Stability, near flashback combustion dynamics, and NOx emissions of H2/N2/air flames in a micromixer-based model gas turbine combustor

Ahmed Abdelhafez, Ahmed Abdelhalim, Gubran A.Q. Abdulrahman, Md Azazul Haque, Mohamed A. Habib, Medhat A. Nemitallah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study experimentally investigates stability, near flashback dynamics, and NOx emissions arising from H2/N2 flames in a micromixer-based burner for gas turbine combustion applications. Generalized stability maps were generated and NOx emissions and temperature profiles were recorded. Two distinct flashback modes are revealed at each hydrogen fraction (HF), with intense audible loud noise (dynamic instabilities) during flashback mode 1, followed by the actual flashback (flashback mode 2) occurrence. Shorter combustors are needed for more stable H2 flames. The onset of acoustic perturbations (flashback mode 1) is observed to occur consistently at a constant adiabatic flame temperature (AFT) of ∼1800 K. A uniform temperature profile, a smaller profile factor (PF), is reported at the different HFs. The lean cold combustion conditions minimized NOx emissions to the single-digit ppm level despite rising the AFT.

Original languageEnglish
Pages (from-to)102-112
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume61
DOIs
StatePublished - 3 Apr 2024

Bibliographical note

Publisher Copyright:
© 2024 Hydrogen Energy Publications LLC

Keywords

  • Blowout limit
  • Clean combustion
  • Cracked ammonia combustion
  • Hydrogen combustion
  • Micromixer combustor
  • NOx emissions

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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