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The present study addresses the challenge of controlling NOx emissions in industrial kilns through hydrogen-enriched methane combustion. A new reduced mechanism, ZG81, was developed and validated for NOx prediction, comprising 81 reactions and 28 species by extending the Z45 mechanism with key NOx formation pathways. Parametric simulations were performed in a cylindrical burner with staged air inlets, exploring the effects of 50% and 100% hydrogen substitution, variations in excess air ratio \(\lambda \) , and air distribution between primary and secondary inlets. The results demonstrate that air staging significantly influences flame structure and NO formation. In particular, adjusting the distribution of air effectively regulates the jet flame structure and reduces peak NO levels in pure hydrogen flame, supporting the development of low-NOx burner strategies for hydrogen-enriched combustion in industrial applications.

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Numerical Investigation of Hydrogen Addition on Flame and NOx Emissions in Methane Combustion for Industrial Kilns Using a New Reduced Mechanism

  • 会议论文

  • 发表日期：

    2026年

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  • Jiannan Liu,
  • Eugenio Schillaci,
  • Jesus Ruano,
  • Joaquim Rigola,
  • Carlos D. Pérez-Segarra

摘要

The present study addresses the challenge of controlling NOx emissions in industrial kilns through hydrogen-enriched methane combustion. A new reduced mechanism, ZG81, was developed and validated for NOx prediction, comprising 81 reactions and 28 species by extending the Z45 mechanism with key NOx formation pathways. Parametric simulations were performed in a cylindrical burner with staged air inlets, exploring the effects of 50% and 100% hydrogen substitution, variations in excess air ratio \(\lambda \) , and air distribution between primary and secondary inlets. The results demonstrate that air staging significantly influences flame structure and NO formation. In particular, adjusting the distribution of air effectively regulates the jet flame structure and reduces peak NO levels in pure hydrogen flame, supporting the development of low-NOx burner strategies for hydrogen-enriched combustion in industrial applications.