Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation

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	Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation
	Zhang Haixia 1; Zhang Yukui 1,2; Zhu Zhiping 1; Lu Qinggang 1
刊名	JOURNAL OF THERMAL SCIENCE
	2016-08-01
卷号	25 期号:4 页码:363-371
关键词	gasification circulating fluidized bed sulphur transformation O-2/C molar ratio
英文摘要	To promote the utilization efficiency of coal resources, and to assist with the control of sulphur during gasification and/or downstream processes, it is essential to gain basic knowledge of sulphur transformation associated with gasification performance. In this research we investigated the influence of O-2/C molar ratio both on gasification performance and sulphur transformation of a low rank coal, and the sulphur transformation mechanism was also discussed. Experiments were performed in a circulating fluidized bed gasifier with O-2/C molar ratio ranging from 0.39 to 0.78 mol/mol. The results showed that increasing the O-2/C molar ratio from 0.39 to 0.78 mol/mol can increase carbon conversion from 57.65% to 91.92%, and increase sulphur release ratio from 29.66% to 63.11%. The increase of O-2/C molar ratio favors the formation of H2S, and also favors the retained sulphur transforming to more stable forms. Due to the reducing conditions of coal gasification, H2S is the main form of the released sulphur, which could be formed by decomposition of pyrite and by secondary reactions. Bottom char shows lower sulphur content than fly ash, and mainly exist as sulphates. X-ray photoelectron spectroscopy (XPS) measurements also show that the intensity of pyrite declines and the intensity of sulphates increases for fly ash and bottom char, and the change is more obvious for bottom char. During CFB gasification process, bigger char particles circulate in the system and have longer residence time for further reaction, which favors the release of sulphur species and can enhance the retained sulphur transforming to more stable forms.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Thermodynamics ; Engineering, Mechanical
研究领域[WOS]	Thermodynamics ; Engineering
关键词[WOS]	COMPOUNDS ABATEMENT ; STEAM GASIFICATION ; SYNTHESIS GAS ; PILOT-SCALE ; BIOMASS ; PYROLYSIS ; GASIFIER ; WASTES ; XPS ; PREDICTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000379376500009
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/112492]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang Haixia,Zhang Yukui,Zhu Zhiping,et al. Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation[J]. JOURNAL OF THERMAL SCIENCE,2016,25(4):363-371.
APA	Zhang Haixia,Zhang Yukui,Zhu Zhiping,&Lu Qinggang.(2016).Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation.JOURNAL OF THERMAL SCIENCE,25(4),363-371.
MLA	Zhang Haixia,et al."Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation".JOURNAL OF THERMAL SCIENCE 25.4(2016):363-371.