Performance optimization of adiabatic compressed air energy storage with ejector technology

• CAES technology can improve electricity quality of wind power and solar power.
• Adiabatic CAES technology has the advantage of zero natural gas consumption.
• Ejector was integrated to adiabatic CAES system to recover pressure reducing loss.
• Application of ejector achieved an efficiency increase of 3.41% for adiabatic CAES.
• Energy conversion efficiency of the optimized adiabatic CAES reached 65.36%.

In this paper, the performances of two adiabatic compressed air energy storage systems were determined. In system 1#, compressed air was reduced directly from 6.40 MPa to 2.50 MPa. In system 2#, compressed air was first reduced to 5.00 MPa and was later adjusted to 2.50 MPa by an ejector under an ejecting coefficient of 0.45. The mass flow of turbine 1# increased by 45%, and its power output capacity increased from 3.80 MW to 5.51 MW. The energy conversion efficiency of system 2# increased to 65.36% from 61.95% for system 1#. The application of the ejector improved the efficiency by 3.41%.

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