Experimental Study And Numerical Simulation Of Hydrodynamics Performance For Gas Passing Through The Fixed-Valve

In this paper, according to the need of developing new style column, new style fixed-valve tray - rectangular fixed-valve tray with fold edges and common rectangular fixed-valve tray were studied from experiments and CFD simulation.At first, in the process of experiments, it were measured that dry plate pressures drop and point pressures in the flow fields around the single fixed-valve and double fixed-valves under different velocities by using of Pitot tube. After that point pressure was transformed to point velocity, two dimensions flow plane of flow fields around fixed-valve were plotted to observe the difference between of the fixed-valve tray with fold edges and the common rectangular fixed-valve tray on the distributions of flow fields and pressures, to provide comparisons and refer-rence for CFD simulation.Secondly, with commercial CFD code - FLUENT, Three dimensions turbulence flow fields of fixed-valve trays with single valve and double valves were computeed by means of RNG k-e turbulence model in the system of Lagrange. By comparing the dry plate pressures drop and distributions of velocities simulated on single valve with those of double valves, it was found that there was intense turbulence in the flow fields around fixed-valve, there were eddy areas between valve side orifices and tray wall, there were eddies above the valves too, these led to the complex behaviors of gas perforating valve, these had a great effect on the gas-liquid mass transfer process.At the same time, in order to prevent the disadvantageous effect of gas between one valve with another on the gas-liquid mass transfer, it was very effective to change the fields of gas perforating valve by folding the edges of valve.The study provides gists for the design and development of new style fixed-valve trays and establishs bases for further studies.