Research On Modeling And Control Of Burning Zone Temperature Of New Dry Cement Rotary Kiln

Cement rotary kiln is the core equipment of raw material calcination in the production process of new dry process cement.The temperature of the rotary kiln firing zone directly determines the production quality,energy consumption and enterprise cost of cement clinker.Studying the temperature control method of the cement rotary kiln firing zone allows the operator to adjust and control the thermal parameters of the rotary kiln production based on the predicted results in advance,which is necessary to improve the production quality of the cement and reduce energy consumption.First,this article introduces the current research status of the new dry-process cement rotary kiln,and summarizes the research achievements made by domestic and foreign scholars in temperature prediction and control.By analyzing the process of the cement rotary kiln calcination system and the main process parameters affecting the temperature of the rotary kiln firing zone,a preliminary attempt was made to establish a rotary kiln mechanism model.Since the mechanism model is based on certain assumptions,some parameters in the model vary with temperature If the pressure changes and changes,in order to establish a suitable mechanism model,if these changed parameters are assumed to be constant,it is of little significance for practical guidance.Secondly,on the one hand,the new dry process cement rotary kiln has the characteristics of non-linearity,multivariables,strong interference,etc.,and because the static soft sensor modeling method is difficult to reflect the dynamic information of the temperature detection process of the cement rotary kiln firing zone,PCA is used Variables are used for dimension reduction,LSSVM and moving average ARMA are selected to establish the firing zone temperature model,and k-fold is used to optimize the parameters of LSSVM.On the other hand,the actual cement rotary kiln calcination system is a nonlinear and complex industrial system.It is difficult to reflect the dynamic change process of the system using a single linear or nonlinear model.Therefore,the Hammerstein-Wiener model based on least squares support vector machine is used to predict and simulate the temperature of the rotary kiln firing zone.Again,considering that the actual kiln system control process can only use the kiln head coal feed as the control input variable.Since traditional predictive control algorithms are generally applicable to linear systems,the control object is regarded as an ideal linear system,and nonlinearity is regarded as interference outside the system.Generalized predictive control is selected to predict the temperature of the burning zone based on the ARMAX model control.Finally,in order to achieve full-field information operation,the monitoring software Win CC?OA was used to write the rotary kiln monitoring interface,and at the same time,the communication between the monitoring software and MATLAB was realized,and the modeling and control part was implemented on the monitoring software.