固体返料气流-流化组合干燥器的湿含量分布  

DISTRIBUTION OF MOISTURE CONTENT FOR COMPOUND DRYERS OF FLASH AND FLUIDIZATION WITH CIRCULATING SYSTEM OF SOLIDS

作　　者：叶世超[1] 

机构地区：[1]四川大学化学工程系,成都610065

出　　处：《化工学报》2000年第1期63-69,共7页CIESC Journal

基　　金：国家自然科学基金!资助项目 (No 2 95762 53)

摘　　要：分析了固体返料气流 -流化组合式干燥器出口粒子湿含量分布特性 ,建立了湿含量分布密度函数 ,并就硫酸亚铁的干燥过程进行了模拟计算 结果表明 ,具有降速段的流化床干燥器的优化设计 ,除了应满足干燥过程的热量供求平衡并由此确定流化床底面积外 .还应满足 :①保证湿分传质汽化所需的停留干燥时间 ,应根据干燥所需的平均停留时间来确定流化床容积 ;②控制湿含量的分散程度 ,应由干燥产品的均匀性指标来确定流化床室数 .The density function was developed for predicting the distribution of moisture content of compound dryers of flash and fluidization with a circulating system of solids The moisture content distribution of drying FeSO 4·7H 2O was calculated. The results show that there are three necessary conditions for the optimum design of fluidized dryers. The first is the heat supply for drying process. The bottom area of fluidized beds is deter mined in terms of the required heat supply. The second is the average residence time of particulate material in fluidized beds. The volume of fluidized dryers is calculated from the mean residence time. And the last is the uniformity of product moisture content. The number of rooms of fluidized beds is predicted in order to satisfy the required uniformity.msofthereq

关 键 词：干燥 湿含量分布 固体返料气流 干燥器 流化组合 

分 类 号：TQ028.672[化学工程] TQ051.892