Technical and economic analysis of combined heat,electricity and hydrogen supply system by solar driven solid oxide cell system
Solid oxide cells have the ability to switch between electrolysis and fuel cell power generating modes,and operate at 650～850℃,resulting in high-grade waste heat.The equipment utilization ratio and energy utilization efficiency can be significantly increased by using the cell for the tri-generation of heat,electricity,and hydrogen.A photovoltaic and concentrated solar heat driven solid oxide cell system for tri-generation system of heat,power,and hydrogen is presented,and molten salt thermal storage system and batteries are coupled to ensure continuous and stable operation of solid oxide cell.By taking the lowest total cost as the object,a mixed integer linear programming model for system capacity configuration and operation strategy optimization is constructed.Moreover,based on the energy consumption principle of cascade utilization,the pinch analysis approach is applied to maximize the cascade use of multi-grade energy flows throughout the entire system,providing an efficient mechanism for integrating mass and energy in coupled systems.For a real case of solar energy resources and heat,electricity,hydrogen requirement in an industrial park,the coupled system's levelized energy cost is 0.28 yuan/kW,and the annual full load operating hours of the solid oxide cell reaches over 6000 h.
reversible solid oxide cellcombined heat,power and hydrogen supplyenergy cascade utilizationphotovoltaicconcentrated solar heat
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