Drying of granulated products by conventional heat transfer and high-frequency techniques

In this study the contribution of the different heat transfer methods in the drying of granulated materials is analysed from the viewpoint of the available electro-heat technology. Although the work has been directed to present day commercial applications and proposes definite drying schemes the research has been focused on high frequency heating techniques, which appear to be the most promising alternatives as far as medium and large throughput continuous processes are concerned. An experimental rig has been designed and built, this unit has been used to obtain a preliminary set of data on the performance of the high frequency drying process under different operating conditions.