乙烯裂解炉耦合模拟中湍流模型的影响分析  

Impact of turbulence model in coupled simulation of ethylene cracking furnace

作　　者：倪城振 杜文莉[1,2] 胡贵华 NI Chengzhen;DU Wenli;HU Guihua(School of Information Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;Key Laboratory of Advanced Process Control and Optimization Technology of Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学信息科学与工程学院,上海200237 [2]华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海200237

出　　处：《化工学报》2019年第2期450-459,I0005,共11页CIESC Journal

基　　金：国家杰出青年科学基金项目(61725301);国家自然科学基金重点项目(61333010);中央高校基本科研业务费资助(22221817014);上海市自然科学基金项目(17ZR1406800)

摘　　要：配备底部烧嘴和侧壁烧嘴的乙烯裂解炉应用越来越广泛,不同燃烧模式影响着炉膛内湍流流动状态,考虑到裂解炉中湍流流动与燃气喷料、燃烧和传热有较强的非线性耦合作用,为此探究不同湍流模型在裂解炉/反应器耦合模拟中的影响对于裂解炉的精确设计和优化至关重要。针对不同湍流模型对某十万吨工业乙烯裂解炉进行了耦合模拟,利用CFD数值模拟对采用标准k-ε模型、RNG k-ε和Realizable k-ε模型所建立的湍流流动模型进行评估。将三种湍流模型的模拟结果与工业数据进行比较,重点分析了裂解炉内的速度、温度、湍流能力等参数的分布情况,表明Realizable k-ε模型在火焰稳定性、反应效率等方面优于其他两种模型,且基于Realizable k-ε湍流方程的反应管模型在热通量、炉管外壁温度分布计算结果更接近实际工况。The ethylene cracking furnace equipped with the bottom burner and the side wall burner is more and more widely used.Different combustion modes affect the turbulent flow state in the furnace.Considering the turbulent flow in the cracking furnace and the gas injection,the combustion and heat transfer are strong.The nonlinear coupling effect,for this purpose,explores the influence of different turbulence models in the cracking furnace/reactor coupling simulation is critical for the precise design and optimization of the cracking furnace.In this paper,a coupling simulation for a 100000 t industrial ethylene cracking furnace was carried out for different turbulence models.The turbulent flow model established by the standard k-ε model,RNG k-ε and Realizable k-ε model was evaluated by CFD numerical simulation.The simulation results of the three turbulence models are compared with the industrial data.The distribution of velocity,temperature and turbulence capacity in the cracking furnace is analyzed.The results show that the Realizable k-ε model is superior to the other two models in flame stability and reaction efficiency.And based on the Realizable k-ε turbulence equation,the calculation results of the heat flux and the outer wall temperature distribution of the furnace tube are closer to the actual working conditions.

关 键 词：湍流 计算流体力学 数值模拟 乙烯裂解炉 反应器耦合 

分 类 号：TQ021.1[化学工程] TE963[石油与天然气工程—石油机械设备]