低氮燃烧器改造及运行调整方法探讨.docx

低氮燃烧器改造及运行调整方法探讨 禹庆明1 ，张波1 ，朱宪然2 ，王巨川1( 1． 大唐国际发电股份有限公司张家口发电厂，河北张家口 075133;2． 华北电力科学研究院有限责任公司，北京 100045)摘 要: 介绍了 NOx 生成机理及双尺度低 NOx 燃烧技术，指出低 NOx 燃烧器改造后运行的核心是控制炉内局部区域的空燃比和炉内燃烧的最高温度。介绍了 1 台 300 MW 机组锅炉进行双尺度低 NOx 燃烧器改造的 方案，改造后 NOx 的排放值能大幅降低。探讨了低 NOx 燃烧器改造后锅炉的优化控制以及对锅炉经济性的 影响。运行氧量降低能够有效降低 NOx 的生成，然而却会导致飞灰含碳量的增加。同样地，加大燃尽风量也 能减少 NOx，但飞灰含碳量也会相应增加。在不同的煤质、机组负荷、磨煤机组合的情况下，NOx 的排放也会 有所区别。本文可为国内燃煤锅炉低 NOx 燃烧器的改造及优化运行提供借鉴。关键词: 煤粉锅炉; 低氮燃烧器; 燃烧优化中图分类号: TM621. 2文献标识码: B文章编号: 1003-9171( 2012) 07-0035-04Study of Low NOx Burner Retrofit and Operation AdjustmentYu Qing-ming1 ，Zhang Bo1 ，Zhu Xian-ran2 ，Wang Ju-chuan1( 1． Datang International Zhangjiakou Power Plant，Zhangjiakou 075133，China;2． North China Electric Power Research Institute Co． ，Ltd． ，Beijing 100045，China)Abstract: This paper introduces the formation mechanism of NOx and the low NOx technology with the double-scale．It shows that the core of operation is controlling the ratio of air to coal and the highest temperature in the furnace for the low NOx burner． The low NOx burners with the double-scale are adopted for the 300 MW unit in a power plant and the reconstruction scheme is introduced in detail． The optimized controlling mode is studied for the boiler with the low NOx burners and the impact of the mode on the economy is analyzed． The NOx will decrease while the un- burned carbon in the flue gas will increase when increasing the air during the combusting process． Similarly，the NOx will also decrease while the unburned carbon in the flue dust increases when increasing the proportion of the overfire air． The emission of NOx could be influenced by the various combination of coals，unit loads and the pulverizers． The present study could be reference for the domestic power plants in the retrofit and optimized operation of Low NOx burner．Key words: coal-fired boiler; low NOx burner; combustion optimization之一［5］。然而，由于 NOx 的产生与燃烧控制有着密切的关系，因此即使采用了低 NOx 燃烧器仍然 需要在锅炉运行中进行 优 化 调 整。在 这 个 层 面 上，目前国内仍需要继续摸索和积累经验。本文首先介绍了张家口发电厂 1 台 300