新型旋转填料床的气相传质特性

以CO2-NaOH体系化学吸收测定不同超重力因子、液量和气液比(体积流量比)条件下的有效传质比表面积a，在相同操作条件下，以氨-空气-水体系进行空气吹脱含氨富液测定不同超重力因子、液量和气液比条件下的气相体积传质系数kya，从而得到气相传质系数ky，对其气相传质特性进行了研究. 结果表明，a随超重力因子、液量和气液比增大而增大，kya和ky均随超重力因子和气液比增大而增大，随液量增大而减小. 通过对比可知，在相近操作条件下新型旋转填料床的气相体积传质系数比文献折流旋转填料床的提高36%. 对实验数据进行回归，拟合出a, kya和ky分别与气相雷诺数ReG、液相韦伯数WeL和伽利略数Ga之间的关联式.

Research on the Mass Transfer Characteristics of Gas Phase in a Novel Rotating Packed Bed

The gas phase mass transfer characteristics of a novel rotating packed bed (RPB) were studied experimentally, the interfacial area (a) was determined by chemical absorption in CO2-NaOH system under different conditions of liquid flux, ratio of gas to liquid and super gravity factor, and the gas volumetric mass transfer coefficient (kya) measured by the stripping ammonia-rich water in the novel RPB under the same operational conditions, then the gas mass transfer coefficient (ky) was obtained. The results showed that a increased with the increase of super gravity factor, liquid flux and ratio of gas to liquid, kya and ky increased with the increase of super gravity factor and ratio of gas to liquid, but decreased with the increase of liquid flux. The kya of novel RPB was 36% higher compared with that of a baffled rotating packed bed under the same operational conditions. Based on the experimental data, the empirical formulae of a, kya and ky were developed.