Research On Hydraulic Performance Of New Developed Structured Packings

The use of packed tower in chemical production has gained popularity in recent decades due to its large capacity,high separation efficiency,and low pressure drop.As the core internal of mass transfer and heat transfer in packed tower,packing has significant influence on the performance of the tower.Thus,the design and development of new suitable packing is always an important research topic for scholars.The Winpak is a type of corrugated plate with diversion windows in its peaks and troughs,which has high mass transfer efficiency.Based on Winpak,two kinds of structured packings named Winapk-C and Staggered Winpak have been put forward,and their hydraulic performance is investigated in this work.Firstly,predictive models for pressure drop and liquid holdup of Winpak-C modular catalytic structured packing(MCSP)are proposed,and a tracer method is employed to determine the liquid residence time distribution(RTD).The Peclet number and axial dispersion coefficient reflecting mixing of packings is discussed and compared with those for traditional MCSP.For a deep understanding of liquid diffusion ability in catalyst bag of Winpak-C,the RTD experiment is conducted with three different catalyst bags.Afterwards,a two-dimensional flow model is used to describe the dispersion ability of the three catalyst bags quantitatively.Lastly,the hydrodynamic characteristics of novel Staggered Winpak are discussed and compared with traditional Winpak packing.Meanwhile,the influence of structured packing height is taken into account as well.In addition,the Leva model and Bain-Hougen correlation are adopted to obtain pressure drop and gas velocity in flooding point,respectively.It turns out that the calculated value has a good agreement with the experiment data.