Application of infrared thermal imager in metallurgical industry

Metallurgical production enterprises are not only closely related to temperature, but also systematic and comprehensive enterprises. In addition to normal special metallurgical equipment, such as metallurgical kilns, there are also auxiliary equipment such as electricity, electrical appliances and raw material chemicals. Once these key equipment fails, not only will the economic losses be huge, but it is also easy to cause personal injury. Therefore, using infrared imaging technology to detect the equipment, understand and master the status of the equipment use process, is of great significance for early detection of problems and causes, ensuring safe production operations and extending the service life of equipment.

In the metallurgical industry, infrared diagnostic technology is usually used in the following aspects:

1. Through status monitoring, reasonable arrangement of overhaul and increase of equipment life;
2. Reduce heat loss and save energy;
3. Improve existing processes through analysis of thermal images.

1. Detection and diagnosis of defects in the water-cooled wall of the blast furnace lining

Some thermal imagers can detect the surface of the blast furnace in blocks and analyze the temperature distribution of the obtained thermal images. For example, in areas where there is no cooler, the different changes in the furnace surface temperature can directly determine whether there are lining defects. If the temperature in the thermal image taken of a certain part continues to rise, it can be determined that the furnace lining has been damaged and corroded; for the parts where there are coolers, the surface temperature distribution can be analyzed based on the thermal image to find out the parts with relatively high temperature rise, and judge whether the cooling wall is damaged or the furnace lining is defective.

2. Diagnosis of blast furnace nodules

Infrared thermal imaging is a relatively direct and quick method for blast furnace nodules. First, the surface to be tested is divided into areas for testing, and the temperature distribution of each small piece of the furnace skin is recorded. By comprehensively analyzing the low-temperature areas of each layer, a preliminary diagnosis can be made as to whether nodules have formed and the location of nodules.

3. Hot blast furnaces

are tested using infrared thermal imagers. They are generally divided into two parts, one is the furnace body and the other is the furnace top. Attention should be paid to the intersection of the dome and the column. The diagnosis will become very simple. The high-temperature overheated area in the thermal image corresponds to the defect of the refractory lining.

Fourth, the steel ladle and the iron ladle

can also use the infrared thermal imager to take thermal images to diagnose the corrosion degree of the lining of the steel ladle and the iron ladle, as well as the state during the baking process to seek a reasonable heating rate and baking time.

Fifth,

the converter structure only has a furnace skin and a furnace lining, and there is no cooling part. After taking a thermal image of the converter skin with an infrared thermal imager, by analyzing its surface temperature, the degree of erosion and damage of the furnace lining can be directly determined.

Sixth, the rotary kiln

uses an infrared thermal imager to detect the rotary kiln body. According to the abnormal high temperature part on the thermal image, it can be immediately diagnosed that the lining of the corresponding part of the high temperature has defects. The higher the temperature, the more serious the corresponding defect.

In addition, the metallurgical industry can also use thermal imagers to detect electrical equipment in the factory, such as transformers, substation switch contacts and cables and other electrical equipment connection points; to detect a large number of mechanical transmission devices and fan motor bearings; to measure the steel core temperature and verify the liquid rate of the steel ingot, reduce energy and material consumption, and improve the quality of the steel ingot. (end)