Accurately Modeling and Controlling Turbine Rotor Stresses of Steam Turbines through the Real-Time Stress Monitoring Control Algorithms

摘要

Deregulation has forced many utilities into more efficient modes of operation. The installation of Distributed Control Systems (DCS) has provided utility owners with the ability to shorten turbine startup times. The automated turbine startup systems can reduce startup times substantially through the use of real-time rotor stress algorithms. However, the real-time rotor stress algorithms used on some DCS deviate from the original equipment manufactures (OEM) startup procedures and may not provide accurate stress values for all trip events. This could reduced the plant's ability to operate turbines over extended maintenance intervals and result in the failure of some turbine components. Recent technical improvements in transient Finite Element Analysis (FEA) can provide a means to optimize turbine startups without over stressing and damaging the turbine components.