Effect of CO<sub>2</sub> on pyrolysis behavior of Shengli lignite

HAO Cheng-hao; ZHU Sheng-hua; BAI Yong-hui; LI Fan

Volume 45 Issue 3

Mar. 2017

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Article Navigation > Journal of Fuel Chemistry and Technology > 2017 > 45(3): 272-278

HAO Cheng-hao, ZHU Sheng-hua, BAI Yong-hui, LI Fan. Effect of CO2 on pyrolysis behavior of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2017, 45(3): 272-278.

Citation:

HAO Cheng-hao, ZHU Sheng-hua, BAI Yong-hui, LI Fan. Effect of CO₂ on pyrolysis behavior of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2017, 45(3): 272-278.

HAO Cheng-hao, ZHU Sheng-hua, BAI Yong-hui, LI Fan. Effect of CO2 on pyrolysis behavior of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2017, 45(3): 272-278.

Citation:

HAO Cheng-hao, ZHU Sheng-hua, BAI Yong-hui, LI Fan. Effect of CO₂ on pyrolysis behavior of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, 2017, 45(3): 272-278.

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Effect of CO₂ on pyrolysis behavior of Shengli lignite

State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by National High Technology Research and Development Program of China (863 program, 2015AA050503)

Received Date: 2016-11-02
Rev Recd Date: 2016-12-30

Available Online: 2021-01-23

Publish Date: 2017-03-10

Abstract

Abstract

The pyrolysis of Shengli lignite (5-8 mm) under CO₂ atmosphere was investigated at the temperature from 400 to 700℃ in a fixed bed reactor, the effect of CO₂ on the distribution of gas, solid and liquid phase in the product was analyzed, and the influence mechanism on the char structure under CO₂ atmosphere was explored. The results indicate that the yields of tar and water from pyrolysis under CO₂ atmosphere are higher than that under N₂ atmosphere, with a decrease in char and gas yield. At 400℃ and 500℃, the surface area and pore volume of the char prepared under CO₂ atmosphere are nearly the same as that under N₂ atmosphere, while at 600 and 700℃, the surface area and pore volume of the char prepared under CO₂ atmosphere are higher than that under N₂ atmosphere. It maybe attributes to that CO₂ can not only promote the release of volatile, but can also react with the active sites in the channels of char. The introduction of CO₂ into pyrolysis can increase the aromaticity of char due to the consumption of 3-5 rings aromatic structures. The yields of H₂ and CH₄ obtained from pyrolysis under CO₂ atmosphere are lower than that obtained under N₂ atmosphere at 600 and 700℃, and the yield of CO is much higher because of the occurrence of the char-CO₂ reaction.
- lignite,
- pyrolysis,
- char property,
- CO₂ atmosphere

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References(27)

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