Control Of Boiler Burning System Based On Fuzzy Control Theory

ShiHezi Heating Company has been established since 1988, its 26# heating station takes on the heating task all through. Equipment has been renovated many times, but heating energy waste is very high for lots of reasons, one reason is burning control level is very low.In this paper, two 50t/h coal-fired boilers' burning control system of 26# heating station was studied as its thesis, the primary PID controller was improved as its purpose, Fuzzy control theory developed rapidly at present was applied as its means. The design scheme is that controlling transducers change rotate speed of supplying coal electromotor, fan, and blower using 8051 micro-controller. It realized computer control of burning process. This system finished supervisory control of boiler burning, sampled signals through sensors and calculated the signals whether reached the best content of oxygen and the best wind-coal ratio. Using it controls the quantity of coal, entering wind and sending wing for reaching the best thermal efficiency of burning and improving economy benefit of boiler running. Simulation of boiler burning control system was also performed to study the controller's self-adaptive fuzzy control by MATLAB.Aiming at the nonlinear object of boiler with instability parameter and difficult building math model, using traditional PID controller can't reach the best effect. Combining fuzzy control theory and PID control, an adaptive controller to control boiler is proposed in this paper. And the capability of the self-adaptive fuzzy controller was studied using MATLAB simulation. Simulation result shows Fuzzy-PID is better than PID controller. Fuzzy-PID has many characteristics, such as small exceeded value, short transition, better stability and strong adaptability etc, and can reach anticipative control effect.