作　　者： ; ; ; ;

机构地区： 华东理工大学化工学院化学工程联合国家重点实验室

出　　处： 《华东理工大学学报（自然科学版）》 2010年第2期165-172,共8页

摘　　要： 分别以自来水、醋酸-去离子水溶液（醋酸质量分数分别为1%、5%和10%）为液相,空气为气相,在直径分别为200 mm和400 mm的鼓泡塔内,采用4种气体分布器（单管、四管、分布板和微孔板）,考察当表观气速Ug为0.006~0.250 m/s,鼓泡塔高径比H/D为0.8~7.0时,鼓泡塔有无内构件条件下的液相混合时间。结果表明：对于空气-水体系,当表观气速较低时,增加表观气速,液相混合时间明显缩短,表观气速对混合时间的影响逐渐消失,混合时间随鼓泡塔高径比的增加而迅速增加;当以醋酸水溶液为液相时,在特定表观气速（0.10 m/s）下,体系呈现出发泡性质,tm-Ug曲线出现＂跳跃点＂,该点处液相混合时间为相同条件下自来水体系的2~3倍;高于或低于此特定表观气速,两种体系混合时间的差别较小。即在不发泡条件下,液体离子强度、表面张力对气液相混合不足以产生显著影响。增加导流筒可以使液相混合时间延长。引入横向换热管后,混合时间延长,且表观气速的影响范围变大,表观气速对混合时间的影响不是单调关系,存在极值点。 In the present paper,mixing time was determined in bubble columns of inside diameter 200 mm and 400 mm with and without internal parts within the superficial gas velocity（U_g） of 0.006—0.250 m/s and the high diameter ratios of 0.8—7.0 in the case of different structural parameters,such as aspect ratio（H/D） and sparger types including single-pipe,four-pipe,perforated plate and porous plate,using tap-water and acetate acid aqueous solution as liquid phase and air as gas phase.It was concluded that in the case of low mixing time it dropped strongly with increasing the superficial gas velocity while it hardly changed with U_g and increased significantly with increasing aspect ratio H/D of bubble column in the case of large mixing time.The mixing time in the acetate acid system was 2—3 times larger than that in the tap water system at the ＂jumping point＂,viz.superficial gas velocity of 0.1 m/s due to foaming.Without foaming,the mixing of liquids was not influenced evidently by ion strength and surface tension.The mixing time prolonged by introducing a draft tube.Mixing time was prolonged and the effect of U_g extended in a larger range and showed extremum points when cross heat exchange tube was introduced.

关 键 词： 鼓泡塔 混合时间 有机溶液 发泡 导流筒 换热管

领　　域： [化学工程]