Process for preheating scrap iron and iron or steel scrap

摘要

Process for preheating scrap iron and iron or steel scrap of the kind of those in which the postcombustion chamber 2 communicates via a first duct 5 with the preheating enclosure 3 and via a second duct 6 with the dust removal circuit 7 via the intermediacy of a valve 8 and of the kind of those comprising a circulation pump 9 in the said first duct 5, the outlet of which is connected to two ducts 10-11 which can divert the fumes towards the chamber 2 or towards the dust removal circuit 7 by passing through the valves 12-13 controlled by a control system 14 sensitive to the temperature of the fumes at the exit of the postcombustion chamber 2. An instrument allowing the pressure inside the furnace 1 to be maintained at its optimum value is inserted in the duct 5, the said instrument being servo-controlled by a control system 16 sensitive to the pressure prevailing in the said furnace. <IMAGE>