Thermodynamic and economic analysis of a methanol fuel SOFC/GT/SCO2/ORC ship power system with coupled hollow fiber membrane carbon capture

In response to the urgent need for high-efficiency, energy-saving and zero-carbon emission in ship power systems, this paper proposes a SOFC/GT/SCO 2 /ORC hybrid ship power system architecture based on methanol fuel, and combines energy cascade utilization with a membrane separation carbon capture scheme configured under this architecture. The thermodynamic performance, economy and ship applicability (space and weight) of the constructed near-zero carbon emission ship hybrid system were analyzed, and compared with the same ship hybrid system architecture equipped with an oxy-fuel combustion carbon capture solution. The comparative analysis results show that the membrane separation carbon capture system is better than the coupled oxy-fuel combustion carbon capture system in terms of thermodynamic performance, economy and space compactness. Furthermore, a multi-objective genetic algorithm is used for the hybrid power system of the membrane separation carbon capture scheme, and multi-objective optimization is carried out with the system energy efficiency and investment cost as the objective functions, and the optimal solution is determined through the TOPSIS decision-making method. The optimization results show that the net output power of the system is significantly increased to 5413.66 kW, the energy efficiency reaches 66.29%, and the unit electricity cost is reduced to 0.0535 $/kWh. This research provides important technical solutions and theoretical support for the development of efficient, near-zero carbon ship power systems.