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Contributo da petrografia para o conhecimento da causa do aumento das emissões ...

NOx emissions and unburnt carbon may suddenly increase in a thermoelectric power plant, without major chemical change in the feed coal. One way of investigate these situations is the petrographic analysis of the feeds and ashes, and the information integration. Three situations are presented in this study where coal contamination, fines, and maceral composition were, or may be, the cause for increase in NOx emi...

Discriminação de amostras de sedimentos para aplicação forense

A estrutura do carvão e do char: a sua relação com a mitigação dos gases de estufa

The results of projects POCI/CLI/60557/2004 and PPCDT/CLI/60557/2004 are summarized. The aim of these projects was the characterization of two coal sets (one vitrinite-rich increasing rank coal set; and one medium rank coal set with increasing inertinite volume) and their related char, and their relation with fluidized bed NO and N2O emissions

Parâmetros Raman de carvão e char produzido em leito fluidizado

In order to improve the understanding of the structure of char produced in a fluidized bed reactor reflectance and several Raman analyses were carried out on a set of coals with increasing rank and their char. The reflectance of the chares is discontinuous and related with coal rank. With the increasing of rank a general shift of the D band towards lower wavenumbers and an increase of the ID/IG intensity area r...

Estudo comparativo dos produtos da combustão natural e industrial dos carvões d...

The coal waste piles and fly ash piles that resulted from the combustion of the coal represent one of the most significant environmental impacts caused by exploitation and utilization of coal from Douro Coalfield. The organic petrography and geochemistry studies indicate the existence of similar petrographic features in samples and the occurrence of high combustion temperatures in coal waste piles. There is a s...

Variations in fly ash composition with sampling location: Case study from a por...

Base de dados de sedimentos para aplicações forenses

In order to build up a forensic database with the characteristics of the sediments and soils of the Portuguese mainland hundreds of beach and dune sediment samples were collected. The samples have been analyzed by several analytical techniques and several studies were undertaken to assess which are the properties best suited to the discrimination between areas and samples

Comparison of three differerent epidural analgesic protocols for pain relief af...