Prediction of Shell Porosities in Continuous Fluidized Bed Spray Layering

Abstract

In this work, experimental results for a continuous fluidized bed spray layering process are used to identify product quality influencing process parameters, such as the shell porosity. The prediction of the shell porosity is based on an empirical relation established for fluidized bed layering in batch mode. It uses gas-side properties, which are represented by the drying potential of the gas. It is shown that the shell porosities forming in the continuous mode can be deduced from this relation by comparing experimental data and simulation results. Process stability and seed formation are also discussed using the obtained experimental data.

Keywords:

• Drying conditions
• Particle growth
• Shell porosity
• Spray granulation