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化工学报  2013 

水力喷射-空气旋流器中气液传质特性及其机理

DOI: 10.3969/j.issn.0438-1157.2013.10.023, PP. 3652-3657

Keywords: 水力喷射-空气旋流器,气-液传质,比相界面积,化学吸收法

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Abstract:

对一种新型高效的气液传质设备——水力喷射-空气旋流器(WSA)的传质机理进行了研究。分别采用化学吸收法(CO2-空气-NaOH体系)和物理吸收法(CO2-空气-H2O体系)测定了不同进口气速、不同液体喷射速度下的有效相界面积a和液膜传质系数kL,并由此得到体积传质系数kLa。结果表明,由于WSA中气液间的强交互作用,a、kL以及kLa均随进口气速和液体喷射速度增大而增大。采用量纲分析法对实验数据进行了归纳,拟合出了a、kL和kLa随气相Reynolds数Reg、液相Weber数WeL之间的经验公式:a=0.0024Reg1.25WeL0.079,ShL=35.31Reg0.2303WeL0.13,kLa=6.52×10-8Reg1.48WeL0.21,这些关联式能较好地预测WSA的传质性能。研究还表明,在WSA中的气液射-旋流传质体系中,传质过程符合双膜理论、表面更新理论和溶质渗透理论,但以表面更新机理为主。

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