Technical and economic indicators, energy technological criterion of ferro-alloy electric furnace work

Such a negative phenomenon as an increasing gap between the active power in the electric furnace bath and the installed power of the transformer is observed with increasing power of ferroalloy furnaces. This does not allow achieving high technical and economic indicators, limits the productivity of the furnaces and their efficiency. A complex parameter - the energotechnological criterion for a ferroalloy electric furnace was used to evaluate the operation of ferroalloy units as powerful consumers of electricity. The aim of this work was to identify the relationships between the energy-technological criterion for the ferroalloy electric furnace operation and technical-economic indicators, such as specific energy consumption, workshop cost of the alloy and the productivity of the electric furnace for smelting ferrosilicon and carbon ferrochrome. It is shown that smelting of 75 % ferrosilicon is a good level of work for medium-power furnaces. It corresponds to a range of energotechnological criteria from 0.300 to 0.314, in which the specific energy consumption is from 9.0 to 8.6 MW∙h/t of alloy. Accordingly, the energotechnological range criterion is from 0.304 to 0.326 for carbon ferrochrome, in which the specific energy consumption is in the region from 3.6 to 3.4 MW∙h/t of alloy. It was found that an increase in the energy technology criterion corresponds to a decrease in the specific energy consumption and workshop cost of 1 ton of the obtained ferroalloy based on the obtained dependences. It also increases the specific productivity of the furnace (t/day) by 1 MV∙A of the transformer capacity, both for slag-free and for slag smelting processes in electric furnaces.