Research On Advanced Adiabatic Compressed Air Energy Storage Based On Organic Rankine Cycle

In Chinese power system,thermal power generation occupies the main position.For the healthy and sustainable development of China’s economy,the development and utilization of renewable energy,such as wind energy and solar energy,are paid more attention.However,renewable energy has the characteristics of instability and intermittence,and can only generate electricity in some specific time period.Therefore,the grid connection of renewable energy increases the peak load regulation pressure of power grid.Advanced adiabatic compressed air energy storage technology(AA-CAES)is a new large-scale energy storage technology,which can alleviate the peak load regulation pressure of power grid.Therefore,the application of large-scale compressed air energy storage system is of great significance.According to the basic principle of advanced adiabatic compressed air energy storage technology and the thermodynamic model of each key component of the system,a 10MW/100MWh advanced adiabatic compressed air energy storage system is designed.The charging and discharging efficiency of the system is 50.6%.By analyzing the simulation results of the system,it is found that after the energy release process of the system is completed,some of the heat storage medium will remain,and the heat of compression stored in it cannot be fully utilized.In order to make better use of this energy,an advanced adiabatic compressed air energy storage system combined with organic Rankine cycle(ORC)is proposed.The working medium most suitable for 10MW advanced adiabatic compressed air energy storage system is selected from six kinds of common ORC circulating working medium to maximize the use of the waste heat of the energy storage system.After adding the orc structure,the net output of the system in the process of energy release can be increased by 179kW.Finally,the paper analyzes the key components of 10MW advanced adiabatic compressed air energy storage system,calculates the exergy loss of each component in the system,and obtains the cause of exergy loss of the system through the analysis and calculation results.