Measurement of gas-liquid mass transfer in an agitated vessel -A comparison between different impellers
Measurement of gas-liquid mass transfer in an agitated vessel -A comparison between different impellers
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DOI：
10.1252/jcej.34.579
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发表时间：
2001-05
影响因子：
0.8
通讯作者：
Yonggang Zhu;P. Bandopadhayay;Jie Wu
中科院分区：
文献类型：
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作者：
Yonggang Zhu;P. Bandopadhayay;Jie Wu
在具有气体喷雾的搅拌容器中进行了传质速率的测量。在相同的流体和水槽条件下，系统地考察了几种常用叶轮(Lightnin A315和A310、45°斜叶片涡轮、凹叶片涡轮、Rushton涡轮和带孔Rushton涡轮)的传质性能。用动态放气法测量了氧气从气体到去离子水的传质速率。用极谱溶解氧探头(Orion PCM800)测量了水体中溶解氧浓度的变化。目前的数据与Linek等人以前的出版物中的数据显示出合理的一致性。(1987)，Hickman(1988)，Warmoeskerken和Smith(1989)，Martin等人。(1994)，以及Chen和Chen(1999)。所有的数据表明，van‘t Riet(1979)式，即Kla=α(P/V)0.4Us0.5，很好地(在±30%以内)代表了Kla与比功率P/V和表观气速us的相关性。然而，目前的数据似乎表明，径流叶轮提供的传质速率略高于轴流叶轮(17%)。
Measurement of mass transfer rate was carried out in an agitated vessel with gas sparging. The performance of mass transfer of several commonly used impellers (i.e. Lightnin A315 and A310, 45° pitched blade turbine, concave blade turbine, Rushton turbine, and Rushton turbine with holes) were examined systematically under the same fluid and tank conditions. A dynamic gassing-out method was used to measure the mass transfer rate of oxygen from gas to the de-ionised water. The variation of the dissolved oxygen concentration of the water was measured by a polarographic dissolved oxygen probe (ORION PCM800). The present data shows reasonable agreement with that in previous publications such as those of Linek et al. (1987), Hickman (1988), Warmoeskerken and Smith (1989), Martin et al. (1994), and Chen and Chen (1999). All the data collected here shows that van’t Riet’s (1979) expression, i.e.: kLa = α(P/V)0.4Us0.5 represents reasonably, well (to within ± 30%) the correlation of kLa with specific power P/V and superficial gas velocity Us. However, the present data seem to indicate that the radial flow impellers provide slightly higher (17%) mass transfer rate than the axial flow impellers.