Natl Agr Univ La Molina UNALM, Renewable Energy Lab LER, Ave La Molina S-N, La Molina, Peru|Fed Univ Itajuba UNIFEI, Inst Mech Engn IEM, Excellence Grp Thermal Power & Distributed Genera, Ave BPS 1303, BR-37500903 Itajuba, MG, Brazil;Fed Univ Itajuba UNIFEI, Inst Mech Engn IEM, Excellence Grp Thermal Power & Distributed Genera, Ave BPS 1303, BR-37500903 Itajuba, MG, Brazil;Fed Univ Itajuba UNIFEI, Inst Mech Engn IEM, Excellence Grp Thermal Power & Distributed Genera, Ave BPS 1303, BR-37500903 Itajuba, MG, Brazil;Cuban Inst Sugarcane Derivat Res ICIDCA, Via Blanca & Carretera Cent 804,AP 4036, Havana, Cuba;Fed Univ Uberlandia UFU, Incubat Ctr Social Solidar Enterprises CIEPS, Ave Joao Naves de Avila,2121,Campus Santa Monica, BR-38400902 Uberlandia, MG, Brazil;
Velasquez Pinas, Jean Agustin;Venturini, Osvaldo Jose;Silva Lora, Electo Eduardo;Almazan del Olmo, Oscar;Calle Roalcaba, Orly Denisse;
Agricultural biogas plants are becoming attractive in several countries, mainly due to the possibility of obtaining additional incomes by selling energy to electrical grid. However, specific conditions under which biogas plants would be economically viable are not yet well known. This paper presents results of analysis made to find optimal sizes of biogas plants in terms of electrical capacity. They were evaluated based on economic models of centralized and decentralized technological schemes and their respective mono-digestion and co-digestion systems of cattle manure, maize silage and grass silage as feedstock, for electricity generation capacities between 100 and 1000 kWe. Results show that biogas plants using mono-substrates such as cattle manure present economic viability for electrical power higher than 740 kWe. Co-digestion system presents economic viability for electrical power higher 1000 kWe. Finally, public policies related to development of these technologies, mainly in the form of subsidies, such as those existing in developed countries, could help to make the co-digestion agricultural biogas plants economically viable for the Brazilian scenario. The novelty of the paper consists in the determination of the optimum size of mono- and co-digestion patterns for Brazilian conditions showing as results the necessary level of subsidies and the paths to economic viability. (C) 2019 Elsevier Ltd. All rights reserved.
Agricultural biogas plant;Optimal size;Economic model;Cattle manure;Maize and grass silage;Mono and Co-Digestion pattern;