Control of emissions from partially cracked ammonia flames by heat loss management

mplementation of renewably produced ammonia as a zero-carbon fuel faces challenges relating to emissions of NOx and unburned NH3. This study employs a premixed atmospheric swirl burner with integrated cooling channels to examine the effects on emissions of NO, NO2, N2O, NH3 and H2 by managing heat loss from the flame. A blend of 0.67/0.25/0.08 (mol.) NH3/H2/N2, representing 20 % (vol.) cracked ammonia was used with a constant net thermal power of 10 kW. For the range of equivalence ratios 0.7 < Φ < 1.3, two heat loss cases were assessed. A comparison was made between a conventional baseline configuration, and a secondary case with additional heat loss added by flowing 16 g/s of water through the burner face. A previously developed chemical reactor network (CRN) was utilised to investigate the main reactions responsible for emissions differences.The emissions data of NO, NO2, N2O, NH3 and H2 (units: ppmv or %v, dry 15% O2) for the two heat loss cases examined at a range of equivalence ratios (units: a.u.) are available in a .xlsx file. The format of this data has equivalence ratio in column B, with the corresponding mean emissions values of the two cases in columns C and D. Rows 5 to 11 cover NO emissions, rows 15 to 21 cover NO2 emissions, rows 25 to 31 cover N2O emissions, rows 35 to 42 cover NH3 emissions and rows 45 to 52 cover H2 emissions. Column F repeats the same data as column B (equivalence ratio) and columns G and H show the corresponding error bar values in each direction for the mean emissions values in columns C and D.