立体传质塔板罩内的气相速度分布

Gas velocity distribution in cover of Combined Trapezoid Spray Tray

罩内气速分布是反映立体传质塔板帽罩结构合理与否的重要参数。文中在600 mm的冷模实验塔内采用热膜测速仪对立体传质塔板(CTST)帽罩内气体速度分布进行了实验研究,发现气体在CTST帽罩内的流动形态大致可以分为3个阶段,即回旋区、发展区、喷射区。各区域内的气速分布特点显著不同,分别起到不同的作用。不同板孔气速条件下,各区域速度分布的变化趋势基本一致。罩内气速分布与压力分布的对比情况较好地反映了罩内动能与势能之间的能量转换规律。

Gas velocity distribution is one of important parameters for testing whether or not the structure of Combined Trapezoid Spray Tray （CTST） is reasonable. The gas velocity distribution in the cover of CTST was measured in an experiment column with diameter of 600 mm by using hot-film anemometry. It shows that the process of gas flow in the cover can be divided into three parts： convolution, development and spraying. The flowing characteristics in every part are different. But the moving trend of velocity distribution is almost the same when gas velocity through plate holes changes. The comparison between velocity distribution and pressure distribution in the cover was made. The result well expressed the energy transition between kinetic energy and potential energy in the cover.