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THE ALTERNATIVE ENERGY TECHNOLOGY

·       If the operating practice is managed and maintained in a proper way, the operating costs will be reduced, e.g. lower electrodes consumption, refractory costs and energies etc…

·         If a procedure specifically required by a type of process is not entirely applied with an appropriate method, the result will be negative.

 

 

 

 

·         Alternative energy contributes significantly to the final energetic balance for the steel production.

·         Oxygen is essential for the optimization of the process.

The typical application includes:

Scrap cutting and melting process by means of burners mounted onto the wall, carburization, decarburization and the formation of foamy slag by means of injection systems in the door or in the wall.

·         In recent years many developments have been realized in order to satisfy this requirement to such an extent that it is common to find various types of devices in the same EAF (roof lance, door lance, burners on the wall, burners in the door etc.)

 

Melting Phase

The melting phase of the iron scrap is obtained by mixing the oxygen and natural gas with a composition to reach an ideal constant flame as well as an acceptable noise level. In this way the generated flame has a high kinetic energy to assure an even sliding and uniform melting down of the iron scrap.

 

 

Decarburisation

The decarburisation phase necessitate the oxygen injection into the liquid bath at a high speed to oxidize the impurities and to reduce the carbon content in order to obtain the desired gradient. In order to render such a process of the decarburisation efficiently, the oxygen must be injected at an angle of 40-45° into the liquid bath with a speed above Mach 1.5.

 

Carburisation

The carburisation phase demands the injection of the carbon with a speed of approximately 50 m/sec to ensure to penetrate the slag and to enter into the liquid bath. This can be obtained by using specific nozzles.The slag formation phase of the foamy slag and the immersion of the electrical arc into the foam increases,the thermal exchange between the arc and fused parts because the heat losses are reduced towards the other elements.

Spilling

In many cases the spilling phase increases the "power-on" time for the iron scrap not yet fused. For this reason one or two injection points are installed at the EBT in order to have uniform liquid steel and temperature increasing especially in that area.

Cooling Technology

 The cooling technology applied in EAF overheated critical parts results in a reduced refractory, metallic and castings wear as well as in an increased production and a longer operation life. Since early 2005 SMM has developed this technology in EAF for electrode holder, cooling box, cooling block and lance head.Today SMM offer the most up-to-date generation of cooling blocks, Teknobox and Teknosphera, which have been entirely engineered and designed to satisfy the last state-of-the-art in steel processes.

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