Study Of Hydrodynamics Of T/P Type Compound Tray And Improving It’s Liquid Flow Capacity

T/P type compound tray is a newly developed tray with perfect performance which has high mass transfer efficiency. It is said that this type tray has high mass transfer efficiency even more than 100%. It is very useful for studying the hydrodynamics of T/P type compound tray. In addition, the liquid flow capacity of this tray has been limited because it has no downcomer with it. Therefore, It is also very useful for studying how to impove the liquid flow capacity of T/P type compound tray.Various factors to the hydrodynamics of T/P type compound tray were comparatively studied in a 600 mm diameter column with air-water system. The froth height, pressure drop and liquid height of the tested compound tray with different plate structural parameter were measured and analyzed at different gas and liquid fluxes. The results showed that the hydrodynamics parameters of the compound tray increased with the gas flux as well as the liquid rate. The effect of fraction open area can not be neglected. The larger fraction open area is , the lower pressure drop is and the higher capacity of compound tray will have been. For keeping low pressure drop and enough mechanical strength, the best fraction open area of dual-flow tray is wanted to be 25%.Discharge coefficients of various dual-flow trays were comparatively studied in a 100 mm diameter column with air system. The discharge coefficients of the tested trays with different proportion between pore size and thickness of tray were different, as well as compound tray with different kind of sieve pore. Under the same experiment condition, the discharge coefficients of upper taper dual-flow trays is maximum, while lower taper dual-flow trays’s minimum.The gas flow field distribution was simulated by FLUENT6.2 under the condition that the gas was passing the dry tray plates. The simulations were in reasonable and in agreement with the experimental results, which explaining the macroscopic phenomenon from the microscopic view. The diameters of shrunk stream formed on the condition that the gas was passing through the different type dual-flow trays were different, which makes the different dry plate pressure drop and discharge coefficients.The total tray pressure drops and dry plate pressure drops of various dual-flow trays were comparatively studied in a 100 mm diameter column with air-water system under the different condition. The capacity of various dual-flow trays were compared by comparing the plate pressure drops generated by the liquid holdup on the tray plates calculated. The results showed that it is useful for impoving the liquid flow capacity of tray plate by combining sieve pores with different discharge coefficients.