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山东十里泉发电厂4号机组系我厂125MW汽轮机第50台产品,在1991年11月大修时发现第九级隔板汽叶损坏,原因为该机组在运行过程中因流通部分有异物脱落,将第九级隔板汽叶严重打坏,使隔板汽叶出汽边打裂22处,并且将汽叶背弧面节圆线外打成许多密集状麻点,麻点直径最大的约φ3～φ0.5mm,部分汽叶型面产生严重凹坑(见图所示),直接影响了机组的安全性和经济性。按技术要求该隔板已无法使用,应予以报废;但考虑到电厂大修周期及社会经济效益,经反复研究,决定采用补焊结合打磨的方法修复,即将汽叶节圆线以外型面(背弧)
Unit 4 of Shandong Shiliquan Power Plant is the 50th product of 125MW steam turbine of our factory. When the overhaul was overhauled in November 1991, it was found that the vane of the ninth level diaphragm was damaged due to the shedding of foreign matter due to the circulation in the operation of the unit, The ninth grade separator vane severely damaged so that the separator leaves out of the steam side of the crack 22, and the vortex back arc surface outside the polygon-shaped pitch point punctate, pitting the largest diameter of about φ3 ~ φ0.5mm, some vane profiles produce serious pit (see picture), which has a direct impact on the safety and economy of the unit. According to the technical requirements of the partition has been unable to use, should be scrapped; but taking into account the power plant overhaul cycle and socio-economic benefits, after repeated studies, decided to use welding repair combined with grinding method, that is, arc)