There is lots of lignite in China and most of the lignite is used directly in power generation nearby. However, the application of lignite in power generation results in a high capital cost and low combustion efficiency because of its high moisture content. Thus the dewater of lignite is very important. The moisture content of lignite can be decreased by drying with the changes in its internal composition and structure. Based on its high porosity, it is suggested to model the drying process as a porous media in this paper. Therefore, the drying process characteristics of porous media is firstly addressed. Moreover, the current drying mechanism of porous media and its future trend are introduced detailedly.%我国揭煤资源丰富,但是由于其水分高,导致了揭煤燃烧发电效率低下,不宜远距离运输.通过热力干燥可降低揭煤的水分含量,有利于揭煤运输和贮存,提高锅炉燃烧效率.从揭煤结构出发,提出其热力干燥过程的模型可将之视为多孔介质.分析了多孔介质的干燥过程特点,阐述了目前国内外的多孔介质干燥机理,总结了相关的多孔介质干燥模型,为多孔介质褐煤热力脱水模型化提供理论支持.
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