Research On Coordinated Control Of Cooling Process Of New Dry Process Cement Production

The cooling process of the cement clinker is an important part of the cement production process,which has an important impact on ensuring the quality of the clinker,increasing the temperature of the second and third air,ensuring the heat recovery,and improving the calcination of the clinker.This process mainly achieves its related function through the reasonable control of the grate cooler.However,due to the low level of automation in the domestic cement plant production line,the main monitoring points in the production process are imperfect and the grate cooler have non-linear large lag characteristic,leads to the information collection is incomplete,As a result,most of the domestic control of the grate cooler is manually controlled by the operator.Because the control process has a certain subjective judgment by operator,so the control effect is often not satisfactory.In view of the current status of control of grate cooler in the clinker cooling process,Some scholars have made relevant research on the optimal control of grate cooler,and the control result has been improved compared with the previous manual control.But after reading a lot of literature,it is found that the research on the optimal control of the grate cooler is mostly limited to the optimization control of the single process,but the cement production industry is a typical process industry,in the actual production process of cement,there has the characteristics of multi-variable coupling in each process,the optimal control of the parameters of a single process will cause the working conditions of the related process to change,which will adversely affect the cement production.Therefore,based on the research of single preocess optimization control of the grate cooler,we have made analyzed on the main coordination relationship of the clinker cooling process.Utilizing the coordinated relationship of the clinker cooling process to optimize the control of the grate cooler,it is of great significance to stabilize the production while ensuring the related effects of the clinker cooling process and reducing the fluctuation of the working conditions of the relevant process.The specific research contents of this article are as follows:(1)By analyzing the main coordination relationship of the clinker cooling process,the coordination relationship of the clinker cooling process is divided into three parts: the interaction between the grate cooler and the rotary kiln,the influence of the grate cooler and the rotary kiln on the thermal efficiency of the grate cooler and the influence of grate cooler and rotary kiln on the quality of clinker.After selecting relevant monitoring parameters according to the coordination relationship of the clinker cooling process,the coordinated control system of the cement clinker cooling process is divided into two parts: Optimal setting system of grate cooler pressure based on coordination relationship and automatic control system for cooling process of cement clinker.(2)A multi-model fusion neural network algorithm is proposed,which can balance the advantages and disadvantages of a single algorithm's ability to express data,and can improve the accuracy of related results through continuous learning of historical data.(3)Optimal setting system of grate cooler pressure based on coordination relationship.According to the relationship between the grate cooler and the rotary kiln,a multi-model fusion neural network is used to establish a pre-set grate cooler pressure model;Then according to the relationship between the grate cooler and the rotary kiln on the thermal efficiency of the grate cooler,a grate cooler pressure compensation model based on secondary air temperature judgment was established;Finally,according to the relationship between the influence of grate cooler and rotary kiln on the quality of clinker,the grate cooler pressure correction model was established based on the Fuzzy system.Through the three models work together,it can provide optimal setting value of grate cooler pressure under current cooling process coordination relationship.(4)Automatic control system for the cooling process of cement clinker.According to the two controlled variables of grate cooler pressure and secondary air temperature involved in the optimal setting system of grate cooler pressure based on the coordination relationship,the characteristic analysis of grate pressure and secondary air temperature is carried out.Then take the simulation results of the traditional PID controller for grate cooler pressure as an example,according to the simulation results to improve the traditional PID controller,a multi-modal controller based on integral separation PI control algorithm is proposed.This controller can use Bang-Bang controller and Fuzzy controller to correct the integral separation PI controller under different control rules.Eventually,the grate cooler pressure will be stably controlled near the set value,and secondary air temperature will be stably controlled within a reasonable range.(5)According to the control scheme,the coordinated control software of the cement clinker cooling process was developed.The software was applied in the cement production site,meanwhile the application effect was demonstrated.