Abstract
Fractional composition, as well as the temperature of the agglomeration process, affect the quality and mechanical properties of briquettes. In this research, shredded forest logging residues were investigated. Compaction tests were carried out for several specially prepared mixtures made of shares of fractions with different particle sizes. The moisture content, density of briquettes, specific work of compaction, mechanical durability, and biomass susceptibility to compaction were analyzed. Studies have confirmed the significant impact of the fractional composition of compacted biomass on its susceptibility to process parameters and the quality of the final product. Statistical analysis confirmed that the density of the briquette, its durability, the specific work of compaction, and the susceptibility of the tested biomass to compaction strongly depend on the particle size of the compacted biomass. An increase in temperature to 73 °C increased specific work by 40% and contributed to the high quality of briquettes in the range from 0.768 to 1.14 g·cm−3.
Highlights
The increase in human development causes an increase in energy demand in the modern world
Analysis of changes in the values of the examined density, specific work of compaction, durability of briquettes, and susceptibility to compaction showed that the fractional composition of compacted biomass had a major impact on these parameters
The highest densities were obtained for the mixture E (75% of fraction 0–1 mm and 25% of fraction 1–4 mm) for both temperature values. These values are consistent with the requirements of PN-EN ISO 17225-3 standard [52], which states that for briquettes made from logging residues the density should be greater than 0.9 g·cm−3
Summary
The increase in human development causes an increase in energy demand in the modern world. This can inflict many negative effects of energy production methods on the environment. The increasing consumption of fossil fuels from year to year has resulted in the emission of huge amounts of greenhouse gases and pollutants into the atmosphere. The protection of pure air and reduction of gases emitted to the atmosphere are very important for societies, of the European Union [2,3] but of all countries in the world. Support of renewable energy generation projects such as biomass, and promoting the transformation of the energy structure towards the diversification of these sources is crucial
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