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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Effect of transverse rib on heat transfer between circulating fluidized bed and membrane fins of water wall membrane tubes
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Effect of transverse rib on heat transfer between circulating fluidized bed and membrane fins of water wall membrane tubes

机译：横向肋对水壁膜管循环流化床和膜翅片的热传递的影响

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摘要

Overall heat transfer between circulating fluidized beds (CFB) and the ribbed membrane fins of a water wall tube was investigated experimentally in a cold model circulating fluidized bed riser. The riser had a cross sectional area of 0.1 x 0.2 m(2) and the height from the distributor plate to the riser exit was 3.9 m. Three isosceles triangular cross section prisms having a height to base width ratio (e/B) of 0.54 corresponding to the height to riser diameter ratios (e/D) of 0.019, 0.038 and 0.06, respectively were used as ribs. The ribs were installed transversely on the fins with three rib spacings (S) of 0.4 m, 0.5 mand 0.6 m. Local sand having an average diameter of 315 pm was used as the bed material. It was found that the heat transfer coefficients and the cluster solid fractions of the ribbed membrane fins were higher than those of the membrane fin, and varied with the rib spacing and the rib height to diameter ratio in the same manner. In addition, cluster contact time of the ribbed membrane fins was shorter than that for the membrane fin without ribs. (C) 2018 Elsevier B.V. All rights reserved.
机译：实验研究了循环流化床（CFB）与水壁管的肋膜鳍片之间的总传热和水壁管的肋状膜翅片中的冷模循环流化床提升管。提升管的横截面积为0.1×0.2米（2），并且从分配器板到提升管出口的高度为3.9米。三个等腰三角形横截面棱镜具有0.54的高度至基部宽度比（E / B），对应于0.019,0.038和0.06的高度，分别为0.019,0.038和0.06的高度分别用作肋骨。肋骨横向安装在具有0.4m的三个肋条间距的翅片上，0.5mend0.6μm。使用平均直径315μm的局部沙子作为床材料。结果发现，肋膜翅片的传热系数和簇固体馏分高于膜翅片的簇，并且以相同的方式与肋间距和肋高度变化至直径比。此外，肋膜鳍片的簇接触时间短于没有肋骨的膜鳍片的短。 （c）2018 Elsevier B.v.保留所有权利。

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