导向筛板-新型浮片式浮阀复合塔板的流体力学和传质性能

设计了一种新型塔板，即导向筛板-新型浮片式浮阀复合塔板，并在内径Φ600的有机玻璃塔内以空气-水为物系，对该复合塔板进行了冷模实验。测定了不同开孔率的复合塔板在固定堰高，改变气速和液流强度情况下的塔板压降、雾沫夹带率、漏液率和清液层高度，并与相同实验条件下的F1型浮阀塔板的流体力学参数进行了对比。此外，本文采用氧解析实验对新型塔板的传质性能进行了研究。实验结果表明，导向筛板-新型浮片式浮阀复合塔板相比F1型浮阀具有通量大、压降低、抗堵性好、传质效率高和浮阀不易卡死、脱落等优点。实验数据表明，该复合塔板的干板压降、湿板压降和雾沫夹带率都随着孔动能因子和液流强度的增大而增大；漏液率随着孔动能因子的增大而减小，随着液流强度的增大而增大；传质效率随着孔动能因子的增大而增大，随着液流强度的增大而减小；清液层高度随着孔动能因子的增大呈现上升、稳定然后下降的趋势，并且随着液流强度的增大而增大。根据实验数据，回归得到了该复合塔板的干板压降(Δp_d=aF²₀+b)、湿板压降(Δp_T=ξF^m₀Lⁿ_W)和雾沫夹带率(e_V=aF^m₀Lⁿ_W)的关联式。

A study of the hydromechanical and effciency properties of a new tray composed of a new floating roundel valve and a flow-guided sieve tray

A new tray composed of a new floating roundel valve and a flow guided sieve tray (GS-FRV) has been designed, and cold flow model experiments for the trays have been conducted in a Φ600mm perspex column with an air-water system. GS-FRV trays with different aperture ratios and F1 floating valve trays were studied. The efficiency performance and hydromechanics of GS-FRV trays have been measured for different air velocities and flow intensities and the results contrasted with those for F1 floating valve trays measured under the same conditions. The experimental results show that the GS-FRV trays have higher capacity, lower pressure drop, better anti-clogging behavior and are less prone to seizure compared with F1 floating valves. The GS-FRV trays also show high efficiency performance. Experimental data show that: the plate pressure drop and entrainment rate increase with the increase of the kinetic energy factor (F-factor) and liquid flow intensity; the weeping rate decreases with the increase of the F-factor and increases with the increase of the liquid flow intensity; the efficiency performance increases with the increase of the F-factor and decreases with the increase of the liquid flow intensity; the clear liquid height first increases, then stabilizes and finally decreases with the increase of the F-factor and decreases with the increase of the liquid flow intensity. According to the experimental data, the regression formulae of the dry plate pressure drop (Δp_d=aF²₀+b), the wet plate pressure drop (Δp_T=ξF^m₀Lⁿ_W) and the entrainment rate (e_V=aF^m₀Lⁿ_W) for the GS-FRV have been derived, and the variation of entrainment rate, weeping rate and clear liquid height as a function of changing F₀ and flow intensity have been obtained.