液相流动方式对波纹规整填料性能的影响

根据液相在波纹规整填料片上呈现渗流、膜状流等不同的流动方式,选择5种不同的波纹规整填料对其流体力学和传质性能进行研究,以探究液相在波纹片上的流动方式对波纹规整填料性能的影响.研究结果表明,液相呈渗流流动的泡沫碳化硅波纹规整填料(SCFP型)有利于液体横向扩散和液膜均匀分布,当液相喷淋密度和气相F因子均较小时,其压降最低,传质效率最高;液相主要呈渗流流动、兼有膜状流动的双层错孔丝网填料(DMⅢ型)有利于波纹片两侧液体交换,强化液体在流动过程中的扰动,其压降及传质性能略逊于SCFP型填料;液相主要呈膜状流动的BX型、DMⅠ型及DMⅡ型填料波纹片表面液膜较厚,横向扩散能力差,其传质效率低于SCFP型和DMⅢ型填料.研究揭示了依靠渗流作用的波纹规整填料具有较好的应用性能,为波纹规整填料的进一步发展开拓了新思路.

Effect of liquid flow behaviour on performance of corrugated structured packing

Five corrugated structured packings are selected based on different liquid flow patterns including seepage flow and film flow. The hydrodynamic and mass transfer performance are studied in order to explore the effect of liquid flow patterns on the performance of structured packings. The experimental results show that liquid mainly presents a seepage flow in the porous structure of SCFP type packing, which benefits the lateral spreading of liquid and uniform distribution of liquid membrane. The SCFP type packing shows the highest mass transfer efficiency and lowest pressure drop when the F factor is lower. Liquid displays a partly seepage flow in the special structure of DMⅢ type packing, which can promote the liquid exchange between two sides of one sheet and intensify liquid turbulence, increasing mass transfer efficiency and reducing pressure drop compared with DMⅠand DMⅡtype structured packings. Liquid flows in the form of film on the surface of BX and DMⅠtype packings and this flow pattern results in a high velocity and a short residence time of liquid film. Thus the mass transfer efficiency of BX and DMⅠtype packings is lower than that of SCFP and DMⅢ type packings. This study shows that the structured corrugated packing with seepage flow presents good performance, opening up a new method to develop structured corrugated packings.