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<p>This study investigates the effect of residual ammonia on NO<sub><i>x</i></sub> 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&#xa0;ms, and equivalence ratios (<i>ϕ</i>) from 0.5 to 0.8. Residual NH<sub>3</sub> concentrations ranged from 10 to 10,000 ppm. Nine chemical kinetic mechanisms were compared. Results showed that low NH<sub>3</sub> concentrations led to pressure-driven NO<sub>x</sub> increase via the thermal–NO pathway, while high NH<sub>3</sub> suppressed NO<sub><i>x</i></sub> formation due to enhanced radical recombination. A crossover point (2000–5000&#xa0;ppm) was identified, marking the transition between dominant NO formation mechanisms. These findings inform strategies for NO<sub><i>x</i></sub> 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. </p>

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Evaluation of NOx Emission Characteristics with Respect to Residual Ammonia Concentration in Ammonia Cracked Fuel

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Jinhyeon Park,
  • Min Jung Lee

摘要

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.