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Biomass Char Direct Chemical Looping Gasification Using NiO-Modified Iron Ore as an Oxygen Carrier
Huang, Zhen; He, Fang; Feng, Yipeng; Zhao, Kun; Zheng, Anqing; Chang, Sheng; Wei, Guoqiang; Zhao, Zengli; Li, Haibin
2014
Source PublicationENERGY & FUELS
Volume28Issue:1Pages:183-191
AbstractChemical looping gasification (CLG) is considered as a novel gasification technology because gas-phase oxygen of the gasifying medium can be replaced by lattice oxygen of the oxygen carrier. The gasifying mediums (e.g., pure O-2 and steam) used as the oxygen source can apparently improve the char conversion in traditionally biomass gasification. Similarly, the objective of this study is to investigate char CLG with the oxygen carrier as an individual oxygen source. A NiO-modified iron ore oxygen carrier was prepared by the impregnation method coupled with ultrasonic treatment. The characteristics of the oxygen carrier were analyzed by an X-ray diffractometer (XRD) and H-2 temperature-programmed reduction (H-2-TPR). The formation of spinel-type nickel iron oxide NiFe2O4 can evidently enhance the reactivity of the oxygen carrier. The reduction of the oxygen carrier by biomass char was investigated using thermogravimetric analysis (TGA) together with a fixed-bed reactor under an inert atmosphere. TGA tests show that the reactivity of the oxygen carrier increased with the increase of NiO loading. An optimal mass ratio of char/oxygen carrier is determined at 4:6 With the aim of obtaining a maximum reaction rate. The presence of spinel-type nickel iron oxide NiFe2O4 apparently improved the reaction rate of char gasification. The fixed-bed gasification results show that CO was generated faster than other components because carbon was partially oxidized and H-2 was quickly consumed by the lattice oxygen [O] of the oxygen carrier. A relatively high carbon conversion of 55.56% was obtained in the char CLG, in comparison to that of char pyrolysis (5.52%). The lattice oxygen [O] of the oxygen carrier was fully consumed by biomass char. Moreover, biomass char was catalytically, pyrolyzed becausee the deep reduction products (metallic iron and nickel) can act as catalysts for char pyrolysis. XRD analysis shows that the oxygen carrier was deeply reduced into Fe (Ni) alloy and Fe3C species during the reduction stage of Char CLG. However, the. regenerated oxygen carrier after oxidation can be recycled for char CLG on the basis of XRD and scanning electron microscopy (SEM) analyses.
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ef401528k
WOS Subject ExtendedEnergy & Fuels ; Engineering
WOS KeywordSYNTHESIS GAS-PRODUCTION ; FLUIDIZED-BED REACTOR ; HYDROGEN REDUCTION ; NATURAL HEMATITE ; COMBUSTION ; COAL ; OXIDE ; KINETICS ; METHANE ; STEAM
Indexed BySCI
Language英语
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000330018200020
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10672
Collection中国科学院广州能源研究所
AffiliationChinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Huang, Zhen,He, Fang,Feng, Yipeng,et al. Biomass Char Direct Chemical Looping Gasification Using NiO-Modified Iron Ore as an Oxygen Carrier[J]. ENERGY & FUELS,2014,28(1):183-191.
APA Huang, Zhen.,He, Fang.,Feng, Yipeng.,Zhao, Kun.,Zheng, Anqing.,...&Li, Haibin.(2014).Biomass Char Direct Chemical Looping Gasification Using NiO-Modified Iron Ore as an Oxygen Carrier.ENERGY & FUELS,28(1),183-191.
MLA Huang, Zhen,et al."Biomass Char Direct Chemical Looping Gasification Using NiO-Modified Iron Ore as an Oxygen Carrier".ENERGY & FUELS 28.1(2014):183-191.
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