文献类型：期刊文献

英文题名：Coupled simulation of convection section with dual stage steam feed mixing of an industrial ethylene cracking furnace

作者：Hu, Guihua[1];Yuan, Benfeng[1];Zhang, Liang[1];Li, Jinlong[1];Du, Wenlin[1];Qian, Feng[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Adv Control & Optimizat Chem Proc, Shanghai 200237, Peoples R China

年份：2016

卷号：286

起止页码：436

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20154701572748);WOS:【SCI-EXPANDED(收录号:WOS:000366790000049)】；

基金：This work is supported by Major State Basic Research Development Program of China (2012CB720500) and National Natural Science Foundation of China - China (Key Program: U1162202).

语种：英文

外文关键词：Coupled simulation; Convection section; Dual stage steam feed mixing; Cracking furnace; Computational fluid dynamics; Evaporation

摘要：A complete coupled simulation of the convection chamber and tubes with dual stage steam feed mixing of an industrial ethylene cracking furnace has been carried out with the computational fluid dynamics (CFD) method for the first time. In the convection chamber, the standard k-epsilon model and discrete ordinates (DO) radiation model were respectively used in the descriptions of turbulence characteristics and radiative heat transfer. In the tubes, renormalization group (RNG) k-epsilon model and volume of fluid (VOF) model were respectively applied to the turbulence flow and the liquid-vapor two phases flow. Simulation results agree well with the industrial data. Based on the coupled result, a dynamic simulation was calculated in the feedstock preheater (FPH). Simulation results show that the velocity and temperature fields are inhomogeneous distributions along the width direction due to the asymmetrical structure of convection chamber. Two recirculation zones occur at the corner both near and away from the entrance to the convection chamber, which will cause a longer residence time of flue gas and local overheating in furnace wall of convection chamber. The process gas temperature, tube skin temperature and heat flux profiles are respectively different along the axial and radial direction of the high temperature coil (HTC-I). The changes of flow pattern from bubble flow to spray flow are effected by gravity and centrifugal force during evaporation. The results will be helpful for the design and operation in cracking furnace. (C) 2015 Elsevier B.V. All rights reserved.