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Theoretical and experimental investigation on heating moving packed beds in a single tube with constant wall temperature

机译：具有恒定壁温加热移动覆盖床的理论与实验研究

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摘要

Moving packed beds based on solid particles are receiving increasing attention in high temperature applications for their stability and wide range of working temperatures. A heat transfer model is proposed to describe the heat transfer behavior of moving packed beds. The model incorporates the pseudo-continuum character of moving packed beds and the discrete nature of the solid particles by dividing the moving packed bed into bulk and near-wall regions. The bulk region was considered as a pseudo-continuum described by a convective thermal resistance. Inside the near-wall region, the discrete characteristics of the solid particles are taken into account while only heat transfer through the solid material and the interstitial gas was included. The thermal resistance of the near-wall region was considered as a contact thermal resistance in series with a convective thermal resistance. In this paper, the heat transfer of moving packed beds with two heated section lengths was tested for four kinds of flow rates. By comparing with experimental results, it's verified that the model can describe the heat transfer behavior of moving packed beds over a wide range of particle flow rates. From a parameter sensitivity analysis, it's found that increasing the particle flow rate has an opposite effect on the heat transfer rates. A higher particle flow rate will simultaneously increase the contact thermal resistance and reduce the convective thermal resistance. With the increase of the particle flow rate, the heat transfer rate starts to decline when the effect of the increasing contact thermal resistance grows beyond the effect of the improved convection. In addition, for longer residence time heat transfer processes, the convective thermal resistance is the primary influence factor. But for shorter residence time heat transfer processes, the contact thermal resistance becomes the main thermal resistance. The proposed model could be used in the design of industrial-scale moving packed bed heating devices.
机译：基于固体颗粒的移动床在高温应用中接受了较高的关注，以实现它们的稳定性和各种工作温度。提出了一种传热模型来描述移动包装床的传热行为。该模型通过将移动的填充床分成散装和近壁区域来包括移动填充床的伪连续性特性和固体颗粒的离散性质。将散装区域被认为是通过对流热阻描述的伪连续体。在近壁区域内，考虑固体颗粒的离散特性，同时仅包括通过固体材料和间质气体的热传递。近壁区域的热阻被认为是具有对流热阻串联的接触热阻。在本文中，测试了具有两个加热截面长度的移动填充床的传热，用于四种流速。通过与实验结果进行比较，验证了该模型可以描述在广泛的颗粒流速上移动填充床的传热行为。根据参数灵敏度分析，发现增加粒子流量对传热速率的影响相反。更高的颗粒流速将同时增加接触热阻并降低对流热阻。随着颗粒流速的增加，当接触热阻增加的效果远远超出改善对流的效果时，传热速率开始下降。另外，对于较长的停留时间传热过程，对流热阻是主要影响因素。但对于较短的停留时间传热过程，接触热阻成为主要的热阻。所提出的模型可用于工业规模移动包装床加热装置的设计。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121725.1-121725.16|共16页
  • 作者

    Yupu Yu; Fuliang Nie; Fengwu Bai; Zhifeng Wang;

  • 作者单位

    Key Laboratory of Solar Thermal Energy and Photovoltaic System. Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Institute of Etectrical Engineering Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China University of Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Beijing Engineering Research Center of Solar Thermal Power. NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China;

    Key Laboratory of Solar Thermal Energy and Photovoltaic System. Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Institute of Etectrical Engineering Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China University of Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Beijing Engineering Research Center of Solar Thermal Power. NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Coal Combustion. Huazhong University of Science and Technology Wuhan 430074 China;

    Key Laboratory of Solar Thermal Energy and Photovoltaic System. Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Institute of Etectrical Engineering Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China University of Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Beijing Engineering Research Center of Solar Thermal Power. NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China;

    Key Laboratory of Solar Thermal Energy and Photovoltaic System. Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Institute of Etectrical Engineering Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China University of Chinese Academy of Sciences NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 China Beijing Engineering Research Center of Solar Thermal Power. NO.6 Beiertiao Zhongguancun Haidian Disctrict Beijing 100190 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

    Moving packed beds; Pseudo-continuum; Near-wall region; Contact thermal resistance;

    机译：移动包装床;伪连续统一体;近墙区;接触热阻;

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