This is an open access article distributed under the CC BY 4.0
Volume 18 article 701 pages: 364 - 371
In the coming decades, wood waste management for biofuel production is regarded as a promising renewable energy source and a key factor in reducing carbon dioxide emissions. Mechanical grinding is seen as one of the main
techniques in wood waste pre-treatment operations that increases the value of feedstock used for fuel. The application potential of the ground product highly depends on the energy efficiency of the process.This work aimed to
establish a consistent pattern for estimating the energy consumption required for grinding spruce and pine barking
waste depending on the degree to which materials are ground and their relative moisture content. The energy consumption parameters at grinding were analyzed employing three grinding energy models of Rittinger, Kripichev-Kik,
and Bond. The results of estimation showed that specific energy consumption is associated with relative moisture
content and the grinding degree by nonlinear dependence according to the Kripichev-Kik grinding model for spruce
and pine bark. It has been established that the specific energy consumptionat grinding spruce and pine barking waste
at the optimum humidity of 25% and 27%, respectively, is proportional to the natural logarithm of the grinding degree. It was concluded that the wood waste grinding by 5–15 times requires higher energy consumption at optimum
moisture content, which is 5–10% and 7–14% of the heating value for spruce and pine, respectively. The knowledge
acquired through this research will contribute to developing possible approaches for wood waste recycling in a more
The work was carried out within the confines of the scientific school “Advances in lumber industry and forestry”.
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