Publicação
Use of Acacia melanoxylon biomass residues from propagation control actions for pellets production
| Resumo: | The current world energy matrix is mainly based on fossil fuels, but for environmental and economic reasons, oil has been gradually replaced by other forms of renewable energy, e.g. wood pellets. The A. melanoxylon has high capacity for biomass production, the use of the invasive plant represents an alternative for the production of pellets, the valorization of biomass and the prevention of forest fires through the management of this fuel and public awareness of Acacia's mitigation. In addition to densifying the biomass, the torrefaction process also increases the energy density and calorific value of the pellets, making them more efficient. The main objective of the present work was to evaluate the effect of torrefaction on properties of A. melanoxylon pellets produced with different proportions (0, 25, 50, 75 and 100 %) of torrefied (TT) raw material. Physical characterization of pellets (0, 25, 50, 75 and 100 %) such as apparent density (166.44, 183.66, 186.24, 196.72 and 216.22 kg/m3, respectively) and mechanical durability (91.2, 89.6, 92.4, 95.7 and 94.7 %, respectively) were carried out. The chemical difference between pellets (0, 25, 50, 75 and 100 %) were evaluated through a summative analysis, to obtain the composition of ash (0.5, 0.8, 0.8, 0.8 and 0.7 %, respectively), lignin (28.75, 27.87, 27.85, 31.55 and 33.47 %, respectively), extractives (10.2, 11.5, 12.4, 14.3 and 15.3 %, respectively) and polysaccharides (66.81, 64.81, 61.00, 56.77 and 57.44 %, respectively). The calorific value of the different compositions of the pellets was also determined (19.45, 19.53, 19.88, 20.25 and 20.64 MJ/kg, respectively) It was noticed that the best quality pellets were produced with 100 % torrefaction biomass. When analyzing the values and standards, we can also justify the use of pellets with only 75 % torrefied biomass, given that these, in general, meet the requirements of international product quality standards. |
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| Autores principais: | Góis, Isa Maria Bernardino |
| Assunto: | Agroforestry wastes Renewable energy Biomass compaction Heat-treated wood Biofuel Resíduos agroflorestais Energias renováveis Compactação de biomassa Madeira tratada termicamente Biocombustível |
| Ano: | 2022 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | The current world energy matrix is mainly based on fossil fuels, but for environmental and economic reasons, oil has been gradually replaced by other forms of renewable energy, e.g. wood pellets. The A. melanoxylon has high capacity for biomass production, the use of the invasive plant represents an alternative for the production of pellets, the valorization of biomass and the prevention of forest fires through the management of this fuel and public awareness of Acacia's mitigation. In addition to densifying the biomass, the torrefaction process also increases the energy density and calorific value of the pellets, making them more efficient. The main objective of the present work was to evaluate the effect of torrefaction on properties of A. melanoxylon pellets produced with different proportions (0, 25, 50, 75 and 100 %) of torrefied (TT) raw material. Physical characterization of pellets (0, 25, 50, 75 and 100 %) such as apparent density (166.44, 183.66, 186.24, 196.72 and 216.22 kg/m3, respectively) and mechanical durability (91.2, 89.6, 92.4, 95.7 and 94.7 %, respectively) were carried out. The chemical difference between pellets (0, 25, 50, 75 and 100 %) were evaluated through a summative analysis, to obtain the composition of ash (0.5, 0.8, 0.8, 0.8 and 0.7 %, respectively), lignin (28.75, 27.87, 27.85, 31.55 and 33.47 %, respectively), extractives (10.2, 11.5, 12.4, 14.3 and 15.3 %, respectively) and polysaccharides (66.81, 64.81, 61.00, 56.77 and 57.44 %, respectively). The calorific value of the different compositions of the pellets was also determined (19.45, 19.53, 19.88, 20.25 and 20.64 MJ/kg, respectively) It was noticed that the best quality pellets were produced with 100 % torrefaction biomass. When analyzing the values and standards, we can also justify the use of pellets with only 75 % torrefied biomass, given that these, in general, meet the requirements of international product quality standards. |
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