文献类型：期刊文献

英文题名：Experimental study on gas-solid two-phase flow behavior in a novel expanded diameter structure fluidized bed catalytic cracking reactor

作者：Wang, Jingxiao[1];Shen, Zhongjie[1];Xu, Jianliang[1];Gong, Jianhong[2];Liu, Haifeng[1,3]

机构：[1]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, POB 272, Shanghai 200237, Peoples R China;[2]Sinopec, Res Inst Petr Proc Co Ltd, Beijing 100083, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2025

卷号：317

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20252518634257);WOS:【SCI-EXPANDED(收录号:WOS:001514361400003)】；

基金：This study is supported by the SINOPEC, China "Ten Dragons" research program (118028) .

语种：英文

外文关键词：Circulating fluidized bed; Expanded diameter; Riser; Gas-solid two-phase flow; Back mixing

摘要：The escalating reliance on heavier crude oils necessitates catalytic cracking technologies adaptable to increasingly inferior feedstocks. This study compared gas-solid flow behaviors between a novel RTC (Residue to Chemicals) reactor and a conventional riser using localized solids concentration and velocity measurements. The expanded section of novel RTC reactor increased solids concentration, notably near-wall region, and radial velocity gradients while reducing superficial gas velocity. Structural expansion-contraction induced particle recirculation via upward central flow and downward near-wall reflux. Elevated gas flow rate transformed the axial solids concentration profile from an S-shaped to an exponential distribution, intensifying radial velocity nonuniformity and back mixing while expanding near-wall back mixing zones. However, increased particle flux enhanced both axial and radial solids concentrations, whereas velocity distribution patterns remained largely unaffected. These findings enhance the fundamental understanding of gas-solid flow mechanisms in catalytic cracking reactors and offer practical insights for optimizing reactor design to improve light olefin yields and feedstock adaptability in heavy oil upgrading.