【摘要】 氮氧化物（NO_x）是燃烧产生的一种有害气体。为了满足低氮排放标准，烟气循环是减少NO_x生成的有效方式。以一台带有烟气内循环的1.4 MW油气两用燃烧器为研究对象，设计了燃烧器和燃烧室的几何结构；采用燃烧过程数值模拟方法，分析了燃烧器旋流器叶片安装位置、叶片数目、形状等参数对燃气燃烧过程NO_x生成特性的影响。通过数值模拟，得到了燃气燃烧过程的流场、温度场、组分场以及氮氧化物分布的详细信息，揭示了燃烧室内流动、燃烧和传热过程的特点及其产生的原因。通过模拟分析发现，带有烟气内循环的燃烧器旋流器含6个倾角为37°的扇形叶片，叶片距离空气渐缩口60 mm为较佳结构，额定功率下NO₂排放量为29.9 mg/m³,相比无旋流器工况NO₂排放量降低了76.7%。更多还原

【Abstract】 Nitrogen oxides（NO_x） is a harmful gas produced by combustion. Flue gas recirculation is an effective measure to reduce NO_x generation to meet low-nitrogen emission standards. A 1.4 MW dual-fuel burner with internal flue gas recirculation has been focused on, and the geometric structure of the burner and combustion chamber have been designed. The numerical simulation has been used to analyze the effects of burner swirler installation position, blade number, and shape on NO_x generation characteristics during methane combustion. Through numerical simulation, detailed information on the flow field, temperature field, composition field, and NO_x distribution in gas combustion process have been obtained, the characteristics and causes of flow, combustion, and heat transfer processes in the combustion chamber have been revealed. Simulation analysis shows that the burner swirler with six sector blades inclined at 37°and the blade distance of 60 mm from the air gradually shrinking mouth is the optimal structure, with a NO₂ emission rate of 29.9 mg/m³ at rated power, which reduces NO₂ emissions by 76.7% compared to the no-swirler condition.更多还原