Citation: SHEN Guo-dong, WANG Zhi-qi, WU Jing-li, HE Tao, LI Jian-qing, YANG Jing, WU Jin-hu. Combustion characteristics of low-rank coal chars in O₂/CO₂, O₂/N₂ and O₂/Ar by TGA[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(9): 1066-1073. shu

Combustion characteristics of low-rank coal chars in O₂/CO₂, O₂/N₂ and O₂/Ar by TGA

SHEN Guo-dong ^1,2 ,
WANG Zhi-qi ^1,*,, ,
WU Jing-li ¹ ,
HE Tao ¹ ,
LI Jian-qing ¹ ,
YANG Jing ¹ ,
WU Jin-hu ¹

1.
Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: WANG Zhi-qi, wangzq@qibebt.ac.cn
Received Date: 7 April 2016
Revised Date: 24 June 2016

Fund Project: Strategic Pilot Scientific & Technological Project of Chinese Academy of Sciences XDA0705100

Figures(6)

The combustion reactivity of two chars prepared from two low-rank coals in Northwest China were studied using a thermogravimetric analyzer (TGA). The effects of different atmospheres (O₂/CO₂, O₂/N₂ and O₂/Ar) and different oxygen concentrations on the combustion characteristics were investigated. The results indicate that both atmosphere and oxygen concentration show effectiveness on combustion of char. Compared with N₂ and Ar, CO₂ could significantly promote the reaction. When combustion atmosphere changes from O₂/CO₂ to O₂/Ar, the burnout temperature increases by 63.7 and 68.8℃ for the two chars respectively. Meanwhile, when the combustion atmosphere changes from O₂/CO₂ to O₂/N₂, that is 135.9 and 129.6℃, respectively. An increase in concentration of oxygen can also improve the combustion performance of chars in the test. At the same time, kinetic analysis of the combustion profiles of the chars reveals that both the apparent activation energy E and the pre-exponential factor A increased with increasing oxygen concentration and the compensation effect exists between activation energy E and pre-exponential factor A of chars' combustion.
- low-rank coal char,
- combustion characteristic,
- thermogravimetric analysis,
- O₂/N₂, O₂/CO₂ and O₂/Ar atmosphere,
- different oxygen concentration,
- kinetics analysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Combustion characteristics of low-rank coal chars in O2/CO2, O2/N2 and O2/Ar by TGA

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通讯作者: 陈斌, bchen63@163.com

Combustion characteristics of low-rank coal chars in O₂/CO₂, O₂/N₂ and O₂/Ar by TGA