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Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas
Chen, Zhaohui1,2; Li, Yunjia1; Lai, Dengguo3; Geng, Sulong1; Zhou, Qi4; Gao, Shiqiu1; Xu, Guangwen1
2018-04-01
Source PublicationAPPLIED ENERGY
ISSN0306-2619
Volume215Pages:348-355
Abstract

A multi-stage fluidized bed (MSFB) by configuring the distributor with an overflow standpipe between its neighboring stages was developed to couple the powder coal pyrolysis with its resultant char gasification for co-production of tar and syngas. This work succeeded in the smooth operation of MSFB for coal staged conversion. The three modes of coupling pyrolysis and gasification in terms of the one-stage, two-stage and three-stage bed characterized by temperature drop from the bottom up were investigated to evaluate the quality of the liquid and gas products. Coupling low- and mid-temperature tandem coal pyrolysis with high-temperature char gasification in the MSFB improved the quality of tar and syngas. The obtained tar yield was over 80% of the Gray King assay tar yield and its light tar fraction (boiling point < 360 degrees C) was as high as 70-80% in the MSFB. Syngas with CH4 content of 5.2 vol.% was produced that was suitable for SNG production. Inside the reactor, the flow direction of pyrolysis volatiles toward the temperature drop avoided the deep secondary reaction of tar. Syngas and steam from the bottom gasification section could contribute to the formation of light tar and CH4 by affecting the top coal pyrolysis. A comparison with the typical pyrolysis processes suggested that the MSFB process had its own advantages in treating powder coal to produce the high-quality tar and syngas.

KeywordCoal Pyrolysis Multi-stage Fluidized Bed Tar Syngas Char Gasification
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.apenergy.2018.02.023
Indexed BySCI
Language英语
WOS KeywordFixed-bed ; Brown-coal ; Oil-shale ; Temperature ; Technology ; Internals ; Steam ; Destruction ; Atmospheres ; Conversion
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationNational Key Research and Development Program of China(2016YFB0600304)
WOS IDWOS:000428974500027
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/24182
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
3.Chinese Acad Sci, Inst Urban Environm, Xiamen 361021, Peoples R China
4.Coal Sci & Technol Res Inst Co Ltd, Beijing Res Inst Coal Chem, Beijing 100013, Peoples R China
Recommended Citation
GB/T 7714
Chen, Zhaohui,Li, Yunjia,Lai, Dengguo,et al. Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas[J]. APPLIED ENERGY,2018,215:348-355.
APA Chen, Zhaohui.,Li, Yunjia.,Lai, Dengguo.,Geng, Sulong.,Zhou, Qi.,...&Xu, Guangwen.(2018).Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas.APPLIED ENERGY,215,348-355.
MLA Chen, Zhaohui,et al."Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas".APPLIED ENERGY 215(2018):348-355.
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