带气体分布器表面曝气反应器的气液传质特性  

Gas dispersion and gas-liquid mass transfer in surface aerated stirred tanks with gas sparging

作　　者：李向阳[1] 禹耕之[1] 毛在砂[1] 

机构地区：[1]中国科学院过程工程研究所

出　　处：《化学工程》2007年第2期30-33,51,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(20306028;20236050);国家'973'计划资助项目(2004CB217604)

摘　　要：在高径比较大的表面曝气反应器中,由表面吸入的气体较难分散到反应器的底部,为增强反应器的气液传质性能,需要将反应器底部供气和表面曝气的配置优化。在直径380 mm、液位为530 mm的表面曝气反应器中,表观气速为2.45,4.90,7.35 mm/s的条件下,实验测定了3种不同构型的双层桨组合的气液传质系数和搅拌功率。结果表明,表面曝气结合气体分布器供气能有效改善气液反应器内气体的整体混合状况,以较低的功耗达到气体分布均匀、增强气液传质性能的目的。Gas dispersion in liquid phase is generally non-uniform in gas-liquid surface aerators with large height-todiameter ratio. In a stirred vessel of 380 mm ID and 530 mm level, the respective advantages of surface aeration and sparger aeration were combined felicitously. Three dual-impeller configurations were tested with respect to power consumption, gas-liquid volumetric mass transfer coefficient with the combination of surface aeration and sparger aeration at the gas superficial velocity of 2.45,4.90 and 7.35 mm/s. It shows that gas dispersion in liquid phase can be improved and better gas liquid mass transfer performance is achieved with lower total power consumption.

关 键 词：表面曝气 气体分布器 双层桨 气液传质系数 搅拌功率 

分 类 号：TQ021.4[化学工程]