A. Chianese , C. Frances , F. Di Berardino , L. Bruno
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引用次数: 9
摘要
实验研究了一尺寸过硼酸钠结晶流化床在饱和水溶液中的行为。晶粒尺寸为300 ~ 700 μm，形状不规则，表面呈枝晶状。该工作的主要目的是在考虑颗粒形状与球形偏差的情况下预测流化特性(速度和床层空隙)。在2-5 cm s−1范围内的终端速度，已经通过克利夫特相关，通过假设一个粒子是一个等体积的球体，得到了精确的估计。用球度因子表征晶体尺寸，采用Riba方程预测最小流化速度，得到的膨胀指数n比球形颗粒的Richardson-Zaki关系式估计的膨胀指数n高20% ~ 25%。所采用的计算方法允许估算膨胀床的孔隙率，平均误差为1.58%。
On the behaviour of a liquid fluidized bed of monosized sodium perborate crystals
The behaviour of fluidized beds of monosized sodium perborate crystals in saturated aqueous solutions has been investigated experimentally. The crystals, 300–700 μm in size, are irregular in shape and have a dendritic surface.
The main aim of the work was to predict the fluidization characteristics (velocities and bed voidages) taking into account the deviation of particle shape from spherical. The terminal velocity, in the range 2–5 cm s−1, has been accurately estimated by means of Clift's correlations, by assuming as a particle a sphere of equal volume. The values of the expansion index n, which are 20%–25% higher than those estimated by the Richardson-Zaki relationship for spherical particles, have been satisfactorily predicted by characterizing crystal dimensions by means of the sphericity factor and by adopting Riba's equation to predict the minimum fluidization velocity.
The calculation procedure adopted permits estimation of expansion bed voidages with an average error of 1.58%.
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