Research On Optimized Shutdown Of 330MW Turbine

Rotor is the most important section of the turbine. During start-up & shutdown or theload changing, due to the change of steam parameter, the internal of the rotor being in anunstabilized state and produces biggish temperature grads and thermal stress. Thermal stressof rotor is the key facter of restricts the unit quick start-up & shutdown and the safe operation.Thermal stress analysis that will help us to optimize unit start-up & shutdown and improvethe operation of units safely and economically and be the focus of the power industry.This paper based on the method of finite element by ways of building two-dimensionmodel of turbine HP & IP rotors when in shutdown calculates and analyses temperature fieldand stress field. Especially calculates and analysis the local centralized part on rotors,findsout the laws that governs the changes of HP & IP rotors' temperature field and stress field, soas to make optimal slide shutdown programme for 330MW turbine of DaLaTe Power Plantand enables the max combined stress on rotors surface controlled under 280Mpa. By ways ofusing low parameter and a large steam flow to cool turbine, turbine will be cooled downevenly,therefore,increases the life span of turbine,shortens the time of overhaul ormaintenance,make it easy for maintenance,in the end,improves the availability ofturbine,reduces the consumption of uint power also improves the safe and economic orflexible operation of units.