Citation: GAO Song-ping, ZHAO Jian-tao, WANG Zhi-qing, WANG Jian-fei, FANG Yi-tian, HUANG Jie-jie. Effect of CO₂ on pyrolysis behaviors of lignite[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(3): 257-264. shu

Effect of CO₂ on pyrolysis behaviors of lignite

1.
1. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: FANG Yi-tian,
Received Date: 15 October 2012
Available Online: 26 December 2012
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(XDA0705100) (XDA0705100)中国科学院山西煤炭化学研究所青年人才基金(2011SQNRC01)。 (2011SQNRC01)

The pyrolysis of Huolinhe lignite under CO₂ atmosphere was carried out in a thermobalance and a fast heating-up fixed bed reactor. The distribution of gases, char yield and its property such as element, surface structure, FT-IR spectra were analyzed. By this, the effect of CO₂ on the pyrolysis behaviors was studied. The results show that CO₂ gasification of the nascent char, which destroys the hydrogen-containing char structure, not only promotes cracking of benzene ring and fracture of hydroxyl, methyl and methylene groups etc., but also weakens the interaction between H and char matrix and increases the H fluidity, leading to the increase in the generation of H radicals. These H radicals can combine with other free radical fragments generated from fracture of the coal macromolecules to produce more volatiles. This will produce the char with a high specific surface and high pore volume and porosity. The introduction of CO₂ promotes the coal pyrolysis and generation of volatile, resulting in decrease in char yield and increase in the evolution amount of H₂, CO, CH₄ and other small molecules hydrocarbons.
- CO₂ atmosphere,
- pyrolysis behaviors,
- char property
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of CO2 on pyrolysis behaviors of lignite

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通讯作者: 陈斌, bchen63@163.com

Effect of CO₂ on pyrolysis behaviors of lignite