汽轮机高中压转子材质因素引起的弯曲故障  

Bending Fault Caused by Steam Turbine HP-IP Rotor Materials

作　　者：李恒海 安正锋 王宝玉 谷志德[3] 

机构地区：[1]华电电力科学研究院,浙江杭州310030 [2]大唐景泰发电有限公司,甘肃白银730408 [3]甘肃电力科学研究院,甘肃兰州730050

出　　处：《中国电力》2014年第8期94-97,共4页Electric Power

摘　　要：针对近几年频发的600 MW等级汽轮发电机组高中压转子在运行中逐渐弯曲的故障,结合2台超临界600 MW等级机组高中压转子的同类弯曲实例,通过弯曲特征分析了引起弯曲的原因和机理,得出转子材质缺陷是引起弯曲的关键因素,转子材料组织不均匀使转子受到高温蒸汽加热后产生弹性弯曲,转子残余内应力过大和分布轴不对称使转子受到高温蒸汽加热后发生应力松弛,产生永久性弯曲。总结了该类转子弯曲给机组安全、经济运行带来的一系列问题,并探讨了该类弯曲故障的处理方法及预防对策。Aiming at the HP-IP rotor bending faults which frequently happened in the operation of 600-MW turbine generating units in recent years, the reason and mechanism of the rotor bending are analyzed through the bending characteristics of the similar HP-IP rotor bending examples of two 600-MW supercritical units. It is concluded that the defect of HP-IP rotor materials is the key factor causing the bending. The uneven material makes the elastic bending happen in the high temperature steam and the stress relaxation caused by the excessive and asymmetrically axis distributed residual stress in high temperature steam heating leads to permanent bending. The secure and economic operation problems caused by rotor bending are summarized. The processing methods and prevention strategies are also included.

关 键 词：600MW汽轮机 高中压转子 材质缺陷 弯曲故障 

分 类 号：TK265[动力工程及工程热物理—动力机械及工程]