CO2稀释燃料对富氧扩散燃烧中NOx生成的抑制作用

1前言在气体燃料或氧化剂侧添加惰性成份(作为稀释剂)是改善燃烧或抑制污染物生成的途径之一[1~6]。从本质上分析,添加稀释剂是另一种形式的烟气循环,一般为在氧化剂侧和燃料测添加H2O、N2和CO2,也有部分研究者研究了He的影响[4]。由于减排温室气体、封存CO2愈来愈成为全球性的

The Role Played by CO2 Diluted Fuel in Suppressing Nox Formation During an Oxygen-enriched Diffusion Combustion Process

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 CO_2 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 CO_2 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 CO_2 diluted fuel can,in addition to maintaining a relatively high flame temperature,effectively reduce NO_x formation and NO_x emission index ELNO.