COST SAVINGS – INCREASED PRODUCTIVITY
The environmental requirements of steel mills have changed dramatically in recent years. Due to increasing pollution controls by federal, state and local authorities, no new electric arc furnace is installed without complete fume control equipment which has to last as long as possible.
The direct exhaust control system, combined with a hood, is currently state of the art.
The use of high power electric furnaces and various melting techniques involving foaming slag, coal injection and additional alloys. A high amount of oxygen contributes significantly to the selection of the capture device and the determination of the final exhaust gas volume.
The intensive use of oxygen, burner installations and smelting practice require an exhaust gas system that must meet the overall requirements of economical steel production. Maintenance in this area should be kept to a minimum.
The system consists of a fume cooling vault and a water-cooled fume inlet duct, as well as a sliding sleeve to adjust the gap between the furnace elbow and the fixed duct in order to maintain the required amount of inlet for CO post-combustion.
At ground level, a combustion chamber combined with a bypass box is installed on a separate concrete substructure. The size of the chamber should be determined by the volume of flue gas and the particular local conditions. A water-cooled door at the front allows easy access for maintenance to remove accumulated deposits. Depending on the gas temperature at the inlet of the uncooled duct, the diameter and total length of the water-cooled duct should be calculated with optimised gas velocities to avoid deposits in the duct.
