Patent ID: 7767136
Filing Date: 2010-08-03
Classification: C21C,F27B,F27D,Y02P,Y10S

Abstract:
1. Apparatus for the combustion of gas exiting from an electric arc furnace for the preheating of scraps entering the furnace itself, comprising a preheating chamber or loading tunnel of the scrap metal having in sequence an insertion section of the scrap metal, a seal section to prevent an uncontrolled entrance of air in the loading tunnel, a heating section and an unloading section for scrap metal in the furnace, and being associated to a smoke outlet duct, wherein said apparatus is provided with an insertion device of a comburent substance into said preheating chamber or loading tunnel and comprises a centralised control system, an O 2 or CO probe, which is located in or close to said smoke outlet duct, and a mechanical seal device or a series of mechanical seal devices placed in the insertion section of the scrap metal in the loading tunnel or preheating chamber, and wherein said insertion device of the comburent substance comprises one or more adjustable openings which are placed on the roof of said preheating chamber or loading tunnel at said unloading section of the scrap metal in the furnace and which are connected to the centralised control system, which centralised control system acquires a signal from said O 2 or CO probe, computes the required comburent air in proportion to said signal and governs the variable opening of said adjustable openings accordingly.