Design And Implementation Of Sintering Terminal Point Control System Based On Frequency Conversion Control

Sintering production is an important process in modern iron and steel enterprises,it is a particularly important link before the blast furnace feeding.With the increasing awareness of environmental protection and energy conservation in the whole society,it is urgent to carry out the improvement of energy conservation and consumption reduction in metallurgical industry.At present,the actual sintering production control technology and automation level in China is relatively low,which limits the quality of sinter to a large extent.As a key link that directly affects the economic benefits of blast furnace steelmaking,it is imperative to improve the sintering process.Therefore,the prediction and control of sintering end point is the key to the whole sintering process.In this paper,based on the background of No.1 sintering machine in the sintering workshop of the ironmaking plant of Hangzhou Iron and Steel Group,the research on the transformation of sintering frequency conversion,the prediction of sintering end point,the stability control and the diagnosis of process abnormality are carried out.Specifically,the following work has been done:(1)The research status of sintering state control and abnormal diagnosis at home and abroad is analyzed.(2)The whole process of sintering process is elaborated in detail,and the characteristics of sintering process and the main control difficulties in sintering process are analyzed.(3)In view of the fact that the automation level of the sintering system of HANGGANG is not high and it is difficult to meet the actual production demand,the transformation design is carried out.It mainly includes the frequency conversion transformation of the main exhaust fan of the sintering machine,which can control the frequency of the main exhaust fan in real time and effectively to stabilize the position of the sintering end point,and can also save energy and reduce consumption,so as to replace the traditional method of controlling the position of the sintering end point by adjusting the speed of the trolley;in addition,the sintering system production abnormality prediction and analysis system is designed to obtain the fault information in time.(4)Aiming at the problem of sintering terminal position control,a fuzzy neural network based sintering terminal prediction controller is established.The current and subsequent control quantities,i.e.main pumping frequency,are obtained by calculating the objective performance function in real time through rolling optimization,so as to obtain the optimal control quantities.The simulation results show that the predictive controller designed in this paper has better control performance.(5)Carry out the actual development and Application on the basis of completing the frequency conversion transformation scheme and controller design.The main functional modules are:data acquisition module,sintering terminal control module,production abnormality diagnosis module and so on.This paper mainly completed the design and project application of the system of sintering terminal point control and abnormal diagnosis,and compiled the related database and control software.Finally,it was debugged and applied in the first sintering plant of HANGGANG group.Through the feedback of the actual operation results,the strategy of this paper improved the position control effect of the sintering end point obviously,and realized the energy saving and consumption reduction at the same time.