Flexibility Mining of Subcritical Tangential Combustion Boilers based on Peak Shaving Scenarios
In order to improve the low load stable combustion,wide load denitrification,fast load change rate,fast start stop,and peak shaving auxiliary services of coal-fired power generation unit boilers,and to tap into the flexibility potential of subcritical tangential combustion boilers,a 600 MW subcritical coal-fired unit in a power plant was taken as an example.The boiler was comprehensively renovated using DC burner vertical rich lean transformation technology,coal mill dynamic separator technology,and economizer bypass flue technology.Through boiler performance tests,the main performance indicators of the boiler before and after the renovation were compared and analyzed.The experimental results show that the minimum stable combustion load of the modified unit has decreased from 40％of the rated load to 30％.After the renovation,the average mass concentration of NOx at the inlet of the denitrification system under the minimum stable combustion load is 239.73 mg/Nm3,which is 168.53 mg/Nm3 lower than before the renovation.The coal powder fineness R90 of the coal mill modified by the dynamic separator can achieve an adjustment range of 25％to 38％,and the coal powder fineness R200 can achieve an adjustment range of 2％to 5％.After the renovation,the inlet flue gas temperature of the 30％rated load denitrification system is higher than 300 ℃.The successful case of flexibility transformation of 600 MW subcritical units can provide reference and inspiration for the flexible transformation of thermal power units.
subcritical unitflexibility transformationdirect current burnerminimum stable combustion loadaverage mass concentration of NOx
万方数据
维普
