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Gasification characteristics of different rank coals at H2O and CO2 atmospheres

机译：H2O和CO2气氛下不同等级煤的气化特性

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摘要

Gasification characteristics of Shenhua bituminous (SH) and Baorixile lignite coal (BRXL) were investigated using both a thermogravimetric analyzer and tubular furnace. Coal samples were pyrolized in a tubular furnace at five different temperatures (800-1000 degrees C in 50 degrees increments), at two heating rates, 10 degrees C/min and 1000 degrees C/min. The resultant chars were gasified isothermally at (i) each of these five temperatures under a constant atmosphere (40% H2O(g) + 60% CO2) and (ii) at 1000 degrees C while varying the atmosphere from pure H2O(g) to pure CO2 by increasing the CO2 component stepwise in 20 vol.% increments. Carbon conversion, reactivity index, and average specific gasification rate were calculated and fit to a mixed reaction model. It was found that both the gasification temperature and atmosphere composition greatly impacted gasification characteristics, and the temperature effect was more pronounced in a heterogeneous atmosphere. The char produced with a high heating rate pyrolysis process promoted gasification reactivity likely a result of the more open pore structure. The gasification reactivity was lowest under a pure CO2 gasification atmosphere and increased continuously with the H2O partial pressure. SH and BRXL char samples achieved peak gasification reactivity under atmospheres with 60% and 80% H2O(g), respectively. Algo, a synergistic effect was observed for heterogeneous CO2/H2O gasification atmosphere and not all the gasification reactions obeyed a first-order reaction model. The results of this work indicate that there is an optimal gasification atmosphere and temperature combination, specific to the coal sample, for efficiently converting char to gasification products. (C) 2016 Elsevier B.V. All rights reserved.
机译：利用热重分析仪和管式炉研究了神华烟煤（SH）和宝力希勒褐煤（BRXL）的气化特性。将煤样品在五个不同温度（800-1000摄氏度，以50摄氏度的增量）下在管式炉中以10摄氏度/分钟和1000摄氏度/分钟的两种加热速率热解。在恒定气氛下（40％H2O（g）+ 60％CO2）在（i）这五个温度中的每一个下等温气化所得的焦炭，在（1000）摄氏度下将气氛从纯H2O（g）改变为（ii）等温气化。通过以20 vol。％的增量逐步增加CO2组分来获得纯CO2。计算碳转化率，反应性指数和平均比气化率，并将其拟合到混合反应模型中。发现气化温度和气氛组成都极大地影响了气化特性，并且在非均质气氛中温度效应更加明显。高加热速率热解过程产生的焦炭可能提高了气化反应性，这可能是孔结构更开放的结果。在纯CO2气化气氛下，气化反应性最低，并且随着H2O分压而连续增加。 SH和BRXL炭样品分别在60％和80％H2O（g）的气氛下达到了峰值气化反应性。同样，对于非均质CO2 / H2O气化气氛观察到协同效应，并且并非所有的气化反应都遵循一阶反应模型。这项工作的结果表明，存在针对煤样品的最佳气化气氛和温度组合，可以有效地将焦炭转化为气化产物。 （C）2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Analytical & Applied Pyrolysis》 |2016年第11期|76-83|共8页
  • 作者

    Wang Zhi-Hua; Zhang Kang; Li Yan; He Yong; Kuang Min; Li Qian; Cen Ke-Fa;

  • 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;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China|Shenhua Guohua Beijing Elect Power Res Inst Co Lt, Beijing 100025, Peoples R China;

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

    Ningbo Univ, Fac Maritime & Transportat, Ningbo 315211, 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);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gasification characteristics; Coal rank; Mixed reaction model; Synergistic effect;

    机译：气化特性煤级混合反应模型协同效应;

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