高速撞击流反应器的微观混合特性的实验研究

发布时间：2018-04-24 00:11

本文选题：撞击流反应器 + 微观混合　；参考：《北京化工大学》2015年硕士论文

【摘要】：近年来,过程强化得到了越来越多的重视,因此各国学者通过对多种反应器进行开发研究,来强化传递过程。其中,撞击流反应器自问世以来,因为其良好的传递特性以及优异的混合效果,在燃烧、干燥、研磨以及萃取等领域都得到了广泛的应用,但目前研究者们对于撞击流反应器的微观混合特性的研究还不够充分和深入。在本文中,采用碘化物-碘酸盐平行竞争反应作为工作体系,对T型不等径撞击流反应器的微观混合性能进行了研究。考察氢离子浓度、撞击流速度等因素对T型撞击流反应器的微观混合的影响,并对微观混合时间进行了估算,最终给出定性的结论。结果表明：随着酸浓度的增大,离集指数呈现上升趋势；撞击动量比PB/PA变大,离集指数变小,且出现临界值,超出临界值后撞击动量比增加对离集指数影响较小；在L/R=0.625时,微观混合性能最好；在恒定摩尔比的情况下,随着体积流量比R的增加,离集指数明显增大；对3-4撞击流反应器进行等比例放大,结果表明三种反应器的离集指数都随着酸溶液流速增加而缓慢下降,整体变化趋势较为一致；估算了实验条件下的微观混合时间tm,其数量级可低至104s,表现出了优异的微观混合性能,说明撞击流反应器是一个理想的快速反应器。
[Abstract]:In recent years, more and more attention has been paid to process strengthening. Among them, impinging flow reactors have been widely used in the fields of combustion, drying, grinding and extraction because of their good transfer characteristics and excellent mixing effect. However, the research on micro mixing characteristics of impinging flow reactor is not enough. In this paper, the micro-mixing performance of T-type impinging stream reactor with unequal diameter was studied by using iodide-iodate parallel competitive reaction as the working system. The effects of hydrogen ion concentration and impinging current velocity on the micro-mixing of T-type impinging current reactor were investigated. The microscopic mixing time was estimated and the qualitative conclusion was given. The results show that with the increase of acid concentration, the dissociation index increases, and the impact momentum is larger than PB/PA, and the separation exponent becomes smaller, and the critical value appears. The impact momentum ratio increases slightly when the critical value exceeds the critical value, and at L/R=0.625, the influence of the impact momentum ratio on the dissociation index is small. The microscopic mixing performance is the best. At constant molar ratio, the separation index increases obviously with the increase of volume flow ratio R, and the 3-4 impinging flow reactor is magnified in equal proportion. The results show that the separation index of the three reactors decreases slowly with the increase of the flow rate of the acid solution, and the overall variation trend is consistent. The microscopic mixing time (tm) under experimental conditions is estimated, the order of magnitude is as low as 104s, which shows excellent microscopic mixing performance, which indicates that impinging flow reactor is an ideal fast reactor.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ052

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