Mathematical modeling, optimization and computer-based control of a power plant boiler

This study is aimed at the development of a mathematical model of a power plant boiler, representing the complex interrelationship between various boiler variables and operational conditions. A special model updating procedure utilizing on-line process data and assuring the model accuracy, was selected. A simulator, implementing this model in software has been developed. This simulator provided a testing ground for the evaluation of the existing control procedures and development and testing of new ones.; A mathematical model was utilized for the definition of a computer-based system capable of optimizing and maintaining optimal regimes of boiler operation. The process optimization problem was formulated as the minimization of the total amount of water spray used for steam temperature control. A self-tuning control procedure for optimizing the efficiency of the existing control loops of the boiler, was developed. The results were validated on the boiler simulator and showed a noticeable advantage over the existing control approach.; As an alternative to self-tuning control, a robust controller was developed and tested on the simulator. A diagnostic technique, utilizing on-line adjustable parameters of the simulator, was formulated.; The obtained results are scheduled for testing on the Milliken Plant boiler.