Combustion performances of premixed ammonia/hydrogen/air laminar and swirling flames for a wide range of equivalence ratios

S. Mashruk (1) , S.E. Zitouni (2) , Pierre Brequigny (2) , C. Mounaim-Rousselle (2) , A. Valera-Medina (1)

1 Cardiff University
2 PRISME - Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique

Ammonia, a carbon-free source of hydrogen has recently gained considerable attention as energy solution towards a green future. Previous works have shown that adding 30VOL.% hydrogen with ammonia can eradicate the drawbacks of pure ammonia combustion but no study in the literature has investigated this blend across a wide range of equivalence ratios. The present work investigates 70/30VOL.% NH3/H2 blend from 0.55 ≤ Φ ≤ 1.4 for both premixed laminar spherically expanding flames and turbulent swirling flames at atmospheric conditions. A detailed chemistry analysis has been conducted in Ansys CHEMKIN-PRO platform using a chemical reactor network (CRN) model to simulate the swirling turbulent flames. NO and NO2 emissions have followed similar bell-shaped trends, peaking at around Φ = 0.8, while N2O emission rises at lean conditions (Φ ≤ 0.7). The results indicate that Φ = 1.2 is the optimum equivalence ratio with reduced NOX emissions and some ammonia slip.

Mots clés: ammonia; hydrogen; flame speed; NOX; chemiluminescence

Domaines: Milieux fluides et réactifs

S. Mashruk, S.E. Zitouni, Pierre Brequigny, C. Mounaim-Rousselle, A. Valera-Medina. Combustion performances of premixed ammonia/hydrogen/air laminar and swirling flames for a wide range of equivalence ratios. International Journal of Hydrogen Energy, 2022, ⟨10.1016/j.ijhydene.2022.09.165⟩. ⟨hal-03799834⟩