Influence of inherent minerals on CO<sub>2</sub> gasification of a lignite with high ash content

LI Chang-lun; WANG Yong-gang; LIN Xiong-chao; TIAN Zhen; WU Xin; YANG Yuan-ping; ZHANG Hai-yong; XU De-ping

Volume 45 Issue 7

Jul. 2017

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Article Navigation > Journal of Fuel Chemistry and Technology > 2017 > 45(7): 780-788

LI Chang-lun, WANG Yong-gang, LIN Xiong-chao, TIAN Zhen, WU Xin, YANG Yuan-ping, ZHANG Hai-yong, XU De-ping. Influence of inherent minerals on CO2 gasification of a lignite with high ash content[J]. Journal of Fuel Chemistry and Technology, 2017, 45(7): 780-788.

Citation:

LI Chang-lun, WANG Yong-gang, LIN Xiong-chao, TIAN Zhen, WU Xin, YANG Yuan-ping, ZHANG Hai-yong, XU De-ping. Influence of inherent minerals on CO₂ gasification of a lignite with high ash content[J]. Journal of Fuel Chemistry and Technology, 2017, 45(7): 780-788.

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Influence of inherent minerals on CO₂ gasification of a lignite with high ash content

School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Funds:

the National Natural Science Foundation of China 21406261

the Plan of National Science and Technology Support 2012BAA04B02

Received Date: 2017-02-13
Rev Recd Date: 2017-05-07

Available Online: 2021-01-23

Publish Date: 2017-07-10

Abstract

Abstract

Lignite samples with different ash contents and mineral composition were prepared by dry separation and acid washing. A drop tube reactor and thermogravimetric analyzer were used to study effect of inherent minerals on CO₂ gasification reaction of lignite at 1 000-1 200 ℃. The results show that the inherent minerals have positive effects on gasification, which are temperature sensitive. At lower gasification temperature (1 000 ℃) the inherent minerals can improve carbon conversion indirectly by obstructing the carbon structure order of nascent char. At higher temperatures (1 100-1 200 ℃)the inherent minerals can improve carbon conversion by catalyzing nascent char gasification directly. The alkaline index is not suitable for characterizing role of the inherent minerals of lignite in this case. Ca leads to the difference in catalytic activity of the inherent minerals where the most active form is carboxylate. Various catalytic mechanisms are the root cause of different catalytic activity of Ca in different chemical forms. Ca in the form of carboxylate can reduce the activation energy of coal/char gasification reaction, while CaO only promotes the apparent frequency factor.
- lignite,
- inherent minerals,
- CO₂ gasification,
- catalytic mechanism,
- chemical form

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References(32)

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