科研之友
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摘要
In this work, image spectroscopy and numerical simulation were applied to reveal NH3/NO conversion in the reburning zone where NH3 and NO coexist. Methane premixed flame doped with the mixture of NH3 and NO was utilized to investigate the nitrogen conversion in the reburning zone in which NO and NH3 existed simultaneously. Meanwhile, the premixed methane flames doped with NH3/NO/the mixture of NH3 and NO were compared to acquire the mechanism of effect on NO reduction and NH3 oxidation in the presence of NH3 and NO. Sensitivity analysis was applied to obtain the key radicals in the process of NO generation and transformation. The spatial distribution characteristics of these radicals were further obtained by using image spectroscopy. The results of image spectroscopy showed that the simultaneous presence of NO and NH3 led to the decrease of OH and the increase of NH and CN. It was also found that the reduction of NO occurred earlier than the oxidation of NH. In addition, the spatial distribution of the reaction rate between NH and OH was obtained by calculating the product of spontaneous emission intensity of NH and OH. The rate of production (ROP) of NO was used to generate the mechanism of NH3 and NO coexistence on nitrogen transformation. The results showed that in NO + NH3 flames, the acceleration of the oxidation reaction rate of nitrogenous intermediates was limited, but the reduction reaction rate of NO increased rapidly relative to other flames, which led to the decrease of NO when NO and NH3 coexist. This study revealed the mechanism of the coupling effect of NO reduction and NH3 oxidation on the nitrogen conversion, which provides theoretical guidance for improving the NOx removal effect in the reburning zone.
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单位中国科学院
