Identification of NOx formation based on nitrogen element labeled NH3 combustion
NH3 fuel is a promising zero-carbon fuel,but its difficult ignition,low reactivity and high NOx emission limit its practical application.In order to accurately distinguish the source of NOx formation in the NH3 combustion process,due to the fact that both fuel and oxidant contain N elements,it is difficult to clearly distinguish the source of NOx formation,and the significant difference of NOx formation in NH3 fuel under different combustion modes.Based on the detailed mechanism of NH3 combustion,this paper constructs a new chemical reaction mechanism containing N element labeling by a chemical reaction mechanism similar to isotope labeling,and gives a detailed mathematical expression.The effectiveness of the simulation results under distinguishing(NH3/N2/O2)and non-distinguishing(NH3/N2/O2)was verified by comparison in a homogeneous reactor involving only chemical reaction processes.The results show that compared with the unlabeled mechanism,the average error of the maximum mole fraction of the component and the mole fraction of the combustion product is less than 0.1%,and the prediction error of the maximum reaction rate of the component is less than 0.3%,which proves the effectiveness of the labeling method.The simulation results of homogeneous reactor show that with the increase of reaction temperature,the generation source of NO is gradually shifting from NH3 to N2 as the main source,indicating that the reduction mechanism of NO generated by NH3 combustion at different temperatures is different.
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