When the electric furnace gas discharges to form an arc, the energy is very concentrated, and the arc zone temperature is above 3000 ℃. For electric arc steelmaking furnaces, the bottom and walls of the furnace are built with alkaline or acidic refractory materials.
During the steelmaking process, the working layer of the inner lining of the electric arc furnace is in direct contact with molten steel, and the damage and peeling of the inner lining of the electric arc furnace will lead to leakage of the electric arc furnace, which will cause major economic losses and production and personal safety accidents to the steelmaking plant.
Install an online thermal imaging camera at a suitable location for each electric arc furnace:
- Perform 7×24 hours all-weather inspection on the bottom of the electric arc furnace, and the highest temperature can be measured at 2000 ℃;
- Real-time display of the thermal image and temperature data of the damage state of the refractory lining of the electric furnace bottom;
- Once the abnormal temperature is found, the alarm will be notified immediately and the staff will deal with it in time.
The purpose of real-time monitoring by thermal imaging cameras is to detect defects in electric furnace refractory materials as early as possible to prevent accidents, not to remedy them after disasters.
As a non-contact temperature measuring instrument, thermal imager can quickly discover the thermal defects of the object through imaging and analysis of the heat (temperature) distribution on the surface of the object. In the safety production of steel, thermal imaging cameras have the following typical applications:
Ladle refractory temperature detection
The refractory material inside the ladle is corroded by high-temperature molten steel for a long time, and the thickness of the ladle wall becomes thinner, which is easy to cause water leakage accidents through ladle. At the same time, the thinning of the ladle wall will cause the surface temperature of the ladle to rise, the greater the degree of thinning, the higher the surface temperature. Using FOTRIC thermal imaging camera to detect the surface temperature of the ladle, the thickness of the ladle wall can be reversed, and corresponding maintenance measures can be taken to prevent ladle wear.
Tundish refractory temperature detection
The tundish is the key container of the continuous casting system. With the increase in the number of times the tundish is used, the internal refractory material is easily damaged and dropped due to repeated erosion and corrosion. It is necessary to prevent high-temperature molten steel from penetrating the ladle. A bag wearing accident is a dynamic process, not a sudden occurrence. The use of FOTRIC thermal imaging camera can monitor the tundish in real time, and provide early warning through the thermal gradient change and temperature trend of the heat map!
Hot blast stove refractory temperature detection
Due to the arc shape of the hot blast stove, especially the dome, the heat-insulating refractory bricks are prone to cracks and fall off during production. In severe cases, the shell may burn through and cause safety accidents. The FOTRIC thermal imaging camera can quickly and accurately detect the damaged position of the vault lining, which is convenient for timely maintenance and safe production.
Converter refractory temperature detection
During long hours of work, the refractory inside the converter is gradually eroded and peeled off, and the steel plate is directly exposed to a high-temperature environment, softening or even melting, which is easy to cause the furnace bottom to burn through and cause furnace wear accidents. Because of the principle of heat conduction, the use of a FOTRIC thermal imaging camera to detect the surface temperature of the converter can determine the condition of the internal refractory materials and scientifically monitor the converter to prevent wear.