纯氢补燃型和天然气补燃型压缩空气储能系统 特性与㶲经济性对比

[Objectives] The natural gas-fueled compressed air energy storage (CAES) system presents environmental pollution challenges, and replacing natural gas with hydrogen as fuel cannot cause greenhouse gas emissions. However, there is currently insufficient understanding of the technical and economic feasibility of the hydrogen-fueled CAES system, so it is necessary to carry out relevant research. [Methods] Based on exergy and exergoeconomic analysis methods, a comparative analysis is conducted on the thermodynamic performance, distribution of irreversible losses, economic factors, and exergoeconomic performance of the hydrogen and natural gas fueled CAES systems. In addition, the sensitivity of two parameters is also discussed. [Results] The hydrogen-fueled CAES system outperforms the natural gas-fueled CAES system in terms of discharge time, energy storage density, and exergy efficiency. Due to the higher cost of hydrogen compared with natural gas, the levelized cost per unit exergy of the product for the hydrogenfueled CAES system is $155.62/GJ, significantly higher than the corresponding cost of $27.57/GJ for the natural gas-fueled CAES system. In order to align the investment payback period of the hydrogen-fueled CAES system with the commercial competitiveness of the natural gas-fueled CAES system, the recommended selling price for electricity should reach $0.206 2/(kW h). Additionally, the hydrogen-fueled CAES system is more sensitive to parameter changes and can achieve better performance improvement and cost reduction under high parameter conditions. [Conclusions] The research results reveal the potential applications of the hydrogenfueled CAES system and provide a technical reference for its further commercial promotion.