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Study of NOx emission characteristics in CH4/air non-premixed flames with exhaust gas recirculation

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  • Yu, Byeonghun
  • Lee, Seungro
  • Lee, Chang-Eon

Abstract

In this study, the characteristics of NOx emissions for CH4/air non-premixed flames using EGR (exhaust gas recirculation) methods were investigated using the AI-EGR (air-induced-EGR) and FI-EGR (fuel-induced-EGR) methods. For the fundamental experiment, coaxial non-premixed flames were verified using the non-premixed mode in a changeable EGR hybrid combustion system. For the numerical simulation, the 2-D commercial FLUENT program was used to verify the distributions of the flame temperature and mole fraction of the NO emissions. Additionally, the swirling non-premixed flames were tested to investigate a practical combustion system. Based on experimental results, the reduction rates of EINOX for the FI-EGR method and the AI-EGR were approximately 29% and 28% for an EGR ratio of 20% and 25%, respectively, which represented the maximum range needed to generate a stable flame. Based on numerical results, the FI-EGR method was determined to be more effective than the AI-EGR method in reducing NOx emission because the high temperature region and the OH distribution region of the FI-EGR method were narrower. According to the results from the swirling flames, the reduction rates of EINOX for the FI-EGR method and the AI-EGR were approximately 49% and 45% for an EGR ratio of 15% and 25%, respectively.

Suggested Citation

  • Yu, Byeonghun & Lee, Seungro & Lee, Chang-Eon, 2015. "Study of NOx emission characteristics in CH4/air non-premixed flames with exhaust gas recirculation," Energy, Elsevier, vol. 91(C), pages 119-127.
    • Handle: RePEc:eee:energy:v:91:y:2015:i:c:p:119-127
    DOI: 10.1016/j.energy.2015.08.023
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    References listed on IDEAS

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    1. Shen, Wenkai & Xing, Chang & Liu, Haiqing & Liu, Li & Hu, Qiming & Wu, Guohua & Yang, Yujia & Wu, Shaohua & Qiu, Penghua, 2022. "Exhaust gas recirculation effects on flame heat release rate distribution and dynamic characteristics in a micro gas turbine," Energy, Elsevier, vol. 249(C).
    2. Yang, Xiao & He, Zhihong & Qiu, Penghua & Dong, Shikui & Tan, Heping, 2019. "Numerical investigations on combustion and emission characteristics of a novel elliptical jet-stabilized model combustor," Energy, Elsevier, vol. 170(C), pages 1082-1097.
    3. Nemitallah, Medhat A. & Kewlani, Gaurav & Hong, Seunghyuck & Shanbhogue, Santosh J. & Habib, Mohamed A. & Ghoniem, Ahmed F., 2016. "Investigation of a turbulent premixed combustion flame in a backward-facing step combustor; effect of equivalence ratio," Energy, Elsevier, vol. 95(C), pages 211-222.

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