超重力旋流式冷氢箱的微观混合性能  

Micromixing Efficiency of a Supergravitational Swirling-Type Quench Box

作　　者：王振元[1] 于坤[1] 石岩[1] 黄子宾[1] 程振民[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化学反应工程与工艺》2013年第6期481-487,共7页Chemical Reaction Engineering and Technology

基　　金：中国石油天然气集团公司资助项目(2010E-2004-02);国家自然科学基金项目(21076072)

摘　　要：开发了一种具有多重旋流结构的超重力旋流式冷氢箱，并以α-萘酚与对氨基苯磺酸重氮盐之间的串联竞争反应为测试体系研究了操作条件对其微观混合过程的影响，并以离集指数表征微观混合性能。结果表明，离集指数随气体流量的增加而显著减小，随液体流量的增加而增大。这说明气液两相在超重力旋流式冷氢箱内实现了良好的接触，液体可以充分利用气体的推动作用提高自身的湍动程度和微观混合效果。在实验基础上，采用团聚模型获得了离集指数与微观混合时间的关系，并计算出超重力旋流式冷氢箱的微观混合时间为40～100ms，与搅拌器处于同一量级，且远小于自身的平均停留时间，说明超重力旋流式冷氢箱具有优异的微观混合性能。A novel supergravitational swirling-type quench box with multiple swirling flow structures was designed. In order to study the effects of operating conditions on the micromixing process, the cold model experiments were carried out based on the competitive and consecutive reaction between 1-naphthol and diazotized sulphanilie acid, and the segregation index was used to characterize the micromixing performance. The results showed that the segregation index decreased sharply with the increase of the gas flow rate, while increased with increase of the liquid flow rate. It indicated that the gas and liquid could be intimate contact in the new designed quench box, while the turbulence intensity and micromixing efficiency of the liquid could be notablely improved by driving effect of the gas phase. The relationship between segregation index and micromixing time was obtained according to the incorporation model. Under the experimental operating conditions of this work, the calculating micromixing time was 40-100 ms, which was far less than the average residence time and was of the same order of magnitude as the meehanicaly stirred tank, which illustrated that the supergravitafional swirling-type quench box owned excellent micromixing performance.

关 键 词：冷氢箱 旋流 微观混合 团聚模型 微观混合时间 

分 类 号：TQ027[化学工程]