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Cristin-resultat-ID:
1702285
Sist endret:
18. april 2020, 16:23
NVI-rapporteringsår:
2019
Resultat
Vitenskapelig artikkel
2019
Combustion and NOx Emission Characteristics of a Bluff Body Hydrogen Burner
Christoph Meraner
Tian Li
Mario Ditaranto
og
Terese Løvås
Tidsskrift
Tidsskrift
Energy & Fuels
ISSN 0887-0624
e-ISSN 1520-5029
NVI-nivå 2
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Om resultatet
Om resultatet
Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Trykket: 2019
Volum: 33
Hefte: 5
Sider: 4598 - 4610
Lenker
Lenker
original online (doi)
https://doi.org/10.1021/acs.energyfuels.9b00313
Importkilder
Importkilder
Scopus-ID: 2-s2.0-85065760698
Scopus-ID: 2-s2.0-85065903529
Beskrivelse
Beskrivelse
Engelsk
Tittel
Combustion and NOx Emission Characteristics of a Bluff Body Hydrogen Burner
Sammendrag
Nitric oxide (NO x ) emissions from a partial premixed bluff body (PPBB) hydrogen burner under varying operational conditions have been investigated numerically. The PPBB burner employs a conical bluff body to stabilize the flame, and its design allows for the dilution of the fuel-air mixture by internally recirculated flue gas. The degree of premixing can be adjusted via primary and secondary fuel ports that are controlled independently. Steady-state computational fluid dynamic (CFD) simulations were conducted for 12 different combinations of secondary fuel fractions and thermal loads to investigate the complex flow structure in the burner and the source of NO x formation. All simulations were validated against experimental data and underpredicted NO x emissions by 7% on average. A detailed analysis of the combustion characteristics was conducted and showed that primary fuel is burned in a multiregime mode at a wide range of mixture fractions/equivalence ratios, while secondary fuel is burned closer to stoichiometry. Utilizing a secondary fuel fraction of 30% (i.e., the base operational condition) leads to a fuel-rich mixture within the inner recirculation zone compared to a fuel-lean mixture when the burner is operated without secondary fuel. The concave mean curvature of the stoichiometric isosurface between primary and secondary fuel leads furthermore to a local peak of the NO x formation rate when the burner operates at its base conditions. The analysis of the mass flow rates in the inner and outer recirculation zones showed that increasing the thermal load reduces the amount of internally recirculated flue gas. The conducted simulations indicate that these effects contribute to an increase in NO x emissions with increasing thermal load and with increasing secondary fuel fraction. © 2019 American Chemical Society.
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Bidragsytere
Bidragsytere
Christoph Meraner
Forfatter
ved Institutt for energi- og prosessteknikk ved Norges teknisk-naturvitenskapelige universitet
Tian Li
Forfatter
ved Institutt for energi- og prosessteknikk ved Norges teknisk-naturvitenskapelige universitet
Mario Ditaranto
Forfatter
ved Termisk energi ved SINTEF Energi AS
Terese Løvås
Forfatter
ved Institutt for energi- og prosessteknikk ved Norges teknisk-naturvitenskapelige universitet
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