组合导向浮阀塔板的雾沫夹带实验及CFD模拟

Entrainment experiments of combined directed valve tray and CFD simulation

对组合导向浮阀塔板进行了水力学实验,测定了2块直径1m、不同浮阀排布的组合导向浮阀塔板的雾沫夹带和相关水力学数据。根据实验塔板的结构和尺寸参数建立几何模型,采用Fluent 6.3.26软件对板上气液两相流动进行CFD模拟,考察了塔板上的气液两相流动状况。清液层高度和雾沫夹带的模拟结果与实验结果吻合较好,验证了模拟的准确性。对两块不同浮阀排布的组合导向浮阀塔板的雾沫夹带和板上液体反向流进行了分析,结果表明在适当位置用导向能力更强的梯形浮阀代替矩形浮阀可有效降低雾沫夹带率和液体反向流比例,雾沫夹带率的实验值和模拟值分别降低了13.4%和10.6%,液体反向流比例降低了12.8%。研究结果表明,通过CFD模拟可望指导两种浮阀的合理排布和塔板的优化设计。

Hydraulic experiments were carried out on two types of combined directed valve tray. The entrainment and related hydraulics data of two 1 m diameter trays with different float valve arrangement were measured. The geometric model was established according to the structural and size parameters of experimental trays and the flow field of combined directed valve tray was simulated with Fluent 6.3.26,and the flow pattern characteristics was investigated. The simulation results of clear liquid height and entrainment agreed well with experimental data, which proved the validity of simulation. The entrainment and liquid backflow of two trays were analyzed and the results showed that the entrainment and liquid backflow could be efficiently decreased by properly arranging trapezoidal float valves with stronger oriented ability instead of rectangular float valves on tray. The average entrainment of experimental and simulation results decreased by 13.4% and 10.6%, respectively, while the average of backflow ratio decreased by 12.8%. This research results showed that CFD simulation was expected to provide a guidance for arrangement of two types of float valve and optimization design of the tray.