Drying Hawthorn Berries in Drum Dryer Using Blade Agitator
Abstract
Perennial provision of high-quality fruits and berries to population is a very important issue. Drying the products is an optimum solution to preserve quality of plant raw materials. This article discusses comparative experimental results of drying hawthorn berries in drying cabinet and drum dryer equipped with rotary cylindrical drum with rigidly fixed blades and internal blade agitator rotating in the contrary direction with respect to the drum. It has been established that drying from initial moisture content of 74.9% to final level of 20% in drying cabinet requires 11 hours at average power consumption of 2.3 kWh/kg of evaporated moisture, whereas drying in drum dryer with agitator requires 7 hours at average power consumption of 1.8 kWh/kg of evaporated moisture to final moisture content of 14%; moreover, it has been experimentally detected that drying in cabinet is heterogeneous over product bulk, the final product moisture content varies from 17.5 to 23.5%. Moisture content as a function of drying time is presented which demonstrates homogeneity of drying resulting in production of high-quality dried berries.
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References
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