新型导向圆盘形浮阀塔板的流体力学性能

A new flow-guided round floating valve tray and its hydromechanics

在内径为Φ600 mm,板间距为350 mm的有机玻璃塔内,以空气-水为物系,对新型导向圆盘形浮阀塔板进行冷膜实验。对3种不同开孔率的该种塔板进行流体力学性能测试,测定了不同气速和液流强度下的板压降、雾沫夹带、漏液等流体力学参数,回归得到了新型导向圆盘形浮阀塔板的干板压降和湿板压降的计算公式。实验结果表明,筛孔气速在3～11 m/s的范围内,新型导向圆盘形浮阀塔板的干板压降和湿板压降都要低于F1型浮阀塔板。雾沫夹带随筛孔气速和液流强度的增大而增大,新型导向圆盘形浮阀塔板的雾沫夹带与F1型浮阀接近,空塔气速操作上限都在2.0 m/s左右。漏液随着气速的增大而减小,随着液流强度的增大而增大,新型导向圆盘形浮阀塔板的漏液要明显低于F1型浮阀塔板,空塔气速操作下限在0.53m/s左右,而F1浮阀的空塔气速操作下限在2.6m/s左右。

A cold-flow model experiment with a new flow-guided round floating valve tray has been conducted in a Φ600 mm Perspex column with an air-water system.Three trays with different hole area ratios were studied.Hydromechanical parameters such as tray pressure drop,entrainment and weeping of trays were measured and the regression model of the dry plate pressure drop and wet plate pressure drop were obtained.According to the results,the tray pressure drop of the experimental tray was significantly lower than for an F1 floating valve tray with sieve pit gas velocity in the range 3-11m/s.The entrainment of the experimental tray increased with sieve pit gas velocity and liquid flow rate,and was close to the value for F1 floating valve trays.The upper limit of the gas velocity was 2.0m/s.The weeping rate of the experimental tray increased with liquid flow rate,and there was a negative relationship between weeping rate and sieve pit gas velocity.It was also found that the weeping rate of the experimental tray was significantly lower than that of the F1 floating valve tray.The lower limit of the gas velocity was 0.53m/s,whereas the value for the F1 floating valve tray under the same conditions was 2.6m/s.