Performance Characteristics Of Several New High Efficiency Structured Packings

With the industrial development of chemical separation process, high efficiency and low-power performance are needed particularly. And metal wire corrugated structured packing has many advantages, including its high theoretical plate number and low pressure drop etc, ipso facto, it plays an important role in modern industrial separation, and also is widely used in a variety of distillation process. High efficiency structured packing wire mesh packing is a new structured packing for its special arc corrugation structure compared with traditional packings. The arc design makes the direction of liquid film flowing along the sheet surface change continuously, thus the turbulent flow increases, which facilitates increasing mass transfer efficiency.In this paper, the cold-flow model test was carried out with four kinds of high efficiency structured packings (SQ-350, SQ-700, BH-700, Y-700) to obtain their hydrodynamics and mass transfer performance. Results indicated that the pressure drop of structured packing increased with increasing gas velocities, liquid spray densities and specific area. For different packings with same areas, the pressure of SQ-700is lower than700Y, but operating range is higher than the700Y. Results of mass transfer performance showed that the value of HETP for structured packings increased unobviously with the increasing of gas velocity under the same liquid spray density; when the gas velocity was fixed, mass transfer efficiency increased with the increasing of liquid spray densities. Compared with traditional packings with same special area, when liquid spray density was in the experimental range of15.29m3/(m2·h)≤L≤30.57m3/(m2·h) and the percentage would increase with the increase of liquid spray density. When L was fixed at20.38m3/(m2·h), the average value of K,a for SQ-700is0.031(0.5975m/s·(kg/m3)0.5≤F≤1.336m/s·(kg/m3)0.5), which exceeds56.4%than700Y(Kxa=0.014s-1when1.0318m/s(kg/m3)0.5≤F≤1.5104m/s@(kg/m3)0.5).