660 MW燃煤机组与AA-CAES耦合系统热解耦及调峰研究OA

The large-scale integration of renewable energy poses significant challenges to the peak-shaving capacity of coal-fired units.To enhance operational flexibility and address energy flow conflicts in typical coal-fired systems coupled with compressed air energy storage systems during peak shaving,this study investigates a 660 MW coal-fired unit using EBSILON software.Three energy storage schemes and two energy release schemes are proposed and evaluated through thermo-economic analysis,focusing on thermal-time decoupling capability,peak-shaving paradox elimination,and system performance.The results show that during energy storage,the scheme utilizing intermediate-pressure cylinder exhaust for thermal oil heating achieves the highest thermal storage gain ratio(1.370)and the lowest heat rate(8 814.976 kJ/(kW·h)).During energy release,the scheme absorbing heat from No.3 high-pressure heater drain outlet yields the minimum heat rate(7 547.945 kJ/(kW·h)).After 8 hours of operation,the system retains 38.503 MW·h of utilizable thermal energy and reduces the peak-shaving paradox index to-0.041.Parameter optimization improves the round-trip efficiency of the compressed air energy storage system by 2.702 percentage points and increases the unit's peak-shaving depth by 2.481%.This study provides a viable solution for synergistic optimization of coal-fired units and energy storage systems.