The Effect of Power on the NOx Emission of Air Staged NH3,NH3/CH4 Flame
NH3 has the potential to be used as a hydrogen carrier for long-distance hydrogen transportation.However,NH3 flame has low reactivity,poor stability,and high fuel NOx emission.To address these issues,a swirling burner and air staged liner were designed.The effect of power amplification on NOx emissions was experimentally studied,and chemical reactor network(CRN)was used for numerical analysis.The results showed that the NH3 flame NOx was the lowest at 114.4 xl0-6@15％O2 in the case of 5 kW and φpri=1.05.Amplifying power causes NOx increased and incomplete combustion which reduces the optimal φpri,the combustion range and further increases the NOx.Reducing volumetric heat intensity and increasing residence time decrease NOx.Moreover,CRN in this study is more suitable for premixed flame rather than non-premixed flame.Amplifying power does not change the reaction path but the increase in reaction rate for generating NO is faster than that for consuming NO,resulting in an increase in NO.
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