The Application of Infrared Thermal Imager in Steel Industry

Infrared thermal imaging cameras are used for non-contact real-time monitoring of temperature, can accurately quantify the detected heat, and accurately identify and strictly analyze the monitored area. Infrared thermal imaging cameras can be used in every link from smelting to steel rolling. Through non-contact infrared thermal imaging temperature measurement technology, it can realize rapid, real-time and accurate temperature monitoring and control of the entire production process of iron and steel metallurgy, and escort the safe production of iron and steel metallurgical enterprises.


Infrared Thermal Imager, Steel Industry


1. Stack fire monitoring

It is difficult to monitor the large stockpiling area, the cost of manual inspection is high, and the judgment of danger warning is delayed. Using the infrared thermal imager, the internal temperature of the coal pile can be monitored in a large range from a long distance, and the heating status of the coal pile can be understood in time so that measures can be taken early to avoid the spontaneous combustion of the coal pile.


2. Coking and sintering process monitoring

The coking and sintering process is judged by manual experience, the quality standards are not uniform, the high-temperature environment has a low level of personnel protection and safety, and there is no process data monitoring and management. The use of infrared thermal imaging cameras to monitor the status of the tail in real time greatly guarantees the quality and quality of the minerals during the sintering process.

It can display the temperature change of the section in real time, and scientifically calculate the temperature field and uniformity of the section. Through remote platform operation, labour costs are saved, hidden danger alarms are pushed in time, and risks are controllable.

3. Steam pipeline leakage monitoring

It is difficult to locate and judge the leakage of steam pipelines, and the traditional temperature measurement is inefficient and not intuitive. The infrared thermal imager can easily take a clear contrast image of visible light and infrared, intuitively locate abnormal problems, high efficiency and fast detection.


4. Determination of charge level of large blast furnace

Modern ironmaking blast furnaces require uniform distribution of raw materials added to the furnace, and the distribution of raw materials can be measured from the distribution of furnace top surface temperature. Use a thermal imager to measure the temperature of the material surface in the furnace through the silicon glass port installed on the top furnace shell of the blast furnace. After image processing, the computer controls the action of the feeding equipment to adjust the flow of raw materials to make the distribution of the furnace material reasonable and reduce coke.

For example, China’s Baosteel No. 1 blast furnace uses an infrared thermal imaging camera to collect, calculate, and display the material surface temperature in real-time, which plays an important role in determining the quantitative delivery of raw materials, providing pig iron production and quality, extending furnace life, and saving energy and reducing consumption.


5. Damage diagnosis and repair of hot blast stove

The furnace lining of the hot blast stove is easy to be burned during production, but because the furnace is closed, the burnt position is not easy to find. The use of a thermal imager can diagnose the damaged location of the furnace and carry out maintenance in time, which greatly prolongs the service life of the hot blast stove.


Infrared Thermal Imager


6. Determination of the location of the blast furnace residual iron hole

Before the overhaul of the blast furnace, it is necessary to open an opening in the furnace to remove all the residual iron in the furnace. In the past, the position of the opening was determined by experience, which was often inaccurate, resulting in the exhaustion of residual iron, which made it difficult to dismantle the furnace. During the overhaul of the blast furnace, the temperature of the furnace shell was measured with a thermal imager, and the inflexion point was measured under the dead iron layer. It took only 25 minutes to determine the position of the lower surface of the residual molten iron and the position of the opening. After the opening, all the residual iron was drained.


7. Defect detection of steel ladle and ladle lining

When the tank runs to a certain period, it needs to go to the maintenance workshop for maintenance. Very experienced staff are required to judge the condition of the ladle lining, judge whether the ladle needs to be repaired and the remaining number of uses, and use the infrared thermal imager to use visual recognition, Infrared temperature measurement and other technologies, systematically analyze the temperature changes of the container brick lining and steel shell, timely find out the weak points of turning, peeling and lining, and give early warning to avoid the occurrence of vicious accidents.


8. Determination of ingot temperature

The temperature of the steel ingot poured in the steelmaking plant before entering the soaking furnace is very important. The thermal imager is used to measure the surface temperature of the steel ingot before entering the furnace, so that the heating of the steel ingot by the soaking furnace can be optimized, and the gas consumption can be saved.


9. Measurement of steel mould temperature

In order to improve the service life of the ingot mould and reduce consumption, it is necessary to measure the change law of the surface temperature field of the ingot mould under the hot working state. Measure the change of the surface temperature field of the steel mould from pouring to demolding, obtain the change law of the temperature field, the maximum temperature of the ingot mould, its position and duration, etc., and use these data to successfully design a high-quality steel mould.


10. Measurement and control of the temperature of the slab out of the furnace

The slab to be rolled from the heating furnace requires uniform temperature distribution. Anshan Iron and Steel Medium Plate Plant measured the temperature of the slab out of the furnace with an infrared thermal imager and found that the temperature in the width direction of the furnace was not uniform, and also found “black marks” on the slab. Based on this, the cause was analyzed, and corresponding measures were taken to eliminate these slabs. problems, thereby ensuring the quality of the board.


11. Determination of surface temperature of hot roll

Hot rolls work at high temperatures for a long time, and thermal fatigue cracks are prone to occur, which is related to the temperature distribution and change of the roll surface. Using a thermal imager to measure, it is found that the temperature distribution on the surface of the roll is uneven, which is related to factors such as the uneven distribution of the cooling water of the roll and the uneven temperature of the billet during production. Therefore, corresponding measures have been taken to reduce or eliminate thermal cracks.

An infrared thermal imager is a key tool for detecting, controlling and optimizing iron and steel metallurgical production processes and equipment. It is widely used in the whole process of production and manufacturing to help the iron and steel metallurgy industry reduce costs, increase efficiency, and produce efficiently and safely.

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