The effect of acoustic frequency on pollutants emissions from a premixed gas combustor has been investigated. A significant decrease (down to 61.5%) in nitrogen oxide (NO) emissions was observed in the presence of acoustic oscillation (two opposite square waves) in a premixed flame. Although the overall production of the pollutants is reduced, the reduction rate depends on the frequency and the direction of the acoustic field. It is shown that the acoustic effect can be considered as a possible alternative to flue gas reburn technology to achieve the same or even better effectiveness in NOx and CO pollutants reduction with much less cost.
