Análise exergoeconomica da geração de biogás a partir da vinhaça

Abstract

The present study aims to present an exergoeconomic analysis of biogas generation from vinasse, searching in the literature for data on exergy analysis of vinasse biogas combined with data from an economic evaluation of the same biogas. This combination sought to identify optimizations in the process through the exergy costs of the components. Exergy analysis is based on the second law of thermodynamics, highlighting the quality of the energy produced by the thermal system. This analysis is the pillar of the exergoeconomic study. The application of the SPECO method, developed by Valero and Lozano, seeks to quantify the costs of fuels and products generated through the principles of fuel (F) and product (P). The exergoeconomic study analyzes the costs of the exergy and monetary flows of each component of the anaerobic digestion plant. This analysis highlighted the significant costs of the UASB reactor, mainly due to exergy destruction 0.107 R$/s and operating costs 76.74 R$/s. The pump and cooling tower had lower economic impacts, with exergoeconomic factors below 1.2%. The results point to exergy destruction as the main factor for exergy cost, requiring optimization through new technologies or addition of other organic materials. The system is technically feasible, with its economic viability depending on these reductions in exergy losses.