大颗粒作用下微细粉流态化干燥研究  

STUDY ON FLUIDIZED DRYING OF FINE POWDERS WITH ADDITION OF LARGE INERT PARTICLES

作　　者：薛惠芳[1] 张万忠[1] 杨新雨 

机构地区：[1]沈阳化工学院化学工程系,沈阳110021

出　　处：《化工冶金》1996年第3期235-241,共7页

摘　　要：为了克服湿微细粉易于结团形成“细粉群”、不易流化和干燥的缺点，在微细粉中加入惰性大颗粒物料，由于大颗粒的“搅动”作用，使细粉分散，可提高流化质量，从而提高微细粉的流化干燥热效率．在实验基础上进行了物料衡算和热量衡算，并进行连续干燥热效率的计算．该方法为微细粉的流化干燥提供一条新的途径．Due to the adherence among wetted fine powder particles, the powders areprone to form clusters and become diffcult to be fluidized. In order to overcome this disad-vantage, certain amount of large inert particles is added into the fluidized bed. In this case,the clusters are destructed and dispersed by the agitating action of large particles, and both the quality of fiuidization and the thermal efficiency of fluidized drying are thus improved- A mathematical model based on the mass and energy conservation is used to simulate the process of dryig furfural powder and it is found that the calculated drying curves are in satisfactory agreement with the experimental data. A new equation is proposed to calculate the thermal efficiency of fiuldized drying and it is confirmed to be a reliable one for designing fluidized drying process with large particles added.

关 键 词：微细粉 流态化 干燥 热效率 大颗粒 

分 类 号：TQ028.67[化学工程]