PJSC Magnitogorsk Iron and Steel Works has completed the reconstruction of gas-purifying plants at the mill’s electric-furnace melting shop with CAPEX of more than RUB 1.3 billion. The gas purifying plants are now almost 100% efficient.
Over the course of the project, two old wet gas-purification systems, No. 32 and No. 33, were replaced with modern dry gas-purifiers. The new equipment is designed for catching, cooling and cleaning gas fumes that have formed as a result of work in the two-bath steelmaking unit (DSPA-32), as well as unregulated emissions which do not currently enter the gas exhaust pipe.
DSPA-32’s gas purification system consists of three two-modular tubular filters from a new original design with 20 filter sections on each filter and a horizontal arrangement of dust-collecting sleeves; five DR-28 smoke exhausters (four operational and one reserve) with a capacity of clearing 530,000 cubic meters per hour and engine power of 1MW each; compressor stations for the purpose of regenerating; dust collection systems with dust-free systems for loading dust into vehicles; a compressor station for supplying compressed air to regenerate the tubular filters, and electrical substations and a system of combined input and extract ventilation. The total volume of the area cleaned by the gas purifiers will be 1.32 million cubic meters per hour.
The complex for cleaning emissions from intra-furnace metal processing plants will include: a tubular filter module with 16 filter sections of similar design; two DR-22.4 smoke exhausters with a clearing capacity of 330,000 cubic meters per hour and an engine capacity of 1MW each, and a compressor system with dust-free systems for loading dust into vehicles. The diameter of the gas-pipe supply will be 25 meters. The volume of gas purified will be 214,000 cubic meters per hour.
All these systems are provided with ways of controlling the units’ operation and the automation of the technological process. The gas purifying plants are currently 99% efficient and the residual dust content is only up to 20 mg/cubic nm. The systems will reduce dust emissions by 1,800 tons a year.
The contract equipment for the reconstruction of the gas purification works was supplied by LLC “PO Ecotech”. The general contractor was OJSC “Prokatmontage” and the general designer, OJSC “Magnitogorsk Gipromez”. (MMK/Ukrainian metal)
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