浆料鼓泡塔内吸附剂微粒增强气液传质的研究

为了考察吸附剂微粒对气液传质的增强,研究了浆料鼓泡塔内异丙醇-水/4A分子筛和叔丁醇-水/分子筛浆料系统内吸附剂微粒对气液传质的过程.考虑液相返混及气液两相间传质,建立了浆料鼓泡塔内气液传质模型,数值求解该模型,数值模拟计算结果与实验结果吻合较好.考察了系统中加入吸附剂微粒后,不同固含率对不同平均粒径下增强因子的影响及粒径对液相传质系数的影响.结果表明,吸附剂微粒的加入使气液传质得到增强.固含率增加,气液传质增强,当固含率超过4%后,气液传质的增强变得缓慢.微粒的粒径越小,对气液传质增强越大.

A Study of Gas-Liquid Mass Transfer Enhancement of Adsorbent Particle in Slurry Bubble Columns

The gas-liquid mass transfer in slurry systems with 4A molecular sieve/isopropanol-water and 4A molecular sieve/tert-butanol-water were investigated for studying the effect of fine adsorptive particles on gas-liquid mass transfer.A liquid back mixing mass transfer model was proposed and theoretically solved.Volumetric liquid mass transfer coefficients of isopropanol-water and tert-butanol-water were calculated based on the model.The calculated results of model accorded well with experiment results.The effects of solid concentration and particle size on enhancement factor were studied.The result showed that increase of solid concentration led to the increase of gasliquid mass transfer,the maximum enhancement factor occurred at solid concentration 4%.The rate of enhancement fell with further increase of solid concentration.Smaller diameter particles was indicated for enhancing gas-liquid mass transfer as compared to larger diameter particles.