Coal-fired power generation units based on circulating fluidized bed (CFB) combustion technology can achieve long-period near-zero load (banked-fire) operation with rapid start and stop capabilities,thereby enabling full-load regulation. Experimental results on a 300 MW subcritical CFB boiler demonstrate that the unit's power can rapidly drop to 1 MW at a rate of 10.4％ Pe/min and then maintain long-term stable operation at an ultra-low load ratio of 1％,with a total hot standby duration exceeding 110 minutes. After finishing the banked-fire operation,the unit can restart at a rate of 3.5％ Pe/min. During this period,the average bed temperature decreases from 800 ℃ to 553 ℃ at a rate of 2.2 ℃/min;the main steam temperature and pressure drop by 165 ℃ and 1.7 MPa,respectively;the lateral temperature deviation of each heating surface is basically within 10 ℃;and the turbine and generator operate smoothly with all parameters within safe limits. During the load lift phase,the instantaneous CO concentration in the flue gas rises sharply above 1％,but there is no risk of explosion. The hourly average emissions of dust,sulfur dioxide,and nitrogen oxide pollutants throughout the peak regulation process meet ultra-low emission standards. This study provides a more competitive direction for further enhancing the flexibility of coal-fired power units,which is of great significance for accommodating a high proportion of renewable energy sources,as well as for ensuring the reliable and stable operation of new electric power systems.
关键词
灵活煤电/循环流化床(CFB)/全负荷调峰/快速启停/压火热备
Key words
flexible coal-fired power generation/circulating fluidized bed (CFB)/full-load regulation/fast start-stop/banked-fire operation
维普
万方数据