To enhance energy utilization efficiency and reduce carbon dioxide emission,a hybrid power system based on hydrogen,heat,and electricity co-generation in a gas plant is proposed.Through thermodynamic and economic analysis on the system,it is revealed that the energy efficiency and exergy efficiency can reach 74.60％and 64.47％,respectively,both higher than the fuel cell-gas turbine system under research and development.Among various subsystems,the fuel cell contributes the most to the total energy output power(88.59％),yet also incurs the highest exergy loss,accounting for 51.74％.However,the relative exergy losses of the water electrolysis and compressed air energy storage subsystems are comparatively lower.The compressed air energy storage unit's control range for peak shaving spans from 85％to 115％,and the electrolysis unit produces hydrogen at a rate of 0.41 kmol·h-1,enhancing the system's peak shaving capacity.Moreover,the proposed system demonstrates low carbon dioxide emission of 0.08 to 0.10 t·GJ-1,indicating minimal environmental impact.Considering discount rates and other factors,the investment cost of this project can be recovered within 3.66 years(including a 1-year construction period),with a net present value of 1.107 million U.S.dollars.Therefore,this proposed approach also exhibits a certain economic advantage.
维普
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