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Characterization of Char Gasification in a Micro Fluidized Bed Reaction Analyzer
Alternative TitleEnergy Fuels
Zeng, Xi1; Wang, Fang1,2; Wang, Yonggang2; Li, Aoming3; Yu, Jian1; Xu, Guangwen1
2014-03-01
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume28Issue:3Pages:1838-1845
AbstractThis 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.; 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.
KeywordGas-solid Reaction Co2 Gasification Biomass Char Thermogravimetric Analysis Pyrolysis Conditions Reaction-kinetics Carbon-dioxide Coal Chars Steam Temperatures
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ef402387r
URL查看原文
Indexed BySCI
Language英语
WOS KeywordGAS-SOLID REACTION ; CO2 GASIFICATION ; BIOMASS CHAR ; THERMOGRAVIMETRIC ANALYSIS ; PYROLYSIS CONDITIONS ; REACTION-KINETICS ; CARBON-DIOXIDE ; COAL CHARS ; STEAM ; TEMPERATURES
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000333381200027
Citation statistics
Cited Times:47[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8045
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
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.
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