Many important equipment in metallurgical production is working under high temperature and high pressure, and there are some flammable and explosive risks lurking, which requires strict monitoring of the production process and timely elimination of dangers. Iron and steel smelting has the characteristics of high ambient temperature, large amount of dust, and frequent temperature detection. The equipment used in steel smelting is prone to a variety of problems such as wear, exhaustion, cracking, deformation, corrosion, peeling, leakage, blockage, loosening, melting, material deterioration, pollution and abnormal sensation, and most of these high-frequency faults are directly or indirectly related to temperature changes. The use of high-temperature thermal imaging cameras can detect product transmission and pipelines, refractory and thermal insulation materials, various reactors of corrosion, cracking, thinning, blockage and leakage and other related information, can quickly and accurately obtain the surface temperature distribution of equipment and materials, early agile and accurate detection of various abnormal conditions, to avoid accidents and reduce energy consumption is very useful.
1. Monitoring of damage to the lining of industrial furnaces.
The thermal imaging camera can usefully detect the damage of the lining material of the metallurgical heating furnace, and quickly and accurately evaluate the heat dissipation loss of the furnace body, so as to effectively avoid all kinds of incidents and complete the transformation of the regular overhaul criterion of the heating furnace to the expectant repair criterion.
2. Monitoring of large blast furnace material level.
Modern ironmaking blast furnaces require uniform distribution of materials in the furnace, and the use of high-temperature thermal imaging cameras can be controlled according to the temperature distribution of the material surface. When the temperature field of the material surface shows abnormal temperature points, it means that there is a "pipe phenomenon" in the furnace, and it needs to be eliminated by manipulating the cloth at this moment. The real-time display of the material surface temperature through the high-temperature thermal imaging camera plays an important role in determining the quantitative input of materials, supplying pig iron output value and quality, prolonging furnace age, and saving energy and reducing consumption.
3. Temperature monitoring of furnace slabs.
Infrared thermography is an ideal detection method to record the temperature change of billet after it is out of the furnace and throughout the rolling process. It is worth mentioning that because of the influence of iron oxide scale, the surface temperature measured by the general radiation thermometer is not the surface temperature of the actual billet, relatively speaking, the temperature of the iron sheet falling off after the billet is out of the furnace is closer to the surface temperature of the billet. The high-temperature thermal imaging camera was used to solve the problem that the temperature of the billet changed quickly after the furnace, which made the thermocouple test results inaccurate and even the bottom could not be measured. The selection of a point or a certain part of the measurement may not be representative, and the use of infrared thermal imaging skills to make up for the shortcomings of the above temperature measurement methods to a large extent.
Fourth, the analysis of molten steel slag.
In the process of tapping at the end of steelmaking, some highly oxidizing steel slags are easy to follow the molten steel, which brings damage such as phosphorus return to molten steel and increased inclusions, and reduces the precision rate. Traditional steel slag monitoring relies on visual observation, which is easy to form quality incidents. According to the different infrared emissivity of molten steel and slag, the infrared thermal imaging camera is used to detect the steel process in real time, which can accurately judge the time of separation of steel slag and molten steel, accurately judge the slag time and alarm, lift the furnace in time to return the converter to the vertical position, and finally test the accuracy of the alarm at the end of the steel tapping of the infrared slag detection and control system of the converter to reach 9907%, which eliminates the disadvantage of visual observation and detection of converter slag.
5. Monitoring of molten steel dumping.
In the process of dumping molten steel into the ladle in the current torpedo tank, there is a distance of more than ten meters between the operation room and the scene, and the scene of the dumping cannot be seen clearly because of the connection of the blocking, so it is necessary to show the scene through the display screen through the first line. At present, ordinary visible light cameras are used, because the dumping process is accompanied by strong light and smoke, and the dumping status of the molten steel cannot be seen clearly, which makes it difficult for the operator to operate, and also brings risks to the job site. A high-temperature camera is a great way to penetrate smoke and deal with glare from visible cameras on bright objects.