Citation: JING Xu-liang, WANG Zhi-qing, ZHANG Qian, FANG Yi-tian. Combustion property and kinetics of fine chars derived from fluidized bed gasifier[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(1): 13-21. shu

Combustion property and kinetics of fine chars derived from fluidized bed gasifier

1.
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: FANG Yi-tian,
Received Date: 7 May 2013
Available Online: 5 September 2013
Fund Project: 国家自然科学基金(21106173) (21106173)中国科学院战略性先导科技专项(XDA07050100) (XDA07050100)中国科学院山西煤炭化学研究所青年人才基金(2011SQNRC)。 (2011SQNRC)

The combustion properties of 3 fine chars derived from fluidized bed gasification of coals with different rank were studied in a thermogravimetric analyzer (TGA). In addition, the influence of ash on combustion reactivity was investigated, and the processes were analyzed using three kinetic methods to obtain the kinetic parameters. The results suggest that the existence of volatile in fine char from low-rank lignite reduces its ignition temperature, while the decomposition of inherent minerals at relatively high temperature leads to a second peak in the DTG curve. The ashes of fine chars have an inhibiting influence on burn-out ability and comprehensive combustion reactivity. The kinetic analysis indicates that the activation energy increases with the increasing burnout extent. Compared with Coats-Redfern and Ozawa-Flynn-Wall methods, the Vyazovkin method fits the experiment results best.
- fluidized bed gasifier,
- fine char,
- combustion kinetics
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