Definition of aluminium scrap preheating requirements Sample Clauses

Definition of aluminium scrap preheating requirements. The motive behind preheating scrap aluminium is to reduce the melting time and thereby increase the energy efficiency. Besides, that step would remove moisture from the metal scrap before it is loaded into the melting furnace, an action that has to be executed to avoid explosions. The first concept of the pre-heating system proposed in REVaMP is based on two separate xxxxxxxx  WDF burner  Heat exchanger (to avoid direct contact between hot gases and scrap) Design constraints for the pre-heating system are o Dealing with WDF heterogeneity and chemical composition  NCV fluctuations  Risk of uncontrolled overheat of the WDF  Corrosion, slagging, fouling issues, that could affect the refractory, filters and heat exchanger system o Environment issues:  Air emissions: treatment of off-gases from burner  Residual waste (char, slag) hazardousness One important design consideration for the preheating system is the maximum temperature the metal load will reach. The maximum should be below the melting temperature so that metal pieces in the scrap are not led into plastic state. The selection of the temperature to pre-heat the scrap should be a compromise among several factors  Target reduction of melting time achievable in rotary furnace  Energy demand in scrap pre-heating (energy delivered by the WDF combustion) and pre-heating time. That would depend on calorific value and combustion kinetics of WDF, but also on aluminium scrap physical-chemical characteristics (Content of volatile impurities and moisture of scrap, alloy composition and physical form (shape, size) of scrap) and heat exchanger design.  Recovery of heat contained in WDF combustion gases, using convection pre-heaters, might be limited by maintaining low wall temperature, in order to control hot corrosion of equipment and, thus, the preheated combustion air provided by these heat exchangers may be at relatively low temperature (425-315 oC) (6). ___________________
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