Severstal Completes Environmental Facilities at Blast Furnace 3
Russian steel giant Severstal has completed the construction of environmental facilities as part of the blast furnace No 3 reconstruction project. The
Russian steel giant Severstal has completed the construction of environmental facilities as part of the blast furnace No 3 reconstruction project. The reconstruction project provides for the maximum environmental friendliness of pig iron production along the entire process chain and sources using the best available technologies. The main object of the dust and gas collection system is the aspiration system and gas cleaning. The aspiration system provides for air purification from dust from workplaces and technological operations. Gas cleaning, in turn, provides cleaning of blast furnace gas. The main technological operations, during which the release of pollutants into the atmospheric air from the DP-3 complex, is the preparation and metering of charge materials, loading of the charge into blast furnaces, and the operation of the foundry. Through the shelters of places of dust and gas formation, the aspiration suction system with regulating and shut-off valves takes the polluted air and gas for cleaning.
The suction valves are controlled automatically. The process is organized from the places of discharge of cast iron and slag, a skimmer, side suction from the tap holes and umbrellas above the tap holes. Since the release of smelting products is carried out simultaneously from only one tap hole, suction from other tap holes is cut off. The operating mode of the valves is synchronized with the operating mode of the casting yard equipment.
To prevent emissions of pollutants into the atmosphere when loading material into the furnace through a non tasting charging device, suppression of emissions from the charging device with compressed nitrogen is provided, with the help of which dirty blast furnace gas is blown under the furnace top. Dust-laden air from the intake chamber of the bell less loader will be directed to the manifold of the new central exhaust station. Dust removal from the aspiration air will be carried out with bag filters. The filter consists of 1056 sleeves, 10 m each. The bag filters of the supplier are characterized by their compactness, a larger filtration area, so they can work effectively in confined spaces. Residual dust content in the air will be no more than 8 mg per cubic meter. The discharge will be carried out through an 80 meter high chimney. The total cost of the aspiration system project is RUB 850 million, which is 2.5% of the total cost of the DP-3 reconstruction project.