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Desenvolvimento de sistemas dedicados de produção de biomassa lenhosa para ener...
Azevedo, João; Feliciano, Manuel; Amaral, Alexandra; Fonseca, Felícia; Pinto, M. Alice; Patrício, Maria do Sameiro; Nunes, Luís; Ribeiro, A.C.A biomassa lenhosa é vista actualmente com grande interesse nos mercados energéticos e agrícolas. Países como a Suécia ou os Estados Unidos têm vindo a desenvolver sistemas de produção intensiva de biomassa lenhosa com base em espécies de rápido crescimento, habitualmente Salix e Populus, e em sistemas de curta rotação. Em Portugal as culturas lenhosas de curta rotação (CLCR) para energia têm recebido pouca ate...
Desenvolvimento de sistemas dedicados de produção de biomassa lenhosa para ener...
Azevedo, João; Feliciano, Manuel; Amaral, Alexandra; Fonseca, Felícia; Pinto, M. Alice; Patrício, Maria do Sameiro; Nunes, Luís; Ribeiro, A.C.A biomassa lenhosa é vista actualmente com grande interesse nos mercados energéticos e agrícolas. Países como a Suécia ou os Estados Unidos têm vindo a desenvolver sistemas de produção intensiva de biomassa lenhosa com base em espécies de rápido crescimento, habitualmente Salix e Populus, e em sistemas de curta rotação. Em Portugal as culturas lenhosas de curta rotação (CLCR) para energia têm recebido pouca ate...
Sustainable woody biomass production systems: a novel solution for energy, agri...
Azevedo, João; Feliciano, Manuel; Amaral, Alexandra; Fonseca, Felícia; Pinto, M. Alice; Patrício, Maria do Sameiro; Nunes, Luís; Ribeiro, A.C.Bioenergy is a major current issue within the agriculture and energy sectors and the society in general. The environmental and social concerns raised by first generation biofuel crops increased the interest on woody biomass. Biomass production for direct conversion to heat and/or electricity is common in northern European countries, the USA, and, more recently, southern Europe, mainly based on short rotation wo...
The identification of unusual microscopic features in coal and their derived ch...
Valentim, B.; Lemos de Sousa, M. J.; Abelha, P.; Boavida, D.; Gulyurtlu, I.During the petrographic study of seven feed coals from different origins, it was found that these coals presented microfeatures such as: material size, shape, weathering, thermally affected particles and contamination. After devolatilization under fluidized bed conditions, some chars presented the consequences of the above mentioned microfeatures, i.e., unreacted coal, unswelled particles, coatings and microstr...
Combustion studies in a fluidised bed—The link between temperature, NOx and N2O...
Valentim, B.; Lemos de Sousa, M. J.; Abelha, P.; Boavida, D.; Gulyurtlu, I.Five commercially available high volatile bituminous coals from different origins were studied with the objective of characterizing their petrographic nature with respect to emissions of NOx and N2O. The chars produced [at temperatures ranging from 700 to 1000 °C] from these coals were also petrographically analyzed to assess the contribution of char to NOx and N2O formation during combustion. Vitrinite-rich co...
A study on coal blending for reducing NOx and N2O and levels during fluidized b...
Boavida, D.; Abelha, P.; Gulyurtlu, I.; Valentim, B.; Lemos de Sousa, M. J.The objective of the study was to investigate the effect of blending on the emissions of NOx and N2O during the fluidized bed combustion of five coals with different levels of nitrogen, volatile matter, and fixed carbon contents, and diverse coal and char petrographic composition. The devolatilization chars were produced in a fluidized bed combustor. Using the petrographic analyses of the coals, sixteen coal bl...
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