摘要
多重参考系(multiple reference frame,MRF)作为搅拌模拟常用方法,其动区域大小的取值却无准确定义,任意取值会造成计算结果与实际误差大,易造成工程设计失误。为探究挡板数量分别为2和4下不同挡板宽度、搅拌高度对反应器内流场特性的影响,基于MRF对PY式反应器内最佳动区域大小进行确定后对不同动区域大小下气体混合特性进行模拟,并基于最佳动区域大小对不同挡板数下挡板宽度、搅拌高度对反应器内气液混合的影响进行模拟计算。研究结果表明:动区域大小不同计算,结果差异可高达9.7%,搅拌功率最大差异小于5%,其中直径较高度对气液混合影响大,不同直径搅拌死区面积占比最高差异高达12.32%,不同高度最高差异仅3.38%,与搅拌器呈高度比为2.2,直径比为1.4时模拟误差最小为1.86%;挡板宽度相同时挡板数量为4较数量为2搅拌功率高,混匀效果更好;搅拌高度越低,气体向两侧扩散越少,搅拌功率越小。研究结果可为改善PY式反应器内气液混合效果提供参考。
As a common method for stirring simulation,the value of the dynamic region size of multiple reference frame(MRF)is not accurately defined,and arbitrary value will cause a large error between the calculation result and the actual result,which is easy to cause engineering design errors.In order to explore the effects of different baffle widths and stirring heights on the flow field characteristics in the reactor when the number of baffles is 2 and 4 respectively,the optimal dynamic region size in the PY reactor was determined based on MRF,and the gas mixing characteristics under different dynamic region sizes were simulated.The effects of baffle width and stirring height on gas-liquid mixing in the reactor were simulated based on the optimal dynamic zone size.The results show that the difference of calculation results with different dynamic zone sizes can be as high as 9.7%,and the maximum difference of stirring power is less than 5%.Among them,the diameter and height have a great influence on gas-liquid mixing.The maximum difference of dead zone area with different diameters is as high as 12.32%,while the maximum difference of stirring dead zone with different heights is only 3.38%.When the diameter ratio is 1.4,the simulation error is 1.86%.When the baffle width is the same,the number of baffles is 4,the stirring power is higher and the mixing effect is better than that when the number is 2.The lower the stirring height,the less the gas diffuses to both sides,and the smaller the stirring power.The research results can provide reference for improving the gas-liquid mixing effect in PY reactor.
作者
徐广琦
石艳
陈强
李培华
税小叶
XU Guang-qi;SHI Yan;CHEN Qiang;LI Pei-hua;SHUI Xiao-ye(School of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,China;Sichuan Yibin Jiangyuan Chemical Machinery Manufacturing Co.,Ltd.,Yibin 644000,China)
出处
《科学技术与工程》
北大核心
2025年第25期10829-10839,共11页
Science Technology and Engineering
基金
四川省科技厅重点研发项目(2022YFG0068)
宜宾市科技计划重点项目(2022GY003)。
关键词
气液搅拌
多重参考系
多相流
动区域
特性分析
gas-liquid agitation
multiple reference systems
multiphase flow
dynamic region
characteristic analysis
