TY - JOUR
T1 - Interactions of hydrogen and nitric oxide in outwardly propagating spherical flame
T2 - Insight into non-hydrocarbon NOX reduction mechanism
AU - Zou, Jiabiao
AU - Zhang, Jianguo
AU - Lian, Tianyou
AU - Mei, Bowen
AU - Li, Yuyang
N1 - Funding Information:
The research was supported by National Key R&D Program of China (2017YFE0123100) and National Natural Science Foundation of China ( 91841301, U1832171 ).
Publisher Copyright:
© 2022 The Combustion Institute
PY - 2023/1
Y1 - 2023/1
N2 - Co-firing ammonia (NH3) and hydrogen (H2) or H2-rich fuel and partially cracking NH3 are promising non-carbon combustion techniques for gas turbines and marine engines, raising a growing need to understand the interactions of H2 and nitric oxide (NO) as well as the non-hydrocarbon nitrogen oxides (NOX) reduction mechanism under flame conditions. In this work, the outwardly propagating spherical flame method was used to investigate the laminar flame propagation of H2/NO and H2/NO/nitrogen (N2) mixtures at initial pressure (Pu) of 2 atm, initial temperature (Tu) of 298 K and equivalence ratios of 0.2-1.4. The laminar burning velocities (LBVs) of H2/NO mixtures are generally 5-10 times lower than those of H2/air mixtures, while the dilution of N2 can dramatically inhibit the laminar flame propagation. A kinetic model of H2/NO combustion was constructed and validated against the new data in this work and other types of experimental data in literature. The modeling analyses reveal that NO+H=N+OH becomes the most important chain-branching reaction in H2/NO reaction system, while the LBV data of H2/NO mixtures in this work can provide highly sensitive validation targets for the kinetics in H2 and NO interactions. Furthermore, the NO reduction to N2 mainly proceeds through NO+N=N2+O under various H2/NO ratios, and NO+O=N+O2 is found to have a significant contribution to NO reduction under NO-rich conditions.
AB - Co-firing ammonia (NH3) and hydrogen (H2) or H2-rich fuel and partially cracking NH3 are promising non-carbon combustion techniques for gas turbines and marine engines, raising a growing need to understand the interactions of H2 and nitric oxide (NO) as well as the non-hydrocarbon nitrogen oxides (NOX) reduction mechanism under flame conditions. In this work, the outwardly propagating spherical flame method was used to investigate the laminar flame propagation of H2/NO and H2/NO/nitrogen (N2) mixtures at initial pressure (Pu) of 2 atm, initial temperature (Tu) of 298 K and equivalence ratios of 0.2-1.4. The laminar burning velocities (LBVs) of H2/NO mixtures are generally 5-10 times lower than those of H2/air mixtures, while the dilution of N2 can dramatically inhibit the laminar flame propagation. A kinetic model of H2/NO combustion was constructed and validated against the new data in this work and other types of experimental data in literature. The modeling analyses reveal that NO+H=N+OH becomes the most important chain-branching reaction in H2/NO reaction system, while the LBV data of H2/NO mixtures in this work can provide highly sensitive validation targets for the kinetics in H2 and NO interactions. Furthermore, the NO reduction to N2 mainly proceeds through NO+N=N2+O under various H2/NO ratios, and NO+O=N+O2 is found to have a significant contribution to NO reduction under NO-rich conditions.
KW - Hydrogen
KW - Kinetic model
KW - Laminar burning velocity
KW - Nitric oxide
KW - Non-hydrocarbon NO reduction
UR - http://www.scopus.com/inward/record.url?scp=85138704243&partnerID=8YFLogxK
U2 - 10.1016/j.proci.2022.07.215
DO - 10.1016/j.proci.2022.07.215
M3 - Article
AN - SCOPUS:85138704243
SN - 1540-7489
VL - 39
SP - 4299
EP - 4307
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 4
ER -
