350MW超临界汽轮机冷态启动中压缸胀差大的分析及处理  

Analysis and Treatment on the Excessive Expansion Difference of Medium Pressure Cylinder During the Cold Start-up in a 350 MW Supercritical Steam Turbine

作　　者：吴兴无 姚志宏 邱琛 谭锐 何新荣 Wu Xingwu;Yao Zhihong;Qiu Chen;Tan Rui;He Xinrong(China Energy Suzhou Thermal Power Co.,Ltd.,Suzhou 234000,Anhui Province,China;China Energy Science and Technology Research Institute Co.,Ltd.,Nanjing 210046,China)

机构地区：[1]国家能源集团宿州热电有限公司,安徽宿州234000 [2]国家能源集团科学技术研究院有限公司,南京210046

出　　处：《发电设备》2023年第1期71-74,共4页Power Equipment

摘　　要：某电厂5号和6号350 MW超临界机组汽轮机投运以来冷态启动过程中一直存在中压缸胀差偏大的问题,造成机组启动时间过长和脱硝系统不能及时投入运行。分析中压缸胀差偏大的原因后,采用调整轴系K值、增加中压缸夹层加热系统、优化冷态启动过程等措施。结果表明:采取相应的措施后,2台机组汽轮机冷态启动过程顺利并能按启动要求带满负荷。For the 350 MW super critical units in a power plant,the expansion differences of the medium pressure cylinders were excessive during the cold start-up of the steam turbines in the No.5 and No.6 units,which leads to the long start-up time of the units and the operation delay of the denitration system.Analyses were conducted on the excessive expansion differences of the medium pressure cylinders,and following corresponding measures were carried out,such as adjusting the K value of the shaft clearance,adding the heating system between the inner-shell and outer-shell of the medium pressure cylinder,optimizing the cold start-up process,etc.Results show that,through adopting corresponding measures,the cold start-up processes of the steam turbines in the two units are smoothly,and the units can reach full load with the start-up requirements.

关 键 词：超临界机组 汽轮机 冷态启动 中压缸胀差 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]