Conventional System

The GEMKOM electric steelmaking technology is the solution for strong, simple and reliable design. As the product of continuous development improvements, our furnaces features maximized power-ontime, high-speed movements and easy access to all components for maintenance. The furnace is ideal for ultra-high-power input and overall furnace performance can be additionally enhanced with the latest oxygen and carbon injection technologies.

EAF from GEMKOM is the ideal melting unit for the production of all types of steel, from standard carbon grades up to high-alloyed and stainless steel grades. Its overall furnace performance can be additionally enhanced with the latest oxygen- and carbon-injection technologies.

The idea of GEMKOM for the choice of the various systems making up the plant is strictly related to the achievement of the following high-priority objectives, namely:

  •  Limited investment costs
  •  High quality products
  •  High productivity
  •  Maximum simplicity of operation
  •  Operation reliability
  •  Maximum flexibility to meet various market demands

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Starting point of steelmaking is the scrap yard. The complexity of minimill based steelmaking is coming from various types and blends of scraps and scrap substitutes such as DRI and HBI. To handle the complexity automatic operation shall be applied.

The energy required to meltdown and superheat the steel and slag including all losses are balanced by the energy input by means of electrical energy and exothermic reactions.

The cooling element (roof/pipe panel) is designed as a water-cooled, exchangeable panel and consists of pipes with several water circuits. The panel is sealed with a cover plate. The panel is provided with slag pins and gunned with refractory material in order to protect it against heat. All openings for offgases, material feeding, lime injection, furnace pressure measurement and the taphole filling system are led through the panel. The panel is supplied with water from the roof supporting structure (fixed piping).

  •  (EAF) design condiders always for short tap-to-tap times thanks to several technologies such as:
  • UHP (Ultra High Power) design, with high secondary voltages and longer arc
  •  High-current-conducting electrode arms in copper-clad box design
  •  State-of-the-art electrode control system
  •  Extensive use of alternative energy sources (chemical energy)
  •  Better energy and thermal balance inside the furnace thanks to the multiunit injection
  •  High yield of alloy additives and high ladle refractory life thanks to EBT slag-free tapping
  •  More heat input in cold EBT area thanks to special design of EBT-burner system
  •  Heavy construction design to sustain hard working conditions, allowing very fast movements and safe operations
  •  High flexibility and high efficiency of furnace operation with closed slag door application
  •  Easy maintenance operation for special design like roof lifting system, furnace locking system
  •  Split-shell design
  •  Copper or combi-panels with high-speed cooling water flow
  •  Continuous DRI/HBI feeding systems
  •  Additional chemical energy based on carbon, fuel and oxygen is used as substitute of electric power
  •  SIM-ARC electrode regulation design
  •  Hot heel practice
  •  Fast scrap charging
  •  Scrap yard flexibility

EAF also employs supplementary chemical energy to save electrical power and thereby reduces conversion cost through improved EAF productivity. Chemical energy is supplied through special design GEMKOM-Combined burner system providing carbon and oxygen injection. Burners are distributed for the aim to cancel cold spot areas and also to obtain good foamy slag. In other words, the configuration was selected in order to have an as homogenous as possible supply of chemical energy to the bath. The module philosophy follows the target of efficient management of electrical and chemical energy, combining efficient dynamic control of the electric arc with a balanced injection of oxygen and carbon in order to increase EAF productivity.