Quantitative evaluation of NO formation and destruction routes during methane MILD combustion using an improved calculation method
Quantitative evaluation of NO formation and destruction routes during methane MILD combustion using an improved calculation method
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使用改进的计算方法定量评估甲烷 MILD 燃烧过程中 NO 的形成和破坏路径
DOI：
10.1016/j.fuel.2022.124593
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发表时间：
2022
期刊：
影响因子：
7.4
通讯作者：
Hao Liu
中科院分区：
文献类型：
--
作者：
Shunta Xu;Shaocai Jin;Yuhang Tong;Bing Shi;Yaojie Tu;Hao Liu
·对现有的甲烷MILD燃烧NO计算方法进行了评价。·提出了一种改进的计算方法来量化各NO路径的贡献。·改进后的计算方法包括热力再燃、瞬发再燃、N2 O中间再燃、NNH再燃、SNCR再燃和NO再燃。·用改进的方法从两种机理评价了甲烷温和燃烧过程中NO的生成和破坏途径。·两种机制在预测NO生成时表现不同，通过即时，N2 O-中间体和NNH途径。适度或强烈的低氧稀释（MILD）燃烧由于其超低的一氧化氮（NO）排放而变得越来越有吸引力。尽管人们已经做了很多努力来研究温和燃烧中NO的生成和破坏途径，但在使用先前开发的NO计算方法时，它们的相对贡献仍然未能达成一致。为此，这些NO计算方法首先评估甲烷MILD燃烧的动力学模型的搅拌反应器（WSR）。提出了一种改进的计算方法来量化NO子途径的贡献，包括热途径、瞬发途径、N2 O中间体途径、NNH途径、选择性非催化还原途径和NO再燃途径。此外，这种改进的方法允许应用除GRI-Mech 2.11之外的更全面的机制（Progress in Energy and Combustion Science，2018，67：31 - 68）。采用改进的方法，对甲烷温和燃烧过程中NO的生成和破坏途径进行了定量研究。结果表明，在1300 K、5%O2条件下，当当量比Φ为0.8时，N2 O中间路线的贡献约占80%，随着Φ的增大，N2 O中间路线的贡献逐渐减小。当Φ>1.0时，NO生成完全由瞬发途径取代N2 O中间途径。发现NNH机制在Φ从0.5到1.5的范围内是不重要的。当Φ < 1.0时，再燃反应对NO生成量的贡献小于10%，当Φ < 1.0 < Φ < 1.1时，再燃反应对NO生成量的贡献急剧增加。
• The existing NO calculation methods are evaluated for methane MILD combustion. • An improved calculation method to quantify the contribution of each NO route is proposed. • The improved calculation method involves thermal, prompt, N 2 O-intermediate, NNH, SNCR, and NO-reburning routes. • The NO formation and destruction route of methane MILD combustion is evaluated using the improved method with two mechanisms. • Two mechanisms perform differently in predicting NO formation via the prompt, N 2 O-intermediate, and NNH routes. Moderate or intense low-oxygen dilution (MILD) combustion has become increasingly attractive because of its ultra-low nitric oxide (NO) emission. Although many efforts have been made to investigate the NO formation and destruction pathways of MILD combustion, their relative contribution still fails to reach an agreement when using previously-developed NO calculation methods. For this reason, these NO calculation methods are first evaluated for methane MILD combustion by the kinetic modeling of a well-stirred reactor (WSR). Then, an improved calculation method for quantifying the contribution of NO sub-routes is proposed, which involves thermal, prompt, N 2 O-intermediate, NNH, selective non-catalytic reduction of NO, and NO-reburning routes. Also, this improved method allows the application of a more comprehensive mechanism ( Progress in Energy and Combustion Science, 2018, 67: 31 – 68 ) other than GRI-Mech 2.11. Using the improved method with the more comprehensive mechanism, the NO formation and destruction routes during methane MILD combustion are quantitatively investigated. The results show that in the WSR at 1300 K with 5% O 2 , the contribution of the N 2 O-intermediate route accounts for about 80% at an equivalent ratio ( Φ ) of 0.8, and it gradually decreases as Φ increases. Once Φ is >1.0, the prompt route surpasses the N 2 O-intermediate route to dominate the NO generation entirely. The NNH mechanism is found to be of little importance at Φ ranging from 0.5 to 1.5. Additionally, the NO-reburning reaction reduces <10% of the total NO production when Φ < 1.0, and its contribution increases abruptly at 1.0 < Φ < 1.1.
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影响因子：
1.5
作者：
P. Malte;D. Pratt
通讯作者：
P. Malte;D. Pratt
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影响因子：
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DOI：
10.1016/s0082-0784(57)80024-1
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期刊：
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影响因子：
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影响因子：
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