Eccentric Bottom Tapping Electric Arc Furnace

Equipment and Parameter Introduction

EBT Electric Arc Furnace | Core Equipment for High-efficiency Slag-free Tapping & Short-process Steelmaking

1. Equipment Composition

1.1 Furnace Body System

• Furnace Shell: Divided into upper and lower shell. The lower part adopts nasal elliptical eccentric structure, lined with magnesium carbon brick / alumina-magnesia refractory brick. Water-cooled furnace wall coverage reaches 87%-90%.
• Water-cooled Furnace Roof: Fully water-cooled structure with electrode hole in the center, equipped with sealing and smoke exhaust device.
• Eccentric Tapping Box: Tapping hole set at the eccentric position of furnace bottom, matched with sliding gate / stopper opening and closing mechanism, filled with magnesia drainage sand for automatic pouring start.

1.2 Mechanical System

• Electrode Lifting Mechanism: Copper-steel composite / aluminum alloy conductive cross arm with servo drive to adjust electrode lifting and arc power.
• Furnace Tilting Mechanism: Hydraulic drive. Tilting angle on tapping side is only 5°-15°, with simplified structure and reduced short network loss.
• Furnace Roof Lifting & Rotating Mechanism: Electric / hydraulic drive, cooperating with scrap charging and furnace maintenance.
• Oxygen & Carbon Injection Lance System: Furnace wall bundled jet design, supporting foamed slag submerged arc smelting, enhancing oxygen supply and carburizing efficiency.

1.3 Electrical System

• Furnace Transformer: Ultra-high power configuration, unit power ≥ 600kVA/t, providing stable arc power supply.
• Short Network System: High-current conductive loop with low impedance design to reduce power loss.
• PLC Automatic Control System: Integrated electrode regulation, power control, tilting operation and safety interlock, supporting remote monitoring and data traceability.

1.4 Auxiliary System

• Water Cooling System: Closed circulating water cooling key components such as furnace shell, furnace roof and electrode cross arm.
• Hydraulic System: Providing power for furnace tilting, electrode lifting and tapping hole opening & closing.
• Dedusting & Smoke Exhaust System: Equipped with bag dust removal / waste heat recovery to meet environmental protection standards.
• Ladle & Ladle Car: Undertaking molten steel and matching with LF/VOD refining process.

2. Main Technical Parameters (Standard Reference)

3. Performance Advantages

1. Slag-free Tapping & Pure Steel Quality: Eccentric bottom tapping with small-angle tilting retains slag inside the furnace, effectively reducing phosphorus and sulfur content, suitable for high-carbon steel and alloy steel production.
2. High Efficiency & Energy Saving with Cost Optimization: Smelting cycle shortened by 20%, heat loss reduced by about 20%; refractory service life extended by 15% with lower consumption.
3. Safe, Stable & Easy Operation: Avoid splashing risk of traditional tilting tapping; automatic pouring start rate over 90%, PLC one-key operation reducing labor intensity.
4. Compatible with Short-process Production: Can be matched with LF refining and continuous casting equipment to realize EAF-LF-CC short-process production, with annual output up to 400,000–800,000 tons.

4. Application Scope