表面改性塑料填料流体力学及传质性能研究

Hydrodynamic and mass transfer performance of modified plastic structured packing

采用新的塑料波纹填料改性方法,有效改善填料成膜性,与同等条件下商业填料进行对比。采用氧解析实验,在直径190 mm的有机玻璃塔内,液相喷淋密度10—36 m3/(m2·h),F因子0.2—3(m/s)·(kg/m3)0.5的实验条件下测定了改性填料及商用填料的流体力学及传质性能。实验结果表明:当液体喷淋密度为10,24,36 m3/(m2·h)时,在相同的F因子下,改性填料的液相传质单元高度Ho L较商用填料分别降低了29.50%,23.00%以及23.95%,同时改性后压降也相应为商用填料的85.37%,89.71%和88.35%。表明该改性方法在低喷淋密度下对塑料填料性能提升显著。此外,对实验填料的Ho L、压降进行了关联,采用狭通道液膜波动理论对填料塔内部液泛进行了探讨,为塑料填料的工业应用提供了设计基础。

A new method was used to modify the film forming of plastic structure packing and the comprehensive performance with commercial packing was compared in the same conditions .In order to evaluate the hydrodynamics and mass transfer performance of the commercial and modified structured packing with textured surface , the experiment of oxygen desorption from water was carried out in a packed column of φ190 mm under the condition of liquid spray density 10-36 m3/（m2· h） and F factor 0.2-3（m/s）· （kg/m3）0.5.The result shows that with liquid spray density of 10, 24, 36 m3/（m2 · h）, the height of liquid transfer unit HoL of surface modified structured packing is decreased by 29.50%,23.00% and 23.95% respectively in comparison with those of a commercial packing, while the pressure drop is lower by 85.37%, 89.71% and 88.35% than commercial packing respectively , which demonstrates a significant improvement in mass transfer performance for the surface modified packing.In addition, the correlations of HoL and pressure drop were obtained , flooding phenomenon was discussed by narrow channel theory and the foundation of industrial design was built .