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在福建某电厂50MW的热电联产机组的锅炉定期检验中,对锅炉主汽阀进出口对接接头进行表面无损检测,发现两道对接环焊缝各有1条危害性裂纹。笔者通过分析锅炉主汽阀焊缝裂纹原因,从主汽阀的设计布置、主汽阀的安装焊接和日常运行管理等方面提出相关处理措施。
During the boiler regular inspection of a 50 MW CHP unit in a power plant in Fujian, the non-destructive testing of the inlet and outlet butt joints of the main steam valve of the boiler was carried out. One harmful crack was found in each of the two butted girth welds. The author analyzes the main steam valve cracks in the boiler, the main steam valve from the design and layout, the main steam valve installation and daily operation and management aspects of the proposed treatment measures.