Abstract
Solid oxide fuel cell has become one of the most promising power generation methods today due to its diverse fuel sources, high efficiency, easy maintenance, and environmental friendliness. However, the exhaust gas temperature of the solid oxide fuel cell is still too high, and its direct emissions will cause a large amount of energy loss. To further improve the efficiency of the SOFC/GT system, a novel cascade waste heat recovery system is designed where the top cycle is the Brayton supercritical carbon dioxide cycle and the bottom cycle is the organic Rankine cycle. In order to better evaluate the performance of the system, this paper first carried out thermodynamic analysis of the subsystem respectively, and obtained the exergy flow process of the system. Then, an economic model is established for the entire system and calculated the annual total cost rate. The results are: the system efficiency can reach 73.97%, and the corresponding total cost rate of system operation is 36.25 $/MWh, reflecting excellent performance.
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