Sun Wangping, Lin Qifu, Li Haiyan, Fang Shidong, Chen Yuwei, Cheng Yu, Ya Huaqing, Feng Hansheng
Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory), Hefei, 230088, China.
Anbang Technology Co., Ltd, Tongling, 244000, China.
Sci Rep. 2025 May 6;15(1):15768. doi: 10.1038/s41598-025-98792-5.
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; NO emissions: both uniform injection and lower layer injection reduced NO emissions, while upper layer injection significantly increased them. These conclusions provide critical guidance for retrofitting power plant boilers for ammonia co-firing.
作为一种新型零碳燃料，在燃煤锅炉中掺烧氨是减少碳排放的可行技术之一。本研究利用一台300MW四角切圆燃烧锅炉的试验数据验证了氨煤混烧模拟模型，并研究了在20%氨掺烧比例下不同氨喷射方式（均匀喷射、下层集中喷射和上层集中喷射）对锅炉性能的影响。主要研究结果包括：流场特性方面，均匀喷射增强了切向流型，而集中喷射模式下的纯氨燃烧器与煤粉燃烧器相比切向动量较弱；燃烧和温度场方面，三种喷射方式均降低了炉膛温度峰值，但提高了炉膛出口烟气温度；煤粉燃尽性能方面，均匀喷射和下层集中喷射抑制了煤粉燃尽，而上层集中喷射则促进了煤粉燃尽；NO排放方面，均匀喷射和下层喷射均降低了NO排放，而上层喷射则显著增加了NO排放。这些结论为电厂锅炉氨掺烧改造提供了关键指导。
