The Research Of Intelligent Control For Boiler's Drum Water-Level

Boiler is thermal power plant usually used in most industrial processes and industrial boiler's control system is a complex control system. Because of scattered equipment, poor management or technical reason, it is difficult to work in good condition for the majority of boilers and increased their fuel consumption and reduced the work efficiency. It is very important to control boiler automatically in safety and stabilization, and boiler's drum water-level is an important variable to be controlled. Boiler's water adjusting process has nonlinearity, instability and delay characters, so it makes higher demand for boiler's drum water-level control system.The boiler's drum water-level system and its dynamic character are analyzed and the model of boiler's drum water-level control system with the simulation software of MATLAB is designed according to 35t/h industrial chain boiler of the FENGHUA Power Company, and simultaneously simulation of intelligent control algorithm for the boiler's drum water-level control system is studied in this paper.Designing models of boiler drum water-level control system mainly includes single-impulse, double-impulse and three-impulse: two former models of which have the features of simplicity and low-cost, but can not control false-water-level; last model of which has the features of complexity and high-cost compared with the two former models, but can control false-water-level and can reach good effective control. The author put forwards the intelligent algorithm based on the model of three-impulse boiler's drum water-level control system and analyses the principle, theory and realization of the algorithms of PID control, fuzzy control and fuzzy-neural control systematically; These algorithms in cascade three-impulse boiler's drum water-level control system are simulated with Simulink; Finally, above-mentioned three algorithms are compared.