高校化学工程学报2016，Vol.30Issue(6)：1284-1291,8.DOI:10.3969/j.issn.1003-9015.2016.06.007
短接触旋流反应器混合区内气固返混特性模拟研究
Modeling of Gas-Solid Back-Mixing in the Mixing Region of Short-Contact Cyclone Reactors
摘要
Abstract
Gas-solid two-phase flow in cyclone reactors was simulated with Euler-Euler model, and the gas-solid residence time distribution (RTD) in the mixing region was studied using species transport equation under no reaction mode. The cross-sectional back-mixing ratio (Rmix) was defined to quantify the gas and solid back-mixing in the mixing region of the reactor. The effects of entrance structure on the back-mixing of gas and solid were also investigated. The results show that the residence time of catalysts is shorter than that of gas. The back-mixing of gas is stronger than that of the catalysts, and the particle flow is close to plug flow. In the mixing region of the reactor, the Rmix values vary from 0 to 0.5, which increases first and then decreases with the increase of axial position. The back-mixing of gas becomes obvious in the mixing region when the guided vane is installed in the axial inlets. Comparing with reactors with upward and straight tangential inlets, the back-mixing of gas in the mixing region is weaker with downward tangential inlets, which indicates that reactors with downward tangential inlets are beneficial to the catalytic cracking reaction.关键词
旋流反应器/计算流体力学/停留时间分布/返混Key words
cyclone reactor/computational fluid dynamics (CFD)/residence time distribution/back-mixing分类
化学化工引用本文复制引用
王振波,朱丽云,黄峰,张玉春,金有海..短接触旋流反应器混合区内气固返混特性模拟研究[J].高校化学工程学报,2016,30(6):1284-1291,8.基金项目
国家自然科学基金(21276281)；重质油国家重点实验室开放基金(SKLOP200103008)。 （21276281）
