Abstract
The objective of this study was to assess the energy value of waste timber in the form of sawdust. Two types of wood: Araucaria (Araucaria angustifolia) and Pinus were evaluated with no defined species (Pinus sp). The sawdust was collected from a timber that receives wood from reforestation of these species in Southwestern Parana, Brazil. The material collected was evaluated with a calorimeter bomb to determine the gross and net calorific value. The main results obtained led to the conclusion that the sawdust of A. angustifolia showed gross calorific value of 17.32 MJ.kg-1 and net of 17.00 MJ.Kg-1, respectively, and Pinus sp. gross calorific value of 17.23 and net of 16.91 MJ.Kg-1, respectively. Key words: Wood energy, conifer of reforestation, gross calorific value.
Highlights
Forest biomass is a low cost and abundant energy source (Almeida, 2010)
The average values for the higher calorific value of 17.32 were MJ.Kg-1 for A. angustifolia and 17.23 MJ.Kg-1 for Pinus sp. mean values from conifers, but which exhibit discrepancy observed in the ranges of values between one species and another (Figure 3)
The net calorific value found by indirect method was 17.00 MJ.Kg-1 for A. angustifolia and 16.91 MJ.Kg-1 for Pinus sp. (Figure 4)
Summary
Forest biomass is a low cost and abundant energy source (Almeida, 2010). When compared with the other non-renewable sources, it has storage advantage, because it can be stored for later use during periods when it becomes necessary (Fowler, 2009).Used for energy production, biomass can be classified into: Primary- from the forest or agriculture cultivated with energy purpose; Secondary- resulting from primary biomass, including agricultural, forestry and byproducts residues (Carneiro, 2012).Forest residues are those tree parts such as stems, bark, stumps, leaves which are damaged and unmarketable in the timber manufacturing industry (Karaj et al, 2010). Forest biomass is a low cost and abundant energy source (Almeida, 2010). Used for energy production, biomass can be classified into: Primary- from the forest or agriculture cultivated with energy purpose; Secondary- resulting from primary biomass, including agricultural, forestry and byproducts residues (Carneiro, 2012). Forest residues are those tree parts such as stems, bark, stumps, leaves which are damaged and unmarketable in the timber manufacturing industry (Karaj et al, 2010). Residues from agriculture and silviculture (including timber processing) apart from being a sustainable source of alternative energy for rural development, can serve as future supply of bioenergy which do not direct or indirectly have negative impacts on the environment (Scarlat, 2011).
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