Study On Controlling Of Sintering Ignition Temperature And Temperature Profiles Of Sinter Bed

With the rapid development of Chinese steel industry, iron ore sintering as animportant part of the iron and steel production, it’s technical and economic indicatorsdirectly affect the whole iron and steel industry benefits. The intelligent control ofsintering ignition temperature and rational distribution of bed temperature of thesintering process is an important symbol for the production of high quality sinter.According to studying the sintering ignition process and sinter bed temperatureregularities of distribution, can provide theoretical guidance to improve the the sinterquality indicators and reduce the sintering energy consumption.In the process of research, in view of the optimization control of sintering ignitiontemperature, fuzzy PID controller of ignition temperature is designed and establishesthe theory of fuzzy control rules with self-correction factor within whole domain, whicheffectively improve the control accuracy and robustness of ignition temperature. And S7200PLC is used to realize fuzzy PID control algorithm procedures, optimal controlmethod proposed by sintering ignition sintering pot tests simulation and experimentalstudies. The results show that, compared with the conventional PID control mode ofignition temperature, improved fuzzy PID controller has the advantages of fast response,small overshoot, short regulating time, can quickly and efficiently track changes withoptimization ignition temperature.In this paper, two methods have been used to study the sintering bed temperatureregularities of distribution. The first in-depth analysis of the gas-solid phase heatexchange and the physical and chemical changes in the sintering process, combine withthe underlying assumptions of the sinter bed, derive the basic equation of simulationmodel of sinter bed temperature field, and calculate the critical parameters of theequation. Through computer program to solve the simulation model of bed temperatureunder ideal conditions, and analyze their characteristics of temperature distribution.Secondly, use non-contact infrared temperature scanner measure sintering pot verticaltemperature, and method of median filtering processing is performed on the acquiredraw data, for change characteristic of the side plate temperature corresponding to thebed temperature, in-depth study of the distribution characteristics of bed temperature insintering process. For the developing and application of bed temperature model andsystem software base on side plate temperature, provides a new way to study the sintering bed temperature regularities of distribution, and it will have broad applicationprospect.According to experimental study the sintering bed temperature regularities ofdistribution, the ideal bed temperature curve should be met as far as possible: themaximum temperature of the bed is less than1300℃; sintering time of cokecombustion zone should be as short as possible, so as to effectively reduce the amountof FeO, to improve the reducibility of sinter; sintering time of melt solidification zoneshould be as long as possible, help to slowly crystallized and condensation, so that thematerial layer can complete crystallization and form a uniform material phase, caneffectively improve the strength of the sinter, and can decrease the FeO content in sinter,improve sinter reducibility.In order to study the reasonable distribution of sinter bed temperature, this paperfurther analyzes the the influence of operating parameters such as the fuel ratio, air flow,ignition temperature to the distribution of bed temperature in the sintering process.According to the experimental results, the relevant operating parameters should beappropriate adjusted, in order to achieve the rationalization of distribution of the sinterbed temperature field, thereby effectively improve the sinter production quality, andreduce energy consumption.