HEAT TREATMENT:
BELL ANNEALING FURNACES WITH HYDROGEN (H2) ATMOSPHERE
NR. 5 HEATING BELL
NR. 10 BASES ‐ DANIELI SUPPLIED IN 2017
NR. 10 INNER COVER
NR. 3 COOLING BELL
NR. 40 SEPARATOR
PRODUCTION DIMENSIONS
Material steel grade: CQ, DQ, DDQ, EDDQ
Material steel grade: NGO highperm 1%
Coil size:
ID 620mm
OD 900 - 1,950 mm
Width 900 - 1,270 mm
Strip Thickness 0.35 - 1.6 mm
COIL DIMENSIONS
ID 620mm
OD 1,908 mm
Width 1,250 mm
Strip thickness 0.8 mm
Weight 25 ton
COIL WEIGHT
Max 20 kg/mm
No. of coils per stack: 4
WORKBASE LOADS
Workbase max 105 MT
Net charge max 100 MT
Workload space:
Diameter 2,000 mm
Pilling height 5,300 mm (assuming intermediate & top convector)
OPERATING CHARACTERISTICS
Heating
No. of Burners: 8 / furnace
Unitary power: 170 kW/burner (146.200 kcal/h /burner)
Install thermal power: 1,360 kW/furnace (1,169,600 kcal/h /each)
5,440 kW tot (4,678,400 kcal/h tot)
Operating temperature: Max 850 oC
Heating chamber temperature: Max 1000 oC
Combustible type: NG (natural gas)
Combustion air fan power: 7.5 kW/each
Combustion air flow: 1,600 Nm3/h /each
RECIRCULATING FAN
Coupling: direct
Speed: Variable by inverter from 500 up to 2000 RPM
Flow rate: up to 80,000 m3/h
Power: 25 kW/each
Cooling: air and water (flow rate 0.7 m3/h approx.)
Thermal protection: 3 PTC sensors inside the windings
Special: process gas flows through the motor.
COOLING HOOD
Cooling fan air flow: 3 x 12,000 Nm3/h /each
Cooling fan electrical power: 3 x 2.2 kW/each
PURGING PROCESS GAS
Atmosphere: Nitrogen (N2)
ANNEALING PROCESS GAS
Atmosphere: Hydrogen (H2) / Nitrogen (N2)
PLANT LAYOUT
Area capacity: 10 bases, 6 heating bells and 4 cooling hoods
Plant length: abt. 40,800 mm
Plant width: abt 13,000 mm
Plant height: abt 8,000 mm (over lev.0.00)
Plant overall height: abt. 16,800 mm (for furnace hoisting by crane)
Foundation deep: + 800 mm
UTILITIES
FUEL
Fuel type: Natural Gas
PURGING GAS (Nitrogen)
Maximum oxygen (02) content: 10 ppm
HYDROGEN ATMORPHERE
Maximum oxygen (02) content: 10 ppm
COOLING WATER FOR:
Motor fan and base gasket
Cooling hood
ELECTRICITY
Voltage: 380V +/-10%
3 phase AC
Frequency: 50 Hz +/- 1 Hz
Actuators, auxiliary equipment and instruments: 110 V AC
Limit switches, lamps, push buttons and PLC in/out cards: 24 V DC
LUBRICANTS
Type: ESSO UNIREX 4 or similar
