Abstract
This work examines the impact of pre-treatment of wood biomass with ultrasounds with the frequencies of 21 and 40 kHz on the process of convective drying in a chamber dryer. Convective drying is a relatively cheap and widely used method, characterized by a free flow of heated air by the material being dried. The white willow (Salix alba L.) was used in the research due to its availability and the highest coefficient of use for energy-related purposes in Poland. The goal of the work was to assess the impact of ultrasound pre-treatment of wood biomass on the process of convective drying. Samples of the white willow (Salix alba L.) were pre-treated with ultrasounds with the frequencies of 21 or 40 kHz for the period of 10, 30 and 60 min. After ultrasound pre-treatment, the material was dried in the convective dryer using free convection method, at the drying temperature of 60 °C.
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