Title: The Influence of Rotor Physical Property on Thermal Stresses in a Supercritical Steam Turbine during its Startup
Abstract: In most cases steam turbine rotors are made of 30CrMoV low carbon alloy steel,the physical property parameters of which change significantly with temperature.The model established for calculating rotor thermal stresses has taken into account the influence of the temperature-dependent change of rotor-material physical property.Through a simulation test,analyzed was the variation tendency of rotor thermal stresses in a domestically-made 600 MW supercritical steam turbine under the following four start-up operating conditions,namely,cold-state,warm-state,hot-state and extremely-hot-state.Moreover,the tendency in question was compared with that obtained from a thermal-stress model featuring a rotor of constant physical property.It has been shown that the change of rotor material physical parameters with temperature will significantly influence the magnitude of the start-up thermal stresses.The above finding can provide a helpful reference for enhancing the calculation accuracy of an on-line monitoring model involving turbine-rotor thermal stresses.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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