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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN Imprimir: 2150-3621
ISSN En Línea: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v8.i1.60
pages 81-93

CORRELATIONS FOR NOx EMISSIONS FROM A SWIRL BURNER CONCEPT

O. Spangelo
Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Otto K. Sonju
Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

SINOPSIS

NOx emissions have been measured from a low NOx Swirl Burner concept at various geometrical sizes (400 kW, 200 kW, and 10 kW) in different boilers using propane as fuel. The measured emissions of NOx expressed as the emission index of NOx (ELNOx) multiplied by ρ0u0/d0 have been found to be proportional to Fr for confinement ratios (boiler to burner diameter ratio) below 8. This result implies that the flame volume is the leading-order parameter for NOx formation in these burners. It has further been found that heat extraction from the Swirl Burner is enhanced by high confinement ratios (>8) and by low combustion chamber wall temperatures. Measurements of flame heights using laser-induced fluorescence (Spangelo, 2004) have indicated that the flame volume is reduced with increased thermal load when the confinement ratio is higher than 8. This is due to enhanced heat extraction, especially from the postflame region, at high confinement ratios.


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