The Optimum Design Of RH Refining Furnace Steel Temperature Real-time Monitoring System

In metallurgy, petrochemical and other industries, the primary goal is to increase their productivity and production quality.this requires a good control to various processes and corresponding parameters of the production process,among which the most important parameter is the surface temperature of the heating workpiece.It is very critical to get the surface temperature of the heating workpiece accurately and timely.For example,in smelting,the level of steel surface temperate will determine whether it has good metallurgical properties.Currently,there are two common temperature measurement techniques in the country,one common is thermocouple thermometry,the other is blackbody cavity thermometry put forward by Northeastern University.the former belongs to contact thermometry,which is to be considered more reliable but have Significant limitations than others,and also,the success rate of this measuring is not very high.Although the latter is part of the contact thermometry,the temperature probe is placed in the blackbody cavity before insert into the steel,and the temperature measured has a high hysteresis,too.Typically, the average response time is about50seconds,so it does not meet the purpose of real-time temperature measurement.Refining technology has been developed unprecedented and achieve a precise control initially under the the advanced automatic control and a complete model of the control system,however,the steel temperature detection of RH refining process has yet to achieve real-time and continuity,which is still obtained by inserting the thermocouple probes located on-site into the steel repeatedly.This approach requires coordinate with artificial and lacks of appropriate temperature control model,which completely depends on empirical guidelines.So,it exists a lot of problems such as prodigious labor intensity, the lagging time and discontinuities of the temperature measuring.This project adopts near-infrared colorimetric thermometry technology,which is an on-line monitoring thermometry technology composed by digital imaging technology, optical sensing technology and signal processing technology,etc.The technology is one of the fastest growing thermometry technology and has been widely used in many industries currently.An infrared CCD forms images through receiving the infrared radiation launched by the surface of objects and transmits to the computer processing system in the form of digital signals,then determines the temperature distribution of the surface of objects accurately according to the analysis results of radiation images received,which has the advantage of reliability, timeliness and accuracy.Based on many advantages of near-infrared colorimetric thermometry technology,we had designed and developed a set of RH refining furnace steel temperature real-time monitoring system through some researches,and optimize the parameters of software and relational equipment to make the device more stable,the temperature more accurate and the system more functional.After that,it had been applied to the RH refining furnace of Ma-steel,through which accessed the real temperature of the furnace by collecting and analyzing the infrared images to guide the operating such as dusting,blowing and adding aluminum accurately.The research of this project has very important practical significance in improving the quality of steel products, reducing production costs and improving RH production efficiency.etc.