Large Blast Furnace Ultra-short Period Overhaul Technology
The large blast furnace is a large-scale and important equipment for the production of iron and steel in the industry. The life cycle of the large blast furnace is generally 20 to 30 years, and the survival time can reach 45 years. The ultra-short period is an important measure to extend the life of the large blast furnace and efficiently produce high-quality iron and steel products.
The ultra-short period overhaul of the large blast furnace uses advanced control technologies such as ultrasonic, laser measuring technology and 3D scanning to accurately measure and determine the wear and defect situation of the furnace shell and furnace volume of the furnace. It can accurately measure the high temperature of the furnace, the volume of the furnace, and the wear and deformation of the furnace wall and form the design for the overhaul of the large blast furnace. The technical parameters required for reconstruction.
According to the technical difficulties of large blast furnace Ultra-short Period Overhaul technology, first of all, it is necessary to accurately measure the size and wear and tear of the plastron and the volume of the furnace so as to determine the invisible wear and tear parts and possible technical parameters of the metal structure. Secondly, in the process of furnace volume measurement, the temperature inside the furnace is generally high and there is no water or electricity supply facilities in the furnace, so how to accurately pick up and measure the temperature in the furnace is an engineering problem.
The multiple factors of the large blast furnace ultra-short period overhaul technology are complex. Firstly, the parameters of the furnace structure should be accurately measured to determine the scope of repair and renovation. Secondly, the method of preheating the furnace walls must be taken into consideration so as to reduce the thermal stress inside the furnace caused by the temperature changes. Thirdly, the number of furnace wall repair patches should be minimized, the length of steel plates should be minimized, and the number of welding seams should be reduced.
In order to shorten the cycle of large blast furnace ultra-short period overhaul, a reasonable and effective technological process must be adopted. Firstly, the large and small measuring detectors should be used for the furnace shell and furnace volume of the furnace, and the safety precautions such as antistatic, protective earth and air pressure can be adopted in the detection field to ensure accuracy and safety.
Secondly, in the process of preheating the furnace wall and steel plate before the welding process, it is necessary to regularly monitor and timely adjust the preheating temperature of the furnace wall and steel plate in order to avoid the occurrence of various problems caused by the changes of temperature and the difference of thermal expansion coefficient. Again, accurately grasp the whole process of welding, accurately control the length of long materials, minimize the number of welding points, and improve the welding efficiency by effectively modifying the shape of the welded splicing plate.
Finally, the overhaul program should be adjusted in time to ensure the smooth progress of all processes. For large-scale and high-risk projects, it is necessary to analyze in advance and make corresponding solutions to some potential risks, so as to avoid the occurrence of serious accidents.
In short, the ultra-short period overhaul of large blast furnaces requires not only advanced techniques, but also requires all personnel to accurately understand the technology and have the ability to quickly respond to changes. Therefore, in addition to having a profound theoretical knowledge, each technical personnel should also be trained in practical training and practice. This can not only improve the accuracy of the technical processes, but also greatly reduce the maintenance and repair time, thereby improving the working efficiency and production quality of the large blast furnace to a large extent.
