The role of a burner head choke in NOx reduction
Book
·
OSTI ID:489042
- Gordon-Piatt Energy Group, Winfield, KS (United States)
The emission of NOx and CO from flames of burners are a major nuisance for the boiler and burner industry. The current EPA legislation have restricted the emissions of NOx and CO from natural gas commercial burners to 30 ppm (25 ppm in Southern California) and 200 ppm, corrected to 3% O{sub 2}, respectively. The recent experiments performed at the authors` laboratory on low NOx gas burners in a 1 MW refractory steam generator have shown that significant improvement in NOx emissions, without increasing CO, is possible by mounting a converging cone (choke) on the head of a conventional gas burner. A burner mounted with a choke produces up to 405 less NOx than a burner without a choke. The oxides of nitrogen could be further reduced to meet the EPA requirements by using Steam Injection (SI) or external Flue Gas Recirculation(FGR). Due to the already low levels of NOx emission with a choked burner, very little amount of SI or FGR is needed. The flue gas composition at different excess air levels and varying equivalence ratios are plotted. The effect of NOx emission on the amount of FGR and SI is also shown.
- OSTI ID:
- 489042
- Report Number(s):
- CONF-970146--; ISBN 1-890277-04-5
- Country of Publication:
- United States
- Language:
- English
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