Simulation Of Top Layer Material Surface Shape Control System In Blast Furnace Distribution Process

Blast furnace smelting production process is the first major production link of iron and steel industry,but also one of the important links to reduce energy consumption and environmental pollution.In the process of blast furnace operation,upper loading and lower air blast are regulating the operation of blast furnace condition two main means of the upper loading is affected dealted smooth running,production efficiency,and even a key link in the process of production safety,because of the lack of relevant theoretical support,blast furnace charging operation is still a manual mode based on knowledge accumulation,It brings more negative influence to stable automatic production of blast furnace.Blast furnace charging is the ore and coke furnace charge into the blast furnace in this giant airtight reaction kettle,due to the large blast furnace space is large,each batch furnace charge amount weighs 60 t,granular burden in material surface shape will be formed in the throat of the quality of molten iron,furnace temperature field and gas flow distribution,choose reasonable charge level is the guarantee of blast furnace shape stability along the line,It is an effective way to improve the utilization rate of gas,so the charging process not only shoulders the task of feeding,but also shoulder the task of reasonable distribution of burden in the furnace throat.In this thesis,a control system for the shape of the burden surface is designed,in which the throat part of the blast furnace is taken as the controlled object,the shape of the expected top layer is taken as the set value,the existing distribution matrix calculation method is taken as the control method,and the thickness distribution of the burden layer is taken as the error distribution.In the process of exploring and guiding the control of material surface shape,it is found that the control system needs to solve two major problems: c and how to charge.When to charge can be summed up as the optimization problem of stable operation of blast furnace during charging process.Blast furnace charging is an intermittent charging,continuous hybrid process of blanking,the current cycle loading expect the next cycle loading process between intermittent time,allocation of fixed charge according to the preset loading speed for loading,due to the actual cutting speed is not uniform,the furnace throat stockline position changes,which affects the stability of the blast furnace condition along the line.In this thesis,based on the measured data as a steel plant to analyze the relations between the stability and economic benefit,and then under the single level feedback information fusion to blast furnace throat part equivalent into single let water tank to explore when to charge problem.Hybrid single let water tank liquid level control system mathematical model is set up and give two kinds of control scheme,will expect level instead of material level as goal setting,Combined with the control scheme,incremental PID control and position type control are used to control and adjust the parameter variables respectively.The comparison of the two simulation results shows that the position type control has more ideal effect on the actual high furnace level stability.How to charge can be summarized as the problem of controlling the top layer shape of blast furnace.Although the charge surface shape control has been very mature in a charging cycle,the actual charging process of blast furnace is intermittent and dynamic,not a static process in a cycle.In the charging process,the uneven burden drop will result in different thickness distribution of the material layer consumed in each charging cycle.The distribution matrix obtained from the thickness distribution of the current cycle will change the shape of the top layer of the charge when used in the next charging process.Liquid level position type control is presented in this thesis,on the basis of the extension of the mixed liquid level system to use functional description of the blast furnace burden material surface shape control,because of the burden on the throat radial direction of the actual drop speed difference,this thesis simulate the shape of charge level of the various circumstances change,then draw lessons from non-uniform burden decline model and accurate the model established by simulation experiment.Based on the multi-loop charging model,the non-uniform charge dropping model and the inverse calculation model of the charging matrix,the batch charging process was combined with the continuous discharging process,and the material surface shape hybrid control was realized through the simulation experiment.Finally,the monitoring interface of the control system was established,providing visual interface for the blast furnace operators.