Research On Temperature Compensation Of AOD Furnace Infrared Temperature Monitoring System Based On Bottom Gun

With the booming economy of China,the demand for energy is increasing day by day.However,traditional energy source such as petroleum and coal are non-renewable energy.Both wind and solar energy are low utilization rate due to technological constraints.Therefore,Saving energy and reducing consumption is imminent in China.The metallurgical industry is a traditional high-energy-consuming industry,and the temperature is an important parameter of the smelting process.This article describes the drawbacks of this method,using the thermocouple measurement method for AOD.Aiming to find an accurate temperature measurement method,and can be carried out in real time and continuous measurement.First,this paper discusses the significance of temperature parameters in the metallurgical production process,and then it clarifies the temperature measurement methods used in metallurgical production at home and abroad and its development status.Afterwards,various temperature measurement methods were compared.For the problem of emissivity correction,the infrared double-color temperature measurement method based on the bottom gun was selected,and the original light path system was optimized.The jet flow of subsonic gas at the bottom gun,the jet characteristics of the molten iron in the furnace,the physical structure of the gas and melt interface,and the heat exchange characteristics were analyzed and studied.Based on this,an isothermal blackbody model was established.The feasibility of the infrared temperature measurement system based on the bottom gun is proved by theoretical analysis and experiments.The infrared double light colorimetric measurement method can reduce the interference of dust,background radiation and other factors in the furnace,and improve the temperature measurement accuracy.At present,the existing optical path system divides a beam of light into two independent optical paths through a beam splitter.In this way,the imaging point of the radiation signal may be deviated.For this problem,the optical path of the system adopts a rotation mode.The situation tends to be consistent and basically eliminates this error.In the rotating structure,the wireless power supply method and the infrared data transmission method are used to solve the winding problem of the power supply wire in the rotation process.The design of the preamplifier conversion module and the signal conditioning module circuit effectively solves the problem of detection of the weak signal of the photodetector.Through the testing and debugging of various performance parameters of the optical system,circuit system and the whole machine,the results show that all indicators meet the design requirements.The cooling effect of the bottom blowing gas on the cooling of the solution,the composition and action characteristics of the work between the bottom-blowing gas and the furnace solution were analyzed in detail,and related assumptions were made.At the same time,the oxygen of the bottom-blown gas and the carbon in the molten iron were simultaneously.The exothermic heat of chromium oxidation takes into account and a temperature compensation model is established based on the principle of conservation of energy.After the internal calibration of the thermometer through laboratory calibration and on-site calibration,the thermometer is inspected at the metallurgical site.Practice has proved that the system has high precision in temperature measurement and can be applied in production.At the end of this paper,the temperature field distribution of the AOD furnace water model is initially investigated,and some work ware done to complete the mathematical model of the temperature field in the future.This paper also analyzes the error of the measurement results of the temperature measurement system,and provides direction for further research in the future.