Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets

doi:10.1016/j.partic.2019.09.007

	Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets
	Meng, Zhenliang 1,2; Liu, Mengxi 1; Ahmad, Nouman 2; Wang, Wei 2,3; Lu, Chunxi 1
刊名	PARTICUOLOGY
	2020-08-01
卷号	51 页码:120-131
关键词	Internally circulating fluidized bed Downcomer outlet EMMS CFD Particles flow
ISSN号	1674-2001
DOI	10.1016/j.partic.2019.09.007
英文摘要	Standpipes, or downcomers, are commonly used in fluidized beds to transport particles. The outlet structure of the downcomer greatly affects the performance of flow from it and even overall reactor performance. In this study, the hydrodynamics in commercial-scale internally circulating fluidized beds( ICFBs) with central downcomers having different outlet structures was investigated using computational fluid dynamics simulations with an energy minimization multi-scale drag model. The predicted results closely agreed with experimental data. Results showed that in an ICFB with a downcomer outlet directly open to the bed (model A), nearly 12.7% to 5.4% of the gas in the draft tube bypasses into the downcomer. In the ICFB models B and C with a conic baffle below the downcomer, the gas bypass is significantly weakened or even eliminated when the diameter of the conic baffle is 1.1 times that of the downcomer (model C). In addition, the solids circulation mass flux in ICFBs increased by about 62.5%, from 126.8 kg/(m(2)s) in model A to 206 kg/(m(2)s) in model C. (C) 2019 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.
资助项目	National Natural Science Foundation of China[91534111] ; National Natural Science Foundation of China[91834302] ; National Natural Science Foundation of China[91834303] ; National Natural Science Foundation of China[21625605] ; National Key Basic Research Project (Program 973) of China[2012CB215000]
WOS关键词	GAS-PARTICLE FLOW ; CYCLONE DIPLEGS ; MIXING CHARACTERISTICS ; SOLID FLOW ; LOOP-SEAL ; L-VALVE ; SIMULATION ; STANDPIPE ; BEHAVIOR ; OPERATION
WOS研究方向	Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000524974900013
资助机构	National Natural Science Foundation of China ; National Key Basic Research Project (Program 973) of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/40080]
专题	中国科学院过程工程研究所
通讯作者	Liu, Mengxi; Wang, Wei
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 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Meng, Zhenliang,Liu, Mengxi,Ahmad, Nouman,et al. Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets[J]. PARTICUOLOGY,2020,51:120-131.
APA	Meng, Zhenliang,Liu, Mengxi,Ahmad, Nouman,Wang, Wei,&Lu, Chunxi.(2020).Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets.PARTICUOLOGY,51,120-131.
MLA	Meng, Zhenliang,et al."Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets".PARTICUOLOGY 51(2020):120-131.