内热式惰性粒子流化床中膏状物料干燥模型  

Drying model of paste materials in fluidized bed with inert particles and submerged heating tubes

作　　者：朱学军[1] 叶世超[2] 

机构地区：[1]攀枝花学院生物与化学工程学院,四川攀枝花617000 [2]四川大学化工学院,四川成都610065

出　　处：《化工学报》2010年第3期601-606,共6页CIESC Journal

摘　　要：通过对惰性粒子流化床中膏状物料干燥机理的分析,得到了干燥时间及单位面积床层水分汽化量的数学计算式,可对干燥器的性能进行预测。采用带浸没加热管的惰性粒子流化床对膏状钛白物料进行干燥中试研究,采用气流式喷嘴将膏状物料分散成200～400μm的小液滴喷洒在惰性粒子表面进行干燥,探索了适宜的干燥条件,测定和确定了最佳的干燥工艺参数、操作参数和设备参数。结果表明:该干燥工艺能强化床内传热传质,促进高黏性膏糊状物料很好地分散,床层温度分布均匀,干燥器的操作弹性大,热量消耗低,干燥强度高,传热系数可达300W·m-2·K-1以上。The mechanism for drying paste materials was investigated in a fluidized bed with inert particles and submerged heating tubes.The correlation equations were obtained for the drying time and specific evaporation rate of water,from which the drying performance can be predicted.The paste TiO2 material was dried in a fluidized bed in pilot plant with inert particles and submerged heating tubes.The paste material was sprayed in droplet to the surface of inert particles in the range of 200—400 μm with air-blast nozzles.The appropriate drying parameters,operation parameters and equipment parameters were explored.The results show that this drying technology enhances the heat transfer and the paste material with high viscosity can be effectively distributed into the fluidized bed,with uniform temperature in the bed,large flexibility of operation,and low energy consumption.The new drying equipment has high drying capacity,and the heat transfer coefficient is more than 300 W·m-2·K-1.

关 键 词：惰性粒子 内热式流化床 膏状物料干燥 水分汽化量 

分 类 号：TQ021.3[化学工程] TQ021.4