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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 >The effect of rolling amplitude and period on particle distribution behavior in a rolling circulating fluidized bed
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The effect of rolling amplitude and period on particle distribution behavior in a rolling circulating fluidized bed

机译：轧制振幅和周期对轧制循环流化床中颗粒分布行为的影响

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摘要

The effect of rolling amplitude and rolling period on particle distribution behaviors in a rolling circulating fluidized bed (RCFB) has been quantitatively clarified by means of the electrical capacitance tomography (ECT) technique. A series of experiments with a cold mode RCFB were performed while the rolling amplitude and rolling period varied from Theta = 2.5 degrees to 10.0 degrees and T = 5.0 to 15.0 s, respectively. Based on the particle distribution images captured by the ECT sensor, three main characteristics of particle distribution behavior, namely the average particle volume fraction, the particle distribution stability and the particle distribution uniformity, were quantitatively estimated. As results, the particle distribution behavior in the RCFB was dominated by the shear effect, which was derived from the inertial forces and gravity in the radial direction of the riser. The positive influence of rolling amplitude on the shear effect caused augmentation of the particle volume fraction; however, particle distribution became unstable and heterogeneous. Meanwhile, although the characteristic fluctuation frequency of particle volume fraction was dominated by the rolling period, little effect of the rolling period on the particle distribution behaviors was observed due to its minimal influence on the shear effect. (C) 2016 Elsevier B.V. All rights reserved.
机译：借助静电层析成像（ECT）技术已定量阐明了轧制幅度和轧制周期对轧制循环流化床（RCFB）中颗粒分布行为的影响。进行了一系列冷模式RCFB实验，而轧制幅度和轧制周期分别从Theta = 2.5度至10.0度和T = 5.0至15.0 s变化。基于由ECT传感器捕获的颗粒分布图像，定量地估计了颗粒分布行为的三个主要特征，即平均颗粒体积分数，颗粒分布稳定性和颗粒分布均匀性。结果，RCFB中的颗粒分布行为受剪切效应支配，该剪切效应源自立管径向的惯性力和重力。滚动幅度对剪切效应的积极影响导致了颗粒体积分数的增加。然而，颗粒分布变得不稳定和不均匀。同时，尽管颗粒体积分数的特征波动频率由轧制周期决定，但是由于轧制周期对剪切效应的影响最小，因此观察到轧制周期对颗粒分布行为的影响很小。 （C）2016 Elsevier B.V.保留所有权利。

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