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NOx formation in hydrogen–methane turbulent diffusion flame under the moderate or intense low-oxygen dilution conditions

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  • Gao, Xuan
  • Duan, Fei
  • Lim, Seng Chuan
  • Yip, Mee Sin

Abstract

A numerical study of NOx emission in hydrogen–methane non-premixed flame has been conducted under the moderate or intense low-oxygen dilution (MILD) conditions. In the simulation, the Eddy Dissipation Concept (EDC) model is applied. The predictions are validated by the experimental results for the three flames with the oxygen mass fraction varying from 3% to 9%. The model with the detailed chemical mechanisms can succeed in capturing the trend lines of NO level and predicting the NO formation at the low oxygen level. The simulation indicates that the low oxygen level leads to suppression of the NO formation. Analysis of the NO formation mechanisms shows that the NNH and prompt routes play a significant role in the NO formation under the MILD conditions. The effects of the coflow air temperature and hydrogen concentration in the fuel mixture on the NO formation are taken into account in the study. The results demonstrate that a decrease in fuel hydrogen concentration or a low coflow air temperature contributes to suppression of the NO formation.

Suggested Citation

  • Gao, Xuan & Duan, Fei & Lim, Seng Chuan & Yip, Mee Sin, 2013. "NOx formation in hydrogen–methane turbulent diffusion flame under the moderate or intense low-oxygen dilution conditions," Energy, Elsevier, vol. 59(C), pages 559-569.
    • Handle: RePEc:eee:energy:v:59:y:2013:i:c:p:559-569
    DOI: 10.1016/j.energy.2013.07.022
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    16. Maria Grazia De Giorgi & Aldebara Sciolti & Stefano Campilongo & Antonio Ficarella, 2017. "Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges," Energies, MDPI, vol. 10(3), pages 1-15, March.
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    18. De la Cruz-Ávila, M. & Martínez-Espinosa, E. & Polupan, Georgiy & Vicente, W., 2017. "Numerical study of the effect of jet velocity on methane-oxygen confined inverse diffusion flame in a 4 Lug-Bolt array," Energy, Elsevier, vol. 141(C), pages 1629-1649.
    19. Zhao, Hao & Dana, Alon G. & Zhang, Zunhua & Green, William H. & Ju, Yiguang, 2018. "Experimental and modeling study of the mutual oxidation of N-pentane and nitrogen dioxide at low and high temperatures in a jet stirred reactor," Energy, Elsevier, vol. 165(PB), pages 727-738.
    20. Li, Zhiyi & Cuoci, Alberto & Sadiki, Amsini & Parente, Alessandro, 2017. "Comprehensive numerical study of the Adelaide Jet in Hot-Coflow burner by means of RANS and detailed chemistry," Energy, Elsevier, vol. 139(C), pages 555-570.
    21. He, Yizhuo & Zou, Chun & Song, Yu & Liu, Yang & Zheng, Chuguang, 2016. "Numerical study of characteristics on NO formation in methane MILD combustion with simultaneously hot and diluted oxidant and fuel (HDO/HDF)," Energy, Elsevier, vol. 112(C), pages 1024-1035.
    22. 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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