文献类型：期刊文献

英文题名：Turbulent mixing enhancement of thermal cracking coil by Hollow Cross Disk internal

作者：Bai, Dehong[1];Zong, Yuan[1];Zhou, Minmin[2];Zhao, Ling[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai, Peoples R China;[2]Univ Utah, Inst Clean & Secure Energy, Salt Lake City, UT USA

年份：2020

卷号：147

外文期刊名：CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION

收录：;EI(收录号：20194807737564);WOS:【SCI-EXPANDED(收录号:WOS:000510014600010)】；

基金：This research is supported by the National Basic Research Program of China (2012CB720501).

语种：英文

外文关键词：Cracking process intensification; Meso- and micro-; Mixing enhancement; Coking suppression; Flow field reconstruction

摘要：The Hollow Cross Disk (HCD) internal is designed to enhance the meso- and micro-mixing performance of thermal cracking process to suppress coking as well as optimize product distribution. Combined research methods of cracking experiment and computational fluid dynamics (CFD) are used to investigate the strengthening effect of the novel internal. The naphtha cracking experiment result shows that HCD internal can improve the overall olefin yield by 0.95% and reduce the production of coke by 4.67% comparing with bare coil. Contrast CFD simulations of propane pyrolysis in industrial scale cracking coil are conducted to reveal the specific enhancing character of the designed internal. Comparing with bare coil (Case A), coil with HCD internal (Case B) can improve the Nu and Sh by 4.59% and 0.82% respectively, reducing the skin temperature of the cracking coil by 21.76k. As HCD internal can induce radial velocity component to enhance radial mixing in the coil wall vicinity, intensifying turbulence to accelerate fluid in the near wall region to reduce the average residence time, which is beneficial to relieve coking. In addition, the intensified turbulence leads the overall characteristic micro-mixing time of Case B reduced to 1.96% of the bare coil. The enhanced micro-mixing can improve the overall olefin yield by 2.97% as the molecular scale uniform reactive region is expanded by 0.58% for Case B.