A coupled CFD simulation approach for investigating the pyrolysis process in industrial naphtha thermal cracking furnaces  

作　　者：Mohsen Rezaeimanesh Ali Asghar Ghoreyshi S.M.Peyghambarzadeh Seyed Hassan Hashemabadi 

机构地区：[1]Chemical Engineering Department,Babol Noshirvani University of Technology,Shariati Ave.,47148-71167 Babol,Iran [2]Department of Chemical Engineering,Mahshahr Branch,Islamic Azad University,Mahshahr,Iran [3]Computational Fluid Dynamics(CFD)Research Laboratory,School of Chemical,Petroleum and Gas Engineering,Iran University of Science and Technology(IUST),Tehran,Iran

出　　处：《Chinese Journal of Chemical Engineering》2022年第4期528-542,共15页中国化学工程学报（英文版）

基　　金：the support of Bandar-eImam petrochemical company(BIPC),Iran。

摘　　要：In the steam thermal cracking of naphtha,the hydrocarbon stream flows inside tubular reactors and is exposed to flames of a series of burners in the firebox.In this paper,a full three-dimensional computational fluid dynamics(CFD)model was developed to investigate the process variables in the firebox and reactor coil of an industrial naphtha furnace.This comprehensive CFD model consists of a standard k-εturbulence model accompanied by a molecular kinetic reaction for cracking,detailed combustion model,and radiative properties.In order to improve the steam cracking performance,the model is solved using a proposed iterative algorithm.With respect to temperature,product yield and specially propylene-toethylene ratio(P/E),the simulation results agreed well with industrial data obtained from a mega olefin plant of a petrochemical complex.The deviation of P/E results from industrial data was less than 2%.The obtained velocity,temperature,and concentration profiles were used to investigate the residence time,coking rate,coke concentration,and some other findings.The coke concentration at coil exit was1.9×10^(-3)%(mass)and the residence time is calculated to be 0.29 s.The results can be used as a scientific guide for process engineers.

关 键 词：Naphtha thermal cracking CFD modeling Systems engineering Residence time Product yield 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ221.2[化学工程—有机化工]