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Investigation of mechanisms in plasma-assisted ignition of dispersed coal particle streams

机译：煤粉流等离子体辅助点火机理的研究

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摘要

The plasma-assisted ignition enhancement of pulverized lignite particles is intensively studied in a laminar, upward Hencken flat-flame burner. By applying a pair of pin-to-pin electrodes with a high voltage DC power supply, the apparent reductions of ignition delay time, about 0.8-3.5 ms, are observed for all three ambient temperatures, 1200 K, 1500 K and 1800 K, across which the ignition mode transits from heterogeneous ignition (HI) to hetero-homogeneous combined one. Concentrated on 1200 K ambience where HI mode prevails, the plasmas-induced reduction of ignition delay time as a function of the applied voltage (0-20 kV) is explored, in which the chemical effect is found to play a key role in cases with voltage less than 3 kV. Then, under the conditions of different oxygen mole fractions, the discharge mechanisms and the reductions of ignition delay time are further examined to distinguish the chemical and thermal effects on the ignition enhancement. Finally, the gas temperature rise, both measured and predicted at a point located 6 mm above the electrodes, verifies the thermal effect. This paper provides a preliminary understanding of plasma-assisted ignition mechanisms on dispersed coal particles that may be applied in practical combustion system. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在层状向上的亨肯平焰燃烧器中深入研究了粉煤褐煤颗粒的等离子体辅助点火增强。通过使用一对具有高压直流电源的引脚对引脚电极，在所有三种环境温度（1200 K，1500 K和1800 K）下，观察到点火延迟时间明显减少，约为0.8-3.5 ms，点火模式从此模式从异质点火（HI）过渡到异质组合点火。集中在HI模式占优势的1200 K环境中，探索了等离子体引起的点火延迟时间的减少与所施加电压（0-20 kV）的关系，在这种情况下，发现化学作用在以下情况下起关键作用电压小于3 kV。然后，在不同氧摩尔分数的条件下，进一步研究了放电机理和点火延迟时间的减少，以区分化学和热效应对点火增强的影响。最后，在电极上方6 mm处测量和预测的气体温度上升，验证了热效应。本文提供了对可能在实际燃烧系统中应用的煤分散体上的等离子体辅助点火机理的初步理解。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2016年第15期|518-524|共7页
  • 作者

    Zhao Fengxuan; Li Shuiqing; Ren Yihua; Yao Qiang; Yuan Ye;

  • 作者单位

    Tsinghua Univ, Dept Thermal Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Thermal Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Thermal Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Thermal Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Thermal Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China|Huaneng Clean Energy Res Inst, CFB Dept, Beijing 102209, Peoples R 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

    Plasma-assisted ignition; Pulverized coal combustion; Pin-to-pin electrodes; Hencken burner;

    机译：等离子点火;粉煤燃烧;针式电极;Hencken燃烧器;

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