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一、加环形补气管前后的运行及检修情况我厂装置HL211-LJ-225型水轮机四台,1957年11月开始陆续投入运行。运行前期,转轮的汽蚀成为影响运行的主要原因之一。开始每2～3年必须进行一次大修(每年运行小时数平均3500～5000小时左右),不大修则运行性能恶化,汽蚀面积、深度急剧增加。2号机曾运行不到一年半就必须进行汽蚀处理。一般在大修间隔2～3年的情况下,每次汽蚀处理使用焊条达60～100公斤,耗费工时400～600小时,汽蚀处理费用约占大修费用的10～
First, before and after the addition of annular gas pipe operation and overhaul I plant HL211-LJ-225 turbine four units, 1957 November began operation. Pre-run, runner cavitation has become one of the main reasons for the impact of operation. Starting every 2 to 3 years must be a major overhaul (annual operating hours average of 3500 to 5000 hours), not overhaul performance deterioration, cavitation area, the depth of a sharp increase. Unit 2 had run cavitation for less than a year and a half. Generally in the overhaul interval of 2 to 3 years, the use of welding electrodes per cavitation up to 60 to 100 kg, working hours 400 to 600 hours, cavitation treatment costs account for overhaul costs of 10 ~