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Using new technology to solve the defect of electric furnace refractory material

[vc_row][vc_column][vc_column_text]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:

  1. Perform 7×24 hours all-weather inspection on the bottom of the electric arc furnace;
  2. Real-time display of the thermal image and temperature data of the damage state of the refractory lining of the electric furnace bottom;
  3. Once the abnormal temperature is found, the alarm will be notified immediately and the staff will deal with it in time. (Picture 1)



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 remediate after disasters.

As a non-contact temperature measuring instrument, thermal imaging camera can quickly find the thermal defects of the object through imaging and analysis of the heat (temperature) distribution on the surface of the object. In the safe production of steel, thermal imaging cameras have the following typical applications:

Ladle refractory temperature

Detect the refractory material inside the ladle, which is corroded by high-temperature molten steel for a long time, and the thickness of the ladle wall becomes thinner, which is likely 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. (Figure II)


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 multiple erosions 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!

Torpedo tanker refractory temperature detection

Detect cracks, bulges, and shedding caused by chemical erosion, mechanical erosion, and rapid heat and cold on the inner lining of torpedo tankers. When the refractory material is locally damaged severely but not found, it will cause a serious accident. Use FOTRIC thermal imaging camera for preventive detection to avoid accidents. (Picture 3)


Blast furnace refractory temperature detection

The refractory material in the blast furnace falls off, and the hot molten iron in the furnace (about 1350°C) will leak directly to the water cooling system, insulation system, and furnace wall along the off part, which will seriously cause the entire blast furnace to be scrapped and even personnel safety. The partial thinning of the furnace lining will transfer the high temperature to the furnace wall through the water cooling system and the insulation system. Using FOTRIC thermal imaging camera to monitor the surface temperature of the furnace body can objectively reflect the degree of damage to the furnace lining. (Picture 4)


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. (Picture 5)


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. (Picture 6)


Fire protection monitoring of sintering conveyor belt

The sintered clinker is transported to the blast furnace through the conveyor belt. During the transportation, the sintered ore may not be cooled in place (the temperature is 80-100 ℃ after normal cooling). High-temperature sintered ore can easily ignite the belt during transportation, causing the entire ore transportation system to burn down and cause heavy losses. (Picture 7)

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As professional one-stop solution provider, LIAONING MINERAL & METALLURGY GROUP CO., LTD(LMM GROUP) Established in 2007, and focus on engineering research & design, production & delivery, technology transfer, installation & commissioning, construction & building, operation & management for iron, steel & metallurgical industries globally. 

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