Equipment Modeling And Operating Initial Steam Pressure Optimization Of Large Condensing Steam Turbine System

The research on equipment modeling and operating initial steam pressure optimization of large condensing steam turbine system plays a crucial role in mastering the operating characteristics of steam turbine system and improving the thermal economy of the units.Therefore,taking the steam turbine system of a 660 MW supercritical unit as the object,this paper established the characteristics model of each equipment based on the mechanism and the hybrid model of steam turbine system combining the mechanism and data in considering the deviation between the mechanism model and the actual measurements.The optimization of operating initial steam pressure was carried out based on the hybrid model.The main research contents were as follows.First of all,the steam turbine system model based on the mechanism was established by connecting the characteristics models of the turbing iroper,the cold-end system,the regenerative system and the water supply system through the relationship between the parameters of each system,which is the foundation of model modification and operating initial steam pressure optimization in post chapters.Secondly,a hybrid model of steam turbine system was established by connecting the mechanism model and the data-driving model which was established by the least squares support vector machine based on the actual operation data.The hybrid model is close to the actual operation state of the unit and has high precision,which guarantees the reliability of the initial pressure optimization.Furthermore,an optimization model was established considering the heat consumption rate of steam turbine as well as the energy consumption of condensate water pump and circulating water pump.Based on the model,the optimal operating initial steam pressure was given as well as the corresponding optimal circulating water pump operation mode and valve opening of steam distribution mechanism when the weather condition and unit load were known.Finally,according to the models the paper established and the final optimization results,the platform of steam turbine system performance monitoring and optimization of operating initial steam pressure was developed based on Visual Studio.Net and PI database.