EBNER GAS-FIRED HICON/N2 BELL ANNEALER FACILITY, TYPE HOG 430/250 ST-N2-D, TO

ANNEAL STEEL WIRE COILS IN STRAIGHT NITROGEN ATMOSPHERE

TECHNICAL DATA EACH UNIT

Effective dimensions of workload space:
Diameter (cylindrical baffle): 4,250 mm
Stack height: 2,500 mm

Processing temperature range
(Inside inner cover): 500- 810 oC (short time 840 oC/3 % of production)

Temperature ceiling In heating chamber: 900 oC

Combustion system rating: 1,400 kw
Number of heating control groups: 1
Maximum load on workbase: 32 t
Net charge: max. 30 t
Inner cover handling: crane attachment
Wire coil handling: wire coil carrier
Handling for heating and cooling bell: overhead crane

Material to be processed: wire rod medium and high alloyed grades (e.g. C45,

42 Cr Mo 4, 100 Cr 6)

Maximum / minimum coil dimensions:
- outside diameter of coil: max. 1,350 mm
- inside diameter of coil: abt. 850 mm
- wire thickness: max. 57 mm min: 5.5 mm
- coil height: max. 2,500 min
- coil weight: max. 3.0 t

REFERENCE DATA

Type of heat treatment: spheroidization anneal in nitrogen

Material:37 Cr 4

Coil dimensions:
- outside diameter of coil: 1,300 mm
- inside diameter of coil: 850 mm
- coil height: 2,500 mm
- wire thickness: 19 mm
Coil weight: ca. 3.0 t
Number of coils/workbase: 7
Net weight:abt. 21 t
Temperature data:
- working temperature: 765/755 oC


Times:
- heating-up time (incl. Technological): abt. 11 hours abt. 6 hours
- cooling time (250c): abt. 6 hours

Net throughputs:
- heating bell: 1.9 t/h
- cooling bell: 3.5 tlh
- workbase: 1 .16 t/h

CONNECTED SUPPLIES

Electricity:abt. 300 kva (demand factor 100%)
Fuel gas (natural gas):2.800 kw (abt. 284 m3/h) (demand factor 100 %)
Cooling water:max. 7.8 m3/h
Nitrogen:max. 562 math

MOTOR LIST (PROVISIONAL)

-2 combustion air blower, 11 kW, 3000 spm
-3 workbase fan, 55 kW, max. 1200 spm
-4 cooling air blower, 5.5kW, 1000 spm
-1 hydraulic pump, 4.0 kW, 1500 spm

SCOPE OF SUPPLY

Gas-fired hicon/n2 high convection bell annealer facility, type hog 430/250

st-n2-d, to anneal steel wire coils in straight nitrogen atmosphere. The

facility consists of the following main parts:

(2) HEATING BELL WITH GAS FIRING

Welded steel plate shell reinforced with steel sections, and with

reinforced roof for shifting by crane
Guide arms for positioning bell accurately
Sealing element around the rim of the heating bell to seal off the heating

chamber

Heating system, consisting of:
- high-velocity gas-fired burners
- fuel gas and combustion air supply lines,
- shut-off and control valves,
- electric ignition system,
- burner control system
- recuperator with thermal insulation plus ductwork and expansion joints to

preheat combustion air stack gas vented above roof)
- combustion air blower
- fuel gas metering system

Automatic couplings for fuel gas, control medium
Manual couplings for electricity and control lines

(3) HIGH-CONVECTION WORKBASE

- Sturdy base frame welded up from steel sections and plates
- Water-cooled seal element to provide hermetic seal when inner cover is

placed on workbase
- Heat-resistant high-capacity atmosphere recirculation fan, including

bearings and variable frequency drive controlled motor (water- cooled) with

thermistors
- Hydraulic clamping elements to secure inner cover, plus hydraulic lines

and valve block
- Guide posts to ensure exact positioning of heating bell, cooling bell

and inner cover
- Automatic couplings for fuel gas, control medium, manual couplings for

electricity and control lines

(3) VALVE STANDS

To supply utilities to workbases

- Welded steel section frame plus piping for the components listed
- Components for atmosphere, such as ball valves, solenoid valves, automatic

shut-off valves, differential pressure transmitters, turbine-type inferential

meters, flowmeters, pressure switches, furnace pressure transmitters and

connection point for atmosphere sampling
- Water components such as shut-off valves, control valve, safety valve,

flowrate supervisor and coupling
- Workload space pressure control with pressure transmitter, ball valve

with actuator, etc.
- CO2 control valve with electronic supervision

(3) INNER COVERS

- Heat-resistant alloy steel plate cover (material code 1.4828), gas

tight welded, with concave corrugations
- Cylindrical baffle suspended inside inner cover
- Water-cooled sealing flange to fit onto workbase gas-tight
- Guide arms for positioning bell accurately
- Lifting lugs for crane attachment

(1) COOLING BELL

- Steel sheet structure reinforced with steel sections, with reinforced

roof for lifting by crane
- Electric blowers at top of bell
- Guide arms for positioning bell accurately
- Manual coupling for electrical power line

(1) HYDRAULIC POWER UNIT
To supply the inner cover clamping mechanism

- Motor and pressure compensated axial piston pump (mechanically

adjustable for infinitely variable displacement) mounted on fluid reservoir

ELECTRICAL EQUIPMENT

- Power panels

CONTROL PANELS, CONTROL STATIONS

All PLC components required for controlling and supervising the entire

facility are installed in the control panels.

CENTRAL OPERATING SYSTEM/COS

The central operating system (COS) is provided for supervising and controlling

the whole facility. All relevant process data are read in from the PLC's via

a fast bus system and prepared for visualization, archiving and logging.

HARDWARE REQUIRED

- Central operating system
1 x personal computer: intel pentium 4, 512mb ram
1 x color ink jet printer
1 x modem
1 x ups - uninterruptable power supply

1 PC CABINET FOR CENTRAL OPERATING SYSTEM (COS)

Software
-operating system: All software runs under the 32 bit MS Windows XP

operating system.

(1) N2 ATMOSPHERE PRESSURE REDUCTION STATION

(1) CRANE ATTACHMENT
For shifting inner cover

- Welded 3-arm section steel frame with lifting eye for crane hook
- 3 load chains with hooks for attaching to inner cover flange

(3) CO2 MEASURING AND RECORDING SYSTEM
For automatically monitoring 1 sampling point

(1) COIL CARRIER TIPPER
A coil tipper is used to tilt the wire coils, charged on coil carriers,

from horizontal axis to vertical axis and back again.

- Load capacity: max. 6 t
- Outside diameter of coil carrier base plate: 1,400 mm
- Max. Height of coil carriers: 2,550 mm

This machine is listed for sale by National Machinery Exchange Inc located in Newark, New Jersey