Abstract: A mathmatical model for predicting Murphree tray efficiency was proposed with consideration of the mal- distributed weeping, non- uniform liquid flow , unequal directional eddy diffusivity and variation of Murphree point efficiency across the tray. Two typical cases of mal- distributed weeping in industrial columns were used to illustrate how the Murphree tray efficiency could be further decreased in comparison with uniform weeping.The calculated results showed that the extent of Murphree tray efficiency drop depended on the degree of mal-distribution of weeping ,especially when weeping was intensified near the inlet weir as often appeared on large trays due to higher hydrostatic liquid head . The unfavorable effect of mal- distributed weeping should not be ignored in setting up the lowest limit of vapor velocity.

摘要： 在塔板上液体二维不均匀流动和二维涡流扩散模型基础上,建立了不均匀漏液时计算塔板效率的数学模型,并比较了均匀漏液和工业实践中常遇到的2种不均匀漏液对塔板效率的影响,计算结果表明,不均匀漏液对塔板效率及塔板操作气速的下限将产生更为不利的后果.