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论文类型：会议论文
发表时间：2012-06-23
收录刊物：EI、CPCI-S、Scopus
卷号：524-527
页面范围：887-+
关键字：lignite; thermal upgrading; surface properties
摘要：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.