冶金搅拌管式反应器内液/固两相流模拟的研究

来源期刊：金属学报2010年第8期

论文作者：赵秋月 张廷安 曹晓畅 刘燕 蒋孝丽

文章页码：1004 - 1008

关键词：冶金； 管式反应器； 搅拌； 模拟

Key words：metallurgy； tubular reactor； stir； simulation

摘    要：以新型冶金多相流搅拌管式反应器为研究对象,建立了搅拌反应器内的液/固两相流动数学模型,采用数值模拟的方法研究了管式反应器内两相流场的速度分布、浓度分布及临界悬浮转速,并与实验结果进行对比.结果表明,增加搅拌装置的管式反应器与传统管式反应器相比,湍流性能大大增强,且不存在流动死区,在搅拌转速为150 r/min时,两相流获得的最大速度为1.58 m/s;搅拌转速为150和250 r/min时,径向混合相对均匀,较低转速(25 r/min)和较高转速(350 r/min)均不利于两相混合;在固体浓度为2%和7.5%时,临界悬浮转速分别为35和38 r/min.

Abstract: The computational fluid dynamics (CFD) method was used to research the velocity and concentration fields in the multiphase flow tubular stirred reactor.A mathematical model of liquid/solid two-phase flow was established and the simulated results obtained by using this model are in better agreement with the experimental ones.The results show that the maximum velocity of solid-liquid phase flow is 1.58 m/s when the rotation speed is 150 r/min and there is no flow dead zone in the tubular stirred reactor because that turbulent flow is strengthened by the stirring action.Radial mixture is better when the rotation speeds are 150 and 250 r/min than when the rotation speeds are 25 and 350 r/min,a proper rotation speed is need to obtain the prefered mixture.The critical impeller speeds are 35 and 38 r/min when the solid concentration are 2% and 7.5%,respectively.