Investigation of gas-solids flow characteristics in a circulating fluidized bed with annular combustion chamber by pressure measurements and CPFD simulation

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	Investigation of gas-solids flow characteristics in a circulating fluidized bed with annular combustion chamber by pressure measurements and CPFD simulation
	Qiu, Guizhi 1,2; Ye, Jiamin 1; Wang, Haigang 1
刊名	CHEMICAL ENGINEERING SCIENCE
	2015-09-29
卷号	134 页码:433-447
关键词	Circulating fluidized bed Flow regimes Pressure CPFD simulation Non-uniformity Power spectrum
英文摘要	For large scale circulating fluidized bed (CFB) boilers, a new type of annular combustion chamber was proposed to improve the secondary air penetration and provide adequate space to arrange the heat transfer surface. To investigate the gas-solids flow characteristics and optimize the structure of the annular combustion chamber, a "cold" test rig was built with a cross sectional area of 1.18 m(2) and a height of 8.0 m. High frequency pressure transducers were used to obtain the pressure fluctuations characteristics. CFD simulation based on computational particle fluid dynamic (CPFD) was used to obtain pressure fluctuations and particles concentration. The time domain analysis, power spectrum analysis and Hilbert-Huang transform were applied to the experimental and simulation data. Different flow regimes including single bubble regime, exploding bubble regime and turbulent fluidization regime were identified. The flow characteristics were investigated in terms of standard deviation and higher-order moments, auto-correlation, power spectrum, and EMD energy entropy. The results show that the gas-solids flow in the bottom region of the annular combustion chamber was relatively uniform. The gas-solids flow in annular combustion chamber was proved similar to that in a conventional CFB riser. (C) 2015 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]	HILBERT-HUANG TRANSFORM ; EXTERNAL HEAT-EXCHANGER ; TIME-SERIES ANALYSIS ; REGIMES ; HYDRODYNAMICS ; IDENTIFICATION ; DECOMPOSITION ; FLUCTUATIONS ; DISTRIBUTOR ; BOILER
收录类别	SCI
语种	英语
WOS记录号	WOS:000359029200041
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/98925]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qiu, Guizhi,Ye, Jiamin,Wang, Haigang. Investigation of gas-solids flow characteristics in a circulating fluidized bed with annular combustion chamber by pressure measurements and CPFD simulation[J]. CHEMICAL ENGINEERING SCIENCE,2015,134:433-447.
APA	Qiu, Guizhi,Ye, Jiamin,&Wang, Haigang.(2015).Investigation of gas-solids flow characteristics in a circulating fluidized bed with annular combustion chamber by pressure measurements and CPFD simulation.CHEMICAL ENGINEERING SCIENCE,134,433-447.
MLA	Qiu, Guizhi,et al."Investigation of gas-solids flow characteristics in a circulating fluidized bed with annular combustion chamber by pressure measurements and CPFD simulation".CHEMICAL ENGINEERING SCIENCE 134(2015):433-447.