墙式分离燃尽风对660MW切圆燃烧锅炉烟温偏差影响的数值模拟研究  

Numerical Study of Effect of Wall Separated Over-fire Air on Flue Gas Temperature Deviation in 660MW Tangentially Coal-fired Boiler

作　　者：陈前明 方庆艳[2] 张成[2] 陈刚[2] 

机构地区：[1]广东省粤电集团有限公司沙角C电厂,广东东莞523936 [2]煤燃烧国家重点实验室(华中科技大学),湖北武汉430074

出　　处：《广东电力》2016年第7期16-23,共8页Guangdong Electric Power

基　　金：国家自然科学基金资助项目(51006042);广东省省部产学研结合项目(2013B090500008)

摘　　要：为研究墙式分离燃尽风(separated over-fire air,SOFA)对切圆燃烧锅炉烟温偏差的影响效果,对1台660MW四角切圆燃烧锅炉开展了多工况炉内流动、燃烧和污染物排放数值模拟,研究了墙式SOFA风率和摆角对锅炉烟温偏差的影响。结果表明:SOFA风量增加,使得炉膛出口烟窗截面温度分布不均匀系数和炉膛出口截面烟温偏差减小,并且有利于降低NO_x排放量,但对煤粉燃尽率影响不大;SOFA喷口水平摆角增大,有利于降低锅炉烟温偏差;SOFA喷口向下摆动,有利于降低锅炉烟温偏差。To study the effect of wall separated over-fire air（SOFA）on flue gas temperature deviation,numerical simulation on furnace flow,combustion and pollutant emission under multiple loading conditions for a 660 MW tangentially coal-fired boiler was carried out.The effect of SOFA air rate and swinging angle onthe flue gas temperature deviation was investigated carefully.The simulation results indicate that increase of air rate of SOFA causes sectional temperature unevenness coefficient of smokestack at the furnace exit and sectional flue gas temperature deviation at the furnace exit both decrease and makes for reducing NOx emission without large impact on burn-off rate of pulverized coal.Meanwhile,level swinging angle of SOFA nozzle extends and SOFA nozzle swings downward,which are both good to reduce flue gas temperature deviation of the boiler.

关 键 词：锅炉 分离燃尽风 摆角方式 风量配比 烟温偏差 数值模拟 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]