摘要： 聚酯合成过程中，搅拌桨为反应釜中极其重要的部件，搅拌桨的合理设计与优化，可提高搅拌效率并缩短聚酯合成反应时间。 本文对广州擎天材料科技有限公司的聚酯合成反应釜目前工况进行计算流体力学（ＣＦＤ）模拟，发现其反应釜内流体存在混合不均匀及釜内流体“死区”现象严重。通过改变搅拌桨的转速、半径及倾斜角等方法，对搅拌桨进行优化和改进；并结合 ＣＦＤ Ｆｌｕｅｎｔ 商业软件，模拟改进后的搅拌反应釜的宏观流场结构。 结果表明：搅拌桨倾斜角为 ６０°时，反应釜内流体分布更为理想；框板式搅拌桨中间区域的流速增加，有利于减少流体的“死区”范围；将搅拌桨倾斜角改为６０°，聚酯反应时间由 １０ ｈ 缩短至 ７ ｈ，提高了生产效率。

关键词: 搅拌桨, 优化, 计算流体力学, 流动, 混合

Abstract: The Stirring paddle is an important part of the reaction kettle for polyester syn-thesis. The reasonable design and optimization of the stirring paddle contributes to the improve-ment of stiming efficiency and to the reduction of polyester synthesis reaction time. The current working condition of polyester synthesis reaction kettle of Guangzhou Kinte Industrial Co, Ltd. is simulated by CFD, revealing that the fluid is mixed unevenly and the"dead zone"phenom-enon is serious. The stirring paddle is optimized and improved by means of changing the stir-ring speed, radius and inclination angle. The macroscopic flow structure of the modified stirring paddle is simulated via the computational fluid dynamics (CFD) software Fluent.The results show that an inclination angle of 60 for the stiming paddle can result in an improved fluid distribution in the reaction kettle, an increase of flow velocity in the middle area of the frame plate type agitator, a reduction of the "dead zone s. area, meanwhile, it can shorten the reaction time from 10 h to 7 h, which improves the production efficiency utational fluid dynamics;flow;mixing.

Key words: stirring paddle, optimization, computationla fluid dynamics;flow;mixing