Energy, exergy, economy analysis and multi-objective optimization of SOFC/GT/SCO2 hybrid power system for ships based on zero-carbon emissions

LNG-powered ships have gradually become the mainstream of green shipping because of the high efficiency and emissions reduction, but cannot realize zero-carbon emissions operation. Therefore, a SOFC/GT/SCO2 hybrid power system for ships based on oxygen-enriched combustion carbon capture technology is proposed to achieve efficient and zero-carbon emissions operation for ships. The system is evaluated based on the thermoeconomic method, the effects of system operating parameters on system performance are investigated, and the system is optimized based on parametric analysis utilizing a multi-objective genetic algorithm. The results demonstrate that the higher operating temperature of the reformer increases the system net output power and reduces the system electricity production cost. The system net output power is maximized and the electricity production cost is minimized when the operating temperature of SOFC is 800 degrees C. For the SCO2 cycle, the selection of appropriate operating parameters is essential for the efficient operation of the system. The system achieves 7276.182 kW net power generation, 63.00% exergy efficiency, and 0.0774$/kWh electricity production cost after multi-objective optimization.