文献类型：期刊文献

英文题名：Novel cracking coil design based on positive constructing of synergetic flowing field

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：2019

卷号：129

起止页码：783

外文期刊名：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

收录：;EI(收录号：20184105937636);WOS:【SCI-EXPANDED(收录号:WOS:000453113500066)】；

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

语种：英文

外文关键词：Cracking coil; Heat and mass transfer enhancement; Field synergy improvement

摘要：A novel insert-hollow cross disk (HCD) combined with twisted tape is embedded in a cracking coil to enhance the propane cracking process by positive constructing of synergetic flowing field. Quantitative analysis of appropriate insert arrangement has been conducted based on contrastive CFD simulation results in the bare and novel coil. The characteristic exchanging flow between the central zone and the near wall area induced by inserts in the novel coil can play an effective role in improving the radial synergy among heat, mass and velocity. This leads to an obvious yield increase of 0.50% and 10.23% of ethylene and propylene comparing with the bare coil. And the average tube skin temperature is declined by 28.45 k. Moreover, the Nu and Sh are increased by 10.96% and 2.98% respectively and the overall PEC factor has a rise of 8.00% in the novel coil. This confirms the effective strengthening effect by the novel coil. Furthermore, the field synergy theory is applied to evaluate the synergy improvement for the heat and mass transfer process. Comparing with the bare coil, the synergy angles for heat as well as mass transfer in the novel coil have a maximum decrease of 21.76% and 23.14% in the downstream of the twisted tape (z/L = 0.23) and HCD insert (z/L = 0.60), respectively. This could explain the enhanced heat and mass transfer as well as the product distribution due to the synergic flow field in the novel coil with the assemble inserts group. (C) 2018 Elsevier Ltd. All rights reserved.