Turnkey Project

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70/85 ton AOD Converter System
with soft blowing top lance and alloy additions system

On August 9, 1998, a 70/85 nominal ton AOD converter system poured its first heat at Atlas Specialty Steels, Welland, Ontario, Canada. The system is based upon Praxair's Argon Oxygen Decarburization (AOD) process for the production of high quality stainless steel, superior castings, low alloy or specialty steels.

This turnkey project carried out by Whiting Equipment Canada Inc. proves the high degree of flexibility of the process and its success in meeting the high quality standards set out by Atlas Specialty Steels.

Technical Specifications of the Installation

CONVERTER

Number of Vessels Supplied: three (3) - figure 1

  • Nominal Capacity: 70 tons
  • Capacity Range: 55 tons to 85 tons
  • Inner Diameter: 14'-0"
  • Vessel Height (including cover): 20'-4 3/8 "
  • Vessel Weight Excluding Lining: 75,900 lbs.
  • Tilting Drive: two (2) 52.5 hp dc mill motors
  • Two (2) nitrogen driven backup motors
  • Rotational Speed: zero to 1 rpm variable
  • Number of Tuyeres: five (5)
  • Trunnion Bearing Center Distance: 19'-7 ½" - figure 2

MOTORIZED OPERATOR'S PLATFORM

  • Function: a chemistry, temperature samples and preheating platform
  • Drive System: 5 hp dc
  • Dimensions: 27'-0" high x 16'-0" wide x 26'-0" long (approximate)

OXYGEN LANCE

  • Function: rapid decarburization
  • Cooling: water
  • Movement: horizontal 21' -0"; vertical 9'-0"
  • Hoist Drive: 20 hp

MOTORIZED FUME HOOD

  • Function: capture process fumes
  • Cooling: refractory lined, air cooled
  • Drive: 10 hp
  • Movement: horizontal 21'-0"
  • Capture Mode: an accelerator stack projected to the canopy roof

PREHEATERS

  • Function: preheat AOD vessel and ladle linings
  • Quantity: three (3)
  • Capacity: one (1) vertical ladle preheater, 7 x 106 Btu/h
  • One (1) horizontal AOD operating vessel preheater, 10 x 106 Btu/h
  • One (1) vertical AOD standby vessel preheater, 10 x 106 Btu/h

VALVE RACK AND GAS CONTROL SYSTEM

  • Function: perform process gas control
  • Supplier: Praxair "IRS" (Intelligent Refining System)

TRANSFER CARS

  • Function: move process slag pots and ladles
  • Quantity: two (2)
  • Capacity: ladle transfer car - 160 tons, 10 hp dc, 35 ft/min
  • Slag pot car - 50 tons, 5 hp dc, 30 ft/min

IMMERSION SAMPLER

  • Function: remote robotic temp./chem. samples at ladle post treatment station
  • Quantity: one (1)

ALLOY ADDITIONS SYSTEM

Function: delivery of accurately weighed alloy additions to the AOD vessel while operating, using full automation

Bin Quantity: twenty-two (22), one (1) operating floor hand additions weigh hopper

Overall Dimensions: 39'-0" high x 26'-9" wide x 80'-0" long (approximate)

 

MISCELLANEOUS AUXILIARY EQUIPMENT

  • Installation of a 50 ton service crane • 5 ton jib service crane 
  • Melt shop building expansion
  • Ladle post treatment station
  • Cooling water system
  • AOD vessel bricking platforms
  • Vessel lifting beams
  • Training and commissioning programs

 

SYSTEM DESCRIPTION

The AOD plant had to be integrated into the existing melt shop, downstream of two (2) operating electric arc furnaces, a VAD all originally supplied by Whiting and a VOD. Pits were not allowed. All equipment had to be built on a mezzanine basis, 24 feet above the plant operating floor. This accounts for the unusual elevation of the tapper’s platform necessary to reach the vessel mouth area and the high piers needed to support the vessel. The tilt drive system is - helical gear, dual-input, single-output, double-quadruple reduction parallel shaft gear drive, connected through a gear coupling and driven by two (2) 52.5 hp dc mill motors. In addition, two (2) nitrogen motors were installed as a backup in case of power failure.  

 

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