摘要
某 60 0MW四角切圆燃烧锅炉 ,采用偏转二次风系统 ,炉膛下部二次风大角度正切 ,上部二次风和OFA风反切消旋 ,因而在炉膛截面水平方向和炉膛高度方向形成分级燃烧。实际运行结果表明 ,该燃烧器布置方式能抑制炉内结渣 ,减轻炉膛出口扭转残余并能降低NOx排放量。本文通过对该 60 0MW锅炉进行冷热态多工况试验 ,摸索偏转二次风系统的炉内空气动力特性和热态运行特性 ,采用数值计算对该炉炉内流动、传热、燃烧和氮氧化物生成过程进行模拟 ,并将模拟结果与试验结果比照 ,为大型电厂锅炉采用偏转二次风系统的设计和运行提供参考。
A 600?MW utility boiler uses deflected second air system, the lower second air is deflected to the waterwall and the upper second air and the overfire air is deflected to the opposite direction of the flow rotation direction in the furnace, in order to obtain the effect of slagging-perevention and decreasing the twisting residual at the exit of furnace. In this paper, through experimental and numerical methods, the aerodynamics and NOx emission property in the 600?MW utility boiler is measured and calculated. The results illustrated that the numerical methods used in this paper is feasible and it can give reference to design and operation of high capacity utility boiler with deflected second air system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2000年第11期68-71,76,共5页
Proceedings of the CSEE
关键词
锅炉
二次风系统
氮氧化物
数值模拟
utility boiler
deflected second air
NOx emission
numerical simulation
