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在15 kW循环流化床实验台上进行了城市干化污泥的燃烧实验,研究了污泥含水率、燃烧温度、过量空气系数、二次风比率等因素对NO和N_2O排放特性的影响。实验结果表明:污泥含水率从4.5%增加至17.5%时,NO排放浓度明显降低,N_2O排放浓度明显升高;燃烧温度升高,NO排放浓度呈上升趋势,N_2O排放浓度则呈下降趋势;增大过量空气系数会促进NO和N_2O的生成;提高二次风比率可以降低NO和N_2O的排放浓度。城市干化污泥在循环流化床燃烧过程中NO和N_2O的排放浓度高于污泥与煤混烧时的排放浓度,但燃料N向NO和N_2O的转化率低于与煤混烧过程。
The experiment of city dry sludge combustion was carried out on a 15 kW circulating fluidized bed test bench. The effects of sludge moisture content, combustion temperature, excess air ratio and secondary air ratio on the emission characteristics of NO and N 2 O were studied. The experimental results show that when the moisture content of sludge increases from 4.5% to 17.5%, the NO emission concentration obviously decreases and the N2O emission concentration obviously increases. When the combustion temperature increases, the NO emission concentration and the N2O emission concentration decrease. Increasing the excess air coefficient will promote the formation of NO and N 2 O; increasing the secondary air ratio can reduce the concentration of NO and N 2 O emission. The emission concentration of NO and N_2O in municipal solidified sludge during CFB combustion is higher than that of sludge and coal, but the conversion of N to NO and N_2O is lower than that of co-combustion with coal.