Acoustic characteristics of electric arc furnaces

New Arc Stability Index for Industrial AC Three-Phase Electric Arc Furnaces Based on Acoustic Signals

“…Any unbalance between the arcs caused an increase in the amplitude of the first harmonic (120 Hz) of the acoustic signal. [13] Figure 5b also shows harmonics with frequencies below 50 Hz, which, according to studies by Cherednichenko et al [8], are associated with electromagnetic vibrations of the electrodes, electrode clamps, among others. The frequency spectrum of the acoustic signal corresponded only to the first 18 seconds of the acquired signal.…”

“…During the operation of the EAF, electric arcs generate changes in sound pressure causing a high level of noise. EAFs are a source of noise pollution with a negative impact on the health of the personnel operating the furnace [8,9]. Usually, during furnace operation, the experienced operators determine the operation of the EAF, the stages of the melting process, and the quality of the foamy slag from the sound generated by the EAF.…”

“…Usually, during furnace operation, the experienced operators determine the operation of the EAF, the stages of the melting process, and the quality of the foamy slag from the sound generated by the EAF. Although, in practice, measurements of voltage and current signals are mostly used for monitoring, control, and modeling of the EAF [10], previous studies [8,9,11,12] have shown that the acoustic emission (AE) signal can be used to characterize the operation of the EAF.…”

“…The most recent research on the application of acoustic signals in an EAF was focused on evaluating the feasibility of their use to control the different stages. Cherednichenko et al [8] in a laboratory furnace placed three sensors to measure the vibrations which allowed the detection of the EAF's different operating conditions. The feasibility of using AE signals to detect the different stages of the process in the EAF was also described by Fu et al [12].…”

Effectiveness of functioning of arc steel furnaces under changes of voltages in arc discharges

“…The formation of near-electrode processes and borderline thermal layers on the scrap is greatly influenced by the vibrational processes which emerge from the interaction of acoustic energy with hard metal [3]. In such conditions, arc discharges cause mechanical destruction of metal, and arcs tend to cut and break the scrap rather than heat the metal [4][5][6][7][8][9][10][11][12][13].…”