Vliv geometrie hořáku se stupňovitým přívodem plynu na tvorbu oxidů dusíku

Influence of burner geometry with staged gas supply on the formation of nitrogen oxides

conference paper

en

The present paper describes the influence of seven important geometry parameters of gas burner with staged fuel supply on the formation of nitrogen oxides. Large number of experiments was carried out using a staged gas burner with nominal heat duty of 1000 kW. Natural gas was used as the fuel. The burner was installed in a horizontal water-cooled combustion chamber. The tests were aimed at analyzing the influence of seven geometry factors (for example geometry of swirl generator and secondary nozzle heads) on the formation of nitrogen oxides. Formation of nitrogen oxides was not the only observed dependent variable. Other variables include carbon monoxide emissions, as well as the shape and structure of visible flame. From the evaluation of measured data it follows that by means of geometry optimization of certain burner components it is possible to reduce the formation of nitrogen oxides by up to about 60%, while securing stable flame with the required shape.

Prezentovaná práce popisuje vliv sedmi důležitých parametrů plynového hořáku se stupňovitým přívodem paliva na tvorbu oxidů dusíku. Vysoký počet experimentů byl proveden s plynovým hořákem o nominálním výkonu 1000kW. Jako palivo byl použit zemní plyn. Hořák byl nainstalován na horizontální spalovací komoře, která byla vodou chlazená. Cílem experimentů bylo posoudit vliv sedmi geometrických parametrů hořáku (např. geometrie vířiče, geometrie sekundárních trysek) na tvorbu oxidů dusíku. V průběhu experimentu nebyla sledována pouze tvorba oxidů dusíku. Dalšími pozorovanými veličinami byly emise oxidu uhelnatého, tvar a struktura viditelného plamene. Analýza naměřených dat odhalila, že optimálním nastavením geometrických parametrů hořáku lze dosáhnout redukce oxidů dusíku až o 60 procent, zatímco stablita a požadovaný tvar plamene jsou zajištěny.

The present paper describes the influence of seven important geometry parameters of gas burner with staged fuel supply on the formation of nitrogen oxides. Large number of experiments was carried out using a staged gas burner with nominal heat duty of 1000 kW. Natural gas was used as the fuel. The burner was installed in a horizontal water-cooled combustion chamber. The tests were aimed at analyzing the influence of seven geometry factors (for example geometry of swirl generator and secondary nozzle heads) on the formation of nitrogen oxides. Formation of nitrogen oxides was not the only observed dependent variable. Other variables include carbon monoxide emissions, as well as the shape and structure of visible flame. From the evaluation of measured data it follows that by means of geometry optimization of certain burner components it is possible to reduce the formation of nitrogen oxides by up to about 60%, while securing stable flame with the required shape.

Geometrie hořáku, zkoušky hořáků, tvorba oxidů dusíku

Burner design, burner geometry, burner testing, nitrogen oxides formation

2008

25.03.2008

Cenertec - Centro de Energia e Tecnologia

Rio Tinto

978-972-99309-3-5

Conference CD - Proceedings of the 8th European conference on Industrial Furnaces and Boilers

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