Fluidisation of amorphous granules: Practical challenges, product structures and progress in modelling

摘要

In many industries amorphous powders are agglomerated and granules are dried in fluid beds. The current contribution discusses issues related to fluid bed processing observed in industrial applications. Fluidization of irregular shaped particles is discussed and published equations for calculating the minimal fluidization velocity are validated for real food granules. Furthermore lumping and bed collapse which are occasionally observed during fluid bed agglomeration of amorphous water soluble powders is investigated. Temperature and moisture conditions leading to such undesired agglomeration effects are defined based on changing material properties. Finally the state of the art in modeling of fluidized bed systems is briefly described.