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CH4/NH3 Flame Structure and Extinction Limit under Flame-Flame Interactions
Fanxing Meng1,2, Quanwang Chen3, Bingbing Zheng1,2
1Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China.
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.
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.
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