2150t/h切圆燃烧锅炉旋流指数的试验研究  

Experimental Study on Swirl Number of a 2150t/h Tangentially Fired Boiler

作　　者：靳允立[1] 

机构地区：[1]西门子电站自动化有限公司,南京211100

出　　处：《动力工程学报》2013年第10期745-752,共8页Journal of Chinese Society of Power Engineering

摘　　要：为减小切圆燃烧锅炉的汽温偏差,以2150t/h四角切圆燃烧锅炉为试验对象,研究了炉膛火焰中心与旋流指数的关联以及燃烧调整对旋流指数的影响.在试验分析的基础上,结合汽温偏差变化,得到了炉膛火焰中心随旋流指数的变化轨迹.从风箱炉膛压差控制的角度进行了计算,并分析了加大配风不均衡性对旋流指数的影响.结果表明:加大配风不均衡性会导致旋流指数增大;旋流指数与负荷不存在确定的对应关系;降低氧体积分数过程中旋流指数减小,降低氧体积分数后降负荷过程中旋流指数的变化幅度增大,易引起汽温偏差增大和超温现象;燃烧器下摆会增大旋流指数;反切分离燃尽风(SOFA)过大时,反向旋流指数的增大同样会引起两侧汽温偏差增大.To reduce the steam temperature deviation of a 2 150 t/h tangentially fired boiler, experimental studies were performed on the correlation between the swirl number and the flame center track, while an analysis carried out to the influence of combustion adjustment on the swirl number. Based on experimental analysis and combined with steam temperature deviation, the running track of flame center varying with the swirl number was obtained. By calculation from perspective of wind box differential pressure control, laws governing the variation of air distribution unevenness on the swirl number were studied. Results show that raising the unevenness of air distribution will lead to increased swirl number; there does not exist a definite correspondence between the swirl number and the load; the swirl number reduces with decreasing oxygen volume fraction, and the fluctuation range of swirl number was enlarged during unloading process, which may lead to large steam temperature deviation and overheating failures; the downswing of burner helps to raise the swirl number; the increase of reverse swirl number caused by too large air flow of reversed tangential separated overfire air （SOFA） can also enlarge the steam temperature deviation.

关 键 词：切圆燃烧锅炉 汽温偏差 炉膛火焰中心 旋流指数 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]