新型超临界CO_(2)光火互补发电系统多目标优化

Multi-objective Optimization of a Novel Supercritical CO_(2)Solar-fossil Complementary Power Generation System

光热发电与常规火电联合运行有利于改善出力情况,为最优化联合运行,提出了一种新型超临界CO_(2)光火互补发电系统,大比例提高了太阳能输入占比,同时针对太阳倍数和储热容量提出了一种经济-环境优化方法,并对系统最佳参数进行了敏感性分析。结果表明,随着太阳倍数和储热容量增大,互补系统的CO_(2)排放率下降,而净现值存在最佳点。经济-环境优化方法可进行经济性和环境性能的同步优化,有利于提高系统全生命周期的净现值,降低CO_(2)排放,为光火互补电站的系统设计提供了重要的参考依据。此外,敏感性分析表明,降低镜场和储热成本,提高光热电价,有利于互补发电系统的发展。

The combined operation of solar thermal power generation and conventional thermal power generation is conducive to improving output conditions.To optimize the combined operation,the paper proposes a novel S-CO_(2)solarfossil complementary power generation system,which could significantly increase the proportion of solar energy input.In addition,it also proposes an economic-environmental optimization method for solar multiple and thermal energy storage capacity and takes the sensitive analysis for the optimal parameters of the system.The results show that the CO_(2)emission rate of the complementary system decreases,and there is an optimal net present value as the solar multiple and thermal energy storage capacity increase.The economic-environmental optimization method can simultaneously optimize the economic and environmental performance,which is beneficial for improving the net present value of the system,reducing CO_(2)emission,and providing important reference for the system design of solar-fossil complementary power plants.In addition,sensitive analysis shows that reducing heliostat field and thermal energy storage costs and increasing electricity price of solar power are helpful for developing the complementary power generation system.