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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Rising and descending bubble size distributions in gas-liquid and gas-liquid-solid slurry bubble column reactor
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Rising and descending bubble size distributions in gas-liquid and gas-liquid-solid slurry bubble column reactor

机译：上升和下降气泡大小分布气液和gas-liquid-solid浆泡沫列反应堆

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摘要

Dual-tip conductivity probe is used to determine distributions of rising and descending bubble size in gas-liquid and gas-liquid-solid bubble column.The column is 100 mm in internal diameter and 1500 mm in height.The solid particles used are glass beads with average diameter of 17.82 mu m representing typical particle size for catalytic slurry reactors.Bubbles are categorized to two size classes,small bubbles with chord length(d_c)less than 10 mm and large bubbles with chord length greater than 10 mm.The effects of superficial gas velocity(1.0 cm/s<=U_g<=6.4 cm/s),solid holdup(0%<=epsilon_s<=30%)and radial location(r/R=0,0.4 and 0.7)on bubble size distributions are determined.A fundamental statistic test-chi~2-test is used to test whether the experimental rising and descending bubble size distributions follow the commonly used distributions.It is found that increasing U_g and epsilon_s can increase the size and quantity of large bubbles.The results indicate that most small rising bubble size distributions are well characterized by lognormal or gamma distributions at low solid holdup.The descending bubble size does not follow any often used distributions;the majority of them are less than 4 mm,and a few of large descending bubbles appear with the increasing of epsilon_s and U_g.Usually,the total bubble size distributions are not fit for the lognormal distributions except when the descending bubbles are few under the condition of U_g=1.0 cm/s and epsilon_s=0%.
机译：Dual-tip电导探针用于确定分布的上升和下降的泡沫在气液和gas-liquid-solid泡沫大小列。并在高度1500毫米。玻璃珠平均直径为17.82μm代表典型的粒子大小催化油浆的核反应堆。两个大小类,小泡沫与和弦长度(d_c)小于10毫米,大泡沫弦长度大于10 mm.The的影响表面气体速度(1.0厘米/ s < = U_g < = 6.4cm / s)、固体抢劫(0% < = epsilon_s < = 30%)和径向位置(r / r = 0, 0.4和0.7)在泡沫的大小分布确定。统计test-chi ~ 2的测试用于测试实验上升和下降的泡沫按照常用的尺寸分布分布。epsilon_s可以增加的大小和数量大的泡沫。小上升的气泡大小分布对数正态或伽玛分布的特征在低固体持枪抢劫。不遵循任何常用分布;大多数都小于4毫米,和一些的大降泡沫的出现增加epsilon_s U_g。气泡大小分布并不适合对数正态分布时除外下行泡沫很少的情况下U_g = 1.0厘米/秒和epsilon_s = 0%。

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