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A Comparative Study of NO x Emission Characteristics in a Fuel Staging and Air Staging Combustor Fueled with Partially Cracked Ammonia

Author

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  • Namsu Kim

    (Energy Efficiency Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea)

  • Minjung Lee

    (Energy Efficiency Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea)

  • Juwon Park

    (Energy Efficiency Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea
    Department of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea)

  • Jeongje Park

    (Energy Efficiency Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea
    Department of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea)

  • Taesong Lee

    (Energy Efficiency Division, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea)

Abstract

Recently, ammonia is emerging as a potential source of energy in power generation and industrial sectors. One of the main concerns with ammonia combustion is the large amount of NO emission. Air staging is a conventional method of reducing NO emission which is similar to the Rich-Burn, Quick-Mix, Lean-Burn (RQL) concept. In air-staged combustion, a major reduction of NO emission is based on the near zero NO emission at fuel-rich combustion of NH 3 /Air mixture. A secondary air stream is injected for the oxidation of unburned hydrogen and NH x . On the other hand, in fuel-staged combustion, NO emission is reduced by splitting NH 3 injection, which promotes the thermal DeNO x process. In this study, NO x emission characteristics of air-staged and fuel-staged combustion of partially cracked ammonia mixture are numerically investigated. First, the combustion system is modeled by a chemical reactor network of a perfectly stirred reactor and plug flow reactor with a detailed chemistry mechanism. Then, the effects of ammonia cracking, residence time, and staging scheme on NO x emission are numerically analyzed. Finally, the limitations and optimal conditions of each staging scheme are discussed.

Suggested Citation

  • Namsu Kim & Minjung Lee & Juwon Park & Jeongje Park & Taesong Lee, 2022. "A Comparative Study of NO x Emission Characteristics in a Fuel Staging and Air Staging Combustor Fueled with Partially Cracked Ammonia," Energies, MDPI, vol. 15(24), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9617-:d:1007568
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    References listed on IDEAS

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