矩形垂直筛板的流体力学性能研究

Research of Hydrodynamic Performance for Rectangular Vertical Sieve Tray

在600mm的有机玻璃冷模塔中,用水-空气体系测定矩形垂直筛板的塔板压降、漏液和雾沫夹带等流体力学性能,确定了合理的塔板结构,使其具有较高的气液通量和较宽的操作范围,空塔动能因子最大可达3.0kg1/2(m1/2.s)-1,液流强度可达21.6m3/(m.h)。并对不同气液流量下塔板的流体力学实验数据进行关联和分析,得出了矩形垂直筛板的干板压降计算关联式以及漏液率随液流强度和空塔动能因子的变化关系,为矩形垂直筛板的设计提供了依据。与新垂直筛板相比,矩形垂直筛板具有更低的塔板压降。

Rectangular vertical sieve tray (RVST) was studied in a φ 600 mm diameter transparent column, with H2O-air system. Reasonable structure of the tray was achieved relying on measuring its important hydrodynamic features such as pressure drop between trays, weeping, entrainment etc., with which the tray enabled to hold very large throughput and to adapt the wide operation range. Upper limit of empty column kinetic factor (F) and liquid flux intensity (Lw) were 3.0 kg1/2/(m1/2·s) and 21.6 m3(m·h), respectively. Hydrodynamic experimental data at different gas and liquid fluxes were analyzed and fitted. From which equation of RVST's dry-plate pressure drop and relationship of weeping ratio with Lw and F were correlated, and could be used as design base for RVST. As a comparison, pressure drop of RVST was even lower than that of new vertical sieve tray (New VST).