Composite Control of Precalciner Exit Temperature in Cement Rotary Kiln

Introduction　　Thecementkilnisalarge scaledcomplexsystem ,inwhichtheinvolvedcontrolobjectsincluderawmealflow ,exittemperatureofwettower ,negativepressureofkilnheadcover ,spoutwaterofkilnhead ,temperatureinprecalciner ,rotatingspeedofkiln ,strokeofcooling…

Composite Control of Precalciner Exit Temperature in Cement Rotary Kiln

A composite control strategy for the precalciner exit temperature in cement kiln is introduced based on a mathematical model. In this model, the raw meal flow, coal powder flow and wind flow are taken as three input variables, the clinker fow and exit teperature of cement kiln are output variables, and other influencing factors are considered as disturbance. A composite control system is synthesied by integrating self learning PID, fuzzy and feedforward function into a combined controller, and the arithmetics for the self learning PID controller, fuzzy controller and feedforward controller are elaborated respectively. The control strategy has been realized by software in real practice at cement factory. Application results show that the composite control technology is superior to the general PID control in control effect, and is suitable to the industrial process control with slow parameter variation, nonlinearity and uncertainty.