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Thermodynamic analysis and thermogravimetric investigation on chemical looping gasification of biomass char under different atmospheres with Fe2O3 oxygen carrier
Huang, Zhen1,2; He, Fang1; Zhu, Huangqing2; Chen, Dezhen2; Zhao, Kun1; Wei, Guoqiang1; Feng, Yipeng1; Zheng, Anqing1; Zhao, Zengli1; Li, Haibin1
2015-11-01
Source PublicationAPPLIED ENERGY
Volume157
AbstractChemical looping gasification (CLG) is viewed as a promising gasification technology because gas phase oxygen of gasifying medium can be replaced by lattice oxygen of oxygen carrier. In the present work, the reactivity of biomass char with Fe2O3 oxygen carrier under different atmospheres was detailed investigated through the thermodynamic and thermo-gravimetric analysis. The Fe2O3 was almost completely reduced into metallic iron when the reaction temperature exceeded 1000 degrees C, but the carbon conversion of char only attained to 40.80% due to the lack of oxygen source under inert atmosphere. However, the carbon conversion of char apparently increased and the oxygen conversion of oxygen carrier dramatically decreased under oxidizing atmosphere (CO2, or H2O). It is attributed to the fact that oxidizing agents can supply oxygen sources to promote char conversion as well as to alleviate the reduction of oxygen carrier. These thermodynamic predictions were confirmed by TGA tests, where the char was fully converted into gas under CO2, or H2O atmosphere because of enough oxygen sources but a low carbon conversion was obtained under inert atmosphere. TGA results further indicated that the reactivity of char with oxygen carrier under steam atmosphere is much higher than that under CO2 atmosphere and the Fe2O3 phase is mainly reduced into Fe3O4 phase in all the tests. Additionally, several other different carriers (Al2O3, NiO-modified iron ore and NiO) were employed to compare the reactivity of iron ore as well. The order of reactivity is speculated as follows: Pure oxygen approximate to NiO > H2O > Iron ore > CO2 > Al2O3. The reduced oxygen carrier can recover entire lattice oxygen [O] to its initial state under air atmosphere. Therefore, it suggests that the Fe2O3 material used as an oxygen carrier can be recycled in the process of char CLG. (C) 2015 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordThermodynamic Analysis Biomass Char Chemical Looping Gasification (Clg) Different Atmospheres Fe2o3
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.apenergy.2015.03.033
WOS Subject ExtendedEnergy & Fuels ; Engineering
WOS KeywordSYNTHESIS GAS-PRODUCTION ; FLUIDIZED-BED ; IRON-ORE ; STEAM GASIFICATION ; WOODY BIOMASS ; COMBUSTION ; COAL ; HYDROGEN ; REACTOR ; PERFORMANCE
Indexed BySCI
Language英语
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000364249200055
Citation statistics
Cited Times:36[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10889
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Chinese Acad Sci CAS Key Lab Renewable Energy, Guangzhou, Peoples R China
2.Tongji Univ, Thermal & Environm Engn Inst, Yangpu, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Huang, Zhen,He, Fang,Zhu, Huangqing,et al. Thermodynamic analysis and thermogravimetric investigation on chemical looping gasification of biomass char under different atmospheres with Fe2O3 oxygen carrier[J]. APPLIED ENERGY,2015,157.
APA Huang, Zhen.,He, Fang.,Zhu, Huangqing.,Chen, Dezhen.,Zhao, Kun.,...&Li, Haibin.(2015).Thermodynamic analysis and thermogravimetric investigation on chemical looping gasification of biomass char under different atmospheres with Fe2O3 oxygen carrier.APPLIED ENERGY,157.
MLA Huang, Zhen,et al."Thermodynamic analysis and thermogravimetric investigation on chemical looping gasification of biomass char under different atmospheres with Fe2O3 oxygen carrier".APPLIED ENERGY 157(2015).
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