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升温速率对胜利褐煤热解过程中N迁移转化的影响

张书,  白艳萍,  米亮,  郑盼盼,  陈绪军,  许德平,  王永刚

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文章导航 > 燃料化学学报（中英文）  > 2013 >  41(10): 1153-1159
张书, 白艳萍, 米亮, 郑盼盼, 陈绪军, 许德平, 王永刚. 升温速率对胜利褐煤热解过程中N迁移转化的影响[J]. 燃料化学学报（中英文）, 2013, 41(10): 1153-1159.
引用本文: 张书, 白艳萍, 米亮, 郑盼盼, 陈绪军, 许德平, 王永刚. 升温速率对胜利褐煤热解过程中N迁移转化的影响[J]. 燃料化学学报（中英文）, 2013, 41(10): 1153-1159.
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ZHANG Shu, BAI Yan-ping, MI Liang, ZHENG Pan-pan, CHEN Xu-jun, XU De-ping, WANG Yong-gang. Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, 2013, 41(10): 1153-1159.
Citation: ZHANG Shu, BAI Yan-ping, MI Liang, ZHENG Pan-pan, CHEN Xu-jun, XU De-ping, WANG Yong-gang. Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, 2013, 41(10): 1153-1159.
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升温速率对胜利褐煤热解过程中N迁移转化的影响

  • 1.

    中国矿业大学(北京) 化学与环境工程学院, 北京 100083;

  • 2.

    华东理工大学 煤气化及能源化工教育部重点实验室, 上海 200237

基金项目: 国家科技支撑计划 (2012BAA04B02)。
详细信息
    通讯作者:

    王永刚,Tel:010-62339882,E-mail:wyg1960@126.com;张书,Tel:010-62331048,E-mail:zhangshuwo@hotmail.com。

  • 中图分类号: TQ541

Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal

  • 1.

    School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;

  • 2.

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

    摘要
  • 摘要: 在固定床/流化床管式石英反应器中进行了胜利褐煤的快速热解和慢速热解实验,考察了升温速率对N迁移转化及对半焦内部N化学形态变化的影响。研究结果表明,快速升温热解气相N(NH3和HCN)生成量明显高于慢速热解时的生成量,且随着温度的升高,两者差值均逐渐增大。在多数情况下,NH3或HCN的产率在973 K左右并不随温度的升高而增加,这与高温下的半焦热缩聚反应以及挥发分的二次反应有关。快速热解条件下,半焦N的释放速率要快于半焦炭本身失重速率。X射线光电子能谱(XPS)分析认为,热解使得吡咯型N(N-5)部分转化为吡啶型N(N-6)和季氮型N(N-Q),快速热解有利于生成N-6,而慢速热解下半焦中N-Q含量较高。
    Abstract: The effects of heating rate on migration, transformation and occurring forms of nitrogen during pyrolysis of Shengli brown coals were studied in a fixed-bed/fluidised-bed quartz reactor. The results indicate that the yields of NH3 and HCN from the fast pyrolysis were much higher than those from the slow pyrolysis. The difference in the yields of NH3 and HCN between the fast and slow heating rates increases with the increasing pyrolysis temperature. The maximum productions of NH3 and HCN mostly occur at 973K, which is attributed to the enhanced condensation and secondary reactions with the increasing pyrolysis temperature. The release rate of char-N is faster than the weight loss rate of char itself at fast heating rate. The results from X-ray photoelectron spectroscopy (XPS) analysis imply that the pyrolysis process has facilitated the transformation of pyrrolic (N-5) to quaternary type nitrogen (N-Q) and pyridinic (N-6). It seems that the fast heating rate favors the formation of N-6 while the content of N-Q in char is relatively high at the slow heating rate.
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  • 收稿日期:  2013-01-28
  • 修回日期:  2013-04-26
  • 刊出日期:  2013-10-30

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