Avaliação do desempenho energético e exergético de sistemas de cogeração a bagaço de cana em usinas sucroenergéticas

Abstract

This work presents the thermodynamic modeling of a bagasse-fired water-tube boiler with a steam production capacity of 41.67 kg/s (150 t/h), operating at 6,572.96 kPa and 480 °C. The boiler was divided into six control volumes, and both energy and exergy analyses were carried out based on the First and Second Laws of Thermodynamics. The results showed that the overall energy performance is consistent with values reported in the literature, while the exergy analysis revealed that the highest irreversibilities occur in the combustion chamber and heat exchangers. It is concluded that exergy evaluation complements traditional energy analysis by identifying the main sources of losses more accurately, thus supporting optimization actions for the system.