煤的内热流化床干燥实验研究  

EXPERIMENTAL STUDY ON COAL DRYING IN INTERNAL-HEATED FLUIDIZED BED DRYER

作　　者：韩树晓 向飞[2] 王月[1] 那永洁[2] 

机构地区：[1]中国科学院大学,北京硕士生100049 [2]中国科学院工程热物理研究所,北京高级工程师100190

出　　处：《煤炭转化》2014年第1期28-31,共4页Coal Conversion

摘　　要：在内热式流化床干燥器实验装置上完成了湿煤的干燥实验,验证了工艺可行性.通过调节干燥实验装置的干燥处理量,考察了流化床平均温度分别为83℃,89℃,102℃时的干燥强度、换热强度及耗热项等工艺特性.在较低的流化速度(0.37 m/s^0.41 m/s)和83℃~102℃的流化床平均温度范围内,实验装置可以稳定运行;以设计的最大干燥处理量114 kg/h运行时,流化床平均温度为83℃,干燥强度为76.5 kg/(m^2·h),蒸汽盘管的换热强度为4 172 W/m^2,干燥器平均传热系数为200W/(m^2·K),干燥煤中水分耗热比率为52%,加热流化风耗热比率和干燥器散热比率均为20%,加热物料耗热比率为8%.The drying of coal was studied in a internal-heated fluidized bed dryer.The process parameters,drying intensity,heat transfer intensity and percentage of heat consumption distribution were calculated with the test results at the different fluidized bed temperatures,83 ℃,89 ℃ and 102 ℃.The dryer was operated at low fluidizing velocities （0.37 m/s-0.41 m/s） and average fluidized bed temperatures of 83 ℃-102 ℃.The maximum drying capacity 114 kg/h was attained at 83 ℃,meanwhile the drying intensity was 76.5 kg/（m2 · h）,the heat transfer intensity of the steam tubes was 4 172 W/m2,the average heat exchange rate of the fluidized bed was 200 W/（m2· K）,the heat consumption for evaporation of water in coal was 52％,the heat consumption of heating fluidized air and dryer heat loss were both 20％,the heat consumption of heating coal was 8％.

关 键 词：冷凝换热器 干燥强度 流化床 

分 类 号：TQ051.13[化学工程] TQ028.672