氧煤MILD燃烧条件下NO生成的动力学模拟

发布时间：2018-04-19 21:14

本文选题：MILD燃烧 + NO生成　；参考：《煤炭学报》2016年09期

【摘要】：利用CHEMKIN研究氧化剂与内回流烟气之间的掺混温度和氧气体积分数两个关键因素对氧煤MILD燃烧条件下NO生成的影响,选取氧化剂气氛为5%O_2/90%CO_2/5%H_2O,10%O_2/85%CO_2/5%H_2O,15%O_2/80%CO_2/5%H_2O和25%O_2/70%CO_2/5%H_2O,温度为1 273,1 373和1473 K。结果表明:NH_2是一关键的前驱组分,反应NH_2+OH=NH+H_2O对促进NO生成影响最大,而反应NH_2+NO=N_2+H_2O对抑制NO生成影响最大,两者影响力随着氧气体积分数降低而加大;提高掺混温度和氧气体积分数可增大燃料N→NO的转化率和OH基团的平衡浓度,氧气体积分数10%~15%是一个可兼顾CO和NO排放的较合理区间,且氧气体积分数的改变对污染物排放的影响与掺混温度的关系不大;NO还原路径的反应速率在低氧气体积分数下反而有不同程度的增大,在MILD燃烧条件下,还原反应的趋势增强,从而延长反应进程,增加系统的整体复杂性。
[Abstract]:The results showed that the reaction of NH_2 OH=NH H 2O had the greatest effect on the no production, while the reaction NH_2 NO=N_2 H 2O had the greatest effect on the inhibition of no production, and the influence of the reaction NH_2 NO=N_2 H 2O on no production increased with the decrease of oxygen volume fraction. Increasing the blending temperature and oxygen volume fraction can increase the conversion rate of no and the equilibrium concentration of OH group. The oxygen volume fraction of 10 ~ 15% is a reasonable range for both CO and no emission. The effect of oxygen volume fraction on pollutant emission is not related to the mixing temperature. The reaction rate of no reduction path increases in varying degrees under the low oxygen gas integral number, and the trend of reduction reaction increases under the condition of MILD combustion. Thus prolonging the reaction process and increasing the overall complexity of the system.
【作者单位】：同济大学机械与能源工程学院;
【基金】：上海市重点实验室建设资助项目(13DZ2260900)
【分类号】：TK16

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