Emisshield® was applied to the roof of the furnace in order to improve substrate life and reduce hot spots. Under normal conditions, the roof on this Electric Arc Furnace starts to “heave” and cracking appears on the outer surface. Hot spots occur on the outer surface ranging from 300°F (150°C) to 600°F (315°C).
An optical pyrometer was used to measure surface skin temperatures of the roof and there were no hot spots. Instead, a uniform temperature of 300°F (150°C) was found due to the re-radiation of energy by Emisshield®. Cracking in the roof did not start until the sixth week. The furnace continued to run for a total of eight weeks before it was scheduled to come down because of this cracking.
Emisshield® almost doubled the life of the Kala Brick in this furnace. This will not only save its operator material and labor costs, but will also have a positive impact on productivity, since a roof replacement puts the furnace out of service for four days.
Furnace Type: Electro Melt 9PT: 1,000,000 watts
Heating Source: Electric Imbedded Resistance Heating
Substrate: Kala Brick
Operating Temp: 2400°F (1316°C)