Analysis and multi-objective optimization of SOFC/GT/SCO2 hybrid power system based on thermodynamics and economics

•A new hybrid power system based on solid oxide fuel cell is proposed.•Different arrangements of supercritical CO2 cycles affect system performance.•Evaluating the system from a thermodynamic and economic perspective.•Effects of some significant parameters on system performance is analyzed.•The mult...

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Vydáno v:Applied thermal engineering Ročník 232; s. 121033
Hlavní autoři: Xia, Minjie, Yao, Shouguang, Ying, Chao
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.09.2023
Témata:
Electricity production cost
Energy efficiency
Exergy efficiency
Multi-objective genetic algorithm
SOFC/GT/SCO2
SOFC/GT/SCO2
Multi-objective genetic algorithm
Electricity production cost
Energy efficiency
Exergy efficiency
ISSN:1359-4311
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Shrnutí:•A new hybrid power system based on solid oxide fuel cell is proposed.•Different arrangements of supercritical CO2 cycles affect system performance.•Evaluating the system from a thermodynamic and economic perspective.•Effects of some significant parameters on system performance is analyzed.•The multi-objective genetic algorithm is used to find the optimal design point. SOFC/GT hybrid power systems with the advantages of high energy efficiency and low emissions are important directions of energy research. This study proposes a new SOFC/GT/SCO2 hybrid power system, in which the SCO2 cycle is placed inside the SOFC/GT subsystem, and the waste heat of the SCO2 cycle is used for heating the air of the system to achieve good thermal matching between the system. After system construction, the system is thermodynamically and economically evaluated, and the influence of parameters on system operation performance is investigated. The system’s energy efficiency and the electricity production cost are optimized by a multi-objective genetic algorithm. The optimized net output power, energy efficiency, and exergy efficiency of the system are increased to 226.374 kW, 60.42%, and 63.03%, respectively, and the electricity production cost decreases to 0.079 $/kWh. Results show that placing the SCO2 cycle inside the SOFC/GT subsystem instead of at the tail can improve the energy efficiency of the system and effectively realize gradient energy utilization in the SOFC/GT/SCO2 hybrid power system.
ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2023.121033