摘要
循环流化床(circulating fluidized bed,CFB)锅炉NO_(x)的生成和排放特性不仅与燃料性质有关,更与燃烧设备的性能和运行条件紧密关联。了解NO_(x)排放与各设计或运行参数间的变化关系,是工程上实现CFB锅炉低氮燃烧的关键所在。在给定的燃料和锅炉负荷下,提高分离器效率、改善循环系统性能、合理分级配风和氧量调节、调整给煤粒度和石灰石粒度、合适的床温床压选择、提高风煤混合均匀性等措施,可以有效降低NO_(x)的原始排放水平。该文从CFB燃烧NO_(x)生成机理出发,综述各因素对NO_(x)原始排放的影响规律,对各低氮燃烧优化措施的原理进行分析,最后对目前该领域的研究热点进行总结和展望。
The NO_(x)emission of the circulating fluidized bed(CFB)boiler is not only affected by the fuel properties,but also closely related to the combustor performance and operation conditions.It is important to study the relationship between NO_(x)emission and several design or operation parameters,which is also the key to realize the de-NO_(x)combustion in engineering for a CFB boiler.Under a specific boiler load and for a selected fuel type,several engineering methods were proved to have significant effects on the reduction of NO_(x)emission,such as improving the performance of circulating loop including improving cyclone efficiency,appropriately decreasing the size of feeding coal and limestone particles,adjusting the air staging and controlling the oxygen content in furnace,controlling the bed temperature and bed pressure drop in reasonable range,improving the uniformity of air and coal injection,etc.,This paper reviewed the NO_(x)formation and reduction mechanism under CFB combustion conditions,and summarized the effects of several design or operation parameters on the NO_(x)emission.The principles of some main de-NO_(x)combustion technologies were also analyzed.Finally,the key scientific issues and the future research directions related with NO_(x)emission of CFB combustion technology were discussed.
作者
柯希玮
张缦
杨海瑞
吕俊复
郭学茂
李军
贺辉宝
KE Xiwei;ZHANG Man;YANG Hairui;LYU Junfu;GUO Xuemao;LI Jun;HE Huibao(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education(Department of Energy and Power Engineering,Tsinghua University),Haidian Distinct,Beijing 100084,China;Taiyuan Boiler Group Co.Ltd.,Taiyuan 030000,Shanxi Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第8期2757-2770,共14页
Proceedings of the CSEE
基金
山西省科技重大专项资助项目(20181102001)。
关键词
循环流化床
NO_(x)
影响因素
低氮燃烧
研究进展
circulating fluidized bed
NO_(x)
influencing factors
low-NO_(x)combustion
research progress
