Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received May 8, 2025
Accepted July 5, 2025
Available online November 25, 2025
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
All issues
Evaluation of NOx Emission Characteristics with Respect to Residual Ammonia Concentration in Ammonia Cracked Fuel
https://doi.org/10.1007/s11814-025-00513-1
Abstract
This study investigates the effect of residual ammonia on NOx
formation in combustors using cracked ammonia fuel. Simulations
were conducted under gas turbine-relevant conditions, including pressures of 1–25 bar, residence times of 2–10 ms,
and equivalence ratios (ϕ) from 0.5 to 0.8. Residual NH3
concentrations ranged from 10 to 10,000 ppm. Nine chemical
kinetic mechanisms were compared. Results showed that low NH3
concentrations led to pressure-driven NOx
increase via
the thermal–NO pathway, while high NH3
suppressed NOx
formation due to enhanced radical recombination. A crossover
point (2000–5000 ppm) was identified, marking the transition between dominant NO formation mechanisms. These findings
inform strategies for NOx
mitigation in gas turbines using cracked ammonia. These findings offer a fundamental information
for optimizing residual ammonia control in gas turbines using ammonia cracked fuels.
