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Indexed by:会议论文

Date of Publication:2012-06-23

Included Journals:EI、CPCI-S、Scopus

Volume:524-527

Page Number:887-+

Key Words:lignite; thermal upgrading; surface properties

Abstract:Lignite samples, Huolinhe(HLH) and Xiaolongtan(XLT) lignites were used for experiments. Mild pyrolysis experiments were carried out by final temperature 150 similar to 450 degrees C. Physical and chemical properties have been investigated using thermogravimetric, FTIR analysis, nitrogen adsorption and oxygen-functional group analysis. Besides, the changes of the surface properties during upgrading were characterized in detail. The results show that specific surface area and moisture-holding capacity have the trend of first decreases and then increases in the upgrading temperature range. Furthermore, the decomposition of the oxygen-bearing functional groups on the coal surface which reduced the moisture-holding capacity. Oxygen absorption experiments indicate that thermal upgrading could decrease the tendency of lignite to spontaneous combustion.