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A reduced kinetic mechanism for ammonia/biomass co-combustion and its utilization in a down-fired furnace and a fluidized bed reactor

Author

Listed:
  • Mei, Jiakun
  • Ma, Haotian
  • Li, Dongfang
  • Jeon, Chung-Hwan
  • Zhang, Man
  • Mun, Tae-Young
  • Wang, Hua
  • Li, Zhouhang
  • Tan, Fangguan
  • Duan, Yaozong
  • Yang, Hairui

Abstract

Ammonia co-firing is a promising approach for decarbonizing the energy sector, and reduced mechanisms can facilitate its numerical simulation. In this study, a reduced kinetic mechanism for ammonia/biomass co-combustion was developed and experimentally validated in both a down-fired furnace and a fluidized bed reactor. Five detailed mechanisms were evaluated against experimental data for laminar flame speed (LFS) and ignition delay time (IDT). The mechanism with 201 species and 2301 reactions was selected for reduction due to its strong predictive accuracy for LFS, IDT, and NO concentration. Using the direct relation graph with error propagation and sensitivity analysis, a reduced mechanism with 34 species and 201 reactions was developed. It achieved improved accuracy with errors of 8 % for LFS, 10 % for IDT, and 15 % for NO, outperforming the original mechanisms. Reaction rate and sensitivity analyses revealed consistently lower reaction rates in key pathways. Additional validation using CRN modeling and experiments in a fluidized bed reactor confirmed its robustness, with a 19 % error in NO prediction. This reduced mechanism maintains high predictive accuracy with significantly fewer reactions, providing a practical tool for advancing ammonia co-firing technologies.

Suggested Citation

  • Mei, Jiakun & Ma, Haotian & Li, Dongfang & Jeon, Chung-Hwan & Zhang, Man & Mun, Tae-Young & Wang, Hua & Li, Zhouhang & Tan, Fangguan & Duan, Yaozong & Yang, Hairui, 2026. "A reduced kinetic mechanism for ammonia/biomass co-combustion and its utilization in a down-fired furnace and a fluidized bed reactor," Renewable Energy, Elsevier, vol. 257(C).
    • Handle: RePEc:eee:renene:v:257:y:2026:i:c:s0960148125024231
    DOI: 10.1016/j.renene.2025.124759
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    References listed on IDEAS

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