水力喷射-空气旋流器中微粒强化气液传质及其机理  

Intensification and mechanism of gas-liquid mass transfer in water-sparged aerocyclone by microparticles

作　　者：赵清华[1] 徐飞[1] 全学军[1] 邱发成 代黎[1] 

机构地区：[1]重庆理工大学化学化工学院,重庆400054

出　　处：《化工学报》2015年第10期3866-3873,共8页CIESC Journal

基　　金：国家自然科学基金项目(21176273)~~

摘　　要：在一种新型高效的气液传质设备——水力喷射-空气旋流器(WSA)中,研究了第三相固体粒子对气液传质的影响。分别采用化学吸收法(CO2-空气-Na OH体系)和物理吸收法(CO2-空气-H2O体系)测定了不同固含率cs、进口气速ug、液体喷射速度uL下的有效相界面积a和液膜传质系数kL,并由此得到总体积传质系数kLa和增强因子E。结果表明,随着粒子固含率增大,kL、a、kLa和E先增大后减小,存在一适宜固含率。在不同进口气速和液体喷射速度下,加入微粒后,kL、a、kLa均增大,但E随进口气速和液体喷射速度增加而减小。微粒加入后,主要从a、kL和表面更新频率S这3方面强化了气液传质,但主要是通过增强表面更新频率S而实现的。The intensification and mechanism of gas-liquid mass transfer inawater-sparged aerocyclone by microparticles were conducted in this paper. The effects of solid concentrationcs, gas inlet velocityug and liquid jet velocityuL on specific mass transfer areaa, mass transfer coefficient of liquid sidekL, volumetric mass transfer coefficientkLa and mass transfer intensification factorE wereinvestigated by using a chemical method （CO2-air-NaOH absorption system） and a physical method （CO2-air-H2O absorption system）. The results indicated that thekL,a, kLa andEincreased and then decreased with the increase of solid concentrationcs,cs has a maximum value. Solid particles could intensify mass transfer, increasingkL,aand kLaunder differentug anduL, whereasE decreased with the increase ofug anduL. The mechanism of solid particles intensifying gas-liquid mass transfer was realized through the three paths from increasinga,kL andS, but the increase of the surface renew frequencyS was the major mechanism.

关 键 词：水力喷射-空气旋流器 微粒 气液传质强化 

分 类 号：TQ021.1[化学工程]