Characterization of Process Conditions in Industrial Stainless Steelmaking Electric Arc Furnace Using Optical Emission Spectrum Measurements

Optical Emission Analysis of Slag Surface Conditions and Furnace Atmosphere during Different Process Stages in Electric Arc Furnace (EAF)

“…Similar positioning was used successfully in the previous measurements of an EAF optical emission spectrum. 8) An AvaSpec-ULS3648 High-resolution Spectrometer was used in the measurements. The grating of the spectrometer was 600 l/mm with 500 nm blaze, and the width of the entry slit was 10 μm.…”

“…Previous measurements have focused on the characteristics of optical emission spectra obtained from the industrial EAF. 8) This study focuses on the spectrum types related to the thermal radiation of hot slag or gas and excitation of alkali metals by the exothermic reactions inside the EAF. The advantage of analyzing these types of optical emissions is that they are very frequently observed in industrial furnaces and do not rely on exactly correct aiming of optical fiber, which is required to gain statistically relevant information on the optical emission spectrum of an electric arc.…”

“…The measure-ments of particle emissivity of BOF off-gas suggests that fumes generated during decarburization of steel are optically thick. 9) On the other hand, when gas generation in the EAF is low, the EAF atmosphere may be optically thin 8) making it possible to measure slag surface conditions.…”

On-line Analysis of Cr₂O₃ Content of the Slag in Pilot Scale EAF by Measuring Optical Emission Spectrum of Electric Arc

“…The feasibility of analysing slag compositions from arc plasma with on-line optical emission spectrometry (OES) has been previously studied at the laboratory scale 10) and the feasibility of measuring optical emission spectrum from industrial EAF has been demonstrated. 11,12) During these measurements, it was found that the arc emission spectrum of EAF is dominated by the atoms originating from the slag components. The connection between arc emission spectrum and slag components suggest that the arc emission spectrum can be used to analyse the composition of the slag.…”

“…10,11) It combines the remote data analysis with the possibility to measure the arc phenomena directly. The feasibility of analysing slag compositions from arc plasma with on-line optical emission spectrometry (OES) has been previously studied at the laboratory scale 10) and the feasibility of measuring optical emission spectrum from industrial EAF has been demonstrated.…”