4000 ppm O_2 + 15％H_2O平衡与CO_2。在低温（380或400℃）下，用热重分析仪（TGA）测量了炭在空气中的固有反应性。使用FT-拉曼光谱法，然后进行光谱去卷积，表征炭结构特征。我们的结果表明，当蒸汽存在于气化气氛中时，它对炭的结构以及随后的炭在低温下与空气的反应性具有极大的影响。 800℃气化过程中蒸汽的存在也会通过改变炭结构而影响镁和钙的挥发。我们的数据提供了证据，证明至少在当前的实验条件下，对于维多利亚褐煤的气化而言，char-H_2O的气化遵循与char-CO_2气化不同的反应途径。

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  • 来源
    《Fuel》 |2013年第1期|22-28|共7页
  • 作者

    Hui-Ling Tay; Shiro Kajitani; Shu Zhang; Chun-Zhu Li;

  • 作者单位

    Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia,Department of Chemical Engineering, P.O. Box 36, Monash University, VIC 3800, Australia;

    Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;

    Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;

    Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia,Department of Chemical Engineering, P.O. Box 36, Monash University, VIC 3800, Australia;

  • 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

    victorian brown coal; gasification; char structure; char reactivity;

    机译：维多利亚时代的褐煤;气化;字符结构炭反应性;

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