Taking a 660MW ultra-supercritical boiler with double reheat as an example,the influences of two flue gas temperature regulation methods on boiler performance were researched by changing the vertical angle of swing burner and changing flue gas recirculation ratio under medium and low loads.The results show that the flue gas recirculation technology can greatly improve the single and double reheat steam temperature of the ultra-supercritical boiler with double reheat under medium and low load operation,reduce the NOx emission mass concentration.It is an effective means to improve the steam temperature of the ultra-supercritical boiler with double reheat.Flue gas temperature regulation through swing burner can also improve the temperature of single and double reheat steam,but the range is small.The two flue gas temperature regulation methods will lead to poor boiler thermal efficiency.In general,the comprehensive effect of flue gas recirculation technology is the best,and it can be the standard configuration of ultra-supercritical boiler with double reheat.
ultra-supercritical boilerdouble reheat cycleflue gas recirculationswing burnersteam temperature
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