考虑汽化影响的乙烯裂解炉对流段数值模拟  

Numerical Simulation of Convection Section of Ethylene Cracking Furnace Considering Evaporation Effect

作　　者：胡贵华 隆建 杜文莉 HU Guihua;LONG Jian;DU Wenli(Key Laboratory of Advanced Control and Optimization for Chemical Processes,Ministry of Education,School of Information Science and Engineering,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化工过程先进控制和优化技术教育部重点实验室

出　　处：《华东理工大学学报（自然科学版）》2019年第5期719-727,共9页Journal of East China University of Science and Technology

基　　金：国家自然科学基金重点项目(61333010);国家自然科学基金青年基金(21506050);国家杰出青年科学基金(61725301);上海市自然科学基金(17ZR1406800);中央高校基本科研业务费重点科研基地创新基金(222201717006,22221817014)

摘　　要：在考虑原料蒸发段汽化影响的情况下,采用Flunt软件对某一次注气乙烯裂解炉对流段进行了数值模拟。对对流室和不同炉管段分别进行建模,模拟结果与工业数据一致。模拟结果表明:对流室底部与横跨段90°拐角处存在回流区,不利于裂解炉的长周期运行;考虑原料蒸发段汽化影响的耦合计算结果更加准确;炉管吸热量受炉管位置的影响,不同炉管的管壁温度和出口油气温度不同。模拟结果对裂解炉的设计和操作优化具有参考意义。Under the consideration of the effect of evaporation of the vaporizer,this paper utilizes the computational fluid dynamics (CFD) software,fluent,to numerically simulate the convection section of an ethylene cracking furnace.Moreover,the modeling of convection chamber and different tube sections are made,respectively,in which the flow of flue gas and oil gas adopts the standard k-ε turbulence model,the two-phase flow in the vaporizer adopts the volume of fluid (VOF) model,and the radiation heat transfer and the multi- components in the convection chamber adopt the discrete ordinates (DO) model and the species transport model,respectively.The simulation results are in agreement with the industrial data.And then,the heat transfer and flow in the convection section are analyzed.It is shown via these results that there exist two recirculation zones at the bottom of the convection chamber and the 90 degree corner of the cross section,which results in the residence time of the high temperature flue gas to increase here and yield a hot spot at the bottom of the mixture heater.This is not conducive to the long period operation of the cracking furnace.The results of the coupled calculation under the consideration of evaporation effect of the vaporizer will be more accurate.The heat absorption of the tubes is influenced by the position of the tubes,and the temperatures of tube skin and the oil gas at outlet in different tubes are different.These simulation results have reference significance for the design and operation optimization of the cracking furnace.

关 键 词：原料蒸发段 汽化 计算流体力学 乙烯裂解炉 对流段 

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