Hydrodynamics Study Of A Novel Vertical Spray Packing Tray

In this paper,the development of trays and packing was reviewed,introducing their merits and current research.On the composition of all types of trays and packing,a novel vertical spray packing tray was designed and built,combining the merits of bubble tray and structured packing.And its’s vertical structure is good for improving the usage efficiency of the tray spacing,structured packing promotes the two-phase contact,spray regime effectively improves the vapor loading.Four different sizes of the novel trays was experimented in a cold model column setup using water-air system,the column has a 500mm diameter and 450mm tray spacing and is made of plexiglass.The hydrodynamics parameters including pressure drop,weeping,entrainment,clear liquid height,were measured.In addition,the mass transfer efficiency of the novel tray was measured with air-water-oxygen system,and the tray’s Murphree efficiency was obtained.Based on data analysis,the tray with cap inclination angle has low performance of high pressure drop,high entrainment rate and low efficiency,and the tray with packing of low specific surface area also has low performance of high entrainment rate,high weeping rate and low efficiency,while,the tray with wire packing of specific surface area has high performance of low pressure drop,low weeping rate,low entrainment rate and high efficiency.Additionally,comparing with flow-guided valve tray,the novel vertical spray packing tray has the high performance of lower pressure drop,less entrainment,higher efficiency,and larger vapor loading.On the basis of experiment data,mathematics model was coupled and compared with experiment data.The mathematics model turned out to be of great reliability and important for the design.