Numerical study on a novel burner designed to improve MILD combustion behaviors at the oxygen enriched condition
Numerical study on a novel burner designed to improve MILD combustion behaviors at the oxygen enriched condition
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一种旨在改善富氧条件下 MILD 燃烧行为的新型燃烧器的数值研究
DOI：
10.1016/j.applthermaleng.2019.02.023
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发表时间：
2019-04
影响因子：
6.4
通讯作者：
Liu Hao
中科院分区：
文献类型：
--
作者：
Xie Yihao;Tu Yaojie;Jin Hu;Luan Congcong;Wang Zean;Liu Hao
尽管富氧燃烧（OEC）具有更高的效率，但其存在高NOx排放的问题。为了推广应用，本文提出了一种新的概念燃烧器，它可以保持高效率，同时有效地降低NOx的排放。该燃烧器基本上是基于中等或强烈低氧稀释（MILD）燃烧的概念开发的，但进一步的新奇在于通过惰性气流隔离燃料和氧气，这是为了推迟燃料和氧气之间的反应，并加速建立温和的燃烧制度。CFD（计算流体动力学）模拟工作已经在三种氧浓度下进行（19.5%，23%和26.5%），以研究新型燃烧器的燃烧特性，并对采用原始MILD燃烧器的实验情况进行详细验证。在三种氧浓度下，比较了本燃烧器和原始燃烧器的温度和组分分布以及NOx排放。计算结果表明，在三种氧浓度下，采用新型燃烧器可使原始燃烧器的峰值温度分别降低106 K、62 K和58 K。同时，在三种氧浓度下，温度的标准偏差在特殊线上减小24-54%，在对称平面上均减小约10%。这些观察结果表明，通过使用新的燃烧器，这主要是由于扩展的反应区，以及延迟的反应，提高了温度分布的均匀性。在氧浓度为19.5%、23%和26.5%时，采用新型燃烧器可使NOx排放分别降低到原来的1/8、1/5和1/2。
Despite the higher efficiency, oxygen-enriched combustion (OEC) suffers from high NOx emission. To promote its application, this paper proposes a new conceptual burner which could maintain the high efficiency while effectively reduce NOx emission. The burner is basically developed based on the concept of moderate or intense low-oxygen dilution (MILD) combustion, but the further novelty lies in the isolation of fuel and oxygen by an inert gas stream, which is supposed to postpone the reaction between fuel and oxygen and accelerate the establishment of MILD combustion regime.CFD (Computational Fluid Dynamics) simulation work has been conducted under three oxygen concentrations (19.5%,23%, and26.5%) to investigate the combustion behaviors of the novel burner following a detailed validation of the experimental case employing the original MILD combustion burner. Comparisons are made between the present proposed burner and the original burner in terms of temperature and species distributions, as well as NOx emission, for the three oxygen concentrations. The numerical results show that applying the novel burner can reduce the peak temperature obtained with the original burner by 106 K, 62 K and 58 K in three oxygen concentrations respectively. Meanwhile, the standard deviations of the temperature decreases by 24–54% in the special line, and all approximately 10% in the symmetric plane in the three oxygen concentrations. These observations suggest the enhanced uniformity of temperature distribution by using the novel burner, which is mainly due to the extended reaction zone together with the postponed reaction. As a result of the well-established MILD combustion status, the NOx emission can be reduced to1/8,1/5and1/2of the original magnitude when using the novel burner at the oxygen concentration19.5%,23%, and26.5%respectively.
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影响因子：
5.3
作者：
W. Chen;L. Smoot;S. C. Hill;T. Fletcher
通讯作者：
W. Chen;L. Smoot;S. C. Hill;T. Fletcher
影响因子：
11.9
作者：
M. Katsuki;T. Hasegawa
通讯作者：
M. Katsuki;T. Hasegawa
影响因子：
6.4
作者：
S. Hong;D. Noh;Eun Kyung Lee
通讯作者：
S. Hong;D. Noh;Eun Kyung Lee
DOI：
10.1017/9781108671422.007
发表时间：
2021-05
期刊：
Advanced Turbulent Combustion Physics and Applications
影响因子：
--
作者：
Y. Minamoto;N. Doan;N. Swaminathan
通讯作者：
Y. Minamoto;N. Doan;N. Swaminathan
影响因子：
5.3
作者：
Manabendra Saha;A. Chinnici;B. Dally;P. Medwell
通讯作者：
Manabendra Saha;A. Chinnici;B. Dally;P. Medwell