Trasformazione del materiale ligno-cellulosico proveniente dal bosco in biocombustibili solidi: aspetti tecnico - economici di un impianto per la produzione di pellet e cippato
Author(s)
Guerrieri, Mirko
Date Issued
February 23, 2009
Type
Doctoral Thesis
Abstract
This work is the result of a technical and economic analysis about the process of
transformation of forest wood in biofuels, pellets and wood chips. The first phase of forest
biomass transformation is the chipping, which is realized through a woodchipper that reduces
wood into smaller parts, such as wood chips or sawdust. Thus, the product is sifted to separate
the thin part from the coarser one, and then is bagged. The production process of woodpellet is
more articulated: it is necessary to refine the mixture a bit more, creating a wood dust which is
immediately compressed to form the classical cylindrical pellet’s shape and to provide a uniform
dough-like mass. The study of the productivity of machinery employed in the transformation of
the wood material was made analyzing the cards compiled daily from the technicians of the pilot
plant. In these cards information about the amount of material worked in the unit time was
recorded. The economic evaluation has been completed following an analytical procedure
considering the hourly manpower cost and the single machines utilized in all the process phases.
In order to carry out this last analysis, various methodologies found in literature have been
considered and integrated with the information coming directly from machine operators. The last
part of the study concerns the evaluation of the real cost of production for every output and gives
some suggestions to improve the whole process of transformation and consequently to reduce
production costs.
Additional information
Dottorato di ricerca in Meccanica agraria
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