Title

MODIFICATION OF THE DIRECT EVACUATION CONTROL (DEC) SYSTEM FOR TWIN-SHELL EAF

Modification of the Direct Evacuation Control (DEC) System for Twin-shell EAF

Authorship

BELOUS, JIM; NOVOTNY, JUSTIN; DAVIS, JIMMY; RUBIO, CHRIS

BELOUS, JIM

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NOVOTNY, JUSTIN

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DAVIS, JIMMY

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RUBIO, CHRIS

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DOI

10.5151/2594-5327-41889

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Abstract

The current Direct Evacuation Control (DEC) system for the twin-shell furnace failed to provide an adequate off-gas evacuation and forced excessive carbon monoxide combustion in the drop-out chamber, damaging the refractory. Using proper process calculations in combination with CFD techniques, the issue was identified, and a new water-cooled duct design was developed. Installed in 2021, the new duct operated until May 2025 without significant wear

THE PURPOSE OF THIS PAPER IS TO SHOW HOW THE UNDERSTANDING OF THE TWIN-SHELL PROCESS DYNAMICS AND THE PROPER IDENTIFICATION OF THE PROBLEM LEAD TO SUCCESSFUL DEVELOPMENT OF THE 4TH HOLE EVACUATION SYSTEM WITH RELIABLE CAPTURE OF THE FURNACE OFF-GAS AND INCREASED LIFETIME OF THE WATER-COOLED ELEMENTS. THE CLOSE TEAM WORK ALLOWS TO DEVELOP THE CONCEPT OF THE MODIFIED WATER-COOLED DUCT AND FURTHER DETAILED ENGINEERING DESPITE NUMBER OF CHALLENGES AND OBSTACLES DUE TO THE PROCESS AND SPACE REQUIREMENTS. THE UTILIZATION OF THE COMPUTATIONAL FLUID DYNAMIC (FDM) MODELING HELPS TO DESIGN THE NEW WATER-COOLED DUCT WITH MINIMUM MODIFICATIONS TO THE EXISTING DROP-OUT CHAMBER

Keywords

Meltshop Ventilation, Emission Control System, Direct Evacuation, DEC, Water-cooled Duct, Off-gas, E

Meltshop Ventilation, Emission Control System, Direct Evacuation, DEC, Water-cooled Duct, Off-gas, EAF