【摘要】 降低高温火焰中的氮氧化物排放是富氧燃烧作为新型节能燃烧技术得以推广应用的关键之一。本文针对烟气再循环等方法的氮氧化物抑制原理,以对向流扩散火焰为对象,利用详细的基元反应动力学模型研究了在不同富氧浓度条件下CO2稀释燃料对火焰特性和NOx生成的影响。结果表明,用CO2稀释燃料对燃烧特性的影响随着氧化剂中氧浓度的增大趋于显著,而且在较高氧浓度时,CO2稀释燃料可以在维持较高火焰温度的同时有效地降低NO生成及NO排放指数EINO。更多还原

【Abstract】 The reduction of NO_x emissions in a high-temperature flame is a key factor for furthering the widespread use of oxygen enriched combustion as a new type of energy-saving combustion technology.Based on the theory of NO_x suppression realized through the use of flue-gas recirculation,etc and with a counterflow diffusion flame serving as an object of investigation the impact on flame characteristics and NO_x formation by CO₂ diluted fuel under various concentrations of enriched oxygen was studied using a model of detailed elementary-reaction dynamics.The results of the study indicate that the impact of the CO₂ diluted fuel on combustion characteristics will tend to be conspicuous with an increase in oxygen concentration in an oxidation agent.Moreover,under a relatively high oxygen concentration the CO₂ diluted fuel can,in addition to maintaining a relatively high flame temperature,effectively reduce NO_x formation and NO_x emission index ELNO.更多还原