Metallurgical production enterprise is not only closely related to temperature, but also a comprehensive enterprise. In addition to normal special metallurgical equipment, such as metallurgical furnace, there are auxiliary equipment such as electric power, electrical appliances and raw material chemical industry. Once these key equipment breaks down, not only the economic loss is huge, but also easy to cause personal injury. Therefore, it is of great significance to detect the equipment by infrared imaging technology, understand and master the status of the equipment in the process of use, to find out the problems as soon as possible, to ensure the safe production and operation, and to extend the service life of the equipment.
In metallurgical industry, infrared diagnosis technology is usually used in the following aspects:
1. Through the condition monitoring, arrange the overhaul reasonably and improve the service life of the equipment;
2. Reduce heat loss and save energy;
3. Through the analysis of thermal image, the existing process is improved.
1、 Detection and diagnosis of defects in water wall of blast furnace lining
Some thermal imagers can be used to detect the surface of blast furnace and analyze the temperature distribution of the obtained thermal images. If there is no cooler, the lining defects can be directly judged by the different changes of furnace surface temperature. If the specific temperature of a certain part continues to rise, it can be considered that the furnace lining has been damaged and eroded; for the part with cooler, the surface temperature distribution can be analyzed according to the heat map, and the position with relative temperature rise can be found out to judge the damage of cooling wall or furnace lining defect.
2、 Diagnosis of blast furnace lump
It is a direct and quick method to detect the blast furnace lump by infrared thermography. First of all, the detection surface is divided into areas for detection, and the temperature distribution of each small piece of furnace skin is recorded. By comprehensive analysis of the low-temperature areas of each layer, the nodulation and the location of the nodules can be preliminarily diagnosed.
3、 Hot blast stove
Using infrared thermal imager to detect the hot blast stove is generally divided into two parts, one is the furnace body, the other is the furnace top, and pay attention to the detection of the joint between the ball top and the column body. The diagnosis will be very simple. The high temperature and overheating part in the thermal map is the defect corresponding to the refractory lining. Spot welding machine for aluminum plate
4、 Ladle, ladle
The infrared thermal imager can also be used to take thermal images to diagnose the corrosion degree of ladle and hot metal lining, and the state in the baking process to seek reasonable heating rate and baking time.
5、 Converter
The structure of converter has only furnace skin and lining, but no cooling part. By analyzing the surface temperature of the converter surface, the erosion damage degree of the converter lining can be judged directly.
6、 Rotary kiln
The kiln body of rotary kiln is detected by infrared thermal imager. According to the abnormal part of high temperature on the thermal image, the defects in the lining of the high temperature corresponding part can be diagnosed immediately. The higher the temperature is, the more serious the corresponding defects are.
In addition, the metallurgical industry can also use thermal imager to detect the connection points of electrical equipment in the plant, such as transformers, switch contacts in substation rooms and cables; detect a large number of mechanical transmission devices, fan motor bearings; measure the steel core temperature and verify the ingot liquid rate, so as to reduce the consumption of energy and materials and improve the quality of steel ingots.
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