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Citation: LI Wei-wei, HUANG Jie-jie, WANG Zhi-qing, DUAN Hui-wen, LI Jun-guo, FANG Yi-tian. Reaction kinetics of coal char gasification with CO₂ and the effect of internal diffusion on the gasification[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(12): 1416-1421. shu

Reaction kinetics of coal char gasification with CO₂ and the effect of internal diffusion on the gasification

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: HUANG Jie-jie, huangjj@sxicc.ac.cn
Received Date: 29 July 2016
Revised Date: 9 October 2016

Figures(7)

The effects of temperature (850-1 150℃) and particle size (<60, 505, 950, 1 515 and 2 000 μm) on the gasification of Shenmu coal char with CO₂ were investigated by using thermogravimetric apparatus (TGA) under atmospheric pressure. Three kinetic models of volumetric, shrinking core and random pore were applied to validate the experimental results, which illustrates that the random pore model can accurately predict the conversion rate for coal char gasification. Thiele modulus and effectiveness factor were determined on the basis of the intrinsic kinetic rate at 850-1 000℃; a comparison between calculated and experimental effective factors suggests that the calculated effective factor can give a quantitative estimation of the effect of internal diffusion on the initial stage of gasification, but cannot describe the whole gasification process.
- gasification,
- coal char,
- random pore model,
- intra-particle diffusion,
- effective factor
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