CFD Simulation And Structure Optimization Design Of Gas-liquid Two-phase Flow In Tridimensional Rotational Sieve Tray

Tridimensional rotational sieve tray(TRST)is an efficient general-purpose tower in the independent research of hebei university of technology.It has the advantages of small pressure drop,good mass transfer and great processing ability,at the same time,there is no liquid and foam entrainment under the condition of gas-liquid flow operation.The gas-liquid flow on the tridimensional rotational sieve tray is the main factor to determine the efficiency of mass transfer.Therefore,the study of gas-liquid two-phase flow field will be of great significance to the selection of the operation conditions and the optimization of the structure.In this paper,using the commercial software FLUENT14.5 to solve,and STAR-CCM+ was used to partition the model.By using the Realizable k-? turbulence model and Eulerian multiphase flow model,the two phase flow of gas and liquid in the tridimensional rotational sieve tray is studied.At the same time,the blade number and blade rotation angle of the tridimensional rotational sieve tray are optimized.The simulation study is carried out,and the results are compared and analyzed.It also provides reference for the future structure enlargement and optimization.The results show that: the influence of different liquid phase spray density and gas phase kinetic energy factor on the flow field inside the tray.It is found that the velocity of gas liquid increases with the increase of the liquid spray density or gas phase kinetic energy factor,and the radial direction is fluctuating.The size of the liquid phase spray density or gas phase kinetic energy factor does not have much influence on the velocity distribution trend.The distribution of flow field in a sieve plate cyclone is found.At the same cross section,circumferential ?=15° is greater than the speed of ?=30°.In different sections,the speed of ?=15° circumferential equals R increases along the radial direction,showing the trend of fluctuations.?=30° circumferential equals the speed of the sieve plate on part of the fluctuation trend R increases along the radial direction.The improvement of R in the middle and lower part of the sieve plate increases first and then decreases.For the distribution of pressure inside the plate,from top to bottom,the overall pressure is decreasing.In the swirl vane area,the pressure is higher and the surface of the blade is mainly concentrated in the upper part of the plate.The pressure is in a trapezoidal distribution;in the upper and middle part of the plate.There is obvious pressure difference on the upper and lower surface of the blade.In the lower part of the plate,the pressure difference is small.During the optimization of the plate structure,founding that the plate blade rotation angle 120°,leaf number 8 were ideal structure for the plate.