槽式光热电站汽轮机大修问题分析及对策  

Analysis and Countermeasures of Overhauls of Turbine inTrough Photothermal Power Station

作　　者：王自发 刘一丁 杨涛 刘荣 陈晨 WANG Zifa;LIU Yiding;YANG Tao;LIU Rong;CHEN Chen(CGN Delingha Solar Energy Co.,Ltd,Delingha 817000,China)

机构地区：[1]中广核太阳能德令哈有限公司,青海德令哈817000

出　　处：《内蒙古电力技术》2024年第3期28-32,共5页Inner Mongolia Electric Power

摘　　要：中广核太阳能德令哈有限公司50 MW槽式光热示范电站汽轮机在首次大修中发现双轴系转子找中心测量误差超限、汽轮机高低压缸末级动静叶片水蚀及汽水疏水管道弯头频繁泄漏等典型问题,对其进行原因分析,确定双轴系转子找中心测量误差超限原因为减速机高速轴中间过渡轴因自重牵引减速机高速轴下沉引起测量误差;汽轮机高低压缸末级动静叶片水蚀严重原因为高压中温机组高压缸排汽存在蒸汽带水情况,机组低负荷、低背压长时间运行,导致高低压缸末级蒸汽湿度增大,加剧了水蚀作用;汽水疏水管道弯头泄漏原因为机组疏水使用频繁,蒸汽湿度升高及安装时吹管不彻底,汽水管道内存有焊渣等杂质,导致浮球式疏水器无法形成凝结水,管道弯头长期经受汽水混合物冲蚀,使管壁减薄、泄漏。后经处理后,以上问题得到解决。The typical problems encountered in the first overhaul of the steam turbine of CGN Delingha 50 MW trough photothermal Demonstration Power Station are analyzed in this paper,such as excessive measurement errors in the center finding of the dual⁃axis rotor,water erosion of the turbine′s high and low pressure cylinder end⁃stage dynamic and static blades,and frequent leakage of the elbows of the steam and water drainage pipelines,etc.The reason for the exceeding measurement errors in the center finding of the dual axis system rotor is determined to be the measurement error caused by the sinking of the high⁃speed shaft of the reducer due to self weight traction.The serious water erosion of the dynamic and static blades at the end stage of the turbine high and low pressure cylinders is caused by steam with water in the exhaust steam of the high pressure cylinder of the high pressure and medium temperature unit,and the long time operation of the unit with low load and low backpressure leads to the increase of the humidity of the steam at the end stage of the high and low pressure cylinders and aggravates the effect of water erosion.The frequent leakage of steam and water drainage pipeline elbows was caused by frequent use of unit drainage,increased steam humidity,incomplete blowing during installation,and impurities such as welding slag,which prevent the floating steam trap from forming condensate.The steam and drainage pipeline elbows are subjected to erosion for a long time by the steam and watermixture,resulting in the thinning and leakage of the pipe wall at the elbow.After treatment,the above problems are solved.

关 键 词：槽式光热电站 汽轮机 双轴系转子 末级叶片 疏水管道 

分 类 号：TM615[电气工程—电力系统及自动化]