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Combustion characteristics of Zhundong coal by staged and direct chemical looping

2024 No. 06
481
103
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Authors:
YALKUNJANG Tursun
GAO Zhiwei
DAI Zhenghua
ZHONG Mei
JIN Lijun
LI Jian
LIU Yang
WEI Bo
Unit:
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,School of Chemical Engineering and Technology,Xinjiang University
Xinjiang Key Laboratory of Coal Clean Conversion & Chemical Engineering,School of Chemical Engineering and Technology,Xinjiang University
School of Chemical Engineering,Dalian University of Technology
Abstract:

Chemical looping combustion is recognized as an efficient technology for low-carbon emissions, offering distinct advantages inenhancing fuel utilization and decreasing CO2 emissions. In this study, Fe2O3 / Al2O3 oxygen carrier was employed in a two-stage fixed-bed reactor to conduct direct and staged chemical looping combustion experiments of Zhundong coal. The physicochemical properties of thefresh and spent oxygen carrier has been investigated. Results indicate that the carbon conversion and CO2 selectivity of the chemical looping combustion of Zhundong coal pyrolysis volatiles increase with increasing temperature and OC/ C ratio. The enhanced OC/ C ratio andtemperature contribute to an improves carbon conversion during the chemical looping combustion of Zhundong coal char, but with a decrease in CO2 selectivity. Compared to direct chemical looping combustion of coal, staged chemical looping combustion significantly improves the CO2 selectivity and slightly reduced the carbon conversion under the same condition. At a reaction temperature of 800 ℃ , theCO2 selectivity of staged chemical looping combustion reaches to 89.51%, representing a 29.18% increase compared to direct chemicallooping combustion. At a reaction temperature of 950 ℃ , the carbon conversion of staged chemical looping combustion is 60.40%, whichis 6.78% lower than that of direct chemical looping combustion. The reduction of degree the oxygen carrier with char is higher thanwith coal pyrolysis volatiles, suggesting that the reaction between char and the oxygen carrier is one of the limiting factors in the chemicallooping combustion of coal. This study provides a crucial theoretical foundation and technical support for achieving low-carbon clean combustion of Zhundong coal.

Keywords:
chemical looping combustion
oxygen carrier
pyrolysis volatiles
char
selectivity of CO2
Citation format:
亚力昆江·吐尔逊(1984—),男,新疆维吾尔自治区哈密人,副教授,博士。E-mail:yalkunjan54@aliyun.com
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Citation format:
YALKUNJANG Tursun,GAO Zhiwei,DAI Zhenghua,et al.Combustion characteristics of Zhundong coal by staged and direct chemical looping[J].Clean Coal Technology,2024,30(6):16-26.

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  • Executive director

    China Coal Science and Industry Group Co., Ltd

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  • Editor in Chief

    XIE Qiang

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    YU Chang
    SHI Yixiang
    ZHAO Yongchun
    DUAN Linbo
    CAO Jingpei
    ZENG Jie

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