三次风炉外分离技术在低氮燃烧改造中的研究与应用  

Research on and Application of Tertiary Air External Separation Technology in Low Nitrogen Combustion Retrofit

作　　者：杜君文 申明 李升 DU Junwen;SHEN Ming;LI Sheng(Chang＇an Shimen Power Generation Co.,Ltd.,Changde 415300,China)

机构地区：[1]长安石门发电有限公司,湖南常德415300

出　　处：《中国电力》2018年第12期114-117,共4页Electric Power

基　　金：国家重点研发计划基金资助项目(2017YFB0602004)~~

摘　　要：针对某电厂330 MW四角切圆中间储仓式热风送粉锅炉NO_x生成浓度高的问题,分析了三次风对NO_x生成的影响,优化了燃烧系统关键部件,整体上采用一次风水平浓淡低氮燃烧器+三次风炉外分离+空气分级技术的改造方案,针对NO_x生成影响较大的三次风采用了炉外分离+垂直空间分级送入技术。实际运行表明,改造后锅炉NO_x生成量明显减少,锅炉燃烧、运行稳定,锅炉效率不降低。Regarding the problem of high NOx concentrations in a 330 MW boiler with quadrangular circular firing and hot air coal-powder feeding, based on the analysis of the impacts of tertiary air on NOx generation, the key components of the combustion systemare optimized. To be more specific, the low level nitrogen burner with horizontal primary air separation, plus the tertiary air withexternal separation together with the in-depth air classification technologies are implemented in the entire retrofit scheme. Especiallyfor the tertiary air that may highly affect the NOx generation, the external separation and vertical space classification and deliverytechnologies are used. It is evident from the actual operation that after the retrofit, the NOx generation volume is reducedsignificantly, while the boiler combustion and operation still remain stable state without any side effect on the boiler efficiency.

关 键 词：火电厂 锅炉 炉外分离 浓淡分离 垂直空间分级 热风送粉 高温腐蚀 

分 类 号：TM621.2[电气工程—电力系统及自动化] TK223.2[动力工程及工程热物理—动力机械及工程]