High-efficiency thermoeconomic approach for multi-generation at Afyon biogas power Plant: Electricity, liquid hydrogen, liquid carbon dioxide and hot water

Abstract

This study proposes a high-efficiency multi-generation model for the Afyon Biogas Power Plant (ABP), which has a 4000 kW electricity generation capacity. In addition to electricity production, the proposed model integrates energy systems for heating, carbon dioxide liquefaction, hydrogen production and liquefaction, and hot water production. A comprehensive thermodynamic and thermoeconomic analysis of the system was conducted in coordination with Engineering Equation Solver (EES) and Aspen Plus. The thermodynamic results indicate that the ABP's energy efficiency, exergy efficiency, and useful energy are 14.29 %, 12.52 %, and 4000 kW, respectively. With the proposed model, these values achieve 75.05 %, 93.45 %, and 21,013 kW. The highest exergy destructions occur in the combustion chamber and HEX-2. The thermoeconomic results indicate that the unit costs of electricity, hydrogen production, hydrogen liquefaction, liquid hydrogen, carbon dioxide liquefaction, and hot water are calculated as 65.7 $/MWh, 2.64 $/kg, 2.754 $/kg, 5.394 $/kg, 0.36 $/kg, and 2.358 $/MWh, respectively. The proposed system's total equipment purchase cost is 22,126,876 $. These findings demonstrate that the proposed multi-generation model significantly enhances ABP's efficiency and economic feasibility by effectively utilizing exhaust gas waste energy and integrating energy systems.