导向筛板-导向浮阀塔板性能的实验研究

采用空气-水-氧气物系,在内径为Φ600 mm,塔板间距为350 mm的冷模精馏塔内,分别研究了带有14个浮阀的FGS-VT-14塔板和带有8个浮阀的FGS-VT-8塔板的流体力学与传质性能。根据实验数据,回归得到了FGS-VT-14塔板的干板压降和湿板压降关联式分别为Δp d=ξu2hρg/2和Δp w=a1Fn h Lm w。实验结果表明,与FGS-VT-8相比,FGS-VT-14的干板压降降低3%、湿板压降降低16%(浮阀升起后)、漏液降低90%、雾沫夹带升高55%、塔板效率增大12%,具有更好的综合性能;与导向筛板相比,FGS-VT-14塔板的操作性提高了10%～20%、塔板效率提高了7%、湿板压降降低了8%(浮阀升起后)。

Experimental studies of the flow-guided sieve-valve trays

The performance of two types of flow-guided sieve tray with 14 and 8 valves (FGS-VT-14 and FGS-VT-8, respectively) has been studied in an air-water-oxygen system within a 600mm diameter plexiglass column with a 350mm tray spacing. The regression models of the dry-plate pressure drop (Δp_d=ξu²_hρ_g/2) and wet-plate pressure drop (Δp_w=a₁Fⁿ_hL^m_w) of FGS-VT-14 were obtained from the experimental data. The results indicated that the performance of FGS-VT-14 was better than FGS-VT-8 because its dry-plate pressure drop, wet-plate pressure drop (when the valves start to open) and weeping were reduced by 3%, 16% and 90%, respectively, and the tray efficiency was improved by 12%, although the entrainment increased by 55%. Compared with conventional flow-guided sieve trays, the operating flexibilities of the two FGS-VT units were improved by 10%-20%, and the tray efficiency increased by about 7%. On increasing the gas velocity, the pressure drop decreased by about 8%. 