Comprehensive study on the effect of CO2 on coal pyrolysis at fast heating rate

Huanying Chi; Hanjian Li; Kai Xu; He Liu; Sheng Su; Song Hu; Jun Xiang

Energy Reports (Nov 2021)

Comprehensive study on the effect of CO2 on coal pyrolysis at fast heating rate

Huanying Chi,
Hanjian Li,
Kai Xu,
He Liu,
Sheng Su,
Song Hu,
Jun Xiang

Affiliations

Huanying Chi: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Hanjian Li: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Kai Xu: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Corresponding author.
He Liu: Institute of Quartermaster Engineering and Technology, Beijing 100010, China
Sheng Su: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China
Song Hu: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China
Jun Xiang: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China

Journal volume & issue: Vol. 7
pp. 1369 – 1378

Abstract

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Oxy-fuel combustion is considered one of the most effective CO2 emission control technologies, and CO2 has a very important effect on coal pyrolysis. A novel Concentrating Photothermal Thermogravimetric Analyzer was developed to study the effect of CO2 on coal pyrolysis at fast heating rate of 1000 °C/min. Coal conversion characteristics, kinetics and structural evolution of coal/char were analyzed comprehensively and quantitatively. The average mass loss rates at 1000 °C/min under various CO2 atmospheres were about two orders of magnitude higher than those at 10 °C/min. The activation energies calculated by the best-fitted D3 model were 34.52–36.22 kJ/mol under various CO2 atmospheres. CO2 inhibited functional groups transformation, aromatization rate within 500 °C and formation of stable radicals, but promoted coal aromatization at relatively higher temperature and induced gasification.

Published in Energy Reports

ISSN: 2352-4847 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: http://www.journals.elsevier.com/energy-reports/

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