78.5升气升式环流反应器内构件优化
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摘要
研究了78.5L气升式环流反应器内部结构对流动性能的影响规律,并给出最佳区间来为工业装置提供理论指导。利用Fluent软件建立数学模型与实验装置作对比,模拟了不同气液分离区高度与外筒高度比、导流筒长度与外筒长度比和筒内外直径比对流动行为的影响规律。结果表明:数学模型和实验结果误差较小,可以用来预测气升式环流反应器流动行为。气液分离区高度与外筒高度比值过大会导致环流阻力增大,从而不利于流动,比值为0.34~0.36时流动性能最佳;导流筒长度与外筒长度的比值增大可增加气含率和环流液速,但是比值过大会引起气泡的聚合,从而影响流动性能,当比值为0.60~0.62时流动性能最佳;在一定范围内增加内外筒直径比会改善流动效果,但环隙面积过小会增加环形阻力,内外筒直径比为0.73~0.77时流动效果比较理想。
The influence of internals on 78.5L airlift loop reactor was studied and optimal values were obtained for theoretical guidance of industrial equipment. Fluent software was used to establish a mathematical model to compare with experiment result. The influence of height ratio between gas liquid separation zone and external tube, length ratio between diversion tube and external tube, and diameter ratio between diversion tube and external tube on flow behavior of airlift loop reactor was investigated. The error between simulation and experiment results was small, and the mathematical model could be used to predict flow behavior of airlift loop reactor. Circulation resistance became larger when length ratio between gas liquid separation zone and external tube was too large. Reactor flow achieved the best performance when the ratio was 0.34 — 0.36. Increasing length ratio between diversion tube and external tube could increase gas holdup and liquid circulation rate, but an overly large ratio would cause bubbles coalescence, which would affect flow performance. Reactor flow achieved the best performance when the ratio was 0.60 — 0.62. Increasing diameter ratio between diversion tube and external tube could improve flow. Loop resistance was larger when ring gap area was too small and reactor flow achieved the best performance when diameter ratio was 0.73—0.77.
The influence of internals on 78.5L airlift loop reactor was studied and optimal values were obtained for theoretical guidance of industrial equipment. Fluent software was used to establish a mathematical model to compare with experiment result. The influence of height ratio between gas liquid separation zone and external tube, length ratio between diversion tube and external tube, and diameter ratio between diversion tube and external tube on flow behavior of airlift loop reactor was investigated. The error between simulation and experiment results was small, and the mathematical model could be used to predict flow behavior of airlift loop reactor. Circulation resistance became larger when length ratio between gas liquid separation zone and external tube was too large. Reactor flow achieved the best performance when the ratio was 0.34 — 0.36. Increasing length ratio between diversion tube and external tube could increase gas holdup and liquid circulation rate, but an overly large ratio would cause bubbles coalescence, which would affect flow performance. Reactor flow achieved the best performance when the ratio was 0.60 — 0.62. Increasing diameter ratio between diversion tube and external tube could improve flow. Loop resistance was larger when ring gap area was too small and reactor flow achieved the best performance when diameter ratio was 0.73—0.77.
引文
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[2]Jajuee B,Margaritis A,Karamanev D.Measurements and CFD simulations of gas holdup and liquid velocity in novel airlift membrane contactor[J].American Institute of Chemical Engineers,2006,52(12):4079-4089.
[3]袁景淇,张喆,朱欣杰,等.16升气升式环流反应器优化设计的CFD仿真研究[J].控制工程,2010,11(2):213-215.
[4]田小峰,张建成,刘献玲,等.CFD在气升式环流反应器结构优化上的应用[J].现代化工,2013,33(7):121-124.
[5]洪厚胜,张庆文,欧阳平凯,等.用CFD研究气升式内环流生物反应器下降管中的流体力学性质[J].高校化学工程学报,2006,20(1):85-89.
[6]Launder B E,Spalding D B.Mathematical Models of Turbulence[M].London:Academic Press,1972.
[7]薛胜伟,尹侠.气升式内环流反应器流场及传质特性数值模拟[J].化学工程,2006,34(5):23-27.
[8]Camarasa E,Carvalho E,Meleiro L A C,et a1.A hydrodynamic model for air-lift reactors[J].Chemical Engineering and Processing,2001,40(2):121-128.
[9]李鹏.低高径比气升式环流反应器数值模拟分析[D].郑州:郑州大学,2006.