Evolution of N2O production at lean combustion condition in NH3/H2/air premixed swirling flames

In the development of ammonia - hydrogen blends as potential substitutes for fossil fuels, retrofitting existing devices running at very lean condition is one promising solutions decarbonisation power sector. However, little known about impact these conditions on production NOX, particularly N2O that a potent greenhouse gas. Therefore, influence varying thermal and Reynolds numbers flame emission characteristics, especially N2O, ammonia-hydrogen-air swirling flames has been evaluated first time through use spatially resolved OH*, NH* NH2* chemiluminescence, spectrometry analyses advanced emissions characterisation fixed equivalence ratio, Φ = 0.65, representative Dry Low NOX (DLN) approach in traditional stationary gas turbines. NO NO2 were found to be decreasing (from ∼ 5000 ppmv 1000 ppmv; from 150 50 NO2) with increasing content 50% 90%) fuel while followed reverse trends 200 ppmv). More than 80% exhibited high amounts unreacted fractions (∼ 100 1200 ppmv), which can potentially linked instability and/or low temperatures. Furthermore, any or fraction made more extreme by number due differences relevant radicals (NH, OH, NH2 etc.) formation flames. Experimental results suggest unviability conventional utilised DLN applications excessive emissions. Detailed sensitivity concentration post zone carried out utilising Ansys Chemkin-PRO identify investigate reactions responsible formation/consumption experimental Results have identified reaction NH + ↔ H major source flame, N2 OH N2O(+M) O(+M) are consumption zone, higher reactivity latter longer residence relatively lower