Peak-Shaving of the Oxy-Fuel Power Plant Coupled with Liquid O_(2)Storage  

作　　者：FU Xuchen WU Jianwen SUN Zhenkun DUAN Yuanqiang GAO Zhengping DUAN Lunbo 

机构地区：[1]Key Laboratory of Energy Thermal Conversion and Control,Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China [2]Inner Mongolia Power Research Institute Branch,Inner Mongolia Power(Group)Co.,Ltd.,Huhhot 010020,China

出　　处：《Journal of Thermal Science》2023年第5期1722-1736,共15页热科学学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(2022YFE0206600);the research project of Inner Mongolia Power Research Institute(2022-ZC-08)。

摘　　要：Integrating a high proportion of intermittent renewable energy provides a solution for the higher peak-shaving capacity of coal-fired power plants.Oxy-fuel combustion is one of the most promising carbon reduction technologies for coal-fired power plants.This study has proposed a novel oxy-fuel power plant that is coupled with both liquid O_(2)storage and cold energy recovery systems in order to adapt to the peak-shaving requirements.The liquid O_(2)storage system uses cheap valley electricity to produce liquid O_(2)for a later use in the peak period to enhance the peak-shaving capacity.Meanwhile,the cold energy recovery system has been introduced to recover the physical latent energy during the phase change of liquid O_(2)to increase the power generation in the peak period.Technical economies of three power plants,i.e.a 330 MW(e)oxy-fuel power plant as reference(Case 1),the same power plant coupled with only liquid O_(2)storage system(Case 2),and the same power plant coupled with both liquid O_(2)storage and cold energy recovery systems(Case 3),have been analyzed and compared.Thermodynamic performance analysis indicates that the peaking capacity of Case 3 can reach the range of 106.03 to 294.22 MW(e),and the maximum peak-shaving coefficient can be as high as 2.77.Exergy analysis demonstrates that the gross exergy efficiency of Cases 2 and 3 reaches 32.18%and 33.57%,respectively,in the peak period,which are significantly higher than that of 26.70%in Case 1.Economic analysis shows that through selling the liquid O_(2)and liquid CO_(2),combined with carbon trading,the levelized cost of electricity(LCOE)of the three cases have been greatly reduced,with the lowest one of 30.90 USD/MWh shown in Case 3.For a comprehensive consideration,Case 3 can be considered a future reference of oxy-fuel power plant with the best thermodynamic and economic performance.

关 键 词：OXY-FUEL peak-shaving liquid O_(2)storage cold energy recovery 

分 类 号：TM621[电气工程—电力系统及自动化]