Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process

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	Coal Pyrolysis in a Fluidized Bed for Adapting to a Two-Stage Gasification Process
	Zeng, Xi 1; Wang, Yin 1; Yu, Jian 1; Wu, Shisheng 2; Zhong, Mei 1; Xu, Shaoping 2; Xu, Guangwen 1
刊名	ENERGY & FUELS
	2011-03-01
卷号	25 期号:3 页码:1092-1098
关键词	dried sewage-sludge pore structure reactivity gasifier reactor chars tar system temperatures morphology
ISSN号	0887-0624
其他题名	Energy Fuels
中文摘要	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.
英文摘要	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.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Energy & Fuels ; Engineering, Chemical
研究领域[WOS]	Energy & Fuels ; Engineering
关键词[WOS]	DRIED SEWAGE-SLUDGE ; PORE STRUCTURE ; REACTIVITY ; GASIFIER ; REACTOR ; CHARS ; TAR ; SYSTEM ; TEMPERATURES ; MORPHOLOGY
收录类别	SCI
原文出处	://WOS:000289613300028
语种	英语
WOS记录号	WOS:000289613300028
公开日期	2013-11-28
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/6280]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.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
推荐引用方式 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.