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In Study of Molten Iron Temperature On-line Monitoring System on AOD Furnace Based on the Technology of Optical-fiber Colorimetric Thermometer

Author: LiuRun
Tutor: YouWen
School: Changchun University of
Course: Control Theory and Control Engineering
Keywords: AOD bottom blown lance Non-contact temperature measurement online Temperature compensation model LabVIEW Fiber than the color temperature
CLC: TF33
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract

Argon-oxygen refining chromium (Mn) during ferroalloy smelting temperature measurement products for all aspects of the performance of decisive significance. Temperature, deoxidizer loss, reduced oxygen capacity prone to cracking, skin bubbles and other phenomena, ferroalloy products become more internal debris. Meanwhile, the temperature is too low, in turn making molten iron and slag flow variation, impurities in the molten iron is not easy on the turn, inadequate oxygen, decarbonization, dephosphorization and desulfurization. AOD furnace smelting process for online measurement of the temperature will improve the metallurgical process automation. Select paper fiber color pyrometry AOD furnace smelting process for molten metal temperature measurement. Mainly around the study carried out the following tasks: 1. Comparison of domestic and international developments in the field of the status quo. From Planck's radiation law, analyzing dual-wavelength ratio pyrometry principle introduces optical fiber sensing technology. Obtained using fiber ratio pyrometry for high temperature, ultra-high temperature molten iron temperature measurement feasibility. (2) Through the structure of AOD Furnace, AOD bottom blown lance selected as an optical signal acquisition points. Bottom-blown lance smelting to the gas blown into the furnace, while the furnace hot metal receiving end of the light intensity. Sapphire fiber optical signal transmitted to the location a little far away from the furnace. After splitting, filtering, photovoltaic conversion, amplification, optical and electrical treatment, temperature measurement results obtained. Programs written using LabVIEW measurement data in the host computer for processing. Real-time display of temperature values ??plotted temperature curve, historical data query, data backup and storage, the temperature limit alarm settings and other operations. 3 using the least square method and the measured value of emissivity of the relevant discussion of the measurement system may occur in various interference sources and their effects on the measurement results, and the measurement of the ratio of the two signals for the relevant emulation. In order to verify the accuracy of colorimetric temperature measurement method, tunable light source temperature experiments carried out; order to improve the optical fiber temperature measurement system than the color accuracy was simulated in the laboratory working condition AOD furnace IF furnace temperature experiments ; to improve fiber ratio pyrometer AOD furnace smelting process in accuracy, as well as to adapt to the harsh working environment live in Sinosteel Jilin Ferroalloy Factory made 10tAOD furnace temperature field experiments. And the bottom-blown gas in order to eliminate the exchange of liquid iron affect the temperature change during the temperature increase on the accuracy of each sample to the gas-liquid interface between the radiation absorbing properties and functions to establish a temperature compensation mode. Experimental results show that the ratio pyrometry correctness, accuracy while AOD furnace production more in line with requirements. This design of fiber-optic colorimetric online AOD furnace temperature measurement system used in the production of the entire industry will play a guiding role.

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CLC: > Industrial Technology > Metallurgical Industry > Metallurgical machinery,metallurgical production automation > Ferroalloy smelting machinery and production automation
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