Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer

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	Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer
	Zeng, Xi 1; Wang, Fang 1,2; Wang, Yonggang 2; Li, Aoming 3; Yu, Jian 1; Xu, Guangwen 1
刊名	ENERGY & FUELS
	2014-03-01
卷号	28 期号:3 页码:1838-1845
关键词	gas-solid reaction co2 gasification biomass char thermogravimetric analysis pyrolysis conditions reaction-kinetics carbon-dioxide coal chars steam temperatures
ISSN号	0887-0624
其他题名	Energy Fuels
中文摘要	This study is devoted to characterizing the isothermal reaction kinetics of char gasification with CO2 in a micro fluidized bed reaction analyzer (MFBRA) in comparison to the measurement in a thermogravimetric analyzer (TGA). Under minimized inhibition of heat and mass transfer, the reaction rate was found to be much higher in the MFBRA than in the TGA. The maximal rate appeared at a conversion of about 0.15 in the MFBRA but at 0.45 in the TGA. The shrinking core model described well the char-CO2 gasification reaction in both the MFBRA and TGA. In the temperature range of 760-1000 degrees C, the char-CO2 gasification reaction can be divided into two stages. At lower temperatures, the activation energy from the MFBRA and TGA is very close, validating the reliability of the MFBRA for analyzing gas-solid reaction kinetics. At higher temperatures, the estimated activation energy was obviously higher for the MFBRA than for the TGA, showing the lower diffusion limitation prevailing in the MFBRA. The frequency factor for the Arrhenius equation was found to be much higher for the MFBRA than for the TGA, complying with the higher reaction rate observed in the MFBRA. The variation in the reaction atmosphere composition during gas switching in the TGA was also investigated.
英文摘要	This study is devoted to characterizing the isothermal reaction kinetics of char gasification with CO2 in a micro fluidized bed reaction analyzer (MFBRA) in comparison to the measurement in a thermogravimetric analyzer (TGA). Under minimized inhibition of heat and mass transfer, the reaction rate was found to be much higher in the MFBRA than in the TGA. The maximal rate appeared at a conversion of about 0.15 in the MFBRA but at 0.45 in the TGA. The shrinking core model described well the char-CO2 gasification reaction in both the MFBRA and TGA. In the temperature range of 760-1000 degrees C, the char-CO2 gasification reaction can be divided into two stages. At lower temperatures, the activation energy from the MFBRA and TGA is very close, validating the reliability of the MFBRA for analyzing gas-solid reaction kinetics. At higher temperatures, the estimated activation energy was obviously higher for the MFBRA than for the TGA, showing the lower diffusion limitation prevailing in the MFBRA. The frequency factor for the Arrhenius equation was found to be much higher for the MFBRA than for the TGA, complying with the higher reaction rate observed in the MFBRA. The variation in the reaction atmosphere composition during gas switching in the TGA was also investigated.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Energy & Fuels ; Engineering, Chemical
研究领域[WOS]	Energy & Fuels ; Engineering
关键词[WOS]	GAS-SOLID REACTION ; CO2 GASIFICATION ; BIOMASS CHAR ; THERMOGRAVIMETRIC ANALYSIS ; PYROLYSIS CONDITIONS ; REACTION-KINETICS ; CARBON-DIOXIDE ; COAL CHARS ; STEAM ; TEMPERATURES
收录类别	SCI
原文出处	://WOS:000333381200027
语种	英语
WOS记录号	WOS:000333381200027
公开日期	2014-05-06
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/8045]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China 3.Shanghai Amtek Ind Equipment Ltd Co, Shanghai 200131, Peoples R China
推荐引用方式 GB/T 7714	Zeng, Xi,Wang, Fang,Wang, Yonggang,et al. Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer[J]. ENERGY & FUELS,2014,28(3):1838-1845.
APA	Zeng, Xi,Wang, Fang,Wang, Yonggang,Li, Aoming,Yu, Jian,&Xu, Guangwen.(2014).Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer.ENERGY & FUELS,28(3),1838-1845.
MLA	Zeng, Xi,et al."Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer".ENERGY & FUELS 28.3(2014):1838-1845.