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Fundamentals of Catalytic Tar Removal over in Situ and ex Situ Chars in Two-Stage Gasification of Coal
Alternative TitleEnergy Fuels
Liu, Shuyuan1,2; Wang, Yin3; Wu, Rongcheng1; Zeng, Xi1; Gao, Shiqiu1; Xu, Guangwen1
2014
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume28Issue:1Pages:58-66
AbstractIntrinsic fundamentals of catalytic tar removal over coal char were studied in a laboratory two-stage gasification facility. The in situ char from coal pyrolysis (without cooling) exhibited higher activity for tar removal than the char experiencing its slow cooling in N-2 to room temperature. The tar content in dry producer gas can be as low as 100 mg/Nm(3) over the in situ char in 1.2 s of gas residence time inside the char bed at 1100 degrees C. Brunauer-Emmett-Teller surface area results showed that the in situ char has a larger specific surface area and more micropores than the ex situ char, while X-ray diffraction analysis clarified that the ordering of the carbon crystallite structure in the char increased with raising the temperature of tar removal. The latter is considered to be due to the facilitated secondary pyrolysis occurring to the ex situ char at increased temperatures. The secondary pyrolysis of the ex situ char also decreased its specific surface area and the amount of micropores. Severe coke deposition on the surface of spent char was observed, especially at temperatures above 1000 degrees C. The tar coking ratio defined as the mass ratio of coked tar over the totally converted tar reached as much as 0.7 when the temperature was 1100 degrees C and the gaseous tar residence time was 1.2 s. The coke formed on the char surface reduced the difference of structural properties between the in situ and ex situ chars and, in turn, decreased the difference in their performances for cracking tar.; Intrinsic fundamentals of catalytic tar removal over coal char were studied in a laboratory two-stage gasification facility. The in situ char from coal pyrolysis (without cooling) exhibited higher activity for tar removal than the char experiencing its slow cooling in N-2 to room temperature. The tar content in dry producer gas can be as low as 100 mg/Nm(3) over the in situ char in 1.2 s of gas residence time inside the char bed at 1100 degrees C. Brunauer-Emmett-Teller surface area results showed that the in situ char has a larger specific surface area and more micropores than the ex situ char, while X-ray diffraction analysis clarified that the ordering of the carbon crystallite structure in the char increased with raising the temperature of tar removal. The latter is considered to be due to the facilitated secondary pyrolysis occurring to the ex situ char at increased temperatures. The secondary pyrolysis of the ex situ char also decreased its specific surface area and the amount of micropores. Severe coke deposition on the surface of spent char was observed, especially at temperatures above 1000 degrees C. The tar coking ratio defined as the mass ratio of coked tar over the totally converted tar reached as much as 0.7 when the temperature was 1100 degrees C and the gaseous tar residence time was 1.2 s. The coke formed on the char surface reduced the difference of structural properties between the in situ and ex situ chars and, in turn, decreased the difference in their performances for cracking tar.
KeywordMicrostructural Changes Biomass-gasification Partial Oxidation Rapid Pyrolysis Heat-treatment Steam Reactivity Gasifier Gas Temperature
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ef4021153
URL查看原文
Indexed BySCI
Language英语
WOS KeywordMICROSTRUCTURAL CHANGES ; BIOMASS-GASIFICATION ; PARTIAL OXIDATION ; RAPID PYROLYSIS ; HEAT-TREATMENT ; STEAM ; REACTIVITY ; GASIFIER ; GAS ; TEMPERATURE
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000330018200007
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8103
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Urban Environm, Xiamen 361021, Peoples R China
Recommended Citation
GB/T 7714
Liu, Shuyuan,Wang, Yin,Wu, Rongcheng,et al. Fundamentals of Catalytic Tar Removal over in Situ and ex Situ Chars in Two-Stage Gasification of Coal[J]. ENERGY & FUELS,2014,28(1):58-66.
APA Liu, Shuyuan,Wang, Yin,Wu, Rongcheng,Zeng, Xi,Gao, Shiqiu,&Xu, Guangwen.(2014).Fundamentals of Catalytic Tar Removal over in Situ and ex Situ Chars in Two-Stage Gasification of Coal.ENERGY & FUELS,28(1),58-66.
MLA Liu, Shuyuan,et al."Fundamentals of Catalytic Tar Removal over in Situ and ex Situ Chars in Two-Stage Gasification of Coal".ENERGY & FUELS 28.1(2014):58-66.
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