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Effects of H2O gasification reaction on the characteristics of chars under oxy-fuel combustion conditions with wet recycle Jun Xu, Sheng Su, Zhijun Sun, Ningning Si, Mengxia Qing, Lijun Liu, Song Hu, Yi Wang, and Jun Xiang Energy Fuels, Just Accepted Manuscript • DOI: 10.1021/acs.energyfuels.6b01725 • Publication Date (Web): 13 Oct 2016 Downloaded from http://pubs.acs.org on October 19, 2016
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Energy & Fuels
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TITLE PAGE
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a. Title of the paper
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Effects of H2O gasification reaction on the characteristics of chars under oxy-fuel combustion
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conditions with wet recycle
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b. Authors and affiliations
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Jun Xu, Sheng Su*, Zhijun Sun, Ningning Si, Mengxia Qing, Lijun Liu, Song Hu, Yi Wang,
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Jun Xiang*
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State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong
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University of Science and Technology, Wuhan, 430074, China
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c. Corresponding author
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State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong
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University of Science and Technology, Wuhan, 430074, China
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Phone: (+86) 27-87542417-8206; Fax: (+86) 27-87545526
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E-mail:
[email protected] 15
[email protected] (Sheng Su) (Jun Xiang)
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ACS Paragon Plus Environment
Energy & Fuels
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ABSTRACT
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This work aims to clarify the potential effects of H2O gasification reaction on the
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characteristics of chars under oxy-fuel combustion conditions with wet recycle. Chars of a Chinese
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sub-bituminous coal were prepared in a fluidized-bed/fixed-bed reactor at 1350 K under CO2/N2、
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H2O/N2 and CO2/H2O atmospheres. Structures of the chars undergoing some extent gasification
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were characterized with Micro-Raman spectrometer, Fourier transform infrared spectrometer and
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N2 adsorption technique. Char combustion reactivity was also obtained in a thermogravimetric
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analyzer to reveal the effects of structure changes on the char combustion reactivity in oxy-fuel
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combustion. The results indicate H2O gasification reaction can really take place and accelerate the
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char consumption in CO2/H2O, but the effect extent is lower than that in H2O/N2. The H2O
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gasification reaction would affect the chemical structures of the char with increasing H2O
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concentration in CO2/H2O, and different phenomena are observed for the change of char
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characteristics at high H2O concentration and low H2O concentration. The N2 adsorption data
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indicate more pores>10 nm and less pores
