Abstract
It is estimated that about 3.5 million green tons of forest residues are available each year in Portugal for energy utilization. This corresponds to 13 million barrels of oil, i.e., 48 % of all the oil imported in 1984 in Portugal. One of the major problems associated with the utilization of forest wastes as a fuel is its moisture content, which can be as high as 80 – 100 % (dry basis). As a consequence, its heat value is very low, 8300 KJ/Kg, say. However, if they were dry (15 %, say) this value would increase to around 16000 KJ/Kg, i.e., almost twice as much. Thus, it becomes necessary to dry these forest wastes before burning them.
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