基于化学反应器网络模型法的预混气组分对NOx反应路径影响研究

摘 要：为探究预混气组分对不同反应路径下NOx生成影响，针对高压射流反应器，基于CFD流场特征等，构建优化了单PSR、2PSR、3PSR以及PSR+PFR四种化学反应器网络模型。在贫预混燃烧条件下，研究了纯CH4及其混合气燃烧时不同反应路径下NOx的生成情况，得出了燃烧室内不同反应区域每条反应路径NOx的生成量。结果表明，纯CH4燃烧产生的NOx主要来自于热力型、快速型和N2O-中间体型三条反应路径。绝热火焰温度的提高主要促进了热力型和N2O-中间体型NOx的生成。随着CH4或CO中加入H2摩尔分数的增加，NOx排放总量降低，快速型NOx生成速率降低，特别是火焰刷区域的。另外，混合气中CO摩尔分数的增加会导致NOx生成量增多。

Effects of Premixed Gas Components on NOx Pathways Based on Chemical Reactor Network Model

Abstract: To investigate the effects of premix gas components on NOx generation under different pathways, four chemical reactor network (CRN) models, namely single PSR, 2PSR, 3PSR and PSR+PFR, were constructed and optimized based on the characteristics of CFD flow field in high-pressure jet stirred reactor (HP-JSR). Under the condition of lean premix combustion, the NOx generation of pure CH4 and its mixture in different pathways were studied, and the NOx generation of each pathway in different reaction areas in the combustion chamber was obtained. The results show that NOx produced by pure CH4 combustion mainly comes from three pathways: thermal NOx, prompt NOx and N2O-intermediate NOx. It is found that thermal and N2O-intermediate NOx emission increases with the increase of adiabatic flame temperature. With the addition of H2 in CH4 or CO, the total NOx emission decreases and the rate of prompt NOx decreases, especially in the flame brush area. In addition, NOx emission increases with the CO mole fraction increases in the CH4/CO mixture.