CFD simulation of gas-solid two-phase flow and mixing in a FCC riser with feedstock injection

被引：43

作者：

Chen, Sheng ^{[1
,2
]}

Fan, Yiping ^{[1
]}

Yan, Zihan ^{[1
]}

Wang, Wei ^{[2
]}

Lu, Chunxi ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil, Beijing 102249, Peoples R China

[2] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China

来源：

POWDER TECHNOLOGY | 2016年 / 287卷

基金：

中国国家自然科学基金;

关键词：

Fluid Catalytic Cracking (FCC); Feedstock injection scheme; Nozzle; EMMS; Secondary flow; Computational Fluid Dynamics (CFD); CIRCULATING FLUIDIZED-BED; SECONDARY AIR INJECTION; FILTERED 2-FLUID MODELS; NUMERICAL-SIMULATION; PARTICLE FLOWS; MULTISCALE CFD; EMMS; HYDRODYNAMICS; DEACTIVATION; CRACKING;

D O I：

10.1016/j.powtec.2015.09.005

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The feedstock injection zone is a key section for Fluid Catalytic Cracking riser reactor. A 3-D Computational Fluid Dynamics simulation is performed by coupling the two-fluid model and the energy-minimization multi-scale (EMMS) drag. The prediction agrees well with the available data and the secondary flow phenomenon is captured. The simulation reveals that the M-shape distributed feed sprays interact with the W-shape distributed solid particles and then cause the undesirable W-shape distribution of the matching ratio of catalysts to feed. The transformation of such uneven distribution to the finally core-annular distribution heavily depends on the secondary flow, whereas its mechanism can be explained by using the Kutta-joukowski lift theorem. The increase of the feed spray velocity facilitates the feed diffusion and reduces the transition region. However, excessively high jet velocity may intensify the back-mixing near the wall and causes intense attrition or breakage of catalysts and thereby an increase of costs. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：29 / 42

页数：14

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