Abstract: At present, studies on the sieve tray tower, one of the oldest towers, are widely carried out. An especially complicated one is on the structures of a sieve tray tower at different bubbles layers and the discrimination between regimes on the tower. This study is limited to direct and qualitative description. Comparatively, the study on the spray regime transferring principles is even weaker. This paper is baaed on the force equilibrium. In the paper, the effect of the local area void fraction in the liquid - gas mixture layer on a sieve bay is considered and the calculation model is developed. The comparision between experimental and the calculation results shows that the model is applicable to practical engineering design.

摘要： <正>筛板塔是应用历史最久的塔型之一。至今人们仍在对筛板塔进行大量的研究,但对筛板塔处于不同鼓泡层的结构及筛板塔各操作状态之间的划分这一课题,还基本上限于一些定性的直观描述。筛板塔的各操作状态之间主要由两点速度划分,即漏液气速和喷射转变气速。在他们之间筛板处于泡沫工况,当气速高于喷射转变气速时,筛板塔处于喷射工况。这两种工况是人们最感兴趣的,这不仅因为在工业上这两种工况用得最多,而且还因为在流动泡沫工况下气体为分散相,液体为连续相,一旦转变为喷射工况就发生了相变,气体变为连续相,原来是连续相的液体则被气体吹散为小液滴的分散相。这种工况的转变必然强烈地影响着两相间的传质,要掌握塔板上两相间的传质规律,首先要确定它是处于何种工况。