掺杂H_(2)/CO对C_(2)H_(4)(O_(2)/CO_(2))扩散火焰中碳烟生成的影响

Effect of H_(2)/CO Doping on Soot Formation in C_(2)H_(4)(O_(2)/CO_(2)) Diffusion Flame

通过消光法实验和CoFlame程序模拟研究O_(2)/CO_(2)气氛下,掺杂H_(2)/CO对层流乙烯扩散火焰中碳烟生成的影响,获得火焰高度、温度、碳烟及重要组分含量的分布,分析主要碳烟演化过程的变化规律。结果表明:掺杂H_(2)/CO对乙烯火焰中的碳烟生成有明显抑制作用,当H_(2)与CO的流量比为0.3∶0.3时,抑制作用最强,碳烟体积分数降低25.3%;掺杂H_(2)/CO对乙烯火焰的高度、温度影响微弱,热效应、氧化速率不是影响乙烯火焰中碳烟生成的主要因素,主要是通过抑制乙炔、苯、芘的生成抑制碳烟成核和碳烟表面增长,最终减少碳烟的生成。

The influence of H_(2)/CO doping on soot formation in laminar ethylene diffusion flame inO_(2)/CO_(2) atmosphere wasstudied by extinction experiment andCoFlameprogram simulation.Thedistributions of flame height,temperature,content of soot and important components were obtained,and the variation of main soot evolution process was analyzed.The results show that the addition of H_(2)/CO has obvious inhibition effect on soot formation in ethylene flame.When the flow ratio of H_(2) to CO is 0.3∶0.3,the inhibition effect is the strongest,and the soot volume fraction decreases by 25.3%.The effect of H2/CO doping on the height and temperature of ethylene flame is weak,the thermal effect and oxidation rate are not the main factors affecting soot formation in ethylene flame.It is mainly through inhibiting the formation of acetylene,benzene and pyrene,then inhibiting the soot nucleation and soot surface growth,and finally reducing the soot formation.