Abstract
A new molten carbonate fuel cell based combined cycle is proposed and analysed in detail from the viewpoints of exergoeconomics. The system utilizes methane as a fuel and makes use of liquid natural gas cooling effect as a heat sink. The system performance is simulated using the conservations of mass and energy as well as the exergy and cost balances. By considering different organic fluids for each stage of the cascade organic Rankine cycle, it is observed that the best performance is achieved with using toluene and n-pentane for the top and bottom organic Rankine cycles, respectively. It is observed that the highest and second highest exergy destructions occur in the after burner and fuel cell, respectively. Parametric studies are performed to specify the decision parameters prior to optimization process. Performance optimization is accomplished in order to minimize the sum of product cost (SUPC), case A; and to maximize the exergy efficiency, case C. The results show that the highest exergy efficiency is obtained as 67.96% and the lowest produced power unit cost is calculated as $32.09/GJ. Performing a multi objective optimization for the system resulted in an exergy efficiency of 66.56% and a SUPC of $33.57/GJ, case B.
Published Version
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