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Title: Circulating Fluidized Bed Gasification of Low Rank Coal: Influence of O-2/C Molar Ratio on Gasification Performance and Sulphur Transformation
Author: Zhang Haixia1; null(张玉魁)1, 2; Zhu Zhiping1; Lu Qinggang1
Source: JOURNAL OF THERMAL SCIENCE
Issued Date: 2016-08-01
Volume: 25, Issue:4, Pages:363-371
Keyword: gasification ; circulating fluidized bed ; sulphur transformation ; O-2/C molar ratio
DOI: 10.1007/s11630-016-0872-9
DOC Type: Article
English Abstract: 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 Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Thermodynamics ; Engineering, Mechanical
WOS Subject Extended: Thermodynamics ; Engineering
WOS Keyword Plus: COMPOUNDS ABATEMENT ; STEAM GASIFICATION ; SYNTHESIS GAS ; PILOT-SCALE ; BIOMASS ; PYROLYSIS ; GASIFIER ; WASTES ; XPS ; PREDICTION
Indexed Type: SCI
Funder: National Natural Science Foundation of China(21306193) ; International Science & Technology Cooperation Program of China(2014DFG61680)
Language: 英语
WOS ID: WOS:000379376500009
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112492
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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