泡沫碳化硅波纹规整填料的流体力学及传质性能

Hydrodynamic and mass transfer efficiency of foam SiC ceramic structured packing

将碳化硅陶瓷材料用于精馏过程,将该材料与波纹板类填料形状相结合开发出泡沫碳化硅波纹规整填料和光滑碳化硅波纹规整填料。对2种填料进行了流体力学性能与传质性能的测试,研究了泡沫结构对规整填料性能的影响。在直径100mm的有机玻璃塔中使用空气-水体系对填料进行干填料压降、湿填料压降、泛点气速、持液量等流体力学性能测试;在直径100mm的常压玻璃塔中,使用环己烷-正庚烷标准物系进行全回流操作,对填料进行传质性能测试。实验结果表明,在填料外形相同的情况下,与光滑填料相比,泡沫填料的干、湿填料压降较高,泛点气速相当,持液量增大,传质效率显著提高。

This paper describes the application of SiC ceramic foam to distillation. Foam SiC ceramic structured packing and smooth SiC ceramic structured packing are developed according to the structured of Mellapale packing. The hydrodynamic performance parameters including pressure drop for dry and wet packing, flood velocity, and liquid hold-up which are determined in a plexiglass tower of 100 mm internal diameter. The mass transfer efficiency is measured in another glass tower of 100 mm internal diameter by total reflux experiments, using a mixture of n-heptane and cyclohexane at atmospheric pressure. The experimental resuhs show that foam SiC ceramic structured packing has higher dry and wet pressure drop, higher hquid hold-up, higher mass transfer efficiency, and unchanged flood velocity, comparing with smooth SiC ceramic structured packing with the same shape.