气升式环流反应器数值模拟方法选择及导流筒高度影响  

Selection of numerical simulation method for airlift loop reactor and influence of draft tube height

作　　者：刘华冰 张帅[2] 原平方[2] 

机构地区：[1]河北新启元能源技术开发股份有限公司,河北沧州061108 [2]天津大学化工学院化学工程联合国家重点实验室,天津300072

出　　处：《精细与专用化学品》2017年第4期33-41,共9页Fine and Specialty Chemicals

基　　金：973项目(2012CB720500);国家自然科学基金项目(21176171);天津市自然科学基金重点项目(12JCZDJC28700)

摘　　要：气升式环流反应器(ALR)是一种结构简单,混合传质效率较高的新型多相流反应器。现已广泛应用于化学工程、生物工程和冶金行业中。开发高效的新型气升式环流反应器具有切实的现实意义。本文通过CFD数值模拟的方法,对反应器内部流动状态进行模拟,并与冷模实验得到的数据对比分析。在数值模拟过程中考察了不同湍流模型以及相间作用力对模拟可靠性的影响。在冷模实验的基础上,利用数值模拟的方法分析了不同导流筒高度对反应器流体力学性能的影响。结果表明所建立的二维CFD模型可以定性地反映反应器内部的气含率分布。升力模型的引入可以使反应器内部气体的径向分布与实际情况更为接近,RNG模型对高雷诺数下反应器内气含率的波动有较好的响应。较短的导流筒可以得到较高整体气含率。The airlift loop reactor（ALR）is a new type of multiphase reactor, which has a simple structure and good mixing mass transfer effect. It has been widely used in chemical engineering, bio-engineering and metallurgical industry etc. It has a very practical significance to develop a new type of high efficiency ALR. The ALR was simula- ted by CFD numerical simulation method. The gas-liquid flow numerical model was built base on the Euler-Euler two fluid approach to study the internal flow state. The simulation result were compared with the data from cold state experiment. The effects of different turbulence models and interphase forces on the simulation reliability are in- vestigated in the numerical simulation process, Base on the cold state experiments, the influence of different draft height on hydrodynamics of ALR are investigated by numerical simulation. The result shows that the two-dimen- sional CFD model can qualitatively show the gas holdup distribution inside the reactor. Lift force has a decisive influ- ence on the distribution of gas on radial. The flow state of numerical simulation and experimental result is more coin- cident by including lift model. The RNG can illustrates the fluctuation of gas holdup at high Reynolds number. Shorter draft height can obtain a higher overall gas holdup.

关 键 词：气升式环流反应器 数值模拟 湍流模型 相间作用力 导流筒 

分 类 号：TQ052[化学工程]