Researches regarding evaluation of energy consumption for manufacturing of pellets from vine pruning residues
2020
Tenu, I., University of Agricultural Science and Veterinary Medicine, Cluj-Napoca (Romania) | Rosca, R., University of Agricultural Science and Veterinary Medicine, Cluj-Napoca (Romania) | Carlescu, P., University of Agricultural Science and Veterinary Medicine, Cluj-Napoca (Romania) | Roman, C., Research Inst. for Analytic Instrumentation, Cluj-Napoca (Romania) | Senila, L.R. [and four others], Research Inst. for Analytic Instrumentation, Cluj-Napoca (Romania)
Renewable energy resources represent real prospects for replacing fossil fuels. Compared to other combustible materials (coal, oil etc.), biomass is widespread and can be found in various forms (wood, woody plants, aquatic, agricultural, waste etc.). Any country on the globe has the possibility and obligation to produce green energy from biomass. Biomass contributes with 14 % to global primary energy consumption, and for three quarters of the world’s population living in developing countries it is the most important source of energy. The researches of the present paper were aimed to evaluate the potential of biomass resulting from dry cutting of varieties of vines on the fruit and the energy consumed during the operations of milling, drying and manufacturing of pellets derived from it. All the operations were carried out with equipment designed and realized within the Laboratory of Mechanization of Agriculture, from the University of Agricultural Sciences and Veterinary Medicine “Ion Ionescu de Brad” from Iasi. Following the analyses performed, it was found that the higher calorific value of the vine pruning residues harvested and taken in the study was between 14.49−18.31 MJ•kgE−1, and the lower calorific power varies between 13.08 ... 16.88 MJ•kgE−1, depending on the variety. Considering the specific nature of the vineyard plantation, it turns out that the energy potential of the biomass harvested from one hectare has values between 8746.39 MJ•(kg•ha)E−1 and 13603.94 MJ•(kg•ha)E−1, equivalent to one quantity of firewood between 696.37 kg and 812.18 kg. Also, within this work, the energy requirements for conversion of vine pruning residues into densified biomass, as pellets, were evaluated. Thus, a total average electricity consumption of 0.5215−3.4959 MJ•kgE−1 was recorded, of which, for coarse chopping 0.0236−0.0306 MJ•kgE−1, for grinding particles larger than 4 mm, 0.0587 MJ•kg-1, for drying 2.692 MJ•kgE−1 and for pelletizing 0.4392 MJ•kgE−1.
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