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首页> 外文期刊>International Journal of Heat and Mass Transfer >Impact of bed motion on the wall-to-bed heat transfer for powders in a rotary kiln and effect of built-ins
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Impact of bed motion on the wall-to-bed heat transfer for powders in a rotary kiln and effect of built-ins

机译：床动作对焊接窑壁壁的热转印的影响及内置效果

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摘要

This study analyses experimentally the heat transfer from the wall to the particle bed in a rotating drum with and without addition of built-ins for improving the mixing of the powder. Two types of materials were employed, sand as a granular material (d_(p.mean) = 200 μm) and cement raw meal as a powdery material (d_(p.mean) = 15 μm). A rotating cylinder heated through the outer shell was operated in batch mode, with rotational speeds of 1, 2 and 3 rpm and fillings of 5 and 10 %. The sand achieved a rolling motion, which makes the measured heat transfer coefficient predictable with theoretical models. At the contrary, cement raw meal showed very little mixing in a cylinder without built-ins and the measured heat transfer coefficient was much lower than the model predictions. Using longitudinal strips along the wall caused the powder to collapse regularly, increasing its heat transfer by a factor of 2-3, up to the range of predictions from theoretical models. Thus, a motion comparable to the rolling motion can be established with such built-ins which only cause limited dust formation. Furthermore, the limitations of the measurement method with rotating thermocouples are pointed out which mostly stem from the thermocouple response time and convectional losses, which are increased once built-ins are employed.
机译：该研究通过实验分析从壁到旋转滚筒中的颗粒床的热传递，在旋转鼓中，不添加内置以改善粉末的混合。使用两种材料，作为颗粒状物质（D_（P.mean）=200μm）和水泥生餐作为粉末材料（D_（p.mean）=15μm）。通过外壳加热的旋转圆筒以批速模式操作，旋转速度为1,2和3 rpm，填充为5％和10％。沙子实现了一种轧制运动，这使得测量的传热系数可预测可预测理论模型。相反，水泥生餐显示在没有内在的圆柱体中的混合很少，并且测量的传热系数远低于模型预测。沿着墙壁的纵向条引起粉末定期坍塌，将热传递增加2-3倍，直至理论模型的预测范围。因此，可以建立与轧制运动相当的运动，这种内置仅包括导致有限的粉尘形成。此外，指出了具有旋转热电偶的测量方法的局限性，其中主要源于热电偶响应时间和对流损耗，这是在内置内置一旦采用内置的。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121473.1-121473.12|共12页
  • 作者

    Gkiokchan Moumin; Stefania Tescari; Christian Sattler;

  • 作者单位

    Institute of Future Fuels German Aerospace Center Under Hoehe 51347 Cologne Germany Solar Fuel Production Institute of Power Engineering Faculty of Mechanical Science and Engineering TU Dresden 01069 Dresden Germany;

    Institute of Future Fuels German Aerospace Center Under Hoehe 51347 Cologne Germany;

    Institute of Future Fuels German Aerospace Center Under Hoehe 51347 Cologne Germany Solar Fuel Production Institute of Power Engineering Faculty of Mechanical Science and Engineering TU Dresden 01069 Dresden 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

    Rotary kiln; Granular; Powder; Lifter; Rolling;

    机译：回转窑;粒状;粉末;升降机;滚动;

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