汽轮机筒形汽缸长期运行变形研究

Research on Deformation of Steam Turbine Cylindrical Casing During Long-time Running

筒形缸具有结构对称性好,温度场、应力场均匀、热应力小、安全可靠性高等优点,被广泛应用于高参数大容量的汽轮机组。随着大量筒形缸检修周期的到来,选取典型机组结合机组运行数据模拟汽缸由初始运行至一个大修期结束返厂拆解检修过程,提取各运行阶段汽缸中分面变形数据,并将汽缸拆解后自由状态下变形值与实测数据对比,验证分析的准确性。就红套环初始过盈量、汽缸材质、运行时内外壁温差对汽缸长时运行后变形影响进行对比分析,提出汽轮机筒形汽缸长时变形控制建议。

The cylindrical cylinder has the advantages of good structural symmetry,uniform temperature field and stress field,small thermal stress,high safety and reliability,and is widely used in high parameter and large capacity steam turbine units.With the arrival of large-number of cylindrical casing maintenance period,select a typical unit to simulate the cylinder deformation process from initial operation to the end of an maintenance period,also include after disassembly and overhaul.Extract the cylinder split deformation data at each operation stage,and compare the deformation value with the measured data to verify the accuracy of the analysis.The influence of initial interference of fastening ring,cylinder material,temperature difference between inner and outer walls during operation on the deformation of cylinder after long-time running is analyzed and compared,and the suggestions for long-time deformation control of steam turbine cylindrical casing are put forward.