Research On Thermal Performance And Economy For Adiabatic Compressed Air Energy Storage System

Compressed air energy storage technology(CAES)can not only solve the grid connection difficulties of renewable energy,but also balance the demand load of the grid.All of those advantages make the CAES becoming one of the most promising energy storage technology.Recently,advance adiabatic compressed air energy storage technology(AACAES)is attracted as a new type technology of recovering compressed heating.However,the current lack of research on the thermodynamic process optimization and technical economy of the AA-CAES has led to restrictions on its commercial investment projects.Therefore,this paper has carried out research on the thermal performance and economics of the AA-CAES.The main research contents and conclusions are as follows:Firstly,the traditional AA-CAES is used as the object,and the thermodynamic model of each component is established.Based on the first and second laws of thermodynamics,the thermodynamic performance is studied,and the main components caused by exergy loss are clarified.On this basis,an improved AA-CAES scheme was proposed,and the effect of heat exchanger efficiency,minimum discharge pressure of air storage chamber and ambient temperature on the improvement scheme was studied.Thermodynamic analysis shows that the overall efficiency of the improved AA-CAES is relatively improved by 1.07%.Subsequently,the economic model of the improved AA-CAES was established,including the power station economic model and the system thermal economic model.Taking the fixed-capacity energy storage power station and the electricity price policy in specific areas as the object,the investment cost of the power station,the investment rate of return,the internal rate of return,the static investment payback period and the dynamic investment payback period are estimated.The exergy loss cost of compression subsystem,expansion subsystem,gas storage subsystem and heat storage subsystem are analyzed.Moreover,the exergy economic cost of the input and output of the AA-CAES are contracted.Finally,it quantifies the impact of energy policies,electricity prices,and annual operating days of the power station on the investment economy of the project,which is beneficial to control and evaluate the risk of investing in AA-CAES power stations.