优化配风对NO_x生成的影响  

Influence of Optimizing OFA on NO_x Formation by Numerical Simulation

作　　者：徐璁 王智化[1] 许岩韦[1] 黄镇宇[1] 刘建忠[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《燃烧科学与技术》2016年第3期241-246,共6页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB214906)

摘　　要：对一台1,000,MW超超临界锅炉中燃尽风(OFA)对NO_x生成的影响进行了数值模拟,分析了燃尽风配风比例以及燃尽风的SOFA喷口风门位置对出口NO_x的影响.结果表明:随着燃尽风配风比例的提高,由于主燃区过量空气系数减小导致还原性增强以及燃烬风补入空气对整体烟气的温度稀释和NO_x体积分数稀释的增强,使得出口NO_x体积分数降低.而上移SOFA喷口风门位置,由于拉长了还原区的长度导致出口NO_x降低.The influence of OFA（over-fired air）on NOx formation in a 1,000,MW ultra-supercritical boiler was simu-lated.The effects of the percentage of OFA and the postion of SOFA nozzles were analyzed.The analysis results indi-cated that with the increase in the percentage of OFA,the reducing atmosphere was strengthened by the reduced ex-cess air ratio in the primary combustion zone,and the temperature and concentration were diluted by OFA air,thus reducing the outlet NOx concentration. Shifting the SOFA nozzles increased the length of reduction zone,hence de-creasing the NOx concentration.

关 键 词：超超临界锅炉 NOx 燃尽风 配风比例 平移SOFA喷口 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]