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<p>As a new zero-carbon fuel, ammonia co-firing in coal-fired boilers is one of the feasible technologies for reducing carbon emission. This study validated an ammonia-coal co-firing simulation model using experimental data from a 300&#xa0;MW unit tangential firing boiler, and investigated the impacts of different ammonia injection methods (uniform injection, lower layer concentrated injection and upper layer concentrated injection) at 20% ammonia co-firing ratio on boiler performance. Key findings include flow fields characteristics: uniform injection enhanced the tangential flow pattern, while pure ammonia burners in concentrated injection modes exhibited weaker tangential momentum compared to coal burners; combustion and temperature fields: all the three injection methods reduced peak furnace temperatures but increased flue gas temperature at furnace outlet; coal burnout performance: uniform injection and lower layer concentrated injection inhibited coal burnout, whereas upper layer concentrated injection promoted it; NO<sub>x</sub> emissions: both uniform injection and lower layer injection reduced NO<sub>x</sub> emissions, while upper layer injection significantly increased them. These conclusions provide critical guidance for retrofitting power plant boilers for ammonia co-firing.</p>

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Simulation study on coal and ammonia co-firing in a tangential firing boiler under different ammonia injection methods

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月6日

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  • Wangping Sun,
  • Qifu Lin,
  • Haiyan Li,
  • Shidong Fang,
  • Yuwei Chen,
  • Yu Cheng,
  • Huaqing Ya,
  • Hansheng Feng

摘要

As a new zero-carbon fuel, ammonia co-firing in coal-fired boilers is one of the feasible technologies for reducing carbon emission. This study validated an ammonia-coal co-firing simulation model using experimental data from a 300 MW unit tangential firing boiler, and investigated the impacts of different ammonia injection methods (uniform injection, lower layer concentrated injection and upper layer concentrated injection) at 20% ammonia co-firing ratio on boiler performance. Key findings include flow fields characteristics: uniform injection enhanced the tangential flow pattern, while pure ammonia burners in concentrated injection modes exhibited weaker tangential momentum compared to coal burners; combustion and temperature fields: all the three injection methods reduced peak furnace temperatures but increased flue gas temperature at furnace outlet; coal burnout performance: uniform injection and lower layer concentrated injection inhibited coal burnout, whereas upper layer concentrated injection promoted it; NOx emissions: both uniform injection and lower layer injection reduced NOx emissions, while upper layer injection significantly increased them. These conclusions provide critical guidance for retrofitting power plant boilers for ammonia co-firing.