LIQUSD PHASE MASS TRANSFER IN PACKED BED REACTOR WITH COCURRENT GAS-LIQUID DOWNFLOW
LIQUSD PHASE MASS TRANSFER IN PACKED BED REACTOR WITH COCURRENT GAS-LIQUID DOWNFLOW
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气液并流下流填充床反应器中的 LIQUSD 相传质
DOI：
10.1252/jcej.7.187
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
Yuji Sato
中科院分区：
文献类型：
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作者：
T. Hirose;Mikio Toda;Yuji Sato
本文测定了O_2-水和CO_2-NaOH两相并流体系在3种不同粒径（2.59- 12.2mm）玻璃球填充柱中的体积吸收系数（ka）lg、比界面面积（alg）和传质系数（klg）。观察到的（ka）lg值如此之高，以至于在常规气液接触器中几乎无法达到。这是由于分散在液体中的小气泡的大alg，其中alg经常超过填料的几何表面积。klg值在2 ~ 8×10 ~（-4）m/s之间，与通常系统中循环气泡的klg值相当。表观气速对（ka）lg和alg的影响远大于逆流填料塔，而液速的影响则大致相同。提出了一种新的表征微观流动强度的方法-单位体积液相能量损失E1，并将其用于传质性能的讨论和关联。发现气泡直径与E1 -2/5成正比。
Volumetric absorption coefficient (ka)lg, specific interfacial area alg and mass transfer coefficient klg were measured for two-phase cocurrent flow of O2-water and CO2-NaOH systems in a column packed with glass spheres of 3 different sizes (2.59-12.2 mm). Values of (ka)lg observed were so high as to be that can be hardly attainable in conventional gas-liquid contactors. This is due to large alg of small bubbles dispersed in liquid where alg very often exceeds the geometrical surface area of packing. Values of klg range from 2 to 8×10-4m/sec, which are comparable to that of circulating bubbles in the usual systems. The effect of superficial gas velocity on (ka)lg and alg is much greater than that in a countercurrent packed column, while the effect of liquid velocity is approximately same. A liquid-phase energy loss El per unit volume of liquid contained in a bed was newly defined as a measure of microscopic flow intensity and was used for discussion and correlation of mass transfer properties. It was found that the bubble diameter is proportional to El-2/5.