Spray-cooled-roof systems for electric arc furnace.

Water-cooled-panels for electric arc furnaces have been very popular with the spread of the ultra-high-powered operation. These panels, however, have the problem that cooling water pours in furnace through the hole caused by thermal fatigue and thermal overload. To improve the water-cooled-panels, the spray-cooled-roof system has been developed by Ucar Carbon Co., Inc. This system is characterized by that water spray hits the roof panel and the sprayed water is drained by Venturi pump to maintain the atmospheric pressure in the roof structure.Daido Steel has introduced this technology and conducted the test operation using the 70 tons electric arc furnace in Chita plant. As a results, it is expected the elongation of the service life, the improvement of operational rate, safer operation and the decrease in maintenance costs. Based on these test results, this system will be applied to the commercial production line in Japan.