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对一台660 MW旋流对冲锅炉在不同层燃烧器组合运行工况下进行了炉内流动、燃烧和NOx排放特性的数值模拟,模拟结果与试验值相对误差小于10%。模拟结果表明:额定负荷时,5层燃烧器运行,停前墙和停后墙同层燃烧器时NOx排放和飞灰含碳量基本相同;停上层燃烧器相比于停中层燃烧器,空气分级效果强化,煤粉颗停留时间增加,NOx和飞灰含碳量分别降低9.5%和9.8%,在锅炉实际运行过程中,停上层燃烧器更有利于降低NOx排放和提高燃烧效率。
The numerical simulation of the flow, combustion and NOx emission characteristics of a 660 MW swirling hedge boiler at different combustor operating conditions was carried out. The relative error between simulation results and experimental values was less than 10%. The simulation results show that: NOx emission and carbon content of fly ash are basically the same when the load is on, the five-layer burner operates, the stop wall and the stop wall with the same layer burners; the stop upper burners compared to stop middle burners, air The classification effect is strengthened, the residence time of pulverized coal powder is increased, and the carbon content of NOx and fly ash is decreased by 9.5% and 9.8% respectively. During the actual operation of the boiler, stopping the upper burner is more conducive to reducing NOx emission and improving combustion efficiency.