气相扰动下高效萃取填料的开发及性能研究

Development of efficient extraction packing with gas disturbance

针对气液液三相萃取,开发出一种新型高效开窗导流式规整填料,该填料片是在板波纹规整填料片的波峰、波谷处开设导流窗口,从而增加气相的流通空间和扰动频率,进而增加液滴的破碎-聚并频率。实验测定了新型填料的流体力学性能及传质性能。实验结果表明:随气相速度的增加,填料的液泛速度降低,传质单元高度先减小后增加。新型开窗导流式规整填料可有效提高分散相的滴膜交替流动频率,增加传质效果,在相同的操作条件下,新型规整填料的流体力学效果和传质效果较超级扁环填料平均提高11%和44.7%。

For gas-liquid-liquid extraction,a novel structured packing with diversion windows was developed. The geometry characteristics of proposed structured packing were the diversion windows arranged in the crest and trough of the traditional ripple packing. Due to the division windows on the structured packing,the flow pattern was adjusted,that is,the liquid stream on one side of packing can penetrate through the windows and then reach to the other side of the packing. In addition,the flow channel for the gas phase was enlarged and the disturbance frequency was increased. The mass transfer efficiency and hydrodynamic performance of the novel packing were determined experimentally. The results indicate that along with the increase in gas phase flow rate,the flooding velocity decreases,and the apparent height of mass transfer unit first reduces but then increases. The structured packing proposed can promote the dispersed phase＇ s droplet-film flow pattern,which helps enhancing the mass transfer. Under the same operating conditions,the hydrodynamic performance and mass transfer efficiency of the novel structured packing can be increased by 11% and 44. 7% than that of super mini ring packing in average.