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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...
Characterization of Coal Maceral Groups by Micro-Raman Spectroscopy
Valentim, B.; Guedes, A.; Prieto, A. C.; Lemos de Sousa, M. J.Comunicação apresentada no 7º Congresso de Geoquímica dos Países de Língua Portuguesa, Maputo (Moçambique), Setembro 2003. ; Uma caracterização rápida e não-destrutiva da organização estrutural do material carbonoso pode ser conseguida através da espectroscopia micro-Raman, uma vez que podem ser obtidos espectros de áreas micrométricas. Uma aplicação óbvia desta técnica é a caracterização pontual de macerais d...
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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