Comprehensive Analysis of the Hybrid SOFC-SCO_۲-ORC Power System: Thermodynamics, Exergy, Economics, and Optimization

With the rise in worldwide demand and the reduction of fossil resources, renewable energies are gaining increasing importance. The use of fuel cells and supercritical carbon dioxide cycles increases the capacity of the system in power production and reduces greenhouse gases. This article models and introduces two hybrid cycles. The first system integrates a solid oxide fuel cell, gas turbine, organic Rankine cycle, and supercritical carbon dioxide cycle, while the second system includes fuel cells, a gas turbine, and a supercritical carbon dioxide cycle. The performance of both systems undergoes comprehensive analysis, with results evaluated based on thermodynamic, exergy, economic, and optimization principles. The effect of various parameters, including compressor pressure ratio, turbine inlet temperature, fuel cell inlet temperature, and fuel mass entering the system, on the energy and exergy efficiency of the system, total system production power, levelized costs, total cost, and system optimization has been investigated. For the sensitivity analysis, we determined the variation rules of the components and system parameters for Fuel flow ratio and fuel cost. The data suggest that for the first system (case a), the highest energy efficiency recorded was ۶۹%, with exergy efficiency reaching ۷۳%. Additionally, the second system (case b) demonstrates energy and exergy efficiency under design conditions of ۶۱% and ۶۵%, respectively. Also, the results of the economic analysis show that the total cost rate for the first system (case a) will be ۱۱.۰۶ /h and for the second system (case b) ۷.۰۷ /h. The optimal case yields maximum energy and exergy efficiencies, as shown by the optimization results, which are ۶۹.۲۲% and ۷۴.۰۵%, respectively. Additionally, the lowest levelized cost is ۲۶.۱۳ /MWh, and the total cost rate is ۱۱.۲۵ /h in the first system. But in the second system, energy efficiency, exergy efficiency, the lowest levelized cost, and the total cost rate are %۵۴.۱۶, %۵۷.۹۴, ۲۳.۷۹ /MWh, and ۷.۳ /h, respectively.

کلیدواژه ها:

Solid oxide fuel cell ، Systems modeling ، Optimization ، exergy efficiency