Waste-free wood processing technologies are conditioned by the economic and environmental aspects of human activity. One of the stages of such technologies is processing of wood waste into fuel pellets, for the production of which appropriate lines are used. They include a large number of different machines. The article presents the results of studies of the working process of SB-2 dryer produced by Doza-Agro LLC, which is a part of these lines. The paper presents its scheme and describes the

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... inciple of operation, evaluates the efficiency of the dryer working process depending on the feedstock parameters. Work process of the drying drum was carried out in the conditions of IP Kabanov, IP Bratchikov, Penza-Pellet LLC, Togliatinsky Pellet Plant LLC, Promlesilim LLC, Maslyaninsky LLC, Ekolesprom LLC, Bryansk Broiler LLC, Tandem VP LLC. The influence of feedstock moisture content, temperature of the feedstock and the particle size has been determined. The particle size was estimated by their surface area. The efficiency of the dryer was evaluated by its productivity, expressed as a percentage of the maximum possible one and obtained under optimal conditions. After processing statistical information, a second-order regression model has been obtained, which characterizes the drying process of crushed material the SB-2 dryer. It was revealed that feedstock moisture content has the greatest influence on the working process of SB-2 dryer. The drying process of crushed wood material differs from the drying process of chips. Namely, the temperature of the dryer has the smallest effect on the performance when drying the crushed material. When drying the shavings, their size has the smallest effect.