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The transition of heterogeneous-homogeneous ignitions of dispersed coal particle streams

机译：分散煤颗粒流的异质均匀点火的过渡

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摘要

This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200 K to 1800 K and oxygen mole fractions in the range of 10-30%. The dispersed coal particles of 65-74 μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero-homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction.
机译：这项工作正在评估对分散煤颗粒流的集体着火行为的研究，其中环境温度为1200 K至1800 K，氧气摩尔分数为10-30％。将65-74μm的分散煤颗粒通过新型解团块进料器注入光学Hencken平板火焰燃烧器中。考虑了三种不同等级的煤粉，呼伦贝尔褐煤，高灰分烟煤和低灰分烟煤。建立归一化的可见光信号强度，消除背景噪声，以表征煤颗粒流的点火延迟。首先，观察到由于环境温度从异质点火到异质点火的普遍过渡。纯均质点火很少发生，高挥发性煤在高温低氧条件下除外。通过比较热解和加热过程之间的时间尺度，讨论了挥发演变和非均相表面反应的竞争。然后，研究了环境温度，氧气摩尔分数和煤级对特征点火延迟的影响。最后，开发出过渡模式，该过渡模式不仅可以很好地解释所观察到的点火过渡现象，而且可以近似地预测异质点火时间随氧气含量的变化。

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  • 来源
    《Combustion and Flame》 |2014年第9期|2458-2468|共11页
  • 作者

    Ye Yuan; Shuiqing Li; Gengda Li; Ning Wu; Qiang Yao;

  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, 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

    Pulverized coal combustion; Ignition mode; Ignition delay; Pyrolysis; Hencken burner;

    机译：煤粉燃烧;点火模式点火延迟;热解;亨肯燃烧器;

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