Shigang Company Engineering Project

This project is a core environmental protection supporting project for the short-process steelmaking in the new area of ​​Shigang. The two Siemens VAI twin-shaft direct current electric arc furnaces introduced in this project produce flue gas containing dust, dioxins, and other pollutants during the scrap steel preheating and melting process. The flue gas conditions fluctuate significantly with changes in scrap steel preheating temperature, and the system needs to simultaneously consider waste heat utilization and synergistic pollutant control. Conventional dust removal equipment is difficult to adapt to these complex requirements.

A comprehensive flue gas collection mode of "twin-shaft + enclosed hood + roof hood" is adopted to ensure that there is no flue gas escape from all points of the electric furnace smelting, tapping, and slag removal processes. This is followed by a combined process of "combustion sedimentation + flue gas rapid cooling + activated carbon adsorption + bag filter dust removal." First, large particulate dust is initially removed through combustion sedimentation; the flue gas rapid cooling stage inhibits dioxin regeneration; activated carbon adsorption removes harmful gases; and finally, a bag filter precisely captures fine dust and adsorption byproducts.

This process results in particulate matter emission concentrations far superior to ultra-low emission standards, reducing particulate matter emissions by 50% compared to other types of electric furnaces, reaching 5 mg/m³. Dioxin content is reduced by 80%, while also helping to increase the scrap steel preheating temperature to around 600℃, balancing environmental protection and energy saving efficiency. This provides a benchmark solution for dust removal in domestic short-process electric furnaces.