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在循环流化床(CFB)锅炉中,NOx和N2O的排放浓度由NOx和N2O在炉膛内生成和降解的相对速度决定。该文利用小型流化床实验台研究了循环灰对NO和N2O浓度的影响。实验温度控制在850℃,反应时间为25ms。结果表明:在实验台反应器中加入一定量的循环灰以后,NO的排放浓度降低,而N2O的排放浓度先增加然后略有降低;循环灰中的C以及C反应生成的CO能还原NO,并促进N2O的生成,而循环灰中的CaO、Fe2O3等活性组分能促进N2O的热分解。
In circulating fluidized bed (CFB) boilers, the NOx and N2O emission concentrations are determined by the relative velocities of NOx and N2O formation and degradation in the furnace. In this paper, the effect of circulating ash on the concentration of NO and N2O was studied by a small fluidized bed experiment bench. Experimental temperature control at 850 ℃, the reaction time was 25ms. The results show that after a certain amount of circulating ash is added into the reactor in the laboratory, the emission concentration of NO decreases and the emission concentration of N2O increases first and then decreases slightly. The C in the circulating ash and the CO generated from the reaction of C can reduce NO, And promote the formation of N2O. However, CaO, Fe2O3 and other active components in recycled ash can promote the thermal decomposition of N2O.