Modification of a Sub-bituminous Coal by Hydrothermal Treatment with the Addition of CaO: Extraction and Caking Properties

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• 作者：Hengfu Shui ; Xiangyu Zhang ; Zhicai Wang ; Changhui Lin ; Zhiping Lei ; Shibiao Ren ; Shigang Kang
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：May 17, 2012
• 年：2012
• 卷：26
• 期：5
• 页码：2928-2933
• 全文大小：263K
• 年卷期：v.26,no.5(May 17, 2012)
• ISSN：1520-5029

文摘

A Chinese sub-bituminous coal, i.e., Shengfu (SF) coal, was hydrothermally treated with and without CaO addition at different temperatures, and the extraction yields and caking indexes (G_RI) of the treated coals were measured. The action of CaO during hydrothermal treatment was probed in this study. The results show that hydrothermal treatment can obviously increase the extraction yield and G_RI of SF coal, and CaO can further promote this effect of hydrothermal treatment. The removal of oxygen functional groups, especially the hydroxyl group, dissociating the aggregated structure of coal, is responsible for the modifying results. CaO can supply a basic environment for the hydrothermal treatment, which is beneficial for the removal of acidic oxygen functional groups by acid鈥揵ase interactions and promotes the effect of hydrothermal treatment for SF coal, resulting in additional increases in the extraction yield and G_RI.