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This study explores methane/ammonia (CH4/NH3) co-firing flames, revealing that higher ammonia content reduces flame size and stability. These findings are crucial for developing ammonia as a sustainable fuel alternative.

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Area of Science:

  • Combustion science
  • Chemical engineering
  • Energy systems

Background:

  • Ammonia (NH3) is a promising alternative to fossil fuels.
  • Understanding methane/ammonia (CH4/NH3) co-firing is vital for future energy applications.

Purpose of the Study:

  • To investigate the flame structure and stability of CH4/NH3 co-firing.
  • To analyze the impact of ammonia content on flame characteristics and extinction limits.

Main Methods:

  • Experimental study using a double-nozzle burner.
  • Analysis of laminar diffusion flame structure, CH*/OH* intensity, and flame size via ICCD camera.
  • Determination of extinction limits under various conditions.

Main Results:

  • Observed four flame states (merged, merging, separated, independent) based on burner pitch.
  • Higher syngas flow can maintain merging flames.
  • Increased NH3 content led to decreased flame size and reduced flame stability.

Conclusions:

  • Provides experimental data on CH4/NH3 co-firing flame behavior.
  • Offers a theoretical basis for enhancing the stability of methane and ammonia co-combustion.