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【目的】为解决某600 MW大型煤粉锅炉在高负荷下主/再热汽温偏低以及低负荷时NOx排放超标的问题。【方法】本文提出一种涵盖分级输粉技术、燃烧器浓淡分离部件改造、燃尽风速优化及增设补燃风的综合性改造方案，并基于Fluent构建三维数值模型，通过多工况模拟验证方案在满负荷汽温提升、低负荷稳燃及NOx控制方面的综合效能。【结果】研究表明，综合改造后，主/再热汽温提升10～15℃，满负荷可稳定维持在540±10℃；通过分级输粉技术，在A层一次风管增设分叉结构形成可切换双管道系统，动态调节火焰中心高度，增强低负荷稳燃能力；燃烧器采用异形弯头与挡块组合，将煤粉浓淡比提升至2∶1,NOx排放降至200±20 mg/m3，降幅达30%；燃尽风喷口经封堵优化，风速提高至71 m/s，屏下烟温提升26～33℃，CO浓度降低40%～50%；增设12个补燃风喷口后，炉膛上部氧浓度提升，火焰中心上移，左右侧烟温偏差降低38%。调峰运行时，NOx排放显著改善，NOx浓度降至154 mg/m3，稳燃能力延伸至260 MW，前屏入口CO浓度控制在0.5%～0.9%。【结论】本文所述方案通过风量分配-燃烧优化-排放控制协同优化，在不进行受热面改造的前提下，显著提升了机组调峰灵活性与环保性能，为燃煤锅炉高效低碳运行提供了技术支撑。
Abstract：[Objective]To address the issues of low main/reheat steam temperatures at high load and excessive NOx emissions at low load in a 600 MW pulverized coal boiler,a comprehensive retrofit solution is proposed.[Methods]The solution includes staged coal feeding,burner modifications,combustion air optimization,and additional reburn air.A 3D numerical model was developed using Fluent,and simulations were conducted to evaluate the effectiveness in improving steam temperature,combustion stability,and pollutant control.[Results]After retrofit,steam temperatures increased by 10-15℃，stabilizing at 540±10°C under full load.The NOx emission was reduced by 30%to 200±20 mg/m3，and CO concentration decreased by 40%-50%.Additionally,NOx concentration dropped to 154 mg/m~3during loadfollowing,and combustion stability extended to 260 MW.[Conclusion]The proposed solution improves load-following flexibility and environmental performance without modifying heating surfaces,providing technical support for efficient,low-carbon operation of coal-fired boilers.
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基本信息:
DOI：10.19944/j.eptep.1674-8069.2026.03.005
中图分类号:X773;TM621.2
引用信息:
[1]严谨,吴旭洋,徐艺铭,等.600 MW燃煤锅炉汽温提升与NO_x协同控制数值模拟研究[J].电力科技与环保,2026,42(03):390-403.DOI:10.19944/j.eptep.1674-8069.2026.03.005.
基金信息:
江苏省自然科学基金青年基金项目（BK20230700）; 江苏省高等学校自然科学研究面上项目（22KJB470012）; 南京工程学院青年基金项目（QKJ202201）; 国家级大学生创新创业训练计划项目（202411276027Z）
2026-06-15
2026-06-15