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<p>To address the low utilization efficiency of ultra-low concentration methane, this study proposes a low-carbon co-combustion method using coal gangue in a fluidized bed. Through a combination of experimental investigation and chemical kinetic modeling, the combustion characteristics and underlying mechanisms were thoroughly analyzed. The results indicate that the optimal co-combustion ratio (CR) of ultra-low concentration methane to coal gangue is 0.3. Under these conditions, with an initial temperature of 740°C, the methane conversion efficiency reached 99.5%. Furthermore, compared to pure coal gangue combustion, the unburned carbon content in fly ash decreased by 60.7%, and average NO<sub><i>x</i></sub> emissions dropped from 88.2×10<sup>−6</sup> to 74.9×10<sup>−6</sup> Chemical kinetic simulations reveal that, compared to single-component combustion, co-combustion significantly enhances the concentrations of key radicals such as H, OH, and O. This enhancement promotes chain reaction initiation and alters the dominant elementary reactions governing temperature evolution. Consequently, the reaction pathways and NO<sub><i>x</i></sub> formation mechanisms shift from simple chain reactions to more complex processes involving multiple radical species. These findings provide critical guidance for developing technologies to efficiently utilize ultra-low concentration methane.</p>

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Low-Carbon Co-Combustion of Ultra-Low Concentration Methane with Coal Gangue: Method Development and Mechanistic Analysis

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Ziwei Hu,
  • Qingxiang Wang,
  • Ran Xu,
  • Xin Xu,
  • Ding Wang,
  • Xiao Yang,
  • Yaojie Tu

摘要

To address the low utilization efficiency of ultra-low concentration methane, this study proposes a low-carbon co-combustion method using coal gangue in a fluidized bed. Through a combination of experimental investigation and chemical kinetic modeling, the combustion characteristics and underlying mechanisms were thoroughly analyzed. The results indicate that the optimal co-combustion ratio (CR) of ultra-low concentration methane to coal gangue is 0.3. Under these conditions, with an initial temperature of 740°C, the methane conversion efficiency reached 99.5%. Furthermore, compared to pure coal gangue combustion, the unburned carbon content in fly ash decreased by 60.7%, and average NOx emissions dropped from 88.2×10−6 to 74.9×10−6 Chemical kinetic simulations reveal that, compared to single-component combustion, co-combustion significantly enhances the concentrations of key radicals such as H, OH, and O. This enhancement promotes chain reaction initiation and alters the dominant elementary reactions governing temperature evolution. Consequently, the reaction pathways and NOx formation mechanisms shift from simple chain reactions to more complex processes involving multiple radical species. These findings provide critical guidance for developing technologies to efficiently utilize ultra-low concentration methane.