Performance assessment of Brayton-biogas multigeneration system fed by the municipal wastes

Abstract

Increasing energy demands require evaluating all kinds of sources, such as biomass. Municipal waste was assessed as the primary biomass source in a two-stage digester tank system for effective biogas production. The produced biogas was later evaluated in a cogeneration system, including a Brayton power cycle and heating circuit for the residential and domestic hot water. Also, the generated heat was used to provide the necessary heat in the digester tanks for the available environmental biogas production conditions. The proposed system was thermodynamically evaluated through energy and exergy analysis. In this context, the energy and exergy efficiencies of the system were determined as 43.40 % and 41.25 %, respectively. The net power production of the system was determined as 876.83 kW. Thanks to waste heat energy, 1136 residences can be provided with hot water in summer, and 565 residences can be supplied with hot water and heating in winter.