Vacuum Degasser
60t Vacuum Tank Degassing Station
Technical Details
Manufacturer: Tenova
Heat Size: 60t
Year of Manufacture: 2005/2008
Type / Scope: Stationary-vessel-type vacuum tank degassing (VD) station for ladle metallurgy, for a 60t heat, serving the meltshop downstream of the EAF/Ladle Furnace.
Key technical data:
- Vacuum vessel: cylindrical, welded boiler-quality steel plate, open top with machined flanged rim; internally refractory-lined (refractory supplied by customer)
- Vacuum vessel - overall top diameter: 6100mm; top diameter inside refractory: 5700mm; internal depth inside refractory: 4330mm; total vessel height: 4600mm
- Vacuum vessel - free internal volume (closed): ~110 m³; weight (refractory-lined): 23 (48)t
- Vacuum off-take duct diameter: 914mm (36")
- Vacuum vessel cooling water flow: 30m³/h (seal-ring housing flooding)
- Vessel safety features: aluminium rupture disk near vessel bottom (emergency discharge on ladle breakout) and vacuum-tight inspection hatch
- Vacuum vessel cover: dished top closure, cylindrical flanged body, diameter 6100mm, height 1450mm, weight (refractory-lined) 7 (11)t; cooling water flow 3 m³/h
- Vessel cover fittings: observation port with CCTV camera mount, manual/motorised bath-boil control valves, DN 250 water-cooled port for sampling/temperature lance and wire feeding
- Heat shield (suspended inside cover): diameter 2900 mm, height 520mm, sight-port hole diameter 360 mm, weight (refractory-lined) 1.7 (2.7) t; height adjustable ~150 mm relative to ladle rim
- Vacuum vessel cover gantry transfer car: lifting capacity 20t, lifting height 800mm, opening/closing speed 1 m/min, traveling speed 0–15 m/min, track rail gauge 6600 mm, run-way distance ~8m, weight 6t
- Gantry car drives: 2× hydraulic cylinders driven by 2× 15 kW hydraulic pumps; 2× 10 kW transfer motors; piston-accumulator backup for cover lift/travel on electrical power failure
- Ladle freeboard requirement for VD treatment: 800-1000mm (achieved via new ladle design, see Appendix 3)
- Vacuum pumping system: dry mechanical ROOTS-type, 4-stage arrangement (Stage 1: 4× high-vacuum ROOTS pumps, belt drive; Stages 2–3: 2× high-vacuum ROOTS pumps each, direct coupling, frequency-controlled, with tubular water/air heat exchangers; Stage 4: 2× dry primary ROOTS pumps, belt drive)
- Vacuum system performance: total volume to be evacuated ~200 m³; pump-down time to 67 hPa: 4 min; to 0.67 hPa: 6 min; suction capacity 1600 kg/h DAE @13.3 hPa, 80 kg/h DAE @0.67 hPa; ultimate vacuum pressure ≤ 0.2 hPa
- Vacuum system power: total installed motor power 600 kW; peak power absorption ≤300 kW; average power absorption 150 kW
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