基于均龄理论高效计算萃取塔轴向混合分布

发布时间：2018-01-06 13:37

本文关键词：基于均龄理论高效计算萃取塔轴向混合分布　出处：《化工学报》2016年05期 　论文类型：期刊论文

【摘要】：在验证了CFD单相流场模拟的基础上,采用均龄理论计算了中试转盘塔内的轴向混合分布,并将计算结果和理论平均停留时间以及组分输运模型计算值进行对比。结果表明:均龄理论能准确预测转盘塔内的轴向混合信息,且其计算时间只需数十秒,远小于传统组分输运模型所需的两周时间,具有低计算量的特点;同时均龄理论克服了传统组分输运模型无法模拟轴向混合空间分布的缺陷,为萃取塔内部结构优化提供了更多信息,是一种高效的模拟方法。后续均龄理论模拟结果的分析预示着转盘塔内的流动近似呈现出级内全混、级间平推的特点,符合萃取操作的需求;而相对于转盘间良好的混合作用,静环间存在明显的流动死区,造成一定的非理想性,其结构有待于进一步的优化。
[Abstract]:Based on the verification of CFD single-phase flow field simulation, the axial mixing distribution in the pilot-scale turntable tower is calculated by using the mean age theory. The calculated results are compared with the theoretical mean residence time and the calculated values of the component transport model. The results show that the average age theory can accurately predict the axial mixing information in the rotating disc tower and the calculation time is only tens of seconds. It is much shorter than the two-week time required by the traditional component transport model and has the characteristics of low calculation. At the same time, the average age theory overcomes the defect that the traditional component transport model can not simulate the axial mixing space distribution, and provides more information for the optimization of the internal structure of the extraction column. The analysis of the results of the subsequent average age theory indicates that the flow in the rotary tray is approximately the characteristics of full mixing in the stage and flat push between the stages, which accords with the requirement of extraction operation. Compared with the good mixing effect between the rotating discs, there is an obvious flow dead zone between the static rings, which leads to some non-ideal, and its structure needs to be further optimized.
【作者单位】：华东理工大学国家盐湖资源综合利用工程技术研究中心;
【基金】：国家自然科学基金项目(21206038)~~
【分类号】：TQ053.5
【正文快照】： 引言转盘塔是一种重要的萃取设备,因其结构简单,处理量大,安装维修方便的优点而广泛应用于化工分离过程[1]。相比较于其他搅拌型萃取塔,转盘塔的能耗较低,但其萃取效率也明显偏低[2],这与塔内轴向混合有着密切的联系[3]。萃取塔内的搅拌混合在保证两相充分接触的同时也会引起

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