Abstract: An experiment was performed to study the removal of NO_x pollution and formation of greenhouse gas (N₂O) and CO in NO_xOUT process. Kinetic analysis was combined with the experiment results to discuss the effect of additives. The optimum reaction temperature was 950℃ and the highest denitration efficiency could reach 76.33% with different normalized stoichimetric ratios (NSR). The formation curves of N₂O with temperature were similar to the efficiency curve and N₂O emission reached a peak value at the temperature around 950℃. Increasing NSR and O₂ concentration made N₂O emission level higher. N₂O emission first increased and then decreased with increasing residence time at higher temperatures (950℃,1000℃). Sodium carbonate, sodium acetate, sodium glutamate and ethanol could effectively improve the denitration efficiency on the low temperature side and extend corresponding temperature window, especially obviously for sodium glutamate. Denitration efficiency was related to temperature when altering the concentration of sodium salts and the optimum addition amount was 60 ml·L^-1 for sodium atom. Above-mentioned additives could all remarkably reduce the emission of N₂O and CO at medium and high temperatures, but adversely at the end point of low temperature. N₂O and CO emission presented respective variation trends with the differences of temperature, type and concentartion of additives.

Key words: pollution, NO_xOUT, removal characteristic, greenhouse gas, N₂O, additive, kinetics, formation rule

摘要： 通过试验研究了NO_x污染的NO_xOUT脱除特点和温室气体N₂O及CO的生成规律，结合动力学分析，探讨了添加剂的作用。结果表明：在不同氨氮比（NSR）下，最佳反应温度为950℃，最高脱硝效率可达76.33%；N₂O随温度的生成曲线类似于效率曲线，在950℃左右达到最大排放量；N₂O的排放随NSR和氧量的增加而升高；温度较高时，N₂O的排放随停留时间的延长先增加后减少；碳酸钠、乙酸钠、谷氨酸钠及乙醇可有效提高低温侧的脱硝效率和拓宽相应的温度窗口，其中谷氨酸钠最为明显；脱硝效率随钠盐添加量的变化与温度有关，钠原子最佳添加量为60 ml·L^-1；上述添加剂均可明显降低中高温段的N₂O、CO排放，低温端则相反；N₂O、CO的排放随温度、添加剂种类及浓度的不同而呈现各自的变化趋势。

关键词: 污染, NO_xOUT, 脱除特点, 温室气体, N₂O, 添加剂, 动力学, 生成规律