Comparison and Analysis of Simulation Calculation and Measured Data of LP Inner Casing of 1000MW Nuclear Steam Turbine
A 1000MW nuclear power half-speed steam turbine adopts the structure of low-pressure inner cylinder independent landing,and the low-pressure outer cylinder is rigidly-connected with the condenser.due to its large size,heavy weight,low rigidity and complex structure of the LP inner cylinder.Under the influence of their own gravity,they will undergo certain deformations in installation process,thereby changing seal clearance of steam passage.especially the seal clearance in the vertical direction.The change of the clearance will not only affect the thermal efficiency of the unit,but may also cause friction between the static and dynamic parts,which will affect the operation of the unit.In order to accurately obtain the internal clearance value of the LP cylinder during the maintenance of the unit.By establishing a high and intermediate pressure casing model of a 1000MW nuclear steam turbine,the deformation in installation process is numerically calculated,and the change of seal clearance is obtained by analyzing the relative deformation of the casing under different conditions.At the same time,the vertical deformation data of the LP inner cylinder,the half-cylinder and the full-cylinder state clearance data were collected and sorted out,and the modeling calculation data and assembly data were compared and analyzed.
万方数据
维普
