Title

IMPROVING PERFORMANCE OF SEAH’S 70T ELECTRIC ARC FURNACE USING ELECTROMAGNETIC STIRRING

IMPROVING PERFORMANCE OF SEAH’S 70T ELECTRIC ARC FURNACE USING ELECTROMAGNETIC STIRRING

Authorship

Mouls, Philippe; Teng, Lidong; Mehraban, Zaeim

Mouls, Philippe

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Teng, Lidong

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Mehraban, Zaeim

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DOI

10.5151/2594-5300-35075

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Abstract

BOTTOM SKULL FORMATION IS A COMMON PROBLEM IN ELECTRICAL ARC FURNACE FOR HIGH ALLOY STEEL PRODUCTION, ESPECIALLY WHEN A HIGH PERCENTAGE OF FECR IS CHARGED INTO THE FURNACE TOGETHER WITH SHORT TAP-TO-TAP TIME. SKULL FORMATION CREATES A NUMBER OF PROCESS PROBLEMS SUCH AS REDUCED FURNACE VOLUME CAPACITY, LOWER TAPPING WEIGHT HIT RATIO, LOWER STEEL YIELD. THE FORMATION MECHANISM OF BOTTOM SKULL IN A 70-TON EBT FURNACE FOR TOOL AND STAINLESS STEEL PRODUCTION IN SEAH’S STEEL PLANT IN CHANGWON, KOREA HAS BEEN INVESTIGATED. THE EFFECT OF BOTTOM GAS STIRRING AND ELECTROMAGNETIC STIRRING (EMS) ON SKULL THICKNESS REDUCTION HAS BEEN COMPARED. THE RESULTS SHOW THAT EMS IS A MORE EFFICIENT WAY TO REDUCE SKULL FORMATION IN THE FURNACE COMPARED TO GAS STIRRING. THE STEEL TEMPERATURE IN THE BATH IS MORE HOMOGENEOUS AND TARGET TAPPING TEMPERATURE IS CONTROLLED MORE ACCURATELY, WHICH SMOOTHS DOWNSTREAM VOD OPERATIONS. SHORT TAP-TO-TAP TIME AND CONSISTENT FURNACE OPERATION ALSO GIVE INCREASED PRODUCTIVITY. THE EFFECT OF EMS ON ELECTRIC ENERGY AND ELECTRODE CONSUMPTION HAS ALSO BEEN DISCUSSED.

BOTTOM SKULL FORMATION IS A COMMON PROBLEM IN ELECTRICAL ARC FURNACE FOR HIGH ALLOY STEEL PRODUCTION, ESPECIALLY WHEN A HIGH PERCENTAGE OF FECR IS CHARGED INTO THE FURNACE TOGETHER WITH SHORT TAP-TO-TAP TIME. SKULL FORMATION CREATES A NUMBER OF PROCESS PROBLEMS SUCH AS REDUCED FURNACE VOLUME CAPACITY, LOWER TAPPING WEIGHT HIT RATIO, LOWER STEEL YIELD. THE FORMATION MECHANISM OF BOTTOM SKULL IN A 70-TON EBT FURNACE FOR TOOL AND STAINLESS STEEL PRODUCTION IN SEAH’S STEEL PLANT IN CHANGWON, KOREA HAS BEEN INVESTIGATED. THE EFFECT OF BOTTOM GAS STIRRING AND ELECTROMAGNETIC STIRRING (EMS) ON SKULL THICKNESS REDUCTION HAS BEEN COMPARED. THE RESULTS SHOW THAT EMS IS A MORE EFFICIENT WAY TO REDUCE SKULL FORMATION IN THE FURNACE COMPARED TO GAS STIRRING. THE STEEL TEMPERATURE IN THE BATH IS MORE HOMOGENEOUS AND TARGET TAPPING TEMPERATURE IS CONTROLLED MORE ACCURATELY, WHICH SMOOTHS DOWNSTREAM VOD OPERATIONS. SHORT TAP-TO-TAP TIME AND CONSISTENT FURNACE OPERATION ALSO GIVE INCREASED PRODUCTIVITY. THE EFFECT OF EMS ON ELECTRIC ENERGY AND ELECTRODE CONSUMPTION HAS ALSO BEEN DISCUSSED.

Keywords

Electric arc furnace (EAF); Bottom gas purging; Electromagnetic stirring (EMS); Skull formation, Sta

Electric arc furnace (EAF); Bottom gas purging; Electromagnetic stirring (EMS); Skull formation, Sta