Emission characteristics of a novel low NOx burner fueled by hydrogen-rich mixtures with methane

Marcin Dutka, Mario Ditaranto, Terese Løvås


The use of hydrogen-rich fuels may be challenging for burner designers due to unique properties of hydrogen compared
to conventional fuels such as natural gas. Burner retrofit may be required to use hydrogen-enriched fuels in combustion
systems that are designed for natural gas combustion. This study aimed to experimentally investigate NOx emissions
from a novel low NOx burner fueled by methane-hydrogen mixtures. The burner was tested in a cylindrical combustion
chamber at atmospheric pressure. Burner thermal load of 25 kW (LHV) and air-fuel equivalence ratio of 1.15 were
maintained throughout the experimental campaign. The influence of burner design parameters on NOx emissions was
tested for various fuel compositions using a statistically cognizant experimental design. The study revealed that shifting
the burner head upstream can deliver NOx emission reduction. In contrast, supplying fuel to the burner through secondary
fuel ports increases NOx emissions, particularly when the burner head is shifted upstream. The lowest predicted
NOx emissions from the burner are below 9 ppmvd at 3% of O2 and 14 ppmvd at 3% of O2 for 5% and 30% mass
fraction of hydrogen in the fuel, respectively.


low-NOx burner; hydrogen enrichment; nitrogen oxides; central composite design; bluff body

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