Mean Heat Transfer Coefficient around a Horizontal Single Pipe in a Fast Circulating Fluidized Bed.

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  • Takashima Shiro
    Department of Mechanical Systems Engineering, Muroran Institute of Technology
  • Honda Yasuhisa
    Department of Mechanical Systems Engineering, Muroran Institute of Technology EBARA Corporation
  • Katayama Jiro
    Department of Mechanical Systems Engineering, Muroran Institute of Technology
  • Obata Eiji
    Department of Mechanical Systems Engineering, Muroran Institute of Technology
  • Takahashi Hiroshi
    Department of Mechanical Systems Engineering, Muroran Institute of Technology

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  • 高速循環流動層内の単一水平円管周りの平均熱伝達率
  • コウソク ジュンカン リュウドウソウナイ ノ タンイツ スイヘイ エンカン マ

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Abstract

Mean heat transfer coefficient hs around a single, horizontal pipe settled in a fast circulating fluidized bed was measured under various fluidizing condition. The heat transfer coefficient could be correlated well with the solid fraction in gas-solid mixture flow, being a function of solid circulating rate, gas velocity and riser position. The value of hs increased as the solid circulating rate became high. However, it was found that there was a critical solid fraction, ranged from 0.01 to 0.02, over which the increasing ratio dropped to a smaller one. This phenomenon was considered to be due to a characteristic change of the particle behavior around pipe.

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