多孔介质干燥机理在褐煤热力脱水中的应用  

APPLICATION OF THE DRYING MECHANISM OF POROUS MEDIA IN THE THERMAL DEHYDRATION FOR LIGNITE

作　　者：王秀军[1] 张守玉[1] 彭定茂[1] 王健[1] 郝正虎 吕俊复[2] 

机构地区：[1]上海理工大学能源与动力工程学院燃烧与气化研究所,上海硕士生200093 [2]清华大学热能工程系,北京硕士生100084

出　　处：《煤炭转化》2011年第1期82-86,共5页Coal Conversion

基　　金：上海市教育委员会科研创新项目(11YZ108)

摘　　要：我国褐煤资源丰富,但是由于其水分高,导致了褐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褐煤的水分含量,有利于褐煤运输和贮存,提高锅炉燃烧效率.从褐煤结构出发,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.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 cap- ital 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.

关 键 词：褐煤 干燥 多孔介质 模型 

分 类 号：TQ533[化学工程—煤化学工程]