Experimental investigations of a pseudo-2D spout fluidized bed with draft plates
Experimental investigations of a pseudo-2D spout fluidized bed with draft plates
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DOI：
10.1016/j.ces.2013.08.046
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发表时间：
2013-10-11
影响因子：
4.7
通讯作者：
Kuipers, J. A. M.
中科院分区：
文献类型：
--
作者：
Sutkar, Vinayak S.;van Hunsel, Tom J. K.;Kuipers, J. A. M.
喷动流态化床常被证明在气固接触操作中很有前景，这些操作包括改变颗粒大小的化学反应。然而，在操作过程中可能会出现困难，如不稳定的喷口，形成死区，在调整最大可喷高度和停留时间方面灵活性有限。这可以通过插入导流管或导流板来改善。本文通过改变背景流速0~1.75m/S，增大背景流速0.25m/S，改变喷动速度10~50m/S，增大5m/S，研究了带导流板的准二维喷动床的流体力学特性。此外，采用粒子图像测速仪(PIV)和数字图像分析(DIA)相结合的方法测定了两种工况下的颗粒平均体积通量，考察了雾化高度(0.03~0.05m)、静态床层长宽比(1~1.5)和颗粒性质(玻璃和γ-氧化铝颗粒)对流体动力学的影响。(C)2013爱思唯尔有限公司。保留所有权利
Spout fluidized beds often prove promising for gas-solid contacting operations involving chemical reactions with changing particle size. However, difficulties may arise during operation, such as unstable spouting, dead zones formation and limited flexibility in adjustment of maximum spoutable height and residence time This can be improved by inserting draft tubes or plates. In this work, the hydrodynamics of a pseudo-2D spout fluidized bed with draft plates was studied by changing the background velocity from 0 to 1.75 m/s with increments of 0.25 m/s and the spout velocity from 10 to 50 m/s with increments of 5 m/s. The distinct flow regimes were identified by capturing high-speed images and Fast Fourier transformation (FFT) of measured pressure signals. In addition, the effects of the entrainment height (in the range of 0.03-0.05 m), static bed aspect ratio (in the range of 1-1.5) and particle properties (for glass and gamma-aluminum oxide particles) on the hydrodynamics were investigated by determining the time-averaged particle volumetric flux by combined particle image velocimetry (PIV) and digital image analysis (DIA) for two regimes namely, spouting-with-aeration (IV) and fluidized bed-spouting-with-aeration (dispersed spout) (VIII). (C) 2013 Elsevier Ltd. All rights reserved