文献类型：期刊文献

英文题名：Analytical models for heat transfer in the tube bundle of convection section in a steam cracking furnace

作者：Yuan, Benfeng[1]; Zhang, Yu[1]; Hu, Guihua[1]; Zhong, Weimin[1]; Qian, Feng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Control & Optimizat Chem Proc, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：163

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20193807453563);WOS:【SCI-EXPANDED(收录号:WOS:000498306600050)】；

基金：This work was partially supported by the National Natural Science Foundation of China (61590923), Optimal Short-term Operation of Petroleum Refineries International (Regional) Cooperation and Exchange Project (61720106008), National Natural Science Fund for Distinguished Young Scholars (61725301) and Fundamental Research Funds for Central Universities, China Postdoctoral Science Foundation (2017M621388), Shanghai Sailing Program (19YF1412200, 19YF1412300).

语种：英文

外文关键词：Convection section; Tube bundle; Heat transfer analysis; Computational fluid dynamics; Convective heat transfer; Radiative heat transfer

摘要：In steam cracking furnaces, about 45% of the heat released from fuel combustion is recovered by preheating cracking feedstock and high pressure steam. This is achieved mainly by indirect convective heat transfer from flue gas to feedstock and steam in a series of tube bundles located in the so-called convection section. Radiation also plays in an important role in lower bundles where flue gas temperature is high. Thus, accurate heat transfer simulation of the convection section is crucial for operation optimization and control of steam cracking furnace. This paper aims to develop a heat transfer analysis (HTA) model for combined convective and radiative heat transfer calculation in tube bundles with both inline and staggered layouts. Computational fluid dynamics (CFD) was employed to validate the HTA model in the first stage. Based on the HTA model, coupled steady-state simulations of the convection section were performed for an industrial steam cracking furnace with naphtha feed capacity of 30 t/h. The predictions of the HTA model are in good agreement with the design data. The study shows that convective heat transfer is significantly enhance by fins in the tube bundles where the flue gas temperatures are too low to effectively heat up the feedstock. Radiative heat transfer at the bottom of the convection chamber is much larger than the convective heat transfer and thus cannot be ignored in heat transfer calculation.