二次再热超超临界汽轮发电机组轴系轴承标高分布及载荷特性研究  

Study on Bearing Elevation Distribution and Load Characteristics of Second Reheat ultra-supercritical Turbo-generator Set

作　　者：王文飚 薛建明 谭锐 何新荣 董月红 郭瑞[2] 

机构地区：[1]国电科学技术研究院有限公司清洁高效燃煤发电与污染控制国家重点实验室,江苏南京210046 [2]东南大学火电机组振动国家工程研究中心,江苏南京210096

出　　处：《工业控制计算机》2020年第11期89-91,共3页Industrial Control Computer

基　　金：“清洁高效燃煤发电与污染控制国家重点实验室开放课题基金资助项目”支持。

摘　　要：大型汽轮发电机组轴系中支撑轴承的标高分布状况会直接影响轴承的载荷分布及轴承油膜的温度、承载力等静、动力特性,乃至轴承宏观的瓦温及振动特性。尤其对于二次再热超超临界汽轮机发电机组,由于增加了超高压转子,轴系更为复杂,深入研究轴承载荷、标高分布特性对保障机组安全稳定运行具有重要意义。通过建立二次再热超超临界汽轮发电机组轴系有限元模型,在分析各转子自然挠曲变形特性的基础上,研究了轴系支撑轴承的载荷分布特性、支撑轴承标高调整方案的影响以及各轴承的标高变化灵敏度。结果表明:轴系中4/5/6瓦载荷较重,尤其5瓦载荷最重;2瓦负荷要远高于1瓦。轴系标高调整以低压II转子为基准较为合理,但也存在5/6瓦承载较重,7瓦相对较轻的情况;5瓦标高变化影响范围较广,而6瓦载荷灵敏度很大。Based on the analysis of the natural deflection and deformation characteristics of each rotor,the load distribution characteristics of the supporting bearing of the shafting and the influence of the elevation adjustment scheme of the supporting bearing and the sensitivity of the elevation change of each bearing are researched.The results show that the load of No.4/5/6 bearing is heavier,especially the load of No.5 bearing is the heaviest,and the load of No.2 bearing is much higher than that of No.1 bearing.It is reasonable to adjust the elevation of shafting based on the low-pressure II rotor,but the bearing capacity of No.5/6 bearing are relatively heavy and that of No.7 bearing is relatively light.The influence range of No.5 bearing elevation change is wide,while that of No.6 bearing is very sensitive.

关 键 词：二次再热 轴承标高 轴承载荷 

分 类 号：TM311[电气工程—电机]