摘要
在气液相並流向下流动的滴流床中,用CO_2-空气-NaOH系统在液相进行拟一级反应的化学吸收求取气液有效界面积和脉动流时分散气泡的平均直径,並讨论气液相流速,分散气泡大小与气液有效界面积之间的关系。实验表明:分散气泡的大量形成及直径变化是决定气液有效界面积的主要因素。要强化传质,除了增加气液流速外还可以减小颗粒度。
In a trickle bed with gas and Liquid cocurrently flowing downward, chemical absorption with pseudo-first order reaction in the liquid phase was carried out, using air-CO_2-NaOH system. The effective gas-liquid interracial area and average dispersedbubble diameter for pulse flow were determined. The relationships between interracial area and dispersed-bubble diameter, between inteffacial area and flow rates of gas and liquid were obtained. Experiments show that the dispersed-bubble diameter determines the magnitude of effective interracial area. So the rate of mass transfer can be intensified by reducing the particle diameter and increasing the gas and liquid velocity.
关键词
滴流床
反应器
气泡
传质
界面积
reactors
interracial area
mass transfer
bubble
trickle bed
