【摘要】 以煤液化油衍生油为溶剂,在热萃取装置上研究了大唐胜利褐煤等低阶煤的热萃取性能,考察了热萃取温度、热萃取时间、溶煤比、溶剂类型和煤种等因素对煤热萃取性能的影响,同时对大唐胜利褐煤在热萃取过程中氧元素的脱除情况进行了研究.结果表明:煤的热萃取率随温度升高而明显增加,由340℃时的18.7%(daf)增加到430℃时的59.5%(daf),而固体热萃取物回收率在390℃时达到最高值32.4%(daf),反应停留时间以60min为宜,溶剂与煤的合适质量比为5∶1,在煤液化加氢循环溶剂中具有较高的热萃取率.热萃取过程中大唐胜利5#煤中氧元素的脱除率可达23%(daf).更多还原

【Abstract】 Thermal extraction of some low rank coals was studied on thermal extraction device using coal derived liquids.The influences of temperature,residence time,solvent-coal ratio,solvent and coal rank on thermal extraction yield were studied.Furthermore,the deoxidization yield of coal in the process of thermal extraction was investigated as well.The results show that the thermal extraction yield of coal increased from 18.7%(daf)at 340 ℃ to 59.5%(daf)at 430 ℃.However,the maximal the solid extract yield 32.4%(daf)at 390 ℃ can be obtained.The optimal residence time and ratio of solvent to coal was 60 min and 5∶1 respectively.Using the coal liquefaction recycle solvent,higher coal thermal extraction yield was obtained.23% oxygen content of Datang Shengli No.5 lignite was removed during the processing of thermal extraction at 390 ℃.更多还原