June 16, 2025

The Effects of Secondary Air Staging Location, Pressure and Humidification on NOx Emissions for a High Ammonia Blend in Premixed Swirl Combustion

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Lower NOx emissions were consistently achieved with anhydrous ammonia compared to humidified blends, indicating fuel characteristics impact emissions.
Introducing secondary air at varied locations and pressures showed a significant reduction of NO emissions, by as much as 24% under specific conditions.
Combustion experiments involved a premixed swirl burner with ammonia and hydrogen-rich gases under controlled pressure settings.
Flame structure and emissions were influenced by secondary air mixing, emphasizing the importance of staging in combustion efficiency.

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Experimental analysis reveals secondary air staging reduces NOx emissions in ammonia combustion, highlighting combustion dynamics.

Hewlett et al. (2025) studied this question.

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