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Characteristics of NOx emissions of counterflow nonpremixed water-laden methane/air flames

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  • Lee, Seungro
  • Shin, Cheol Hee
  • Choi, Sun
  • Kwon, Oh Chae

Abstract

A computational investigation on the characteristics of nitrogen oxides (NOx) emissions for counterflow nonpremixed water (H2O)-laden methane (CH4)/air flames is conducted since a detailed observation of NOx formation for fuel having naturally high H2O vapor content is necessary. Using a detailed kinetic mechanism, NOx emissions are predicted for low and high flame strain rates (a), and the reaction paths are investigated. With H2O addition NOx emissions are reduced due to the chemical process as well as the thermal process such as diluting and cooling effects, the latter is more dominant than the former in NOx reduction, and the thermal and prompt NO mechanisms become less dominant for the chemical process. With increasing a, NOx emissions are also reduced, and it is mainly due to the thermal process. Reaction NH + O = NO + H in the prompt pathway is the major reaction step that results in reducing NO emissions via the chemical process due to H2O addition for both low- and high-stretched flames, though reaction N + OH = NO + H in the thermal pathway is also the major reaction step for the high-stretched flames. In addition, for the high-stretched flames the NO2 pathway in NO production becomes relatively more important with H2O addition.

Suggested Citation

  • Lee, Seungro & Shin, Cheol Hee & Choi, Sun & Kwon, Oh Chae, 2018. "Characteristics of NOx emissions of counterflow nonpremixed water-laden methane/air flames," Energy, Elsevier, vol. 164(C), pages 523-535.
    • Handle: RePEc:eee:energy:v:164:y:2018:i:c:p:523-535
    DOI: 10.1016/j.energy.2018.09.017
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    References listed on IDEAS

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    1. Kang, Yinhu & Wang, Quanhai & Lu, Xiaofeng & Wan, Hu & Ji, Xuanyu & Wang, Hu & Guo, Qiang & Yan, Jin & Zhou, Jinliang, 2015. "Experimental and numerical study on NOx and CO emission characteristics of dimethyl ether/air jet diffusion flame," Applied Energy, Elsevier, vol. 149(C), pages 204-224.
    2. Lee, Seungro & Padilla, Rosa & Dunn-Rankin, Derek & Pham, Trinh & Kwon, Oh Chae, 2015. "Extinction limits and structure of counterflow nonpremixed H2O-laden CH4/air flames," Energy, Elsevier, vol. 93(P1), pages 442-450.
    3. Lee, Seungro & Ha, Heonrok & Dunn-Rankin, Derek & Kwon, Oh Chae, 2017. "Effects of pressure on structure and extinction limits of counterflow nonpremixed water-laden methane/air flames," Energy, Elsevier, vol. 134(C), pages 545-553.
    4. Cheong, Kin-Pang & Li, Pengfei & Wang, Feifei & Mi, Jianchun, 2017. "Emissions of NO and CO from counterflow combustion of CH4 under MILD and oxyfuel conditions," Energy, Elsevier, vol. 124(C), pages 652-664.
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    Cited by:

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    2. Yang, Xiehe & Wang, Tiantian & Zhang, Yang & Zhang, Hai & Wu, Yuxin & Zhang, Jiansheng, 2022. "Hydrogen effect on flame extinction of hydrogen-enriched methane/air premixed flames: An assessment from the combustion safety point of view," Energy, Elsevier, vol. 239(PC).

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