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以某台600MW亚临界锅炉为例,分析了低氮改造对其汽温静态特性和动态特性的影响.结果表明:低氮改造后炉内温度场、受热面结渣情况和锅炉运行模式均发生较大变化,对锅炉汽温特性产生较大影响;高负荷时锅炉汽温主要受分级燃烧导致的炉膛出口烟气温度上升和受热面结渣改善导致的炉膛出口烟气温度下降的综合影响;低负荷时锅炉汽温主要受分级燃烧导致的炉膛火焰中心高度降低和炉膛出口氧量的影响;快速降负荷过程中,炉膛火焰中心高度降低与汽轮机高压缸排汽温度下降对再热汽温的叠加影响是导致再热汽温易超跌的主要原因.
Taking a 600 MW subcritical boiler as an example, the effects of low N reformation on its static temperature characteristics and dynamic characteristics are analyzed. The results show that the temperature field, the slagging of the heated surface and the boiler operating mode all occur after the low N transformation The large variation has a great effect on the steam temperature characteristics of the boiler. The boiler temperature at high load is mainly affected by the rising of the flue gas temperature at the exit of the furnace and the decrease of the flue gas temperature at the exit of the furnace due to the improvement of the fouling on the heating surface. The boiler steam temperature under low load is mainly affected by the reduction of furnace flame center height caused by staged combustion and the outlet oxygen content of the furnace. During the process of rapid load reduction, the height of the flame center of the furnace decreases and the temperature of the exhaust gas of the high- The superposition effect is the main reason that the temperature of reheat steam is easily oversold.