化工学报2018，Vol.69Issue(2)：625-632,8.DOI:10.11949/j.issn.0438-1157.20171208
搅拌槽内气液两相混沌混合及分散特性
Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank
摘要
Abstract
Traditional Rushton rigid impeller is often applied to gas-liquid dispersion process in industrial stirred tank reactors. However, poor gas dispersion capacity is occurred behind impeller blades due to easy formation of gas cavitation. In order to improve gas-liquid mixing performance, a rigid-flexible impeller was proposed to intensify gas dispersion process. Time series data of pressure fluctuation were recorded by LabVIEW and the largest Lyapunov exponent (LLE) was calculated by Matlab to analyze chaotic characteristics of gas-liquid mixing behavior, while relative power demand, total gas holdup, and local gas holdup were measured simultaneously in stirred tank with a rigid impeller or a rigid-flexible impeller. Results showed that, under condition of power consumption at 170 W and gas flowrate at 10 m3·h-1, rigid-flexible impeller could strengthen energy transfer and enhance chaotic mixing through rigid-flexible-flow interaction. LLE value of rigid-flexible impeller system was 8.89% higher than that of rigid impeller system. Rigid-flexible impeller could improve relative power demand, total gas holdup, local gas holdup, and more homogeneously gas dispersion, compared to rigid impeller at the same operating conditions.关键词
气液搅拌反应器/刚柔组合桨/气液分散/混沌混合Key words
gas-liquid stirred tank/rigid-flexible impeller/gas-liquid dispersion/chaotic mixing分类
化学化工引用本文复制引用
谷德银,刘作华,张姬一哲,邱发成,李军,陶长元,王运东..搅拌槽内气液两相混沌混合及分散特性[J].化工学报,2018,69(2):625-632,8.基金项目
国家自然科学基金项目(21576033,21636004) （21576033,21636004）
国家重点研发计划项目(2017YFB0603105) （2017YFB0603105）
国家科技支撑计划项目(2015BAB17B01) （2015BAB17B01）
中央高校基本科研业务费专项(106112017CDJQJ228808) （106112017CDJQJ228808）
重庆市社会事业与民生保障科技创新专项(cstc2015shmszx100024).supported by the National Natural Science Foundation of China(21576033,21636004),the National Key Research and Development Project(2017YFB0603105),the National Sci-Tech Support Plan(2015BAB17B01),the Central University of Basic Scientific Research Special Project(106112017CDJQJ228808)and the Chongqing Special Social Undertakings and People's Livelihood Security Science and Technology Innovation(cstc2015shmszx100024). （cstc2015shmszx100024）
