复合塔组件消泡功能的研究

设计了一种具有消泡功能的复合塔组件,该组件上层为带环形降液管的旋流塔板,下层为带中心降液管的筛板。在直径为600mm的有机玻璃塔内,分别以空气-水和空气-十二烷基苯磺酸钠水溶液为不易起泡和易起泡物系,测定了不同气体和液体流量下复合塔组件的塔板压降、板上泡沫层高度等流体力学参数。实验结果表明,当F因子在1.0～1.8kg0.5/(m0.5.s)时,对于易起泡物系,复合塔组件中筛板上的泡沫层高度比普通筛板平均降低16%～47%,消泡能力较强;而对于不易起泡物系,其消泡能力稍弱,泡沫层高度仅降低约15%～20%。在相同的F因子和液体喷淋密度下,复合塔组件中筛板的压降约为普通筛板压降的90%,复合塔组件中旋流塔板的压降仅为普通筛板的30%左右。

Defoaming Function of a Compound Column Internal Assembly

A compound column internal assembly was proposed to reduce foam height and excessive entrainment on the tray deck of a foaming system. The column internal assembly was composed of a sieve tray and a spiral flow tray. The sieve tray with central downcomer was set up under the spiral flow tray with annular downcomer. The hydrodynamics of this column internal assembly was studied in a 600 mm diameter column with air-water system as nonfoaming system and air-sodium dodecyl benzene sulfonate system as foaming system. The compound column internal assembly showed good defoaming function for foaming system. Foam height of sieve tray in the compound column internal assembly is 16%-47% lower than that of common sieve tray at the same gas and liquid flow rate of a foaming system when F-factor is in the range of 1.0-1.8 kg0.5/(m0.5·s). Pressure drop of sieve tray in the compound column internal assembly is 10% lower than that of common sieve tray,while the pressure drop of spiral flow tray is 70% lower than that of common sieve tray at same F-factor and liquid sprayed density.