Recently, in order to improve the environment surrounding steel-mill sites, electric arc furnace steelmaking melt-shops have been constructed to capture and contain the gases, dusts and other emissions generated within the workshop-buildings. This measure, however, has lead to the deterioration of the working atmosphere for the operators, and even with the installation of large-capacity dust collectors, sufficient results are not necessarily obtained. Problems have also developed in the direct evacuation systems, since the ductwork of the systems is often damaged by the high-caloric exhaust gas and corrosive components in the gas. In this discussion, the technologies developed by NKK to cope with these problems are examined.

arc furnace, arc furnace melt-shop, dedusting system, direct evacuation system, emission control system, dust loading, duct corrosion