Comparative assessment of the various split flow supercritical CO2 Brayton cycles for Marine gas turbine waste heat recovery

Authors : Serpil ÇELİK TOKER

Pages : 251-271

Doi:10.58559/ijes.1295781

View : 28 | Download : 31

Publication Date : 2023-06-23

Article Type : Research Paper

Abstract :Supercritical CO2 Brayton cycle insert ignore into journalissuearticles values(sCO2 BC); can become easily utilized in marine gas turbine waste heat recovery applications due to their high efficiency, compact size, and low-cost advantages. In this study, the performance of the three different split flow sCO2 BCs, including turbine split flow-1 insert ignore into journalissuearticles values(TSF-1);, turbine split flow-2 insert ignore into journalissuearticles values(TSF-2);, and turbine split-3 insert ignore into journalissuearticles values(TSF-3);, for the recovery of marine gas turbine waste heat is compared. The Engineering Equation Solver insert ignore into journalissuearticles values(EES); application is used to compare the three different split flow sCO2 BCs\` performances. Moreover, to investigate the influence of important thermodynamic parameters on cycle performance, a parametric analysis is carried out. The effect of variable exhaust gas temperature, turbine input pressure, and compressor inlet pressure on net power, the energy efficiency of the system, system\`s exergy efficiency, and exergy destruction are examined. The results suggest that the energy efficiencies of the TSF-1 sCO2 BC, the TSF-2 sCO2 BC, and the TSF-3 sCO2 BC are calculated by 28.71%, 34.5%, and 29.42%, respectively. The TSF-2 sCO2 BC has more advantages in efficiency among all the cycle layouts while the TSF-3 sCO2 BC layout has better performance in the net power. In addition, the TSF-3 sCO2 BC has the highest exergy destruction at 99.71 kW, followed by the TSF-1 sCO2 BC at 91.83 kW and the TSF-2 sCO2 BC at 41.75 kW. It has been determined that the cycle\`s net power increases with rising exhaust gas temperature and turbine input pressure and decreases with compressor input pressure. Exhaust gas temperature and turbine inlet pressure have a positive effect on the performance of all split flow sCO2 BCs.
Keywords : Marine gas turbine waste heat recovery, Supercritical CO2 Brayton cycle, Thermodynamic analysis