Numerical Predictions of a Swirl Combustor Using Complex Chemistry Fueled with Ammonia/Hydrogen Blends
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Conclusions
- The reaction model has a good prediction for the consumption/production of ammonia under atmospheric conditions. However, hydrogen reactivity is still not fully solved, with nitrogen oxides also being over-estimated.
- Nitrogen oxides remain at similar levels in most calculations, a consequence of a combined effect between the higher reactivity of the reactants at higher confinement temperatures and the increased reactivity of NO with unburned ammonia along the wall.
- Higher temperatures across the post-flame region (e.g., reduced heat losses through the boundary condition) show an increase in reactivity of ammonia for the formation of hydrogen. Ammonia, whose reactivity remains relatively the same at different conditions across the flame, also produces nitrogen oxides (probably as a result of the production of NHO and NH).
- On the other hand, hydrogen consumption through the flame is dependent on confinement temperatures, with an increase of the molecule caused by the decomposition of ammonia downstream the flame.
- Larger quantities of water and nitrogen are produced at higher temperatures through the complete reaction of intermediate molecules. Hydrogen and ammonia remain at the same concentrations at the exhaust. Therefore, the energy provided by the change in confinement temperature will have a direct impact on hydrogen through the flame and radical formation post-combustion.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Value | Parameter | Value |
---|---|---|---|
Quartz Temperature | 1450 K | Okafor Mechanism | 130 Reactions |
Inlet Velocity | 3 m/s | Method | Segregated Flow |
Inlet Temperature | 304 K | Ignition Temperature | 3000 K |
Pressure | 101,300 Pa | Turbulence | 10% |
Outlet Pressure | 99,274 Pa | Burner section | Symmetry (120°) |
Walls | No-slip | Swirler walls | Adiabatic |
Parameter | Value | Parameter | Value |
---|---|---|---|
Quartz Temperature | 1450, 1800, 2150 K | Okafor Mechanism | 130 Reactions |
Inlet Velocity | 20 m/s | Method | Segregated Flow |
Inlet Temperature | 500 K | Ignition Temperature | 3000 K |
Inlet Pressure | 0.90 MPa | Turbulence | 10% |
Outlet Pressure | 0.88 MPa | Burner section | Symmetry (120°) |
Walls | No-slip | Swirler walls | Adiabatic |
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Vigueras-Zuniga, M.-O.; Tejeda-del-Cueto, M.-E.; Vasquez-Santacruz, J.-A.; Herrera-May, A.-L.; Valera-Medina, A. Numerical Predictions of a Swirl Combustor Using Complex Chemistry Fueled with Ammonia/Hydrogen Blends. Energies 2020, 13, 288. https://doi.org/10.3390/en13020288
Vigueras-Zuniga M-O, Tejeda-del-Cueto M-E, Vasquez-Santacruz J-A, Herrera-May A-L, Valera-Medina A. Numerical Predictions of a Swirl Combustor Using Complex Chemistry Fueled with Ammonia/Hydrogen Blends. Energies. 2020; 13(2):288. https://doi.org/10.3390/en13020288
Chicago/Turabian StyleVigueras-Zuniga, Marco-Osvaldo, Maria-Elena Tejeda-del-Cueto, José-Alejandro Vasquez-Santacruz, Agustín-Leobardo Herrera-May, and Agustin Valera-Medina. 2020. "Numerical Predictions of a Swirl Combustor Using Complex Chemistry Fueled with Ammonia/Hydrogen Blends" Energies 13, no. 2: 288. https://doi.org/10.3390/en13020288