关键词: 立体连续传质塔板, 并流塔板, 流体力学, 塔板效率

Abstract: Parallel flow trays have attracted considerable attention to its high mass-transfer efficiency.The new tridimensional parallel flow tray with continuous mass-transfer combines two parallel flows and LLC-tray(LLCT).The hydrodynamic characteristics of the tray,such as dry-pressure-drop,wet-pressure-drop,entrainment and weeping,and mass-transfer efficiency were measured and relevant correlations were obtained.The pressure drop and entrainment of the tray were lower.In a certain range of liquid flux,the effect of liquid flux on entrainment was negligible.When the gas velocity decreased to a critical point(the gas velocity through the plate hole was about 12 m·s^-1),the weeping of ring flow started earlier than the converged flow.The liquid flow rate was 30% higher than that with LLCT because the parallel flow tray avoided the liquid stagnation zone on common countercurrent trays.With several downcomers the flow distance of liquid was shorter and the gradient of liquid level was reduced.The mass transfer efficiency of the tray was higher than that of LLCT and the efficiency of ring flow was higher than converged flow because of different length of liquid passage.

Key words: LLC-tray, parallel flow tray, hydrodynamics, plate efficiency