网板填料复合旋转床的传质性能

摘要

Rotating Compound Bed (RCB) with perforated sheet and packing, which exhibits the property of high efficiency and low pressure drop, is a novel type of rotating bed different from rotating packed bed and rotating zigzag bed. Distillation experiments were carried out with ethanol-water systems at atmospheric pressure and under total reflux in the RCB. The four kinds of rotors in the RCB are concentric rotating plates filling Pall ring radially, axially and circumferentially and no filling, respectively. The results show that the height equivalent of a theoretical plate (HETP) of RCB reaches a minimum with the increase of gas phase loading factor or rotating speed, the minimum value is 28 mm when the rotating speed is 800 r⋅min−1 and gas phase loading factor is 1.3 kg0.5·m−0.5·s−1. The mass transfer performance of RCB can be enhanced by filling Pall ring, the priority of gas-side volumetric mass transfer coefficient from big to small is as follows:filling circumferentially, filling axially, filling radially, no filling.%　　网板填料复合旋转床(RCB)是一种有别于填料床和折流床的新型旋转床，具有传质效率高和压降小的特点。以乙醇-水溶液为物系，在常压、全回流操作条件下，对同心环网板、同心环网板间径向填充鲍尔环、轴向填充鲍尔环、周向填充鲍尔环的这四种转子进行精馏实验。结果表明：网板填料复合旋转床的等板高度随气相表观动能因子和转速的增大出现最小值，在转速800 r⋅min−1，气相表观动能因子1.3 kg0.5⋅m−0.5⋅s−1时，其值为28 mm。鲍尔环的填充有利气液传质，其不同填充方式的气相总体积传质系数由大到小的顺序为：周向填充、轴向填充、径向填充、无填充。