Nitrogen sources and formation routes of nitric oxide from pure ammonia combustion

Xiangtao Liu, Jicang Si, Guochang Wang, Mengwei Wu and Jianchun Mi

Energy, 2025, vol. 315, issue C

Abstract: This study is to investigate firstly the nitrogen sources and formation routes of nitric oxide (NO) from pure ammonia combustion. A well stirred reactor (WSR) is used for chemical processes while a jet-in-hot-coflow (JHC) configuration of ammonia flames is employed to account for the flow impact. Different combustion regimes are simulated by changing various parameters in both WSR and JHC cases. Results reveal that the production of thermal-NO increases with TWSR (WSR working temperature) at TWSR ≥ 1900–2500 K, below which it is negligible. In contrast, the fuel-NO exhibits a non-monotonic behavior with TWSR: initially increasing, then decreasing, and eventually increasing again. Interestingly, it is found that reactions within the Extended Zeldovich route play a crucial role in reducing the fuel-NO. The simulated JHC flames of pure ammonia indicate that MILD combustion minimizes both fuel- and thermal-NO emissions. Furthermore, the fuel-NO always emerges as the dominant source of NO, no matter which combustion regime occurs. The thermal-NO however remains negligible in pure ammonia combustion except in those cases of enriched-oxygen and extremely-high ambient temperatures.

Keywords: Ammonia combustion; MILD combustion; NO formation; Thermal-NO; Fuel-NO (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:315:y:2025:i:c:s0360544225000970

DOI: 10.1016/j.energy.2025.134455

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