Supercritical CO2 Power Cycle and Ejector Refrigeration Cycle for Marine Dual Fuel Engine Efficiency Enhancement by Utilizing Exhaust Gas and Charge Air Heat

Dual fuel engines with LNG as have become a feasible solution for ship power units in the current situation, but their efficiency needs to be further enhanced meet increasingly stringent emission requirements. This paper designs dual-loop system, including supercritical CO2 cycle and thermally driven ejector refrigeration cycle, recovering exhaust gas charge air heat of marine dual engine. The models waste recovery evaluation indicators combined genetic algorithm optimization program are developed. Compared standalone machine, system can improve by about 9.3% engine’s efficiency. performance analysis shows that contributes highest share exergy destruction accounts approximate 53% cycle. There optimal values compressor inlet temperature 8.1 MPa turbine 305 °C. Finally, after optimization, specific consumption, efficiency, emissions around 137.9 g/kWh, 53.3%, 537.4 respectively. It provides which cooler wholly replaced