Citation: WANG Zhi-cai, PAN Chun-xiu, REN Shi-biao, LEI Zhi-ping, WANG Xiao-ling, SHUI Heng-fu. Modification of Xianfeng lignite by thermal treatment and hydrothermal treatment[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(9): 1032-1037. shu

Modification of Xianfeng lignite by thermal treatment and hydrothermal treatment

1.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Anhui Key Laboratory of Clean Coal Conversion & Utilization, Ma'anshan 243002, China

Corresponding author: WANG Zhi-cai,
Received Date: 10 May 2015
Available Online: 10 July 2015
Fund Project: 国家自然科学基金(21476004, 21476003, 21476002, 21306001, U1361125)) (21476004, 21476003, 21476002, 21306001, U1361125)) 国家自然科学基金重点项目(U1261208) (U1261208)

Modification of low rank coal by thermal treatment is the key to its high-efficiency conversion and utilization. In this paper, the thermal treatment and hydrothermal treatment of Xianfeng lignite were carried out. By combination of the characterizations of structure and properties of treated coals, the modification of thermal treatment and the interaction of water in the hydrothermal process were investigated. The results indicate that the disassociation of non-covalent bonds and the pyrolysis of weak covalent bonds dominate in the treatment process below the pyrolystic temperature of lignite. The hydrothermal reaction can inhibit the pyrolysis of coal matrix and the release of small molecular compounds in the process of hydrothermal treatment. At higher than the pyrolysis of lignite, the thermal treatment shows obvious pyrolysis and deoxygenation. The hydrothermal reaction can provide active hydrogen to stabilize the pyrolysis fragment and avoid the secondary pyrolysis and condensation, so that the extraction and swelling properties of hydrothermal treated coal in mixed solvent were improve at certain extent.
- Xianfeng lignite,
- thermal treatment,
- hydrothermal treatment,
- structural characterization
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