Abstract
The rotor of ultra supercritical steam turbine runs in bad condition with high parameters of steam. The large heat stress of rotor may appear when the operating conditions of turbine unit is changed, for example, adjusting load to meet the requirements of peak and valley of grid, especially, improper operation causing serious damage to rotor. According to theory of thermal stress analysis, first, the steam parameters and their heat transfer coefficients of all cascades of 1000MW ultra supercritical steam turbine is calculated. Then the temperature field and stress field of the high-pressure rotor in the process of cold startup calculated by the finite element software are analyzed and discussed. The results are important to the startup and changing conditions of 1000MW ultra supercritical steam turbine unit.
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