300MW机组低压转子次次末级叶片断裂故障原因分析及处理  

Fault analysis and treatment for the rupture on the third last-stage blading of 300MW HP rotors

作　　者：陈红冬[1] 魏继龙[1] 焦庆丰[1] 刘纯[1] 杨湘伟[1] 万克洋[1] 

机构地区：[1]湖南省电力公司试验研究院,湖南长沙410007

出　　处：《中国电力》2008年第5期15-18,共4页Electric Power

摘　　要：某电厂300MW火电机组在带满负荷运行中,汽轮机3、4号轴承振动突然增大,停机检查发现低压转子反向第4级(次次末级)有1片叶片断裂、2组围带飞脱。通过检查、试验和分析,发现叶片断裂的主要原因是该叶片材质局部不良,在现场更换该级2组共14片叶片后,机组至今运行正常。The vibration of No. 3 and 4 bearings increased suddenly in the full-load operation of 300 MW thermal power units in certain plant. One of the third last-stage blades on HP rotor was found ruptured and two shrouds falling-off. Based on the examination, test and analysis, main cause for the blade rupture is defective material at local areas. After the replacement of 14 blades in two group, the unit keeps in normal operation.

关 键 词：低压转子 叶片 断裂 

分 类 号：TK263.61[动力工程及工程热物理—动力机械及工程]