Study On Experiment And CFD Simulation Of The New Structured Packings

Since porous SiC material has so many excellent performances,such as high specific surface area,high porosity,corrosion resisting,thermostability,et al.In this paper,the surface of the SiC structured packing was modified by sodium silicate solution,the wettability on the surface of the SiC structured packing was improved.The experiments were conducted to determine the hydrodynamics and mass transfer efficiency of the SiC structured packing.Results show that the pressure drop,liquid holdup and the gas velocity of flooding point and other parameters of the SiC structured packing are similar to that of the conventional structured packing,and under the same conditions,the porous SiC structured packing has lower pressure drop,lower liquid holdup and higher operating flexibility.The number of theoretical plates may reach more than 5 at experimental condition,thus the SiC structured packing is a new high efficiency structured packing.Moreover,In order to study the fluid flow of the SiC structured packing,appropriate models for porous media and the dodecahedron-parameter fitting model were established for the 2D and 3D simulation.The simulation values and the experimental value of the dry packing pressure drop compared with the error of less than 15% in single phase flow of the SiC structured packing.So the dry pressure drop can predict better by the porous medium model and the dodecahedron-parameter fitting model.The 2D and 3D results show that when the gas velocity is 0.01-0.05m/s,the liquid velocity is 0.001-0.05m/s,the pore diameter is larger than 2.5mm,the skeleton diameter is 0.75-1.25 mm.The gas-liquid phase flow pattern is ideal distribution of the structured surface,and it also has low pressure drop.It is better for conducive to heat and mass transfer of gas-liquid phase.The simulation results can provide theoretical guidance for the industrial design of SiC structured packing in the future.