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Measurement of atomic sodium release during pyrolysis and combustion of sodium-enriched Zhundong coal pellet

机译：富钠准东煤球热解燃烧过程中原子钠释放量的测定

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摘要

Temporally resolved measurements of surface temperature, pellet diameter and proximal sodium concentration field are presented for the combustion of a high sodium coal (Zhundong) pellet. Non-resonant Planar laser-induced fluorescence (PLIF) was used to image the atomic sodium distribution around the coal pellet. The release profile of atomic sodium demonstrates three phases of combustion: (I) the de volatilization stage, (II) the char burnout stage, and (III) the ash reaction stage. Highest peak sodium concentration occurred in the char burnout stage, while the ash stage had the longest duration. The radial and axial sodium concentration decay during different phases of combustion was analyzed. During char burnout and ash stages, the maximum concentration of atomic sodium was near the pellet. In the devolatilization stage, burning of volatile-gases creates a high temperature region away from the surface of the coal pellet, which enhances the decomposition of sodium compounds in this region. Axial decay of atomic sodium concentration was governed by chemical reactions during all combustion stages. Calculation of atomic sodium flux (Na*(flux),) indicate that the smaller pellet releases atomic sodium more strongly in the devolatilization and char burnout stages than larger pellet. The mechanism of sodium release was inferred from the time derivatives of Na*(flux),,, pellet-surface temperature (T) and pellet diameter (d). During the devolatilization stage, only Na*(flux) and T show variations, indicating that atomic sodium release is due to pyrolysis of the coal pellet. In the char burnout stage, time derivatives of the three parameters obey a common trend, indicating that the sodium release is associated with the burning of organic components in the pellet. In the ash reaction stage, T and d remain constant, indicating that the release of atomic sodium may be attributed to slow processes in the ash, likely vaporization of sodium from crystalline solids. A two-steps sodium release kinetics has been developed in this study and the simulation results agree well with measurements at three burning stages of coal pellet. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：提出了用于高钠煤（准东）颗粒燃烧的表面温度，颗粒直径和近端钠浓度场的临时解析测量结果。使用非共振平面激光诱导荧光（PLIF）成像煤球周围的原子钠分布。原子钠的释放曲线表明燃烧分为三个阶段：（I）脱挥发分阶段，（II）炭烧尽阶段，和（III）灰分反应阶段。最高的钠峰值浓度出现在炭烧尽阶段，而灰分阶段持续时间最长。分析了燃烧不同阶段的径向和轴向钠浓度衰减。在烧焦和灰化阶段，原子钠的最大浓度接近颗粒。在脱挥发分阶段，挥发性气体的燃烧会在远离煤球表面的地方形成一个高温区域，这会加剧该区域中钠化合物的分解。在所有燃烧阶段，原子钠浓度的轴向衰减受化学反应控制。原子钠通量（Na *（flux），）的计算表明，较小的颗粒在脱挥发分和炭烧尽阶段比较大的颗粒更强地释放原子钠。从Na *（通量）的时间导数，丸粒表面温度（T）和丸粒直径（d）推断出钠释放的机理。在脱挥发分阶段，只有Na *（通量）和T显示出变化，表明原子钠的释放是由于煤球的热解所致。在炭烧尽阶段，三个参数的时间导数遵循共同趋势，这表明钠释放与颗粒中有机成分的燃烧有关。在灰分反应阶段，T和d保持恒定，表明原子钠的释放可能归因于灰分中的缓慢过程，可能是钠从结晶固体中蒸发。在这项研究中开发了一个两步的钠释放动力学，模拟结果与煤球三个燃烧阶段的测量结果非常吻合。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2017年第2期|429-438|共10页
  • 作者

    Wang Zhihua; Liu Yingzu; Whiddon Ronald; Wan Kaidi; He Yong; Xia Jun; Cen Kefa;

  • 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|Brunel Univ London, Dept Mech Aerosp & Civil Engn, Uxbridge UB8 3PH, Middx, England|Brunel Univ London, Inst Energy Futures, Uxbridge UB8 3PH, Middx, England;

    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|Brunel Univ London, Dept Mech Aerosp & Civil Engn, Uxbridge UB8 3PH, Middx, England|Brunel Univ London, Inst Energy Futures, Uxbridge UB8 3PH, Middx, England;

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

    Brunel Univ London, Dept Mech Aerosp & Civil Engn, Uxbridge UB8 3PH, Middx, England|Brunel Univ London, Inst Energy Futures, Uxbridge UB8 3PH, Middx, England;

  • 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

    Planar laser-induced fluorescence; Atomic sodium; Sodium release mechanism; Zhundong coal;

    机译：平面激光诱导荧光原子钠钠释放机理准东煤;

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