分析了华能营口电厂2台600 MW超超临界机组锅炉下水冷壁在不同负荷下的出口工质温度分布特性.结果表明:在500 MW以上负荷时,锅炉各墙下水冷壁出口工质温度分布呈现非对称的“M”形,且靠近上游燃烧器侧的区域温度最高.指出导致下水冷壁出口工质温度偏高的主要原因是水冷壁节流孔布置没有充分发挥其控制偏差的作用.根据2台锅炉的当前运行特性,提出了通过改变壁温测量方法、降低过热度和调整部分节流孔圈内径等措施来提高锅炉运行安全性的建议. The temperature distribution characteristics of outlet working fluid under two different load of two 600 MW supercritical units in Huaneng Yingkou Power Plant were analyzed.The results show that when the temperature is above 500 MW, Asymmetric “M ” shape, and the area near the upstream combustor has the highest temperature.It is pointed out that the main reason leading to the high temperature of the working fluid in the outlet wall is that the waterwall orifice arrangement does not fully exert its control deviation Based on the current operating characteristics of two boilers, some suggestions are put forward to improve boiler operation safety by changing the measurement methods of wall temperature, reducing the degree of superheat and adjusting the diameter of some orifice rings.