3-2. Aluminium Melting and Holding A high efficiency, a low oxidizacion ofmecal, a quick melcing, a low invescmenc cosc, a simple operacion were at scake when new furnaces had co be designed. *The "RAPID MELTING FURNACE" depicced in figure 4, is a combinacion of a dry hearch melcing furnace and a holding furnace associaced wich an exchanger preheacing ehe combuscion air wich ehe flue gases and a charge preheacing. The preheaced mecal is molcen wich an " opposice swirls burner". As soon as it is molcen, İt flows chrough aport' co a second furnace where irs cemperacure is increased and held co irs pouring value wich radianc flac flame burners, chus prevencing mecal losses by oxidizacion. Charge Gas Melting Jet Burners DDGAL GAZ DERGiSİ SAY!. 29 99 The flue gases from both melting and holding zones flow chrough ebe charge, eben flow chrough an exchanger. The specific consumpcion of ehe whole furnace is around 600 kWh (NCV)/ ton. Available furnaces range from 0.6 co 3 mecric cons. *The "DRY-HEARTH / CHARGE -PREHEATING FURNACE" wich a specific consumpcion around 600-650 kwh (NCV)/t and a burnc metal loss becween 1 . 1 and 0.6 %, chis furnace, described on figure 5, has a combuscion efficiency of 60 %. It is a dry hearth "stack" melting furnace followed by a holding tank. Jet burners at ehe boccom of ehe scack complece ehe melcing begun by ehe flue gases from ehe furnace. Mastering ehe pressure inside ehe furnace (wich a pressure Flue Gases Preheating Stack Holding Burner Cleansing Door Liquid Metal Drawing Flg.5
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