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Hydrogen addition to a commercial self-aspirating burner and assessment of a practical burner modification strategy to improve performance.

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Title: Hydrogen addition to a commercial self-aspirating burner and assessment of a practical burner modification strategy to improve performance.
Authors: Gee, Adam J.1 (AUTHOR) adam.gee@adelaide.edu.au, Proud, Douglas B.1 (AUTHOR), Smith, Neil2 (AUTHOR), Chinnici, Alfonso1 (AUTHOR), Medwell, Paul R.1 (AUTHOR)
Source: International Journal of Hydrogen Energy. Jan2024:Part B, Vol. 49, p59-76. 18p.
Subjects: Heat radiation & absorption, Hydrogen, Alternative fuels, Diameter, Nitrogen oxides emission control
Abstract: The ability for existing burners to operate safely and efficiently on hydrogen-blended fuels is a primary concern for the many industries looking to adopt hydrogen as an alternative fuel. This study investigates the efficacy of increasing fuel injector diameter as a simple modification strategy to extend the hydrogen-blending limits before flashback. The collateral effects of this modification are quantified with respect to a set of key performance criteria. The results show that the unmodified burner can sustain up to 50 vol% hydrogen addition before flashback. Increasing the fuel injector diameter reduces primary aeration, allowing for stable operation on up to 100% hydrogen. The flame length, visibility and radiant heat transfer properties are all increased as a result of the reduced air entrainment with a trade-off reported for NOx emissions, where, in addition to the effects of hydrogen, reducing air entrainment further increases NOx emissions. • Flashback limit of a self-aspirating burner extended up to 100 vol% H 2 by increasing d jet. • Primary air entrainment is reduced by increasing d jet. • Positive non-linear relationship between equivalence ratio and flame length. • Negligible reductions in radiant heat transfer with H 2 addition under in modified burner. • Negative linear relationship between NOx emissions and equivalence ratio. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The ability for existing burners to operate safely and efficiently on hydrogen-blended fuels is a primary concern for the many industries looking to adopt hydrogen as an alternative fuel. This study investigates the efficacy of increasing fuel injector diameter as a simple modification strategy to extend the hydrogen-blending limits before flashback. The collateral effects of this modification are quantified with respect to a set of key performance criteria. The results show that the unmodified burner can sustain up to 50 vol% hydrogen addition before flashback. Increasing the fuel injector diameter reduces primary aeration, allowing for stable operation on up to 100% hydrogen. The flame length, visibility and radiant heat transfer properties are all increased as a result of the reduced air entrainment with a trade-off reported for NOx emissions, where, in addition to the effects of hydrogen, reducing air entrainment further increases NOx emissions. • Flashback limit of a self-aspirating burner extended up to 100 vol% H 2 by increasing d jet. • Primary air entrainment is reduced by increasing d jet. • Positive non-linear relationship between equivalence ratio and flame length. • Negligible reductions in radiant heat transfer with H 2 addition under in modified burner. • Negative linear relationship between NOx emissions and equivalence ratio. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2023.06.230