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Influence of operational parameters and material properties on the contact heat transfer in rotary kilns

机译：操作参数和材料性能对回转窑接触传热的影响

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摘要

The heat transfer by contact between the covered inner wall surface and the solid bed in a rotary kiln was experimentally investigated. An indirect heated batch rotary drum with a diameter of D = 600 mm and a length of L = 450 mm has been used. Inside the drum, a rotating and stationary measuring rod was installed, each assembled with 16 k-type thermocouples to measure the temperatures. Thus, the radial and circumferential temperature gradients within the solid bed were measured, and the contact heat transfer was determined from the heating of the bed. The effect on the contact heat transfer coefficient was estimated for the operational parameters of the drum, rotational speed (1, 3, 6 rpm) and filling degree (10%, 15%, 20%); the solid bed parameters, particle diameter (0.7,1.3,2.0 mm) and thermo physical properties (conductivity, heat capacity, density). As test material, quartz sand, glass beads and copper beads were used. The measured heat transfer coefficients were compared with theoretical calculations of four model approaches from the recent literature. A good agreement with just one of these model approaches could be achieved.
机译：实验研究了在回转窑中通过覆盖的内壁表面与固体床之间的接触进行的热传递。使用了直径D = 600毫米，长度L = 450毫米的间接加热间歇式转鼓。在转鼓内部安装了一个旋转的固定式测量杆，每个测量杆均装配有16 k型热电偶以测量温度。因此，测量了固体床内的径向和圆周温度梯度，并根据床的加热确定了接触传热。估计滚筒的运行参数，转速（1、3、6 rpm）和填充度（10％，15％，20％）对接触传热系数的影响；固体床参数，粒径（0.7、1.3、2.0毫米）和热物理性质（电导率，热容量，密度）。作为测试材料，使用石英砂，玻璃珠和铜珠。将测得的传热系数与最新文献中四种模型方法的理论计算进行了比较。仅使用这些模型方法之一就可以达成良好的协议。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第26期|p.7941-7948|共8页
  • 作者

    Fabian Herz; Iliyan Mitov; Eckehard Specht; Rayko Stanev;

  • 作者单位

    Otto von Guericke University Magdeburg, Institute of Fluid Dynamics and Thermodynamics, Universitaetsplatz 2, 39106 Magdeburg, Germany;

    University of Chemical Technology and Metallurgy - Sofia, 8 Kliment Ohridski blvd., 1756 Sofia, Bulgaria;

    Otto von Guericke University Magdeburg, Institute of Fluid Dynamics and Thermodynamics, Universitaetsplatz 2, 39106 Magdeburg, Germany;

    University of Chemical Technology and Metallurgy - Sofia, 8 Kliment Ohridski blvd., 1756 Sofia, Bulgaria;

  • 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; heat transfer; contact; solid bed; granular materials;

    机译：回转窑;传播热量;联系;坚固的床粒状材料;

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