利用自行设计的多孔介质实验台，对C2H4-AIR-N2预混气体在多孔介质燃烧器内的燃烧特性进行了实验研究,分析燃料当量比、预混气体流速以及N2稀释比对预混气体的可燃极限、火焰传播方向、火焰温度分布以及污染物排放的影响。研究表明：随着稀释比的上升，预混气体的可燃极限范围缩小，火焰向上游传播的工况逐渐减少；燃烧器内最高火焰温度与当量比以及气体流速正相关，与稀释比负相关；CO的排放量随着稀释比的上升而增加，与当量比以及气体流速负相关；实验中的NO排放量小于20 mg/m3。

The combustion characteristics of C2H4-AIR-N2 premixed gas in a porous media burner were experimentally studied using a selfdesigned porous media experimental platform.The effects of fuel equivalent ratio,premixed gas flow rate and N2 dilution ratio on the flammability limit,flame propagation direction,flame temperature distribution and pollutant emission of premixed gas were analyzed.The results show that with the increase of dilution ratio,the range of flammability limit of premixed gas decreases,and the upstream flame propagation condition decreases gradually.The maximum flame temperature in the burner is positively correlated with equivalence ratio and gas flow rate,and negatively correlated with dilution ratio.The CO emission increases with the increase of dilution ratio and is negatively correlated with equivalence ratio and gas velocity.The NO emission in the experiment was less than 20 mg/m3.

TK09