Citation: ZHANG Xiao-pei, ZHANG Cheng, YU Sheng-hui, LI Xin, FENG Xiao-fei, MA Ya-fei, CHEN Gang. Changes of Zhundong coal properties by hydrothermal upgrading and its impacts on CO₂ gasification[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(10): 1185-1190. shu

Changes of Zhundong coal properties by hydrothermal upgrading and its impacts on CO₂ gasification

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: ZHANG Cheng, chengzhang@mail.hust.edu.cn
Received Date: 9 June 2017
Revised Date: 25 July 2017

Fund Project: National Natural Science Foundation of China 51676076The project was supported by National Natural Science Foundation of China (51676076), National Program of International Science and Technology Cooperation (2015DFA60410) and Graduates' Innovation Fund of HUST (5003120003)Graduates' Innovation Fund of HUST 5003120003National Program of International Science and Technology Cooperation 2015DFA60410

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The Zhundong high sodium coal was hydrothermally upgraded at 150-350℃ in an autoclave. The inductively coupled plasma mass spectrometer (ICP-MS), nitrogen adsorption isotherm (BET) and X-ray diffraction (XRD) were used to investigate the changes of coal properties and the impacts on the CO₂ gasification characteristics. The results indicate that the coal quality is increased after the hydrothermal upgrading. The removal effect of sodium is obvious, reaching to more than 95% at 300-350℃. The pore structure of the chars changes significantly, the specific surface area and total pore volume increase initially at 150-300℃ and then decrease at 300-350℃. The crystalline structure tends to be aromatic and graphitized, and the chemical structure becomes dense, orderly and stable. Additionally, the gasification reactivity exhibits a decreasing trend, especially for the chars treated at 300-350℃. The CO₂ gasification reactivity during the process of hydrothermal upgrading is comprehensively influenced by different factors containing coal rank, sodium content, physical pore structure and chemical microcrystalline structure.
- Zhundong coal,
- hydrothermal upgrading,
- coal properties,
- sodium removal,
- CO₂ gasification
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Changes of Zhundong coal properties by hydrothermal upgrading and its impacts on CO2 gasification

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Changes of Zhundong coal properties by hydrothermal upgrading and its impacts on CO₂ gasification