Abstract
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 consumption at 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 energy-efficient way.
Highlights
The technological cycle of wood production assumes a large amount of wood residues during main production
During processing the experimental data results it has been established that the mathematical model linking the relative moisture content W [%] of the barking waste and the degree of its grinding i with the specific energy consumption of the grinding QGRIN [MJ/kg] can be expressed by the formula, which repeats the structure of the Kirpichev-Kik’s grinding law: where a0 and a1 are coefficients, namely a0 = 1.43 MJ/kg and a 1
Evaluation of energy consumption required for grinding the spruce and pine barking waste showed that the specific energy consumption correlates with the relative moisture content and the grinding degree by nonlinear dependence, which repeats the structure of the Kirpichev-Kik’s grinding law in both cases
Summary
The technological cycle of wood production assumes a large amount of wood residues during main production (sawdust, cuttings, bark, limbs, etc.). The volume of wastes by logging and woodworking is much more than 50% of the total volume of harvested or processed wood [1]. Main production wastes include the tops of trees, brushwood, branch wood, butts, and debris. In Russian woodworking companies, most logging waste is used for strengthening skidding trails or building haul-roads [2]. Most of the waste constitutes cuttings, slabs, wood strips, and bark. Wood residues in the main woodworking plants are used as fuel for boiler plants or processed to produce fuel briquettes and pellets [4,5]
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