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Extinction limits and structure of counterflow nonpremixed methane-ammonia/air flames

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  • Ku, Jae Won
  • Choi, Sun
  • Kim, Hee Kyung
  • Lee, Seungro
  • Kwon, Oh Chae

Abstract

An experimental and computational investigation on the fundamental combustion characteristics of methane (CH4)-ammonia (NH3) blends is conducted to confirm their potential as a clean fuel with low carbon dioxide (CO2) emissions and determine their reasonable burning conditions, considering counterflow nonpremixed CH4NH3/air flames. Extinction limits and structure of the nonpremixed CH4NH3/air flames are measured and predicted. Results show that flames gradually become orange and the flame thickness increases with NH3 addition, compared with the pure CH4/air flames. Also, flames can sustain less NH3 at high strain rates. Compared with the pure CH4/air flames, CH4NH3/air flames exhibit remarkable reduction of CO2 emissions with moderate reduction of combustion stability limits and no remarkable temperature drop in the flame, supporting the potential of CH4NH3 blends as a clean fuel with low CO2 emissions. However, additional investigations for reducing the enhanced NOx emissions mainly via the fuel NOx mechanism with NH3 addition are needed. Finally, the quantitative discrepancy among the present measurements and predictions merits the development of a new reaction mechanism which is optimized for the reaction of CH4NH3 fuel blends and air.

Suggested Citation

  • Ku, Jae Won & Choi, Sun & Kim, Hee Kyung & Lee, Seungro & Kwon, Oh Chae, 2018. "Extinction limits and structure of counterflow nonpremixed methane-ammonia/air flames," Energy, Elsevier, vol. 165(PA), pages 314-325.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pa:p:314-325
    DOI: 10.1016/j.energy.2018.09.113
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    References listed on IDEAS

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    1. 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.
    2. Choi, Sun & Lee, Seungro & Kwon, Oh Chae, 2015. "Extinction limits and structure of counterflow nonpremixed hydrogen-doped ammonia/air flames at elevated temperatures," Energy, Elsevier, vol. 85(C), pages 503-510.
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    Cited by:

    1. Lopez, Luis & Giusti, Andrea & Gutheil, Eva & Olguin, Hernan, 2022. "On the effects of the fuel injection phase on heat release and soot formation in counterflow flames," Energy, Elsevier, vol. 254(PB).
    2. Ku, J.W. & Ahn, Y.J. & Kim, H.K. & Kim, Y.H. & Kwon, O.C., 2020. "Propagation and emissions of premixed methane-ammonia/air flames," Energy, Elsevier, vol. 201(C).
    3. Xu, Cangsu & Wang, Hanyu & Oppong, Francis & Li, Xiaolu & Zhou, Kangquan & Zhou, Wenhua & Wu, Siyuan & Wang, Chongming, 2020. "Determination of laminar burning characteristics of a surrogate for a pyrolysis fuel using constant volume method," Energy, Elsevier, vol. 190(C).
    4. Wenkai Yang & Ashraf N. Al Khateeb & Dimitrios C. Kyritsis, 2022. "The Effect of Hydrogen Peroxide on NH 3 /O 2 Counterflow Diffusion Flames," Energies, MDPI, vol. 15(6), pages 1-17, March.
    5. Yang, Ke & Chen, Kaifeng & Ji, Hong & Xing, Zhixiang & Hao, Yongmei & Wu, Jie & Jiang, Juncheng, 2021. "Experimental study on the effect of modified attapulgite powder with different outlet blockage ratios on methane-air explosion," Energy, Elsevier, vol. 237(C).
    6. Kang, Yinhu & Wang, Qiang & Zhang, Pengyuan & Liu, Congcong & Lu, Xiaofeng & Wang, Quanhai, 2020. "Study on flame structure and extinction mechanism of dimethyl ether spherical diffusion flames," Energy, Elsevier, vol. 193(C).

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