Development Of Thermal Stress Monitors System Of1000MW Ultra-supercritical Steam Turbine Rotor

With the development of electric power industry, energy conservation and small units out of the grid, it is the trend that the large capacity units take part in load of electric. In order to ensure the safety of the peaking units and improve the economic efficiency of plant operation, it is necessary make a thermal stress on-line monitoring system for the steam. The ultra-supercritical units has the significant effect of energy-saving and environmental improvement, the future construction of thermal power unit will be the development of high efficiency, high parameters of supercritical and ultra supercritical. During the unit being started, stopped and load changing, the rotor will have a greater thermal deformation and thermal stress. Rotor is the most important component in the steam turbine, whose life will affect the unit’s life. The rotor which should receives significant attention during the development of the steam turbine rotor thermal stress of on-line monitoring system is the main components of the unit.Firstly, the thesis describes the basic mathematical model of the thermal stress for the rotor on-line monitoring system. According to the one-dimensional unstable heat conduction equation, we obtaine the rotor’s temperature and stress distribution. On the basic of the first boundary condition for the recursive algorithm, we can develop the on-line monitoring system.Seconndly, the thesis takes a certain power plant1000MW ultra supercritical steam turbine unit for research object. Using the finite element software ANSYS, we can find risk area section of the rotor. This will provide the basis of the implementation of the on-line monitoring systems for the dangerous parts in the rotor.Finally, by means of computer programming language Delphi, the thesis develop a complete on-line monitoring system. The system can enable some particular functions, such as real-time monitoring, automatic alarm and historical dada query. The on-line monitoring system can ensure that the unit starts normally and operate safely.