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首页> 外文期刊>Journal of Heat Transfer >Influence of Index of Refraction and Particle Size Distribution on Radiative Heat Transfer in a Pulverized Coal Combustion Furnace
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Influence of Index of Refraction and Particle Size Distribution on Radiative Heat Transfer in a Pulverized Coal Combustion Furnace

机译：折射率和粒度分布对粉煤燃烧炉辐射换热的影响

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摘要

In this work, the influence of the radiative properties of coal and ash particles on radiative heat transfer in combustion environments is investigated. Emphasis is placed on the impact on the impact of the complex index of refraction and the particle size on particle absorption and scattering efficiencies. Different data of the complex index of refraction available in the literature are compared, and their influence on predictions of the radiative wall flux and radiative source term in conditions relevant for pulverized coal combustion is investigated. The heat transfer calculations are performed with detailed spectral models. Particle radiative properties are obtained from Mie theory, and a narrow band model is applied for the gas radiation. The results show that, for the calculation of particle efficiencies, particle size is a more important parameter than the complex index of refraction. The influence of reported differences in the complex index of refraction of coal particles on radiative heat transfer is small for particle sizes and conditions of interest for pulverized coal combustion. For ash, the influence of variations in the literature data on the complex index of refraction is larger, here, differences between 10% and 40% are seen in the radiative source term and radiative heat fluxes to the walls. It is also shown that approximating a particle size distribution with a surface area weighted mean diameter, D~(32) , for calculation of the particle efficiencies has a small influence on the radiative heat transfer.
机译：在这项工作中，研究了煤和灰烬的辐射特性对燃烧环境中辐射热传递的影响。重点放在对复折射率和颗粒大小对颗粒吸收和散射效率的影响上。比较了文献中可获得的不同折射率的不同数据，并研究了它们对与粉煤燃烧有关的条件下的辐射壁通量和辐射源项的预测的影响。传热计算是通过详细的光谱模型执行的。根据米氏理论获得了粒子的辐射特性，并将窄带模型应用于气体辐射。结果表明，对于颗粒效率的计算，粒径是比复折射率更重要的参数。对于粉煤燃烧的粒径和感兴趣的条件，所报道的煤颗粒的复数折射率差异对辐射传热的影响很小。对于灰烬，文献数据的变化对复数折射率的影响更大，在这里，在辐射源项和到墙壁的辐射热通量中可以看到10％和40％之间的差异。还显示出，用表面积加权平均直径D〜（32）近似粒度分布以计算颗粒效率对辐射传热的影响很小。

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  • 来源
    《Journal of Heat Transfer》 |2017年第4期|042702.1-042702.8|共8页
  • 作者

    Robert Johansson; Tim Gronarz; Reinhold Kneer;

  • 作者单位

    Department ot Energy and Environment, Chalmers University of Technology, Goeteborg 412 58, Sweden;

    Institute of Heat and Mass Transfer, WSA, RWTH Aachen University, Augustinerbach 6, Aachen 52056, Germany;

    Institute of Heat and Mass Transfer, WSA, RWTH Aachen University, Augustinerbach 6, Aachen 52056, 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
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