Ammonia (NH3) is a promising carbon-neutral fuel. To clarify the NOx emission of ammonia rich-quick mix-lean (RQL) combustion with multiple parameters and overcome the single-parameter limitations of conclusions

this study establishes a five-dimensional parameter matrix (primary equivalence ratio

hydrogen blending ratio

inlet temperature

residence time

and pressure)

including 11 760 cases. Reactor network simulations are conducted to investigate ammonia RQL combustion. The results indicate that

reducing the sum of NH3 and NOx in primary combustion products is critical for lowering overall NOx emissions. The primary residence time simultaneously increases or decreases NH3-NOx levels in primary products

enabling independent optimization. Primary equivalence ratio

hydrogen blending ratio

and inlet temperature induce opposing changes (one increases while the other decreases) in NH3-NOx levels

necessitating coordinated adjustments. Pressure exhibits non-monotonic variations. This study demonstrates that staged combustion emissions is controlled by primary NH3 and NOx

and simplifies parameter optimization principles through parameter classification. The findings provide insights into ammonia staged combustion mechanisms and can guide combustion optimization strategies.