某660MW超超临界二次再热汽轮机运行的分析与思考  

Analysis and Thoughts on the Operation of a 660 MW Ultra-supercritical Double-reheat Steam Turbine

作　　者：何胜[1] 刘金芳[2] 谢涛[2] 黄志勇 翟璇[2] He Sheng;Liu Jinfang;Xie Tao;Huang Zhiyong;Zhai Xuan(Huaneng Anyuan Generation Co.,Ltd.,Pingxiang Jiangxi,337000;Dongfang Turbine Co.,Ltd.,Deyang Sichuan,618000)

机构地区：[1]华能安源发电有限责任公司,江西萍乡337000 [2]东方汽轮机有限公司,四川德阳618000

出　　处：《东方汽轮机》2018年第4期5-11,共7页Dongfang Turbine

摘　　要：某660MW超超临界二次再热机组在历时一年半的运行中发现汽缸内外壁温差较小、汽缸中分面汽密性良好,说明该机组结构设计合理。但在大修中发现高中压内缸中分面在空缸自由状态下发生了一定的翘曲变形,为了确定大修时汽缸中分面的处理方案,研究小温差情况下汽缸中分面变形的成因,以及变形对汽缸安全可靠性的影响,文章采用有限元计算和理论分析相结合的方法,模拟分析了该高中压内缸在长期稳定运行后打闸停机、扣空缸自由状态、复装汽缸并热紧全部螺栓等整个过程中汽缸的变形和中分面密封情况。通过计算结果与实测数据相对比,说明计算方法正确,计算结果可靠。A 660 MW ultra-supercritical double-reheat steam turbine units have a little difference in temperature between the inner and outer walls of the cylinder for one and a half years,and the airtightness of casing split is good,which indicates that the design of the unit structure is reasonable.But the split of HIP inner cylinder has a certain warping deformation in the free state during overhaul.In order to determine the treatment scheme for the split surface in the overhauling,and study the causes of the surface deformation in the cylinder of the small temperature difference,and the effect of the deformation on the safety and reliability of the cylinder,the article uses the method of combining finite element calculation with theoretical analysis to simulate and analyze the HIP inner cylinder's deformation and airtightness during the whole process of stopping process after long-time operation,the free state of the sluice cylinder,the reloading cylinder and the tighting of all bolts.The comparison between the calculated results and the measured data shows that the calculation method is correct and the calculation results are reliable.

关 键 词：660MW超超临界 二次再热 高中压内缸 变形 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]