재생에너지 출력제어 완화를 위한 해수이용 흐름전지 성능평가

Abstract

Long-duration energy storage (LDES) is an essential technology for reducing renewable energy curtailment induced by intermittent and imbalanced renewable power supplies. Seawater-based energy storage is an emerging candidate for use in LDES because it is both scalable andeconomical. A Blue-Battery is a flow battery that generates power by separating NaCl in seawater into acid (HCl) and base (NaOH) and discharges by the neutralization reaction of the acid and base. In this study, the performance of a lab-scale Blue-Battery stack was evaluated based on the applied electrical potential and the flow rates. Increasing the applied electrical potential during charging increased the concentrations of acid and base solutions. However, by increasing the flow rate, the concentrations of the acid and base solutions decreased because of the reduced retention time in the Blue-Battery stack. By estimating the energy potential and efficiency of the lab-scale Blue-Battery stack, an energy efficiencyof 21.0% was achieved at a flow rate of 4.1 mL/min.