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The Effect of Diluents on the Flame Structure and NO Generation Characteristics of H 2 /CO Micromixing Flames

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  • Wentong Wang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150006, China)

  • Dengke Chen

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150006, China)

  • Wenkun Zhu

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150006, China)

  • Rui Sun

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150006, China)

Abstract

This paper uses numerical simulation to investigate the effects of diluents on the flame structure and NO generation of H 2 /CO micromixing flames. The results show that under the same thermal power condition, the diluents reduce the flame temperature and decrease the combustion reaction rate and flame propagation velocity. In addition, the diluents downsize the flame and force it downstream. With an increase in the diluent fraction, these trends are amplified. The NO production decreases due to the diluents, and the NO is lowest when H 2 O is added. When the diluents are CO 2 and H 2 O, the NO generation is dominated by the reactants’ concentration. This results in the lowest temperature not corresponding to the lowest NO production. The diluents also reduce the sensitivity of the NO production to the temperature, and the CO 2 diluent highly weakens the sensitivity.

Suggested Citation

  • Wentong Wang & Dengke Chen & Wenkun Zhu & Rui Sun, 2023. "The Effect of Diluents on the Flame Structure and NO Generation Characteristics of H 2 /CO Micromixing Flames," Energies, MDPI, vol. 16(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1252-:d:1045363
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    References listed on IDEAS

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    1. Zhang, Guo-Peng & Li, Guo-Xiu & Li, Hong-Meng & Lv, Jia-Cheng, 2022. "Effect of diluent gas on propagation and explosion characteristics of hydrogen-rich syngas laminar premixed flame," Energy, Elsevier, vol. 246(C).
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