Abstract
The nonhomogeneous physical properties of the raw material in the form of shredded logging residues, and its composition may cause a serious problem in its further use. As a result of conducted research, it was found that the elemental composition of logging residues (low nitrogen and ash contents) is suitable for raw materials dedicated to energy use. The possibility of using this raw material for the production of briquettes and the correlation between the physical properties of the final product and the parameters of the raw material and the briquetting process were also determined. The material used for tests was wood chips with moisture contents of 10%, 15%, 20%, compacted in a closed chamber at the temperatures of 22, 73 and 103 °C at unit pressures of approx. 65 MPa. The best results were obtained for the material moisture content of 10%. It was found that the temperature of the wood chips during agglomeration influences the degree of compaction and durability of the obtained briquettes. It is more advantageous to conduct compaction at a higher temperature. The research also determined the effect of the fractional composition of the briquetted mixture divided into size groups 0–1, 1–4, 4–8, and 8–16 mm, its moisture and temperature of the process on the durability of the product. On the basis of the obtained results, the most favorable fractional composition of the briquetted mixture, its moisture and temperature of the compaction process were determined.
Highlights
Recent years have been a time of increasing demand for biomass used as a raw material for the production of liquid and gaseous fuels, intended for direct combustion or for the production of refined fuels in the form of briquettes or pellets
On the basis of the conducted research, it was found that the elemental composition of the tested biomass differs from the composition of other compared raw materials
It is advantageous for a raw material for the production of solid fuels
Summary
Recent years have been a time of increasing demand for biomass used as a raw material for the production of liquid and gaseous fuels, intended for direct combustion or for the production of refined fuels in the form of briquettes or pellets. One type of biomass that has not been fully used so far are logging residues and by-products of the forestry production processes. The logging residues are the material that is created during the harvesting of thick wood, as well as during the maintenance and cleaning of forest stands. A solution that reduces the risk of fire, cleans the surface, preparing it for afforestation and at the same time does not impoverish the soil, is to crush the residues and mix them with the top layer of soil. Apart from pure, white wood, it contains a large amount of bark, pine needles and unlignified young shoots
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