褐煤流态化温和干燥研究  

Fluidized drying of lignite under mild conditions

作　　者：韦鲁滨[1] 朱学帅[1] 刘道春[1] 万光显 曾鸣[1] 王俊宇[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《中国矿业大学学报》2014年第2期300-304,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51174214);国家重点基础研究发展计划(973)项目(2012CB214904);国家科技支撑计划项目(2012BAA04B02);高等学校博士学科点专项科研基金项目(20120023110017)

摘　　要：分析了褐煤流态化温和干燥过程,以褐煤表面水脱除率和黏附加重质量为考察指标,研究了干燥温度、热气流量、干燥时间、表面水、入料粒度等因素对褐煤干燥特性的影响.结果表明:干燥温度、干燥时间对褐煤表面水脱除影响显著,可根据褐煤表面水分确定干燥温度和干燥时间;表面水分为0.8%的较难选褐煤,在干燥温度85℃,干燥时间2min时,表面水脱除率可达94%,可能偏差E值为0.046g/cm3,干燥褐煤在未脱介前的黏附加重质量仅为0.12%;相同条件下,褐煤入料粒度越大,表面水脱除率越低,黏附加重质量越大.The fluidized drying process of lignite under mild conditions was analyzed. The effects of surface moisture, drying temperature, hot air flow, drying time and particle size on the drying characteristics of lignite were investigated by measuring the removal efficiency of surface water and the quantity of adhesive medium solids. The results show that the drying temperature and time affected the drying of lignite significantly, which were determined by the surface moisture. The removal efficiency of surface water increased continuously with the in- creasing of drying temperature and time. For the lignite difficult to separate with surface mois- ture of 0.8%, the removal efficiency of surface water reached up to 94% and E value of 0. 046 g/cm^3 at 85 ℃ for 2 min. The quantity of adhesive medium solids was only 0.12% before de- medium. Under the same conditions, with the increasing of the particle size of lignite, the re- moval efficiency of surface water decreased and the quantity of adhesive medium solids in- creased.

关 键 词：流态化 褐煤 干燥 加重质 黏附 

分 类 号：TD94[矿业工程—选矿]