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Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process
Alternative TitleEnergy Fuels
Zeng, Xi1; Wang, Yin1; Yu, Jian1; Wu, Shisheng2; Zhong, Mei1; Xu, Shaoping2; Xu, Guangwen1
2011-03-01
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume25Issue:3Pages:1092-1098
AbstractCoal pyrolysis is generally performed in atmospheres without oxygen and at temperatures below 650 degrees C for producing pyrolysis liquid and gas. To support the development of a new two-stage gasification process integrating a fluidized-bed pyrolysis and a downdraft fixed-bed gasifier, this paper investigated the Coal pyrolysis in atmospheres containing oxygen and steam and at temperatures up to 900 degrees C to understand the viable pyrolysis conditions in view of process adaptation. The examined pyrolysis characteristics include the product distribution, char gasification reactivity, and tar composition The pyrolysis gas yield, especially the yields of H(2) and CO, increased with elevating the temperature and mass ratio of steam/coal (S/C). Additing O(2) to the reaction atmosphere promoted the formation of CO and CO(2) but decreased that of H(2). the inclusion of O(2) and steam in the atmosphere resulted in chars with a larger surface area and more micropores. At 900 degrees C in N(2) atmosphere or at 850 degrees C with oxygen in the atmosphere (e.g.; at an excessive air ratio of 0.22), graphitization was observed in the produced char, which lowered the char gasification reactivity. Analyzing the produced tar via thermogravimetry,coupled with Fourier, transform infrared (TG-FTIR) spectroscopy clarified that the presence of steam significantly affected the tar composition by leading to more aliphatic hydrocarbons and lowering the contents of single-ring aromatics, phenols, and ketonic species. Thus, the pyrolysis gas product from a steamcontaining reaction atmosphere would be easier to crack and be reformed in the downstream char gasifier.; Coal pyrolysis is generally performed in atmospheres without oxygen and at temperatures below 650 degrees C for producing pyrolysis liquid and gas. To support the development of a new two-stage gasification process integrating a fluidized-bed pyrolysis and a downdraft fixed-bed gasifier, this paper investigated the Coal pyrolysis in atmospheres containing oxygen and steam and at temperatures up to 900 degrees C to understand the viable pyrolysis conditions in view of process adaptation. The examined pyrolysis characteristics include the product distribution, char gasification reactivity, and tar composition The pyrolysis gas yield, especially the yields of H(2) and CO, increased with elevating the temperature and mass ratio of steam/coal (S/C). Additing O(2) to the reaction atmosphere promoted the formation of CO and CO(2) but decreased that of H(2). the inclusion of O(2) and steam in the atmosphere resulted in chars with a larger surface area and more micropores. At 900 degrees C in N(2) atmosphere or at 850 degrees C with oxygen in the atmosphere (e.g.; at an excessive air ratio of 0.22), graphitization was observed in the produced char, which lowered the char gasification reactivity. Analyzing the produced tar via thermogravimetry,coupled with Fourier, transform infrared (TG-FTIR) spectroscopy clarified that the presence of steam significantly affected the tar composition by leading to more aliphatic hydrocarbons and lowering the contents of single-ring aromatics, phenols, and ketonic species. Thus, the pyrolysis gas product from a steamcontaining reaction atmosphere would be easier to crack and be reformed in the downstream char gasifier.
KeywordDried Sewage-sludge Pore Structure Reactivity Gasifier Reactor Chars Tar System Temperatures Morphology
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ef101441j
URL查看原文
Indexed BySCI
Language英语
WOS KeywordDRIED SEWAGE-SLUDGE ; PORE STRUCTURE ; REACTIVITY ; GASIFIER ; REACTOR ; CHARS ; TAR ; SYSTEM ; TEMPERATURES ; MORPHOLOGY
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000289613300028
Citation statistics
Cited Times:38[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6280
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.Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Dalian 116012, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Xi,Wang, Yin,Yu, Jian,et al. Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process[J]. ENERGY & FUELS,2011,25(3):1092-1098.
APA Zeng, Xi.,Wang, Yin.,Yu, Jian.,Wu, Shisheng.,Zhong, Mei.,...&Xu, Guangwen.(2011).Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process.ENERGY & FUELS,25(3),1092-1098.
MLA Zeng, Xi,et al."Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process".ENERGY & FUELS 25.3(2011):1092-1098.
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