Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD-DEM study

	Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD-DEM study
	Zhang, Yuli 1,2; Ye, Mao 2; Zhao, Yinfeng 2; Gu, Tong 3; Xiao, Rui 1; Liu, Zhongmin 2
刊名	powder technology
	2015-05-01
卷号	275 页码:199-210
关键词	Fluidized bed Methanation CFD-DEM Fluidization quality High pressure
英文摘要	in fluidized bed methanation reactors, gas volumetric flow reduction due to the reaction can cause serious problems for fluidization quality, and in extreme cases, unwanted defluidization may occur. note that the fluidization quality is closely linked to the expansion of emulsion phase, this paper present a numerical study on the emulsion phase expansion of geldart a type of particles in fluidized bed methanation reactors by use of the well-established cfd-dem model. the effects of operation conditions such as reaction rate, superficial gas velocity, pressure and bed inventory are discussed and compared qualitatively with experiments in literature. it is found that a higher gas velocity, based on the reactant gas at the inlet, is required to fully fluidize the particles and maintain good fluidization quality in a methanation reactor. fast bubbles, considered as an important feature in the fluidization of geldart a type of particles, were observed. close check shows that the gas circulation around fast bubbles is responsible for the worsened gas exchange between gas bubbles and emulsion phase and consequently the apparent contraction of emulsion phase for geldart a type of particles. higher pressure and lower bed height can improve emulsion phase expansion in the methanation fluidized bed reactors, which is in accordance with previous experimental findings. the superficial gas velocity affects the emulsion phase expansion in a complicated way, where two mechanisms, i.e., large bubble size and short gas residence time, will work together. (c) 2015 elsevier b.v. 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]	gas-solid fluidization ; fine particles ; size distribution ; numerical-model ; catalyst beds ; mass-transfer ; a particles ; behavior ; simulation ; pressure
收录类别	SCI
语种	英语
WOS记录号	WOS:000351801300022
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/146111]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Southeast Univ, Sch Energy & Environmen, Nanjing 210096, Jiangsu, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Engn Lab MTO, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China 3.BP Energy Innovat Lab, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yuli,Ye, Mao,Zhao, Yinfeng,et al. Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD-DEM study[J]. powder technology,2015,275:199-210.
APA	Zhang, Yuli,Ye, Mao,Zhao, Yinfeng,Gu, Tong,Xiao, Rui,&Liu, Zhongmin.(2015).Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD-DEM study.powder technology,275,199-210.
MLA	Zhang, Yuli,et al."Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD-DEM study".powder technology 275(2015):199-210.