流化床喷雾造粒技术进展

Progress of Spray Granulation in Fluidized Beds

本文介绍了流化床喷雾造粒技术,包括造粒机理、操作方式、影响因素等。流化床喷雾造粒是将溶液、悬浮液或熔融液喷雾到已经干燥或不完全干燥颗粒的流化床床层内,在同一设备内一步完成蒸发、结晶、干燥或化学反应的造粒过程。流化床造粒操作对颗粒的尺寸、形状要求不高,所得到的产品无结块、具有良好的流动性能。与其他传统的造粒方法相比,流化床造粒具有工艺流程简单、设备装置紧凑、投资省、生产强度大等优点,越来越引起人们的关注。

Spray granulation techniques in fluidized beds are overviewed in terms of the granulation mechanism,the operation mode and influenced factors.During the spray granulation,either solutions, suspensions or melted liquid are sprayed onto dried moist particles that are located in the flow zone of the fluidized bed,then the granulation process involving vaporization crystallization, dessication and chemical reactions completes in the same equipment.The spray granulation in fluidized beds is suitable to a wide range of particle sizes and shapes,and its products show good flowing property without aggregation.Compared with other traditional granulation methods, spray granulation techniques have attracted lots of concerns owing to the advantages of simple, equipment compactness, economic and high product capacity.