加氢裂化空冷管束流动传热的耦合模拟  

Coupled simulation of flow and heat Transfer for hydrocracker's air coolers tubes

作　　者：偶国富[1,2] 曹晶[1] 谢浩平[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,浙江省杭州市310018 [2]杭州富如德科技有限公司,浙江省杭州市310018

出　　处：《炼油技术与工程》2010年第11期42-45,共4页Petroleum Refinery Engineering

基　　金：国家自然科学基金(50976106);浙江省自然科学基金重点项目(Z4080352)

摘　　要：为研究加氢裂化空冷管道内流动场和温度场分布规律,在流动传热耦合分析的基础上,结合高雷诺数k-ε湍流模型和热对流传导模型,采用有限元方法数值模拟空冷管道内湍流流动与对流传热过程。研究结果表明:管道壁面处存在速度边界层和温度边界层,有着较大的速度梯度和温度梯度;衬管后存在回流区域,最大回流长度为4.8 mm;流体温度随管道长度呈近线性递减趋势,在同一截面处流体温差较小;流体出口温度随管径减小而减小,随流速的增大而增大。To study the flow field and temperature field distribution in hydrocracker＇ s air cooler tubes,the turbulent flow and heat transfer process were simulated by finite element method on the basis of coupled analysis of turbulent flow and heat transfer and application of k-εturbulence and convection conduction models.The results indicated that the boundary layer exists beside the tube wall,where the velocity and temperature gradients are large.There is a reflux region behind the liner,with the maximum reflux length of 4.8 mm.The temperature of fluid is decreasing in nearly linear trend as it flows.In the same section,the fluid temperature difference is small.The outlet temperature of fluid is decreasing with decreasing tube diameter or flow rate.

关 键 词：空冷器 湍流流动 对流传热 边界层 耦合 

分 类 号：TK124[动力工程及工程热物理—工程热物理]