Achieving net-zero CO₂ emissions in Europe requires substantial investment in renewable energy technologies. Hydrogen, as a carbon-free energy carrier, offers a promising solution for storing and utilizing renewable energy on demand, replacing hydrocarbons in sectors such as power generation, heating, and aeronautical propulsion. However, challenges such as high reactivity, flame temperature, flashback propensity, NOₓ emissions, and thermoacoustic instabilities hinder its adoption in combustion systems, particularly in premixed configurations. This study aims to experimentally evaluate an atmospheric, partially premixed dual-swirl burner with radial air staging, operating on 100% hydrogen. The objective is to investigate how a key operating parameter, such as secondary swirl intensity, affects NOₓ emissions and flame morphology. The burner consists of two coaxial tubes: the inner tube injects a tangential air stream into a hydrogen flow, creating a rich combustion zone near the injector outlet to prevent flashback and reduce temperatures. Secondary air is introduced through the outer tube to achieve globally lean conditions and suppress NOₓ emissions. NOₓ emissions were analyzed under varying operating conditions, while UV imaging was used to characterize the flame morphology.
Experimental characterization of emissions and flame morphology of a partially-premixed dual-swirl 100% hydrogen burner
Francesca Iapaolo;Fabio Cozzi;
2025-01-01
Abstract
Achieving net-zero CO₂ emissions in Europe requires substantial investment in renewable energy technologies. Hydrogen, as a carbon-free energy carrier, offers a promising solution for storing and utilizing renewable energy on demand, replacing hydrocarbons in sectors such as power generation, heating, and aeronautical propulsion. However, challenges such as high reactivity, flame temperature, flashback propensity, NOₓ emissions, and thermoacoustic instabilities hinder its adoption in combustion systems, particularly in premixed configurations. This study aims to experimentally evaluate an atmospheric, partially premixed dual-swirl burner with radial air staging, operating on 100% hydrogen. The objective is to investigate how a key operating parameter, such as secondary swirl intensity, affects NOₓ emissions and flame morphology. The burner consists of two coaxial tubes: the inner tube injects a tangential air stream into a hydrogen flow, creating a rich combustion zone near the injector outlet to prevent flashback and reduce temperatures. Secondary air is introduced through the outer tube to achieve globally lean conditions and suppress NOₓ emissions. NOₓ emissions were analyzed under varying operating conditions, while UV imaging was used to characterize the flame morphology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
