利用固定床实验系统，在800～1 500 ℃的反应温度范围内进行了NH3还原NO实验，分析不同气氛条件下反应温度、氨氮摩尔比以及组分浓度对脱硝效率的影响。实验结果表明：氧化性气氛下最佳脱硝温度约为950 ℃，温度继续升高时脱硝效率开始下降，而还原性气氛下NH3对NO的还原存在一个临界温度（约1 000 ℃），低于临界温度时，NH3对NO没有脱除效果，反而会额外生成NO，超过临界温度后，脱硝效率随着温度的升高迅速跃升至最大，氨氮摩尔比为2.0时最大脱硝效率可达95%，且在1 200 ℃以上的高温条件下保持稳定；修正后的GADM98模型对NO浓度的预测与实验结果符合较好，活性基团对NH2的消耗是高温氧化性气氛下脱硝效率下降的重要原因。

To study the rule of denitration by NH3 under high temperature conditions,experimental and chemical kinetic model studies on denitration by NH3 were carried out on a fixed bed experimental system in the temperature range of 800～1 500 ℃.The effects of reaction temperature,normalized stoichiometric ratio and components concentration on denitration efficiency were studied under different atmosphere conditions.The experimental results show that the optimum denitration temperature is about 950 ℃ under the oxidizing atmosphere,and the denitration efficiency begins to decrease as the temperature continues to increase.However,a critical temperature（about 1 000 ℃） of the denitration efficiency was found under the reducing atmosphere.When the temperature is below this critical temperature,NH3 results in additional NO generation rather than reducing NO.And when the temperature is over this critical temperature,the denitration efficiency reaches the maximum level rapidly,then keeps steady above 1 200 ℃,meanwhile the maximum denitration efficiency could reach above 95% with the normalized stoichiometric ratio of 2.0.The calculation results of the modified GADM98 model turn out to be in good agreement with the experimental results.Finally,the consumption of NH2 by active groups will decrease the denitration efficiency under the high temperature oxidizing atmosphere.

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四川省科技支撑计划（2016JZ0019）