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首页> 外文期刊>International Journal of Heat and Mass Transfer >The shape development of spherical and non-spherical char particles in the flame zone of an entrained-flow gasifier - A numerical study
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The shape development of spherical and non-spherical char particles in the flame zone of an entrained-flow gasifier - A numerical study

机译：气流床气化炉火焰区球形和非球形炭颗粒的形貌发展-数值研究

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摘要

The shape of a particle affects its trajectory in an entrained-flow gasifier significantly. For that reason, the present work studies how the particle shape is changed during the conversion process. Several non-spherical particles are considered. The focus is on the conversion process in the flame zone, since that is where the highest gradients in temperature and concentration occur across the particle. A particle-resolved transient CFD model was applied together with a mesh motion algorithm, enabling a detailed analysis of the complex interphase phenomena between the flow field and the reactive particle. It is shown that the particle morphology changes significantly during the conversion process. The final shape depends on the initial particle shape and the reaction rate distribution across the particle, which is a function of the particle Reynolds number. Only in exceptional cases is the remaining particle spherical after leaving the flame zone. This fact must be taken into account if drag coefficients and Nusselt and Sherwood number correlations are applied in a CFD-based reactor model.
机译：在气流床气化炉中，颗粒的形状会显着影响其轨迹。因此，本工作研究在转化过程中颗粒形状如何变化。考虑了几个非球形粒子。重点是火焰区域中的转换过程，因为那是整个粒子上出现温度和浓度最高梯度的地方。粒子解析瞬态CFD模型与网格运动算法一起应用，可以对流场和反应粒子之间的复杂相间现象进行详细分析。结果表明，粒子的形貌在转化过程中发生了显着变化。最终形状取决于初始颗粒形状和整个颗粒的反应速率分布，这是颗粒雷诺数的函数。仅在特殊情况下，离开火焰区域的其余颗粒才是球形的。如果在基于CFD的反应堆模型中应用了阻力系数以及Nusselt和Sherwood数相关性，则必须考虑到这一事实。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119220.1-119220.11|共11页
  • 作者

  • 作者单位

    Chair of Energy Process Engineering and Thermal Waste Treatment. TV Bergakademie Freiberg. Fuchsmuehlenweg 9 09599 Freiberg. Germany School of Chemical Engineering Hanoi University of Science and Technology (HUST). No.1 Dai Co Viet Street Hanoi 10000 Vietnam;

    Chair of Energy Process Engineering and Thermal Waste Treatment. TV Bergakademie Freiberg. Fuchsmuehlenweg 9 09599 Freiberg. Germany;

    Institute of Clean Coal Technology East China University of Science and Technology Shanghai 200237 China;

    C1C Virtuhcon TU Bergakademie Freiberg Fuchsmuehlenweg 9 09599 Freiberg Germany;

  • 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

    Gasification; Combustion; Char conversion; Particle-Resolved CFD; Particle shape development; Non-spherical particles;

    机译：气化;燃烧;字符转换;颗粒分辨CFD;颗粒形状发展;非球形粒子;

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