Design and realization of automatic control system for boiler based on model free adaptive control

To achieve good performance of the utility boiler, dynamic variables such as drum pressure, steam temperature and water level of drum, etc. must be controlled. According to the operating rules and the characteristics analysis of industrial boiler, a complete control scheme for boiler is designed. Specifically, due to the typical nonlinear and coupled characteristics of outlet pressure of boiler, a model free adaptive control (MFAC) method is used to maintain it at the respected values. The automatic control system is realized by the DCS of SIMATIC PCS 7 Box. Comparisons between MFAC and traditional PID control in detailed prove the practicability and robustness of the MFAC control scheme proposed here.