Abstract
ABSTRACT A study of the effects of combustion air dilution by water vapor or nitrogen on NOx emission in a premixed turbulent natural gas flame was performed for lean conditions. NOx concentrations were measured with dry air, water vapor dilution or nitrogen dilution of the combustion air at varying air factor at three different power/pressure settings. Results showed for all cases a significant reduction in NOx emission as an effect of combustion air dilution by water vapor and nitrogen for constant Tad. The results also showed that the reducing effect of water vapor dilution is larger than the reducing effect of nitrogen dilution. It is therefore concluded that water vapor dilution of the combustion air not only reduces NOx emission in premixed turbulent flames by lowering flame temperature and oxygen deficiency, but also by chemical action.
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