某350MW亚临界汽轮机调节级喷嘴叶根裂纹分析与对策  

Crack Analysis and Preventive Measures of Nozzle of Governing Stage of 350MW Sub-critical Steam Turbine

作　　者：郦琦[1] 王广坤[1] 

机构地区：[1]宝山钢铁股份有限公司电厂,上海200941

出　　处：《矿业工程》2014年第5期67-69,共3页Mining Engineering

摘　　要：针对进口350MW汽轮机调节级喷嘴叶根产生裂纹的原因进行深入分析,指出其主要原因是更换调节级喷嘴和冲刷严重的第一级动叶后,对其余转子动叶进行喷砂清洗时,固体颗粒嵌入叶根与叶根槽间,局部部位产生应力集中现象,在汽流冲击和高频振动作用下产生裂纹,并从运行和检修维护方面提出防范措施。This paper makes an in-depth analysis of causes for cracks in nozzles of governing stage of 350 MW subcritical steam turbines,points out the major cause,which is that after replacing nozzle and washed-out movable vane,stress collection arises from the solid particle exist in root and root groove during sand blasting of other vanes and cracks are brought about under vapor steam impingement and high-frequency vibration,and puts forward preventive measures in terms of operation and maintenance.

关 键 词：汽轮机 调节级 喷嘴 裂纹 

分 类 号：TK26[动力工程及工程热物理—动力机械及工程]