Theoretical analysis of a novel ejector augmented compressed air energy storage system
This study proposes a novel ejector-augmented adiabatic compressed air energy storage system designed to mitigate the significant pressure loss observed in conventional systems during constant-pressure operation.It employs a two-stage ejector to harness the exhaust gas after expansion,thereby recovering part of the lost pressure energy and enhancing the expander's inlet flow rate to boost the system's power generation capacity.We developed a thermodynamic model for this novel system and performed a comparative analysis with conventional systems using identical operating parameters.This study focuses on the effects that the primary fluid pressure,secondary fluid pressure,and intermediate pressure within the two-stage ejector have on system performance.Results reveal that increasing these pressures causes the full-cycle efficiency of the system to follow an approximate parabolic trend.Furthermore,the optimal operating parameters of the ejector have been identified.Under optimal working conditions,the system's full-cycle efficiency is 63.32%,indicating an improvement of 0.91%over the 62.41%efficiency achieved by the conventional throttling-down method.Based on the above,this study establishes a theoretical foundation for enhancing the ejector efficiency of compressed air energy storage systems,aiming to reduce throttling loss and improve overall performance.
compressed air energy storagetwo-stage ejectorconstant pressure operationcycle efficiency
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