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  1. Assessment on NOx formation for CH4/H2/NH3 flame under MILD condition: Effect of air Swirl and ammonia fraction
Assessment on NOx formation for CH4/H2/NH3 flame under MILD condition: Effect of air Swirl and ammonia fraction
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Assessment on NOx formation for CH4/H2/NH3 flame under MILD condition: Effect of air Swirl and ammonia fraction

Mardani, A

Assessment on NOx formation for CH4/H2/NH3 flame under MILD condition: Effect of air Swirl and ammonia fraction

Mardani, A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2024.07.036
  3. Publisher: 2024
  4. Abstract:
  5. In this study, the replacement of hydrogen with ammonia in a laboratory Moderate or Intense Low-Oxygen Dilution (MILD) burner is being investigated by incorporating air swirling to study NOx formation in the flow field. A CH4/H2/NH3 fuel jet is modeled using the RANS (Reynolds-Averaged Navier-Stokes equations) approach for various fuel mixtures with ammonia content ranging from 0% to 18%, while maintaining a constant methane concentration. The study is conducted under two conditions: axial coflow with hot diluted air and swirled with the swirl numbers of 0.6–1.0. The hot oxidizer consists of 9% O2 and 6% O2 at 1300 K. The combustion model is based on the eddy dissipation concept, and a detailed chemical mechanism is used to represent the chemical reactions. Numerical simulations suggest that swirl enhances the reactivity of nitrogen-containing reactions, with the sensitivity to swirl varying based on the inlet ammonia content. The addition of ammonia and air swirling improve the MILD index but reduce the MILD area. Swirling increases the temperature of the reacting field, while ammonia suppresses it. The results indicate the potential of swilr concept for enhanced dilution, improved flexibility in controlling NOx formation, and overcomed the ammonia reativity drwabacks. © 2024 Hydrogen Energy Publications LLC
  6. Keywords:
  7. Hydrogen ; Methane ; MILD combustion ; Ammonia ; Hydrogen ; Methane ; Navier Stokes equations ; Nitrogen oxides ; CH 4 ; Condition ; Fuel jet ; Low oxygen ; Moderate or intense low-oxygen dilution combustion ; NO x ; NOx ; NOx formation ; Oxygen dilution ; Swirl ; Combustion
  8. Source: International Journal of Hydrogen Energy ; Volume 80 , 2024 , Pages 1277-1289 ; 03603199 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0360319924027022