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The Chinese Journal of Process Engineering ›› 2025, Vol. 25 ›› Issue (7): 695-705.DOI: 10.12034/j.issn.1009-606X.224353

• Research Paper • Previous Articles     Next Articles

Numerical simulation of flow field and power consumption characteristics of double-layer combined impeller in a gas-liquid stirred tank

Mengyao ZHANG1,  Yafeng XIAO2,  Zhongtian DONG3,  Shaoping MA4,  Shuang WU4, Mingzhou YU1,  Qinghua ZHANG4*,  Chao YANG4   

  1. 1. School of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China 2. School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China 3. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China 4. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2024-11-13 Revised:2024-12-24 Online:2025-07-28 Published:2025-07-24

双层组合桨气液搅拌槽流动与功耗特性的数值模拟

张梦瑶1， 肖亚峰2， 董中天3， 马少萍4， 吴双4， 于明州1， 张庆华4*， 杨超4   

  1. 1. 中国计量大学机电工程学院，浙江 杭州 310018 2. 西安建筑科技大学化学与化工学院，陕西 西安 710055 3. 南京理工大学化学与化工学院，江苏 南京 210094 4. 中国科学院过程工程研究所，中国科学院绿色过程与工程重点实验室，北京 100190
  • 通讯作者: 张梦瑶 myzh_99@163.com
  • 基金资助:
    中国科学院战略性科技先导专项;国家自然科学基金资助项目

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Abstract: In the realm of chemical synthesis, the aminolytic synthesis of glycine from chloroacetic acid holds significant industrial importance. To surmount the challenges and optimize this process, with a particular emphasis on enhancing gas dispersion performance, elaborate investigation was carried out. Three innovative impeller combinations, namely the double narrow blade propeller (ZCX-ZCX), the narrow blade propeller-parabolic disc turbine (ZCX-PDT), and the narrow blade propeller-staggered fan-shaped parabolic disc turbine (ZCX-SFPDT), were integrated into the gas-liquid mixing operations within stirred tanks. Employing advanced computational fluid dynamics (CFD) techniques, comprehensive comparative analysis was executed. The complex gas dispersion phenomena within the liquid phase were modeled using the Eulerian-Eulerian approach combined with the dispersed k-ε turbulent model to capture the intricate fluid dynamics. It was found that at the same speed, the ZCX-ZCX configuration manifested the lowest values in velocity distribution, turbulent kinetic energy, gas holdup, and power consumption metrics, but the largest average bubble size. Additionally, its distribution uniformity lagged behind that of ZCX-PDT and ZCX-SFPDT, resulting in suboptimal gas-liquid mixing. In contrast to ZCX-PDT and ZCX-SFPDT, the ZCX-SFPDT stirred tank boasted smaller gas cavities and more uniformity of flow field. Notably, under the same Reynolds number regime, ZCX-SFPDT not only curtailed power number by 6.1% compared to the ZCX-PDT tank, but also augmented mass transfer efficiency by 10.9%. It indicated that the arc-shaped structure decreased the form drag on the blade surface and the length of the resistance arm, which was conducive to reducing the stirring power consumption. Generally, these results unequivocally established that ZCX-SFPDT exhibited superior gas-liquid dispersion and mass transfer capabilities, rendering it the prime candidate for gas-liquid stirred tank applications.

Key words: gas-liquid stirred tank, flow field, power characteristics, numerical simulation, double-layer impeller

摘要： 以氯乙酸氨解法合成甘氨酸体系为研究对象，采用数值模拟方法研究了双层三窄叶旋桨式搅拌桨(ZCX-ZCX)、三窄叶旋桨式搅拌桨-抛物线型圆盘涡轮桨(ZCX-PDT)和三窄叶旋桨式搅拌桨-错位圆弧式抛物线型圆盘涡轮桨(ZCX-SFPDT)等三种双层组合桨气液两相搅拌槽流场和功耗特性，比较了三种组合桨搅拌槽中的速度分布、湍动能分布、气含率分布、气泡直径分布以及功耗。结果表明，与ZCX-ZCX组合桨相比，ZCX-PDT和ZCX-SFPDT双层桨搅拌槽内气体分散效果更好，ZCX-SFPDT组合桨搅拌槽内的流场分布最均匀，功率准数比ZCX-PDT降低6.1%，传质效率增加10.9%，更适合应用于气液搅拌槽。

关键词: 气液搅拌槽, 流场, 功率特性, 数值模拟, 双层桨