Apparatus and process system for preheating of steel scrap for melting metallurgical furnaces with concurrent flow of scrap and heating gases

Abstract From the Canadian patent

The invention provides a novel preheating apparatus and method for preheating a ferrous scrap mixture prior to feeding the scrap into a metallurgical furnance primarily using heat recovered from hot waste gases emitted from the furnace exhaust port and simultaneously reducing contaminants from the scrap and from the waste gases with concurrent downward flow of hot waste gases and downwardly descending scrap. The apparatus has a chamber including a top compartment with a cold scrap input for depositing cold scrap into the top compartment and a hot waste gas inlet in flow communication with the furnace exhaust port. The chamber also has a bottom compartment with a heated scrap discharging …