The use of biomass is increasingly important for clean energy
generation from renewable sources. An important aspect is the
need to increase the density of several wood waste forms, mainly
from agriculture and forestry, which have generated a growing
industry in Europe, Canada and the United States that is capable of producing about 10 million tons of biomass pellets per year.
One of the main problems facing the pellets industry is the fact that
the vast majority of these are being produced from logging companies
waste; this will generate a shortage as the industry does not
have the capacity to generate sufficient waste to meet the global
demand for biomass pellets, so the development of pellets from
agricultural and forestry waste, as well as other different types of
biomass will be of particular interest in the near future. Currently
the use of biomass pellets occurs through direct combustion processes.
However, the evaluation of each individual stage of the
combustion process is very important when developing models
of the overall process, due to the large number of variables
involved, as it was possible to see in this paper. This evaluation
and the use of mixed biomass pellets are issues yet unexplored
in Portugal, and are thus subjects that require further research
and analysis.