Energy Optimizing Furnace Feb19

Energy Optimizing Furnace...

Energy Optimizing Furnace Energy optimizing furnace (EOF) is a primary steel making furnace. This process was developed by the mini steelworks pioneer Willy Korf along with his colleagues. This process is presently being operated in India at JSW SISCOL plant and at Hospet Steel plant of Mukand. The first unit went into production in1982. Process EOF is a melting/refining furnace for the production of liquid steel. It is having a scrap preheater.  The basic principle consists of working with combined submerged and atmosphere oxygen blown in an initial charge containing hot metal, preheated solid scrap and fluxes for slag formation. Scrap is preheated to around 850 deg C by the sensible heat in the off gas in one or two chambers located above the furnace roof. Blown submerged oxygen reacts with the carbon from hot metal and generates CO bubbles that travel through the liquid bath to the furnace atmosphere. Here CO is burnt to CO2 by the oxygen blown through atmospheric injectors and supersonic lances. The bubbling of CO generates a very strong stirring and increases greatly the bath surface. This allows transfer of a good amount of heat to the bath. The process also constitutes deslagging and formation of the secondary slag. The process has possibility of using high percentage of solid charge (even greater than 40 %). The process owes its thermal efficiency due to the following factors: i)             Chemical energy released due to the exothermic reactions between the injected oxygen and the various elements in the bath including added carbon. ii)           Chemical energy released from the gaseous oxidation reactions in the furnace atmosphere involving CO and H2 released from the bath. iii)          Sensible heat transferred by the hot gases from the furnace to the cold scrap charged into the pre...