The characteristics and mechanism of the NO formation during oxy-steam combustion
The characteristics and mechanism of the NO formation during oxy-steam combustion
复制标题
富氧蒸汽燃烧NO生成特征及机理
DOI：
10.1016/j.fuel.2015.06.034
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发表时间：
2015-10
期刊：
影响因子：
7.4
通讯作者：
Chuguang Zheng
中科院分区：
文献类型：
--
作者：
Qingsong Han;Yang Liu;Fei Guo;Chuguang Zheng
Oxy-fuel combustion has been deemed a promising technology to reduce CO 2 emissions from coal-fired power stations, and oxy-steam combustion technology is regarded to be the next-generation oxy-fuel combustion technology. The characteristics and mechanism of NO formation were numerically studied in the counter-flow laminar diffusion flame using methane as fuel. The comparisons of the N conversion rate in the oxy-steam combustion with that in air combustion under a similar temperature profile show that the emission of NO is enhanced due to high concentration of H 2 O during oxy-steam combustion compared with air combustion. The chaperone effect of H 2 O and a high mole fraction of H 2 O are important reasons for the enhancement of NO formation during oxy-steam combustion because H+ NO+ M⇔ HNO+ M and HNO+ OH⇔ NO+ H 2 O are enhanced dramatically. The key elementary reaction for the enhancement of NO production during oxy-steam combustion is NH+ H 2 O⇔ HNO+ H 2 because it produces a large amount of HNO due to a high mole fraction of H 2 O. The nitrogen conversion rate through the pathway NH 2→ NH→ HNO→ NO is dramatically enhanced and predominant during oxy-steam combustion. The nitrogen conversion rate increases with the increase in the mole fraction of H 2 O in O 2, and equivalence ratio has a minimal impact on the NO formation during oxy-steam combustion.
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影响因子：
4.4
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