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CFD optimization of feedstock injection angle in a FCC riser
Chen, Sheng1,2; Fan, Yiping1; Yan, Zihan1; Wang, Wei2; Liu, Xinhua2; Lu, Chunxi1
2016-10-22
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume153Issue:OCTPages:58-74
AbstractFeedstock injection zone is a key section for fluid catalytic cracking (FCC) riser reactor. In conventional design of commercial FCC risers, the injection angle of the feedstock is 30 degrees upward with the riser axis, which is found to easily cause nonuniform oil-catalyst contact and severe back-mixing in the feedstock injection zone. In this work, the effect of feedstock injection angle is investigated by performing 3-D simulations with seven injection configurations including three inclined upward, one horizontally and three inclined downward. The two-fluid model (TFM) and the energy-minimization multi-scale (EMMS) drag is combined in simulations. Comparison with experimental data is conducted in terms of the profiles of solids and feed volume fractions. Several variables including the backflow ratio, the radial nonuniformity index and the mean residence time of feed, are further introduced to quantify the hydrodynamic dependence of flow and mixing on the injection settings. It is found that the downward injection schemes are better to realize uniform mixing and matching between catalysts and feed than the upward injection schemes. A 30 degrees downward injection angle is desired to improve the distributions of catalysts and feed, reduce the catalyst-feed contacting time and eliminate the effect of secondary flow on severe back-mixing near the riser wall. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordFluid Catalytic Cracking (Fcc) Feedstock Injection Zone Energy-minimization Multi-scale (Emms) Residence Time Distribution (Rtd) Computational Fluid Dynamics (Cfd)
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.ces.2016.07.003
Indexed BySCI
Language英语
WOS KeywordSOLID 2-PHASE FLOW ; CIRCULATING FLUIDIZED-BED ; FILTERED 2-FLUID MODELS ; GAS-PARTICLE FLOWS ; HEAVY OIL RISER ; NUMERICAL-SIMULATION ; EMMS MODEL ; CONSTITUTIVE RELATIONS ; CRACKING REACTION ; MULTIPHASE FLOW
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Key Basic Research Development Program of China (973 Program)(2012CB215000) ; National Natural Science Foundation of China(91334204)
WOS IDWOS:000381924900006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21290
Collection多相复杂系统国家重点实验室
Affiliation1.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Chen, Sheng,Fan, Yiping,Yan, Zihan,et al. CFD optimization of feedstock injection angle in a FCC riser[J]. CHEMICAL ENGINEERING SCIENCE,2016,153(OCT):58-74.
APA Chen, Sheng,Fan, Yiping,Yan, Zihan,Wang, Wei,Liu, Xinhua,&Lu, Chunxi.(2016).CFD optimization of feedstock injection angle in a FCC riser.CHEMICAL ENGINEERING SCIENCE,153(OCT),58-74.
MLA Chen, Sheng,et al."CFD optimization of feedstock injection angle in a FCC riser".CHEMICAL ENGINEERING SCIENCE 153.OCT(2016):58-74.
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