| Heating furnace is the core equipment of hot rolling production line.However,because its temperature control process has the characteristics of high nonlinearity,large inertia and pure lag,the traditional temperature control strategy often leads to the problems of high fuel consumption,heavy pollution and low outlet temperature accuracy,which is difficult to meet the actual needs of modern production line.Based on the above problems,it is necessary to improve the temperature control accuracy of heating furnace and reduce fuel consumption and pollutant emission by studying the advanced high-precision intelligent temperature control system according to the specific model of heating furnace and the characteristics of steel burning process.This research takes two regenerative pusher reheating furnaces as the research object,and constructs a new intelligent steel burning temperature control system,which has important theoretical guiding significance and practical engineering value.The main work includes:Firstly,aiming at the problems of large atmosphere fluctuation and low temperature control accuracy in the regenerative pusher reheating furnace,according to the actual working conditions,the double cross limiting control strategy of the fuel control system is designed.By comparing the control strategies of double loop ratio control,single cross limiting control and double cross limiting,the design principles and precautions of combustion control process are summarized in detail,which provides key data and reference cases for the design of new intelligent heating furnace or steel burning temperature control strategy.Secondly,aiming at the characteristics of large inertia and pure delay in the fuel control process,different control schemes are quantitatively analyzed by Simulink,and the double cross limiting control strategy is improved based on fuzzy algorithm.By tracking and optimizing the bias function of the double cross limiting method and the positive and negative bias parameters of fuel and air,the full combustion of fuel is realized on the basis of ensuring the temperature accuracy of the heating furnace.Finally,the intelligent system of regenerative pusher reheating furnace with friendly man-machine interface is designed,and the communication process,data storage and intelligent setting of the two-level system are completed.The industrial test of the combustion control system of the heating furnace is carried out.After applying the above core model,the accuracy and stability of the furnace temperature control of the heating furnace are significantly improved,the fine adjustment of the combustion of the heating furnace and the reduction of pollutant emission are realized.Since the new intelligent steel burning system was put into operation on the industrial production line,it has stable operation and high temperature control accuracy.The successful application of the new system not only greatly improves the fuel utilization rate,reduces the pollutant emission and makes it meet the relevant national standards for energy conservation and emission reduction,but also greatly improves the intelligent level of the heating furnace and realizes the one button high-efficiency automatic steel burning.After industrial application,it has created huge economic benefits for enterprises,and the results have broad popularization value. |
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