1设备基本情况某电厂1000MW超超临界直流锅炉,采用∏型布置、反向双切园燃烧方式,一次中间再热、最大连续蒸发量2953t/h,过热器蒸汽出口温度为605℃,给水温度298℃。炉膛采用内螺纹管垂直水冷壁并有较高的质量流速,在水冷壁中间混合集箱和节流度较大的水冷壁管段装设节流孔圈(缩孔),对控制水冷壁的温度和流量偏差都非常有利。水处理方式为AVT(O)。2运行及检验发现的情况 A basic situation of a power plant 1000MW ultra-supercritical once-through boiler with Π-type layout, reverse dual cut Park combustion mode, a middle reheat, the maximum continuous evaporation 2953t / h, superheater steam outlet temperature of 605 ℃, feed water temperature 298 ° C. The inner wall of the furnace is provided with a vertical water wall and a high mass flow rate. A header (shrinkage cavity) is installed in the mixing header and the water-cooled wall section with larger throttling degree in the middle of the water wall, And the flow deviation is very favorable. Water treatment for the AVT (O). 2 Operation and inspection found