为考察反应温度、氨氮摩尔比（NSR）、氧气体积分数及停留时间对选择性非催化还原（SNCR）脱硝效率的影响规律，并探究乙醇、碳酸钠和氯化铁添加剂的低温SNCR脱硝增效特性，深入分析其脱硝反应机理，在管式反应炉上进行了以碳酸氢铵为还原剂的SNCR脱硝实验及各添加剂的低温脱硝增效实验。实验结果表明：当氨氮摩尔比为1.7，氧气体积分数为4%时，以碳酸氢铵为还原剂的SNCR法在830~1 000 ℃下的脱硝效率高于60%；氧气体积分数为零时，不同温度下脱硝效率始终低于15%，氧气体积分数为2%~6%时，650~1 000 ℃下的脱硝效率随氧气体积分数增加而提高；SNCR反应速率随温度的升高而加快，反应达到平衡所需的停留时间变短；在模拟烟气中添加200 μl/L的乙醇可使650~800 ℃的低温范围内脱硝效率平均提升近30%，650 ℃的脱硝效率达到33.4%；添加少量碳酸钠（25 μl/L）或100 μl/L的氯化铁可使700~800 ℃下的脱硝效率平均提升超过25%；3种添加剂都能通过提高NH2自由基的生成量提高低温下SNCR法的脱硝效率。

In order to investigate the effects of reaction temperature, ammonianitrogen molar ratio (NSR), volume fraction of oxygen and residence time on the denitration efficiency of selective noncatalytic reduction (SNCR) and the SNCR denitration synergistic characteristics with ethanol, sodium carbonate and ferric chloride as additives at low temperature, the denitration reaction mechanism was deeply analyzed,and the SNCR denitration experiment with ammonium bicarbonate as the reducing agent and the denitration synergistic test of each additive at low temperature in atubular reaction furnace were carried out.The experimental results show that when the molar ratio of ammonia nitrogen is 1.7 and the volume fraction of oxygen is 4%, the denitration efficiency of SNCR method with ammonium bicarbonate as reductant will be higher than 60% at 830 ℃ to 1 000 ℃. When the volume fraction of oxygen is 0, the denitration efficiency will be always lower than 15% at different temperatures. When the volume fraction of oxygen is 2% to 6%, the denitration efficiency will increase with the increase of volume fraction of oxygen at 650 ℃ to 1 000 ℃. The reaction rate of SNCR will increase with the increase of temperature, and the residence time required for the reaction to reach equilibrium will be shorter. The addition of 200 μl/L ethanol in simulated flue gas can enhance the denitration efficiency by nearly 30% on average at 650 ℃ to 800 ℃, and the denitration efficiency reaches 33.4% at 650 ℃. The addition of a small amount of sodium carbonate, such as 25 μl/L, or 100 μl/L ferric chloride can increase the denitration efficiency by more than 25% on average at 700 ℃ to 800 ℃. All three additives can improve the denitration efficiency of SNCR method at low temperature by increasing the generation of NH2 radicals.

X511

国家重点研发计划（2020YFB0606300）；山西省科技计划揭榜招标项目（20201101013）