GAS CURTAIN VENTILATION CONTROL FOR OPEN HOODED FERROALLOY FURNACE

摘要

An open electric smelting furnace system including an open top electric furnace, a hood above the furnace pot for collecting gaseous furnace products containing entrained solid particles and induced air derived from the atmosphere surrounding the furnace and admitted through the unobstructed access zone above the furnace, a solid particle collection system of limited volumetric capacity connected to the collecting hood, for cleaning the gaseous products prior to discharge into atmosphere, and means for projecting a curtain of gas partially across the unobstructed access area between the furnace pot top and hood to thereby minimize the volume of air induced into the hood from surrounding atmosphere to an amount sufficient to effect substantially complete combustion while simultaneously maintaining the flow and temperature at the collecting system below preselected limits and maintaining the volumetric flow below the allowable limit.