新结构95型塔板的流体力学性能

引　言传统的板式塔塔板开孔率有限 ,当处理量较大时 ,压降较高 ,板效率降低 .因此开发新型大通量高效率塔板具有重要的现实意义 .本研究通过改进降液管结构和板面设计 ,提高塔板的有效传质区面积 ,开发了一种新型大通量塔板——— 95型塔板 ,因该板的有效传质区面积约占全部塔板面积的95%而得名 .本文以水和空气体系对 95型塔板进行了流体力学和流动性能试验 ,同时与传统筛板进行了比较 ,对试验测定的数据进行了关联 .1　试验装置及筛板结构参数试验塔为一直径Φ1 0 0 0ｍｍ的不锈钢塔 .塔内设置两块塔板 ,上板为测试板 ,下板为气体分布板 …

FLUID DYNAMICS CHARACTERISTICS OF TYPE-95 TRAY WITH A NEW STRUCTURE

A new type of tray called Type-95 tray with a bigger effective mass transfer area and higher tray efficiency is developed and tested, whose downcomer structure is specially designed with a new concept. The fluid dynamics characteristics of the tray, i.e., pressure drop, weeping, liquid height in the downcomer and flow pattern on the tray, are determined on a test rig with a diameter of 1000 mm by air-water system at atmospheric pressure. The experimental results are compared with those of the traditional sieve tray. It indicates that the Type-95 tray has the advantage of lower pressure drop and bigger flux. The related mathematical equations for designing Type-95 tray are derived from the experimental data, which can be basically applied to the design of an industrial tray within allowable engineering deviation. In addition, the eddy and backmixing of liquid on the tray can be eliminated effectively by installing appropriate deflectors. As a result, the liquid flow pattern on the tray is almost changed into plug flow, which might cause an increase of mass transfer efficiency of the tray.