Performance Analysis of Novel Supercritical Compressed Carbon Dioxide Energy Storage Systems Integrated with Tower Solar Energy
With the rapid development of renewable energy,energy storage technology plays a vital role in realizing large-scale grid connection of renewable energy.Compared with compressed air energy storage system,compressed supercritical carbon dioxide energy storage system has the advantages of small size and high energy storage density.In this paper,two supercritical compressed carbon dioxide energy storage(SC-CCES)systems with simple regenerative compression cycle and recompression cycle integrated with tower solar energy are proposed,and thermodynamic analysis and economic analysis are carried out.Compared with the SC-CCES reference system integrated with tower solar energy,the SC-CCES systems of simple regenerative compression and recompression cycle of integrated tower solar energy are more conducive to improving the solar energy utilization rate,and their photoelectric conversion efficiencies are 23.56%and 28.77%,respectively,2.63%and 7.84%higher than that of the reference system.Increasing the energy storage pressure and energy release pressure can effectively improve the energy efficiency,photoelectric conversion efficiency,energy efficiency and energy storage per unit volume of the system.In addition,the recompression SC-CCES system integrated with tower solar energy has good economic performance.The dynamic investment recovery period is about 6 to 7 years.The 20 year net present value(NPV)is $23 456.16×103,$7 956.69×103 higher than that of the coupled simple regenerative compression system,and the internal rate of return(IRR)is 17.55%.
compressed carbon dioxide energy storagethermodynamic analysiseconomic analysissolar power tower plantBrayton cycle
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