文献类型：期刊文献

英文题名：Incident Radiative Heat Flux Based Method for the Coupled Run Length Simulation of Steam Cracking Furnaces

作者：Zhang, Yu[1,2];Reyniers, Pieter A.[2];Du, Wenli[1];Qian, Feng[1];Van Geem, Kevin M.[2];Marin, Guy B.[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Univ Ghent, Lab Chem Technol, Technol Pk 914, B-9052 Ghent, Belgium

年份：2017

卷号：56

期号：14

起止页码：4156

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20172203720282);WOS:【SCI-EXPANDED(收录号:WOS:000399353900039)】；

基金：The computational resources and services used in this work were provided by the VSC (Flemish Supercomputer Center), funded by the Research Foundation Flanders (FWO) and the Flemish Government, department EWI. The financial support from the BOF Bilateral Scientific Cooperation (ECUST/LCT), the Long Term Structural Methusalem Funding by the Flemish Government, grant number BOF09/01M00409, and the China Scholarship Council (CSC) are acknowledged. This work is also supported by National Natural Science Foundation of China (Key Program: 61333010), National Natural Science Foundation of China (Major Program: 61590923), National Natural Science Foundation of China (61422303), and the 111 Project (B08021). P.A.R acknowledges financial support from a doctoral fellowship from the Fund for Scientific Research Flanders (FWO).

语种：英文

外文关键词：Computational fluid dynamics - Steam - Cracks - Furnaces - Heat flux - Coke - Costs - Steam cracking

摘要：Due to the significant economic penalty associated with decoking steam cracking furnaces, accurate run length predictions are crucial for assessing their technoeconomic performance. Therefore, for the first time, a full coupled run length simulation of an industrial naphtha steam cracking furnace was performed using detailed computational fluid dynamics (CFD) simulations for the furnace side. The results show that the unevenly deposited coke layer within the reactors leads to a redistribution of the thermal power over the time on stream, which is beneficial for the uniformity of the coke growth in the reactor. These effects were not observed in traditional standalone run length simulations, which justifies the high computational cost. However, the high computational cost of these CFD iterations can be overcome by using a novel method which correlates the incident radiative heat flux (IRHF) to the flue gas bridge-wall temperature obtained from an overall zero-dimensional heat balance. This so-called IRHF based method provides similar accuracy as the CFD coupled method but at a fraction of the computational cost. The CPU time was decreased by a factor of over 2000, allowing one to move these calculations from a high-performance computing environment to a personal computer. The generality of this method for changing operating conditions or feedstock compositions was also demonstrated by comparing with CFD coupled run length simulations of a set of new cases. With relative errors well below 1%, the IRHF based method is recommended for coupled run length simulations of steam cracking units.