Design And Optimization Of Hot Blast Stove Control System

Blast furnace ironmaking is a production unit with high energy consumption and high resource consumption.With the massive growth of iron and steel output,the product structure is constantly optimized.In order to achieve the upgrading of ironmaking technology,efficient utilization of energy and reduction of pollutant emissions,it is an important goal to actively promote the efficient production of blast furnace ironmaking,energy conservation and environmental protection to promote the development of the steel industry.With the development of industrial level,the more urgent demand for high blast temperature,blast furnace in order to make the high blast temperature,blast furnace must be equipped with a stove,a heat storage capacity now to improve the hot blast stove heat storage capacity,reduce energy consumption,and can provide stable and continuous high temperature hot blast furnace,is the industrial production of one of the important research topic.The hot blast stove play a crucial role in the blast furnace ironmaking,in the hot blast stove control system,combustion control is the core of it,but still is give priority to in order to manually adjust the control way,can cause a certain error,the result caused by a lack of internal control level,lead to air temperature is generally low,and the traditional control mode there are also some disadvantages,adjust the lag and imprecise problems.Therefore,accurate and effective control of vault temperature and exhaust gas temperature can improve the temperature of hot air and save fuel.This design is mainly aimed at the design and optimization of hot blast stove combustion control.First of all,according to the process configuration of the field hot blast stove,this paper analyzes its combustion control process requirements;The overall framework and function of the control system are given.The lower computer system designed by PLC is completed,and the corresponding hardware configuration and software design are given.Through the analysis and processing of the field data,the best range of air fuel ratio and gas flow was found by using the scatter diagram and curve fitting,which saved the cost.The energy consumption and average value of gas are calculated and optimized to save energy.Secondly,through the analysis of the characteristics of hot blast stove combustion changes,the vault temperature and exhaust gas temperature are effectively controlled,and the fuzzy PID algorithm for the vault temperature control scheme,and simulation,the control effect is obtained.In the exhaust gas temperature management period,BP neural network is used to model and predict the exhaust gas temperature,and a fuzzy waste temperature controller is designed to control the heating rate of waste temperature.The dynamic performance is good,which can provide reference for the debugging and maintenance of the control system.A switching controller is designed to realize the undisturbed switching between the rapid combustion period and the heat storage period.Finally,the fuzzy PID algorithm is implemented on PLC,and the application of fuzzy PID algorithm in engineering is realized by writing modular program in STEP7.In order to meet the on-site process requirements,the upper computer monitoring system is designed,including the hot blast stove monitoring screen,single furnace control screen,real-time curve monitoring and communication functions,and the gas flow and air flow regulation mode is optimized,and the comparison of manual adjustment and automatic adjustment shows that the automatic control effect is good.