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The dust collection system for the EAF unit consists of several coordinated components: the exhaust pipes, the roof ducts, the cyclone, the filter house, and the fan building. The fans in the fan building provide the necessary airflow and transport the exhaust gas stream through the individual purification stages. Three large fans are being installed; they are expected to operate around the clock in the future. They generate the suction power needed to transport the entire exhaust gas stream through the various purification stages.
What is currently most visible from the outside? Presumably the cladding on the roof ducts. In addition to its attractive appearance, this cladding serves an important technical function: multiple layers of insulation made of insulation wool and soundproofing material, as well as an outer sheet metal cladding, reduce noise levels.
Another essential component of the system is the so-called cyclone. It performs a crucial protective function within the exhaust system. The exhaust gases extracted from the electric arc furnace contain not only dust but also hot particles and sparks. In the final cyclone, these components are separated from the air stream by means of centrifugal force. This prevents downstream system components—especially the filters—from being damaged by the high temperatures or incandescent particles.
In the blue-clad filter house, dust particles and other components are removed from the air, so that only cleaned air is released into the environment via the stack. It constitutes the final purification stage of the exhaust system and functions, in principle, like an oversized vacuum cleaner. Inside are a total of 5,075 individual filters, which remove even the smallest dust particles from the airflow. In addition, an activated carbon injection system is used to bind and remove further undesirable components from the exhaust stream.
The separated dust is collected in a dust silo and can be picked up from there by truck as a recyclable material for further processing.
Only after the exhaust gases have passed through all cleaning stages is the purified air released into the environment. The combination of the final cyclone, filter housing, and fan building thus not only ensures safe plant operation, but also makes an important contribution to an environmentally friendly and efficient production process. With the current progress in installation, the exhaust system is gradually nearing completion.