一种新型复合压缩空气储能系统的热经济学分析

To avoid the problems of the heat storage process in the compressed air energy storage system, reduce the generation of compression heat, and realize the efficient utilization of compression heat, a novel integrated compressed air energy storage system is proposed in this paper. The thermo-economic model of the system is established, and the thermodynamic and economic performance of the system under typical working conditions is studied. The influence law of key parameters on thermodynamic performance is analyzed, and the multi-objective optimization is carried out by the genetic algorithm. The results show that, under typical working conditions, the electrical-electrical efficiency and the exergy efficiency of the system are 63. 86% and 58. 18%, respectively, while air expander and pre-compressors have relatively high exergy destruction, accounting for 17. 3% and 15. 6% of the total exergy destruction, and the levelized cost of electricity for the system is RMB 1. 036/(kW · h). The sensitivity analysis shows that the optimal e-vaporation pressure exists in the Karina cycle to maximize the thermodynamic performance of the system. The system efficiency increases with the increase of the inlet pressure of the vessel, the maximum pressure of the reservoir, and the temperature of waste water, while the energy storage density of the system increases with the increase of the cyclic compression numbers linearly. The multi-objective optimization results reveal that the optimal exergy efficiency and levelized cost of electricity arc 59. 1% and RMB 0. 962/(kW · h), respectively. This paper presents a new solution for the design of the compressed air energy storage system, the system has a good prospect in the comprehensive utilization of industrial waste heat, and the analysis and optimization results can provide a theoretical basis for the engineering application of the proposed system.