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1缺隐检验基本情况我省某电厂1025t/h电站锅炉,运行时间2.6×10~4h,2009年9月进行首次定期内部检验。该炉在屏式再热器出口集箱至高温再热器入口集箱之间的连接管道上安装有微量喷水减温器,减温器筒体规格(?)558.8mm×25mm,材料12Cr1MoVG,工作压力3.61MPa,工作温度484℃。在对微量喷水减温器检验时,发现A侧减温器减温水管座与减温器筒体连接的下部角焊缝部位保温层掉落,筒体外壁有汽水冲刷痕迹。仔细检查并经磁粉探伤进一步检查后发现该部位有一长约35mm的穿透型裂纹(见图1),裂纹长度横向贯穿角焊缝并延伸至筒体母材。从减温器套管座与管座的连接焊缝处割开,取出减温水管和喷嘴连接组件进行检查发现,与减温水管相连的喷嘴已断裂,断口位于喷嘴三通装配件上(减
A lack of hidden test basic situation A power plant in our province 1025t / h power plant boilers, running time 2.6 × 10 ~ 4h, September 2009 for the first time a regular internal inspection. The furnace is equipped with a micro spray desuperheater on the connecting pipe between the outlet of the screen reheater and the inlet header of the high-temperature reheater, the specification of the desuperheater cylinder (?) 558.8mm x 25mm, the material 12Cr1MoVG , Working pressure 3.61MPa, working temperature 484 ℃. In the test of micro spray desuperheater, found that the A side desuperheater water pipe seat and desuperheater connected to the lower part of the fillet weld insulation layer drops, the outer wall of the cylinder has scour marks. After careful examination and further examination by magnetic particle inspection found that the site has a penetration of about 35mm crack (see Figure 1), the crack length across the fillet weld and extends to the cylinder base metal. From the desuperheater casing and the base of the weld connection at the cut open, remove the water pipes and nozzle nozzle assembly inspection found that the nozzle connected to the water pipe has been broken, the fracture is located in the nozzle fittings (minus