喷雾干燥粘壁的原因与解决途径

Reasons for wall sticking during spray drying and countermeasures

对喷雾干燥粘壁的类型和原因进行了分析。喷雾干燥粘壁主要有半湿物料粘壁、低熔点物料的热熔性粘壁和干粉表面粘附三种类型。半湿物料粘壁主要与喷雾干燥塔结构、雾化器结构、安装、操作以及热风在塔内的运动状态有关。物料熔点低于干燥温度时容易产生热熔性粘壁。干粉表面粘附与塔壁的几何形状、粗糙程度、空气流速、静电力等有关。提出了解决各种类型粘壁的技术措施。

The types and reasons for wall sticking during spray drying were analysed. There are three types of wall sticking： half wet materials, materials with low melting wet material is concerned to the structure, fixing and operation tion of hot air in tower. The melting sticking occurred when the point, dry powder. The wall sticking of half of spray drying tower and sprayer,the momelting point of materials is lower than the drying temperature. The wall sticking of dry powder is concerned to geometric figure of cyclone chamber, roughness of wall,velocity of air and static charge. The methods for resolving the wall sticking were put forward.