Performance Analysis and Multi-Objective Optimization of a Molten Carbonate Fuel Cell-Braysson Heat Engine Hybrid System
- 物理技术－专著 
A new hybrid system consisting of a molten carbonate fuel cell (MCFC) and a Braysson heat engine is established, in which multi-irreversibilities resulting from the overpotentials in the electrochemical reaction, heat leak from the MCFC to the environment, non-perfect regeneration in the regenerator, and finite-rate heat transfer in the Braysson heat engine are taken into account. Analytical expressions for the efficiency and power output of the hybrid system are derived through thermodynamic-electrochemical analyses, from which the general characteristics of the system are revealed and the optimum criteria of some of the main parameters such as the current density, efficiency and power output are given. The influence of the irreversible losses on the performance of the hybrid system is discussed. Moreover, a multi-objective function including both the power output and efficiency is introduced and used to further subdivide the parametric optimum regions according to different requirements which are often faced in the design and operation of practical fuel cell systems. The results obtained here are very general and may be directly used to derive the variously interesting conclusions of the hybrid system operated under different special cases.