EXERGY EVALUATION OF THE USE OF POULTRY LITTER TO SUPPLY THE THERMAL LOAD OF AVIARIES
Alencar Migliavacca1; Silvio de Oliveira Junior1; Jurandir Itizo Yanagihara1
1 University of São Paulo
doi:10.20906/CPS/COB-2015-0722
Resumo
Evaluation of energy conversion processes based on exergy analysis takes into account the quantity and quality of transformed energy. This concept can be applied to the production chain of broilers chicken, contributing to a proper diagnosis of the main irreversibilities for improving energy efficiency and reducing environmental impact. Of all the waste generated by broilers chicken intensive production, poultry litter is distinguished by its quantity and pollution potential. Its use complementing or replacing firewood for heating aviaries can be a viable alternative, turning waste from the production process into energy input and raising sustainability levels. The objective of this study was to evaluate the potential of poultry litter as a feedstock for heating aviaries. From data about the calorific value and composition of the poultry litter and firewood varieties, the chemical exergy is calculated and the results are compared. The calculations consider the correlations presented by Kotas (1985) and obtained from solid fuel made up of Carbon, Hydrogen, Oxygen and Nitrogen. Results show strong exergy potential of chicken litter, especially with low moisture content, for replacing the firewood currently used for heating aviaries. Besides, chicken litter can be transformed into fuel, in the form of briquettes or pellets, to help mitigate the environmental impact caused by irregular deforestation and its misuse as fertilizer.
Palavras-chave: exergy analysis; poultry litter; heating of aviaries