汽轮机叶片断裂原因分析研究

Fracture analysis of steam turbine blade

针对锅炉软水处理存在的普遍性问题,对汽轮机垢进行了分析;对叶片进行了热力计算分析;对额定工况与堵塞工况的第5级叶片进行了强度核算;对某垃圾电站的汽轮发电机组转子叶片断裂原因进行了分析,认定了其原因在于结垢引起了局部通流面积锐减,转子叶片的受力发生了很大的变化,以导致叶片断裂。研究结果表明,通过采用加强对汽机运行参数监控的方式,可及时发现蒸汽品质的变化,提高锅炉软水处理的能力,能够实现机组长期、经济地运行。

Aiming at the common problem with the water treatment for boiler, turbine scaling itself was analyzed. The thermal calculation result of blade was checked, and the intension calculation on the 5th stage blade at normal condition and choked condition was reviewed. After the broken turbine blade for one garbage plant was analyzed in detail, it was found that the extra force on blade was caused by the flow path reduced that is from the scaling and the extra force cause the blade broken finally. The study results show that, the turbine- generator set could be run stablity with the follow improvement： optimization on the water treatment performance and attention on the steam quality change if any with continue checking on steam turbine operation data.