Owing to recent strict legislation, environmental impact of combustion processes is nowadays one of the most important problems involving both scientific community and burner manufacturers. In the case of natural gas combustion, nitric oxides (NOx) reduction is the most critical aim to achieve, often requesting for industrial applications heavy and highcost plant revamping (for instance, adoption of low-NOx burners or burned gases de-NOx treatment). Moreover, although NOx formation mechanisms are today quite understood, many unsolved questions are connected to the interaction between fluid dynamic and chemistry inside the burner device and this makes the CFD codes not yet fully predictive. This paper presents the results obtained for pollutant emissions (nitric oxides and carbon monoxide) upon two different natural gas burner typologies: a swirl burner equipped with two different fuel injectors (co-axial or transverse with respect to the rotating air stream) and a premixed burner with a flame generated downstream a metallic grid. The analysis has been carried out varying the operating conditions of the devices (equivalence ratio, swirl number).
Measurement of NOx and CO emissions in natural gas flames
COGHE, ALDO SEBASTIANO;OLIVANI, ANDREA;SOLERO, GIULIO ANGELO GUIDO
2006-01-01
Abstract
Owing to recent strict legislation, environmental impact of combustion processes is nowadays one of the most important problems involving both scientific community and burner manufacturers. In the case of natural gas combustion, nitric oxides (NOx) reduction is the most critical aim to achieve, often requesting for industrial applications heavy and highcost plant revamping (for instance, adoption of low-NOx burners or burned gases de-NOx treatment). Moreover, although NOx formation mechanisms are today quite understood, many unsolved questions are connected to the interaction between fluid dynamic and chemistry inside the burner device and this makes the CFD codes not yet fully predictive. This paper presents the results obtained for pollutant emissions (nitric oxides and carbon monoxide) upon two different natural gas burner typologies: a swirl burner equipped with two different fuel injectors (co-axial or transverse with respect to the rotating air stream) and a premixed burner with a flame generated downstream a metallic grid. The analysis has been carried out varying the operating conditions of the devices (equivalence ratio, swirl number).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
