生物质燃烧NO生成的影响因素实验研究

Experimental study on the influencing factors of NO formation during biomass combustion

以稻壳、木屑、甘蔗渣和秸秆等4种典型生物质颗粒为研究对象,在自主设计的十字形管式炉内,研究了燃料种类、温度、氧量和气氛因素对NO生成的影响。实验结果表明:燃料含N量越高,NO生成总量亦越高,最高可达0.9848 mg·g^(-1),而此时燃料N向NO的转化率是下降的,仅为7.18%;NO生成总量随着温度升高而升高,但不同生物质颗粒增加程度不同;随着O_(2)体积分数的增加,NO生成总量增加,释放最大值超过0.26%;O_(2)/N_(2)气氛下,高浓度氧量体积分数使得燃烧过程几乎不生成CO,整个反应过程均在氧化性气氛下进行,NO生成总量远高于O_(2)/CO_(2)气氛,燃料N向NO的转化率较高。

Taking rice husk,wood chips,bagasse and straw of four kinds of typical biomass particles as the research objects,the effects of biomass type,temperature,O_(2) concentration and atmosphere on NO production were studied in a self-designed cruciform tube furnace.The results showed that the amount of fuel-N was greater,NO emissions were also higher to be 0.9848 mg·g^(-1) while the conversion ratio of fuel-N to NO declined only by 7.18%.The total amount of NO release increased with increasing temperature but different biomass particles have different increasing proportion.Improving the oxygen volume fraction,the total amount of NO release also increased,the maximum value of which is more than 0.26%.In the O_(2)/N_(2) atmosphere,almost no CO was released because the whole reaction process was carried out in an oxidizing atmosphere due to the high concentration of oxygen.In O_(2)/N_(2) atmosphere,the total amount of NO release and the conversion ratio of fuel-N to NO were much higher than those in O_(2)/CO_(2) atmosphere.