CFD optimization of feedstock injection angle in a FCC riser

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	CFD optimization of feedstock injection angle in a FCC riser
	Chen, Sheng 1,2; Fan, Yiping 1; Yan, Zihan 1; Wang, Wei 2; Liu, Xinhua 2; Lu, Chunxi 1
刊名	CHEMICAL ENGINEERING SCIENCE
	2016-10-22
卷号	153 期号:OCT 页码:58-74
关键词	Fluid Catalytic Cracking (FCC) Feedstock injection zone Energy-Minimization Multi-Scale (EMMS) Residence Time Distribution (RTD) Computational Fluid Dynamics (CFD)
ISSN号	0009-2509
英文摘要	Feedstock 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.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	SOLID 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
收录类别	SCI
语种	英语
WOS记录号	WOS:000381924900006
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/21290]
专题	过程工程研究所_多相复杂系统国家重点实验室
作者单位	1.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
推荐引用方式 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.